1 /* General Solaris system support.
2 Copyright (C) 2004-2015 Free Software Foundation, Inc.
3 Contributed by CodeSourcery, LLC.
5 This file is part of GCC.
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)
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.
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/>. */
23 #include "coretypes.h"
29 #include "stringpool.h"
36 #include "diagnostic-core.h"
38 tree solaris_pending_aligns
, solaris_pending_inits
, solaris_pending_finis
;
40 /* Attach any pending attributes for DECL to the list in *ATTRIBUTES.
41 Pending attributes come from #pragma or _Pragma, so this code is
42 only useful in the C family front ends, but it is included in
43 all languages to avoid changing the target machine initializer
44 depending on the language. */
47 solaris_insert_attributes (tree decl
, tree
*attributes
)
51 if (solaris_pending_aligns
!= NULL
&& TREE_CODE (decl
) == VAR_DECL
)
52 for (x
= &solaris_pending_aligns
; *x
; x
= &TREE_CHAIN (*x
))
54 tree name
= TREE_PURPOSE (*x
);
55 tree value
= TREE_VALUE (*x
);
56 if (DECL_NAME (decl
) == name
)
58 if (lookup_attribute ("aligned", DECL_ATTRIBUTES (decl
))
59 || lookup_attribute ("aligned", *attributes
))
60 warning (0, "ignoring %<#pragma align%> for explicitly "
61 "aligned %q+D", decl
);
63 *attributes
= tree_cons (get_identifier ("aligned"), value
,
65 next
= TREE_CHAIN (*x
);
72 if (solaris_pending_inits
!= NULL
&& TREE_CODE (decl
) == FUNCTION_DECL
)
73 for (x
= &solaris_pending_inits
; *x
; x
= &TREE_CHAIN (*x
))
75 tree name
= TREE_PURPOSE (*x
);
76 if (DECL_NAME (decl
) == name
)
78 *attributes
= tree_cons (get_identifier ("init"), NULL
,
81 DECL_PRESERVE_P (decl
) = 1;
82 next
= TREE_CHAIN (*x
);
89 if (solaris_pending_finis
!= NULL
&& TREE_CODE (decl
) == FUNCTION_DECL
)
90 for (x
= &solaris_pending_finis
; *x
; x
= &TREE_CHAIN (*x
))
92 tree name
= TREE_PURPOSE (*x
);
93 if (DECL_NAME (decl
) == name
)
95 *attributes
= tree_cons (get_identifier ("fini"), NULL
,
98 DECL_PRESERVE_P (decl
) = 1;
99 next
= TREE_CHAIN (*x
);
107 /* Output initializer or finalizer entries for DECL to FILE. */
110 solaris_output_init_fini (FILE *file
, tree decl
)
112 if (lookup_attribute ("init", DECL_ATTRIBUTES (decl
)))
114 fprintf (file
, "\t.pushsection\t" SECTION_NAME_FORMAT
"\n", ".init");
115 ASM_OUTPUT_CALL (file
, decl
);
116 fprintf (file
, "\t.popsection\n");
119 if (lookup_attribute ("fini", DECL_ATTRIBUTES (decl
)))
121 fprintf (file
, "\t.pushsection\t" SECTION_NAME_FORMAT
"\n", ".fini");
122 ASM_OUTPUT_CALL (file
, decl
);
123 fprintf (file
, "\t.popsection\n");
127 /* Emit an assembler directive to set symbol for DECL visibility to
128 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
131 solaris_assemble_visibility (tree decl
, int vis ATTRIBUTE_UNUSED
)
