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/* General Solaris system support.

   Copyright (C) 2004, 2005 , 2007, 2010, 2011 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 "tree.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 "hashtab.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 ATTRIBUTE_UNUSED,

                             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;

  name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));

  type = visibility_types[vis];

  fprintf (asm_out_file, "\t.%s\t", type);

  assemble_name (asm_out_file, name);

  fprintf (asm_out_file, "\n");

#else

  warning (OPT_Wattributes, "visibility attribute not supported "

           "in this configuration; ignored");

#endif

}

/* Hash table of group signature symbols.  */

static htab_t solaris_comdat_htab;

/* 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;

/* Helper routines for maintaining solaris_comdat_htab.  */

static hashval_t

comdat_hash (const void *p)

{

  const comdat_entry *entry = (const comdat_entry *) p;

  return htab_hash_string (entry->sig);

}

static int

comdat_eq (const void *p1, const void *p2)

{

  const comdat_entry *entry1 = (const comdat_entry *) p1;

  const comdat_entry *entry2 = (const comdat_entry *) p2;

  return strcmp (entry1->sig, entry2->sig) == 0;

}

/* 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 == NULL)

    solaris_comdat_htab = htab_create_alloc (37, comdat_hash, comdat_eq, NULL,

                                             xcalloc, free);

  entry.sig = signature;

  slot = (comdat_entry **) htab_find_slot (solaris_comdat_htab, &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.  */

static int

solaris_define_comdat_signature (void **slot, void *aux ATTRIBUTE_UNUSED)

{

  comdat_entry *entry = *(comdat_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 == NULL)

    return;

  htab_traverse (solaris_comdat_htab, solaris_define_comdat_signature, NULL);

}