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80d725d7 | 1 | /* Functions for generic Darwin as target machine for GNU C compiler. |
fbd26352 | 2 | Copyright (C) 1989-2019 Free Software Foundation, Inc. |
80d725d7 | 3 | Contributed by Apple Computer Inc. |
4 | ||
187b36cf | 5 | This file is part of GCC. |
80d725d7 | 6 | |
187b36cf | 7 | GCC is free software; you can redistribute it and/or modify |
80d725d7 | 8 | it under the terms of the GNU General Public License as published by |
038d1e19 | 9 | the Free Software Foundation; either version 3, or (at your option) |
80d725d7 | 10 | any later version. |
11 | ||
187b36cf | 12 | GCC is distributed in the hope that it will be useful, |
80d725d7 | 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
038d1e19 | 18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
80d725d7 | 20 | |
785790dc | 21 | #define IN_TARGET_CODE 1 |
22 | ||
80d725d7 | 23 | #include "config.h" |
24 | #include "system.h" | |
805e22b2 | 25 | #include "coretypes.h" |
9ef16211 | 26 | #include "backend.h" |
c1eb80de | 27 | #include "target.h" |
28 | #include "rtl.h" | |
9ef16211 | 29 | #include "tree.h" |
30 | #include "gimple.h" | |
c1eb80de | 31 | #include "cfghooks.h" |
9ef16211 | 32 | #include "df.h" |
ad7b10a2 | 33 | #include "memmodel.h" |
c1eb80de | 34 | #include "tm_p.h" |
35 | #include "stringpool.h" | |
30a86690 | 36 | #include "attribs.h" |
80d725d7 | 37 | #include "insn-config.h" |
c1eb80de | 38 | #include "emit-rtl.h" |
39 | #include "cgraph.h" | |
40 | #include "lto-streamer.h" | |
80d725d7 | 41 | #include "output.h" |
9ed99284 | 42 | #include "varasm.h" |
43 | #include "stor-layout.h" | |
d53441c8 | 44 | #include "explow.h" |
80d725d7 | 45 | #include "expr.h" |
d19bd1f0 | 46 | #include "langhooks.h" |
690abe5d | 47 | #include "toplev.h" |
47131315 | 48 | #include "lto-section-names.h" |
c1c6d679 | 49 | #include "intl.h" |
80d725d7 | 50 | |
f0ed0e8a | 51 | /* Darwin supports a feature called fix-and-continue, which is used |
52 | for rapid turn around debugging. When code is compiled with the | |
53 | -mfix-and-continue flag, two changes are made to the generated code | |
54 | that allow the system to do things that it would normally not be | |
55 | able to do easily. These changes allow gdb to load in | |
56 | recompilation of a translation unit that has been changed into a | |
57 | running program and replace existing functions and methods of that | |
cb4213cd | 58 | translation unit with versions of those functions and methods |
f0ed0e8a | 59 | from the newly compiled translation unit. The new functions access |
d188633a | 60 | the existing static symbols from the old translation unit, if the |
61 | symbol existed in the unit to be replaced, and from the new | |
62 | translation unit, otherwise. | |
f0ed0e8a | 63 | |
8063e558 | 64 | The changes are to insert 5 nops at the beginning of all functions |
d188633a | 65 | and to use indirection to get at static symbols. The 5 nops |
f0ed0e8a | 66 | are required by consumers of the generated code. Currently, gdb |
67 | uses this to patch in a jump to the overriding function, this | |
68 | allows all uses of the old name to forward to the replacement, | |
84cbcde5 | 69 | including existing function pointers and virtual methods. See |
f0ed0e8a | 70 | rs6000_emit_prologue for the code that handles the nop insertions. |
b215c058 | 71 | |
f0ed0e8a | 72 | The added indirection allows gdb to redirect accesses to static |
d188633a | 73 | symbols from the newly loaded translation unit to the existing |
74 | symbol, if any. @code{static} symbols are special and are handled by | |
75 | setting the second word in the .non_lazy_symbol_pointer data | |
76 | structure to symbol. See indirect_data for the code that handles | |
77 | the extra indirection, and machopic_output_indirection and its use | |
78 | of MACHO_SYMBOL_STATIC for the code that handles @code{static} | |
79 | symbol indirection. */ | |
f0ed0e8a | 80 | |
3cf7ab3b | 81 | /* For darwin >= 9 (OSX 10.5) the linker is capable of making the necessary |
82 | branch islands and we no longer need to emit darwin stubs. | |
83 | However, if we are generating code for earlier systems (or for use in the | |
84 | kernel) the stubs might still be required, and this will be set true. */ | |
85 | int darwin_emit_branch_islands = false; | |
86 | ||
ed161dab | 87 | typedef struct GTY(()) cdtor_record { |
4b313269 | 88 | rtx symbol; |
ed161dab | 89 | int priority; /* [con/de]structor priority */ |
4b313269 | 90 | int position; /* original position */ |
ed161dab | 91 | } cdtor_record; |
4b313269 | 92 | |
ed161dab | 93 | static GTY(()) vec<cdtor_record, va_gc> *ctors = NULL; |
94 | static GTY(()) vec<cdtor_record, va_gc> *dtors = NULL; | |
4b313269 | 95 | |
d4238e8b | 96 | /* A flag to determine whether we are running c++ or obj-c++. This has to be |
97 | settable from non-c-family contexts too (i.e. we can't use the c_dialect_ | |
98 | functions). */ | |
99 | int darwin_running_cxx; | |
100 | ||
9e09909d | 101 | /* Some code-gen now depends on OS major version numbers (at least). */ |
102 | int generating_for_darwin_version ; | |
103 | ||
f199808c | 104 | /* For older linkers we need to emit special sections (marked 'coalesced') for |
105 | for weak or single-definition items. */ | |
106 | static bool ld_uses_coal_sects = false; | |
107 | ||
92e4ba7d | 108 | /* Section names. */ |
109 | section * darwin_sections[NUM_DARWIN_SECTIONS]; | |
2f14b1f9 | 110 | |
90ff10b3 | 111 | /* While we transition to using in-tests instead of ifdef'd code. */ |
6cc3d6ec | 112 | #if !HAVE_lo_sum |
90ff10b3 | 113 | #define gen_macho_high(a,b) (a) |
114 | #define gen_macho_low(a,b,c) (a) | |
115 | #endif | |
116 | ||
f720b7c6 | 117 | /* True if we're setting __attribute__ ((ms_struct)). */ |
118 | int darwin_ms_struct = false; | |
119 | ||
8e79e9d4 | 120 | /* Earlier versions of Darwin as do not recognize an alignment field in |
121 | .comm directives, this should be set for versions that allow it. */ | |
122 | int emit_aligned_common = false; | |
123 | ||
2f14b1f9 | 124 | /* A get_unnamed_section callback used to switch to an ObjC section. |
125 | DIRECTIVE is as for output_section_asm_op. */ | |
126 | ||
127 | static void | |
128 | output_objc_section_asm_op (const void *directive) | |
129 | { | |
92e4ba7d | 130 | static bool been_here = false; |
2f14b1f9 | 131 | |
163c9fff | 132 | /* The NeXT ObjC Runtime requires these sections to be present and in |
133 | order in the object. The code below implements this by emitting | |
134 | a section header for each ObjC section the first time that an ObjC | |
135 | section is requested. */ | |
92e4ba7d | 136 | if (! been_here) |
2f14b1f9 | 137 | { |
c4796e8b | 138 | section *saved_in_section = in_section; |
b215c058 | 139 | static const enum darwin_section_enum tomark[] = |
92e4ba7d | 140 | { |
141 | /* written, cold -> hot */ | |
142 | objc_cat_cls_meth_section, | |
143 | objc_cat_inst_meth_section, | |
144 | objc_string_object_section, | |
145 | objc_constant_string_object_section, | |
146 | objc_selector_refs_section, | |
147 | objc_selector_fixup_section, | |
148 | objc_cls_refs_section, | |
149 | objc_class_section, | |
150 | objc_meta_class_section, | |
151 | /* shared, hot -> cold */ | |
152 | objc_cls_meth_section, | |
153 | objc_inst_meth_section, | |
154 | objc_protocol_section, | |
155 | objc_class_names_section, | |
156 | objc_meth_var_types_section, | |
157 | objc_meth_var_names_section, | |
158 | objc_category_section, | |
159 | objc_class_vars_section, | |
160 | objc_instance_vars_section, | |
161 | objc_module_info_section, | |
267785bc | 162 | objc_symbols_section, |
92e4ba7d | 163 | }; |
267785bc | 164 | /* ABI=1 */ |
165 | static const enum darwin_section_enum tomarkv1[] = | |
166 | { | |
167 | objc1_protocol_ext_section, | |
168 | objc1_class_ext_section, | |
169 | objc1_prop_list_section | |
170 | } ; | |
171 | /* ABI=2 */ | |
172 | static const enum darwin_section_enum tomarkv2[] = | |
173 | { | |
174 | objc2_message_refs_section, | |
175 | objc2_classdefs_section, | |
176 | objc2_metadata_section, | |
177 | objc2_classrefs_section, | |
178 | objc2_classlist_section, | |
179 | objc2_categorylist_section, | |
180 | objc2_selector_refs_section, | |
181 | objc2_nonlazy_class_section, | |
182 | objc2_nonlazy_category_section, | |
183 | objc2_protocollist_section, | |
184 | objc2_protocolrefs_section, | |
185 | objc2_super_classrefs_section, | |
186 | objc2_image_info_section, | |
187 | objc2_constant_string_object_section | |
188 | } ; | |
92e4ba7d | 189 | size_t i; |
b215c058 | 190 | |
92e4ba7d | 191 | been_here = true; |
267785bc | 192 | if (flag_objc_abi < 2) |
193 | { | |
194 | for (i = 0; i < ARRAY_SIZE (tomark); i++) | |
195 | switch_to_section (darwin_sections[tomark[i]]); | |
196 | if (flag_objc_abi == 1) | |
197 | for (i = 0; i < ARRAY_SIZE (tomarkv1); i++) | |
198 | switch_to_section (darwin_sections[tomarkv1[i]]); | |
199 | } | |
200 | else | |
201 | for (i = 0; i < ARRAY_SIZE (tomarkv2); i++) | |
202 | switch_to_section (darwin_sections[tomarkv2[i]]); | |
203 | /* Make sure we don't get varasm.c out of sync with us. */ | |
c4796e8b | 204 | switch_to_section (saved_in_section); |
2f14b1f9 | 205 | } |
206 | output_section_asm_op (directive); | |
207 | } | |
208 | ||
61aeb501 | 209 | |
210 | /* Private flag applied to disable section-anchors in a particular section. */ | |
211 | #define SECTION_NO_ANCHOR SECTION_MACH_DEP | |
212 | ||
213 | ||
2f14b1f9 | 214 | /* Implement TARGET_ASM_INIT_SECTIONS. */ |
215 | ||
216 | void | |
217 | darwin_init_sections (void) | |
218 | { | |
92e4ba7d | 219 | #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) \ |
220 | darwin_sections[NAME] = \ | |
221 | get_unnamed_section (FLAGS, (OBJC \ | |
222 | ? output_objc_section_asm_op \ | |
223 | : output_section_asm_op), \ | |
224 | "\t" DIRECTIVE); | |
225 | #include "config/darwin-sections.def" | |
2f14b1f9 | 226 | #undef DEF_SECTION |
227 | ||
92e4ba7d | 228 | readonly_data_section = darwin_sections[const_section]; |
229 | exception_section = darwin_sections[darwin_exception_section]; | |
230 | eh_frame_section = darwin_sections[darwin_eh_frame_section]; | |
f199808c | 231 | |
232 | /* If our linker is new enough to coalesce weak symbols, then we | |
233 | can just put picbase_thunks into the text section. */ | |
234 | if (! ld_uses_coal_sects ) | |
235 | darwin_sections[picbase_thunk_section] = text_section; | |
2f14b1f9 | 236 | } |
f0ed0e8a | 237 | |
80d725d7 | 238 | int |
b40da9a7 | 239 | name_needs_quotes (const char *name) |
80d725d7 | 240 | { |
241 | int c; | |
242 | while ((c = *name++) != '\0') | |
163c9fff | 243 | if (! ISIDNUM (c) |
244 | && c != '.' && c != '$' && c != '_' ) | |
80d725d7 | 245 | return 1; |
246 | return 0; | |
247 | } | |
248 | ||
866318b4 | 249 | /* Return true if SYM_REF can be used without an indirection. */ |
90ff10b3 | 250 | int |
ab06d2ff | 251 | machopic_symbol_defined_p (rtx sym_ref) |
80d725d7 | 252 | { |
866318b4 | 253 | if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED) |
254 | return true; | |
255 | ||
256 | /* If a symbol references local and is not an extern to this | |
257 | file, then the symbol might be able to declared as defined. */ | |
258 | if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref)) | |
259 | { | |
260 | /* If the symbol references a variable and the variable is a | |
261 | common symbol, then this symbol is not defined. */ | |
262 | if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE) | |
263 | { | |
264 | tree decl = SYMBOL_REF_DECL (sym_ref); | |
265 | if (!decl) | |
266 | return true; | |
267 | if (DECL_COMMON (decl)) | |
268 | return false; | |
269 | } | |
270 | return true; | |
271 | } | |
272 | return false; | |
80d725d7 | 273 | } |
274 | ||
ab06d2ff | 275 | /* This module assumes that (const (symbol_ref "foo")) is a legal pic |
276 | reference, which will not be changed. */ | |
b40da9a7 | 277 | |
80d725d7 | 278 | enum machopic_addr_class |
ab06d2ff | 279 | machopic_classify_symbol (rtx sym_ref) |
80d725d7 | 280 | { |
ab06d2ff | 281 | bool function_p; |
282 | ||
ab06d2ff | 283 | function_p = SYMBOL_REF_FUNCTION_P (sym_ref); |
284 | if (machopic_symbol_defined_p (sym_ref)) | |
b215c058 | 285 | return (function_p |
ab06d2ff | 286 | ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA); |
287 | else | |
b215c058 | 288 | return (function_p |
ab06d2ff | 289 | ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA); |
80d725d7 | 290 | } |
291 | ||
f0ed0e8a | 292 | #ifndef TARGET_FIX_AND_CONTINUE |
293 | #define TARGET_FIX_AND_CONTINUE 0 | |
294 | #endif | |
295 | ||
296 | /* Indicate when fix-and-continue style code generation is being used | |
297 | and when a reference to data should be indirected so that it can be | |
0975351b | 298 | rebound in a new translation unit to reference the original instance |
f0ed0e8a | 299 | of that data. Symbol names that are for code generation local to |
300 | the translation unit are bound to the new translation unit; | |
301 | currently this means symbols that begin with L or _OBJC_; | |
302 | otherwise, we indicate that an indirect reference should be made to | |
303 | permit the runtime to rebind new instances of the translation unit | |
304 | to the original instance of the data. */ | |
305 | ||
306 | static int | |
307 | indirect_data (rtx sym_ref) | |
308 | { | |
309 | int lprefix; | |
310 | const char *name; | |
311 | ||
c4f8e01f | 312 | /* If we aren't generating fix-and-continue code, don't do anything |
313 | special. */ | |
f0ed0e8a | 314 | if (TARGET_FIX_AND_CONTINUE == 0) |
315 | return 0; | |
316 | ||
317 | /* Otherwise, all symbol except symbols that begin with L or _OBJC_ | |
318 | are indirected. Symbols that begin with L and _OBJC_ are always | |
319 | bound to the current translation unit as they are used for | |
320 | generated local data of the translation unit. */ | |
321 | ||
322 | name = XSTR (sym_ref, 0); | |
323 | ||
324 | lprefix = (((name[0] == '*' || name[0] == '&') | |
325 | && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L'))) | |
78a79402 | 326 | || (strncmp (name, "_OBJC_", 6) == 0)); |
f0ed0e8a | 327 | |
328 | return ! lprefix; | |
329 | } | |
330 | ||
80d725d7 | 331 | static int |
ab06d2ff | 332 | machopic_data_defined_p (rtx sym_ref) |
80d725d7 | 333 | { |
f0ed0e8a | 334 | if (indirect_data (sym_ref)) |
335 | return 0; | |
336 | ||
ab06d2ff | 337 | switch (machopic_classify_symbol (sym_ref)) |
80d725d7 | 338 | { |
339 | case MACHOPIC_DEFINED_DATA: | |
3a7ccce8 | 340 | case MACHOPIC_DEFINED_FUNCTION: |
80d725d7 | 341 | return 1; |
342 | default: | |
343 | return 0; | |
344 | } | |
345 | } | |
346 | ||
80d725d7 | 347 | void |
ab06d2ff | 348 | machopic_define_symbol (rtx mem) |
80d725d7 | 349 | { |
ab06d2ff | 350 | rtx sym_ref; |
b215c058 | 351 | |
27d2baef | 352 | gcc_assert (GET_CODE (mem) == MEM); |
ab06d2ff | 353 | sym_ref = XEXP (mem, 0); |
354 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED; | |
80d725d7 | 355 | } |
356 | ||
a914e728 | 357 | /* Return either ORIG or: |
80d725d7 | 358 | |
a914e728 | 359 | (const:P (unspec:P [ORIG] UNSPEC_MACHOPIC_OFFSET)) |
ab06d2ff | 360 | |
a914e728 | 361 | depending on MACHO_DYNAMIC_NO_PIC_P. */ |
ab06d2ff | 362 | rtx |
a914e728 | 363 | machopic_gen_offset (rtx orig) |
ab06d2ff | 364 | { |
a914e728 | 365 | if (MACHO_DYNAMIC_NO_PIC_P) |
b06a3cc3 | 366 | return orig; |
367 | else | |
a914e728 | 368 | { |
369 | /* Play games to avoid marking the function as needing pic if we | |
370 | are being called as part of the cost-estimation process. */ | |
e5d1687d | 371 | if (current_ir_type () != IR_GIMPLE || currently_expanding_to_rtl) |
a914e728 | 372 | crtl->uses_pic_offset_table = 1; |
373 | orig = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, orig), | |
374 | UNSPEC_MACHOPIC_OFFSET); | |
375 | return gen_rtx_CONST (Pmode, orig); | |
376 | } | |
b06a3cc3 | 377 | } |
378 | ||
b186bdc9 | 379 | static GTY(()) const char * function_base_func_name; |
380 | static GTY(()) int current_pic_label_num; | |
f212a7d0 | 381 | static GTY(()) int emitted_pic_label_num; |
b186bdc9 | 382 | |
f212a7d0 | 383 | static void |
384 | update_pic_label_number_if_needed (void) | |
b186bdc9 | 385 | { |
386 | const char *current_name; | |
387 | ||
90ff10b3 | 388 | /* When we are generating _get_pc thunks within stubs, there is no current |
389 | function. */ | |
390 | if (current_function_decl) | |
391 | { | |
392 | current_name = | |
393 | IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl)); | |
394 | if (function_base_func_name != current_name) | |
395 | { | |
396 | ++current_pic_label_num; | |
397 | function_base_func_name = current_name; | |
398 | } | |
399 | } | |
400 | else | |
80d725d7 | 401 | { |
80d725d7 | 402 | ++current_pic_label_num; |
90ff10b3 | 403 | function_base_func_name = "L_machopic_stub_dummy"; |
80d725d7 | 404 | } |
f212a7d0 | 405 | } |
406 | ||
407 | void | |
408 | machopic_output_function_base_name (FILE *file) | |
409 | { | |
410 | /* If dynamic-no-pic is on, we should not get here. */ | |
411 | gcc_assert (!MACHO_DYNAMIC_NO_PIC_P); | |
412 | ||
413 | update_pic_label_number_if_needed (); | |
414 | fprintf (file, "L%d$pb", current_pic_label_num); | |
415 | } | |
416 | ||
4e2e3c2e | 417 | char curr_picbasename[32]; |
418 | ||
419 | const char * | |
420 | machopic_get_function_picbase (void) | |
421 | { | |
422 | /* If dynamic-no-pic is on, we should not get here. */ | |
423 | gcc_assert (!MACHO_DYNAMIC_NO_PIC_P); | |
424 | ||
425 | update_pic_label_number_if_needed (); | |
426 | snprintf (curr_picbasename, 32, "L%d$pb", current_pic_label_num); | |
427 | return (const char *) curr_picbasename; | |
428 | } | |
429 | ||
f212a7d0 | 430 | bool |
431 | machopic_should_output_picbase_label (void) | |
432 | { | |
433 | update_pic_label_number_if_needed (); | |
434 | ||
435 | if (current_pic_label_num == emitted_pic_label_num) | |
436 | return false; | |
437 | ||
438 | emitted_pic_label_num = current_pic_label_num; | |
439 | return true; | |
80d725d7 | 440 | } |
441 | ||
ab06d2ff | 442 | /* The suffix attached to non-lazy pointer symbols. */ |
443 | #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr" | |
444 | /* The suffix attached to stub symbols. */ | |
445 | #define STUB_SUFFIX "$stub" | |
80d725d7 | 446 | |
2ef51f0e | 447 | typedef struct GTY ((for_user)) machopic_indirection |
80d725d7 | 448 | { |
ab06d2ff | 449 | /* The SYMBOL_REF for the entity referenced. */ |
450 | rtx symbol; | |
6d3abfc0 | 451 | /* The name of the stub or non-lazy pointer. */ |
452 | const char * ptr_name; | |
ab06d2ff | 453 | /* True iff this entry is for a stub (as opposed to a non-lazy |
454 | pointer). */ | |
455 | bool stub_p; | |
47ae02b7 | 456 | /* True iff this stub or pointer has been referenced. */ |
ab06d2ff | 457 | bool used; |
458 | } machopic_indirection; | |
459 | ||
b594087e | 460 | struct indirection_hasher : ggc_ptr_hash<machopic_indirection> |
2ef51f0e | 461 | { |
462 | typedef const char *compare_type; | |
463 | static hashval_t hash (machopic_indirection *); | |
464 | static bool equal (machopic_indirection *, const char *); | |
