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07a43492 | 1 | /* General Solaris system support. |
a5544970 | 2 | Copyright (C) 2004-2019 Free Software Foundation, Inc. |
07a43492 DJ |
3 | Contributed by CodeSourcery, LLC. |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
2f83c7d6 | 9 | the Free Software Foundation; either version 3, or (at your option) |
07a43492 DJ |
10 | any later version. |
11 | ||
12 | GCC is distributed in the hope that it will be useful, | |
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 | |
2f83c7d6 NC |
18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
07a43492 DJ |
20 | |
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
e11c4407 AM |
24 | #include "target.h" |
25 | #include "rtl.h" | |
07a43492 | 26 | #include "tree.h" |
4d0cdd0c | 27 | #include "memmodel.h" |
e11c4407 | 28 | #include "tm_p.h" |
d8a2d370 | 29 | #include "stringpool.h" |
314e6352 | 30 | #include "attribs.h" |
e11c4407 | 31 | #include "diagnostic-core.h" |
d8a2d370 | 32 | #include "varasm.h" |
f0c01ffd | 33 | #include "output.h" |
07a43492 DJ |
34 | |
35 | tree solaris_pending_aligns, solaris_pending_inits, solaris_pending_finis; | |
36 | ||
37 | /* Attach any pending attributes for DECL to the list in *ATTRIBUTES. | |
38 | Pending attributes come from #pragma or _Pragma, so this code is | |
39 | only useful in the C family front ends, but it is included in | |
40 | all languages to avoid changing the target machine initializer | |
41 | depending on the language. */ | |
42 | ||
43 | void | |
44 | solaris_insert_attributes (tree decl, tree *attributes) | |
45 | { | |
46 | tree *x, next; | |
47 | ||
48 | if (solaris_pending_aligns != NULL && TREE_CODE (decl) == VAR_DECL) | |
49 | for (x = &solaris_pending_aligns; *x; x = &TREE_CHAIN (*x)) | |
50 | { | |
51 | tree name = TREE_PURPOSE (*x); | |
52 | tree value = TREE_VALUE (*x); | |
53 | if (DECL_NAME (decl) == name) | |
54 | { | |
55 | if (lookup_attribute ("aligned", DECL_ATTRIBUTES (decl)) | |
56 | || lookup_attribute ("aligned", *attributes)) | |
dee15844 JM |
57 | warning (0, "ignoring %<#pragma align%> for explicitly " |
58 | "aligned %q+D", decl); | |
07a43492 DJ |
59 | else |
60 | *attributes = tree_cons (get_identifier ("aligned"), value, | |
61 | *attributes); | |
62 | next = TREE_CHAIN (*x); | |
63 | ggc_free (*x); | |
64 | *x = next; | |
65 | break; | |
66 | } | |
67 | } | |
68 | ||
69 | if (solaris_pending_inits != NULL && TREE_CODE (decl) == FUNCTION_DECL) | |
70 | for (x = &solaris_pending_inits; *x; x = &TREE_CHAIN (*x)) | |
71 | { | |
72 | tree name = TREE_PURPOSE (*x); | |
73 | if (DECL_NAME (decl) == name) | |
74 | { | |
75 | *attributes = tree_cons (get_identifier ("init"), NULL, | |
76 | *attributes); | |
b42186f1 MS |
77 | TREE_USED (decl) = 1; |
78 | DECL_PRESERVE_P (decl) = 1; | |
07a43492 DJ |
79 | next = TREE_CHAIN (*x); |
80 | ggc_free (*x); | |
81 | *x = next; | |
82 | break; | |
83 | } | |
84 | } | |
85 | ||
86 | if (solaris_pending_finis != NULL && TREE_CODE (decl) == FUNCTION_DECL) | |
87 | for (x = &solaris_pending_finis; *x; x = &TREE_CHAIN (*x)) | |
88 | { | |
89 | tree name = TREE_PURPOSE (*x); | |
90 | if (DECL_NAME (decl) == name) | |
91 | { | |
92 | *attributes = tree_cons (get_identifier ("fini"), NULL, | |
93 | *attributes); | |
b42186f1 MS |
94 | TREE_USED (decl) = 1; |
95 | DECL_PRESERVE_P (decl) = 1; | |
07a43492 DJ |
96 | next = TREE_CHAIN (*x); |
97 | ggc_free (*x); | |
98 | *x = next; | |
99 | break; | |
100 | } | |
101 | } | |
102 | } | |
103 | ||
104 | /* Output initializer or finalizer entries for DECL to FILE. */ | |
105 | ||
106 | void | |
107 | solaris_output_init_fini (FILE *file, tree decl) | |
108 | { | |
109 | if (lookup_attribute ("init", DECL_ATTRIBUTES (decl))) | |
110 | { | |
2ca48caa | 111 | fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".init"); |
dbdd0cf3 | 112 | ASM_OUTPUT_CALL (file, decl); |
07a43492 DJ |
113 | fprintf (file, "\t.popsection\n"); |
