1 /* Definitions of various defaults for tm.h macros.
2 Copyright (C) 1992, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
5 Contributed by Ron Guilmette (rfg@monkeys.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 Under Section 7 of GPL version 3, you are granted additional
20 permissions described in the GCC Runtime Library Exception, version
21 3.1, as published by the Free Software Foundation.
23 You should have received a copy of the GNU General Public License and
24 a copy of the GCC Runtime Library Exception along with this program;
25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
26 <http://www.gnu.org/licenses/>. */
28 #ifndef GCC_DEFAULTS_H
29 #define GCC_DEFAULTS_H
31 #ifndef GET_ENVIRONMENT
32 #define GET_ENVIRONMENT(VALUE, NAME) do { (VALUE) = getenv (NAME); } while (0)
35 /* Store in OUTPUT a string (made with alloca) containing an
36 assembler-name for a local static variable or function named NAME.
37 LABELNO is an integer which is different for each call. */
40 # ifndef NO_DOT_IN_LABEL
41 # define ASM_PN_FORMAT "%s.%lu"
43 # ifndef NO_DOLLAR_IN_LABEL
44 # define ASM_PN_FORMAT "%s$%lu"
46 # define ASM_PN_FORMAT "__%s_%lu"
49 #endif /* ! ASM_PN_FORMAT */
51 #ifndef ASM_FORMAT_PRIVATE_NAME
52 # define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
53 do { const char *const name_ = (NAME); \
54 char *const output_ = (OUTPUT) = \
55 (char *) alloca (strlen (name_) + 32); \
56 sprintf (output_, ASM_PN_FORMAT, name_, (unsigned long)(LABELNO)); \
60 /* Choose a reasonable default for ASM_OUTPUT_ASCII. */
62 #ifndef ASM_OUTPUT_ASCII
63 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
65 FILE *_hide_asm_out_file = (MYFILE); \
66 const unsigned char *_hide_p = (const unsigned char *) (MYSTRING); \
67 int _hide_thissize = (MYLENGTH); \
69 FILE *asm_out_file = _hide_asm_out_file; \
70 const unsigned char *p = _hide_p; \
71 int thissize = _hide_thissize; \
73 fprintf (asm_out_file, "\t.ascii \""); \
75 for (i = 0; i < thissize; i++) \
78 if (c == '\"' || c == '\\') \
79 putc ('\\', asm_out_file); \
81 putc (c, asm_out_file); \
84 fprintf (asm_out_file, "\\%o", c); \
85 /* After an octal-escape, if a digit follows, \
86 terminate one string constant and start another. \
87 The VAX assembler fails to stop reading the escape \
88 after three digits, so this is the only way we \
89 can get it to parse the data properly. */ \
90 if (i < thissize - 1 && ISDIGIT(p[i + 1])) \
91 fprintf (asm_out_file, "\"\n\t.ascii \""); \
94 fprintf (asm_out_file, "\"\n"); \
100 /* This is how we tell the assembler to equate two values. */
102 #ifndef ASM_OUTPUT_DEF
103 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
104 do { fprintf ((FILE), "%s", SET_ASM_OP); \
105 assemble_name (FILE, LABEL1); \
106 fprintf (FILE, ","); \
107 assemble_name (FILE, LABEL2); \
108 fprintf (FILE, "\n"); \
113 #ifndef TLS_COMMON_ASM_OP
114 #define TLS_COMMON_ASM_OP ".tls_common"
117 #if defined (HAVE_AS_TLS) && !defined (ASM_OUTPUT_TLS_COMMON)
118 #define ASM_OUTPUT_TLS_COMMON(FILE, DECL, NAME, SIZE) \
121 fprintf ((FILE), "\t%s\t", TLS_COMMON_ASM_OP); \
122 assemble_name ((FILE), (NAME)); \
123 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
124 (SIZE), DECL_ALIGN (DECL) / BITS_PER_UNIT); \
129 /* Decide whether to defer emitting the assembler output for an equate
130 of two values. The default is to not defer output. */
131 #ifndef TARGET_DEFERRED_OUTPUT_DEFS
132 #define TARGET_DEFERRED_OUTPUT_DEFS(DECL,TARGET) false
135 /* This is how to output the definition of a user-level label named
136 NAME, such as the label on a static function or variable NAME. */
138 #ifndef ASM_OUTPUT_LABEL
139 #define ASM_OUTPUT_LABEL(FILE,NAME) \
140 do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
143 /* Output the definition of a compiler-generated label named NAME. */
144 #ifndef ASM_OUTPUT_INTERNAL_LABEL
145 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,NAME) \
147 assemble_name_raw ((FILE), (NAME)); \
148 fputs (":\n", (FILE)); \
