1 /* General Solaris system support.
2 Copyright (C) 2004-2018 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
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
solaris_insert_attributes(tree decl,tree * attributes)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))
57 warning (0, "ignoring %<#pragma align%> for explicitly "
58 "aligned %q+D", decl);
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);
77 TREE_USED (decl) = 1;
78 DECL_PRESERVE_P (decl) = 1;
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);
94 TREE_USED (decl) = 1;
95 DECL_PRESERVE_P (decl) = 1;
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
solaris_output_init_fini(FILE * file,tree decl)107 solaris_output_init_fini (FILE *file, tree decl)
108 {
109 if (lookup_attribute ("init", DECL_ATTRIBUTES (decl)))
110 {
111 fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".init");
112 ASM_OUTPUT_CALL (file, decl);
113 fprintf (file, "\t.popsection\n");
114 }
115
116 if (lookup_attribute ("fini", DECL_ATTRIBUTES (decl)))
117 {
118 fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".fini");
119 ASM_OUTPUT_CALL (file, decl);
120 fprintf (file, "\t.popsection\n");
121 }
122 }
123
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
solaris_assemble_visibility(tree decl,int vis ATTRIBUTE_UNUSED)128 solaris_assemble_visibility (tree decl, int vis ATTRIBUTE_UNUSED)
129 {
130 #ifdef HAVE_GAS_HIDDEN
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
139 Additional Symbols, and Ch. 7, Object-File Format, Symbol Table
140 Section. */
141
142 static const char * const visibility_types[] = {
143 NULL, "symbolic", "hidden", "hidden"
144 };
145
146 const char *name, *type;
147 tree id = DECL_ASSEMBLER_NAME (decl);
148
149 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
150 id = TREE_CHAIN (id);
151 name = IDENTIFIER_POINTER (id);
152 type = visibility_types[vis];
153
154 fprintf (asm_out_file, "\t.%s\t", type);
155 assemble_name (asm_out_file, name);
156 fprintf (asm_out_file, "\n");
157 #else
158 if (!DECL_ARTIFICIAL (decl))
159 warning (OPT_Wattributes, "visibility attribute not supported "
160 "in this configuration; ignored");
161 #endif
162 }
163
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
174 /* Helpers for maintaining solaris_comdat_htab. */
175
176 struct comdat_entry_hasher : nofree_ptr_hash <comdat_entry>
177 {
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 *);
181 };
182
183 inline hashval_t
hash(const comdat_entry * entry)184 comdat_entry_hasher::hash (const comdat_entry *entry)
185 {
186 return htab_hash_string (entry->sig);
187 }
188
189 inline bool
equal(const comdat_entry * entry1,const comdat_entry * entry2)190 comdat_entry_hasher::equal (const comdat_entry *entry1,
191 const comdat_entry *entry2)
192 {
193 return strcmp (entry1->sig, entry2->sig) == 0;
194 }
195
196 /* Hash table of group signature symbols. */
197
198 static hash_table<comdat_entry_hasher> *solaris_comdat_htab;
199
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
solaris_elf_asm_comdat_section(const char * name,unsigned int flags,tree decl)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
238 TREE_SYMBOL_REFERENCED in solaris_file_end. */
239 if (!solaris_comdat_htab)
240 solaris_comdat_htab = new hash_table<comdat_entry_hasher> (37);
241
242 entry.sig = signature;
243 slot = solaris_comdat_htab->find_slot (&entry, INSERT);
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
259 int
solaris_define_comdat_signature(comdat_entry ** slot,void * aux ATTRIBUTE_UNUSED)260 solaris_define_comdat_signature (comdat_entry **slot,
261 void *aux ATTRIBUTE_UNUSED)
262 {
263 comdat_entry *entry = *slot;
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
solaris_file_end(void)285 solaris_file_end (void)
286 {
287 if (!solaris_comdat_htab)
288 return;
289
290 solaris_comdat_htab->traverse <void *, solaris_define_comdat_signature>
291 (NULL);
292 }
293
294 void
solaris_override_options(void)295 solaris_override_options (void)
296 {
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)
300 dwarf_version = 2;
301 }
302