114 | } | |
115 | ||
116 | if (lookup_attribute ("fini", DECL_ATTRIBUTES (decl))) | |
117 | { | |
2ca48caa | 118 | fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".fini"); |
dbdd0cf3 | 119 | ASM_OUTPUT_CALL (file, decl); |
07a43492 DJ |
120 | fprintf (file, "\t.popsection\n"); |
121 | } | |
122 | } | |
123 | ||
f0c01ffd RO |
124 | /* Emit an assembler directive to set symbol for DECL visibility to |
125 | the visibility type VIS, which must not be VISIBILITY_DEFAULT. */ | |
126 | ||
127 | void | |
7ac3af38 | 128 | solaris_assemble_visibility (tree decl, int vis ATTRIBUTE_UNUSED) |
f0c01ffd | 129 | { |
a93e1899 | 130 | #ifdef HAVE_GAS_HIDDEN |
f0c01ffd RO |
131 | /* Sun as uses .symbolic for STV_PROTECTED. STV_INTERNAL is marked as |
132 | `currently reserved', but the linker treats it like STV_HIDDEN. Sun | |
133 | Studio 12.1 cc emits .hidden instead. | |
134 | ||
135 | There are 3 Sun extensions GCC doesn't yet know about: STV_EXPORTED, | |
136 | STV_SINGLETON, and STV_ELIMINATE. | |
137 | ||
138 | See Linker and Libraries Guide, Ch. 2, Link-Editor, Defining | |
07332e6d RO |
139 | Additional Symbols, and Ch. 7, Object-File Format, Symbol Table |
140 | Section. */ | |
f0c01ffd RO |
141 | |
142 | static const char * const visibility_types[] = { | |
143 | NULL, "symbolic", "hidden", "hidden" | |
144 | }; | |
145 | ||
146 | const char *name, *type; | |
b01e88e5 | 147 | tree id = DECL_ASSEMBLER_NAME (decl); |
f0c01ffd | 148 | |
b01e88e5 IE |
149 | while (IDENTIFIER_TRANSPARENT_ALIAS (id)) |
150 | id = TREE_CHAIN (id); | |
151 | name = IDENTIFIER_POINTER (id); | |
f0c01ffd RO |
152 | type = visibility_types[vis]; |
153 | ||
f0c01ffd RO |
154 | fprintf (asm_out_file, "\t.%s\t", type); |
155 | assemble_name (asm_out_file, name); | |
156 | fprintf (asm_out_file, "\n"); | |
157 | #else | |
7ac3af38 JJ |
158 | if (!DECL_ARTIFICIAL (decl)) |
159 | warning (OPT_Wattributes, "visibility attribute not supported " | |
160 | "in this configuration; ignored"); | |
f0c01ffd RO |
161 | #endif |
162 | } | |
2ca48caa | 163 | |
2ca48caa RO |
164 | /* Group section information entry stored in solaris_comdat_htab. */ |
165 | ||
166 | typedef struct comdat_entry | |
167 | { | |
168 | const char *name; | |
169 | unsigned int flags; | |
170 | tree decl; | |
171 | const char *sig; | |
172 | } comdat_entry; | |
173 | ||
3a4f280b | 174 | /* Helpers for maintaining solaris_comdat_htab. */ |
2ca48caa | 175 | |
8d67ee55 | 176 | struct comdat_entry_hasher : nofree_ptr_hash <comdat_entry> |
3a4f280b | 177 | { |
67f58944 TS |
178 | static inline hashval_t hash (const comdat_entry *); |
179 | static inline bool equal (const comdat_entry *, const comdat_entry *); | |
180 | static inline void remove (comdat_entry *); | |
3a4f280b LC |
181 | }; |
182 | ||
183 | inline hashval_t | |
67f58944 | 184 | comdat_entry_hasher::hash (const comdat_entry *entry) |
2ca48caa | 185 | { |
2ca48caa RO |
186 | return htab_hash_string (entry->sig); |
187 | } | |
188 | ||
3a4f280b | 189 | inline bool |
67f58944 TS |
190 | comdat_entry_hasher::equal (const comdat_entry *entry1, |
191 | const comdat_entry *entry2) | |
2ca48caa | 192 | { |
2ca48caa RO |
193 | return strcmp (entry1->sig, entry2->sig) == 0; |
194 | } | |
195 | ||
3a4f280b LC |
196 | /* Hash table of group signature symbols. */ |
197 | ||
c203e8a7 | 198 | static hash_table<comdat_entry_hasher> *solaris_comdat_htab; |
3a4f280b | 199 | |
2ca48caa RO |
200 | /* Output assembly to switch to COMDAT group section NAME with attributes |
201 | FLAGS and group signature symbol DECL, using Sun as syntax. */ | |
202 | ||
203 | void | |
204 | solaris_elf_asm_comdat_section (const char *name, unsigned int flags, tree decl) | |
205 | { | |
206 | const char *signature; | |
207 | char *section; | |
208 | comdat_entry entry, **slot; | |
209 | ||
210 | if (TREE_CODE (decl) == IDENTIFIER_NODE) | |
211 | signature = IDENTIFIER_POINTER (decl); | |
