re PR c++/16276 ([3.4 only] G++ generates local references to linkonce sections)
[gcc.git] / gcc / config / i386 / cygming.h
1 /* Operating system specific defines to be used when targeting GCC for
2 hosting on Windows32, using a Unix style C library and tools.
3 Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
4 Free Software Foundation, Inc.
5
6 This file is part of GCC.
7
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
11 any later version.
12
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public 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 COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
22
23 #define DBX_DEBUGGING_INFO 1
24 #define SDB_DEBUGGING_INFO 1
25 #undef PREFERRED_DEBUGGING_TYPE
26 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
27
28 #ifdef HAVE_GAS_PE_SECREL32_RELOC
29 #define DWARF2_DEBUGGING_INFO 1
30
31 #undef DBX_REGISTER_NUMBER
32 #define DBX_REGISTER_NUMBER(n) (write_symbols == DWARF2_DEBUG \
33 ? svr4_dbx_register_map[n] \
34 : dbx_register_map[n])
35
36 /* Use section relative relocations for debugging offsets. Unlike
37 other targets that fake this by putting the section VMA at 0, PE
38 won't allow it. */
39 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL) \
40 do { \
41 if (SIZE != 4) \
42 abort (); \
43 \
44 fputs ("\t.secrel32\t", FILE); \
45 assemble_name (FILE, LABEL); \
46 } while (0)
47 #endif
48
49 #define TARGET_EXECUTABLE_SUFFIX ".exe"
50
51 #include <stdio.h>
52
53 /* Masks for subtarget switches used by other files. */
54 #define MASK_NOP_FUN_DLLIMPORT 0x08000000 /* Ignore dllimport for functions */
55
56 /* Used in winnt.c. */
57 #define TARGET_NOP_FUN_DLLIMPORT (target_flags & MASK_NOP_FUN_DLLIMPORT)
58
59 #undef SUBTARGET_SWITCHES
60 #define SUBTARGET_SWITCHES \
61 { "cygwin", 0, N_("Use the Cygwin interface") }, \
62 { "no-cygwin", 0, N_("Use the Mingw32 interface") }, \
63 { "windows", 0, N_("Create GUI application") }, \
64 { "no-win32", 0, N_("Don't set Windows defines") }, \
65 { "win32", 0, N_("Set Windows defines") }, \
66 { "console", 0, N_("Create console application") },\
67 { "dll", 0, N_("Generate code for a DLL") }, \
68 { "nop-fun-dllimport", MASK_NOP_FUN_DLLIMPORT, \
69 N_("Ignore dllimport for functions") }, \
70 { "no-nop-fun-dllimport", -MASK_NOP_FUN_DLLIMPORT, "" }, \
71 { "threads", 0, N_("Use Mingw-specific thread support") },
72
73 #define MAYBE_UWIN_CPP_BUILTINS() /* Nothing. */
74
75 #define TARGET_OS_CPP_BUILTINS() \
76 do \
77 { \
78 builtin_define ("_X86_=1"); \
79 builtin_assert ("system=winnt"); \
80 builtin_define ("__stdcall=__attribute__((__stdcall__))"); \
81 builtin_define ("__fastcall=__attribute__((__fastcall__))"); \
82 builtin_define ("__cdecl=__attribute__((__cdecl__))"); \
83 if (!flag_iso) \
84 { \
85 builtin_define ("_stdcall=__attribute__((__stdcall__))"); \
86 builtin_define ("_fastcall=__attribute__((__fastcall__))"); \
87 builtin_define ("_cdecl=__attribute__((__cdecl__))"); \
88 } \
89 MAYBE_UWIN_CPP_BUILTINS (); \
90 EXTRA_OS_CPP_BUILTINS (); \
91 } \
92 while (0)
93
94 /* Get tree.c to declare a target-specific specialization of
95 merge_decl_attributes. */
96 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
97
98 /* This macro defines names of additional specifications to put in the specs
99 that can be used in various specifications like CC1_SPEC. Its definition
100 is an initializer with a subgrouping for each command option.
