1 /* Definitions of various defaults for tm.h macros.
2 Copyright (C) 1992, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
4 Contributed by Ron Guilmette (rfg@monkeys.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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 the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 #ifndef GCC_DEFAULTS_H
24 #define GCC_DEFAULTS_H
26 #ifndef GET_ENVIRONMENT
27 #define GET_ENVIRONMENT(VALUE, NAME) do { (VALUE) = getenv (NAME); } while (0)
30 #define obstack_chunk_alloc xmalloc
31 #define obstack_chunk_free free
33 /* Define default standard character escape sequences. */
35 # define TARGET_BELL 007
36 # define TARGET_BS 010
37 # define TARGET_TAB 011
38 # define TARGET_NEWLINE 012
39 # define TARGET_VT 013
40 # define TARGET_FF 014
41 # define TARGET_CR 015
42 # define TARGET_ESC 033
45 /* When removal of CPP_PREDEFINES is complete, TARGET_CPU_CPP_BULITINS
46 can also be removed from here. */
47 #ifndef TARGET_OS_CPP_BUILTINS
48 # define TARGET_OS_CPP_BUILTINS()
50 #ifndef TARGET_CPU_CPP_BUILTINS
51 # define TARGET_CPU_CPP_BUILTINS()
53 #ifndef CPP_PREDEFINES
54 # define CPP_PREDEFINES ""
57 /* Store in OUTPUT a string (made with alloca) containing
58 an assembler-name for a local static variable or function named NAME.
59 LABELNO is an integer which is different for each call. */
61 #ifndef ASM_FORMAT_PRIVATE_NAME
62 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
64 int len = strlen (NAME); \
65 char *temp = (char *) alloca (len + 3); \
67 strcpy (&temp[1], (NAME)); \
68 temp[len + 1] = '.'; \
70 (OUTPUT) = (char *) alloca (strlen (NAME) + 11); \
71 ASM_GENERATE_INTERNAL_LABEL (OUTPUT, temp, LABELNO); \
76 #define ASM_STABD_OP "\t.stabd\t"
79 /* This is how to output an element of a case-vector that is absolute.
80 Some targets don't use this, but we have to define it anyway. */
82 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
83 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
84 do { fputs (integer_asm_op (POINTER_SIZE / UNITS_PER_WORD, TRUE), FILE); \
85 ASM_OUTPUT_INTERNAL_LABEL (FILE, "L", (VALUE)); \
90 /* choose a reasonable default for ASM_OUTPUT_ASCII. */
92 #ifndef ASM_OUTPUT_ASCII
93 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
95 FILE *_hide_asm_out_file = (MYFILE); \
96 const unsigned char *_hide_p = (const unsigned char *) (MYSTRING); \
97 int _hide_thissize = (MYLENGTH); \
99 FILE *asm_out_file = _hide_asm_out_file; \
100 const unsigned char *p = _hide_p; \
101 int thissize = _hide_thissize; \
103 fprintf (asm_out_file, "\t.ascii \""); \
105 for (i = 0; i < thissize; i++) \
108 if (c == '\"' || c == '\\') \
109 putc ('\\', asm_out_file); \
111 putc (c, asm_out_file); \
114 fprintf (asm_out_file, "\\%o", c); \
115 /* After an octal-escape, if a digit follows, \
116 terminate one string constant and start another. \
117 The VAX assembler fails to stop reading the escape \
118 after three digits, so this is the only way we \
119 can get it to parse the data properly. */ \
120 if (i < thissize - 1 && ISDIGIT(p[i + 1])) \
121 fprintf (asm_out_file, "\"\n\t.ascii \""); \
124 fprintf (asm_out_file, "\"\n"); \
130 /* This is how we tell the assembler to equate two values. */
132 #ifndef ASM_OUTPUT_DEF
133 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
134 do { fprintf ((FILE), "%s", SET_ASM_OP); \
135 assemble_name (FILE, LABEL1); \
136 fprintf (FILE, ","); \
137 assemble_name (FILE, LABEL2); \
138 fprintf (FILE, "\n"); \
143 /* This is how to output a reference to a user-level label named NAME. */
145 #ifndef ASM_OUTPUT_LABELREF
146 #define ASM_OUTPUT_LABELREF(FILE,NAME) asm_fprintf ((FILE), "%U%s", (NAME))
149 /* Allow target to print debug info labels specially. This is useful for
150 VLIW targets, since debug info labels should go into the middle of
151 instruction bundles instead of breaking them. */
153 #ifndef ASM_OUTPUT_DEBUG_LABEL
154 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
155 ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM)
158 /* This is how we tell the assembler that a symbol is weak. */
159 #ifndef ASM_OUTPUT_WEAK_ALIAS
160 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
161 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE) \
164 ASM_WEAKEN_LABEL (STREAM, NAME); \
166 ASM_OUTPUT_DEF (STREAM, NAME, VALUE); \
172 /* This determines whether or not we support weak symbols. */
173 #ifndef SUPPORTS_WEAK
174 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
175 #define SUPPORTS_WEAK 1
177 #define SUPPORTS_WEAK 0
181 /* This determines whether or not we support link-once semantics. */
182 #ifndef SUPPORTS_ONE_ONLY
183 #ifdef MAKE_DECL_ONE_ONLY
184 #define SUPPORTS_ONE_ONLY 1
186 #define SUPPORTS_ONE_ONLY 0
190 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
191 provide a weak attribute. Else define it to nothing.
