defaults.h revision 102780 
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)
5
6This file is part of GCC.
7
8GCC is free software; you can redistribute it and/or modify it under
9the terms of the GNU General Public License as published by the Free
10Software Foundation; either version 2, or (at your option) any later
11version.
12
13GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14WARRANTY; without even the implied warranty of MERCHANTABILITY or
15FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16for more details.
17
18You should have received a copy of the GNU General Public License
19along with GCC; see the file COPYING.  If not, write to the Free
20Software Foundation, 59 Temple Place - Suite 330, Boston, MA
2102111-1307, USA.  */
22
23#ifndef GCC_DEFAULTS_H
24#define GCC_DEFAULTS_H
25
26/* Define default standard character escape sequences.  */
27#ifndef TARGET_BELL
28#  define TARGET_BELL 007
29#  define TARGET_BS 010
30#  define TARGET_TAB 011
31#  define TARGET_NEWLINE 012
32#  define TARGET_VT 013
33#  define TARGET_FF 014
34#  define TARGET_CR 015
35#  define TARGET_ESC 033
36#endif
37
38/* Store in OUTPUT a string (made with alloca) containing
39   an assembler-name for a local static variable or function named NAME.
40   LABELNO is an integer which is different for each call.  */
41
42#ifndef ASM_FORMAT_PRIVATE_NAME
43#define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO)			\
44  do {									\
45    int len = strlen (NAME);						\
46    char *temp = (char *) alloca (len + 3);				\
47    temp[0] = 'L';							\
48    strcpy (&temp[1], (NAME));						\
49    temp[len + 1] = '.';						\
50    temp[len + 2] = 0;							\
51    (OUTPUT) = (char *) alloca (strlen (NAME) + 11);			\
52    ASM_GENERATE_INTERNAL_LABEL (OUTPUT, temp, LABELNO);		\
53  } while (0)
54#endif
55
56#ifndef ASM_STABD_OP
57#define ASM_STABD_OP "\t.stabd\t"
58#endif
59
60/* This is how to output an element of a case-vector that is absolute.
61   Some targets don't use this, but we have to define it anyway.  */
62
63#ifndef ASM_OUTPUT_ADDR_VEC_ELT
64#define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
65do { fputs (integer_asm_op (POINTER_SIZE / UNITS_PER_WORD, TRUE), FILE); \
66     ASM_OUTPUT_INTERNAL_LABEL (FILE, "L", (VALUE));			\
67     fputc ('\n', FILE);						\
68   } while (0)
69#endif
70
71/* Provide default for ASM_OUTPUT_ALTERNATE_LABEL_NAME.  */
72#ifndef ASM_OUTPUT_ALTERNATE_LABEL_NAME
73#define ASM_OUTPUT_ALTERNATE_LABEL_NAME(FILE,INSN) \
74do { ASM_OUTPUT_LABEL(FILE,LABEL_ALTERNATE_NAME (INSN)); } while (0)
75#endif
76
77/* choose a reasonable default for ASM_OUTPUT_ASCII.  */
78
79#ifndef ASM_OUTPUT_ASCII
80#define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
81  do {									      \
82    FILE *_hide_asm_out_file = (MYFILE);				      \
83    const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);	      \
84    int _hide_thissize = (MYLENGTH);					      \
85    {									      \
86      FILE *asm_out_file = _hide_asm_out_file;				      \
87      const unsigned char *p = _hide_p;					      \
88      int thissize = _hide_thissize;					      \
89      int i;								      \
90      fprintf (asm_out_file, "\t.ascii \"");				      \
91									      \
92      for (i = 0; i < thissize; i++)					      \
93	{								      \
94	  int c = p[i];			   				      \
95	  if (c == '\"' || c == '\\')					      \
96	    putc ('\\', asm_out_file);					      \
97	  if (ISPRINT(c))						      \
98	    putc (c, asm_out_file);					      \
99	  else								      \
100	    {								      \
101	      fprintf (asm_out_file, "\\%o", c);			      \
102	      /* After an octal-escape, if a digit follows,		      \
103		 terminate one string constant and start another.	      \
104		 The VAX assembler fails to stop reading the escape	      \
105		 after three digits, so this is the only way we		      \
106		 can get it to parse the data properly.  */		      \
107	      if (i < thissize - 1 && ISDIGIT(p[i + 1]))		      \
108		fprintf (asm_out_file, "\"\n\t.ascii \"");		      \
109	  }								      \
110	}								      \
111      fprintf (asm_out_file, "\"\n");					      \
112    }									      \
113  }									      \
114  while (0)
115#endif
116
117/* This is how we tell the assembler to equate two values.  */
118#ifdef SET_ASM_OP
119#ifndef ASM_OUTPUT_DEF
120#define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)				\
121 do {	fprintf ((FILE), "%s", SET_ASM_OP);				\
122	assemble_name (FILE, LABEL1);					\
123	fprintf (FILE, ",");						\
124	assemble_name (FILE, LABEL2);					\
125	fprintf (FILE, "\n");						\
126  } while (0)
127#endif
128#endif
129
130/* This is how to output a reference to a user-level label named NAME.  */
131
132#ifndef ASM_OUTPUT_LABELREF
