1/* Routines for C compiler part of GCC for a Symbian OS targeted SH backend. 2 Copyright (C) 2004, 2005, 2007, 2009 Free Software Foundation, Inc. 3 Contributed by RedHat. 4 Most of this code is stolen from i386/winnt.c. 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it 9 under the terms of the GNU General Public License as published 10 by the Free Software Foundation; either version 3, or (at your 11 option) any later version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 16 License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 21 22#include "config.h" 23#include "system.h" 24#include "coretypes.h" 25#include "tm.h" 26#include "rtl.h" 27#include "output.h" 28#include "flags.h" 29#include "tree.h" 30#include "expr.h" 31#include "tm_p.h" 32#include "toplev.h" 33#include "sh-symbian.h" 34 35 36/* Return the type that we should use to determine if DECL is 37 imported or exported. */ 38 39tree 40sh_symbian_associated_type (tree decl) 41{ 42 tree t = NULL_TREE; 43 44 /* We can just take the DECL_CONTEXT as normal. */ 45 if (DECL_CONTEXT (decl) && TYPE_P (DECL_CONTEXT (decl))) 46 t = DECL_CONTEXT (decl); 47 48 return t; 49} 50 51/* Return nonzero if DECL is a dllimport'd object. */ 52 53bool 54sh_symbian_is_dllimported (tree decl) 55{ 56 tree imp; 57 58 if ( TREE_CODE (decl) != VAR_DECL 59 && TREE_CODE (decl) != FUNCTION_DECL) 60 return false; 61 62 imp = lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl)); 63 if (imp) 64 return true; 65 66 /* Class members get the dllimport status of their class. */ 67 imp = sh_symbian_associated_type (decl); 68 if (! imp) 69 return false; 70 71 imp = lookup_attribute ("dllimport", TYPE_ATTRIBUTES (imp)); 72 if (!imp) 73 return false; 74 75 /* Don't mark defined functions as dllimport. If the definition itself 76 was marked with dllimport, then sh_symbian_handle_dll_attribute reports 77 an error. This handles the case when the definition overrides an 78 earlier declaration. */ 79 if (TREE_CODE (decl) == FUNCTION_DECL 80 && DECL_INITIAL (decl) 81 && ! DECL_DECLARED_INLINE_P (decl)) 82 { 83 warning (OPT_Wattributes, "function %q+D is defined after prior " 84 "declaration as dllimport: attribute ignored", 85 decl); 86 return false; 87 } 88 89 /* Don't allow definitions of static data members in dllimport 90 class. Just ignore the attribute for vtable data. */ 91 else if (TREE_CODE (decl) == VAR_DECL 92 && TREE_STATIC (decl) 93 && TREE_PUBLIC (decl) 94 && !DECL_EXTERNAL (decl)) 95 { 96 error ("definition of static data member %q+D of dllimport'd class", 97 decl); 98 return false; 99 } 100 101 return true; 102} 103 104/* Handle a "dllimport" or "dllexport" attribute; 105 arguments as in struct attribute_spec.handler. */ 106 107tree 108sh_symbian_handle_dll_attribute (tree *pnode, tree name, tree args, 109 int flags, bool *no_add_attrs) 110{ 111 tree node = *pnode; 112 const char *attr = IDENTIFIER_POINTER (name); 113 114 /* These attributes may apply to structure and union types being 115 created, but otherwise should pass to the declaration involved. */ 116 if (!DECL_P (node)) 117 { 118 if (flags & ((int) ATTR_FLAG_DECL_NEXT 119 | (int) ATTR_FLAG_FUNCTION_NEXT 120 | (int) ATTR_FLAG_ARRAY_NEXT)) 121 { 122 warning (OPT_Wattributes, "%qs attribute ignored", attr); 123 *no_add_attrs = true; 124 return tree_cons (name, args, NULL_TREE); 125 } 126 127 if (TREE_CODE (node) != RECORD_TYPE && TREE_CODE (node) != UNION_TYPE) 128 { 129 warning (OPT_Wattributes, "%qs attribute ignored", attr); 130 *no_add_attrs = true; 131 } 132 133 return NULL_TREE; 134 } 135 136 /* Report error on dllimport ambiguities 137 seen now before they cause any damage. */ 138 else if (is_attribute_p ("dllimport", name)) 139 { 140 if (TREE_CODE (node) == VAR_DECL) 141 { 142 if (DECL_INITIAL (node)) 143 { 144 error ("variable %q+D definition is marked dllimport", 145 node); 146 *no_add_attrs = true; 147 } 148 149 /* `extern' needn't be specified with dllimport. 150 Specify `extern' now and hope for the best. Sigh. */ 151 DECL_EXTERNAL (node) = 1; 152 /* Also, implicitly give dllimport'd variables declared within 153 a function global scope, unless declared static. */ 154 if (current_function_decl != NULL_TREE && ! TREE_STATIC (node)) 155 TREE_PUBLIC (node) = 1; 156 } 157 } 158 159 /* Report error if symbol is not accessible at global scope. */ 160 if (!TREE_PUBLIC (node) 161 && ( TREE_CODE (node) == VAR_DECL 162 || TREE_CODE (node) == FUNCTION_DECL)) 163 { 164 error ("external linkage required for symbol %q+D because of %qE attribute", 165 node, name); 166 *no_add_attrs = true; 167 } 168 169#if SYMBIAN_DEBUG 170 print_node_brief (stderr, "mark node", node, 0); 171 fprintf (stderr, " as %s\n", attr); 172#endif 173 174 return NULL_TREE; 175} 176 177int 178sh_symbian_import_export_class (tree ctype ATTRIBUTE_UNUSED, int import_export) 179{ 180 return import_export; 181} 182