133 #ifdef HAVE_GAS_HIDDEN
134 /* Sun as uses .symbolic for STV_PROTECTED. STV_INTERNAL is marked as
135 `currently reserved', but the linker treats it like STV_HIDDEN. Sun
136 Studio 12.1 cc emits .hidden instead.
138 There are 3 Sun extensions GCC doesn't yet know about: STV_EXPORTED,
139 STV_SINGLETON, and STV_ELIMINATE.
141 See Linker and Libraries Guide, Ch. 2, Link-Editor, Defining
142 Additional Symbols, and Ch. 7, Object-File Format, Symbol Table
145 static const char * const visibility_types
[] = {
146 NULL
, "symbolic", "hidden", "hidden"
149 const char *name
, *type
;
151 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
152 type
= visibility_types
[vis
];
154 fprintf (asm_out_file
, "\t.%s\t", type
);
155 assemble_name (asm_out_file
, name
);
156 fprintf (asm_out_file
, "\n");
158 if (!DECL_ARTIFICIAL (decl
))
159 warning (OPT_Wattributes
, "visibility attribute not supported "
160 "in this configuration; ignored");
164 /* Group section information entry stored in solaris_comdat_htab. */
166 typedef struct comdat_entry
174 /* Helpers for maintaining solaris_comdat_htab. */
176 struct comdat_entry_hasher
: typed_noop_remove
<comdat_entry
>
178 typedef comdat_entry
*value_type
;
179 typedef comdat_entry
*compare_type
;
180 static inline hashval_t
hash (const comdat_entry
*);
181 static inline bool equal (const comdat_entry
*, const comdat_entry
*);
182 static inline void remove (comdat_entry
*);
186 comdat_entry_hasher::hash (const comdat_entry
*entry
)
188 return htab_hash_string (entry
->sig
);
192 comdat_entry_hasher::equal (const comdat_entry
*entry1
,
193 const comdat_entry
*entry2
)
195 return strcmp (entry1
->sig
, entry2
->sig
) == 0;
198 /* Hash table of group signature symbols. */
200 static hash_table
<comdat_entry_hasher
> *solaris_comdat_htab
;
202 /* Output assembly to switch to COMDAT group section NAME with attributes
203 FLAGS and group signature symbol DECL, using Sun as syntax. */
206 solaris_elf_asm_comdat_section (const char *name
, unsigned int flags
, tree decl
)
208 const char *signature
;
210 comdat_entry entry
, **slot
;
212 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
213 signature
= IDENTIFIER_POINTER (decl
);
215 signature
= IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
));
217 /* Sun as requires group sections to be fragmented, i.e. to have names of
218 the form <section>%<fragment>. Strictly speaking this is only
219 necessary to support cc -xF, but is enforced globally in violation of
220 the ELF gABI. We keep the section names generated by GCC (generally
221 of the form .text.<signature>) and append %<signature> to pacify as,
222 despite the redundancy. */
223 section
= concat (name
, "%", signature
, NULL
);
225 /* Clear SECTION_LINKONCE flag so targetm.asm_out.named_section only
226 emits this as a regular section. Emit section before .group
227 directive since Sun as treats undeclared sections as @progbits,
228 which conflicts with .bss* sections which are @nobits. */
229 targetm
.asm_out
.named_section (section
, flags
& ~SECTION_LINKONCE
, decl
);
231 /* Sun as separates declaration of a group section and of the group
232 itself, using the .group directive and the #comdat flag. */
233 fprintf (asm_out_file
, "\t.group\t%s," SECTION_NAME_FORMAT
",#comdat\n",
236 /* Unlike GNU as, group signature symbols need to be defined explicitly
237 for Sun as. With a few exceptions, this is already the case. To
238 identify the missing ones without changing the affected frontents,
239 remember the signature symbols and emit those not marked
240 TREE_SYMBOL_REFERENCED in solaris_file_end. */
241 if (!solaris_comdat_htab
)
242 solaris_comdat_htab
= new hash_table
<comdat_entry_hasher
> (37);
244 entry
.sig
= signature
;
245 slot
= solaris_comdat_htab
->find_slot (&entry
, INSERT
);
249 *slot
= XCNEW (comdat_entry
);
250 /* Remember fragmented section name. */
251 (*slot
)->name
= section
;
252 /* Emit as regular section, .group declaration has already been done. */
253 (*slot
)->flags
= flags
& ~SECTION_LINKONCE
;
254 (*slot
)->decl
= decl
;
255 (*slot
)->sig
= signature
;
259 /* Define unreferenced COMDAT group signature symbol corresponding to SLOT. */
262 solaris_define_comdat_signature (comdat_entry
**slot
,
263 void *aux ATTRIBUTE_UNUSED
)
265 comdat_entry
*entry
= *slot
;
266 tree decl
= entry
->decl
;
268 if (TREE_CODE (decl
) != IDENTIFIER_NODE
)
269 decl
= DECL_COMDAT_GROUP (decl
);
271 if (!TREE_SYMBOL_REFERENCED (decl
))
273 /* Switch to group section, otherwise Sun as complains
274 `Group Id symbol defined outside of group'. */
275 switch_to_section (get_section (entry
->name
, entry
->flags
, entry
->decl
));
277 ASM_OUTPUT_LABEL (asm_out_file
, entry
->sig
);
280 /* Continue with scan. */
284 /* Emit unreferenced COMDAT group signature symbols for Sun as. */
287 solaris_file_end (void)
289 if (!solaris_comdat_htab
)
292 solaris_comdat_htab
->traverse
<void *, solaris_define_comdat_signature
>
297 solaris_override_options (void)
299 /* Older versions of Solaris ld cannot handle CIE version 3 in .eh_frame.
300 Don't emit DWARF3/4 unless specifically selected if so. */
301 if (!HAVE_LD_EH_FRAME_CIEV3
&& !global_options_set
.x_dwarf_version
)