193 This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
194 not available at that time.
196 Note, this is only for use by target files which we know are to be
198 #ifndef TARGET_ATTRIBUTE_WEAK
200 # define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
202 # define TARGET_ATTRIBUTE_WEAK
206 /* If the target supports init_priority C++ attribute, give
207 SUPPORTS_INIT_PRIORITY a nonzero value. */
208 #ifndef SUPPORTS_INIT_PRIORITY
209 #define SUPPORTS_INIT_PRIORITY 1
210 #endif /* SUPPORTS_INIT_PRIORITY */
212 /* If duplicate library search directories can be removed from a
213 linker command without changing the linker's semantics, give this
215 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
216 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
217 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
219 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
220 the rest of the DWARF 2 frame unwind support is also provided. */
221 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
222 #define DWARF2_UNWIND_INFO 1
225 /* If we have named sections, and we're using crtstuff to run ctors,
226 use them for registering eh frame information. */
227 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
228 && !defined(EH_FRAME_IN_DATA_SECTION)
229 #ifndef EH_FRAME_SECTION_NAME
230 #define EH_FRAME_SECTION_NAME ".eh_frame"
234 /* If we have named section and we support weak symbols, then use the
235 .jcr section for recording java classes which need to be registered
236 at program start-up time. */
237 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
238 #ifndef JCR_SECTION_NAME
239 #define JCR_SECTION_NAME ".jcr"
243 /* By default, we generate a label at the beginning and end of the
244 text section, and compute the size of the text section by
245 subtracting the two. However, on some platforms that doesn't
246 work, and we use the section itself, rather than a label at the
247 beginning of it, to indicate the start of the section. On such
248 platforms, define this to zero. */
249 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
250 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
253 /* Supply a default definition for PROMOTE_PROTOTYPES. */
254 #ifndef PROMOTE_PROTOTYPES
255 #define PROMOTE_PROTOTYPES 0
258 /* Number of hardware registers that go into the DWARF-2 unwind info.
259 If not defined, equals FIRST_PSEUDO_REGISTER */
261 #ifndef DWARF_FRAME_REGISTERS
262 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
265 /* How to renumber registers for dbx and gdb. If not defined, assume
266 no renumbering is necessary. */
268 #ifndef DBX_REGISTER_NUMBER
269 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
272 /* Default sizes for base C types. If the sizes are different for
273 your target, you should override these values by defining the
274 appropriate symbols in your tm.h file. */
276 #ifndef BITS_PER_UNIT
277 #define BITS_PER_UNIT 8
280 #ifndef BITS_PER_WORD
281 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
284 #ifndef CHAR_TYPE_SIZE
285 #define CHAR_TYPE_SIZE BITS_PER_UNIT
288 #ifndef BOOL_TYPE_SIZE
289 /* `bool' has size and alignment `1', on almost all platforms. */
290 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
293 #ifndef SHORT_TYPE_SIZE
294 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
297 #ifndef INT_TYPE_SIZE
298 #define INT_TYPE_SIZE BITS_PER_WORD
301 #ifndef LONG_TYPE_SIZE
302 #define LONG_TYPE_SIZE BITS_PER_WORD
305 #ifndef LONG_LONG_TYPE_SIZE
306 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
309 #ifndef WCHAR_TYPE_SIZE
310 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
313 #ifndef FLOAT_TYPE_SIZE
314 #define FLOAT_TYPE_SIZE BITS_PER_WORD
317 #ifndef DOUBLE_TYPE_SIZE
318 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
321 #ifndef LONG_DOUBLE_TYPE_SIZE
322 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
325 /* Width in bits of a pointer. Mind the value of the macro `Pmode'. */
327 #define POINTER_SIZE BITS_PER_WORD
330 #ifndef BUILD_VA_LIST_TYPE
331 #define BUILD_VA_LIST_TYPE(X) ((X) = ptr_type_node)
334 #ifndef PIC_OFFSET_TABLE_REGNUM
335 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
338 /* Type used by GCOV counters. Use 64bit data type if target supports
340 #if LONG_TYPE_SIZE >= 64
341 #define GCOV_TYPE_SIZE LONG_TYPE_SIZE
343 #define GCOV_TYPE_SIZE LONG_LONG_TYPE_SIZE
347 /* By default, the preprocessor should be invoked the same way in C++
349 #ifndef CPLUSPLUS_CPP_SPEC
351 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
355 #ifndef ACCUMULATE_OUTGOING_ARGS
356 #define ACCUMULATE_OUTGOING_ARGS 0
359 /* Supply a default definition for PUSH_ARGS. */
362 #define PUSH_ARGS !ACCUMULATE_OUTGOING_ARGS
368 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
369 STACK_BOUNDARY is required. */
370 #ifndef PREFERRED_STACK_BOUNDARY
371 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
374 /* By default, the C++ compiler will use function addresses in the
375 vtable entries. Setting this non-zero tells the compiler to use
376 function descriptors instead. The value of this macro says how
377 many words wide the descriptor is (normally 2). It is assumed
378 that the address of a function descriptor may be treated as a
379 pointer to a function. */