101
102 Each subgrouping contains a string constant, that defines the
103 specification name, and a string constant that used by the GCC driver
104 program.
105
106 Do not define this macro if it does not need to do anything. */
107
108 #undef SUBTARGET_EXTRA_SPECS
109 #define SUBTARGET_EXTRA_SPECS \
110 { "mingw_include_path", DEFAULT_TARGET_MACHINE }
111
112 #undef MATH_LIBRARY
113 #define MATH_LIBRARY ""
114
115 #define SIZE_TYPE "unsigned int"
116 #define PTRDIFF_TYPE "int"
117 #define WCHAR_TYPE_SIZE 16
118 #define WCHAR_TYPE "short unsigned int"
119
120 \f
121 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop). */
122 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
123
124 union tree_node;
125 #define TREE union tree_node *
126 \f
127 #undef EXTRA_SECTIONS
128 #define EXTRA_SECTIONS in_drectve
129
130 #undef EXTRA_SECTION_FUNCTIONS
131 #define EXTRA_SECTION_FUNCTIONS \
132 DRECTVE_SECTION_FUNCTION \
133 SWITCH_TO_SECTION_FUNCTION
134
135 #define DRECTVE_SECTION_FUNCTION \
136 void \
137 drectve_section (void) \
138 { \
139 if (in_section != in_drectve) \
140 { \
141 fprintf (asm_out_file, "%s\n", "\t.section .drectve\n"); \
142 in_section = in_drectve; \
143 } \
144 }
145 void drectve_section (void);
146
147 /* Older versions of gas don't handle 'r' as data.
148 Explicitly set data flag with 'd'. */
149 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\""
150
151 /* Switch to SECTION (an `enum in_section').
152
153 ??? This facility should be provided by GCC proper.
154 The problem is that we want to temporarily switch sections in
155 ASM_DECLARE_OBJECT_NAME and then switch back to the original section
156 afterwards. */
157 #define SWITCH_TO_SECTION_FUNCTION \
158 void switch_to_section (enum in_section, tree); \
159 void \
160 switch_to_section (enum in_section section, tree decl) \
161 { \
162 switch (section) \
163 { \
164 case in_text: text_section (); break; \
165 case in_data: data_section (); break; \
166 case in_readonly_data: readonly_data_section (); break; \
167 case in_named: named_section (decl, NULL, 0); break; \
168 case in_drectve: drectve_section (); break; \
169 default: abort (); break; \
170 } \
171 }
172
173 /* Don't allow flag_pic to propagate since gas may produce invalid code
174 otherwise. */
175
176 #undef SUBTARGET_OVERRIDE_OPTIONS
177 #define SUBTARGET_OVERRIDE_OPTIONS \
178 do { \
179 if (flag_pic) \
180 { \
181 warning ("-f%s ignored for target (all code is position independent)",\
182 (flag_pic > 1) ? "PIC" : "pic"); \
183 flag_pic = 0; \
184 } \
185 } while (0) \
186
187 /* Define this macro if references to a symbol must be treated
188 differently depending on something about the variable or
189 function named by the symbol (such as what section it is in).
190
191 On i386 running Windows NT, modify the assembler name with a suffix
192 consisting of an atsign (@) followed by string of digits that represents
193 the number of bytes of arguments passed to the function, if it has the
194 attribute STDCALL.
195
196 In addition, we must mark dll symbols specially. Definitions of
197 dllexport'd objects install some info in the .drectve section.
198 References to dllimport'd objects are fetched indirectly via
199 _imp__. If both are declared, dllexport overrides. This is also
200 needed to implement one-only vtables: they go into their own
201 section and we need to set DECL_SECTION_NAME so we do that here.
