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1 282 jeremybenn
/* Definitions of target machine for GNU compiler, for DEC Alpha w/ELF.
2
   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2007, 2008,
3
   2009, 2010 Free Software Foundation, Inc.
4
   Contributed by Richard Henderson (rth@tamu.edu).
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 3, 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 COPYING3.  If not see
20
<http://www.gnu.org/licenses/>.  */
21
 
22
#undef OBJECT_FORMAT_COFF
23
#undef EXTENDED_COFF
24
#define OBJECT_FORMAT_ELF
25
 
26
/* ??? Move all SDB stuff from alpha.h to osf.h.  */
27
#undef SDB_DEBUGGING_INFO
28
 
29
#define DBX_DEBUGGING_INFO 1
30
#define DWARF2_DEBUGGING_INFO 1
31
 
32
#undef  PREFERRED_DEBUGGING_TYPE
33
#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
34
 
35
#undef ASM_FINAL_SPEC
36
 
37
/* alpha/ doesn't use elfos.h for some reason.  */
38
#define TARGET_OBJFMT_CPP_BUILTINS()            \
39
  do                                            \
40
    {                                           \
41
        builtin_define ("__ELF__");             \
42
    }                                           \
43
  while (0)
44
 
45
#undef  CC1_SPEC
46
#define CC1_SPEC  "%{G*}"
47
 
48
#undef  ASM_SPEC
49
#define ASM_SPEC  "%{G*} %{relax:-relax} %{!gstabs*:-no-mdebug}%{gstabs*:-mdebug}"
50
 
51
#undef  IDENT_ASM_OP
52
#define IDENT_ASM_OP "\t.ident\t"
53
 
54
/* Output #ident as a .ident.  */
55
#undef  ASM_OUTPUT_IDENT
56
#define ASM_OUTPUT_IDENT(FILE, NAME) \
57
  fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
58
 
59
/* This is how to allocate empty space in some section.  The .zero
60
   pseudo-op is used for this on most svr4 assemblers.  */
61
 
62
#undef  SKIP_ASM_OP
63
#define SKIP_ASM_OP     "\t.zero\t"
64
 
65
#undef  ASM_OUTPUT_SKIP
66
#define ASM_OUTPUT_SKIP(FILE, SIZE) \
67
  fprintf (FILE, "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n", SKIP_ASM_OP, (SIZE))
68
 
69
/* Output the label which precedes a jumptable.  Note that for all svr4
70
   systems where we actually generate jumptables (which is to say every
71
   svr4 target except i386, where we use casesi instead) we put the jump-
72
   tables into the .rodata section and since other stuff could have been
73
   put into the .rodata section prior to any given jumptable, we have to
74
   make sure that the location counter for the .rodata section gets pro-
75
   perly re-aligned prior to the actual beginning of the jump table.  */
76
 
77
#undef  ALIGN_ASM_OP
78
#define ALIGN_ASM_OP "\t.align\t"
79
 
80
#ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
81
#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
82
  ASM_OUTPUT_ALIGN ((FILE), 2);
83
#endif
84
 
85
#undef  ASM_OUTPUT_CASE_LABEL
86
#define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE)             \
87
  do {                                                                  \
88
    ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE)         \
89
    (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM);                      \
90
  } while (0)
91
 
92
/* The standard SVR4 assembler seems to require that certain builtin
93
   library routines (e.g. .udiv) be explicitly declared as .globl
94
   in each assembly file where they are referenced.  */
95
 
96
#undef  ASM_OUTPUT_EXTERNAL_LIBCALL
97
#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)                          \
98
  (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0))
99
 
100
/* This says how to output assembler code to declare an
101
   uninitialized external linkage data object.  Under SVR4,
102
   the linker seems to want the alignment of data objects
103
   to depend on their types.  We do exactly that here.  */
104
 
