1 /* General Solaris system support.
2 Copyright (C) 2004-2022 Free Software Foundation, Inc.
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
9 the Free Software Foundation; either version 3, or (at your option)
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
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 #include "config.h"
22 #include "system.h"
23 #include "coretypes.h"
24 #include "target.h"
25 #include "rtl.h"
26 #include "tree.h"
27 #include "memmodel.h"
28 #include "tm_p.h"
29 #include "stringpool.h"
30 #include "attribs.h"
31 #include "diagnostic-core.h"
32 #include "varasm.h"
33 #include "output.h"
34 #include "opts.h"
35
36 tree solaris_pending_aligns, solaris_pending_inits, solaris_pending_finis;
37
38 /* Attach any pending attributes for DECL to the list in *ATTRIBUTES.
39 Pending attributes come from #pragma or _Pragma, so this code is
40 only useful in the C family front ends, but it is included in
41 all languages to avoid changing the target machine initializer
42 depending on the language. */
43
44 void
solaris_insert_attributes(tree decl,tree * attributes)45 solaris_insert_attributes (tree decl, tree *attributes)
46 {
47 tree *x, next;
48
49 if (solaris_pending_aligns != NULL && TREE_CODE (decl) == VAR_DECL)
50 for (x = &solaris_pending_aligns; *x; x = &TREE_CHAIN (*x))
51 {
52 tree name = TREE_PURPOSE (*x);
53 tree value = TREE_VALUE (*x);
54 if (DECL_NAME (decl) == name)
55 {
56 if (lookup_attribute ("aligned", DECL_ATTRIBUTES (decl))
57 || lookup_attribute ("aligned", *attributes))
58 warning (0, "ignoring %<#pragma align%> for explicitly "
59 "aligned %q+D", decl);
60 else
61 *attributes = tree_cons (get_identifier ("aligned"), value,
62 *attributes);
63 next = TREE_CHAIN (*x);
64 ggc_free (*x);
65 *x = next;
66 break;
67 }
68 }
69
70 if (solaris_pending_inits != NULL && TREE_CODE (decl) == FUNCTION_DECL)
71 for (x = &solaris_pending_inits; *x; x = &TREE_CHAIN (*x))
72 {
73 tree name = TREE_PURPOSE (*x);
74 if (DECL_NAME (decl) == name)
75 {
76 *attributes = tree_cons (get_identifier ("init"), NULL,
77 *attributes);
78 TREE_USED (decl) = 1;
79 DECL_PRESERVE_P (decl) = 1;
80 next = TREE_CHAIN (*x);
81 ggc_free (*x);
82 *x = next;
83 break;
84 }
85 }
86
87 if (solaris_pending_finis != NULL && TREE_CODE (decl) == FUNCTION_DECL)
88 for (x = &solaris_pending_finis; *x; x = &TREE_CHAIN (*x))
89 {
90 tree name = TREE_PURPOSE (*x);
91 if (DECL_NAME (decl) == name)
92 {
93 *attributes = tree_cons (get_identifier ("fini"), NULL,
94 *attributes);
95 TREE_USED (decl) = 1;
96 DECL_PRESERVE_P (decl) = 1;
97 next = TREE_CHAIN (*x);
98 ggc_free (*x);
99 *x = next;
100 break;
101 }
102 }
103 }
104
105 /* Output initializer or finalizer entries for DECL to FILE. */
106
107 void
solaris_output_init_fini(FILE * file,tree decl)108 solaris_output_init_fini (FILE *file, tree decl)
109 {
110 if (lookup_attribute ("init", DECL_ATTRIBUTES (decl)))
111 {
112 fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".init");
113 ASM_OUTPUT_CALL (file, decl);
114 fprintf (file, "\t.popsection\n");
115 }
116
117 if (lookup_attribute ("fini", DECL_ATTRIBUTES (decl)))
118 {
119 fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".fini");
120 ASM_OUTPUT_CALL (file, decl);
121 fprintf (file, "\t.popsection\n");
122 }
123 }
124
125 /* Emit an assembler directive to set symbol for DECL visibility to
126 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
127
128 void
solaris_assemble_visibility(tree decl,int vis ATTRIBUTE_UNUSED)129 solaris_assemble_visibility (tree decl, int vis ATTRIBUTE_UNUSED)