202 Note that we can be called twice on the same decl. */
203
204 #undef TARGET_ENCODE_SECTION_INFO
205 #define TARGET_ENCODE_SECTION_INFO i386_pe_encode_section_info
206 #undef TARGET_STRIP_NAME_ENCODING
207 #define TARGET_STRIP_NAME_ENCODING i386_pe_strip_name_encoding_full
208 \f
209 /* Output a reference to a label. */
210 #undef ASM_OUTPUT_LABELREF
211 #define ASM_OUTPUT_LABELREF i386_pe_output_labelref
212
213 /* Output a common block. */
214 #undef ASM_OUTPUT_COMMON
215 #define ASM_OUTPUT_COMMON(STREAM, NAME, SIZE, ROUNDED) \
216 do { \
217 if (i386_pe_dllexport_name_p (NAME)) \
218 i386_pe_record_exported_symbol (NAME, 1); \
219 if (! i386_pe_dllimport_name_p (NAME)) \
220 { \
221 fprintf ((STREAM), "\t.comm\t"); \
222 assemble_name ((STREAM), (NAME)); \
223 fprintf ((STREAM), ", %d\t%s %d\n", \
224 (int)(ROUNDED), ASM_COMMENT_START, (int)(SIZE)); \
225 } \
226 } while (0)
227
228 /* Output the label for an initialized variable. */
229 #undef ASM_DECLARE_OBJECT_NAME
230 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL) \
231 do { \
232 if (i386_pe_dllexport_name_p (NAME)) \
233 i386_pe_record_exported_symbol (NAME, 1); \
234 ASM_OUTPUT_LABEL ((STREAM), (NAME)); \
235 } while (0)
236
237 \f
238 /* Emit code to check the stack when allocating more that 4000
239 bytes in one go. */
240
241 #define CHECK_STACK_LIMIT 4000
242
243 /* By default, target has a 80387, uses IEEE compatible arithmetic,
244 returns float values in the 387 and needs stack probes.
245 We also align doubles to 64-bits for MSVC default compatibility. */
246
247 #undef TARGET_SUBTARGET_DEFAULT
248 #define TARGET_SUBTARGET_DEFAULT \
249 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_STACK_PROBE \
250 | MASK_ALIGN_DOUBLE)
251
252 /* This is how to output an assembler line
253 that says to advance the location counter
254 to a multiple of 2**LOG bytes. */
255
256 #undef ASM_OUTPUT_ALIGN
257 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
258 if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
259
260 /* Define this macro if in some cases global symbols from one translation
261 unit may not be bound to undefined symbols in another translation unit
262 without user intervention. For instance, under Microsoft Windows
263 symbols must be explicitly imported from shared libraries (DLLs). */
264 #define MULTIPLE_SYMBOL_SPACES
265
266 extern void i386_pe_unique_section (TREE, int);
267 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
268 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
269
270 #define SUPPORTS_ONE_ONLY 1
271
272 /* Switch into a generic section. */
273 #define TARGET_ASM_NAMED_SECTION i386_pe_asm_named_section
274
275 /* Select attributes for named sections. */
276 #define TARGET_SECTION_TYPE_FLAGS i386_pe_section_type_flags
277
278 /* Write the extra assembler code needed to declare a function
279 properly. If we are generating SDB debugging information, this
280 will happen automatically, so we only need to handle other cases. */
281 #undef ASM_DECLARE_FUNCTION_NAME
282 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
283 do \
284 { \
285 if (i386_pe_dllexport_name_p (NAME)) \
286 i386_pe_record_exported_symbol (NAME, 0); \
287 if (write_symbols != SDB_DEBUG) \
288 i386_pe_declare_function_type (FILE, NAME, TREE_PUBLIC (DECL)); \
289 ASM_OUTPUT_LABEL (FILE, NAME); \
290 } \
291 while (0)
292
293 /* Add an external function to the list of functions to be declared at
294 the end of the file. */
295 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
296 do \
297 { \
298 if (TREE_CODE (DECL) == FUNCTION_DECL) \
299 i386_pe_record_external_function (NAME); \
300 } \
301 while (0)
302
303 /* Declare the type properly for any external libcall. */