105
#undef  COMMON_ASM_OP
106
#define COMMON_ASM_OP   "\t.comm\t"
107
 
108
#undef  ASM_OUTPUT_ALIGNED_COMMON
109
#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
110
do {                                                                    \
111
  fprintf ((FILE), "%s", COMMON_ASM_OP);                                \
112
  assemble_name ((FILE), (NAME));                                       \
113
  fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED ",%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT);  \
114
} while (0)
115
 
116
/* This says how to output assembler code to declare an
117
   uninitialized internal linkage data object.  Under SVR4,
118
   the linker seems to want the alignment of data objects
119
   to depend on their types.  We do exactly that here.  */
120
 
121
#undef  ASM_OUTPUT_ALIGNED_LOCAL
122
#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)               \
123
do {                                                                    \
124
  if ((SIZE) <= g_switch_value)                                         \
125
    switch_to_section (sbss_section);                                   \
126
  else                                                                  \
127
    switch_to_section (bss_section);                                    \
128
  ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");                     \
129
  if (!flag_inhibit_size_directive)                                     \
130
    ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE);                       \
131
  ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT));       \
132
  ASM_OUTPUT_LABEL(FILE, NAME);                                         \
133
  ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1);                         \
134
} while (0)
135
 
136
/* This says how to output assembler code to declare an
137
   uninitialized external linkage data object.  */
138
 
139
#undef  ASM_OUTPUT_ALIGNED_BSS
140
#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)           \
141
do {                                                                    \
142
  ASM_OUTPUT_ALIGNED_LOCAL (FILE, NAME, SIZE, ALIGN);                   \
143
} while (0)
144
 
145
/* The biggest alignment supported by ELF in bits. 32-bit ELF
146
   supports section alignment up to (0x80000000 * 8), while
147
   64-bit ELF supports (0x8000000000000000 * 8). If this macro
148
   is not defined, the default is the largest alignment supported
149
   by 32-bit ELF and representable on a 32-bit host. Use this
150
   macro to limit the alignment which can be specified using
151
   the `__attribute__ ((aligned (N)))' construct.
152
 
153
   This value is really 2^63.  Since gcc figures the alignment in bits,
154
   we could only potentially get to 2^60 on suitable hosts.  Due to other
155
   considerations in varasm, we must restrict this to what fits in an int.  */
156
 
157
#undef  MAX_OFILE_ALIGNMENT
158
#define MAX_OFILE_ALIGNMENT (((unsigned int) 1 << 28) * 8)
159
 
160
/* This is the pseudo-op used to generate a contiguous sequence of byte
161
   values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
162
   AUTOMATICALLY APPENDED.  This is the same for most svr4 assemblers.  */
163
 
164
#undef  ASCII_DATA_ASM_OP
165
#define ASCII_DATA_ASM_OP       "\t.ascii\t"
166
 
167
#undef  READONLY_DATA_SECTION_ASM_OP
168
#define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
169
#undef  BSS_SECTION_ASM_OP
170
#define BSS_SECTION_ASM_OP      "\t.section\t.bss"
171
#undef  SBSS_SECTION_ASM_OP
172
#define SBSS_SECTION_ASM_OP     "\t.section\t.sbss,\"aw\""
173
#undef  SDATA_SECTION_ASM_OP
174
#define SDATA_SECTION_ASM_OP    "\t.section\t.sdata,\"aw\""
175
 
176
/* On svr4, we *do* have support for the .init and .fini sections, and we
177
   can put stuff in there to be executed before and after `main'.  We let
178
   crtstuff.c and other files know this by defining the following symbols.
179
   The definitions say how to change sections to the .init and .fini
180
   sections.  This is the same for all known svr4 assemblers.  */
181
 
182
#undef  INIT_SECTION_ASM_OP
183
#define INIT_SECTION_ASM_OP     "\t.section\t.init"
184
#undef  FINI_SECTION_ASM_OP
185
#define FINI_SECTION_ASM_OP     "\t.section\t.fini"
186
 