130 {
131 #ifdef HAVE_GAS_HIDDEN
132 /* Sun as uses .symbolic for STV_PROTECTED. STV_INTERNAL is marked as
133 `currently reserved', but the linker treats it like STV_HIDDEN. Sun
134 Studio 12.1 cc emits .hidden instead.
135
136 There are 3 Sun extensions GCC doesn't yet know about: STV_EXPORTED,
137 STV_SINGLETON, and STV_ELIMINATE.
138
139 See Linker and Libraries Guide, Ch. 2, Link-Editor, Defining
140 Additional Symbols, and Ch. 7, Object-File Format, Symbol Table
141 Section. */
142
143 static const char * const visibility_types[] = {
144 NULL, "symbolic", "hidden", "hidden"
145 };
146
147 const char *name, *type;
148 tree id = DECL_ASSEMBLER_NAME (decl);
149
150 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
151 id = TREE_CHAIN (id);
152 name = IDENTIFIER_POINTER (id);
153 type = visibility_types[vis];
154
155 fprintf (asm_out_file, "\t.%s\t", type);
156 assemble_name (asm_out_file, name);
157 fprintf (asm_out_file, "\n");
158 #else
159 if (!DECL_ARTIFICIAL (decl))
160 warning (OPT_Wattributes, "visibility attribute not supported "
161 "in this configuration; ignored");
162 #endif
163 }
164
165 /* Group section information entry stored in solaris_comdat_htab. */
166
167 typedef struct comdat_entry
168 {
169 const char *name;
170 unsigned int flags;
171 tree decl;
172 const char *sig;
173 } comdat_entry;
174
175 /* Helpers for maintaining solaris_comdat_htab. */
176
177 struct comdat_entry_hasher : nofree_ptr_hash <comdat_entry>
178 {
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 *);
182 };
183
184 inline hashval_t
hash(const comdat_entry * entry)185 comdat_entry_hasher::hash (const comdat_entry *entry)
186 {
187 return htab_hash_string (entry->sig);
188 }
189
190 inline bool
equal(const comdat_entry * entry1,const comdat_entry * entry2)191 comdat_entry_hasher::equal (const comdat_entry *entry1,
192 const comdat_entry *entry2)
193 {
194 return strcmp (entry1->sig, entry2->sig) == 0;
195 }
196
197 /* Hash table of group signature symbols. */
198
199 static hash_table<comdat_entry_hasher> *solaris_comdat_htab;
200
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
solaris_elf_asm_comdat_section(const char * name,unsigned int flags,tree decl)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
239 TREE_SYMBOL_REFERENCED in solaris_file_end. */
240 if (!solaris_comdat_htab)
241 solaris_comdat_htab = new hash_table<comdat_entry_hasher> (37);
242
243 entry.sig = signature;
244 slot = solaris_comdat_htab->find_slot (&entry, INSERT);
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
260 int
solaris_define_comdat_signature(comdat_entry ** slot,void * aux ATTRIBUTE_UNUSED)261 solaris_define_comdat_signature (comdat_entry **slot,
262 void *aux ATTRIBUTE_UNUSED)
263 {
264 comdat_entry *entry = *slot;
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
solaris_file_end(void)286 solaris_file_end (void)
287 {
288 if (!solaris_comdat_htab)
289 return;
290
291 solaris_comdat_htab->traverse <void *, solaris_define_comdat_signature>
292 (NULL);
293 }
294
295 void
solaris_override_options(void)296 solaris_override_options (void)
297 {
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 && !OPTION_SET_P (dwarf_version))
301 dwarf_version = 2;
302 }
303