133#define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
134#endif
135
136/* Allow target to print debug info labels specially.  This is useful for
137   VLIW targets, since debug info labels should go into the middle of
138   instruction bundles instead of breaking them.  */
139
140#ifndef ASM_OUTPUT_DEBUG_LABEL
141#define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
142  ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM)
143#endif
144
145/* This is how we tell the assembler that a symbol is weak.  */
146#ifndef ASM_OUTPUT_WEAK_ALIAS
147#if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
148#define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)	\
149  do							\
150    {							\
151      ASM_WEAKEN_LABEL (STREAM, NAME);			\
152      if (VALUE)					\
153        ASM_OUTPUT_DEF (STREAM, NAME, VALUE);		\
154    }							\
155  while (0)
156#endif
157#endif
158
159/* This determines whether or not we support weak symbols.  */
160#ifndef SUPPORTS_WEAK
161#if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
162#define SUPPORTS_WEAK 1
163#else
164#define SUPPORTS_WEAK 0
165#endif
166#endif
167
168/* This determines whether or not we support link-once semantics.  */
169#ifndef SUPPORTS_ONE_ONLY
170#ifdef MAKE_DECL_ONE_ONLY
171#define SUPPORTS_ONE_ONLY 1
172#else
173#define SUPPORTS_ONE_ONLY 0
174#endif
175#endif
176
177/* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
178   provide a weak attribute.  Else define it to nothing.
179
180   This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
181   not available at that time.
182
183   Note, this is only for use by target files which we know are to be
184   compiled by GCC.  */
185#ifndef TARGET_ATTRIBUTE_WEAK
186# if SUPPORTS_WEAK
187#  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
188# else
189#  define TARGET_ATTRIBUTE_WEAK
190# endif
191#endif
192
193/* If the target supports init_priority C++ attribute, give
194   SUPPORTS_INIT_PRIORITY a nonzero value.  */
195#ifndef SUPPORTS_INIT_PRIORITY
196#define SUPPORTS_INIT_PRIORITY 1
197#endif /* SUPPORTS_INIT_PRIORITY */
198
199/* If duplicate library search directories can be removed from a
200   linker command without changing the linker's semantics, give this
201   symbol a nonzero.  */
202#ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
203#define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
204#endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
205
206/* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
207   the rest of the DWARF 2 frame unwind support is also provided.  */
208#if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
209#define DWARF2_UNWIND_INFO 1
210#endif
211
212/* If we have named sections, and we're using crtstuff to run ctors,
213   use them for registering eh frame information.  */
214#if defined (TARGET_ASM_NAMED_SECTION) && !defined(EH_FRAME_IN_DATA_SECTION)
215#ifndef EH_FRAME_SECTION_NAME
216#define EH_FRAME_SECTION_NAME ".eh_frame"
217#endif
218#endif
219
220/* If we have named section and we support weak symbols, then use the
221   .jcr section for recording java classes which need to be registered
222   at program start-up time.  */
223#if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
224#ifndef JCR_SECTION_NAME
225#define JCR_SECTION_NAME ".jcr"
226#endif
227#endif
228
229/* If we have no definition for UNIQUE_SECTION, but do have the
230   ability to generate arbitrary sections, construct something
231   reasonable.  */
232#ifndef UNIQUE_SECTION
233#define UNIQUE_SECTION(DECL,RELOC)				\
234do {								\
235  int len;							\
236  const char *name;						\
237  char *string;							\
238								\
239  name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));	\
240  /* Strip off any encoding in name.  */			\
241  STRIP_NAME_ENCODING (name, name);				\
242								\
243  len = strlen (name) + 1;					\
244  string = alloca (len + 1);					\
245  sprintf (string, ".%s", name);				\
246								\
247  DECL_SECTION_NAME (DECL) = build_string (len, string);	\
248} while (0)
249#endif
250
251/* By default, we generate a label at the beginning and end of the
252   text section, and compute the size of the text section by
253   subtracting the two.  However, on some platforms that doesn't
254   work, and we use the section itself, rather than a label at the
255   beginning of it, to indicate the start of the section.  On such
256   platforms, define this to zero.  */
257#ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
258#define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
259#endif
260
261/* Supply a default definition for PROMOTE_PROTOTYPES.  */
262#ifndef PROMOTE_PROTOTYPES
263#define PROMOTE_PROTOTYPES	0
264#endif
265
266/* Number of hardware registers that go into the DWARF-2 unwind info.