187
#ifdef HAVE_GAS_SUBSECTION_ORDERING
188
 
189
#define ASM_SECTION_START_OP    "\t.subsection\t-1"
190
 
191
/* Output assembly directive to move to the beginning of current section.  */
192
#define ASM_OUTPUT_SECTION_START(FILE)  \
193
  fprintf ((FILE), "%s\n", ASM_SECTION_START_OP)
194
 
195
#endif
196
 
197
/* Switch into a generic section.  */
198
#define TARGET_ASM_NAMED_SECTION  default_elf_asm_named_section
199
#define TARGET_ASM_SELECT_SECTION  default_elf_select_section
200
 
201
#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
202
 
203
/* Define the strings used for the special svr4 .type and .size directives.
204
   These strings generally do not vary from one system running svr4 to
205
   another, but if a given system (e.g. m88k running svr) needs to use
206
   different pseudo-op names for these, they may be overridden in the
207
   file which includes this one.  */
208
 
209
#undef  TYPE_ASM_OP
210
#define TYPE_ASM_OP     "\t.type\t"
211
#undef  SIZE_ASM_OP
212
#define SIZE_ASM_OP     "\t.size\t"
213
 
214
/* This is how we tell the assembler that a symbol is weak.  */
215
 
216
#undef  ASM_WEAKEN_LABEL
217
#define ASM_WEAKEN_LABEL(FILE, NAME) \
218
  do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
219
       fputc ('\n', FILE); } while (0)
220
 
221
/* This is how we tell the assembler that two symbols have the same value.  */
222
 
223
#undef  ASM_OUTPUT_DEF
224
#define ASM_OUTPUT_DEF(FILE, ALIAS, NAME)                       \
225
  do {                                                          \
226
    assemble_name(FILE, ALIAS);                                 \
227
    fputs(" = ", FILE);                                         \
228
    assemble_name(FILE, NAME);                                  \
229
    fputc('\n', FILE);                                          \
230
  } while (0)
231
 
232
#undef  ASM_OUTPUT_DEF_FROM_DECLS
233
#define ASM_OUTPUT_DEF_FROM_DECLS(FILE, DECL, TARGET)           \
234
  do {                                                          \
235
    const char *alias = XSTR (XEXP (DECL_RTL (DECL), 0), 0);      \
236
    const char *name = IDENTIFIER_POINTER (TARGET);             \
237
    if (TREE_CODE (DECL) == FUNCTION_DECL)                      \
238
      {                                                         \
239
        fputc ('$', FILE);                                      \
240
        assemble_name (FILE, alias);                            \
241
        fputs ("..ng = $", FILE);                               \
242
        assemble_name (FILE, name);                             \
243
        fputs ("..ng\n", FILE);                                 \
244
      }                                                         \
245
    assemble_name(FILE, alias);                                 \
246
    fputs(" = ", FILE);                                         \
247
    assemble_name(FILE, name);                                  \
248
    fputc('\n', FILE);                                          \
249
  } while (0)
250
 
251
/* The following macro defines the format used to output the second
252
   operand of the .type assembler directive.  Different svr4 assemblers
253
   expect various different forms for this operand.  The one given here
254
   is just a default.  You may need to override it in your machine-
255
   specific tm.h file (depending upon the particulars of your assembler).  */
256
 
257
#undef  TYPE_OPERAND_FMT
258
#define TYPE_OPERAND_FMT        "@%s"
259
 
260
/* Write the extra assembler code needed to declare a function's result.
261
   Most svr4 assemblers don't require any special declaration of the
262
   result value, but there are exceptions.  */
263
 
264
#ifndef ASM_DECLARE_RESULT
265
#define ASM_DECLARE_RESULT(FILE, RESULT)
266
#endif
267
 
268
/* These macros generate the special .type and .size directives which
269
   are used to set the corresponding fields of the linker symbol table
270
   entries in an ELF object file under SVR4.  These macros also output
271
   the starting labels for the relevant functions/objects.  */
272
 
273
/* Write the extra assembler code needed to declare an object properly.  */
274
 