380 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
381 #define TARGET_VTABLE_USES_DESCRIPTORS 0
384 /* By default, the vtable entries are void pointers, the so the alignment
385 is the same as pointer alignment. The value of this macro specifies
386 the alignment of the vtable entry in bits. It should be defined only
387 when special alignment is necessary. */
388 #ifndef TARGET_VTABLE_ENTRY_ALIGN
389 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
392 /* There are a few non-descriptor entries in the vtable at offsets below
393 zero. If these entries must be padded (say, to preserve the alignment
394 specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
395 words in each data entry. */
396 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
397 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
400 /* Select a format to encode pointers in exception handling data. We
401 prefer those that result in fewer dynamic relocations. Assume no
402 special support here and encode direct references. */
403 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
404 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) DW_EH_PE_absptr
407 /* By default, the C++ compiler will use the lowest bit of the pointer
408 to function to indicate a pointer-to-member-function points to a
409 virtual member function. However, if FUNCTION_BOUNDARY indicates
410 function addresses aren't always even, the lowest bit of the delta
411 field will be used. */
412 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
413 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
414 (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
415 ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
418 #ifndef DEFAULT_GDB_EXTENSIONS
419 #define DEFAULT_GDB_EXTENSIONS 1
422 /* If more than one debugging type is supported, you must define
423 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
425 This is one long line cause VAXC can't handle a \-newline. */
426 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) + defined (VMS_DEBUGGING_INFO))
427 #ifndef PREFERRED_DEBUGGING_TYPE
428 You Lose! You must define PREFERRED_DEBUGGING_TYPE!
429 #endif /* no PREFERRED_DEBUGGING_TYPE */
430 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
431 so other code needn't care. */
432 #ifdef DBX_DEBUGGING_INFO
433 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
435 #ifdef SDB_DEBUGGING_INFO
436 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
438 #ifdef DWARF_DEBUGGING_INFO
439 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
441 #ifdef DWARF2_DEBUGGING_INFO
442 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
444 #ifdef VMS_DEBUGGING_INFO
445 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
447 #ifdef XCOFF_DEBUGGING_INFO
448 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
450 #endif /* More than one debugger format enabled. */
452 /* If still not defined, must have been because no debugging formats
454 #ifndef PREFERRED_DEBUGGING_TYPE
455 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
458 /* This is set to 1 if BYTES_BIG_ENDIAN is defined but the target uses a
459 little-endian method of passing and returning structures in registers.
460 On the HP-UX IA64 and PA64 platforms structures are aligned differently
461 then integral values and setting this value to 1 will allow for the
462 special handling of structure arguments and return values in regs. */
464 #ifndef FUNCTION_ARG_REG_LITTLE_ENDIAN
465 #define FUNCTION_ARG_REG_LITTLE_ENDIAN 0
468 /* Determine the register class for registers suitable to be the base
469 address register in a MEM. Allow the choice to be dependent upon
470 the mode of the memory access. */
471 #ifndef MODE_BASE_REG_CLASS
472 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
475 #ifndef LARGEST_EXPONENT_IS_NORMAL
476 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
479 #ifndef ROUND_TOWARDS_ZERO
480 #define ROUND_TOWARDS_ZERO 0
483 #ifndef MODE_HAS_NANS
484 #define MODE_HAS_NANS(MODE) \
485 (FLOAT_MODE_P (MODE) \
486 && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT \
487 && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
490 #ifndef MODE_HAS_INFINITIES
491 #define MODE_HAS_INFINITIES(MODE) \
492 (FLOAT_MODE_P (MODE) \
493 && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT \
494 && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
497 #ifndef MODE_HAS_SIGNED_ZEROS
498 #define MODE_HAS_SIGNED_ZEROS(MODE) \
499 (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
502 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
503 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE) \
504 (FLOAT_MODE_P (MODE) \
505 && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT \
506 && !ROUND_TOWARDS_ZERO)
509 #ifndef HOT_TEXT_SECTION_NAME
510 #define HOT_TEXT_SECTION_NAME "text.hot"
513 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
514 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME "text.unlikely"
517 #ifndef VECTOR_MODE_SUPPORTED_P
518 #define VECTOR_MODE_SUPPORTED_P(MODE) 0
521 /* Determine whether __cxa_atexit, rather than atexit, is used to
522 register C++ destructors for local statics and global objects. */
523 #ifndef DEFAULT_USE_CXA_ATEXIT
524 #define DEFAULT_USE_CXA_ATEXIT 0
527 #endif /* ! GCC_DEFAULTS_H */