1/* Routines for GCC for ARM/pe.
2 Copyright (C) 1995, 1996, 2000, 2001 Free Software Foundation, Inc.
3 Contributed by Doug Evans (dje@cygnus.com).
4
5This file is part of GNU CC.
6
7GNU CC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU CC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU CC; see the file COPYING. If not, write to
19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA. */
21
22#include "config.h"
23#include "system.h"
24#include "rtl.h"
25#include "output.h"
26#include "flags.h"
27#include "tree.h"
28#include "expr.h"
29#include "toplev.h"
30#include "tm_p.h"
31
32extern int current_function_anonymous_args;
33
34
35/* Return non-zero if DECL is a dllexport'd object. */
36
37tree current_class_type; /* FIXME */
38
39int
40arm_dllexport_p (decl)
41 tree decl;
42{
43 tree exp;
44
45 if (TREE_CODE (decl) != VAR_DECL
46 && TREE_CODE (decl) != FUNCTION_DECL)
47 return 0;
48 exp = lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl));
49 if (exp)
50 return 1;
51
52 return 0;
53}
54
55/* Return non-zero if DECL is a dllimport'd object. */
56
57int
58arm_dllimport_p (decl)
59 tree decl;
60{
61 tree imp;
62
63 if (TREE_CODE (decl) == FUNCTION_DECL
64 && TARGET_NOP_FUN_DLLIMPORT)
65 return 0;
66
67 if (TREE_CODE (decl) != VAR_DECL
68 && TREE_CODE (decl) != FUNCTION_DECL)
69 return 0;
70 imp = lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl));
71 if (imp)
72 return 1;
73
74 return 0;
75}
76
77/* Return non-zero if SYMBOL is marked as being dllexport'd. */
78
79int
80arm_dllexport_name_p (symbol)
81 const char * symbol;
82{
83 return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'e' && symbol[2] == '.';
84}
85
86/* Return non-zero if SYMBOL is marked as being dllimport'd. */
87
88int
89arm_dllimport_name_p (symbol)
90 const char * symbol;
91{
92 return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'i' && symbol[2] == '.';
93}
94
95/* Mark a DECL as being dllexport'd.
96 Note that we override the previous setting (eg: dllimport). */
97
98void
99arm_mark_dllexport (decl)
100 tree decl;
101{
102 const char * oldname;
103 char * newname;
104 rtx rtlname;
105 tree idp;
106
107 rtlname = XEXP (DECL_RTL (decl), 0);
108 if (GET_CODE (rtlname) == SYMBOL_REF)
109 oldname = XSTR (rtlname, 0);
110 else if (GET_CODE (rtlname) == MEM
111 && GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF)
112 oldname = XSTR (XEXP (rtlname, 0), 0);
113 else
114 abort ();
115 if (arm_dllimport_name_p (oldname))
116 oldname += 9;
117 else if (arm_dllexport_name_p (oldname))
118 return; /* already done */
119
120 newname = alloca (strlen (oldname) + 4);
121 sprintf (newname, "%ce.%s", ARM_PE_FLAG_CHAR, oldname);
122
123 /* We pass newname through get_identifier to ensure it has a unique
124 address. RTL processing can sometimes peek inside the symbol ref
125 and compare the string's addresses to see if two symbols are
126 identical. */
127 /* ??? At least I think that's why we do this. */
128 idp = get_identifier (newname);
129
130 XEXP (DECL_RTL (decl), 0) =
131 gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp));
132}
133
134/* Mark a DECL as being dllimport'd. */
135
136void
137arm_mark_dllimport (decl)
138 tree decl;
139{
140 const char * oldname;
141 char * newname;
142 tree idp;
143 rtx rtlname, newrtl;
144
145 rtlname = XEXP (DECL_RTL (decl), 0);
146
147 if (GET_CODE (rtlname) == SYMBOL_REF)
148 oldname = XSTR (rtlname, 0);
149 else if (GET_CODE (rtlname) == MEM
150 && GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF)
151 oldname = XSTR (XEXP (rtlname, 0), 0);
152 else
153 abort ();
154
155 if (arm_dllexport_name_p (oldname))
156 abort (); /* this shouldn't happen */
157 else if (arm_dllimport_name_p (oldname))
158 return; /* already done */
159
160 /* ??? One can well ask why we're making these checks here,
161 and that would be a good question. */
162
163 /* Imported variables can't be initialized. */
164 if (TREE_CODE (decl) == VAR_DECL
165 && !DECL_VIRTUAL_P (decl)
166 && DECL_INITIAL (decl))
167 {
168 error_with_decl (decl, "initialized variable `%s' is marked dllimport");
169 return;
170 }
171 /* Nor can they be static. */
172 if (TREE_CODE (decl) == VAR_DECL
173 /* ??? Is this test for vtables needed? */
174 && !DECL_VIRTUAL_P (decl)
175 && 0 /*???*/)
176 {
177 error_with_decl (decl, "static variable `%s' is marked dllimport");
178 return;
179 }
180
181 /* `extern' needn't be specified with dllimport.
