2005-07-02 Zack Weinberg <zack@codesourcery.com>
[official-gcc.git] / gcc / config / arm / pe.c
blobf2f67d5a96f361971e1a334657019f6df0b9ed2d
1 /* Routines for GCC for ARM/pe.
2 Copyright (C) 1995, 1996, 2000, 2001, 2002, 2004, 2005
3 Free Software Foundation, Inc.
4 Contributed by Doug Evans (dje@cygnus.com).
6 This file is part of GCC.
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 2, or (at your
11 option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
23 #include "config.h"
24 #include "system.h"
25 #include "coretypes.h"
26 #include "tm.h"
27 #include "rtl.h"
28 #include "output.h"
29 #include "flags.h"
30 #include "tree.h"
31 #include "expr.h"
32 #include "toplev.h"
33 #include "tm_p.h"
35 extern int current_function_anonymous_args;
38 /* Return nonzero if DECL is a dllexport'd object. */
40 tree current_class_type; /* FIXME */
42 int
43 arm_dllexport_p (decl)
44 tree decl;
46 tree exp;
48 if (TREE_CODE (decl) != VAR_DECL
49 && TREE_CODE (decl) != FUNCTION_DECL)
50 return 0;
51 exp = lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl));
52 if (exp)
53 return 1;
55 return 0;
58 /* Return nonzero if DECL is a dllimport'd object. */
60 int
61 arm_dllimport_p (decl)
62 tree decl;
64 tree imp;
66 if (TREE_CODE (decl) == FUNCTION_DECL
67 && TARGET_NOP_FUN_DLLIMPORT)
68 return 0;
70 if (TREE_CODE (decl) != VAR_DECL
71 && TREE_CODE (decl) != FUNCTION_DECL)
72 return 0;
73 imp = lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl));
74 if (imp)
75 return 1;
77 return 0;
80 /* Return nonzero if SYMBOL is marked as being dllexport'd. */
82 int
83 arm_dllexport_name_p (symbol)
84 const char * symbol;
86 return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'e' && symbol[2] == '.';
89 /* Return nonzero if SYMBOL is marked as being dllimport'd. */
91 int
92 arm_dllimport_name_p (symbol)
93 const char * symbol;
95 return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'i' && symbol[2] == '.';
98 /* Mark a DECL as being dllexport'd.
99 Note that we override the previous setting (e.g.: dllimport). */
101 void
102 arm_mark_dllexport (decl)
103 tree decl;
105 const char * oldname;
106 char * newname;
107 rtx rtlname;
108 tree idp;
110 rtlname = XEXP (DECL_RTL (decl), 0);
111 if (GET_CODE (rtlname) == MEM)
112 rtlname = XEXP (rtlname, 0);
113 gcc_assert (GET_CODE (rtlname) == SYMBOL_REF);
114 oldname = XSTR (rtlname, 0);
116 if (arm_dllimport_name_p (oldname))
117 oldname += 9;
118 else if (arm_dllexport_name_p (oldname))
119 return; /* already done */
121 newname = alloca (strlen (oldname) + 4);
122 sprintf (newname, "%ce.%s", ARM_PE_FLAG_CHAR, oldname);
124 /* We pass newname through get_identifier to ensure it has a unique
125 address. RTL processing can sometimes peek inside the symbol ref
126 and compare the string's addresses to see if two symbols are
127 identical. */
128 /* ??? At least I think that's why we do this. */
129 idp = get_identifier (newname);
131 XEXP (DECL_RTL (decl), 0) =
132 gen_rtx_SYMBOL_REF (Pmode, IDENTIFIER_POINTER (idp));
135 /* Mark a DECL as being dllimport'd. */
137 void
138 arm_mark_dllimport (decl)
139 tree decl;
141 const char * oldname;
142 char * newname;
143 tree idp;
144 rtx rtlname, newrtl;
146 rtlname = XEXP (DECL_RTL (decl), 0);
148 if (GET_CODE (rtlname) == MEM)
149 rtlname = XEXP (rtlname, 0);
150 gcc_assert (GET_CODE (rtlname) == SYMBOL_REF);
151 oldname = XSTR (rtlname, 0);
153 gcc_assert (!arm_dllexport_name_p (oldname));
154 if (arm_dllimport_name_p (oldname))
155 return; /* already done */
157 /* ??? One can well ask why we're making these checks here,
158 and that would be a good question. */
160 /* Imported variables can't be initialized. */
161 if (TREE_CODE (decl) == VAR_DECL
162 && !DECL_VIRTUAL_P (decl)
163 && DECL_INITIAL (decl))
165 error ("initialized variable %q+D is marked dllimport", decl);
166 return;
168 /* Nor can they be static. */
169 if (TREE_CODE (decl) == VAR_DECL
170 /* ??? Is this test for vtables needed? */
171 && !DECL_VIRTUAL_P (decl)
172 && 0 /*???*/)
174 error ("static variable %q+D is marked dllimport", decl);
175 return;
178 /* `extern' needn't be specified with dllimport.