152 /* This is how to output a reference to a user-level label named NAME. */
154 #ifndef ASM_OUTPUT_LABELREF
155 #define ASM_OUTPUT_LABELREF(FILE,NAME) asm_fprintf ((FILE), "%U%s", (NAME))
158 /* Allow target to print debug info labels specially. This is useful for
159 VLIW targets, since debug info labels should go into the middle of
160 instruction bundles instead of breaking them. */
162 #ifndef ASM_OUTPUT_DEBUG_LABEL
163 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
164 (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
167 /* This is how we tell the assembler that a symbol is weak. */
168 #ifndef ASM_OUTPUT_WEAK_ALIAS
169 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
170 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE) \
173 ASM_WEAKEN_LABEL (STREAM, NAME); \
175 ASM_OUTPUT_DEF (STREAM, NAME, VALUE); \
181 /* This is how we tell the assembler that a symbol is a weak alias to
182 another symbol that doesn't require the other symbol to be defined.
183 Uses of the former will turn into weak uses of the latter, i.e.,
184 uses that, in case the latter is undefined, will not cause errors,
185 and will add it to the symbol table as weak undefined. However, if
186 the latter is referenced directly, a strong reference prevails. */
187 #ifndef ASM_OUTPUT_WEAKREF
188 #if defined HAVE_GAS_WEAKREF
189 #define ASM_OUTPUT_WEAKREF(FILE, DECL, NAME, VALUE) \
192 fprintf ((FILE), "\t.weakref\t"); \
193 assemble_name ((FILE), (NAME)); \
194 fprintf ((FILE), ","); \
195 assemble_name ((FILE), (VALUE)); \
196 fprintf ((FILE), "\n"); \
202 /* How to emit a .type directive. */
203 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
204 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
205 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE) \
208 fputs (TYPE_ASM_OP, STREAM); \
209 assemble_name (STREAM, NAME); \
210 fputs (", ", STREAM); \
211 fprintf (STREAM, TYPE_OPERAND_FMT, TYPE); \
212 putc ('\n', STREAM); \
218 /* How to emit a .size directive. */
219 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
221 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE) \
224 HOST_WIDE_INT size_ = (SIZE); \
225 fputs (SIZE_ASM_OP, STREAM); \
226 assemble_name (STREAM, NAME); \
227 fprintf (STREAM, ", " HOST_WIDE_INT_PRINT_DEC "\n", size_); \
231 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME) \
234 fputs (SIZE_ASM_OP, STREAM); \
235 assemble_name (STREAM, NAME); \
236 fputs (", .-", STREAM); \
237 assemble_name (STREAM, NAME); \
238 putc ('\n', STREAM); \
245 /* This determines whether or not we support weak symbols. */
246 #ifndef SUPPORTS_WEAK
247 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
248 #define SUPPORTS_WEAK 1
250 #define SUPPORTS_WEAK 0
254 /* This determines whether or not we support the discriminator
255 attribute in the .loc directive. */
256 #ifndef SUPPORTS_DISCRIMINATOR
257 #ifdef HAVE_GAS_DISCRIMINATOR
258 #define SUPPORTS_DISCRIMINATOR 1
260 #define SUPPORTS_DISCRIMINATOR 0
264 /* This determines whether or not we support link-once semantics. */
265 #ifndef SUPPORTS_ONE_ONLY
266 #ifdef MAKE_DECL_ONE_ONLY
267 #define SUPPORTS_ONE_ONLY 1
269 #define SUPPORTS_ONE_ONLY 0
273 /* This determines whether weak symbols must be left out of a static
274 archive's table of contents. Defining this macro to be nonzero has
275 the consequence that certain symbols will not be made weak that
276 otherwise would be. The C++ ABI requires this macro to be zero;
277 see the documentation. */
278 #ifndef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
279 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 0
282 /* This determines whether or not we need linkonce unwind information. */
283 #ifndef TARGET_USES_WEAK_UNWIND_INFO
284 #define TARGET_USES_WEAK_UNWIND_INFO 0
287 /* By default, there is no prefix on user-defined symbols. */
288 #ifndef USER_LABEL_PREFIX
289 #define USER_LABEL_PREFIX ""
292 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
293 provide a weak attribute. Else define it to nothing.
