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e02a1225 | 1 | /* General Solaris system support. |
d353bf18 | 2 | Copyright (C) 2004-2015 Free Software Foundation, Inc. |
e02a1225 | 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 | |
038d1e19 | 9 | the Free Software Foundation; either version 3, or (at your option) |
e02a1225 | 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 | |
038d1e19 | 18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
e02a1225 | 20 | |
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
b20a8bb4 | 24 | #include "alias.h" |
25 | #include "symtab.h" | |
26 | #include "options.h" | |
e02a1225 | 27 | #include "tree.h" |
9ed99284 | 28 | #include "stringpool.h" |
29 | #include "varasm.h" | |
dc2059b5 | 30 | #include "output.h" |
e02a1225 | 31 | #include "tm.h" |
d960da42 | 32 | #include "rtl.h" |
b82b45b4 | 33 | #include "target.h" |
e02a1225 | 34 | #include "tm_p.h" |
0b205f4c | 35 | #include "diagnostic-core.h" |
e02a1225 | 36 | |
37 | tree solaris_pending_aligns, solaris_pending_inits, solaris_pending_finis; | |
38 | ||
39 | /* Attach any pending attributes for DECL to the list in *ATTRIBUTES. | |
40 | Pending attributes come from #pragma or _Pragma, so this code is | |
41 | only useful in the C family front ends, but it is included in | |
42 | all languages to avoid changing the target machine initializer | |
43 | depending on the language. */ | |
44 | ||
45 | void | |
46 | solaris_insert_attributes (tree decl, tree *attributes) | |
47 | { | |
48 | tree *x, next; | |
49 | ||
50 | if (solaris_pending_aligns != NULL && TREE_CODE (decl) == VAR_DECL) | |
51 | for (x = &solaris_pending_aligns; *x; x = &TREE_CHAIN (*x)) | |
52 | { | |
53 | tree name = TREE_PURPOSE (*x); | |
54 | tree value = TREE_VALUE (*x); | |
55 | if (DECL_NAME (decl) == name) | |
56 | { | |
57 | if (lookup_attribute ("aligned", DECL_ATTRIBUTES (decl)) | |
58 | || lookup_attribute ("aligned", *attributes)) | |
3cf8b391 | 59 | warning (0, "ignoring %<#pragma align%> for explicitly " |
60 | "aligned %q+D", decl); | |
e02a1225 | 61 | else |
62 | *attributes = tree_cons (get_identifier ("aligned"), value, | |
63 | *attributes); | |
64 | next = TREE_CHAIN (*x); | |
65 | ggc_free (*x); | |
66 | *x = next; | |
67 | break; | |
68 | } | |
69 | } | |
70 | ||
71 | if (solaris_pending_inits != NULL && TREE_CODE (decl) == FUNCTION_DECL) | |
72 | for (x = &solaris_pending_inits; *x; x = &TREE_CHAIN (*x)) | |
73 | { | |
74 | tree name = TREE_PURPOSE (*x); | |
75 | if (DECL_NAME (decl) == name) | |
76 | { | |
77 | *attributes = tree_cons (get_identifier ("init"), NULL, | |
78 | *attributes); | |
83a23b05 | 79 | TREE_USED (decl) = 1; |
80 | DECL_PRESERVE_P (decl) = 1; | |
e02a1225 | 81 | next = TREE_CHAIN (*x); |
82 | ggc_free (*x); | |
83 | *x = next; | |
84 | break; | |
85 | } | |
86 | } | |
87 | ||
88 | if (solaris_pending_finis != NULL && TREE_CODE (decl) == FUNCTION_DECL) | |
89 | for (x = &solaris_pending_finis; *x; x = &TREE_CHAIN (*x)) | |
90 | { | |
91 | tree name = TREE_PURPOSE (*x); | |
92 | if (DECL_NAME (decl) == name) | |
93 | { | |
94 | *attributes = tree_cons (get_identifier ("fini"), NULL, | |
95 | *attributes); | |
83a23b05 | 96 | TREE_USED (decl) = 1; |
97 | DECL_PRESERVE_P (decl) = 1; | |
e02a1225 | 98 | next = TREE_CHAIN (*x); |
99 | ggc_free (*x); | |
100 | *x = next; | |
101 | break; | |
102 | } | |
103 | } | |
104 | } | |
105 | ||
106 | /* Output initializer or finalizer entries for DECL to FILE. */ | |
107 | ||
108 | void | |
109 | solaris_output_init_fini (FILE *file, tree decl) | |
110 | { | |
111 | if (lookup_attribute ("init", DECL_ATTRIBUTES (decl))) | |
112 | { | |
3468b0d6 | 113 | fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".init"); |
d960da42 | 114 | ASM_OUTPUT_CALL (file, decl); |
e02a1225 | 115 | fprintf (file, "\t.popsection\n"); |
116 | } | |
