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/* General Solaris system support.
Copyright (C) 2004-2015 Free Software Foundation, Inc.
Contributed by CodeSourcery, LLC.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "hash-set.h"
#include "machmode.h"
#include "vec.h"
#include "double-int.h"
#include "input.h"
#include "alias.h"
#include "symtab.h"
#include "options.h"
#include "wide-int.h"
#include "inchash.h"
#include "tree.h"
#include "stringpool.h"
#include "varasm.h"
#include "output.h"
#include "tm.h"
#include "rtl.h"
#include "target.h"
#include "tm_p.h"
#include "diagnostic-core.h"
#include "ggc.h"
#include "hash-table.h"
tree solaris_pending_aligns, solaris_pending_inits, solaris_pending_finis;
/* Attach any pending attributes for DECL to the list in *ATTRIBUTES.
Pending attributes come from #pragma or _Pragma, so this code is
only useful in the C family front ends, but it is included in
all languages to avoid changing the target machine initializer
depending on the language. */
void
solaris_insert_attributes (tree decl, tree *attributes)
{
tree *x, next;
if (solaris_pending_aligns != NULL && TREE_CODE (decl) == VAR_DECL)
for (x = &solaris_pending_aligns; *x; x = &TREE_CHAIN (*x))
{
tree name = TREE_PURPOSE (*x);
tree value = TREE_VALUE (*x);
if (DECL_NAME (decl) == name)
{
if (lookup_attribute ("aligned", DECL_ATTRIBUTES (decl))
|| lookup_attribute ("aligned", *attributes))
warning (0, "ignoring %<#pragma align%> for explicitly "
"aligned %q+D", decl);
else
*attributes = tree_cons (get_identifier ("aligned"), value,
*attributes);
next = TREE_CHAIN (*x);
ggc_free (*x);
*x = next;
break;
}
}
if (solaris_pending_inits != NULL && TREE_CODE (decl) == FUNCTION_DECL)
for (x = &solaris_pending_inits; *x; x = &TREE_CHAIN (*x))
{
tree name = TREE_PURPOSE (*x);
if (DECL_NAME (decl) == name)
{
*attributes = tree_cons (get_identifier ("init"), NULL,
*attributes);
TREE_USED (decl) = 1;
DECL_PRESERVE_P (decl) = 1;
next = TREE_CHAIN (*x);
ggc_free (*x);
*x = next;
break;
}
}
if (solaris_pending_finis != NULL && TREE_CODE (decl) == FUNCTION_DECL)
for (x = &solaris_pending_finis; *x; x = &TREE_CHAIN (*x))
{
tree name = TREE_PURPOSE (*x);
if (DECL_NAME (decl) == name)
{
*attributes = tree_cons (get_identifier ("fini"), NULL,
*attributes);
TREE_USED (decl) = 1;
DECL_PRESERVE_P (decl) = 1;
next = TREE_CHAIN (*x);
ggc_free (*x);
*x = next;
break;
}
}
}
/* Output initializer or finalizer entries for DECL to FILE. */
void
solaris_output_init_fini (FILE *file, tree decl)
{
if (lookup_attribute ("init", DECL_ATTRIBUTES (decl)))
{
fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".init");
ASM_OUTPUT_CALL (file, decl);
fprintf (file, "\t.popsection\n");
}
if (lookup_attribute ("fini", DECL_ATTRIBUTES (decl)))
{
fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".fini");
ASM_OUTPUT_CALL (file, decl);
fprintf (file, "\t.popsection\n");
}
}
/* Emit an assembler directive to set symbol for DECL visibility to
the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
void
solaris_assemble_visibility (tree decl, int vis ATTRIBUTE_UNUSED)
{
#ifdef HAVE_GAS_HIDDEN
/* Sun as uses .symbolic for STV_PROTECTED. STV_INTERNAL is marked as
`currently reserved', but the linker treats it like STV_HIDDEN. Sun
Studio 12.1 cc emits .hidden instead.
There are 3 Sun extensions GCC doesn't yet know about: STV_EXPORTED,
STV_SINGLETON, and STV_ELIMINATE.
