gcc/config/sol2.c

   1 /* General Solaris system support.
   2    Copyright (C) 2004, 2005 , 2007, 2010 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 "tree.h"
  25 #include "output.h"
  26 #include "tm.h"
  27 #include "rtl.h"
  28 #include "tm_p.h"
  29 #include "diagnostic-core.h"
  30 #include "ggc.h"
  31
  32 tree solaris_pending_aligns, solaris_pending_inits, solaris_pending_finis;
  33
  34 /* Attach any pending attributes for DECL to the list in *ATTRIBUTES.
  35    Pending attributes come from #pragma or _Pragma, so this code is
  36    only useful in the C family front ends, but it is included in
  37    all languages to avoid changing the target machine initializer
  38    depending on the language.  */
  39
  40 void
  41 solaris_insert_attributes (tree decl, tree *attributes)
  42 {
  43   tree *x, next;
  44
  45   if (solaris_pending_aligns != NULL && TREE_CODE (decl) == VAR_DECL)
  46     for (x = &solaris_pending_aligns; *x; x = &TREE_CHAIN (*x))
  47       {
  48         tree name = TREE_PURPOSE (*x);
  49         tree value = TREE_VALUE (*x);
  50         if (DECL_NAME (decl) == name)
  51           {
  52             if (lookup_attribute ("aligned", DECL_ATTRIBUTES (decl))
  53                 || lookup_attribute ("aligned", *attributes))
  54               warning (0, "ignoring %<#pragma align%> for explicitly "
  55                        "aligned %q+D", decl);
  56             else
  57               *attributes = tree_cons (get_identifier ("aligned"), value,
  58                                        *attributes);
  59             next = TREE_CHAIN (*x);
  60             ggc_free (*x);
  61             *x = next;
  62             break;
  63           }
  64       }
  65
  66   if (solaris_pending_inits != NULL && TREE_CODE (decl) == FUNCTION_DECL)
  67     for (x = &solaris_pending_inits; *x; x = &TREE_CHAIN (*x))
  68       {
  69         tree name = TREE_PURPOSE (*x);
  70         if (DECL_NAME (decl) == name)
  71           {
  72             *attributes = tree_cons (get_identifier ("init"), NULL,
  73                                      *attributes);
  74             TREE_USED (decl) = 1;
  75             DECL_PRESERVE_P (decl) = 1;
  76             next = TREE_CHAIN (*x);
  77             ggc_free (*x);
  78             *x = next;
  79             break;
  80           }
  81       }
  82
  83   if (solaris_pending_finis != NULL && TREE_CODE (decl) == FUNCTION_DECL)
  84     for (x = &solaris_pending_finis; *x; x = &TREE_CHAIN (*x))
  85       {
  86         tree name = TREE_PURPOSE (*x);
  87         if (DECL_NAME (decl) == name)
  88           {
  89             *attributes = tree_cons (get_identifier ("fini"), NULL,
  90                                      *attributes);
  91             TREE_USED (decl) = 1;
  92             DECL_PRESERVE_P (decl) = 1;
  93             next = TREE_CHAIN (*x);
  94             ggc_free (*x);
  95             *x = next;
  96             break;
  97           }
  98       }
  99 }
 100
 101 /* Output initializer or finalizer entries for DECL to FILE.  */
 102
 103 void
 104 solaris_output_init_fini (FILE *file, tree decl)
 105 {
 106   if (lookup_attribute ("init", DECL_ATTRIBUTES (decl)))
 107     {
 108       fprintf (file, PUSHSECTION_FORMAT, ".init");
 109       ASM_OUTPUT_CALL (file, decl);
 110       fprintf (file, "\t.popsection\n");
 111     }
 112
 113   if (lookup_attribute ("fini", DECL_ATTRIBUTES (decl)))
 114     {
 115       fprintf (file, PUSHSECTION_FORMAT, ".fini");
 116       ASM_OUTPUT_CALL (file, decl);
 117       fprintf (file, "\t.popsection\n");
 118     }
 119 }
 120
 121 /* Emit an assembler directive to set symbol for DECL visibility to
 122    the visibility type VIS, which must not be VISIBILITY_DEFAULT.  */
 123
 124 void
 125 solaris_assemble_visibility (tree decl ATTRIBUTE_UNUSED,
 126                              int vis ATTRIBUTE_UNUSED)
 127 {
 128 #ifdef HAVE_GAS_HIDDEN
 129   /* Sun as uses .symbolic for STV_PROTECTED.  STV_INTERNAL is marked as
 130      `currently reserved', but the linker treats it like STV_HIDDEN.  Sun
 131      Studio 12.1 cc emits .hidden instead.
 132
 133      There are 3 Sun extensions GCC doesn't yet know about: STV_EXPORTED,
 134      STV_SINGLETON, and STV_ELIMINATE.
 135
 136      See Linker and Libraries Guide, Ch. 2, Link-Editor, Defining
 137      Additional Symbols with a mapfile,
 138      http://docs.sun.com/app/docs/doc/819-0690/gdzmc?a=view
 139      and Ch. 7, Object-File Format, Symbol Table Section,
 140      http://docs.sun.com/app/docs/doc/819-0690/chapter6-79797?a=view  */
 141
 142   static const char * const visibility_types[] = {
 143     NULL, "symbolic", "hidden", "hidden"
 144   };
 145
 146   const char *name, *type;
 147
 148   name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
 149   type = visibility_types[vis];
 150
 151   fprintf (asm_out_file, "\t.%s\t", type);
 152   assemble_name (asm_out_file, name);
 153   fprintf (asm_out_file, "\n");
 154 #else
 155   warning (OPT_Wattributes, "visibility attribute not supported "
 156            "in this configuration; ignored");
 157 #endif
 158 }