275
#ifdef HAVE_GAS_GNU_UNIQUE_OBJECT
276
#define USE_GNU_UNIQUE_OBJECT 1
277
#else
278
#define USE_GNU_UNIQUE_OBJECT 0
279
#endif
280
 
281
#undef  ASM_DECLARE_OBJECT_NAME
282
#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
283
  do {                                                                  \
284
    HOST_WIDE_INT size;                                                 \
285
                                                                        \
286
    /* For template static data member instantiations or                \
287
       inline fn local statics and their guard variables, use           \
288
       gnu_unique_object so that they will be combined even under       \
289
       RTLD_LOCAL.  Don't use gnu_unique_object for typeinfo,           \
290
       vtables and other read-only artificial decls.  */                \
291
    if (USE_GNU_UNIQUE_OBJECT   && DECL_ONE_ONLY (DECL)                 \
292
        && (!DECL_ARTIFICIAL (DECL) || !TREE_READONLY (DECL)))          \
293
      ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "gnu_unique_object");      \
294
    else                                                                \
295
      ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");                 \
296
                                                                        \
297
    size_directive_output = 0;                                           \
298
    if (!flag_inhibit_size_directive                                    \
299
        && (DECL) && DECL_SIZE (DECL))                                  \
300
      {                                                                 \
301
        size_directive_output = 1;                                      \
302
        size = int_size_in_bytes (TREE_TYPE (DECL));                    \
303
        ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size);                   \
304
      }                                                                 \
305
                                                                        \
306
    ASM_OUTPUT_LABEL (FILE, NAME);                                      \
307
  } while (0)
308
 
309
/* Output the size directive for a decl in rest_of_decl_compilation
310
   in the case where we did not do so before the initializer.
311
   Once we find the error_mark_node, we know that the value of
312
   size_directive_output was set
313
   by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
314
 
315
#undef  ASM_FINISH_DECLARE_OBJECT
316
#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)        \
317
  do {                                                                  \
318
    const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);               \
319
    HOST_WIDE_INT size;                                                 \
320
    if (!flag_inhibit_size_directive                                    \
321
        && DECL_SIZE (DECL)                                             \
322
        && ! AT_END && TOP_LEVEL                                        \
323
        && DECL_INITIAL (DECL) == error_mark_node                       \
324
        && !size_directive_output                                       \
325
        && (size = int_size_in_bytes (TREE_TYPE (DECL))) > 0)            \
326
      {                                                                 \
327
        size_directive_output = 1;                                      \
328
        ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size);                   \
329
      }                                                                 \
330
  } while (0)
331
 
332
/* A table of bytes codes used by the ASM_OUTPUT_ASCII and
333
   ASM_OUTPUT_LIMITED_STRING macros.  Each byte in the table
334
   corresponds to a particular byte value [0..255].  For any
335
   given byte value, if the value in the corresponding table
336
   position is zero, the given character can be output directly.
337
   If the table value is 1, the byte must be output as a \ooo
338
   octal escape.  If the tables value is anything else, then the
339
   byte value should be output as a \ followed by the value
340
   in the table.  Note that we can use standard UN*X escape
341
   sequences for many control characters, but we don't use
342
   \a to represent BEL because some svr4 assemblers (e.g. on
343
   the i386) don't know about that.  Also, we don't use \v
344
   since some versions of gas, such as 2.2 did not accept it.  */
345
 
346
#undef  ESCAPES
347
#define ESCAPES \
348
"\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
349
\0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
350
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\
351
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\
352
\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
353
\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
354
\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
355
\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"
356
 
357
/* Some svr4 assemblers have a limit on the number of characters which
358
   can appear in the operand of a .string directive.  If your assembler
359
   has such a limitation, you should define STRING_LIMIT to reflect that
360
   limit.  Note that at least some svr4 assemblers have a limit on the
361
   actual number of bytes in the double-quoted string, and that they
362
   count each character in an escape sequence as one byte.  Thus, an
363
   escape sequence like \377 would count as four bytes.
364
 