See Linker and Libraries Guide, Ch. 2, Link-Editor, Defining
Additional Symbols, and Ch. 7, Object-File Format, Symbol Table
Section. */
static const char * const visibility_types[] = {
NULL, "symbolic", "hidden", "hidden"
};
const char *name, *type;
tree id = DECL_ASSEMBLER_NAME (decl);
while (IDENTIFIER_TRANSPARENT_ALIAS (id))
id = TREE_CHAIN (id);
name = IDENTIFIER_POINTER (id);
type = visibility_types[vis];
fprintf (asm_out_file, "\t.%s\t", type);
assemble_name (asm_out_file, name);
fprintf (asm_out_file, "\n");
#else
if (!DECL_ARTIFICIAL (decl))
warning (OPT_Wattributes, "visibility attribute not supported "
"in this configuration; ignored");
#endif
}
/* Group section information entry stored in solaris_comdat_htab. */
typedef struct comdat_entry
{
const char *name;
unsigned int flags;
tree decl;
const char *sig;
} comdat_entry;
/* Helpers for maintaining solaris_comdat_htab. */
struct comdat_entry_hasher : typed_noop_remove <comdat_entry>
{
typedef comdat_entry value_type;
typedef comdat_entry compare_type;
static inline hashval_t hash (const value_type *);
static inline bool equal (const value_type *, const compare_type *);
static inline void remove (value_type *);
};
inline hashval_t
comdat_entry_hasher::hash (const value_type *entry)
{
return htab_hash_string (entry->sig);
}
inline bool
comdat_entry_hasher::equal (const value_type *entry1,
const compare_type *entry2)
{
return strcmp (entry1->sig, entry2->sig) == 0;
}
/* Hash table of group signature symbols. */
static hash_table<comdat_entry_hasher> *solaris_comdat_htab;
/* Output assembly to switch to COMDAT group section NAME with attributes
FLAGS and group signature symbol DECL, using Sun as syntax. */
void
solaris_elf_asm_comdat_section (const char *name, unsigned int flags, tree decl)
{
const char *signature;
char *section;
comdat_entry entry, **slot;
if (TREE_CODE (decl) == IDENTIFIER_NODE)
signature = IDENTIFIER_POINTER (decl);
else
signature = IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl));
/* Sun as requires group sections to be fragmented, i.e. to have names of
the form <section>%<fragment>. Strictly speaking this is only
necessary to support cc -xF, but is enforced globally in violation of
the ELF gABI. We keep the section names generated by GCC (generally
of the form .text.<signature>) and append %<signature> to pacify as,
despite the redundancy. */
section = concat (name, "%", signature, NULL);
/* Clear SECTION_LINKONCE flag so targetm.asm_out.named_section only
emits this as a regular section. Emit section before .group
directive since Sun as treats undeclared sections as @progbits,
which conflicts with .bss* sections which are @nobits. */
targetm.asm_out.named_section (section, flags & ~SECTION_LINKONCE, decl);
/* Sun as separates declaration of a group section and of the group
itself, using the .group directive and the #comdat flag. */
fprintf (asm_out_file, "\t.group\t%s," SECTION_NAME_FORMAT ",#comdat\n",
signature, section);
/* Unlike GNU as, group signature symbols need to be defined explicitly
for Sun as. With a few exceptions, this is already the case. To
identify the missing ones without changing the affected frontents,
remember the signature symbols and emit those not marked
TREE_SYMBOL_REFERENCED in solaris_file_end. */
if (!solaris_comdat_htab)
solaris_comdat_htab = new hash_table<comdat_entry_hasher> (37);
entry.sig = signature;
slot = solaris_comdat_htab->find_slot (&entry, INSERT);
if (*slot == NULL)
{
*slot = XCNEW (comdat_entry);
/* Remember fragmented section name. */
(*slot)->name = section;
/* Emit as regular section, .group declaration has already been done. */
(*slot)->flags = flags & ~SECTION_LINKONCE;
(*slot)->decl = decl;
(*slot)->sig = signature;
}
}
/* Define unreferenced COMDAT group signature symbol corresponding to SLOT. */
int
solaris_define_comdat_signature (comdat_entry **slot,
void *aux ATTRIBUTE_UNUSED)
{
comdat_entry *entry = *slot;
tree decl = entry->decl;
if (TREE_CODE (decl) != IDENTIFIER_NODE)
decl = DECL_COMDAT_GROUP (decl);
if (!TREE_SYMBOL_REFERENCED (decl))
{
/* Switch to group section, otherwise Sun as complains
`Group Id symbol defined outside of group'. */
switch_to_section (get_section (entry->name, entry->flags, entry->decl));
ASM_OUTPUT_LABEL (asm_out_file, entry->sig);
}
/* Continue with scan. */
return 1;
}
/* Emit unreferenced COMDAT group signature symbols for Sun as. */
void
solaris_file_end (void)
{
if (!solaris_comdat_htab)
return;
solaris_comdat_htab->traverse <void *, solaris_define_comdat_signature>
(NULL);
}
void
solaris_override_options (void)
{
/* Older versions of Solaris ld cannot handle CIE version 3 in .eh_frame.
Don't emit DWARF3/4 unless specifically selected if so. */
if (!HAVE_LD_EH_FRAME_CIEV3 && !global_options_set.x_dwarf_version)
dwarf_version = 2;
}