465 | }; | |
466 | ||
ab06d2ff | 467 | /* A table mapping stub names and non-lazy pointer names to |
468 | SYMBOL_REFs for the stubbed-to and pointed-to entities. */ | |
469 | ||
2ef51f0e | 470 | static GTY (()) hash_table<indirection_hasher> *machopic_indirections; |
ab06d2ff | 471 | |
472 | /* Return a hash value for a SLOT in the indirections hash table. */ | |
473 | ||
2ef51f0e | 474 | hashval_t |
475 | indirection_hasher::hash (machopic_indirection *p) | |
ab06d2ff | 476 | { |
6d3abfc0 | 477 | return htab_hash_string (p->ptr_name); |
ab06d2ff | 478 | } |
b40da9a7 | 479 | |
ab06d2ff | 480 | /* Returns true if the KEY is the same as that associated with |
481 | SLOT. */ | |
482 | ||
2ef51f0e | 483 | bool |
484 | indirection_hasher::equal (machopic_indirection *s, const char *k) | |
ab06d2ff | 485 | { |
2ef51f0e | 486 | return strcmp (s->ptr_name, k) == 0; |
ab06d2ff | 487 | } |
80d725d7 | 488 | |
ab06d2ff | 489 | /* Return the name of the non-lazy pointer (if STUB_P is false) or |
4f3ac3c8 | 490 | stub (if STUB_B is true) corresponding to the given name. |
491 | ||
492 | If we have a situation like: | |
493 | ||
494 | global_weak_symbol: | |
495 | .... | |
496 | Lnon_weak_local: | |
497 | .... | |
498 | ||
499 | ld64 will be unable to split this into two atoms (because the "L" makes | |
500 | the second symbol 'invisible'). This means that legitimate direct accesses | |
501 | to the second symbol will appear to be non-allowed direct accesses to an | |
502 | atom of type weak, global which are not allowed. | |
503 | ||
504 | To avoid this, we make the indirections have a leading 'l' (lower-case L) | |
505 | which has a special meaning: linker can see this and use it to determine | |
506 | atoms, but it is not placed into the final symbol table. | |
507 | ||
508 | The implementation here is somewhat heavy-handed in that it will also mark | |
509 | indirections to the __IMPORT,__pointers section the same way which is | |
510 | really unnecessary, since ld64 _can_ split those into atoms as they are | |
511 | fixed size. FIXME: determine if this is a penalty worth extra code to | |
512 | fix. | |
513 | ||
514 | */ | |
8dfaa51b | 515 | |
ab06d2ff | 516 | const char * |
517 | machopic_indirection_name (rtx sym_ref, bool stub_p) | |
518 | { | |
519 | char *buffer; | |
520 | const char *name = XSTR (sym_ref, 0); | |
6d3abfc0 | 521 | size_t namelen = strlen (name); |
ab06d2ff | 522 | machopic_indirection *p; |
524eafbc | 523 | bool needs_quotes; |
524 | const char *suffix; | |
4f3ac3c8 | 525 | char L_or_l = 'L'; |
524eafbc | 526 | const char *prefix = user_label_prefix; |
527 | const char *quote = ""; | |
b359164b | 528 | tree id; |
529 | ||
530 | id = maybe_get_identifier (name); | |
531 | if (id) | |
532 | { | |
533 | tree id_orig = id; | |
534 | ||
535 | while (IDENTIFIER_TRANSPARENT_ALIAS (id)) | |
536 | id = TREE_CHAIN (id); | |
537 | if (id != id_orig) | |
538 | { | |
539 | name = IDENTIFIER_POINTER (id); | |
540 | namelen = strlen (name); | |
541 | } | |
542 | } | |
b215c058 | 543 | |
524eafbc | 544 | if (name[0] == '*') |
8dfaa51b | 545 | { |
524eafbc | 546 | prefix = ""; |
547 | ++name; | |
548 | --namelen; | |
ab06d2ff | 549 | } |
524eafbc | 550 | |
551 | needs_quotes = name_needs_quotes (name); | |
552 | if (needs_quotes) | |
ab06d2ff | 553 | { |
524eafbc | 554 | quote = "\""; |
8dfaa51b | 555 | } |
556 | ||
524eafbc | 557 | if (stub_p) |
558 | suffix = STUB_SUFFIX; | |
559 | else | |
4f3ac3c8 | 560 | { |
561 | suffix = NON_LAZY_POINTER_SUFFIX; | |
562 | /* Let the linker see this. */ | |
563 | L_or_l = 'l'; | |
564 | } | |
524eafbc | 565 | |
4f3ac3c8 | 566 | buffer = XALLOCAVEC (char, 2 /* strlen ("&L") or ("&l") */ |
524eafbc | 567 | + strlen (prefix) |
568 | + namelen | |
569 | + strlen (suffix) | |
570 | + 2 * strlen (quote) | |
571 | + 1 /* '\0' */); | |
572 | ||
573 | /* Construct the name of the non-lazy pointer or stub. */ | |
4f3ac3c8 | 574 | sprintf (buffer, "&%s%c%s%s%s%s", quote, L_or_l, prefix, name, suffix, quote); |
524eafbc | 575 | |
6d3abfc0 | 576 | if (!machopic_indirections) |
2ef51f0e | 577 | machopic_indirections = hash_table<indirection_hasher>::create_ggc (37); |
b215c058 | 578 | |
2ef51f0e | 579 | machopic_indirection **slot |
580 | = machopic_indirections->find_slot_with_hash (buffer, | |
581 | htab_hash_string (buffer), | |
582 | INSERT); | |
6d3abfc0 | 583 | if (*slot) |
584 | { | |
2ef51f0e | 585 | p = *slot; |
6d3abfc0 | 586 | } |
587 | else | |
ab06d2ff | 588 | { |
25a27413 | 589 | p = ggc_alloc<machopic_indirection> (); |
ab06d2ff | 590 | p->symbol = sym_ref; |
6d3abfc0 | 591 | p->ptr_name = xstrdup (buffer); |
ab06d2ff | 592 | p->stub_p = stub_p; |
6d3abfc0 | 593 | p->used = false; |
594 | *slot = p; | |
ab06d2ff | 595 | } |
b215c058 | 596 | |
6d3abfc0 | 597 | return p->ptr_name; |
80d725d7 | 598 | } |
599 | ||
ab06d2ff | 600 | /* Return the name of the stub for the mcount function. */ |
80d725d7 | 601 | |
ab06d2ff | 602 | const char* |
603 | machopic_mcount_stub_name (void) | |
80d725d7 | 604 | { |
620dd87a | 605 | rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount"); |
606 | return machopic_indirection_name (symbol, /*stub_p=*/true); | |
80d725d7 | 607 | } |
608 | ||
ab06d2ff | 609 | /* If NAME is the name of a stub or a non-lazy pointer , mark the stub |
610 | or non-lazy pointer as used -- and mark the object to which the | |
611 | pointer/stub refers as used as well, since the pointer/stub will | |
612 | emit a reference to it. */ | |
613 | ||
80d725d7 | 614 | void |
ab06d2ff | 615 | machopic_validate_stub_or_non_lazy_ptr (const char *name) |
80d725d7 | 616 | { |
2ef51f0e | 617 | machopic_indirection *p |
618 | = machopic_indirections->find_with_hash (name, htab_hash_string (name)); | |
6d3abfc0 | 619 | if (p && ! p->used) |
ab06d2ff | 620 | { |
6d3abfc0 | 621 | const char *real_name; |
622 | tree id; | |
b215c058 | 623 | |
6d3abfc0 | 624 | p->used = true; |
625 | ||
09e39ca0 | 626 | /* Do what output_addr_const will do when we actually call it. */ |
627 | if (SYMBOL_REF_DECL (p->symbol)) | |
628 | mark_decl_referenced (SYMBOL_REF_DECL (p->symbol)); | |
629 | ||
630 | real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0)); | |
b215c058 | 631 | |
6d3abfc0 | 632 | id = maybe_get_identifier (real_name); |
633 | if (id) | |
634 | mark_referenced (id); | |
ab06d2ff | 635 | } |
80d725d7 | 636 | } |
637 | ||
638 | /* Transform ORIG, which may be any data source, to the corresponding | |
639 | source using indirections. */ | |
640 | ||
641 | rtx | |
b40da9a7 | 642 | machopic_indirect_data_reference (rtx orig, rtx reg) |
80d725d7 | 643 | { |
644 | rtx ptr_ref = orig; | |
b40da9a7 | 645 | |
80d725d7 | 646 | if (! MACHOPIC_INDIRECT) |
647 | return orig; | |
648 | ||
649 | if (GET_CODE (orig) == SYMBOL_REF) | |
650 | { | |
ab06d2ff | 651 | int defined = machopic_data_defined_p (orig); |
8f74ae7b | 652 | |
653 | if (defined && MACHO_DYNAMIC_NO_PIC_P) | |
654 | { | |
90ff10b3 | 655 | if (DARWIN_PPC) |
656 | { | |
fed0a860 | 657 | /* Create a new register for CSE opportunities. */ |
e1ba4a27 | 658 | rtx hi_reg = (!can_create_pseudo_p () ? reg : gen_reg_rtx (Pmode)); |
fed0a860 | 659 | emit_insn (gen_macho_high (hi_reg, orig)); |
660 | emit_insn (gen_macho_low (reg, hi_reg, orig)); | |
90ff10b3 | 661 | return reg; |
662 | } | |
663 | else if (DARWIN_X86) | |
664 | return orig; | |
665 | else | |
8f74ae7b | 666 | /* some other cpu -- writeme! */ |
27d2baef | 667 | gcc_unreachable (); |
8f74ae7b | 668 | } |
669 | else if (defined) | |
80d725d7 | 670 | { |
90ff10b3 | 671 | rtx offset = NULL; |
672 | if (DARWIN_PPC || HAVE_lo_sum) | |
673 | offset = machopic_gen_offset (orig); | |
80d725d7 | 674 | |
90ff10b3 | 675 | if (DARWIN_PPC) |
676 | { | |
e1ba4a27 | 677 | rtx hi_sum_reg = (!can_create_pseudo_p () |
678 | ? reg | |
679 | : gen_reg_rtx (Pmode)); | |
80d725d7 | 680 | |
27d2baef | 681 | gcc_assert (reg); |
80d725d7 | 682 | |
d1f9b275 | 683 | emit_insn (gen_rtx_SET (hi_sum_reg, |
37ec5024 | 684 | gen_rtx_PLUS (Pmode, pic_offset_table_rtx, |
685 | gen_rtx_HIGH (Pmode, offset)))); | |
d1f9b275 | 686 | emit_insn (gen_rtx_SET (reg, |
3b4a645f | 687 | gen_rtx_LO_SUM (Pmode, hi_sum_reg, |
688 | copy_rtx (offset)))); | |
80d725d7 | 689 | |
690 | orig = reg; | |
90ff10b3 | 691 | } |
692 | else if (HAVE_lo_sum) | |
693 | { | |
27d2baef | 694 | gcc_assert (reg); |
80d725d7 | 695 | |
d1f9b275 | 696 | emit_insn (gen_rtx_SET (reg, gen_rtx_HIGH (Pmode, offset))); |
697 | emit_insn (gen_rtx_SET (reg, gen_rtx_LO_SUM (Pmode, reg, | |
698 | copy_rtx (offset)))); | |
18b42941 | 699 | emit_use (pic_offset_table_rtx); |
80d725d7 | 700 | |
37ec5024 | 701 | orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg); |
90ff10b3 | 702 | } |
80d725d7 | 703 | return orig; |
704 | } | |
705 | ||
329f67ae | 706 | ptr_ref = (gen_rtx_SYMBOL_REF |
b215c058 | 707 | (Pmode, |
ab06d2ff | 708 | machopic_indirection_name (orig, /*stub_p=*/false))); |
80d725d7 | 709 | |
7c266bb1 | 710 | SYMBOL_REF_DATA (ptr_ref) = SYMBOL_REF_DATA (orig); |
f9226418 | 711 | |
e265a6da | 712 | ptr_ref = gen_const_mem (Pmode, ptr_ref); |
329f67ae | 713 | machopic_define_symbol (ptr_ref); |
80d725d7 | 714 | |
90ff10b3 | 715 | if (DARWIN_X86 |
716 | && reg | |
717 | && MACHO_DYNAMIC_NO_PIC_P) | |
718 | { | |
d1f9b275 | 719 | emit_insn (gen_rtx_SET (reg, ptr_ref)); |
90ff10b3 | 720 | ptr_ref = reg; |
721 | } | |
722 | ||
80d725d7 | 723 | return ptr_ref; |
724 | } | |
725 | else if (GET_CODE (orig) == CONST) | |
726 | { | |
90ff10b3 | 727 | /* If "(const (plus ...", walk the PLUS and return that result. |
728 | PLUS processing (below) will restore the "(const ..." if | |
729 | appropriate. */ | |
80d725d7 | 730 | if (GET_CODE (XEXP (orig, 0)) == PLUS) |
90ff10b3 | 731 | return machopic_indirect_data_reference (XEXP (orig, 0), reg); |
732 | else | |
733 | return orig; | |
734 | } | |
735 | else if (GET_CODE (orig) == MEM) | |
736 | { | |
737 | XEXP (ptr_ref, 0) = | |
738 | machopic_indirect_data_reference (XEXP (orig, 0), reg); | |
739 | return ptr_ref; | |
740 | } | |
741 | else if (GET_CODE (orig) == PLUS) | |
742 | { | |
743 | rtx base, result; | |
744 | /* When the target is i386, this code prevents crashes due to the | |
745 | compiler's ignorance on how to move the PIC base register to | |
746 | other registers. (The reload phase sometimes introduces such | |
747 | insns.) */ | |
748 | if (GET_CODE (XEXP (orig, 0)) == REG | |
749 | && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM | |
750 | /* Prevent the same register from being erroneously used | |
751 | as both the base and index registers. */ | |
752 | && (DARWIN_X86 && (GET_CODE (XEXP (orig, 1)) == CONST)) | |
753 | && reg) | |
80d725d7 | 754 | { |
90ff10b3 | 755 | emit_move_insn (reg, XEXP (orig, 0)); |
756 | XEXP (ptr_ref, 0) = reg; | |
757 | return ptr_ref; | |
80d725d7 | 758 | } |
80d725d7 | 759 | |
90ff10b3 | 760 | /* Legitimize both operands of the PLUS. */ |
761 | base = machopic_indirect_data_reference (XEXP (orig, 0), reg); | |
762 | orig = machopic_indirect_data_reference (XEXP (orig, 1), | |
763 | (base == reg ? 0 : reg)); | |
764 | if (MACHOPIC_INDIRECT && (GET_CODE (orig) == CONST_INT)) | |
29c05e22 | 765 | result = plus_constant (Pmode, base, INTVAL (orig)); |
80d725d7 | 766 | else |
37ec5024 | 767 | result = gen_rtx_PLUS (Pmode, base, orig); |
80d725d7 | 768 | |
80d725d7 | 769 | if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM) |
770 | { | |
771 | if (reg) | |
772 | { | |
773 | emit_move_insn (reg, result); | |
774 | result = reg; | |
775 | } | |
776 | else | |
777 | { | |
778 | result = force_reg (GET_MODE (result), result); | |
779 | } | |
780 | } | |
781 | ||
782 | return result; | |
80d725d7 | 783 | } |
784 | return ptr_ref; | |
785 | } | |
786 | ||
80d725d7 | 787 | /* Transform TARGET (a MEM), which is a function call target, to the |
788 | corresponding symbol_stub if necessary. Return a new MEM. */ | |
789 | ||
790 | rtx | |
b40da9a7 | 791 | machopic_indirect_call_target (rtx target) |
80d725d7 | 792 | { |
3cf7ab3b | 793 | if (! darwin_emit_branch_islands) |
794 | return target; | |
795 | ||
80d725d7 | 796 | if (GET_CODE (target) != MEM) |
797 | return target; | |
798 | ||
b215c058 | 799 | if (MACHOPIC_INDIRECT |
ab06d2ff | 800 | && GET_CODE (XEXP (target, 0)) == SYMBOL_REF |
801 | && !(SYMBOL_REF_FLAGS (XEXP (target, 0)) | |
802 | & MACHO_SYMBOL_FLAG_DEFINED)) | |
b40da9a7 | 803 | { |
ab06d2ff | 804 | rtx sym_ref = XEXP (target, 0); |
b215c058 | 805 | const char *stub_name = machopic_indirection_name (sym_ref, |
ab06d2ff | 806 | /*stub_p=*/true); |
3754d046 | 807 | machine_mode mode = GET_MODE (sym_ref); |
b215c058 | 808 | |
ab06d2ff | 809 | XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name); |
7c266bb1 | 810 | SYMBOL_REF_DATA (XEXP (target, 0)) = SYMBOL_REF_DATA (sym_ref); |
b04fab2a | 811 | MEM_READONLY_P (target) = 1; |
e265a6da | 812 | MEM_NOTRAP_P (target) = 1; |
80d725d7 | 813 | } |
814 | ||
815 | return target; | |
816 | } | |
817 | ||
818 | rtx | |
3754d046 | 819 | machopic_legitimize_pic_address (rtx orig, machine_mode mode, rtx reg) |
80d725d7 | 820 | { |
821 | rtx pic_ref = orig; | |
822 | ||
8f74ae7b | 823 | if (! MACHOPIC_INDIRECT) |
80d725d7 | 824 | return orig; |
825 | ||
826 | /* First handle a simple SYMBOL_REF or LABEL_REF */ | |
827 | if (GET_CODE (orig) == LABEL_REF | |
2c568282 | 828 | || GET_CODE (orig) == SYMBOL_REF) |
80d725d7 | 829 | { |
830 | /* addr(foo) = &func+(foo-func) */ | |
80d725d7 | 831 | orig = machopic_indirect_data_reference (orig, reg); |
832 | ||
b40da9a7 | 833 | if (GET_CODE (orig) == PLUS |
80d725d7 | 834 | && GET_CODE (XEXP (orig, 0)) == REG) |
835 | { | |
836 | if (reg == 0) | |
837 | return force_reg (mode, orig); | |
838 | ||
839 | emit_move_insn (reg, orig); | |
840 | return reg; | |
b40da9a7 | 841 | } |
80d725d7 | 842 | |
80d725d7 | 843 | if (GET_CODE (orig) == MEM) |
844 | { | |
845 | if (reg == 0) | |
846 | { | |
27d2baef | 847 | gcc_assert (!reload_in_progress); |
848 | reg = gen_reg_rtx (Pmode); | |
80d725d7 | 849 | } |
b40da9a7 | 850 | |
90ff10b3 | 851 | #if HAVE_lo_sum |
8f74ae7b | 852 | if (MACHO_DYNAMIC_NO_PIC_P |
853 | && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF | |
854 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF)) | |
855 | { | |
856 | #if defined (TARGET_TOC) /* ppc */ | |
e1ba4a27 | 857 | rtx temp_reg = (!can_create_pseudo_p () |
858 | ? reg : | |
859 | gen_reg_rtx (Pmode)); | |
8f74ae7b | 860 | rtx asym = XEXP (orig, 0); |
861 | rtx mem; | |
862 | ||
301a5e52 | 863 | emit_insn (gen_macho_high (temp_reg, asym)); |
e265a6da | 864 | mem = gen_const_mem (GET_MODE (orig), |
3b4a645f | 865 | gen_rtx_LO_SUM (Pmode, temp_reg, |
866 | copy_rtx (asym))); | |
d1f9b275 | 867 | emit_insn (gen_rtx_SET (reg, mem)); |
8f74ae7b | 868 | #else |
c4f8e01f | 869 | /* Some other CPU -- WriteMe! but right now there are no other |
870 | platforms that can use dynamic-no-pic */ | |
27d2baef | 871 | gcc_unreachable (); |
8f74ae7b | 872 | #endif |
873 | pic_ref = reg; | |
874 | } | |
875 | else | |
b40da9a7 | 876 | if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF |
80d725d7 | 877 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF) |
878 | { | |
a914e728 | 879 | rtx offset = machopic_gen_offset (XEXP (orig, 0)); |
80d725d7 | 880 | #if defined (TARGET_TOC) /* i.e., PowerPC */ |
881 | /* Generating a new reg may expose opportunities for | |
882 | common subexpression elimination. */ | |
e1ba4a27 | 883 | rtx hi_sum_reg = (!can_create_pseudo_p () |
884 | ? reg | |
885 | : gen_reg_rtx (Pmode)); | |
37ec5024 | 886 | rtx mem; |
37ec5024 | 887 | rtx sum; |
b215c058 | 888 | |
37ec5024 | 889 | sum = gen_rtx_HIGH (Pmode, offset); |
890 | if (! MACHO_DYNAMIC_NO_PIC_P) | |
891 | sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum); | |
80d725d7 | 892 | |
d1f9b275 | 893 | emit_insn (gen_rtx_SET (hi_sum_reg, sum)); |
37ec5024 | 894 | |
e265a6da | 895 | mem = gen_const_mem (GET_MODE (orig), |
b215c058 | 896 | gen_rtx_LO_SUM (Pmode, |
3b4a645f | 897 | hi_sum_reg, |
898 | copy_rtx (offset))); | |
26cd1198 | 899 | rtx_insn *insn = emit_insn (gen_rtx_SET (reg, mem)); |
24153880 | 900 | set_unique_reg_note (insn, REG_EQUAL, pic_ref); |
37ec5024 | 901 | |
902 | pic_ref = reg; | |
80d725d7 | 903 | #else |
18b42941 | 904 | emit_use (gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM)); |
37ec5024 | 905 | |
d1f9b275 | 906 | emit_insn (gen_rtx_SET (reg, |
37ec5024 | 907 | gen_rtx_HIGH (Pmode, |
b215c058 | 908 | gen_rtx_CONST (Pmode, |
37ec5024 | 909 | offset)))); |
d1f9b275 | 910 | emit_insn (gen_rtx_SET (reg, |
37ec5024 | 911 | gen_rtx_LO_SUM (Pmode, reg, |
3b4a645f | 912 | gen_rtx_CONST (Pmode, |
913 | copy_rtx (offset))))); | |
37ec5024 | 914 | pic_ref = gen_rtx_PLUS (Pmode, |
915 | pic_offset_table_rtx, reg); | |
80d725d7 | 916 | #endif |
917 | } | |
918 | else | |
919 | #endif /* HAVE_lo_sum */ | |
920 | { | |
921 | rtx pic = pic_offset_table_rtx; | |
922 | if (GET_CODE (pic) != REG) | |
923 | { | |
924 | emit_move_insn (reg, pic); | |
925 | pic = reg; | |
926 | } | |
927 | #if 0 | |
18b42941 | 928 | emit_use (gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM)); |
80d725d7 | 929 | #endif |
930 | ||
3e111a71 | 931 | if (reload_in_progress) |
3072d30e | 932 | df_set_regs_ever_live (REGNO (pic), true); |
b06a3cc3 | 933 | pic_ref = gen_rtx_PLUS (Pmode, pic, |
a914e728 | 934 | machopic_gen_offset (XEXP (orig, 0))); |
80d725d7 | 935 | } |
b40da9a7 | 936 | |
80d725d7 | 937 | #if !defined (TARGET_TOC) |
80d725d7 | 938 | emit_move_insn (reg, pic_ref); |
e265a6da | 939 | pic_ref = gen_const_mem (GET_MODE (orig), reg); |
7ba97778 | 940 | #endif |
80d725d7 | 941 | } |
942 | else | |
943 | { | |
944 | ||
90ff10b3 | 945 | #if HAVE_lo_sum |
b40da9a7 | 946 | if (GET_CODE (orig) == SYMBOL_REF |
80d725d7 | 947 | || GET_CODE (orig) == LABEL_REF) |
948 | { | |
a914e728 | 949 | rtx offset = machopic_gen_offset (orig); |
80d725d7 | 950 | #if defined (TARGET_TOC) /* i.e., PowerPC */ |
951 | rtx hi_sum_reg; | |
952 | ||
953 | if (reg == 0) | |
954 | { | |
27d2baef | 955 | gcc_assert (!reload_in_progress); |
956 | reg = gen_reg_rtx (Pmode); | |
80d725d7 | 957 | } |
b40da9a7 | 958 | |
80d725d7 | 959 | hi_sum_reg = reg; |
960 | ||
d1f9b275 | 961 | emit_insn (gen_rtx_SET (hi_sum_reg, |
37ec5024 | 962 | (MACHO_DYNAMIC_NO_PIC_P) |
963 | ? gen_rtx_HIGH (Pmode, offset) | |
964 | : gen_rtx_PLUS (Pmode, | |
965 | pic_offset_table_rtx, | |
b215c058 | 966 | gen_rtx_HIGH (Pmode, |
37ec5024 | 967 | offset)))); |
d1f9b275 | 968 | emit_insn (gen_rtx_SET (reg, |
37ec5024 | 969 | gen_rtx_LO_SUM (Pmode, |
3b4a645f | 970 | hi_sum_reg, |
971 | copy_rtx (offset)))); | |
80d725d7 | 972 | pic_ref = reg; |
973 | #else | |
d1f9b275 | 974 | emit_insn (gen_rtx_SET (reg, gen_rtx_HIGH (Pmode, offset))); |
975 | emit_insn (gen_rtx_SET (reg, | |
3b4a645f | 976 | gen_rtx_LO_SUM (Pmode, reg, |
977 | copy_rtx (offset)))); | |
37ec5024 | 978 | pic_ref = gen_rtx_PLUS (Pmode, |
979 | pic_offset_table_rtx, reg); | |
80d725d7 | 980 | #endif |
981 | } | |
982 | else | |
983 | #endif /* HAVE_lo_sum */ | |
984 | { | |
7a5893fc | 985 | if (REG_P (orig) |
986 | || GET_CODE (orig) == SUBREG) | |