304 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
305 i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
306
307 /* This says out to put a global symbol in the BSS section. */
308 #undef ASM_OUTPUT_ALIGNED_BSS
309 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
310 asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
311
312 /* Output function declarations at the end of the file. */
313 #undef TARGET_ASM_FILE_END
314 #define TARGET_ASM_FILE_END i386_pe_file_end
315
316 #undef ASM_COMMENT_START
317 #define ASM_COMMENT_START " #"
318
319 /* DWARF2 Unwinding doesn't work with exception handling yet. To make
320 it work, we need to build a libgcc_s.dll, and dcrt0.o should be
321 changed to call __register_frame_info/__deregister_frame_info. */
322 #define DWARF2_UNWIND_INFO 0
323
324 /* Don't assume anything about the header files. */
325 #define NO_IMPLICIT_EXTERN_C
326
327 #undef PROFILE_HOOK
328 #define PROFILE_HOOK(LABEL) \
329 if (MAIN_NAME_P (DECL_NAME (current_function_decl))) \
330 { \
331 emit_call_insn (gen_rtx_CALL (VOIDmode, \
332 gen_rtx_MEM (FUNCTION_MODE, \
333 gen_rtx_SYMBOL_REF (Pmode, "_monstartup")), \
334 const0_rtx)); \
335 }
336
337 /* Java Native Interface (JNI) methods on Win32 are invoked using the
338 stdcall calling convention. */
339 #undef MODIFY_JNI_METHOD_CALL
340 #define MODIFY_JNI_METHOD_CALL(MDECL) \
341 build_type_attribute_variant ((MDECL), \
342 build_tree_list (get_identifier ("stdcall"), \
343 NULL))
344
345 /* External function declarations. */
346
347 extern void i386_pe_record_external_function (const char *);
348 extern void i386_pe_declare_function_type (FILE *, const char *, int);
349 extern void i386_pe_record_exported_symbol (const char *, int);
350 extern void i386_pe_file_end (void);
351 extern int i386_pe_dllexport_name_p (const char *);
352 extern int i386_pe_dllimport_name_p (const char *);
353
354 /* For Win32 ABI compatibility */
355 #undef DEFAULT_PCC_STRUCT_RETURN
356 #define DEFAULT_PCC_STRUCT_RETURN 0
357
358 /* MSVC returns aggregate types of up to 8 bytes via registers.
359 See i386.c:ix86_return_in_memory. */
360 #undef MS_AGGREGATE_RETURN
361 #define MS_AGGREGATE_RETURN 1
362
363 /* No data type wants to be aligned rounder than this. */
364 #undef BIGGEST_ALIGNMENT
365 #define BIGGEST_ALIGNMENT 128
366
367 /* Native complier aligns internal doubles in structures on dword boundaries. */
368 #undef BIGGEST_FIELD_ALIGNMENT
369 #define BIGGEST_FIELD_ALIGNMENT 64
370
371 /* A bit-field declared as `int' forces `int' alignment for the struct. */
372 #undef PCC_BITFIELD_TYPE_MATTERS
373 #define PCC_BITFIELD_TYPE_MATTERS 1
374 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
375
376 /* Enable alias attribute support. */
377 #ifndef SET_ASM_OP
378 #define SET_ASM_OP "\t.set\t"
379 #endif
380 /* This implements the `alias' attribute, keeping any stdcall or
381 fastcall decoration. */
382 #undef ASM_OUTPUT_DEF_FROM_DECLS
383 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET) \
384 do \
385 { \
386 const char *alias; \
387 rtx rtlname = XEXP (DECL_RTL (DECL), 0); \
388 if (GET_CODE (rtlname) == SYMBOL_REF) \
389 alias = XSTR (rtlname, 0); \
390 else \
391 abort (); \
392 if (TREE_CODE (DECL) == FUNCTION_DECL) \
393 i386_pe_declare_function_type (STREAM, alias, \
394 TREE_PUBLIC (DECL)); \
395 ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET)); \
396 } while (0)
397
398 /* Decide whether it is safe to use a local alias for a virtual function
399 when constructing thunks. */
400 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P
401 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL))
402
403 #undef TREE
404
405 #ifndef BUFSIZ
406 # undef FILE
407 #endif