295 This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
296 not available at that time.
298 Note, this is only for use by target files which we know are to be
300 #ifndef TARGET_ATTRIBUTE_WEAK
302 # define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
304 # define TARGET_ATTRIBUTE_WEAK
308 /* Determines whether we may use common symbols to represent one-only
309 semantics (a.k.a. "vague linkage"). */
310 #ifndef USE_COMMON_FOR_ONE_ONLY
311 # define USE_COMMON_FOR_ONE_ONLY 1
314 /* By default we can assume that all global symbols are in one namespace,
315 across all shared libraries. */
316 #ifndef MULTIPLE_SYMBOL_SPACES
317 # define MULTIPLE_SYMBOL_SPACES 0
320 /* If the target supports init_priority C++ attribute, give
321 SUPPORTS_INIT_PRIORITY a nonzero value. */
322 #ifndef SUPPORTS_INIT_PRIORITY
323 #define SUPPORTS_INIT_PRIORITY 1
324 #endif /* SUPPORTS_INIT_PRIORITY */
326 /* If duplicate library search directories can be removed from a
327 linker command without changing the linker's semantics, give this
329 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
330 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
331 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
333 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
334 the rest of the DWARF 2 frame unwind support is also provided. */
335 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX) \
336 && !defined (TARGET_UNWIND_INFO)
337 #define DWARF2_UNWIND_INFO 1
340 /* If we have named sections, and we're using crtstuff to run ctors,
341 use them for registering eh frame information. */
342 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
343 && !defined(EH_FRAME_IN_DATA_SECTION)
344 #ifndef EH_FRAME_SECTION_NAME
345 #define EH_FRAME_SECTION_NAME ".eh_frame"
349 /* On many systems, different EH table encodings are used under
350 difference circumstances. Some will require runtime relocations;
351 some will not. For those that do not require runtime relocations,
352 we would like to make the table read-only. However, since the
353 read-only tables may need to be combined with read-write tables
354 that do require runtime relocation, it is not safe to make the
355 tables read-only unless the linker will merge read-only and
356 read-write sections into a single read-write section. If your
357 linker does not have this ability, but your system is such that no
358 encoding used with non-PIC code will ever require a runtime
359 relocation, then you can define EH_TABLES_CAN_BE_READ_ONLY to 1 in
360 your target configuration file. */
361 #ifndef EH_TABLES_CAN_BE_READ_ONLY
362 #ifdef HAVE_LD_RO_RW_SECTION_MIXING
363 #define EH_TABLES_CAN_BE_READ_ONLY 1
365 #define EH_TABLES_CAN_BE_READ_ONLY 0
369 /* If we have named section and we support weak symbols, then use the
370 .jcr section for recording java classes which need to be registered
371 at program start-up time. */
372 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
373 #ifndef JCR_SECTION_NAME
374 #define JCR_SECTION_NAME ".jcr"
378 /* This decision to use a .jcr section can be overridden by defining
379 USE_JCR_SECTION to 0 in target file. This is necessary if target
380 can define JCR_SECTION_NAME but does not have crtstuff or
381 linker support for .jcr section. */
382 #ifndef TARGET_USE_JCR_SECTION
383 #ifdef JCR_SECTION_NAME
384 #define TARGET_USE_JCR_SECTION 1
386 #define TARGET_USE_JCR_SECTION 0
390 /* Number of hardware registers that go into the DWARF-2 unwind info.