179 Specify `extern' now and hope for the best. Sigh. */
180 if (TREE_CODE (decl) == VAR_DECL
181 /* ??? Is this test for vtables needed? */
182 && !DECL_VIRTUAL_P (decl))
184 DECL_EXTERNAL (decl) = 1;
185 TREE_PUBLIC (decl) = 1;
188 newname = alloca (strlen (oldname) + 11);
189 sprintf (newname, "%ci.__imp_%s", ARM_PE_FLAG_CHAR, oldname);
191 /* We pass newname through get_identifier to ensure it has a unique
192 address. RTL processing can sometimes peek inside the symbol ref
193 and compare the string's addresses to see if two symbols are
194 identical. */
195 /* ??? At least I think that's why we do this. */
196 idp = get_identifier (newname);
198 newrtl = gen_rtx_MEM (Pmode,
199 gen_rtx_SYMBOL_REF (Pmode,
200 IDENTIFIER_POINTER (idp)));
201 XEXP (DECL_RTL (decl), 0) = newrtl;
204 void
205 arm_pe_encode_section_info (decl, rtl, first)
206 tree decl;
207 rtx rtl;
208 int first ATTRIBUTE_UNUSED;
210 /* This bit is copied from arm_encode_section_info. */
211 if (optimize > 0 && TREE_CONSTANT (decl))
212 SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1;
214 /* Mark the decl so we can tell from the rtl whether the object is
215 dllexport'd or dllimport'd. */
216 if (arm_dllexport_p (decl))
217 arm_mark_dllexport (decl);
218 else if (arm_dllimport_p (decl))
219 arm_mark_dllimport (decl);
220 /* It might be that DECL has already been marked as dllimport, but a
221 subsequent definition nullified that. The attribute is gone but
222 DECL_RTL still has @i.__imp_foo. We need to remove that. */
223 else if ((TREE_CODE (decl) == FUNCTION_DECL
224 || TREE_CODE (decl) == VAR_DECL)
225 && DECL_RTL (decl) != NULL_RTX
226 && GET_CODE (DECL_RTL (decl)) == MEM
227 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM
228 && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == SYMBOL_REF
229 && arm_dllimport_name_p (XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0)))
231 const char *oldname = XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0);
232 tree idp = get_identifier (oldname + 9);
233 rtx newrtl = gen_rtx_SYMBOL_REF (Pmode, IDENTIFIER_POINTER (idp));
235 XEXP (DECL_RTL (decl), 0) = newrtl;
237 /* We previously set TREE_PUBLIC and DECL_EXTERNAL.
238 ??? We leave these alone for now. */
242 void
243 arm_pe_unique_section (decl, reloc)
244 tree decl;
245 int reloc;
247 int len;
248 const char * name;
249 char * string;
250 const char * prefix;
252 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
253 name = arm_strip_name_encoding (name);
255 /* The object is put in, for example, section .text$foo.
256 The linker will then ultimately place them in .text
257 (everything from the $ on is stripped). */
258 if (TREE_CODE (decl) == FUNCTION_DECL)
259 prefix = ".text$";
260 else if (decl_readonly_section (decl, reloc))
261 prefix = ".rdata$";
262 else
263 prefix = ".data$";
264 len = strlen (name) + strlen (prefix);
265 string = alloca (len + 1);
266 sprintf (string, "%s%s", prefix, name);
268 DECL_SECTION_NAME (decl) = build_string (len, string);