80d725d7 | 987 | { |
988 | return orig; | |
989 | } | |
990 | else | |
991 | { | |
992 | rtx pic = pic_offset_table_rtx; | |
993 | if (GET_CODE (pic) != REG) | |
994 | { | |
995 | emit_move_insn (reg, pic); | |
996 | pic = reg; | |
997 | } | |
998 | #if 0 | |
18b42941 | 999 | emit_use (pic_offset_table_rtx); |
80d725d7 | 1000 | #endif |
3e111a71 | 1001 | if (reload_in_progress) |
3072d30e | 1002 | df_set_regs_ever_live (REGNO (pic), true); |
37ec5024 | 1003 | pic_ref = gen_rtx_PLUS (Pmode, |
1004 | pic, | |
a914e728 | 1005 | machopic_gen_offset (orig)); |
80d725d7 | 1006 | } |
1007 | } | |
1008 | } | |
1009 | ||
80d725d7 | 1010 | if (GET_CODE (pic_ref) != REG) |
1011 | { | |
1012 | if (reg != 0) | |
1013 | { | |
1014 | emit_move_insn (reg, pic_ref); | |
1015 | return reg; | |
1016 | } | |
1017 | else | |
1018 | { | |
1019 | return force_reg (mode, pic_ref); | |
1020 | } | |
1021 | } | |
1022 | else | |
1023 | { | |
1024 | return pic_ref; | |
1025 | } | |
1026 | } | |
80d725d7 | 1027 | else if (GET_CODE (orig) == PLUS |
1028 | && (GET_CODE (XEXP (orig, 0)) == MEM | |
1029 | || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF | |
1030 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF) | |
1031 | && XEXP (orig, 0) != pic_offset_table_rtx | |
1032 | && GET_CODE (XEXP (orig, 1)) != REG) | |
b40da9a7 | 1033 | |
80d725d7 | 1034 | { |
1035 | rtx base; | |
1036 | int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM); | |
1037 | ||
1038 | base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
1039 | orig = machopic_legitimize_pic_address (XEXP (orig, 1), | |
1040 | Pmode, (base == reg ? 0 : reg)); | |
1041 | if (GET_CODE (orig) == CONST_INT) | |
1042 | { | |
29c05e22 | 1043 | pic_ref = plus_constant (Pmode, base, INTVAL (orig)); |
80d725d7 | 1044 | is_complex = 1; |
1045 | } | |
1046 | else | |
37ec5024 | 1047 | pic_ref = gen_rtx_PLUS (Pmode, base, orig); |
80d725d7 | 1048 | |
80d725d7 | 1049 | if (reg && is_complex) |
1050 | { | |
1051 | emit_move_insn (reg, pic_ref); | |
1052 | pic_ref = reg; | |
1053 | } | |
1054 | /* Likewise, should we set special REG_NOTEs here? */ | |
1055 | } | |
80d725d7 | 1056 | else if (GET_CODE (orig) == CONST) |
1057 | { | |
1058 | return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
1059 | } | |
80d725d7 | 1060 | else if (GET_CODE (orig) == MEM |
1061 | && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF) | |
1062 | { | |
1063 | rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
b04fab2a | 1064 | addr = replace_equiv_address (orig, addr); |
80d725d7 | 1065 | emit_move_insn (reg, addr); |
1066 | pic_ref = reg; | |
1067 | } | |
1068 | ||
1069 | return pic_ref; | |
1070 | } | |
1071 | ||
ab06d2ff | 1072 | /* Output the stub or non-lazy pointer in *SLOT, if it has been used. |
1073 | DATA is the FILE* for assembly output. Called from | |
1074 | htab_traverse. */ | |
80d725d7 | 1075 | |
2ef51f0e | 1076 | int |
1077 | machopic_output_indirection (machopic_indirection **slot, FILE *asm_out_file) | |
80d725d7 | 1078 | { |
2ef51f0e | 1079 | machopic_indirection *p = *slot; |
ab06d2ff | 1080 | rtx symbol; |
1081 | const char *sym_name; | |
1082 | const char *ptr_name; | |
b215c058 | 1083 | |
ab06d2ff | 1084 | if (!p->used) |
1085 | return 1; | |
80d725d7 | 1086 | |
ab06d2ff | 1087 | symbol = p->symbol; |
1088 | sym_name = XSTR (symbol, 0); | |
6d3abfc0 | 1089 | ptr_name = p->ptr_name; |
b215c058 | 1090 | |
ab06d2ff | 1091 | if (p->stub_p) |
80d725d7 | 1092 | { |
80d725d7 | 1093 | char *sym; |
1094 | char *stub; | |
b359164b | 1095 | tree id; |
1096 | ||
1097 | id = maybe_get_identifier (sym_name); | |
1098 | if (id) | |
1099 | { | |
1100 | tree id_orig = id; | |
1101 | ||
1102 | while (IDENTIFIER_TRANSPARENT_ALIAS (id)) | |
1103 | id = TREE_CHAIN (id); | |
1104 | if (id != id_orig) | |
1105 | sym_name = IDENTIFIER_POINTER (id); | |
1106 | } | |
80d725d7 | 1107 | |
225ab426 | 1108 | sym = XALLOCAVEC (char, strlen (sym_name) + 2); |
80d725d7 | 1109 | if (sym_name[0] == '*' || sym_name[0] == '&') |
1110 | strcpy (sym, sym_name + 1); | |
1111 | else if (sym_name[0] == '-' || sym_name[0] == '+') | |
b40da9a7 | 1112 | strcpy (sym, sym_name); |
80d725d7 | 1113 | else |
e9764bbb | 1114 | sprintf (sym, "%s%s", user_label_prefix, sym_name); |
80d725d7 | 1115 | |
225ab426 | 1116 | stub = XALLOCAVEC (char, strlen (ptr_name) + 2); |
ab06d2ff | 1117 | if (ptr_name[0] == '*' || ptr_name[0] == '&') |
1118 | strcpy (stub, ptr_name + 1); | |
80d725d7 | 1119 | else |
ab06d2ff | 1120 | sprintf (stub, "%s%s", user_label_prefix, ptr_name); |
80d725d7 | 1121 | |
09e39ca0 | 1122 | machopic_output_stub (asm_out_file, sym, stub); |
80d725d7 | 1123 | } |
f0ed0e8a | 1124 | else if (! indirect_data (symbol) |
8d806159 | 1125 | && (machopic_symbol_defined_p (symbol) |
1126 | || SYMBOL_REF_LOCAL_P (symbol))) | |
80d725d7 | 1127 | { |
2f14b1f9 | 1128 | switch_to_section (data_section); |
ab06d2ff | 1129 | assemble_align (GET_MODE_ALIGNMENT (Pmode)); |
427eb138 | 1130 | assemble_label (asm_out_file, ptr_name); |
ab06d2ff | 1131 | assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name), |
1132 | GET_MODE_SIZE (Pmode), | |
1133 | GET_MODE_ALIGNMENT (Pmode), 1); | |
80d725d7 | 1134 | } |
ab06d2ff | 1135 | else |
1136 | { | |
f0ed0e8a | 1137 | rtx init = const0_rtx; |
1138 | ||
92e4ba7d | 1139 | switch_to_section (darwin_sections[machopic_nl_symbol_ptr_section]); |
cd186228 | 1140 | |
1141 | /* Mach-O symbols are passed around in code through indirect | |
1142 | references and the original symbol_ref hasn't passed through | |
1143 | the generic handling and reference-catching in | |
1144 | output_operand, so we need to manually mark weak references | |
1145 | as such. */ | |
1146 | if (SYMBOL_REF_WEAK (symbol)) | |
1147 | { | |
1148 | tree decl = SYMBOL_REF_DECL (symbol); | |
1149 | gcc_assert (DECL_P (decl)); | |
1150 | ||
1151 | if (decl != NULL_TREE | |
1152 | && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl) | |
1153 | /* Handle only actual external-only definitions, not | |
1154 | e.g. extern inline code or variables for which | |
1155 | storage has been allocated. */ | |
1156 | && !TREE_STATIC (decl)) | |
1157 | { | |
1158 | fputs ("\t.weak_reference ", asm_out_file); | |
1159 | assemble_name (asm_out_file, sym_name); | |
1160 | fputc ('\n', asm_out_file); | |
1161 | } | |
1162 | } | |
1163 | ||
ab06d2ff | 1164 | assemble_name (asm_out_file, ptr_name); |
1165 | fprintf (asm_out_file, ":\n"); | |
b215c058 | 1166 | |
ab06d2ff | 1167 | fprintf (asm_out_file, "\t.indirect_symbol "); |
1168 | assemble_name (asm_out_file, sym_name); | |
1169 | fprintf (asm_out_file, "\n"); | |
b215c058 | 1170 | |
f0ed0e8a | 1171 | /* Variables that are marked with MACHO_SYMBOL_STATIC need to |
1172 | have their symbol name instead of 0 in the second entry of | |
1173 | the non-lazy symbol pointer data structure when they are | |
1174 | defined. This allows the runtime to rebind newer instances | |
1175 | of the translation unit with the original instance of the | |
d188633a | 1176 | symbol. */ |
f0ed0e8a | 1177 | |
1178 | if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC) | |
1179 | && machopic_symbol_defined_p (symbol)) | |
1180 | init = gen_rtx_SYMBOL_REF (Pmode, sym_name); | |
1181 | ||
1182 | assemble_integer (init, GET_MODE_SIZE (Pmode), | |
ab06d2ff | 1183 | GET_MODE_ALIGNMENT (Pmode), 1); |
1184 | } | |
b215c058 | 1185 | |
ab06d2ff | 1186 | return 1; |
1187 | } | |
1188 | ||
1189 | void | |
1190 | machopic_finish (FILE *asm_out_file) | |
1191 | { | |
1192 | if (machopic_indirections) | |
2ef51f0e | 1193 | machopic_indirections |
1194 | ->traverse_noresize<FILE *, machopic_output_indirection> (asm_out_file); | |
80d725d7 | 1195 | } |
1196 | ||
b40da9a7 | 1197 | int |
1198 | machopic_operand_p (rtx op) | |
80d725d7 | 1199 | { |
1200 | if (MACHOPIC_JUST_INDIRECT) | |
a914e728 | 1201 | return (GET_CODE (op) == SYMBOL_REF |
1202 | && machopic_symbol_defined_p (op)); | |
1203 | else | |
1204 | return (GET_CODE (op) == CONST | |
1205 | && GET_CODE (XEXP (op, 0)) == UNSPEC | |
1206 | && XINT (XEXP (op, 0), 1) == UNSPEC_MACHOPIC_OFFSET); | |
80d725d7 | 1207 | } |
8dfaa51b | 1208 | |
1209 | /* This function records whether a given name corresponds to a defined | |
1210 | or undefined function or variable, for machopic_classify_ident to | |
1211 | use later. */ | |
1212 | ||
1213 | void | |
b40da9a7 | 1214 | darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED) |
8dfaa51b | 1215 | { |
5a121a91 | 1216 | rtx sym_ref; |
8dfaa51b | 1217 | |
9af9a32c | 1218 | /* Do the standard encoding things first. */ |
1219 | default_encode_section_info (decl, rtl, first); | |
1220 | ||
ab06d2ff | 1221 | if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL) |
1222 | return; | |
9af9a32c | 1223 | |
ab06d2ff | 1224 | sym_ref = XEXP (rtl, 0); |
1225 | if (TREE_CODE (decl) == VAR_DECL) | |
1226 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE; | |
1227 | ||
1228 | if (!DECL_EXTERNAL (decl) | |
1dc74225 | 1229 | && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl)) |
0a3ecdc1 | 1230 | && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)) |
8dfaa51b | 1231 | && ((TREE_STATIC (decl) |
1232 | && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl))) | |
2f4fae92 | 1233 | || (!DECL_COMMON (decl) && DECL_INITIAL (decl) |
fd419242 | 1234 | && DECL_INITIAL (decl) != error_mark_node))) |
ab06d2ff | 1235 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED; |
f0ed0e8a | 1236 | |
d188633a | 1237 | if (! TREE_PUBLIC (decl)) |
f0ed0e8a | 1238 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC; |
e479d0de | 1239 | } |
01d15dc5 | 1240 | |
9423c9b7 | 1241 | void |
1242 | darwin_mark_decl_preserved (const char *name) | |
1243 | { | |
565f322f | 1244 | /* Actually we shouldn't mark any local symbol this way, but for now |
1245 | this only happens with ObjC meta-data. */ | |
1246 | if (darwin_label_is_anonymous_local_objc_name (name)) | |
1247 | return; | |
1248 | ||
163c9fff | 1249 | fprintf (asm_out_file, "\t.no_dead_strip "); |
9423c9b7 | 1250 | assemble_name (asm_out_file, name); |
1251 | fputc ('\n', asm_out_file); | |
1252 | } | |
1253 | ||
50e6797e | 1254 | static section * |
f199808c | 1255 | darwin_rodata_section (int use_coal, bool zsize) |
50e6797e | 1256 | { |
f199808c | 1257 | return (use_coal |
50e6797e | 1258 | ? darwin_sections[const_coal_section] |
8e79e9d4 | 1259 | : (zsize ? darwin_sections[zobj_const_section] |
1260 | : darwin_sections[const_section])); | |
50e6797e | 1261 | } |
b40da9a7 | 1262 | |
50e6797e | 1263 | static section * |
1264 | darwin_mergeable_string_section (tree exp, | |
1265 | unsigned HOST_WIDE_INT align) | |
1266 | { | |
1991f4fd | 1267 | /* Darwin's ld expects to see non-writable string literals in the .cstring |
1268 | section. Later versions of ld check and complain when CFStrings are | |
1269 | enabled. Therefore we shall force the strings into .cstring since we | |
1270 | don't support writable ones anyway. */ | |
1271 | if ((darwin_constant_cfstrings || flag_merge_constants) | |
50e6797e | 1272 | && TREE_CODE (exp) == STRING_CST |
1273 | && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE | |
1274 | && align <= 256 | |
a7df40d7 | 1275 | && (int_size_in_bytes (TREE_TYPE (exp)) |
1276 | == TREE_STRING_LENGTH (exp)) | |
b40da9a7 | 1277 | && ((size_t) TREE_STRING_LENGTH (exp) |
a814bad5 | 1278 | == strlen (TREE_STRING_POINTER (exp)) + 1)) |
92e4ba7d | 1279 | return darwin_sections[cstring_section]; |
50e6797e | 1280 | |
8e79e9d4 | 1281 | if (DARWIN_SECTION_ANCHORS && flag_section_anchors |
1282 | && TREE_CODE (exp) == STRING_CST | |
1283 | && TREE_STRING_LENGTH (exp) == 0) | |
1284 | return darwin_sections[zobj_const_section]; | |
1285 | ||
50e6797e | 1286 | return readonly_data_section; |
1287 | } | |
1288 | ||
4be92808 | 1289 | #ifndef HAVE_GAS_LITERAL16 |
1290 | #define HAVE_GAS_LITERAL16 0 | |
1291 | #endif | |
1292 | ||
50e6797e | 1293 | static section * |
1294 | darwin_mergeable_constant_section (tree exp, | |
8e79e9d4 | 1295 | unsigned HOST_WIDE_INT align, |
1296 | bool zsize) | |
50e6797e | 1297 | { |
3754d046 | 1298 | machine_mode mode = DECL_MODE (exp); |
50e6797e | 1299 | unsigned int modesize = GET_MODE_BITSIZE (mode); |
1300 | ||
8e79e9d4 | 1301 | if (DARWIN_SECTION_ANCHORS |
1302 | && flag_section_anchors | |
1303 | && zsize) | |
1304 | return darwin_sections[zobj_const_section]; | |
1305 | ||
50e6797e | 1306 | if (flag_merge_constants |
1307 | && mode != VOIDmode | |
1308 | && mode != BLKmode | |
1309 | && modesize <= align | |
1310 | && align >= 8 | |
1311 | && align <= 256 | |
1312 | && (align & (align -1)) == 0) | |
52470889 | 1313 | { |
853b103d | 1314 | tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp)); |
52470889 | 1315 | |
e913b5cd | 1316 | if (TREE_CODE (size) == INTEGER_CST) |
1317 | { | |
e3d0f65c | 1318 | if (wi::to_wide (size) == 4) |
e913b5cd | 1319 | return darwin_sections[literal4_section]; |
e3d0f65c | 1320 | else if (wi::to_wide (size) == 8) |
e913b5cd | 1321 | return darwin_sections[literal8_section]; |
1322 | else if (HAVE_GAS_LITERAL16 | |
1323 | && TARGET_64BIT | |
e3d0f65c | 1324 | && wi::to_wide (size) == 16) |
e913b5cd | 1325 | return darwin_sections[literal16_section]; |
1326 | } | |
50e6797e | 1327 | } |
1328 | ||
1329 | return readonly_data_section; | |
1330 | } | |
1331 | ||
e3ef604c | 1332 | section * |
1333 | darwin_tm_clone_table_section (void) | |
1334 | { | |
1335 | return get_named_section (NULL, | |
1336 | "__DATA,__tm_clone_table,regular,no_dead_strip", | |
1337 | 3); | |
1338 | } | |
1339 | ||
0b769e4a | 1340 | int |
1341 | machopic_reloc_rw_mask (void) | |
1342 | { | |
1343 | return MACHOPIC_INDIRECT ? 3 : 0; | |
1344 | } | |
1345 | ||
267785bc | 1346 | /* We have to deal with ObjC/C++ metadata section placement in the common |
1347 | code, since it will also be called from LTO. | |
1348 | ||
1349 | Return metadata attributes, if present (searching for ABI=2 first) | |
1350 | Return NULL_TREE if no such attributes are found. */ | |
1351 | ||
1352 | static tree | |
1353 | is_objc_metadata (tree decl) | |
1354 | { | |
1355 | if (DECL_P (decl) | |
1356 | && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == CONST_DECL) | |
1357 | && DECL_ATTRIBUTES (decl)) | |
1358 | { | |
1359 | tree meta = lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl)); | |
1360 | if (meta) | |
1361 | return meta; | |
1362 | meta = lookup_attribute ("OBJC1META", DECL_ATTRIBUTES (decl)); | |
1363 | if (meta) | |
1364 | return meta; | |
1365 | } | |
1366 | return NULL_TREE; | |
1367 | } | |
1368 | ||
236ce1d1 | 1369 | static int classes_seen; |
1370 | static int objc_metadata_seen; | |
1371 | ||
267785bc | 1372 | /* Return the section required for Objective C ABI 2 metadata. */ |
1373 | static section * | |
1374 | darwin_objc2_section (tree decl ATTRIBUTE_UNUSED, tree meta, section * base) | |
1375 | { | |
1376 | const char *p; | |
1377 | tree ident = TREE_VALUE (meta); | |
1378 | gcc_assert (TREE_CODE (ident) == IDENTIFIER_NODE); | |
1379 | p = IDENTIFIER_POINTER (ident); | |
1380 | ||
236ce1d1 | 1381 | gcc_checking_assert (flag_next_runtime == 1 && flag_objc_abi == 2); |
267785bc | 1382 | |
236ce1d1 | 1383 | objc_metadata_seen = 1; |
267785bc | 1384 | |
1385 | if (base == data_section) | |
1386 | base = darwin_sections[objc2_metadata_section]; | |
1387 | ||
1388 | /* Most of the OBJC2 META-data end up in the base section, so check it | |
1389 | first. */ | |
1390 | if (!strncmp (p, "V2_BASE", 7)) | |
1391 | return base; | |
1392 | else if (!strncmp (p, "V2_STRG", 7)) | |
1393 | return darwin_sections[cstring_section]; | |
1394 | ||
1395 | else if (!strncmp (p, "G2_META", 7) || !strncmp (p, "G2_CLAS", 7)) | |
1396 | return darwin_sections[objc2_classdefs_section]; | |
1397 | else if (!strncmp (p, "V2_MREF", 7)) | |
1398 | return darwin_sections[objc2_message_refs_section]; | |
1399 | else if (!strncmp (p, "V2_CLRF", 7)) | |
1400 | return darwin_sections[objc2_classrefs_section]; | |
1401 | else if (!strncmp (p, "V2_SURF", 7)) | |
1402 | return darwin_sections[objc2_super_classrefs_section]; | |
1403 | else if (!strncmp (p, "V2_NLCL", 7)) | |
1404 | return darwin_sections[objc2_nonlazy_class_section]; | |
1405 | else if (!strncmp (p, "V2_CLAB", 7)) | |
236ce1d1 | 1406 | { |
1407 | classes_seen = 1; | |
1408 | return darwin_sections[objc2_classlist_section]; | |
1409 | } | |
267785bc | 1410 | else if (!strncmp (p, "V2_SRFS", 7)) |
1411 | return darwin_sections[objc2_selector_refs_section]; | |
1412 | else if (!strncmp (p, "V2_NLCA", 7)) | |
1413 | return darwin_sections[objc2_nonlazy_category_section]; | |
1414 | else if (!strncmp (p, "V2_CALA", 7)) | |
1415 | return darwin_sections[objc2_categorylist_section]; | |
1416 | ||
1417 | else if (!strncmp (p, "V2_PLST", 7)) | |
1418 | return darwin_sections[objc2_protocollist_section]; | |
1419 | else if (!strncmp (p, "V2_PRFS", 7)) | |
1420 | return darwin_sections[objc2_protocolrefs_section]; | |
1421 | ||
1422 | else if (!strncmp (p, "V2_INFO", 7)) | |
1423 | return darwin_sections[objc2_image_info_section]; | |
1424 | ||
1425 | else if (!strncmp (p, "V2_EHTY", 7)) | |
f199808c | 1426 | return ld_uses_coal_sects ? darwin_sections[data_coal_section] |
1427 | : data_section; | |
267785bc | 1428 | |
1429 | else if (!strncmp (p, "V2_CSTR", 7)) | |
1430 | return darwin_sections[objc2_constant_string_object_section]; | |
1431 | ||
1432 | /* Not recognized, default. */ | |
1433 | return base; | |
1434 | } | |
1435 | ||
1436 | /* Return the section required for Objective C ABI 0/1 metadata. */ | |
1437 | static section * | |
1438 | darwin_objc1_section (tree decl ATTRIBUTE_UNUSED, tree meta, section * base) | |
1439 | { | |
1440 | const char *p; | |
1441 | tree ident = TREE_VALUE (meta); | |
1442 | gcc_assert (TREE_CODE (ident) == IDENTIFIER_NODE); | |
1443 | p = IDENTIFIER_POINTER (ident); | |
1444 | ||
236ce1d1 | 1445 | gcc_checking_assert (flag_next_runtime == 1 && flag_objc_abi < 2); |
1446 | ||
1447 | objc_metadata_seen = 1; | |
267785bc | 1448 | |
1449 | /* String sections first, cos there are lots of strings. */ | |
1450 | if (!strncmp (p, "V1_STRG", 7)) | |
1451 | return darwin_sections[cstring_section]; | |
1452 | else if (!strncmp (p, "V1_CLSN", 7)) | |
1453 | return darwin_sections[objc_class_names_section]; | |
1454 | else if (!strncmp (p, "V1_METN", 7)) | |
1455 | return darwin_sections[objc_meth_var_names_section]; | |
1456 | else if (!strncmp (p, "V1_METT", 7)) | |
1457 | return darwin_sections[objc_meth_var_types_section]; | |
1458 | ||
1459 | else if (!strncmp (p, "V1_CLAS", 7)) | |
236ce1d1 | 1460 | { |
1461 | classes_seen = 1; | |
1462 | return darwin_sections[objc_class_section]; | |
1463 | } | |
267785bc | 1464 | else if (!strncmp (p, "V1_META", 7)) |
1465 | return darwin_sections[objc_meta_class_section]; | |
1466 | else if (!strncmp (p, "V1_CATG", 7)) | |
1467 | return darwin_sections[objc_category_section]; | |
1468 | else if (!strncmp (p, "V1_PROT", 7)) | |
1469 | return darwin_sections[objc_protocol_section]; | |
1470 | ||
1471 | else if (!strncmp (p, "V1_CLCV", 7)) | |
1472 | return darwin_sections[objc_class_vars_section]; | |