182 Specify `extern' now and hope for the best. Sigh. */
183 if (TREE_CODE (decl) == VAR_DECL
184 /* ??? Is this test for vtables needed? */
185 && !DECL_VIRTUAL_P (decl))
186 {
187 DECL_EXTERNAL (decl) = 1;
188 TREE_PUBLIC (decl) = 1;
189 }
190
191 newname = alloca (strlen (oldname) + 11);
192 sprintf (newname, "%ci.__imp_%s", ARM_PE_FLAG_CHAR, oldname);
193
194 /* We pass newname through get_identifier to ensure it has a unique
195 address. RTL processing can sometimes peek inside the symbol ref
196 and compare the string's addresses to see if two symbols are
197 identical. */
198 /* ??? At least I think that's why we do this. */
199 idp = get_identifier (newname);
200
201 newrtl = gen_rtx (MEM, Pmode,
202 gen_rtx (SYMBOL_REF, Pmode,
203 IDENTIFIER_POINTER (idp)));
204 XEXP (DECL_RTL (decl), 0) = newrtl;
205}
206
207/* Cover function to implement ENCODE_SECTION_INFO. */
208
209void
210arm_pe_encode_section_info (decl)
211 tree decl;
212{
213 /* This bit is copied from arm.h. */
214 if (optimize > 0 && TREE_CONSTANT (decl)
215 && (!flag_writable_strings || TREE_CODE (decl) != STRING_CST))
216 {
217 rtx rtl = (TREE_CODE_CLASS (TREE_CODE (decl)) != 'd'
218 ? TREE_CST_RTL (decl) : DECL_RTL (decl));
219 SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1;
220 }
221
222 /* Mark the decl so we can tell from the rtl whether the object is
223 dllexport'd or dllimport'd. */
224 if (arm_dllexport_p (decl))
225 arm_mark_dllexport (decl);
226 else if (arm_dllimport_p (decl))
227 arm_mark_dllimport (decl);
228 /* It might be that DECL has already been marked as dllimport, but a
229 subsequent definition nullified that. The attribute is gone but
230 DECL_RTL still has @i.__imp_foo. We need to remove that. */
231 else if ((TREE_CODE (decl) == FUNCTION_DECL
232 || TREE_CODE (decl) == VAR_DECL)
233 && DECL_RTL (decl) != NULL_RTX
234 && GET_CODE (DECL_RTL (decl)) == MEM
235 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM
236 && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == SYMBOL_REF
237 && arm_dllimport_name_p (XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0)))
238 {
239 const char *oldname = XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0);
240 tree idp = get_identifier (oldname + 9);
241 rtx newrtl = gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp));
242
243 XEXP (DECL_RTL (decl), 0) = newrtl;
244
245 /* We previously set TREE_PUBLIC and DECL_EXTERNAL.
246 ??? We leave these alone for now. */
247 }
248}
249
250/* Cover function for UNIQUE_SECTION. */
251
252void
253arm_pe_unique_section (decl, reloc)
254 tree decl;
255 int reloc;
256{
257 int len;
258 const char * name;
259 char * string;
260 const char * prefix;
261
262 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
263 /* Strip off any encoding in fnname. */
264 STRIP_NAME_ENCODING (name, name);
265
266 /* The object is put in, for example, section .text$foo.
267 The linker will then ultimately place them in .text
268 (everything from the $ on is stripped). */
269 if (TREE_CODE (decl) == FUNCTION_DECL)
270 prefix = ".text$";
271 else if (DECL_READONLY_SECTION (decl, reloc))
272 prefix = ".rdata$";
273 else
274 prefix = ".data$";
275 len = strlen (name) + strlen (prefix);
276 string = alloca (len + 1);
277 sprintf (string, "%s%s", prefix, name);
278
279 DECL_SECTION_NAME (decl) = build_string (len, string);
280}