365
   If your target assembler doesn't support the .string directive, you
366
   should define this to zero.  */
367
 
368
#undef  STRING_LIMIT
369
#define STRING_LIMIT    ((unsigned) 256)
370
#undef  STRING_ASM_OP
371
#define STRING_ASM_OP   "\t.string\t"
372
 
373
/* GAS is the only Alpha/ELF assembler.  */
374
#undef  TARGET_GAS
375
#define TARGET_GAS      (1)
376
 
377
/* Provide a STARTFILE_SPEC appropriate for ELF.  Here we add the
378
   (even more) magical crtbegin.o file which provides part of the
379
   support for getting C++ file-scope static object constructed
380
   before entering `main'.  */
381
 
382
#undef  STARTFILE_SPEC
383
#ifdef HAVE_LD_PIE
384
#define STARTFILE_SPEC \
385
  "%{!shared: %{pg|p:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}}\
386
   crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
387
#else
388
#define STARTFILE_SPEC \
389
  "%{!shared: %{pg|p:gcrt1.o%s;:crt1.o%s}}\
390
   crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
391
#endif
392
 
393
/* Provide a ENDFILE_SPEC appropriate for ELF.  Here we tack on the
394
   magical crtend.o file which provides part of the support for
395
   getting C++ file-scope static object constructed before entering
396
   `main', followed by a normal ELF "finalizer" file, `crtn.o'.  */
397
 
398
#undef  ENDFILE_SPEC
399
#define ENDFILE_SPEC \
400
  "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
401
   %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
402
 
403
/* We support #pragma.  */
404
#define HANDLE_SYSV_PRAGMA 1
405
 
406
/* Select a format to encode pointers in exception handling data.  CODE
407
   is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
408
   true if the symbol may be affected by dynamic relocations.
409
 
410
   Since application size is already constrained to <2GB by the form of
411
   the ldgp relocation, we can use a 32-bit pc-relative relocation to
412
   static data.  Dynamic data is accessed indirectly to allow for read
413
   only EH sections.  */
414
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)       \
415
  (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4)
416
 
417
/* If defined, a C statement to be executed just prior to the output of
418
   assembler code for INSN.  */
419
#define FINAL_PRESCAN_INSN(INSN, OPVEC, NOPERANDS)      \
420
 (alpha_this_literal_sequence_number = 0,                \
421
  alpha_this_gpdisp_sequence_number = 0)
422
extern int alpha_this_literal_sequence_number;
423
extern int alpha_this_gpdisp_sequence_number;
424
 
425
/* Since the bits of the _init and _fini function is spread across
426
   many object files, each potentially with its own GP, we must assume
427
   we need to load our GP.  Further, the .init/.fini section can
428
   easily be more than 4MB away from the function to call so we can't
429
   use bsr.  */
430
#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
431
   asm (SECTION_OP "\n"                                 \
432
"       br $29,1f\n"                                    \
433
"1:     ldgp $29,0($29)\n"                              \
434
"       unop\n"                                         \
435
"       jsr $26," USER_LABEL_PREFIX #FUNC "\n"          \
436
"       .align 3\n"                                     \
437
"       .previous");
438
 
439
/* If we have the capability create headers for efficient EH lookup.
440
   As of Jan 2002, only glibc 2.2.4 can actually make use of this, but
441
   I imagine that other systems will catch up.  In the meantime, it
442
   doesn't harm to make sure that the data exists to be used later.  */
443
#if defined(HAVE_LD_EH_FRAME_HDR)
444
#define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
445
#endif
446
 
447
/* A C statement (sans semicolon) to output to the stdio stream STREAM
448
   any text necessary for declaring the name of an external symbol
449
   named NAME which is referenced in this compilation but not defined.
450
   It is needed to properly support non-default visibility.  */
451
 
452
#ifndef ASM_OUTPUT_EXTERNAL
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#define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
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  default_elf_asm_output_external (FILE, DECL, NAME)
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#endif

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