1473 | else if (!strncmp (p, "V1_CLIV", 7)) | |
1474 | return darwin_sections[objc_instance_vars_section]; | |
1475 | ||
1476 | else if (!strncmp (p, "V1_CLCM", 7)) | |
1477 | return darwin_sections[objc_cls_meth_section]; | |
1478 | else if (!strncmp (p, "V1_CLIM", 7)) | |
1479 | return darwin_sections[objc_inst_meth_section]; | |
1480 | else if (!strncmp (p, "V1_CACM", 7)) | |
1481 | return darwin_sections[objc_cat_cls_meth_section]; | |
1482 | else if (!strncmp (p, "V1_CAIM", 7)) | |
1483 | return darwin_sections[objc_cat_inst_meth_section]; | |
1484 | else if (!strncmp (p, "V1_PNSM", 7)) | |
1485 | return darwin_sections[objc_cat_inst_meth_section]; | |
1486 | else if (!strncmp (p, "V1_PCLM", 7)) | |
1487 | return darwin_sections[objc_cat_cls_meth_section]; | |
1488 | ||
1489 | else if (!strncmp (p, "V1_CLPR", 7)) | |
1490 | return darwin_sections[objc_cat_cls_meth_section]; | |
1491 | else if (!strncmp (p, "V1_CAPR", 7)) | |
1492 | return darwin_sections[objc_category_section]; /* ??? CHECK me. */ | |
1493 | ||
1494 | else if (!strncmp (p, "V1_PRFS", 7)) | |
1495 | return darwin_sections[objc_cat_cls_meth_section]; | |
1496 | else if (!strncmp (p, "V1_CLRF", 7)) | |
1497 | return darwin_sections[objc_cls_refs_section]; | |
1498 | else if (!strncmp (p, "V1_SRFS", 7)) | |
1499 | return darwin_sections[objc_selector_refs_section]; | |
1500 | ||
1501 | else if (!strncmp (p, "V1_MODU", 7)) | |
1502 | return darwin_sections[objc_module_info_section]; | |
1503 | else if (!strncmp (p, "V1_SYMT", 7)) | |
1504 | return darwin_sections[objc_symbols_section]; | |
1505 | else if (!strncmp (p, "V1_INFO", 7)) | |
1506 | return darwin_sections[objc_image_info_section]; | |
1507 | ||
1508 | else if (!strncmp (p, "V1_PLST", 7)) | |
1509 | return darwin_sections[objc1_prop_list_section]; | |
1510 | else if (!strncmp (p, "V1_PEXT", 7)) | |
1511 | return darwin_sections[objc1_protocol_ext_section]; | |
1512 | else if (!strncmp (p, "V1_CEXT", 7)) | |
1513 | return darwin_sections[objc1_class_ext_section]; | |
1514 | ||
1515 | else if (!strncmp (p, "V2_CSTR", 7)) | |
1516 | return darwin_sections[objc_constant_string_object_section]; | |
1517 | ||
1518 | return base; | |
1519 | } | |
1520 | ||
50e6797e | 1521 | section * |
1522 | machopic_select_section (tree decl, | |
1523 | int reloc, | |
1524 | unsigned HOST_WIDE_INT align) | |
1525 | { | |
f199808c | 1526 | bool zsize, one, weak, use_coal, ro; |
3b73548b | 1527 | section *base_section = NULL; |
50e6797e | 1528 | |
8e79e9d4 | 1529 | weak = (DECL_P (decl) |
1530 | && DECL_WEAK (decl) | |
1531 | && !lookup_attribute ("weak_import", DECL_ATTRIBUTES (decl))); | |
1532 | ||
f199808c | 1533 | zsize = (DECL_P (decl) |
8e79e9d4 | 1534 | && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == CONST_DECL) |
e913b5cd | 1535 | && tree_to_uhwi (DECL_SIZE_UNIT (decl)) == 0); |
8e79e9d4 | 1536 | |
f199808c | 1537 | one = DECL_P (decl) |
8e79e9d4 | 1538 | && TREE_CODE (decl) == VAR_DECL |
b395f451 | 1539 | && DECL_COMDAT_GROUP (decl); |
8e79e9d4 | 1540 | |
f199808c | 1541 | use_coal = (weak || one) && ld_uses_coal_sects; |
1542 | ||
8e79e9d4 | 1543 | ro = TREE_READONLY (decl) || TREE_CONSTANT (decl) ; |
1544 | ||
c6134e23 | 1545 | switch (categorize_decl_for_section (decl, reloc)) |
50e6797e | 1546 | { |
1547 | case SECCAT_TEXT: | |
9e09909d | 1548 | gcc_unreachable (); |
50e6797e | 1549 | break; |
1550 | ||
1551 | case SECCAT_RODATA: | |
1552 | case SECCAT_SRODATA: | |
f199808c | 1553 | base_section = darwin_rodata_section (use_coal, zsize); |
50e6797e | 1554 | break; |
1555 | ||
1556 | case SECCAT_RODATA_MERGE_STR: | |
1557 | base_section = darwin_mergeable_string_section (decl, align); | |
1558 | break; | |
1559 | ||
1560 | case SECCAT_RODATA_MERGE_STR_INIT: | |
1561 | base_section = darwin_mergeable_string_section (DECL_INITIAL (decl), align); | |
1562 | break; | |
1563 | ||
1564 | case SECCAT_RODATA_MERGE_CONST: | |
8e79e9d4 | 1565 | base_section = darwin_mergeable_constant_section (decl, align, zsize); |
50e6797e | 1566 | break; |
1567 | ||
1568 | case SECCAT_DATA: | |
1569 | case SECCAT_DATA_REL: | |
1570 | case SECCAT_DATA_REL_LOCAL: | |
1571 | case SECCAT_DATA_REL_RO: | |
1572 | case SECCAT_DATA_REL_RO_LOCAL: | |
1573 | case SECCAT_SDATA: | |
1574 | case SECCAT_TDATA: | |
f199808c | 1575 | if (use_coal) |
8e79e9d4 | 1576 | { |
1577 | if (ro) | |
1578 | base_section = darwin_sections[const_data_coal_section]; | |
1579 | else | |
1580 | base_section = darwin_sections[data_coal_section]; | |
1581 | } | |
1582 | else if (DARWIN_SECTION_ANCHORS | |
1583 | && flag_section_anchors | |
1584 | && zsize) | |
1585 | { | |
1586 | /* If we're doing section anchors, then punt zero-sized objects into | |
1587 | their own sections so that they don't interfere with offset | |
1588 | computation for the remaining vars. This does not need to be done | |
1589 | for stuff in mergeable sections, since these are ineligible for | |
1590 | anchors. */ | |
1591 | if (ro) | |
1592 | base_section = darwin_sections[zobj_const_data_section]; | |
1593 | else | |
1594 | base_section = darwin_sections[zobj_data_section]; | |
1595 | } | |
1596 | else if (ro) | |
1597 | base_section = darwin_sections[const_data_section]; | |
1598 | else | |
1599 | base_section = data_section; | |
1600 | break; | |
50e6797e | 1601 | case SECCAT_BSS: |
1602 | case SECCAT_SBSS: | |
1603 | case SECCAT_TBSS: | |
f199808c | 1604 | if (use_coal) |
8e79e9d4 | 1605 | base_section = darwin_sections[data_coal_section]; |
52470889 | 1606 | else |
8e79e9d4 | 1607 | { |
1608 | if (!TREE_PUBLIC (decl)) | |
1609 | base_section = lcomm_section; | |
1610 | else if (bss_noswitch_section) | |
1611 | base_section = bss_noswitch_section; | |
1612 | else | |
1613 | base_section = data_section; | |
1614 | } | |
50e6797e | 1615 | break; |
1616 | ||
1617 | default: | |
1618 | gcc_unreachable (); | |
52470889 | 1619 | } |
50e6797e | 1620 | |
267785bc | 1621 | /* Darwin weird special cases. |
1622 | a) OBJC Meta-data. */ | |
1623 | if (DECL_P (decl) | |
1624 | && (TREE_CODE (decl) == VAR_DECL | |
1625 | || TREE_CODE (decl) == CONST_DECL) | |
1626 | && DECL_ATTRIBUTES (decl)) | |
1627 | { | |
1628 | tree meta = lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl)); | |
1629 | if (meta) | |
1630 | return darwin_objc2_section (decl, meta, base_section); | |
1631 | meta = lookup_attribute ("OBJC1META", DECL_ATTRIBUTES (decl)); | |
1632 | if (meta) | |
1633 | return darwin_objc1_section (decl, meta, base_section); | |
1634 | meta = lookup_attribute ("OBJC1METG", DECL_ATTRIBUTES (decl)); | |
1635 | if (meta) | |
1636 | return base_section; /* GNU runtime is happy with it all in one pot. */ | |
1637 | } | |
1638 | ||
1639 | /* b) Constant string objects. */ | |
50e6797e | 1640 | if (TREE_CODE (decl) == CONSTRUCTOR |
1641 | && TREE_TYPE (decl) | |
1642 | && TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
1643 | && TYPE_NAME (TREE_TYPE (decl))) | |
52470889 | 1644 | { |
50e6797e | 1645 | tree name = TYPE_NAME (TREE_TYPE (decl)); |
52470889 | 1646 | if (TREE_CODE (name) == TYPE_DECL) |
50e6797e | 1647 | name = DECL_NAME (name); |
0616a948 | 1648 | |
1649 | if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_ObjCString")) | |
267785bc | 1650 | { |
1651 | if (flag_next_runtime) | |
1652 | { | |
1653 | if (flag_objc_abi == 2) | |
1654 | return darwin_sections[objc2_constant_string_object_section]; | |
1655 | else | |
1656 | return darwin_sections[objc_constant_string_object_section]; | |
1657 | } | |
1658 | else | |
1659 | return darwin_sections[objc_string_object_section]; | |
1660 | } | |
d4238e8b | 1661 | else if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_CFString")) |
1662 | return darwin_sections[cfstring_constant_object_section]; | |
52470889 | 1663 | else |
267785bc | 1664 | return base_section; |
52470889 | 1665 | } |
267785bc | 1666 | /* c) legacy meta-data selection. */ |
50e6797e | 1667 | else if (TREE_CODE (decl) == VAR_DECL |
1668 | && DECL_NAME (decl) | |
1669 | && TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE | |
1670 | && IDENTIFIER_POINTER (DECL_NAME (decl)) | |
267785bc | 1671 | && flag_next_runtime |
50e6797e | 1672 | && !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "_OBJC_", 6)) |
52470889 | 1673 | { |
50e6797e | 1674 | const char *name = IDENTIFIER_POINTER (DECL_NAME (decl)); |
267785bc | 1675 | static bool warned_objc_46 = false; |
8e79e9d4 | 1676 | /* We shall assert that zero-sized objects are an error in ObjC |
1677 | meta-data. */ | |
e913b5cd | 1678 | gcc_assert (tree_to_uhwi (DECL_SIZE_UNIT (decl)) != 0); |
267785bc | 1679 | |
1680 | /* ??? This mechanism for determining the metadata section is | |
1681 | broken when LTO is in use, since the frontend that generated | |
1682 | the data is not identified. We will keep the capability for | |
1683 | the short term - in case any non-Objective-C programs are using | |
1684 | it to place data in specified sections. */ | |
1685 | if (!warned_objc_46) | |
1686 | { | |
1687 | location_t loc = DECL_SOURCE_LOCATION (decl); | |
1688 | warning_at (loc, 0, "the use of _OBJC_-prefixed variable names" | |
1689 | " to select meta-data sections is deprecated at 4.6" | |
1690 | " and will be removed in 4.7"); | |
1691 | warned_objc_46 = true; | |
1692 | } | |
1693 | ||
52470889 | 1694 | if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20)) |
50e6797e | 1695 | return darwin_sections[objc_cls_meth_section]; |
52470889 | 1696 | else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23)) |
50e6797e | 1697 | return darwin_sections[objc_inst_meth_section]; |
8e79e9d4 | 1698 | else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 29)) |
50e6797e | 1699 | return darwin_sections[objc_cat_cls_meth_section]; |
8e79e9d4 | 1700 | else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 32)) |
50e6797e | 1701 | return darwin_sections[objc_cat_inst_meth_section]; |
52470889 | 1702 | else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22)) |
50e6797e | 1703 | return darwin_sections[objc_class_vars_section]; |
52470889 | 1704 | else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25)) |
50e6797e | 1705 | return darwin_sections[objc_instance_vars_section]; |
52470889 | 1706 | else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22)) |
50e6797e | 1707 | return darwin_sections[objc_cat_cls_meth_section]; |
52470889 | 1708 | else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17)) |
50e6797e | 1709 | return darwin_sections[objc_class_names_section]; |
52470889 | 1710 | else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20)) |
50e6797e | 1711 | return darwin_sections[objc_meth_var_names_section]; |
52470889 | 1712 | else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20)) |
50e6797e | 1713 | return darwin_sections[objc_meth_var_types_section]; |
52470889 | 1714 | else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22)) |
50e6797e | 1715 | return darwin_sections[objc_cls_refs_section]; |
52470889 | 1716 | else if (!strncmp (name, "_OBJC_CLASS_", 12)) |
50e6797e | 1717 | return darwin_sections[objc_class_section]; |
52470889 | 1718 | else if (!strncmp (name, "_OBJC_METACLASS_", 16)) |
50e6797e | 1719 | return darwin_sections[objc_meta_class_section]; |
52470889 | 1720 | else if (!strncmp (name, "_OBJC_CATEGORY_", 15)) |
50e6797e | 1721 | return darwin_sections[objc_category_section]; |
52470889 | 1722 | else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25)) |
50e6797e | 1723 | return darwin_sections[objc_selector_refs_section]; |
52470889 | 1724 | else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20)) |
50e6797e | 1725 | return darwin_sections[objc_selector_fixup_section]; |
52470889 | 1726 | else if (!strncmp (name, "_OBJC_SYMBOLS", 13)) |
50e6797e | 1727 | return darwin_sections[objc_symbols_section]; |
52470889 | 1728 | else if (!strncmp (name, "_OBJC_MODULES", 13)) |
50e6797e | 1729 | return darwin_sections[objc_module_info_section]; |
c17b85ea | 1730 | else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16)) |
50e6797e | 1731 | return darwin_sections[objc_image_info_section]; |
52470889 | 1732 | else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32)) |
50e6797e | 1733 | return darwin_sections[objc_cat_inst_meth_section]; |
52470889 | 1734 | else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29)) |
50e6797e | 1735 | return darwin_sections[objc_cat_cls_meth_section]; |
52470889 | 1736 | else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20)) |
50e6797e | 1737 | return darwin_sections[objc_cat_cls_meth_section]; |
52470889 | 1738 | else if (!strncmp (name, "_OBJC_PROTOCOL_", 15)) |
50e6797e | 1739 | return darwin_sections[objc_protocol_section]; |
52470889 | 1740 | else |
50e6797e | 1741 | return base_section; |
52470889 | 1742 | } |
50e6797e | 1743 | |
1744 | return base_section; | |
52470889 | 1745 | } |
1746 | ||
bbfbe351 | 1747 | /* This can be called with address expressions as "rtx". |
9cb8e99f | 1748 | They must go in "const". */ |
bbfbe351 | 1749 | |
2f14b1f9 | 1750 | section * |
3754d046 | 1751 | machopic_select_rtx_section (machine_mode mode, rtx x, |
b40da9a7 | 1752 | unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED) |
bbfbe351 | 1753 | { |
f2e8796e | 1754 | if (GET_MODE_SIZE (mode) == 8 |
1755 | && (GET_CODE (x) == CONST_INT | |
219f3246 | 1756 | || GET_CODE (x) == CONST_WIDE_INT |
f2e8796e | 1757 | || GET_CODE (x) == CONST_DOUBLE)) |
92e4ba7d | 1758 | return darwin_sections[literal8_section]; |
bbfbe351 | 1759 | else if (GET_MODE_SIZE (mode) == 4 |
1760 | && (GET_CODE (x) == CONST_INT | |
219f3246 | 1761 | || GET_CODE (x) == CONST_WIDE_INT |
bbfbe351 | 1762 | || GET_CODE (x) == CONST_DOUBLE)) |
92e4ba7d | 1763 | return darwin_sections[literal4_section]; |
4be92808 | 1764 | else if (HAVE_GAS_LITERAL16 |
1765 | && TARGET_64BIT | |
7463cbdf | 1766 | && GET_MODE_SIZE (mode) == 16 |
3ebc7dec | 1767 | && (GET_CODE (x) == CONST_INT |
219f3246 | 1768 | || GET_CODE (x) == CONST_WIDE_INT |
2805e80b | 1769 | || GET_CODE (x) == CONST_DOUBLE |
1770 | || GET_CODE (x) == CONST_VECTOR)) | |
3ebc7dec | 1771 | return darwin_sections[literal16_section]; |
459f8624 | 1772 | else if (MACHOPIC_INDIRECT |
76dece62 | 1773 | && (GET_CODE (x) == SYMBOL_REF |
1774 | || GET_CODE (x) == CONST | |
1775 | || GET_CODE (x) == LABEL_REF)) | |
92e4ba7d | 1776 | return darwin_sections[const_data_section]; |
bbfbe351 | 1777 | else |
92e4ba7d | 1778 | return darwin_sections[const_section]; |
bbfbe351 | 1779 | } |
1780 | ||
01d15dc5 | 1781 | void |
b40da9a7 | 1782 | machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED) |
01d15dc5 | 1783 | { |
ed161dab | 1784 | cdtor_record new_elt = {symbol, priority, vec_safe_length (ctors)}; |
4b313269 | 1785 | |
1786 | vec_safe_push (ctors, new_elt); | |
1787 | ||
1788 | if (! MACHOPIC_INDIRECT) | |
1789 | fprintf (asm_out_file, ".reference .constructors_used\n"); | |
1790 | } | |
1791 | ||
ed161dab | 1792 | void |
1793 | machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED) | |
1794 | { | |
1795 | cdtor_record new_elt = {symbol, priority, vec_safe_length (dtors)}; | |
1796 | ||
1797 | vec_safe_push (dtors, new_elt); | |
1798 | ||
1799 | if (! MACHOPIC_INDIRECT) | |
1800 | fprintf (asm_out_file, ".reference .destructors_used\n"); | |
1801 | } | |
1802 | ||
4b313269 | 1803 | static int |
ed161dab | 1804 | sort_cdtor_records (const void * a, const void * b) |
4b313269 | 1805 | { |
ed161dab | 1806 | const cdtor_record *cda = (const cdtor_record *)a; |
1807 | const cdtor_record *cdb = (const cdtor_record *)b; | |
1808 | if (cda->priority > cdb->priority) | |
4b313269 | 1809 | return 1; |
ed161dab | 1810 | if (cda->priority < cdb->priority) |
4b313269 | 1811 | return -1; |
ed161dab | 1812 | if (cda->position > cdb->position) |
4b313269 | 1813 | return 1; |
ed161dab | 1814 | if (cda->position < cdb->position) |
4b313269 | 1815 | return -1; |
1816 | return 0; | |
1817 | } | |
1818 | ||
1819 | static void | |
ed161dab | 1820 | finalize_ctors () |
4b313269 | 1821 | { |
1822 | unsigned int i; | |
ed161dab | 1823 | cdtor_record *elt; |
4b313269 | 1824 | |
8f74ae7b | 1825 | if (MACHOPIC_INDIRECT) |
92e4ba7d | 1826 | switch_to_section (darwin_sections[mod_init_section]); |
01d15dc5 | 1827 | else |
92e4ba7d | 1828 | switch_to_section (darwin_sections[constructor_section]); |
01d15dc5 | 1829 | |
4b313269 | 1830 | if (vec_safe_length (ctors) > 1) |
ed161dab | 1831 | ctors->qsort (sort_cdtor_records); |
4b313269 | 1832 | FOR_EACH_VEC_SAFE_ELT (ctors, i, elt) |
1833 | { | |
1834 | assemble_align (POINTER_SIZE); | |
1835 | assemble_integer (elt->symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); | |
1836 | } | |
01d15dc5 | 1837 | } |
1838 | ||
ed161dab | 1839 | static void |
1840 | finalize_dtors () | |
01d15dc5 | 1841 | { |
ed161dab | 1842 | unsigned int i; |
1843 | cdtor_record *elt; | |
1844 | ||
8f74ae7b | 1845 | if (MACHOPIC_INDIRECT) |
92e4ba7d | 1846 | switch_to_section (darwin_sections[mod_term_section]); |
01d15dc5 | 1847 | else |
92e4ba7d | 1848 | switch_to_section (darwin_sections[destructor_section]); |
01d15dc5 | 1849 | |
ed161dab | 1850 | if (vec_safe_length (dtors) > 1) |
1851 | dtors->qsort (sort_cdtor_records); | |
1852 | FOR_EACH_VEC_SAFE_ELT (dtors, i, elt) | |
1853 | { | |
1854 | assemble_align (POINTER_SIZE); | |
1855 | assemble_integer (elt->symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); | |
1856 | } | |
01d15dc5 | 1857 | } |
1f3233d1 | 1858 | |
67c1e638 | 1859 | void |
b40da9a7 | 1860 | darwin_globalize_label (FILE *stream, const char *name) |
67c1e638 | 1861 | { |
1862 | if (!!strncmp (name, "_OBJC_", 6)) | |
1863 | default_globalize_label (stream, name); | |
1864 | } | |
1865 | ||
32e31f06 | 1866 | /* This routine returns non-zero if 'name' starts with the special objective-c |
1867 | anonymous file-scope static name. It accommodates c++'s mangling of such | |
1868 | symbols (in this case the symbols will have form _ZL{d}*_OBJC_* d=digit). */ | |
1869 | ||
1870 | int | |
1871 | darwin_label_is_anonymous_local_objc_name (const char *name) | |
1872 | { | |
1873 | const unsigned char *p = (const unsigned char *) name; | |
1874 | if (*p != '_') | |
1875 | return 0; | |
1876 | if (p[1] == 'Z' && p[2] == 'L') | |
1877 | { | |
1878 | p += 3; | |
1879 | while (*p >= '0' && *p <= '9') | |
1880 | p++; | |
1881 | } | |
1882 | return (!strncmp ((const char *)p, "_OBJC_", 6)); | |
1883 | } | |
1884 | ||
13e2f0a0 | 1885 | /* LTO support for Mach-O. |
23433d72 | 1886 | |
13e2f0a0 | 1887 | This version uses three mach-o sections to encapsulate the (unlimited |
1888 | number of) lto sections. | |
23433d72 | 1889 | |
13e2f0a0 | 1890 | __GNU_LTO, __lto_sections contains the concatented GNU LTO section data. |
1891 | __GNU_LTO, __section_names contains the GNU LTO section names. | |
1892 | __GNU_LTO, __section_index contains an array of values that index these. | |
23433d72 | 1893 | |
13e2f0a0 | 1894 | Indexed thus: |
1895 | <section offset from the start of __GNU_LTO, __lto_sections>, | |
1896 | <section length> | |
1897 | <name offset from the start of __GNU_LTO, __section_names, | |