117 | ||
118 | if (lookup_attribute ("fini", DECL_ATTRIBUTES (decl))) | |
119 | { | |
3468b0d6 | 120 | fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".fini"); |
d960da42 | 121 | ASM_OUTPUT_CALL (file, decl); |
e02a1225 | 122 | fprintf (file, "\t.popsection\n"); |
123 | } | |
124 | } | |
125 | ||
dc2059b5 | 126 | /* Emit an assembler directive to set symbol for DECL visibility to |
127 | the visibility type VIS, which must not be VISIBILITY_DEFAULT. */ | |
128 | ||
129 | void | |
4475ab54 | 130 | solaris_assemble_visibility (tree decl, int vis ATTRIBUTE_UNUSED) |
dc2059b5 | 131 | { |
cbbd336d | 132 | #ifdef HAVE_GAS_HIDDEN |
dc2059b5 | 133 | /* Sun as uses .symbolic for STV_PROTECTED. STV_INTERNAL is marked as |
134 | `currently reserved', but the linker treats it like STV_HIDDEN. Sun | |
135 | Studio 12.1 cc emits .hidden instead. | |
136 | ||
137 | There are 3 Sun extensions GCC doesn't yet know about: STV_EXPORTED, | |
138 | STV_SINGLETON, and STV_ELIMINATE. | |
139 | ||
140 | See Linker and Libraries Guide, Ch. 2, Link-Editor, Defining | |
a6d6d956 | 141 | Additional Symbols, and Ch. 7, Object-File Format, Symbol Table |
142 | Section. */ | |
dc2059b5 | 143 | |
144 | static const char * const visibility_types[] = { | |
145 | NULL, "symbolic", "hidden", "hidden" | |
146 | }; | |
147 | ||
148 | const char *name, *type; | |
149 | ||
150 | name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); | |
151 | type = visibility_types[vis]; | |
152 | ||
dc2059b5 | 153 | fprintf (asm_out_file, "\t.%s\t", type); |
154 | assemble_name (asm_out_file, name); | |
155 | fprintf (asm_out_file, "\n"); | |
156 | #else | |
4475ab54 | 157 | if (!DECL_ARTIFICIAL (decl)) |
158 | warning (OPT_Wattributes, "visibility attribute not supported " | |
159 | "in this configuration; ignored"); | |
dc2059b5 | 160 | #endif |
161 | } | |
3468b0d6 | 162 | |
3468b0d6 | 163 | /* Group section information entry stored in solaris_comdat_htab. */ |
164 | ||
165 | typedef struct comdat_entry | |
166 | { | |
167 | const char *name; | |
168 | unsigned int flags; | |
169 | tree decl; | |
170 | const char *sig; | |
171 | } comdat_entry; | |
172 | ||
7b7a707b | 173 | /* Helpers for maintaining solaris_comdat_htab. */ |
3468b0d6 | 174 | |
7b7a707b | 175 | struct comdat_entry_hasher : typed_noop_remove <comdat_entry> |
176 | { | |
9969c043 | 177 | typedef comdat_entry *value_type; |
178 | typedef comdat_entry *compare_type; | |
179 | static inline hashval_t hash (const comdat_entry *); | |
180 | static inline bool equal (const comdat_entry *, const comdat_entry *); | |
181 | static inline void remove (comdat_entry *); | |
7b7a707b | 182 | }; |
183 | ||
184 | inline hashval_t | |
9969c043 | 185 | comdat_entry_hasher::hash (const comdat_entry *entry) |
3468b0d6 | 186 | { |
3468b0d6 | 187 | return htab_hash_string (entry->sig); |
188 | } | |
189 | ||
7b7a707b | 190 | inline bool |
9969c043 | 191 | comdat_entry_hasher::equal (const comdat_entry *entry1, |
192 | const comdat_entry *entry2) | |
3468b0d6 | 193 | { |
3468b0d6 | 194 | return strcmp (entry1->sig, entry2->sig) == 0; |
195 | } | |
196 | ||
7b7a707b | 197 | /* Hash table of group signature symbols. */ |
198 | ||
c1f445d2 | 199 | static hash_table<comdat_entry_hasher> *solaris_comdat_htab; |
7b7a707b | 200 | |
3468b0d6 | 201 | /* Output assembly to switch to COMDAT group section NAME with attributes |
202 | FLAGS and group signature symbol DECL, using Sun as syntax. */ | |
203 | ||
204 | void | |
205 | solaris_elf_asm_comdat_section (const char *name, unsigned int flags, tree decl) | |
206 | { | |
207 | const char *signature; | |
208 | char *section; | |
209 | comdat_entry entry, **slot; | |
210 | ||
211 | if (TREE_CODE (decl) == IDENTIFIER_NODE) | |
212 | signature = IDENTIFIER_POINTER (decl); | |
213 | else | |
214 | signature = IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl)); | |