212 | else | |
213 | signature = IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl)); | |
214 | ||
215 | /* Sun as requires group sections to be fragmented, i.e. to have names of | |
216 | the form <section>%<fragment>. Strictly speaking this is only | |
217 | necessary to support cc -xF, but is enforced globally in violation of | |
218 | the ELF gABI. We keep the section names generated by GCC (generally | |
219 | of the form .text.<signature>) and append %<signature> to pacify as, | |
220 | despite the redundancy. */ | |
221 | section = concat (name, "%", signature, NULL); | |
222 | ||
223 | /* Clear SECTION_LINKONCE flag so targetm.asm_out.named_section only | |
224 | emits this as a regular section. Emit section before .group | |
225 | directive since Sun as treats undeclared sections as @progbits, | |
226 | which conflicts with .bss* sections which are @nobits. */ | |
227 | targetm.asm_out.named_section (section, flags & ~SECTION_LINKONCE, decl); | |
228 | ||
229 | /* Sun as separates declaration of a group section and of the group | |
230 | itself, using the .group directive and the #comdat flag. */ | |
231 | fprintf (asm_out_file, "\t.group\t%s," SECTION_NAME_FORMAT ",#comdat\n", | |
232 | signature, section); | |
233 | ||
234 | /* Unlike GNU as, group signature symbols need to be defined explicitly | |
235 | for Sun as. With a few exceptions, this is already the case. To | |
236 | identify the missing ones without changing the affected frontents, | |
237 | remember the signature symbols and emit those not marked | |
b6193c94 | 238 | TREE_SYMBOL_REFERENCED in solaris_file_end. */ |
c203e8a7 TS |
239 | if (!solaris_comdat_htab) |
240 | solaris_comdat_htab = new hash_table<comdat_entry_hasher> (37); | |
2ca48caa RO |
241 | |
242 | entry.sig = signature; | |
c203e8a7 | 243 | slot = solaris_comdat_htab->find_slot (&entry, INSERT); |
2ca48caa RO |
244 | |
245 | if (*slot == NULL) | |
246 | { | |
247 | *slot = XCNEW (comdat_entry); | |
248 | /* Remember fragmented section name. */ | |
249 | (*slot)->name = section; | |
250 | /* Emit as regular section, .group declaration has already been done. */ | |
251 | (*slot)->flags = flags & ~SECTION_LINKONCE; | |
252 | (*slot)->decl = decl; | |
253 | (*slot)->sig = signature; | |
254 | } | |
255 | } | |
256 | ||
257 | /* Define unreferenced COMDAT group signature symbol corresponding to SLOT. */ | |
258 | ||
3a4f280b LC |
259 | int |
260 | solaris_define_comdat_signature (comdat_entry **slot, | |
261 | void *aux ATTRIBUTE_UNUSED) | |
2ca48caa | 262 | { |
3a4f280b | 263 | comdat_entry *entry = *slot; |
2ca48caa RO |
264 | tree decl = entry->decl; |
265 | ||
266 | if (TREE_CODE (decl) != IDENTIFIER_NODE) | |
267 | decl = DECL_COMDAT_GROUP (decl); | |
268 | ||
269 | if (!TREE_SYMBOL_REFERENCED (decl)) | |
270 | { | |
271 | /* Switch to group section, otherwise Sun as complains | |
272 | `Group Id symbol defined outside of group'. */ | |
273 | switch_to_section (get_section (entry->name, entry->flags, entry->decl)); | |
274 | ||
275 | ASM_OUTPUT_LABEL (asm_out_file, entry->sig); | |
276 | } | |
277 | ||
278 | /* Continue with scan. */ | |
279 | return 1; | |
280 | } | |
281 | ||
282 | /* Emit unreferenced COMDAT group signature symbols for Sun as. */ | |
283 | ||
284 | void | |
b6193c94 | 285 | solaris_file_end (void) |
2ca48caa | 286 | { |
c203e8a7 | 287 | if (!solaris_comdat_htab) |
2ca48caa RO |
288 | return; |
289 | ||
c203e8a7 TS |
290 | solaris_comdat_htab->traverse <void *, solaris_define_comdat_signature> |
291 | (NULL); | |
2ca48caa | 292 | } |
fe551ce4 RO |
293 | |
294 | void | |
295 | solaris_override_options (void) | |
296 | { | |
5022315a RO |
297 | /* Older versions of Solaris ld cannot handle CIE version 3 in .eh_frame. |
298 | Don't emit DWARF3/4 unless specifically selected if so. */ | |
299 | if (!HAVE_LD_EH_FRAME_CIEV3 && !global_options_set.x_dwarf_version) | |
fe551ce4 RO |
300 | dwarf_version = 2; |
301 | } |