1898 | <name length>. | |
1899 | ||
1900 | At present, for both m32 and m64 mach-o files each of these fields is | |
1901 | represented by a uint32_t. This is because, AFAICT, a mach-o object | |
1902 | cannot exceed 4Gb because the section_64 offset field (see below) is 32bits. | |
1903 | ||
1904 | uint32_t offset; | |
1905 | "offset An integer specifying the offset to this section in the file." */ | |
1906 | ||
1907 | /* Count lto section numbers. */ | |
1908 | static unsigned int lto_section_num = 0; | |
1909 | ||
1910 | /* A vector of information about LTO sections, at present, we only have | |
1911 | the name. TODO: see if we can get the data length somehow. */ | |
1912 | typedef struct GTY (()) darwin_lto_section_e { | |
1913 | const char *sectname; | |
1914 | } darwin_lto_section_e ; | |
13e2f0a0 | 1915 | |
f1f41a6c | 1916 | static GTY (()) vec<darwin_lto_section_e, va_gc> *lto_section_names; |
13e2f0a0 | 1917 | |
13e2f0a0 | 1918 | /* Section wrapper scheme (used here to wrap the unlimited number of LTO |
1919 | sections into three Mach-O ones). | |
1920 | NOTE: These names MUST be kept in sync with those in | |
1921 | libiberty/simple-object-mach-o. */ | |
1922 | #define LTO_SECTS_SECTION "__wrapper_sects" | |
1923 | #define LTO_NAMES_SECTION "__wrapper_names" | |
1924 | #define LTO_INDEX_SECTION "__wrapper_index" | |
23433d72 | 1925 | |
1926 | /* File to temporarily store LTO data. This is appended to asm_out_file | |
1927 | in darwin_end_file. */ | |
1928 | static FILE *lto_asm_out_file, *saved_asm_out_file; | |
1929 | static char *lto_asm_out_name; | |
7c7883aa | 1930 | static enum debug_info_levels saved_debug_info_level; |
23433d72 | 1931 | |
1932 | /* Prepare asm_out_file for LTO output. For darwin, this means hiding | |
1933 | asm_out_file and switching to an alternative output file. */ | |
1934 | void | |
1935 | darwin_asm_lto_start (void) | |
1936 | { | |
1937 | gcc_assert (! saved_asm_out_file); | |
1938 | saved_asm_out_file = asm_out_file; | |
7c7883aa | 1939 | saved_debug_info_level = debug_info_level; |
1940 | debug_info_level = DINFO_LEVEL_NONE; | |
23433d72 | 1941 | if (! lto_asm_out_name) |
1942 | lto_asm_out_name = make_temp_file (".lto.s"); | |
1943 | lto_asm_out_file = fopen (lto_asm_out_name, "a"); | |
1944 | if (lto_asm_out_file == NULL) | |
c05be867 | 1945 | fatal_error (input_location, |
1946 | "failed to open temporary file %s for LTO output", | |
23433d72 | 1947 | lto_asm_out_name); |
1948 | asm_out_file = lto_asm_out_file; | |
1949 | } | |
1950 | ||
1951 | /* Restore asm_out_file. */ | |
1952 | void | |
1953 | darwin_asm_lto_end (void) | |
1954 | { | |
1955 | gcc_assert (saved_asm_out_file); | |
1956 | fclose (lto_asm_out_file); | |
1957 | asm_out_file = saved_asm_out_file; | |
1958 | saved_asm_out_file = NULL; | |
7c7883aa | 1959 | debug_info_level = saved_debug_info_level; |
23433d72 | 1960 | } |
1961 | ||
edea89b9 | 1962 | static void |
7b53e714 | 1963 | darwin_asm_dwarf_section (const char *name, unsigned int flags, |
1964 | tree decl, bool is_for_lto); | |
edea89b9 | 1965 | |
1966 | /* Called for the TARGET_ASM_NAMED_SECTION hook. */ | |
1967 | ||
2f9fc8ef | 1968 | void |
b215c058 | 1969 | darwin_asm_named_section (const char *name, |
23433d72 | 1970 | unsigned int flags, |
537cd941 | 1971 | tree decl ATTRIBUTE_UNUSED) |
2f9fc8ef | 1972 | { |
13e2f0a0 | 1973 | /* LTO sections go in a special section that encapsulates the (unlimited) |
1974 | number of GNU LTO sections within a single mach-o one. */ | |
23433d72 | 1975 | if (strncmp (name, LTO_SECTION_NAME_PREFIX, |
1976 | strlen (LTO_SECTION_NAME_PREFIX)) == 0) | |
1977 | { | |
13e2f0a0 | 1978 | darwin_lto_section_e e; |
23433d72 | 1979 | /* We expect certain flags to be set... */ |
1980 | gcc_assert ((flags & (SECTION_DEBUG | SECTION_NAMED)) | |
1981 | == (SECTION_DEBUG | SECTION_NAMED)); | |
1982 | ||
13e2f0a0 | 1983 | /* Switch to our combined section. */ |
1984 | fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n", | |
1985 | LTO_SEGMENT_NAME, LTO_SECTS_SECTION); | |
1986 | /* Output a label for the start of this sub-section. */ | |
1987 | fprintf (asm_out_file, "L_GNU_LTO%d:\t;# %s\n", | |
1988 | lto_section_num, name); | |
1989 | /* We have to jump through hoops to get the values of the intra-section | |
1990 | offsets... */ | |
1991 | fprintf (asm_out_file, "\t.set L$gnu$lto$offs%d,L_GNU_LTO%d-L_GNU_LTO0\n", | |
1992 | lto_section_num, lto_section_num); | |
1993 | fprintf (asm_out_file, | |
1994 | "\t.set L$gnu$lto$size%d,L_GNU_LTO%d-L_GNU_LTO%d\n", | |
1995 | lto_section_num, lto_section_num+1, lto_section_num); | |
1996 | lto_section_num++; | |
1997 | e.sectname = xstrdup (name); | |
1998 | /* Keep the names, we'll need to make a table later. | |
1999 | TODO: check that we do not revisit sections, that would break | |
2000 | the assumption of how this is done. */ | |
2001 | if (lto_section_names == NULL) | |
f1f41a6c | 2002 | vec_alloc (lto_section_names, 16); |
2003 | vec_safe_push (lto_section_names, e); | |
13e2f0a0 | 2004 | } |
edea89b9 | 2005 | else if (strncmp (name, "__DWARF,", 8) == 0) |
7b53e714 | 2006 | darwin_asm_dwarf_section (name, flags, decl, false); |
2007 | else if (strncmp (name, "__GNU_DWARF_LTO,", 16) == 0) | |
2008 | darwin_asm_dwarf_section (name, flags, decl, true); | |
23433d72 | 2009 | else |
2010 | fprintf (asm_out_file, "\t.section %s\n", name); | |
2f9fc8ef | 2011 | } |
2012 | ||
b215c058 | 2013 | void |
1dc74225 | 2014 | darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED) |
2f9fc8ef | 2015 | { |
1dc74225 | 2016 | /* Darwin does not use unique sections. */ |
2f9fc8ef | 2017 | } |
2018 | ||
5b182752 | 2019 | /* Handle __attribute__ ((apple_kext_compatibility)). |
2020 | This only applies to darwin kexts for 2.95 compatibility -- it shrinks the | |
2021 | vtable for classes with this attribute (and their descendants) by not | |
2022 | outputting the new 3.0 nondeleting destructor. This means that such | |
2023 | objects CANNOT be allocated on the stack or as globals UNLESS they have | |
2024 | a completely empty `operator delete'. | |
2025 | Luckily, this fits in with the Darwin kext model. | |
2026 | ||
2027 | This attribute also disables gcc3's potential overlaying of derived | |
2028 | class data members on the padding at the end of the base class. */ | |
2029 | ||
2030 | tree | |
2031 | darwin_handle_kext_attribute (tree *node, tree name, | |
2032 | tree args ATTRIBUTE_UNUSED, | |
2033 | int flags ATTRIBUTE_UNUSED, | |
2034 | bool *no_add_attrs) | |
2035 | { | |
2036 | /* APPLE KEXT stuff -- only applies with pure static C++ code. */ | |
2037 | if (! TARGET_KEXTABI) | |
2038 | { | |
67a779df | 2039 | warning (0, "%qE 2.95 vtable-compatibility attribute applies " |
2040 | "only when compiling a kext", name); | |
5b182752 | 2041 | |
2042 | *no_add_attrs = true; | |
2043 | } | |
2044 | else if (TREE_CODE (*node) != RECORD_TYPE) | |
2045 | { | |
67a779df | 2046 | warning (0, "%qE 2.95 vtable-compatibility attribute applies " |
2047 | "only to C++ classes", name); | |
5b182752 | 2048 | |
2049 | *no_add_attrs = true; | |
2050 | } | |
2051 | ||
2052 | return NULL_TREE; | |
2053 | } | |
2054 | ||
975d636c | 2055 | /* Handle a "weak_import" attribute; arguments as in |
2056 | struct attribute_spec.handler. */ | |
2057 | ||
2058 | tree | |
2059 | darwin_handle_weak_import_attribute (tree *node, tree name, | |
2060 | tree ARG_UNUSED (args), | |
2061 | int ARG_UNUSED (flags), | |
2062 | bool * no_add_attrs) | |
2063 | { | |
d0ddd548 | 2064 | if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL) |
975d636c | 2065 | { |
67a779df | 2066 | warning (OPT_Wattributes, "%qE attribute ignored", |
2067 | name); | |
975d636c | 2068 | *no_add_attrs = true; |
2069 | } | |
2070 | else | |
2071 | declare_weak (*node); | |
2072 | ||
2073 | return NULL_TREE; | |
2074 | } | |
a3952a36 | 2075 | |
b215c058 | 2076 | /* Emit a label for an FDE, making it global and/or weak if appropriate. |
ef1074f7 | 2077 | The third parameter is nonzero if this is for exception handling. |
2078 | The fourth parameter is nonzero if this is just a placeholder for an | |
2f9fc8ef | 2079 | FDE that we are omitting. */ |
ef1074f7 | 2080 | |
b215c058 | 2081 | void |
ef1074f7 | 2082 | darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty) |
2f9fc8ef | 2083 | { |
9e09909d | 2084 | char *lab ; |
2085 | char buf[32]; | |
2086 | static int invok_count = 0; | |
2087 | static tree last_fun_decl = NULL_TREE; | |
2088 | ||
2089 | /* We use the linker to emit the .eh labels for Darwin 9 and above. */ | |
2090 | if (! for_eh || generating_for_darwin_version >= 9) | |
d08d29c0 | 2091 | return; |
2f9fc8ef | 2092 | |
9e09909d | 2093 | /* FIXME: This only works when the eh for all sections of a function is |
2094 | emitted at the same time. If that changes, we would need to use a lookup | |
2095 | table of some form to determine what to do. Also, we should emit the | |
2096 | unadorned label for the partition containing the public label for a | |
2097 | function. This is of limited use, probably, since we do not currently | |
2098 | enable partitioning. */ | |
2099 | strcpy (buf, ".eh"); | |
2100 | if (decl && TREE_CODE (decl) == FUNCTION_DECL) | |
2101 | { | |
2102 | if (decl == last_fun_decl) | |
2103 | { | |
2104 | invok_count++; | |
2105 | snprintf (buf, 31, "$$part$$%d.eh", invok_count); | |
2106 | } | |
2107 | else | |
2108 | { | |
2109 | last_fun_decl = decl; | |
2110 | invok_count = 0; | |
2111 | } | |
2112 | } | |
2113 | ||
2114 | lab = concat (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)), buf, NULL); | |
2f9fc8ef | 2115 | |
2116 | if (TREE_PUBLIC (decl)) | |
e8f535c2 | 2117 | { |
2118 | targetm.asm_out.globalize_label (file, lab); | |
2119 | if (DECL_VISIBILITY (decl) == VISIBILITY_HIDDEN) | |
2120 | { | |
2121 | fputs ("\t.private_extern ", file); | |
2122 | assemble_name (file, lab); | |
2123 | fputc ('\n', file); | |
2124 | } | |
2125 | } | |
2f9fc8ef | 2126 | |
1dc74225 | 2127 | if (DECL_WEAK (decl)) |
e8f535c2 | 2128 | { |
2129 | fputs ("\t.weak_definition ", file); | |
2130 | assemble_name (file, lab); | |
2131 | fputc ('\n', file); | |
2132 | } | |
2f9fc8ef | 2133 | |
e8f535c2 | 2134 | assemble_name (file, lab); |
2f9fc8ef | 2135 | if (empty) |
a3952a36 | 2136 | { |
e8f535c2 | 2137 | fputs (" = 0\n", file); |
a3952a36 | 2138 | |
2139 | /* Mark the absolute .eh and .eh1 style labels as needed to | |
2140 | ensure that we don't dead code strip them and keep such | |
2141 | labels from another instantiation point until we can fix this | |
2142 | properly with group comdat support. */ | |
e8f535c2 | 2143 | darwin_mark_decl_preserved (lab); |
a3952a36 | 2144 | } |
2f9fc8ef | 2145 | else |
e8f535c2 | 2146 | fputs (":\n", file); |
2f9fc8ef | 2147 | |
2148 | free (lab); | |
2149 | } | |
2150 | ||
b215c058 | 2151 | static GTY(()) unsigned long except_table_label_num; |
2152 | ||
2153 | void | |
2154 | darwin_emit_except_table_label (FILE *file) | |
2155 | { | |
2156 | char section_start_label[30]; | |
2157 | ||
2158 | ASM_GENERATE_INTERNAL_LABEL (section_start_label, "GCC_except_table", | |
2159 | except_table_label_num++); | |
2160 | ASM_OUTPUT_LABEL (file, section_start_label); | |
2161 | } | |
2162 | /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */ | |
ef1074f7 | 2163 | |
2f9fc8ef | 2164 | void |
2165 | darwin_non_lazy_pcrel (FILE *file, rtx addr) | |
2166 | { | |
2f9fc8ef | 2167 | const char *nlp_name; |
2168 | ||
27d2baef | 2169 | gcc_assert (GET_CODE (addr) == SYMBOL_REF); |
2f9fc8ef | 2170 | |
ab06d2ff | 2171 | nlp_name = machopic_indirection_name (addr, /*stub_p=*/false); |
2f9fc8ef | 2172 | fputs ("\t.long\t", file); |
2173 | ASM_OUTPUT_LABELREF (file, nlp_name); | |
2174 | fputs ("-.", file); | |
2175 | } | |
2176 | ||
8e79e9d4 | 2177 | /* If this is uncommented, details of each allocation will be printed |
2178 | in the asm right before the actual code. WARNING - this will cause some | |
2179 | test-suite fails (since the printout will contain items that some tests | |
2180 | are not expecting) -- so don't leave it on by default (it bloats the | |
2181 | asm too). */ | |
2182 | /*#define DEBUG_DARWIN_MEM_ALLOCATORS*/ | |
2183 | ||
2184 | /* The first two of these routines are ostensibly just intended to put | |
2185 | names into the asm. However, they are both hijacked in order to ensure | |
2186 | that zero-sized items do not make their way into the output. Consequently, | |
2187 | we also need to make these participate in provisions for dealing with | |
2188 | such items in section anchors. */ | |
2189 | ||
2190 | /* The implementation of ASM_DECLARE_OBJECT_NAME. */ | |
2191 | /* The RTTI data (e.g., __ti4name) is common and public (and static), | |
2192 | but it does need to be referenced via indirect PIC data pointers. | |
2193 | The machopic_define_symbol calls are telling the machopic subsystem | |
2194 | that the name *is* defined in this module, so it doesn't need to | |
2195 | make them indirect. */ | |
2196 | void | |
2197 | darwin_asm_declare_object_name (FILE *file, | |
2198 | const char *nam, tree decl) | |
2199 | { | |
2200 | const char *xname = nam; | |
2201 | unsigned HOST_WIDE_INT size; | |
2202 | bool local_def, weak; | |
2203 | ||
2204 | weak = (DECL_P (decl) | |
2205 | && DECL_WEAK (decl) | |
2206 | && !lookup_attribute ("weak_import", | |
2207 | DECL_ATTRIBUTES (decl))); | |
2208 | ||
2209 | local_def = DECL_INITIAL (decl) || (TREE_STATIC (decl) | |
2210 | && (!DECL_COMMON (decl) | |
2211 | || !TREE_PUBLIC (decl))); | |
2212 | ||
2213 | if (GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF) | |
2214 | xname = IDENTIFIER_POINTER (DECL_NAME (decl)); | |
2215 | ||
2216 | if (local_def) | |
2217 | { | |
2218 | (* targetm.encode_section_info) (decl, DECL_RTL (decl), false); | |
2219 | if (!weak) | |
2220 | machopic_define_symbol (DECL_RTL (decl)); | |
2221 | } | |
2222 | ||
e913b5cd | 2223 | size = tree_to_uhwi (DECL_SIZE_UNIT (decl)); |
8e79e9d4 | 2224 | |
2225 | #ifdef DEBUG_DARWIN_MEM_ALLOCATORS | |
2226 | fprintf (file, "# dadon: %s %s (%llu, %u) local %d weak %d" | |
2227 | " stat %d com %d pub %d t-const %d t-ro %d init %lx\n", | |
2228 | xname, (TREE_CODE (decl) == VAR_DECL?"var":"const"), | |
2229 | (unsigned long long)size, DECL_ALIGN (decl), local_def, | |
2230 | DECL_WEAK (decl), TREE_STATIC (decl), DECL_COMMON (decl), | |
2231 | TREE_PUBLIC (decl), TREE_CONSTANT (decl), TREE_READONLY (decl), | |
2232 | (unsigned long)DECL_INITIAL (decl)); | |
2233 | #endif | |
2234 | ||
2235 | /* Darwin needs help to support local zero-sized objects. | |
2236 | They must be made at least one byte, and the section containing must be | |
2237 | marked as unsuitable for section-anchors (see storage allocators below). | |
2238 | ||
2239 | For non-zero objects this output is handled by varasm.c. | |
2240 | */ | |
2241 | if (!size) | |
2242 | { | |
2243 | unsigned int l2align = 0; | |
2244 | ||
a967a7ec | 2245 | /* The align must be honored, even for zero-sized. */ |
8e79e9d4 | 2246 | if (DECL_ALIGN (decl)) |
2247 | { | |
2248 | l2align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT); | |
2249 | fprintf (file, "\t.align\t%u\n", l2align); | |
2250 | } | |
2251 | ||
2252 | ASM_OUTPUT_LABEL (file, xname); | |
2253 | size = 1; | |
f03df321 | 2254 | fprintf (file, "\t.space\t" HOST_WIDE_INT_PRINT_UNSIGNED"\n", size); |
8e79e9d4 | 2255 | |
2256 | /* Check that we've correctly picked up the zero-sized item and placed it | |
2257 | properly. */ | |
2258 | gcc_assert ((!DARWIN_SECTION_ANCHORS || !flag_section_anchors) | |
2259 | || (in_section | |
2260 | && (in_section->common.flags & SECTION_NO_ANCHOR))); | |
2261 | } | |
2262 | else | |
2263 | ASM_OUTPUT_LABEL (file, xname); | |
2264 | } | |
427eb138 | 2265 | |
8e79e9d4 | 2266 | /* The implementation of ASM_DECLARE_CONSTANT_NAME. */ |
427eb138 | 2267 | void |
2268 | darwin_asm_declare_constant_name (FILE *file, const char *name, | |
2269 | const_tree exp ATTRIBUTE_UNUSED, | |
2270 | HOST_WIDE_INT size) | |
2271 | { | |
2272 | assemble_label (file, name); | |
8e79e9d4 | 2273 | /* As for other items, we need at least one byte. */ |
2274 | if (!size) | |
2275 | { | |
2276 | fputs ("\t.space\t1\n", file); | |
2277 | /* Check that we've correctly picked up the zero-sized item and placed it | |
2278 | properly. */ | |
2279 | gcc_assert ((!DARWIN_SECTION_ANCHORS || !flag_section_anchors) | |
2280 | || (in_section | |
2281 | && (in_section->common.flags & SECTION_NO_ANCHOR))); | |
2282 | } | |
2283 | } | |
2284 | ||
2285 | /* Darwin storage allocators. | |
2286 | ||
2287 | Zerofill sections are desirable for large blank data since, otherwise, these | |
2288 | data bloat objects (PR33210). | |
2289 | ||
2290 | However, section anchors don't work in .zerofill sections (one cannot switch | |
2291 | to a zerofill section). Ergo, for Darwin targets using section anchors we need | |
2292 | to put (at least some) data into 'normal' switchable sections. | |
2293 | ||
2294 | Here we set a relatively arbitrary value for the size of an object to trigger | |
2295 | zerofill when section anchors are enabled (anything bigger than a page for | |
2296 | current Darwin implementations). FIXME: there ought to be some objective way | |
2297 | to make this choice. | |
2298 | ||
2299 | When section anchor are off this is ignored anyway. */ | |
2300 | ||
2301 | #define BYTES_ZFILL 4096 | |
2302 | ||
2303 | /* Emit a chunk of data for items coalesced by the linker. */ | |
2304 | static void | |
2305 | darwin_emit_weak_or_comdat (FILE *fp, tree decl, const char *name, | |
2306 | unsigned HOST_WIDE_INT size, | |
f199808c | 2307 | bool use_coal, |
8e79e9d4 | 2308 | unsigned int align) |
2309 | { | |
f199808c | 2310 | /* Since the sections used here are coalesced, they will not be eligible |
2311 | for section anchors, and therefore we don't need to break that out. | |
2312 | CHECKME: for modern linker on PowerPC. */ | |
8e79e9d4 | 2313 | if (TREE_READONLY (decl) || TREE_CONSTANT (decl)) |
f199808c | 2314 | switch_to_section (use_coal ? darwin_sections[const_data_coal_section] |
2315 | : darwin_sections[const_data_section]); | |
8e79e9d4 | 2316 | else |
f199808c | 2317 | switch_to_section (use_coal ? darwin_sections[data_coal_section] |
2318 | : data_section); | |
8e79e9d4 | 2319 | |
2320 | /* To be consistent, we'll allow darwin_asm_declare_object_name to assemble | |
2321 | the align info for zero-sized items... but do it here otherwise. */ | |
2322 | if (size && align) | |
2323 | fprintf (fp, "\t.align\t%d\n", floor_log2 (align / BITS_PER_UNIT)); | |
2324 | ||
2325 | if (TREE_PUBLIC (decl)) | |
2326 | darwin_globalize_label (fp, name); | |
2327 | ||
2328 | /* ... and we let it deal with outputting one byte of zero for them too. */ | |
2329 | darwin_asm_declare_object_name (fp, name, decl); | |
2330 | if (size) | |
2331 | assemble_zeros (size); | |
2332 | } | |
2333 | ||
267785bc | 2334 | /* Emit a chunk of data for ObjC meta-data that got placed in BSS erroneously. */ |
2335 | static void | |
2336 | darwin_emit_objc_zeroed (FILE *fp, tree decl, const char *name, | |
2337 | unsigned HOST_WIDE_INT size, | |
2338 | unsigned int align, tree meta) | |