267   If not defined, equals FIRST_PSEUDO_REGISTER  */
268
269#ifndef DWARF_FRAME_REGISTERS
270#define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
271#endif
272
273/* How to renumber registers for dbx and gdb.  If not defined, assume
274   no renumbering is necessary.  */
275
276#ifndef DBX_REGISTER_NUMBER
277#define DBX_REGISTER_NUMBER(REGNO) (REGNO)
278#endif
279
280/* Default sizes for base C types.  If the sizes are different for
281   your target, you should override these values by defining the
282   appropriate symbols in your tm.h file.  */
283
284#ifndef CHAR_TYPE_SIZE
285#define CHAR_TYPE_SIZE BITS_PER_UNIT
286#endif
287
288#ifndef BOOL_TYPE_SIZE
289/* `bool' has size and alignment `1', on almost all platforms.  */
290#define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
291#endif
292
293#ifndef SHORT_TYPE_SIZE
294#define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
295#endif
296
297#ifndef INT_TYPE_SIZE
298#define INT_TYPE_SIZE BITS_PER_WORD
299#endif
300
301#ifndef LONG_TYPE_SIZE
302#define LONG_TYPE_SIZE BITS_PER_WORD
303#endif
304
305#ifndef LONG_LONG_TYPE_SIZE
306#define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
307#endif
308
309#ifndef WCHAR_TYPE_SIZE
310#define WCHAR_TYPE_SIZE INT_TYPE_SIZE
311#endif
312
313#ifndef WCHAR_UNSIGNED
314#define WCHAR_UNSIGNED 0
315#endif
316
317#ifndef FLOAT_TYPE_SIZE
318#define FLOAT_TYPE_SIZE BITS_PER_WORD
319#endif
320
321#ifndef DOUBLE_TYPE_SIZE
322#define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
323#endif
324
325#ifndef LONG_DOUBLE_TYPE_SIZE
326#define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
327#endif
328
329#ifndef BUILD_VA_LIST_TYPE
330#define BUILD_VA_LIST_TYPE(X) ((X) = ptr_type_node)
331#endif
332
333#ifndef PIC_OFFSET_TABLE_REGNUM
334#define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
335#endif
336
337/* Type used by GCOV counters.  Use 64bit data type if target supports
338   it.  */
339#if LONG_TYPE_SIZE >= 64
340#define GCOV_TYPE_SIZE LONG_TYPE_SIZE
341#else
342#define GCOV_TYPE_SIZE LONG_LONG_TYPE_SIZE
343#endif
344
345
346/* By default, the preprocessor should be invoked the same way in C++
347   as in C.  */
348#ifndef CPLUSPLUS_CPP_SPEC
349#ifdef CPP_SPEC
350#define CPLUSPLUS_CPP_SPEC CPP_SPEC
351#endif
352#endif
353
354#ifndef ACCUMULATE_OUTGOING_ARGS
355#define ACCUMULATE_OUTGOING_ARGS 0
356#endif
357
358/* Supply a default definition for PUSH_ARGS.  */
359#ifndef PUSH_ARGS
360#ifdef PUSH_ROUNDING
361#define PUSH_ARGS	!ACCUMULATE_OUTGOING_ARGS
362#else
363#define PUSH_ARGS	0
364#endif
365#endif
366
367/* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
368   STACK_BOUNDARY is required.  */
369#ifndef PREFERRED_STACK_BOUNDARY
370#define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
371#endif
372
373/* By default, the C++ compiler will use function addresses in the
374   vtable entries.  Setting this non-zero tells the compiler to use
375   function descriptors instead.  The value of this macro says how
376   many words wide the descriptor is (normally 2).  It is assumed
377   that the address of a function descriptor may be treated as a
378   pointer to a function.  */
379#ifndef TARGET_VTABLE_USES_DESCRIPTORS
380#define TARGET_VTABLE_USES_DESCRIPTORS 0
381#endif
382
383/* Select a format to encode pointers in exception handling data.  We
384   prefer those that result in fewer dynamic relocations.  Assume no
385   special support here and encode direct references.  */