215 | ||
216 | /* Sun as requires group sections to be fragmented, i.e. to have names of | |
217 | the form <section>%<fragment>. Strictly speaking this is only | |
218 | necessary to support cc -xF, but is enforced globally in violation of | |
219 | the ELF gABI. We keep the section names generated by GCC (generally | |
220 | of the form .text.<signature>) and append %<signature> to pacify as, | |
221 | despite the redundancy. */ | |
222 | section = concat (name, "%", signature, NULL); | |
223 | ||
224 | /* Clear SECTION_LINKONCE flag so targetm.asm_out.named_section only | |
225 | emits this as a regular section. Emit section before .group | |
226 | directive since Sun as treats undeclared sections as @progbits, | |
227 | which conflicts with .bss* sections which are @nobits. */ | |
228 | targetm.asm_out.named_section (section, flags & ~SECTION_LINKONCE, decl); | |
229 | ||
230 | /* Sun as separates declaration of a group section and of the group | |
231 | itself, using the .group directive and the #comdat flag. */ | |
232 | fprintf (asm_out_file, "\t.group\t%s," SECTION_NAME_FORMAT ",#comdat\n", | |
233 | signature, section); | |
234 | ||
235 | /* Unlike GNU as, group signature symbols need to be defined explicitly | |
236 | for Sun as. With a few exceptions, this is already the case. To | |
237 | identify the missing ones without changing the affected frontents, | |
238 | remember the signature symbols and emit those not marked | |
76005733 | 239 | TREE_SYMBOL_REFERENCED in solaris_file_end. */ |
c1f445d2 | 240 | if (!solaris_comdat_htab) |
241 | solaris_comdat_htab = new hash_table<comdat_entry_hasher> (37); | |
3468b0d6 | 242 | |
243 | entry.sig = signature; | |
c1f445d2 | 244 | slot = solaris_comdat_htab->find_slot (&entry, INSERT); |
3468b0d6 | 245 | |
246 | if (*slot == NULL) | |
247 | { | |
248 | *slot = XCNEW (comdat_entry); | |
249 | /* Remember fragmented section name. */ | |
250 | (*slot)->name = section; | |
251 | /* Emit as regular section, .group declaration has already been done. */ | |
252 | (*slot)->flags = flags & ~SECTION_LINKONCE; | |
253 | (*slot)->decl = decl; | |
254 | (*slot)->sig = signature; | |
255 | } | |
256 | } | |
257 | ||
258 | /* Define unreferenced COMDAT group signature symbol corresponding to SLOT. */ | |
259 | ||
7b7a707b | 260 | int |
261 | solaris_define_comdat_signature (comdat_entry **slot, | |
262 | void *aux ATTRIBUTE_UNUSED) | |
3468b0d6 | 263 | { |
7b7a707b | 264 | comdat_entry *entry = *slot; |
3468b0d6 | 265 | tree decl = entry->decl; |
266 | ||
267 | if (TREE_CODE (decl) != IDENTIFIER_NODE) | |
268 | decl = DECL_COMDAT_GROUP (decl); | |
269 | ||
270 | if (!TREE_SYMBOL_REFERENCED (decl)) | |
271 | { | |
272 | /* Switch to group section, otherwise Sun as complains | |
273 | `Group Id symbol defined outside of group'. */ | |
274 | switch_to_section (get_section (entry->name, entry->flags, entry->decl)); | |
275 | ||
276 | ASM_OUTPUT_LABEL (asm_out_file, entry->sig); | |
277 | } | |
278 | ||
279 | /* Continue with scan. */ | |
280 | return 1; | |
281 | } | |
282 | ||
283 | /* Emit unreferenced COMDAT group signature symbols for Sun as. */ | |
284 | ||
285 | void | |
76005733 | 286 | solaris_file_end (void) |
3468b0d6 | 287 | { |
c1f445d2 | 288 | if (!solaris_comdat_htab) |
3468b0d6 | 289 | return; |
290 | ||
c1f445d2 | 291 | solaris_comdat_htab->traverse <void *, solaris_define_comdat_signature> |
292 | (NULL); | |
3468b0d6 | 293 | } |
db66903a | 294 | |
295 | void | |
296 | solaris_override_options (void) | |
297 | { | |
75d28287 | 298 | /* Older versions of Solaris ld cannot handle CIE version 3 in .eh_frame. |
299 | Don't emit DWARF3/4 unless specifically selected if so. */ | |
300 | if (!HAVE_LD_EH_FRAME_CIEV3 && !global_options_set.x_dwarf_version) | |
db66903a | 301 | dwarf_version = 2; |
302 | } |