2339 | { | |
2340 | section *ocs = data_section; | |
2341 | ||
2342 | if (TREE_PURPOSE (meta) == get_identifier("OBJC2META")) | |
2343 | ocs = darwin_objc2_section (decl, meta, ocs); | |
2344 | else | |
2345 | ocs = darwin_objc1_section (decl, meta, ocs); | |
2346 | ||
2347 | switch_to_section (ocs); | |
2348 | ||
2349 | /* We shall declare that zero-sized meta-data are not valid (yet). */ | |
2350 | gcc_assert (size); | |
2351 | fprintf (fp, "\t.align\t%d\n", floor_log2 (align / BITS_PER_UNIT)); | |
2352 | ||
2353 | /* ... and we let it deal with outputting one byte of zero for them too. */ | |
2354 | darwin_asm_declare_object_name (fp, name, decl); | |
2355 | assemble_zeros (size); | |
2356 | } | |
2357 | ||
8e79e9d4 | 2358 | /* This routine emits 'local' storage: |
2359 | ||
2360 | When Section Anchors are off this routine emits .zerofill commands in | |
2361 | sections named for their alignment. | |
2362 | ||
2363 | When Section Anchors are on, smaller (non-zero-sized) items are placed in | |
2364 | the .static_data section so that the section anchoring system can see them. | |
2365 | Larger items are still placed in .zerofill sections, addressing PR33210. | |
2366 | The routine has no checking - it is all assumed to be done by the caller. | |
2367 | */ | |
2368 | static void | |
2369 | darwin_emit_local_bss (FILE *fp, tree decl, const char *name, | |
2370 | unsigned HOST_WIDE_INT size, | |
2371 | unsigned int l2align) | |
2372 | { | |
2373 | /* FIXME: We have a fudge to make this work with Java even when the target does | |
2374 | not use sections anchors -- Java seems to need at least one small item in a | |
2375 | non-zerofill segment. */ | |
2376 | if ((DARWIN_SECTION_ANCHORS && flag_section_anchors && size < BYTES_ZFILL) | |
2377 | || (size && size <= 2)) | |
2378 | { | |
2379 | /* Put smaller objects in _static_data, where the section anchors system | |
2380 | can get them. | |
2381 | However, if they are zero-sized punt them to yet a different section | |
2382 | (that is not allowed to participate in anchoring). */ | |
2383 | if (!size) | |
2384 | { | |
2385 | fputs ("\t.section\t__DATA,__zobj_bss\n", fp); | |
2386 | in_section = darwin_sections[zobj_bss_section]; | |
2387 | size = 1; | |
2388 | } | |
2389 | else | |
2390 | { | |
2391 | fputs ("\t.static_data\n", fp); | |
2392 | in_section = darwin_sections[static_data_section]; | |
2393 | } | |
2394 | ||
2395 | if (l2align) | |
2396 | fprintf (fp, "\t.align\t%u\n", l2align); | |
2397 | ||
2398 | assemble_name (fp, name); | |
f03df321 | 2399 | fprintf (fp, ":\n\t.space\t" HOST_WIDE_INT_PRINT_UNSIGNED"\n", size); |
8e79e9d4 | 2400 | } |
2401 | else | |
2402 | { | |
2403 | /* When we are on a non-section anchor target, we can get zero-sized | |
2404 | items here. However, all we need to do is to bump them to one byte | |
2405 | and the section alignment will take care of the rest. */ | |
2406 | char secnam[64]; | |
2407 | unsigned int flags ; | |
2408 | snprintf (secnam, 64, "__DATA,__%sbss%u", ((size)?"":"zo_"), | |
2409 | (unsigned) l2align); | |
2410 | /* We can't anchor (yet, if ever) in zerofill sections, because we can't | |
2411 | switch to them and emit a label. */ | |
2412 | flags = SECTION_BSS|SECTION_WRITE|SECTION_NO_ANCHOR; | |
2413 | in_section = get_section (secnam, flags, NULL); | |
2414 | fprintf (fp, "\t.zerofill %s,", secnam); | |
2415 | assemble_name (fp, name); | |
2416 | if (!size) | |
2417 | size = 1; | |
2418 | ||
2419 | if (l2align) | |
f03df321 | 2420 | fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", |
8e79e9d4 | 2421 | size, (unsigned) l2align); |
2422 | else | |
f03df321 | 2423 | fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED"\n", size); |
8e79e9d4 | 2424 | } |
2425 | ||
2426 | (*targetm.encode_section_info) (decl, DECL_RTL (decl), false); | |
2427 | /* This is defined as a file-scope var, so we know to notify machopic. */ | |
2428 | machopic_define_symbol (DECL_RTL (decl)); | |
2429 | } | |
2430 | ||
2431 | /* Emit a chunk of common. */ | |
2432 | static void | |
2433 | darwin_emit_common (FILE *fp, const char *name, | |
2434 | unsigned HOST_WIDE_INT size, unsigned int align) | |
2435 | { | |
2436 | unsigned HOST_WIDE_INT rounded; | |
2437 | unsigned int l2align; | |
427eb138 | 2438 | |
8e79e9d4 | 2439 | /* Earlier systems complain if the alignment exceeds the page size. |
2440 | The magic number is 4096 * 8 - hard-coded for legacy systems. */ | |
2441 | if (!emit_aligned_common && (align > 32768UL)) | |
2442 | align = 4096UL; /* In units. */ | |
2443 | else | |
2444 | align /= BITS_PER_UNIT; | |
2445 | ||
2446 | /* Make sure we have a meaningful align. */ | |
2447 | if (!align) | |
2448 | align = 1; | |
2449 | ||
2450 | /* For earlier toolchains, we need to emit the var as a rounded size to | |
2451 | tell ld the alignment. */ | |
2452 | if (size < align) | |
2453 | rounded = align; | |
2454 | else | |
2455 | rounded = (size + (align-1)) & ~(align-1); | |
2456 | ||
2457 | l2align = floor_log2 (align); | |
2458 | gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT); | |
2459 | ||
2460 | in_section = comm_section; | |
2461 | /* We mustn't allow multiple public symbols to share an address when using | |
2462 | the normal OSX toolchain. */ | |
2463 | if (!size) | |
2464 | { | |
2465 | /* Put at least one byte. */ | |
2466 | size = 1; | |
2467 | /* This section can no longer participate in section anchoring. */ | |
2468 | comm_section->common.flags |= SECTION_NO_ANCHOR; | |
2469 | } | |
2470 | ||
2471 | fputs ("\t.comm\t", fp); | |
2472 | assemble_name (fp, name); | |
2473 | fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED, | |
2474 | emit_aligned_common?size:rounded); | |
2475 | if (l2align && emit_aligned_common) | |
2476 | fprintf (fp, ",%u", l2align); | |
2477 | fputs ("\n", fp); | |
2478 | } | |
2479 | ||
2480 | /* Output a var which is all zero - into aligned BSS sections, common, lcomm | |
2481 | or coalescable data sections (for weak or comdat) as appropriate. */ | |
2482 | ||
2483 | void | |
2484 | darwin_output_aligned_bss (FILE *fp, tree decl, const char *name, | |
2485 | unsigned HOST_WIDE_INT size, unsigned int align) | |
2486 | { | |
2487 | unsigned int l2align; | |
2488 | bool one, pub, weak; | |
267785bc | 2489 | tree meta; |
8e79e9d4 | 2490 | |
2491 | pub = TREE_PUBLIC (decl); | |
2492 | one = DECL_ONE_ONLY (decl); | |
2493 | weak = (DECL_P (decl) | |
2494 | && DECL_WEAK (decl) | |
2495 | && !lookup_attribute ("weak_import", | |
2496 | DECL_ATTRIBUTES (decl))); | |
2497 | ||
2498 | #ifdef DEBUG_DARWIN_MEM_ALLOCATORS | |
2499 | fprintf (fp, "# albss: %s (%lld,%d) ro %d cst %d stat %d com %d" | |
2500 | " pub %d weak %d one %d init %lx\n", | |
2501 | name, (long long)size, (int)align, TREE_READONLY (decl), | |
2502 | TREE_CONSTANT (decl), TREE_STATIC (decl), DECL_COMMON (decl), | |
2503 | pub, weak, one, (unsigned long)DECL_INITIAL (decl)); | |
2504 | #endif | |
2505 | ||
267785bc | 2506 | /* ObjC metadata can get put in BSS because varasm.c decides it's BSS |
2507 | before the target has a chance to comment. */ | |
2508 | if ((meta = is_objc_metadata (decl))) | |
2509 | { | |
2510 | darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta); | |
2511 | return; | |
2512 | } | |
2513 | ||
8e79e9d4 | 2514 | /* Check that any initializer is valid. */ |
2515 | gcc_assert ((DECL_INITIAL (decl) == NULL) | |
2516 | || (DECL_INITIAL (decl) == error_mark_node) | |
2517 | || initializer_zerop (DECL_INITIAL (decl))); | |
2518 | ||
2519 | gcc_assert (DECL_SECTION_NAME (decl) == NULL); | |
2520 | gcc_assert (!DECL_COMMON (decl)); | |
2521 | ||
2522 | /* Pick up the correct alignment. */ | |
2523 | if (!size || !align) | |
2524 | align = DECL_ALIGN (decl); | |
2525 | ||
2526 | l2align = floor_log2 (align / BITS_PER_UNIT); | |
2527 | gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT); | |
2528 | ||
2529 | last_assemble_variable_decl = decl; | |
2530 | ||
2531 | /* We would rather not have to check this here - but it seems that we might | |
2532 | be passed a decl that should be in coalesced space. */ | |
2533 | if (one || weak) | |
2534 | { | |
a967a7ec | 2535 | /* Weak or COMDAT objects are put in mergeable sections. */ |
8e79e9d4 | 2536 | darwin_emit_weak_or_comdat (fp, decl, name, size, |
f199808c | 2537 | ld_uses_coal_sects, DECL_ALIGN (decl)); |
8e79e9d4 | 2538 | return; |
2539 | } | |
2540 | ||
2541 | /* If this is not public, then emit according to local rules. */ | |
2542 | if (!pub) | |
2543 | { | |
2544 | darwin_emit_local_bss (fp, decl, name, size, l2align); | |
2545 | return; | |
2546 | } | |
2547 | ||
2548 | /* So we have a public symbol (small item fudge for Java, see above). */ | |
2549 | if ((DARWIN_SECTION_ANCHORS && flag_section_anchors && size < BYTES_ZFILL) | |
2550 | || (size && size <= 2)) | |
2551 | { | |
2552 | /* Put smaller objects in data, where the section anchors system can get | |
2553 | them. However, if they are zero-sized punt them to yet a different | |
2554 | section (that is not allowed to participate in anchoring). */ | |
2555 | if (!size) | |
2556 | { | |
2557 | fputs ("\t.section\t__DATA,__zobj_data\n", fp); | |
2558 | in_section = darwin_sections[zobj_data_section]; | |
2559 | size = 1; | |
2560 | } | |
2561 | else | |
2562 | { | |
2563 | fputs ("\t.data\n", fp); | |
2564 | in_section = data_section; | |
2565 | } | |
2566 | ||
2567 | if (l2align) | |
2568 | fprintf (fp, "\t.align\t%u\n", l2align); | |
2569 | ||
2570 | assemble_name (fp, name); | |
f03df321 | 2571 | fprintf (fp, ":\n\t.space\t" HOST_WIDE_INT_PRINT_UNSIGNED"\n", size); |
8e79e9d4 | 2572 | } |
2573 | else | |
2574 | { | |
2575 | char secnam[64]; | |
2576 | unsigned int flags ; | |
2577 | /* When we are on a non-section anchor target, we can get zero-sized | |
2578 | items here. However, all we need to do is to bump them to one byte | |
2579 | and the section alignment will take care of the rest. */ | |
2580 | snprintf (secnam, 64, "__DATA,__%spu_bss%u", ((size)?"":"zo_"), l2align); | |
2581 | ||
2582 | /* We can't anchor in zerofill sections, because we can't switch | |
2583 | to them and emit a label. */ | |
2584 | flags = SECTION_BSS|SECTION_WRITE|SECTION_NO_ANCHOR; | |
2585 | in_section = get_section (secnam, flags, NULL); | |
2586 | fprintf (fp, "\t.zerofill %s,", secnam); | |
2587 | assemble_name (fp, name); | |
2588 | if (!size) | |
2589 | size = 1; | |
2590 | ||
2591 | if (l2align) | |
f03df321 | 2592 | fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", size, l2align); |
8e79e9d4 | 2593 | else |
f03df321 | 2594 | fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED"\n", size); |
8e79e9d4 | 2595 | } |
2596 | (* targetm.encode_section_info) (decl, DECL_RTL (decl), false); | |
2597 | } | |
2598 | ||
2599 | /* Output a chunk of common, with alignment specified (where the target | |
2600 | supports this). */ | |
2601 | void | |
2602 | darwin_asm_output_aligned_decl_common (FILE *fp, tree decl, const char *name, | |
2603 | unsigned HOST_WIDE_INT size, | |
2604 | unsigned int align) | |
2605 | { | |
2606 | unsigned int l2align; | |
2607 | bool one, weak; | |
267785bc | 2608 | tree meta; |
2609 | ||
8e79e9d4 | 2610 | /* No corresponding var. */ |
2611 | if (decl==NULL) | |
2612 | { | |
2613 | #ifdef DEBUG_DARWIN_MEM_ALLOCATORS | |
2614 | fprintf (fp, "# adcom: %s (%d,%d) decl=0x0\n", name, (int)size, (int)align); | |
2615 | #endif | |
2616 | darwin_emit_common (fp, name, size, align); | |
2617 | return; | |
2618 | } | |
2619 | ||
2620 | one = DECL_ONE_ONLY (decl); | |
2621 | weak = (DECL_P (decl) | |
2622 | && DECL_WEAK (decl) | |
2623 | && !lookup_attribute ("weak_import", | |
2624 | DECL_ATTRIBUTES (decl))); | |
2625 | ||
2626 | #ifdef DEBUG_DARWIN_MEM_ALLOCATORS | |
2627 | fprintf (fp, "# adcom: %s (%lld,%d) ro %d cst %d stat %d com %d pub %d" | |
2628 | " weak %d one %d init %lx\n", | |
2629 | name, (long long)size, (int)align, TREE_READONLY (decl), | |
2630 | TREE_CONSTANT (decl), TREE_STATIC (decl), DECL_COMMON (decl), | |
2631 | TREE_PUBLIC (decl), weak, one, (unsigned long)DECL_INITIAL (decl)); | |
2632 | #endif | |
2633 | ||
267785bc | 2634 | /* ObjC metadata can get put in BSS because varasm.c decides it's BSS |
2635 | before the target has a chance to comment. */ | |
2636 | if ((meta = is_objc_metadata (decl))) | |
2637 | { | |
2638 | darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta); | |
2639 | return; | |
2640 | } | |
2641 | ||
8e79e9d4 | 2642 | /* We shouldn't be messing with this if the decl has a section name. */ |
2643 | gcc_assert (DECL_SECTION_NAME (decl) == NULL); | |
2644 | ||
2645 | /* We would rather not have to check this here - but it seems that we might | |
2646 | be passed a decl that should be in coalesced space. */ | |
2647 | if (one || weak) | |
2648 | { | |
2649 | /* Weak or COMDAT objects are put in mergable sections. */ | |
2650 | darwin_emit_weak_or_comdat (fp, decl, name, size, | |
f199808c | 2651 | ld_uses_coal_sects, DECL_ALIGN (decl)); |
8e79e9d4 | 2652 | return; |
2653 | } | |
2654 | ||
2655 | /* We should only get here for DECL_COMMON, with a zero init (and, in | |
2656 | principle, only for public symbols too - although we deal with local | |
2657 | ones below). */ | |
2658 | ||
2659 | /* Check the initializer is OK. */ | |
2660 | gcc_assert (DECL_COMMON (decl) | |
2661 | && ((DECL_INITIAL (decl) == NULL) | |
2662 | || (DECL_INITIAL (decl) == error_mark_node) | |
2663 | || initializer_zerop (DECL_INITIAL (decl)))); | |
2664 | ||
2665 | last_assemble_variable_decl = decl; | |
2666 | ||
2667 | if (!size || !align) | |
2668 | align = DECL_ALIGN (decl); | |
2669 | ||
2670 | l2align = floor_log2 (align / BITS_PER_UNIT); | |
2671 | /* Check we aren't asking for more aligment than the platform allows. */ | |
2672 | gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT); | |
2673 | ||
2674 | if (TREE_PUBLIC (decl) != 0) | |
2675 | darwin_emit_common (fp, name, size, align); | |
2676 | else | |
2677 | darwin_emit_local_bss (fp, decl, name, size, l2align); | |
2678 | } | |
2679 | ||
2680 | /* Output a chunk of BSS with alignment specfied. */ | |
2681 | void | |
2682 | darwin_asm_output_aligned_decl_local (FILE *fp, tree decl, const char *name, | |
2683 | unsigned HOST_WIDE_INT size, | |
2684 | unsigned int align) | |
2685 | { | |
2686 | unsigned long l2align; | |
2687 | bool one, weak; | |
267785bc | 2688 | tree meta; |
8e79e9d4 | 2689 | |
2690 | one = DECL_ONE_ONLY (decl); | |
2691 | weak = (DECL_P (decl) | |
2692 | && DECL_WEAK (decl) | |
2693 | && !lookup_attribute ("weak_import", | |
2694 | DECL_ATTRIBUTES (decl))); | |
2695 | ||
2696 | #ifdef DEBUG_DARWIN_MEM_ALLOCATORS | |
2697 | fprintf (fp, "# adloc: %s (%lld,%d) ro %d cst %d stat %d one %d pub %d" | |
2698 | " weak %d init %lx\n", | |
2699 | name, (long long)size, (int)align, TREE_READONLY (decl), | |
2700 | TREE_CONSTANT (decl), TREE_STATIC (decl), one, TREE_PUBLIC (decl), | |
2701 | weak , (unsigned long)DECL_INITIAL (decl)); | |
2702 | #endif | |
2703 | ||
267785bc | 2704 | /* ObjC metadata can get put in BSS because varasm.c decides it's BSS |
2705 | before the target has a chance to comment. */ | |
2706 | if ((meta = is_objc_metadata (decl))) | |
2707 | { | |
2708 | darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta); | |
2709 | return; | |
2710 | } | |
2711 | ||
8e79e9d4 | 2712 | /* We shouldn't be messing with this if the decl has a section name. */ |
2713 | gcc_assert (DECL_SECTION_NAME (decl) == NULL); | |
2714 | ||
2715 | /* We would rather not have to check this here - but it seems that we might | |
2716 | be passed a decl that should be in coalesced space. */ | |
2717 | if (one || weak) | |
2718 | { | |
2719 | /* Weak or COMDAT objects are put in mergable sections. */ | |
2720 | darwin_emit_weak_or_comdat (fp, decl, name, size, | |
f199808c | 2721 | ld_uses_coal_sects, DECL_ALIGN (decl)); |
8e79e9d4 | 2722 | return; |
2723 | } | |
2724 | ||
2725 | /* .. and it should be suitable for placement in local mem. */ | |
2726 | gcc_assert(!TREE_PUBLIC (decl) && !DECL_COMMON (decl)); | |
2727 | /* .. and any initializer must be all-zero. */ | |
2728 | gcc_assert ((DECL_INITIAL (decl) == NULL) | |
2729 | || (DECL_INITIAL (decl) == error_mark_node) | |
2730 | || initializer_zerop (DECL_INITIAL (decl))); | |
2731 | ||
2732 | last_assemble_variable_decl = decl; | |
2733 | ||
2734 | if (!size || !align) | |
2735 | align = DECL_ALIGN (decl); | |
2736 | ||
2737 | l2align = floor_log2 (align / BITS_PER_UNIT); | |
2738 | gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT); | |
2739 | ||
2740 | darwin_emit_local_bss (fp, decl, name, size, l2align); | |
427eb138 | 2741 | } |
2742 | ||
2c5b6111 | 2743 | /* Emit an assembler directive to set visibility for a symbol. The |
2744 | only supported visibilities are VISIBILITY_DEFAULT and | |
2745 | VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private | |
2746 | extern". There is no MACH-O equivalent of ELF's | |
2747 | VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */ | |
2748 | ||
b215c058 | 2749 | void |
2c5b6111 | 2750 | darwin_assemble_visibility (tree decl, int vis) |
2751 | { | |
2752 | if (vis == VISIBILITY_DEFAULT) | |
2753 | ; | |
a115dd2c | 2754 | else if (vis == VISIBILITY_HIDDEN || vis == VISIBILITY_INTERNAL) |
2c5b6111 | 2755 | { |
2756 | fputs ("\t.private_extern ", asm_out_file); | |
2757 | assemble_name (asm_out_file, | |
2758 | (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)))); | |
2759 | fputs ("\n", asm_out_file); | |
2760 | } | |
2761 | else | |
a115dd2c | 2762 | warning (OPT_Wattributes, "protected visibility attribute " |
9b2d6d13 | 2763 | "not supported in this configuration; ignored"); |
2c5b6111 | 2764 | } |
2765 | ||
f1f41a6c | 2766 | /* vec used by darwin_asm_dwarf_section. |
edea89b9 | 2767 | Maybe a hash tab would be better here - but the intention is that this is |
2768 | a very short list (fewer than 16 items) and each entry should (ideally, | |
2769 | eventually) only be presented once. | |
2770 | ||
2771 | A structure to hold a dwarf debug section used entry. */ | |
2772 | ||
2773 | typedef struct GTY(()) dwarf_sect_used_entry { | |
2774 | const char *name; | |
2775 | unsigned count; | |
2776 | } | |
2777 | dwarf_sect_used_entry; | |
2778 | ||
edea89b9 | 2779 | |
2780 | /* A list of used __DWARF sections. */ | |
f1f41a6c | 2781 | static GTY (()) vec<dwarf_sect_used_entry, va_gc> *dwarf_sect_names_table; |
edea89b9 | 2782 | |
2783 | /* This is called when we are asked to assemble a named section and the | |
2784 | name begins with __DWARF,. We keep a list of the section names (without | |
2785 | the __DWARF, prefix) and use this to emit our required start label on the | |
2786 | first switch to each section. */ | |
2787 | ||
2788 | static void | |
2789 | darwin_asm_dwarf_section (const char *name, unsigned int flags, | |
7b53e714 | 2790 | tree ARG_UNUSED (decl), bool is_for_lto) |
edea89b9 | 2791 | { |
2792 | unsigned i; | |
7b53e714 | 2793 | int namelen, extra = 0; |
2794 | const char *sect, *lto_add = ""; | |
2795 | char sname[64]; | |
edea89b9 | 2796 | dwarf_sect_used_entry *ref; |
2797 | bool found = false; | |