386#ifndef ASM_PREFERRED_EH_DATA_FORMAT
387#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
388#endif
389
390/* By default, the C++ compiler will use the lowest bit of the pointer
391   to function to indicate a pointer-to-member-function points to a
392   virtual member function.  However, if FUNCTION_BOUNDARY indicates
393   function addresses aren't always even, the lowest bit of the delta
394   field will be used.  */
395#ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
396#define TARGET_PTRMEMFUNC_VBIT_LOCATION \
397  (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
398   ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
399#endif
400
401/* True if it is possible to profile code that does not have a frame
402   pointer.  */
403
404#ifndef TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
405#define TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER true
406#endif
407
408#ifndef DEFAULT_GDB_EXTENSIONS
409#define DEFAULT_GDB_EXTENSIONS 1
410#endif
411
412/* If more than one debugging type is supported, you must define
413   PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
414
415   This is one long line cause VAXC can't handle a \-newline.  */
416#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))
417#ifndef PREFERRED_DEBUGGING_TYPE
418You Lose!  You must define PREFERRED_DEBUGGING_TYPE!
419#endif /* no PREFERRED_DEBUGGING_TYPE */
420#else /* Only one debugging format supported.  Define PREFERRED_DEBUGGING_TYPE
421	 so other code needn't care.  */
422#ifdef DBX_DEBUGGING_INFO
423#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
424#endif
425#ifdef SDB_DEBUGGING_INFO
426#define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
427#endif
428#ifdef DWARF_DEBUGGING_INFO
429#define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
430#endif
431#ifdef DWARF2_DEBUGGING_INFO
432#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
433#endif
434#ifdef VMS_DEBUGGING_INFO
435#define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
436#endif
437#ifdef XCOFF_DEBUGGING_INFO
438#define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
439#endif
440#endif /* More than one debugger format enabled.  */
441
442/* If still not defined, must have been because no debugging formats
443   are supported.  */
444#ifndef PREFERRED_DEBUGGING_TYPE
445#define PREFERRED_DEBUGGING_TYPE NO_DEBUG
446#endif
447
448/* This is set to 1 if BYTES_BIG_ENDIAN is defined but the target uses a
449   little-endian method of passing and returning structures in registers.
450   On the HP-UX IA64 and PA64 platforms structures are aligned differently
451   then integral values and setting this value to 1 will allow for the
452   special handling of structure arguments and return values in regs.  */
453
454#ifndef FUNCTION_ARG_REG_LITTLE_ENDIAN
455#define FUNCTION_ARG_REG_LITTLE_ENDIAN 0
456#endif
457
458/* Determine the register class for registers suitable to be the base
459   address register in a MEM.  Allow the choice to be dependent upon
460   the mode of the memory access.  */
461#ifndef MODE_BASE_REG_CLASS
462#define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
463#endif
464
465/* Determine whether __cxa_atexit, rather than atexit, is used to
466   register C++ destructors for local statics and global objects. */
467#ifndef DEFAULT_USE_CXA_ATEXIT
468#define DEFAULT_USE_CXA_ATEXIT 0
469#endif
470
471#endif  /* ! GCC_DEFAULTS_H */
472