7b53e714 | 2798 | |
2799 | gcc_checking_assert ((flags & (SECTION_DEBUG | SECTION_NAMED)) | |
2800 | == (SECTION_DEBUG | SECTION_NAMED)); | |
2801 | ||
2802 | /* We know that the name starts with __DWARF, or __GNU_DAWRF_LTO */ | |
2803 | sect = strchr (name, ',') + 1; | |
2804 | namelen = strchr (sect, ',') - sect; | |
2805 | gcc_checking_assert (namelen); | |
2806 | ||
2807 | /* The section switch is output as written... */ | |
2808 | fprintf (asm_out_file, "\t.section %s\n", name); | |
2809 | ||
2810 | /* ... but the string we keep to make section start labels needs | |
2811 | adjustment for lto cases. */ | |
2812 | if (is_for_lto) | |
2813 | { | |
2814 | lto_add = "_lto"; | |
2815 | extra = 4; | |
2816 | } | |
2817 | ||
2818 | snprintf (sname, 64, "%.*s%.*s", namelen, sect, extra, lto_add); | |
2819 | namelen += extra; | |
2820 | ||
edea89b9 | 2821 | if (dwarf_sect_names_table == NULL) |
f1f41a6c | 2822 | vec_alloc (dwarf_sect_names_table, 16); |
edea89b9 | 2823 | else |
2824 | for (i = 0; | |
f1f41a6c | 2825 | dwarf_sect_names_table->iterate (i, &ref); |
edea89b9 | 2826 | i++) |
2827 | { | |
2828 | if (!ref) | |
2829 | break; | |
2830 | if (!strcmp (ref->name, sname)) | |
2831 | { | |
2832 | found = true; | |
2833 | ref->count++; | |
2834 | break; | |
2835 | } | |
2836 | } | |
2837 | ||
edea89b9 | 2838 | if (!found) |
2839 | { | |
2840 | dwarf_sect_used_entry e; | |
2841 | fprintf (asm_out_file, "Lsection%.*s:\n", namelen, sname); | |
2842 | e.count = 1; | |
2843 | e.name = xstrdup (sname); | |
f1f41a6c | 2844 | vec_safe_push (dwarf_sect_names_table, e); |
edea89b9 | 2845 | } |
2846 | } | |
2847 | ||
a08b74c8 | 2848 | /* Output a difference of two labels that will be an assembly time |
2849 | constant if the two labels are local. (.long lab1-lab2 will be | |
2850 | very different if lab1 is at the boundary between two sections; it | |
2851 | will be relocated according to the second section, not the first, | |
2852 | so one ends up with a difference between labels in different | |
2853 | sections, which is bad in the dwarf2 eh context for instance.) */ | |
2854 | ||
2855 | static int darwin_dwarf_label_counter; | |
2856 | ||
2857 | void | |
85d3e3b5 | 2858 | darwin_asm_output_dwarf_delta (FILE *file, int size, |
e1719e76 | 2859 | const char *lab1, const char *lab2, |
2860 | HOST_WIDE_INT offset) | |
a08b74c8 | 2861 | { |
2f9fc8ef | 2862 | int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L' |
2863 | && lab2[0] == '*' && lab2[1] == 'L'); | |
dcf3c3f7 | 2864 | const char *directive = (size == 8 ? ".quad" : ".long"); |
a08b74c8 | 2865 | |
2866 | if (islocaldiff) | |
2867 | fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter); | |
2868 | else | |
85d3e3b5 | 2869 | fprintf (file, "\t%s\t", directive); |
8e79e9d4 | 2870 | |
48126f0c | 2871 | assemble_name_raw (file, lab1); |
a08b74c8 | 2872 | fprintf (file, "-"); |
48126f0c | 2873 | assemble_name_raw (file, lab2); |
e1719e76 | 2874 | if (offset != 0) |
2875 | fprintf (file, "+" HOST_WIDE_INT_PRINT_DEC, offset); | |
a08b74c8 | 2876 | if (islocaldiff) |
85d3e3b5 | 2877 | fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++); |
a08b74c8 | 2878 | } |
d08d29c0 | 2879 | |
d08d29c0 | 2880 | /* Output an offset in a DWARF section on Darwin. On Darwin, DWARF section |
2881 | offsets are not represented using relocs in .o files; either the | |
2882 | section never leaves the .o file, or the linker or other tool is | |
2883 | responsible for parsing the DWARF and updating the offsets. */ | |
2884 | ||
2885 | void | |
2886 | darwin_asm_output_dwarf_offset (FILE *file, int size, const char * lab, | |
e1719e76 | 2887 | HOST_WIDE_INT offset, section *base) |
d08d29c0 | 2888 | { |
2889 | char sname[64]; | |
7b53e714 | 2890 | int namelen, extra = 0; |
2891 | bool is_for_lto; | |
2892 | const char *lto_add = ""; | |
2893 | ||
2894 | gcc_checking_assert (base->common.flags & SECTION_NAMED); | |
2895 | is_for_lto = strncmp (base->named.name, "__GNU_DWARF_LTO,", 16) == 0; | |
2896 | gcc_checking_assert (is_for_lto | |
2897 | || strncmp (base->named.name, "__DWARF,", 8) == 0); | |
2898 | const char *name = strchr (base->named.name, ',') + 1; | |
2899 | gcc_checking_assert (name); | |
2900 | ||
2901 | namelen = strchr (name, ',') - (name); | |
2902 | if (is_for_lto) | |
2903 | { | |
2904 | lto_add = "_lto"; | |
2905 | extra = 4; | |
2906 | } | |
2907 | snprintf (sname, 64, "*Lsection%.*s%.*s", namelen, name, extra, lto_add); | |
e1719e76 | 2908 | darwin_asm_output_dwarf_delta (file, size, lab, sname, offset); |
d08d29c0 | 2909 | } |
a08b74c8 | 2910 | |
13e2f0a0 | 2911 | /* Called from the within the TARGET_ASM_FILE_START for each target. */ |
edea89b9 | 2912 | |
2913 | void | |
2914 | darwin_file_start (void) | |
2915 | { | |
13e2f0a0 | 2916 | /* Nothing to do. */ |
edea89b9 | 2917 | } |
2918 | ||
2919 | /* Called for the TARGET_ASM_FILE_END hook. | |
2920 | Emit the mach-o pic indirection data, the lto data and, finally a flag | |
2921 | to tell the linker that it can break the file object into sections and | |
2922 | move those around for efficiency. */ | |
2923 | ||
f6940372 | 2924 | void |
b40da9a7 | 2925 | darwin_file_end (void) |
f6940372 | 2926 | { |
4b313269 | 2927 | if (!vec_safe_is_empty (ctors)) |
ed161dab | 2928 | finalize_ctors (); |
2929 | if (!vec_safe_is_empty (dtors)) | |
2930 | finalize_dtors (); | |
236ce1d1 | 2931 | |
2932 | /* If we are expecting to output NeXT ObjC meta-data, (and we actually see | |
2933 | some) then we output the fix-and-continue marker (Image Info). | |
2934 | This applies to Objective C, Objective C++ and LTO with either language | |
2935 | as part of the input. */ | |
2936 | if (flag_next_runtime && objc_metadata_seen) | |
2937 | { | |
2938 | unsigned int flags = 0; | |
2939 | if (flag_objc_abi >= 2) | |
2940 | { | |
2941 | flags = 16; | |
2942 | output_section_asm_op | |
2943 | (darwin_sections[objc2_image_info_section]->unnamed.data); | |
2944 | } | |
2945 | else | |
2946 | output_section_asm_op | |
2947 | (darwin_sections[objc_image_info_section]->unnamed.data); | |
2948 | ||
2949 | ASM_OUTPUT_ALIGN (asm_out_file, 2); | |
2950 | fputs ("L_OBJC_ImageInfo:\n", asm_out_file); | |
2951 | ||
2952 | flags |= (flag_replace_objc_classes && classes_seen) ? 1 : 0; | |
2953 | flags |= flag_objc_gc ? 2 : 0; | |
2954 | ||
2955 | fprintf (asm_out_file, "\t.long\t0\n\t.long\t%u\n", flags); | |
2956 | } | |
2957 | ||
f6940372 | 2958 | machopic_finish (asm_out_file); |
3a4a2292 | 2959 | if (lang_GNU_CXX ()) |
f6940372 | 2960 | { |
92e4ba7d | 2961 | switch_to_section (darwin_sections[constructor_section]); |
2962 | switch_to_section (darwin_sections[destructor_section]); | |
f6940372 | 2963 | ASM_OUTPUT_ALIGN (asm_out_file, 1); |
2964 | } | |
23433d72 | 2965 | |
2966 | /* If there was LTO assembler output, append it to asm_out_file. */ | |
2967 | if (lto_asm_out_name) | |
2968 | { | |
2969 | int n; | |
2970 | char *buf, *lto_asm_txt; | |
2971 | ||
2972 | /* Shouldn't be here if we failed to switch back. */ | |
2973 | gcc_assert (! saved_asm_out_file); | |
2974 | ||
2975 | lto_asm_out_file = fopen (lto_asm_out_name, "r"); | |
2976 | if (lto_asm_out_file == NULL) | |
c05be867 | 2977 | fatal_error (input_location, |
2978 | "failed to open temporary file %s with LTO output", | |
23433d72 | 2979 | lto_asm_out_name); |
2980 | fseek (lto_asm_out_file, 0, SEEK_END); | |
2981 | n = ftell (lto_asm_out_file); | |
2982 | if (n > 0) | |
2983 | { | |
2984 | fseek (lto_asm_out_file, 0, SEEK_SET); | |
2985 | lto_asm_txt = buf = (char *) xmalloc (n + 1); | |
2986 | while (fgets (lto_asm_txt, n, lto_asm_out_file)) | |
2987 | fputs (lto_asm_txt, asm_out_file); | |
13e2f0a0 | 2988 | /* Put a termination label. */ |
2989 | fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n", | |
2990 | LTO_SEGMENT_NAME, LTO_SECTS_SECTION); | |
2991 | fprintf (asm_out_file, "L_GNU_LTO%d:\t;# end of lto\n", | |
2992 | lto_section_num); | |
2993 | /* Make sure our termination label stays in this section. */ | |
2994 | fputs ("\t.space\t1\n", asm_out_file); | |
23433d72 | 2995 | } |
2996 | ||
2997 | /* Remove the temporary file. */ | |
2998 | fclose (lto_asm_out_file); | |
2999 | unlink_if_ordinary (lto_asm_out_name); | |
3000 | free (lto_asm_out_name); | |
3001 | } | |
3002 | ||
13e2f0a0 | 3003 | /* Output the names and indices. */ |
f1f41a6c | 3004 | if (lto_section_names && lto_section_names->length ()) |
23433d72 | 3005 | { |
13e2f0a0 | 3006 | int count; |
3007 | darwin_lto_section_e *ref; | |
3008 | /* For now, we'll make the offsets 4 bytes and unaligned - we'll fix | |
3009 | the latter up ourselves. */ | |
3010 | const char *op = integer_asm_op (4,0); | |
3011 | ||
3012 | /* Emit the names. */ | |
3013 | fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n", | |
23433d72 | 3014 | LTO_SEGMENT_NAME, LTO_NAMES_SECTION); |
f1f41a6c | 3015 | FOR_EACH_VEC_ELT (*lto_section_names, count, ref) |
13e2f0a0 | 3016 | { |
3017 | fprintf (asm_out_file, "L_GNU_LTO_NAME%d:\n", count); | |
3018 | /* We have to jump through hoops to get the values of the intra-section | |
3019 | offsets... */ | |
3020 | fprintf (asm_out_file, | |
3021 | "\t.set L$gnu$lto$noff%d,L_GNU_LTO_NAME%d-L_GNU_LTO_NAME0\n", | |
3022 | count, count); | |
3023 | fprintf (asm_out_file, | |
3024 | "\t.set L$gnu$lto$nsiz%d,L_GNU_LTO_NAME%d-L_GNU_LTO_NAME%d\n", | |
3025 | count, count+1, count); | |
3026 | fprintf (asm_out_file, "\t.asciz\t\"%s\"\n", ref->sectname); | |
3027 | } | |
3028 | fprintf (asm_out_file, "L_GNU_LTO_NAME%d:\t;# end\n", lto_section_num); | |
3029 | /* make sure our termination label stays in this section. */ | |
3030 | fputs ("\t.space\t1\n", asm_out_file); | |
3031 | ||
3032 | /* Emit the Index. */ | |
3033 | fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n", | |
3034 | LTO_SEGMENT_NAME, LTO_INDEX_SECTION); | |
3035 | fputs ("\t.align\t2\n", asm_out_file); | |
3036 | fputs ("# Section offset, Section length, Name offset, Name length\n", | |
3037 | asm_out_file); | |
f1f41a6c | 3038 | FOR_EACH_VEC_ELT (*lto_section_names, count, ref) |
13e2f0a0 | 3039 | { |
3040 | fprintf (asm_out_file, "%s L$gnu$lto$offs%d\t;# %s\n", | |
3041 | op, count, ref->sectname); | |
3042 | fprintf (asm_out_file, "%s L$gnu$lto$size%d\n", op, count); | |
3043 | fprintf (asm_out_file, "%s L$gnu$lto$noff%d\n", op, count); | |
3044 | fprintf (asm_out_file, "%s L$gnu$lto$nsiz%d\n", op, count); | |
3045 | } | |
23433d72 | 3046 | } |
23433d72 | 3047 | |
8e79e9d4 | 3048 | /* If we have section anchors, then we must prevent the linker from |
3049 | re-arranging data. */ | |
3050 | if (!DARWIN_SECTION_ANCHORS || !flag_section_anchors) | |
3051 | fprintf (asm_out_file, "\t.subsections_via_symbols\n"); | |
f6940372 | 3052 | } |
3053 | ||
5b182752 | 3054 | /* TODO: Add a language hook for identifying if a decl is a vtable. */ |
3055 | #define DARWIN_VTABLE_P(DECL) 0 | |
3056 | ||
0765d519 | 3057 | /* Cross-module name binding. Darwin does not support overriding |
5b182752 | 3058 | functions at dynamic-link time, except for vtables in kexts. */ |
0765d519 | 3059 | |
3060 | bool | |
a9f1838b | 3061 | darwin_binds_local_p (const_tree decl) |
0765d519 | 3062 | { |
5b182752 | 3063 | return default_binds_local_p_1 (decl, |
3064 | TARGET_KEXTABI && DARWIN_VTABLE_P (decl)); | |
0765d519 | 3065 | } |
3066 | ||
8c27005f | 3067 | /* The Darwin's implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the |
3068 | anchor relative to ".", the current section position. We cannot use | |
3069 | the default one because ASM_OUTPUT_DEF is wrong for Darwin. */ | |
8c27005f | 3070 | void |
3071 | darwin_asm_output_anchor (rtx symbol) | |
3072 | { | |
3073 | fprintf (asm_out_file, "\t.set\t"); | |
3074 | assemble_name (asm_out_file, XSTR (symbol, 0)); | |
3075 | fprintf (asm_out_file, ", . + " HOST_WIDE_INT_PRINT_DEC "\n", | |
3076 | SYMBOL_REF_BLOCK_OFFSET (symbol)); | |
3077 | } | |
8e79e9d4 | 3078 | |
8b1fba2c | 3079 | /* Disable section anchoring on any section containing a zero-sized |
8e79e9d4 | 3080 | object. */ |
3081 | bool | |
3082 | darwin_use_anchors_for_symbol_p (const_rtx symbol) | |
3083 | { | |
8b1fba2c | 3084 | if (DARWIN_SECTION_ANCHORS && flag_section_anchors) |
8e79e9d4 | 3085 | { |
3086 | section *sect; | |
3087 | /* If the section contains a zero-sized object it's ineligible. */ | |
3088 | sect = SYMBOL_REF_BLOCK (symbol)->sect; | |
3089 | /* This should have the effect of disabling anchors for vars that follow | |
8b1fba2c | 3090 | any zero-sized one, in a given section. */ |
8e79e9d4 | 3091 | if (sect->common.flags & SECTION_NO_ANCHOR) |
3092 | return false; | |
3093 | ||
8b1fba2c | 3094 | /* Also check the normal reasons for suppressing. */ |
3095 | return default_use_anchors_for_symbol_p (symbol); | |
8e79e9d4 | 3096 | } |
3097 | else | |
3098 | return false; | |
3099 | } | |
8c27005f | 3100 | |
f720b7c6 | 3101 | /* Set the darwin specific attributes on TYPE. */ |
3102 | void | |
3103 | darwin_set_default_type_attributes (tree type) | |
3104 | { | |
3105 | if (darwin_ms_struct | |
3106 | && TREE_CODE (type) == RECORD_TYPE) | |
3107 | TYPE_ATTRIBUTES (type) = tree_cons (get_identifier ("ms_struct"), | |
3108 | NULL_TREE, | |
3109 | TYPE_ATTRIBUTES (type)); | |
3110 | } | |
3111 | ||
26ac986e | 3112 | /* True, iff we're generating code for loadable kernel extensions. */ |
5b182752 | 3113 | |
3114 | bool | |
3115 | darwin_kextabi_p (void) { | |
3116 | return flag_apple_kext; | |
3117 | } | |
3118 | ||
3119 | void | |
3120 | darwin_override_options (void) | |
3121 | { | |
9e09909d | 3122 | /* Keep track of which (major) version we're generating code for. */ |
3123 | if (darwin_macosx_version_min) | |
3124 | { | |
3125 | if (strverscmp (darwin_macosx_version_min, "10.6") >= 0) | |
3126 | generating_for_darwin_version = 10; | |
3127 | else if (strverscmp (darwin_macosx_version_min, "10.5") >= 0) | |
3128 | generating_for_darwin_version = 9; | |
3129 | ||
3130 | /* Earlier versions are not specifically accounted, until required. */ | |
3131 | } | |
8e79e9d4 | 3132 | |
f199808c | 3133 | /* Older Darwin ld could not coalesce weak entities without them being |
3134 | placed in special sections. */ | |
3135 | if (darwin_target_linker | |
3136 | && (strverscmp (darwin_target_linker, MIN_LD64_NO_COAL_SECTS) < 0)) | |
3137 | ld_uses_coal_sects = true; | |
3138 | ||
3f3d5ad4 | 3139 | /* In principle, this should be c-family only. However, we really need to |
3140 | set sensible defaults for LTO as well, since the section selection stuff | |
3141 | should check for correctness re. the ABI. TODO: check and provide the | |
3142 | flags (runtime & ABI) from the lto wrapper). */ | |
3143 | ||
3144 | /* Unless set, force ABI=2 for NeXT and m64, 0 otherwise. */ | |
3145 | if (!global_options_set.x_flag_objc_abi) | |
3146 | global_options.x_flag_objc_abi | |
3147 | = (!flag_next_runtime) | |
3148 | ? 0 | |
3149 | : (TARGET_64BIT ? 2 | |
3150 | : (generating_for_darwin_version >= 9) ? 1 | |
3151 | : 0); | |
3152 | ||
3153 | /* Objective-C family ABI 2 is only valid for next/m64 at present. */ | |
3154 | if (global_options_set.x_flag_objc_abi && flag_next_runtime) | |
3155 | { | |
3156 | if (TARGET_64BIT && global_options.x_flag_objc_abi < 2) | |
3157 | error_at (UNKNOWN_LOCATION, "%<-fobjc-abi-version%> >= 2 must be" | |
3158 | " used for %<-m64%> targets with" | |
3159 | " %<-fnext-runtime%>"); | |
3160 | if (!TARGET_64BIT && global_options.x_flag_objc_abi >= 2) | |
3161 | error_at (UNKNOWN_LOCATION, "%<-fobjc-abi-version%> >= 2 is not" | |
3162 | " supported on %<-m32%> targets with" | |
3163 | " %<-fnext-runtime%>"); | |
3164 | } | |
3165 | ||
024fa7dd | 3166 | /* Don't emit DWARF3/4 unless specifically selected. This is a |
3167 | workaround for tool bugs. */ | |
8e79e9d4 | 3168 | if (!global_options_set.x_dwarf_strict) |
024fa7dd | 3169 | dwarf_strict = 1; |
052166fd | 3170 | if (!global_options_set.x_dwarf_version) |
3171 | dwarf_version = 2; | |
024fa7dd | 3172 | |
8284d341 | 3173 | if (global_options_set.x_dwarf_split_debug_info) |
3174 | { | |
3175 | inform (input_location, | |
2f6d557f | 3176 | "%<-gsplit-dwarf%> is not supported on this platform, ignored"); |
8284d341 | 3177 | dwarf_split_debug_info = 0; |
3178 | global_options_set.x_dwarf_split_debug_info = 0; | |
3179 | } | |
3180 | ||
9e09909d | 3181 | /* Do not allow unwind tables to be generated by default for m32. |
3182 | fnon-call-exceptions will override this, regardless of what we do. */ | |
3183 | if (generating_for_darwin_version < 10 | |
3184 | && !global_options_set.x_flag_asynchronous_unwind_tables | |
3185 | && !TARGET_64BIT) | |
3186 | global_options.x_flag_asynchronous_unwind_tables = 0; | |
3187 | ||
5886e9ab | 3188 | /* Disable -freorder-blocks-and-partition when unwind tables are being |
3189 | emitted for Darwin < 9 (OSX 10.5). | |
3190 | The strategy is, "Unless the User has specifically set/unset an unwind | |
3191 | flag we will switch off -freorder-blocks-and-partition when unwind tables | |
3192 | will be generated". If the User specifically sets flags... we assume | |
3193 | (s)he knows why... */ | |
3b3edcd4 | 3194 | if (generating_for_darwin_version < 9 |
9e09909d | 3195 | && global_options_set.x_flag_reorder_blocks_and_partition |
3196 | && ((global_options.x_flag_exceptions /* User, c++, java */ | |
3197 | && !global_options_set.x_flag_exceptions) /* User specified... */ | |
3198 | || (global_options.x_flag_unwind_tables | |
5886e9ab | 3199 | && !global_options_set.x_flag_unwind_tables) |
9e09909d | 3200 | || (global_options.x_flag_non_call_exceptions |
5886e9ab | 3201 | && !global_options_set.x_flag_non_call_exceptions) |
9e09909d | 3202 | || (global_options.x_flag_asynchronous_unwind_tables |
5886e9ab | 3203 | && !global_options_set.x_flag_asynchronous_unwind_tables))) |
3204 | { | |
3205 | inform (input_location, | |
2f6d557f | 3206 | "%<-freorder-blocks-and-partition%> does not work with " |
3207 | "exceptions on this architecture"); | |
5886e9ab | 3208 | flag_reorder_blocks_and_partition = 0; |
3209 | flag_reorder_blocks = 1; | |
3210 | } | |
14325167 | 3211 | |
c60ecc90 | 3212 | /* FIXME: flag_objc_sjlj_exceptions is no longer needed since there is only |
3213 | one valid choice of exception scheme for each runtime. */ | |
3214 | if (!global_options_set.x_flag_objc_sjlj_exceptions) | |
3215 | global_options.x_flag_objc_sjlj_exceptions = | |
3216 | flag_next_runtime && !TARGET_64BIT; | |
3217 | ||
3218 | /* FIXME: and this could be eliminated then too. */ | |
3219 | if (!global_options_set.x_flag_exceptions | |
3220 | && flag_objc_exceptions | |
3221 | && TARGET_64BIT) | |
3222 | flag_exceptions = 1; | |
3223 | ||
5b182752 | 3224 | if (flag_mkernel || flag_apple_kext) |
3225 | { | |
3226 | /* -mkernel implies -fapple-kext for C++ */ | |
3a4a2292 | 3227 | if (lang_GNU_CXX ()) |
5b182752 | 3228 | flag_apple_kext = 1; |
3229 | ||
3230 | flag_no_common = 1; | |
3231 | ||
3232 | /* No EH in kexts. */ | |
3233 | flag_exceptions = 0; | |
3234 | /* No -fnon-call-exceptions data in kexts. */ | |
3235 | flag_non_call_exceptions = 0; | |
8e79e9d4 | 3236 | /* so no tables either.. */ |
3237 | flag_unwind_tables = 0; | |
3238 | flag_asynchronous_unwind_tables = 0; | |
3cf7ab3b | 3239 | /* We still need to emit branch islands for kernel context. */ |
3240 | darwin_emit_branch_islands = true; | |
5b182752 | 3241 | } |
8e79e9d4 | 3242 | |
3e1cce93 | 3243 | if (flag_var_tracking_uninit == 0 |
f067760b | 3244 | && generating_for_darwin_version >= 9 |
3245 | && (flag_gtoggle ? (debug_info_level == DINFO_LEVEL_NONE) | |
3246 | : (debug_info_level >= DINFO_LEVEL_NORMAL)) | |
3247 | && write_symbols == DWARF2_DEBUG) | |
3e1cce93 | 3248 | flag_var_tracking_uninit = flag_var_tracking; |
3cf7ab3b | 3249 | |
90ff10b3 | 3250 | if (MACHO_DYNAMIC_NO_PIC_P) |
3251 | { | |
3252 | if (flag_pic) | |
b7d1dec3 | 3253 | warning_at (UNKNOWN_LOCATION, 0, |
3254 | "%<-mdynamic-no-pic%> overrides %<-fpic%>, %<-fPIC%>," | |
3255 | " %<-fpie%> or %<-fPIE%>"); | |
90ff10b3 | 3256 | flag_pic = 0; |
3257 | } | |
3258 | else if (flag_pic == 1) | |
3259 | { | |
3260 | /* Darwin's -fpic is -fPIC. */ | |
3261 | flag_pic = 2; | |
3262 | } | |
3263 | ||
3cf7ab3b | 3264 | /* It is assumed that branch island stubs are needed for earlier systems. */ |
9e09909d | 3265 | if (generating_for_darwin_version < 9) |
3cf7ab3b | 3266 | darwin_emit_branch_islands = true; |
8e79e9d4 | 3267 | else |
3268 | emit_aligned_common = true; /* Later systems can support aligned common. */ | |
d4238e8b | 3269 | |
3270 | /* The c_dialect...() macros are not available to us here. */ | |
3271 | darwin_running_cxx = (strstr (lang_hooks.name, "C++") != 0); | |
5b182752 | 3272 | } |
3273 | ||
8158aa7e | 3274 | #if DARWIN_PPC |
3275 | /* Add $LDBL128 suffix to long double builtins for ppc darwin. */ | |
6aee6ac8 | 3276 | |
3277 | static void | |
8158aa7e | 3278 | darwin_patch_builtin (enum built_in_function fncode) |
6aee6ac8 | 3279 | { |
b9a16870 | 3280 | tree fn = builtin_decl_explicit (fncode); |
6aee6ac8 | 3281 | tree sym; |
3282 | char *newname; | |
3283 | ||
3284 | if (!fn) | |
3285 | return; | |
3286 | ||
3287 | sym = DECL_ASSEMBLER_NAME (fn); | |
d243d9c9 | 3288 | newname = ACONCAT (("_", IDENTIFIER_POINTER (sym), "$LDBL128", NULL)); |
3289 | ||
6aee6ac8 | 3290 | set_user_assembler_name (fn, newname); |
6aee6ac8 | 3291 | |
b9a16870 | 3292 | fn = builtin_decl_implicit (fncode); |
6aee6ac8 | 3293 | if (fn) |
3294 | set_user_assembler_name (fn, newname); | |
6aee6ac8 | 3295 | } |
3296 | ||
3297 | void | |
3298 | darwin_patch_builtins (void) | |
3299 | { | |
3300 | if (LONG_DOUBLE_TYPE_SIZE != 128) | |
3301 | return; | |
3302 | ||
3303 | #define PATCH_BUILTIN(fncode) darwin_patch_builtin (fncode); | |
d243d9c9 | 3304 | #define PATCH_BUILTIN_NO64(fncode) \ |
3305 | if (!TARGET_64BIT) \ | |
6aee6ac8 | 3306 | darwin_patch_builtin (fncode); |
d243d9c9 | 3307 | #define PATCH_BUILTIN_VARIADIC(fncode) \ |
3308 | if (!TARGET_64BIT \ | |
6aee6ac8 | 3309 | && (strverscmp (darwin_macosx_version_min, "10.3.9") >= 0)) \ |
3310 | darwin_patch_builtin (fncode); | |
3311 | #include "darwin-ppc-ldouble-patch.def" | |
3312 | #undef PATCH_BUILTIN | |
3313 | #undef PATCH_BUILTIN_NO64 | |
3314 | #undef PATCH_BUILTIN_VARIADIC | |
3315 | } | |
8158aa7e | 3316 | #endif |
6aee6ac8 | 3317 | |
d4238e8b | 3318 | /* CFStrings implementation. */ |
3319 | static GTY(()) tree cfstring_class_reference = NULL_TREE; | |
3320 | static GTY(()) tree cfstring_type_node = NULL_TREE; | |
3321 | static GTY(()) tree ccfstring_type_node = NULL_TREE; | |
3322 | static GTY(()) tree pccfstring_type_node = NULL_TREE; | |
3323 | static GTY(()) tree pcint_type_node = NULL_TREE; | |
3324 | static GTY(()) tree pcchar_type_node = NULL_TREE; | |
3325 | ||
820c090b | 3326 | static enum built_in_function darwin_builtin_cfstring; |
d4238e8b | 3327 | |
3328 | /* Store all constructed constant CFStrings in a hash table so that | |
3329 | they get uniqued properly. */ | |
3330 | ||
2ef51f0e | 3331 | typedef struct GTY ((for_user)) cfstring_descriptor { |
d4238e8b | 3332 | /* The string literal. */ |
3333 | tree literal; | |
3334 | /* The resulting constant CFString. */ | |
3335 | tree constructor; | |
3336 | } cfstring_descriptor; | |
3337 | ||
b594087e | 3338 | struct cfstring_hasher : ggc_ptr_hash<cfstring_descriptor> |
2ef51f0e | 3339 | { |
3340 | static hashval_t hash (cfstring_descriptor *); | |
3341 | static bool equal (cfstring_descriptor *, cfstring_descriptor *); | |
3342 | }; | |
d4238e8b | 3343 | |
2ef51f0e | 3344 | static GTY (()) hash_table<cfstring_hasher> *cfstring_htab; |
d4238e8b | 3345 | |
3346 | static tree | |
3347 | add_builtin_field_decl (tree type, const char *name, tree **chain) | |
3348 | { | |
3349 | tree field = build_decl (BUILTINS_LOCATION, FIELD_DECL, | |
3350 | get_identifier (name), type); | |
3351 | ||
3352 | if (*chain != NULL) | |
3353 | **chain = field; | |
3354 | *chain = &DECL_CHAIN (field); | |
3355 | ||
3356 | return field; | |
3357 | } | |
3358 | ||
820c090b | 3359 | tree |
3360 | darwin_init_cfstring_builtins (unsigned builtin_cfstring) | |
d4238e8b | 3361 | { |
3362 | tree cfsfun, fields, pccfstring_ftype_pcchar; | |
3363 | tree *chain = NULL; | |
3364 | ||
820c090b | 3365 | darwin_builtin_cfstring = |
3366 | (enum built_in_function) builtin_cfstring; | |
d4238e8b | 3367 | |
3368 | /* struct __builtin_CFString { | |
3369 | const int *isa; (will point at | |
3370 | int flags; __CFConstantStringClassReference) | |
3371 | const char *str; | |
3372 | long length; | |
3373 | }; */ | |
3374 | ||
3375 | pcint_type_node = build_pointer_type | |
3376 | (build_qualified_type (integer_type_node, TYPE_QUAL_CONST)); | |
3377 | ||
3378 | pcchar_type_node = build_pointer_type | |
3379 | (build_qualified_type (char_type_node, TYPE_QUAL_CONST)); | |
3380 | ||
3381 | cfstring_type_node = (*lang_hooks.types.make_type) (RECORD_TYPE); | |
3382 | ||
3383 | /* Have to build backwards for finish struct. */ | |
3384 | fields = add_builtin_field_decl (long_integer_type_node, "length", &chain); | |
3385 | add_builtin_field_decl (pcchar_type_node, "str", &chain); | |
3386 | add_builtin_field_decl (integer_type_node, "flags", &chain); | |
3387 | add_builtin_field_decl (pcint_type_node, "isa", &chain); | |
3388 | finish_builtin_struct (cfstring_type_node, "__builtin_CFString", | |
3389 | fields, NULL_TREE); | |
3390 | ||
3391 | /* const struct __builtin_CFstring * | |
3392 | __builtin___CFStringMakeConstantString (const char *); */ | |
3393 | ||
3394 | ccfstring_type_node = build_qualified_type | |
3395 | (cfstring_type_node, TYPE_QUAL_CONST); | |
3396 | pccfstring_type_node = build_pointer_type (ccfstring_type_node); | |
3397 | pccfstring_ftype_pcchar = build_function_type_list | |
3398 | (pccfstring_type_node, pcchar_type_node, NULL_TREE); | |
3399 | ||
3400 | cfsfun = build_decl (BUILTINS_LOCATION, FUNCTION_DECL, | |
3401 | get_identifier ("__builtin___CFStringMakeConstantString"), | |
3402 | pccfstring_ftype_pcchar); | |
3403 | ||
3404 | TREE_PUBLIC (cfsfun) = 1; | |
3405 | DECL_EXTERNAL (cfsfun) = 1; | |
3406 | DECL_ARTIFICIAL (cfsfun) = 1; | |
3407 | /* Make a lang-specific section - dup_lang_specific_decl makes a new node | |
3408 | in place of the existing, which may be NULL. */ | |
3409 | DECL_LANG_SPECIFIC (cfsfun) = NULL; | |
3410 | (*lang_hooks.dup_lang_specific_decl) (cfsfun); | |
3411 | DECL_BUILT_IN_CLASS (cfsfun) = BUILT_IN_MD; | |
820c090b | 3412 | DECL_FUNCTION_CODE (cfsfun) = darwin_builtin_cfstring; |
d4238e8b | 3413 | lang_hooks.builtin_function (cfsfun); |
3414 | ||
3415 | /* extern int __CFConstantStringClassReference[]; */ | |
3416 | cfstring_class_reference = build_decl (BUILTINS_LOCATION, VAR_DECL, | |
3417 | get_identifier ("__CFConstantStringClassReference"), | |
3418 | build_array_type (integer_type_node, NULL_TREE)); | |
3419 | ||
3420 | TREE_PUBLIC (cfstring_class_reference) = 1; | |
3421 | DECL_ARTIFICIAL (cfstring_class_reference) = 1; | |
3422 | (*lang_hooks.decls.pushdecl) (cfstring_class_reference); | |
3423 | DECL_EXTERNAL (cfstring_class_reference) = 1; | |
3424 | rest_of_decl_compilation (cfstring_class_reference, 0, 0); | |
3425 | ||
3426 | /* Initialize the hash table used to hold the constant CFString objects. */ | |
2ef51f0e | 3427 | cfstring_htab = hash_table<cfstring_hasher>::create_ggc (31); |
820c090b | 3428 | |
3429 | return cfstring_type_node; | |
d4238e8b | 3430 | } |
3431 | ||
3432 | tree | |
3433 | darwin_fold_builtin (tree fndecl, int n_args, tree *argp, | |
3434 | bool ARG_UNUSED (ignore)) | |
3435 | { | |
3436 | unsigned int fcode = DECL_FUNCTION_CODE (fndecl); | |
3437 | ||
820c090b | 3438 | if (fcode == darwin_builtin_cfstring) |
d4238e8b | 3439 | { |
3440 | if (!darwin_constant_cfstrings) | |
3441 | { | |
3442 | error ("built-in function %qD requires the" | |
3443 | " %<-mconstant-cfstrings%> flag", fndecl); | |
3444 | return error_mark_node; | |
3445 | } | |
3446 | ||
3447 | if (n_args != 1) | |
3448 | { | |
3449 | error ("built-in function %qD takes one argument only", fndecl); | |
3450 | return error_mark_node; | |
3451 | } | |
3452 | ||
3453 | return darwin_build_constant_cfstring (*argp); | |
3454 | } | |
3455 | ||
3456 | return NULL_TREE; | |
3457 | } | |
3458 | ||
f6829196 | 3459 | void |
3460 | darwin_rename_builtins (void) | |
3461 | { | |
3462 | /* The system ___divdc3 routine in libSystem on darwin10 is not | |
3463 | accurate to 1ulp, ours is, so we avoid ever using the system name | |
3464 | for this routine and instead install a non-conflicting name that | |
3465 | is accurate. | |
3466 | ||
3467 | When -ffast-math or -funsafe-math-optimizations is given, we can | |
3468 | use the faster version. */ | |
3469 | if (!flag_unsafe_math_optimizations) | |
3470 | { | |
b9a16870 | 3471 | enum built_in_function dcode |
3472 | = (enum built_in_function)(BUILT_IN_COMPLEX_DIV_MIN | |
3473 | + DCmode - MIN_MODE_COMPLEX_FLOAT); | |
3474 | tree fn = builtin_decl_explicit (dcode); | |
f6829196 | 3475 | /* Fortran and c call TARGET_INIT_BUILTINS and |
3476 | TARGET_INIT_LIBFUNCS at different times, so we have to put a | |
3477 | call into each to ensure that at least one of them is called | |
3478 | after build_common_builtin_nodes. A better fix is to add a | |
3479 | new hook to run after build_common_builtin_nodes runs. */ | |
3480 | if (fn) | |
3481 | set_user_assembler_name (fn, "___ieee_divdc3"); | |
b9a16870 | 3482 | fn = builtin_decl_implicit (dcode); |
f6829196 | 3483 | if (fn) |
3484 | set_user_assembler_name (fn, "___ieee_divdc3"); | |
3485 | } | |
3486 | } | |
3487 | ||
30f690e0 | 3488 | bool |
3489 | darwin_libc_has_function (enum function_class fn_class) | |
3490 | { | |
3491 | if (fn_class == function_sincos) | |
3492 | return false; | |
3493 | if (fn_class == function_c99_math_complex | |
3494 | || fn_class == function_c99_misc) | |
3495 | return (TARGET_64BIT | |
3496 | || strverscmp (darwin_macosx_version_min, "10.3") >= 0); | |
3497 | ||
3498 | return true; | |
3499 | } | |
3500 | ||
2ef51f0e | 3501 | hashval_t |
3502 | cfstring_hasher::hash (cfstring_descriptor *ptr) | |
d4238e8b | 3503 | { |
2ef51f0e | 3504 | tree str = ptr->literal; |
d4238e8b | 3505 | const unsigned char *p = (const unsigned char *) TREE_STRING_POINTER (str); |
3506 | int i, len = TREE_STRING_LENGTH (str); | |
3507 | hashval_t h = len; | |
3508 | ||
3509 | for (i = 0; i < len; i++) | |
3510 | h = ((h * 613) + p[i]); | |
3511 | ||
3512 | return h; | |
3513 | } | |
3514 | ||
2ef51f0e | 3515 | bool |
3516 | cfstring_hasher::equal (cfstring_descriptor *ptr1, cfstring_descriptor *ptr2) | |
d4238e8b | 3517 | { |
2ef51f0e | 3518 | tree str1 = ptr1->literal; |
3519 | tree str2 = ptr2->literal; | |
d4238e8b | 3520 | int len1 = TREE_STRING_LENGTH (str1); |
3521 | ||
3522 | return (len1 == TREE_STRING_LENGTH (str2) | |
3523 | && !memcmp (TREE_STRING_POINTER (str1), TREE_STRING_POINTER (str2), | |
3524 | len1)); | |
3525 | } | |
3526 | ||
3527 | tree | |
3528 | darwin_build_constant_cfstring (tree str) | |
3529 | { | |
3530 | struct cfstring_descriptor *desc, key; | |
d4238e8b | 3531 | tree addr; |
3532 | ||
3533 | if (!str) | |
3534 | { | |
3535 | error ("CFString literal is missing"); | |
3536 | return error_mark_node; | |
3537 | } | |
3538 | ||
3539 | STRIP_NOPS (str); | |
3540 | ||
3541 | if (TREE_CODE (str) == ADDR_EXPR) | |
3542 | str = TREE_OPERAND (str, 0); | |
3543 | ||
3544 | if (TREE_CODE (str) != STRING_CST) | |
3545 | { | |
3546 | error ("CFString literal expression is not a string constant"); | |
3547 | return error_mark_node; | |
3548 | } | |
3549 | ||
3550 | /* Perhaps we already constructed a constant CFString just like this one? */ | |
3551 | key.literal = str; | |
2ef51f0e | 3552 | cfstring_descriptor **loc = cfstring_htab->find_slot (&key, INSERT); |
3553 | desc = *loc; | |
d4238e8b | 3554 | |
3555 | if (!desc) | |
3556 | { | |
3557 | tree var, constructor, field; | |
f1f41a6c | 3558 | vec<constructor_elt, va_gc> *v = NULL; |
d4238e8b | 3559 | int length = TREE_STRING_LENGTH (str) - 1; |
3560 | ||
3561 | if (darwin_warn_nonportable_cfstrings) | |
3562 | { | |
3563 | const char *s = TREE_STRING_POINTER (str); | |
3564 | int l = 0; | |
3565 | ||
3566 | for (l = 0; l < length; l++) | |
3567 | if (!s[l] || !isascii (s[l])) | |
3568 | { | |
c1c6d679 | 3569 | warning (darwin_warn_nonportable_cfstrings, |
3570 | s[l] ? G_("non-ASCII character in CFString literal") | |
3571 | : G_("embedded NUL in CFString literal")); | |
d4238e8b | 3572 | break; |
3573 | } | |
3574 | } | |
3575 | ||
25a27413 | 3576 | *loc = desc = ggc_cleared_alloc<cfstring_descriptor> (); |
d4238e8b | 3577 | desc->literal = str; |
3578 | ||
3579 | /* isa *. */ | |
3580 | field = TYPE_FIELDS (ccfstring_type_node); | |
3581 | CONSTRUCTOR_APPEND_ELT(v, NULL_TREE, | |
3582 | build1 (ADDR_EXPR, TREE_TYPE (field), | |
3583 | cfstring_class_reference)); | |
3584 | /* flags */ | |
3585 | field = DECL_CHAIN (field); | |
3586 | CONSTRUCTOR_APPEND_ELT(v, NULL_TREE, | |
3587 | build_int_cst (TREE_TYPE (field), 0x000007c8)); | |
3588 | /* string *. */ | |
3589 | field = DECL_CHAIN (field); | |
3590 | CONSTRUCTOR_APPEND_ELT(v, NULL_TREE, | |
3591 | build1 (ADDR_EXPR, TREE_TYPE (field), str)); | |
3592 | /* length */ | |
3593 | field = DECL_CHAIN (field); | |
3594 | CONSTRUCTOR_APPEND_ELT(v, NULL_TREE, | |
3595 | build_int_cst (TREE_TYPE (field), length)); | |
3596 | ||
3597 | constructor = build_constructor (ccfstring_type_node, v); | |
3598 | TREE_READONLY (constructor) = 1; | |
3599 | TREE_CONSTANT (constructor) = 1; | |
3600 | TREE_STATIC (constructor) = 1; | |
3601 | ||
3602 | /* Fromage: The C++ flavor of 'build_unary_op' expects constructor nodes | |
3603 | to have the TREE_HAS_CONSTRUCTOR (...) bit set. However, this file is | |
3604 | being built without any knowledge of C++ tree accessors; hence, we shall | |
3605 | use the generic accessor that TREE_HAS_CONSTRUCTOR actually maps to! */ | |
3606 | if (darwin_running_cxx) | |
3607 | TREE_LANG_FLAG_4 (constructor) = 1; /* TREE_HAS_CONSTRUCTOR */ | |
3608 | ||
3609 | /* Create an anonymous global variable for this CFString. */ | |
3610 | var = build_decl (input_location, CONST_DECL, | |
3611 | NULL, TREE_TYPE (constructor)); | |
3612 | DECL_ARTIFICIAL (var) = 1; | |
3613 | TREE_STATIC (var) = 1; | |
3614 | DECL_INITIAL (var) = constructor; | |
3615 | /* FIXME: This should use a translation_unit_decl to indicate file scope. */ | |
3616 | DECL_CONTEXT (var) = NULL_TREE; | |
3617 | desc->constructor = var; | |
3618 | } | |
3619 | ||
3620 | addr = build1 (ADDR_EXPR, pccfstring_type_node, desc->constructor); | |
3621 | TREE_CONSTANT (addr) = 1; | |
3622 | ||
3623 | return addr; | |
3624 | } | |
3625 | ||
3626 | bool | |
3627 | darwin_cfstring_p (tree str) | |
3628 | { | |
3629 | struct cfstring_descriptor key; | |
d4238e8b | 3630 | |
3631 | if (!str) | |
3632 | return false; | |
3633 | ||
3634 | STRIP_NOPS (str); | |
3635 | ||
3636 | if (TREE_CODE (str) == ADDR_EXPR) | |
3637 | str = TREE_OPERAND (str, 0); | |
3638 | ||
3639 | if (TREE_CODE (str) != STRING_CST) | |
3640 | return false; | |
3641 | ||
3642 | key.literal = str; | |
2ef51f0e | 3643 | cfstring_descriptor **loc = cfstring_htab->find_slot (&key, NO_INSERT); |
d4238e8b | 3644 | |
3645 | if (loc) | |
3646 | return true; | |
3647 | ||
3648 | return false; | |
3649 | } | |
3650 | ||
3651 | void | |
3652 | darwin_enter_string_into_cfstring_table (tree str) | |
3653 | { | |
3654 | struct cfstring_descriptor key; | |
d4238e8b | 3655 | |
3656 | key.literal = str; | |
2ef51f0e | 3657 | cfstring_descriptor **loc = cfstring_htab->find_slot (&key, INSERT); |
d4238e8b | 3658 | |
3659 | if (!*loc) | |
3660 | { | |
25a27413 | 3661 | *loc = ggc_cleared_alloc<cfstring_descriptor> (); |
d4238e8b | 3662 | ((struct cfstring_descriptor *)*loc)->literal = str; |
3663 | } | |
3664 | } | |
6aee6ac8 | 3665 | |
3b73548b | 3666 | /* Choose named function section based on its frequency. */ |
3667 | ||
3668 | section * | |
3669 | darwin_function_section (tree decl, enum node_frequency freq, | |
3670 | bool startup, bool exit) | |
3671 | { | |
9e09909d | 3672 | /* Decide if we need to put this in a coalescable section. */ |
f199808c | 3673 | bool weak = (decl |
9e09909d | 3674 | && DECL_WEAK (decl) |
3675 | && (!DECL_ATTRIBUTES (decl) | |
3676 | || !lookup_attribute ("weak_import", | |
3677 | DECL_ATTRIBUTES (decl)))); | |
3678 | ||
f199808c | 3679 | bool use_coal = weak && ld_uses_coal_sects; |
9e09909d | 3680 | /* If there is a specified section name, we should not be trying to |
3681 | override. */ | |
738a6bda | 3682 | if (decl && DECL_SECTION_NAME (decl) != NULL) |
9e09909d | 3683 | return get_named_section (decl, NULL, 0); |
3684 | ||
0fbd1542 | 3685 | /* We always put unlikely executed stuff in the cold section. */ |
3686 | if (freq == NODE_FREQUENCY_UNLIKELY_EXECUTED) | |
f199808c | 3687 | return (use_coal) ? darwin_sections[text_cold_coal_section] |
3688 | : darwin_sections[text_cold_section]; | |
0fbd1542 | 3689 | |
3690 | /* If we have LTO *and* feedback information, then let LTO handle | |
3691 | the function ordering, it makes a better job (for normal, hot, | |
3692 | startup and exit - hence the bailout for cold above). */ | |
3693 | if (in_lto_p && flag_profile_values) | |
3694 | goto default_function_sections; | |
3695 | ||
3696 | /* Non-cold startup code should go to startup subsection. */ | |
3697 | if (startup) | |
f199808c | 3698 | return (use_coal) ? darwin_sections[text_startup_coal_section] |
3699 | : darwin_sections[text_startup_section]; | |
3b73548b | 3700 | |
3701 | /* Similarly for exit. */ | |
0fbd1542 | 3702 | if (exit) |
f199808c | 3703 | return (use_coal) ? darwin_sections[text_exit_coal_section] |
3704 | : darwin_sections[text_exit_section]; | |
0fbd1542 | 3705 | |
3706 | /* Place hot code. */ | |
3707 | if (freq == NODE_FREQUENCY_HOT) | |
f199808c | 3708 | return (use_coal) ? darwin_sections[text_hot_coal_section] |
3709 | : darwin_sections[text_hot_section]; | |
0fbd1542 | 3710 | |
3711 | /* Otherwise, default to the 'normal' non-reordered sections. */ | |
3712 | default_function_sections: | |
f199808c | 3713 | return (use_coal) ? darwin_sections[text_coal_section] |
3714 | : text_section; | |
3b73548b | 3715 | } |
3716 | ||
1f3233d1 | 3717 | #include "gt-darwin.h" |