391 If not defined, equals FIRST_PSEUDO_REGISTER */
393 #ifndef DWARF_FRAME_REGISTERS
394 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
397 /* How to renumber registers for dbx and gdb. If not defined, assume
398 no renumbering is necessary. */
400 #ifndef DBX_REGISTER_NUMBER
401 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
404 /* Default sizes for base C types. If the sizes are different for
405 your target, you should override these values by defining the
406 appropriate symbols in your tm.h file. */
408 #ifndef BITS_PER_UNIT
409 #define BITS_PER_UNIT 8
412 #ifndef BITS_PER_WORD
413 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
416 #ifndef CHAR_TYPE_SIZE
417 #define CHAR_TYPE_SIZE BITS_PER_UNIT
420 #ifndef BOOL_TYPE_SIZE
421 /* `bool' has size and alignment `1', on almost all platforms. */
422 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
425 #ifndef SHORT_TYPE_SIZE
426 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
429 #ifndef INT_TYPE_SIZE
430 #define INT_TYPE_SIZE BITS_PER_WORD
433 #ifndef LONG_TYPE_SIZE
434 #define LONG_TYPE_SIZE BITS_PER_WORD
437 #ifndef LONG_LONG_TYPE_SIZE
438 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
441 #ifndef WCHAR_TYPE_SIZE
442 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
445 #ifndef FLOAT_TYPE_SIZE
446 #define FLOAT_TYPE_SIZE BITS_PER_WORD
449 #ifndef DOUBLE_TYPE_SIZE
450 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
453 #ifndef LONG_DOUBLE_TYPE_SIZE
454 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
457 #ifndef DECIMAL32_TYPE_SIZE
458 #define DECIMAL32_TYPE_SIZE 32
461 #ifndef DECIMAL64_TYPE_SIZE
462 #define DECIMAL64_TYPE_SIZE 64
465 #ifndef DECIMAL128_TYPE_SIZE
466 #define DECIMAL128_TYPE_SIZE 128
469 #ifndef SHORT_FRACT_TYPE_SIZE
470 #define SHORT_FRACT_TYPE_SIZE BITS_PER_UNIT
473 #ifndef FRACT_TYPE_SIZE
474 #define FRACT_TYPE_SIZE (BITS_PER_UNIT * 2)
477 #ifndef LONG_FRACT_TYPE_SIZE
478 #define LONG_FRACT_TYPE_SIZE (BITS_PER_UNIT * 4)
481 #ifndef LONG_LONG_FRACT_TYPE_SIZE
482 #define LONG_LONG_FRACT_TYPE_SIZE (BITS_PER_UNIT * 8)
485 #ifndef SHORT_ACCUM_TYPE_SIZE
486 #define SHORT_ACCUM_TYPE_SIZE (SHORT_FRACT_TYPE_SIZE * 2)
489 #ifndef ACCUM_TYPE_SIZE
490 #define ACCUM_TYPE_SIZE (FRACT_TYPE_SIZE * 2)
493 #ifndef LONG_ACCUM_TYPE_SIZE
494 #define LONG_ACCUM_TYPE_SIZE (LONG_FRACT_TYPE_SIZE * 2)
497 #ifndef LONG_LONG_ACCUM_TYPE_SIZE
498 #define LONG_LONG_ACCUM_TYPE_SIZE (LONG_LONG_FRACT_TYPE_SIZE * 2)
501 /* We let tm.h override the types used here, to handle trivial differences
502 such as the choice of unsigned int or long unsigned int for size_t.
503 When machines start needing nontrivial differences in the size type,
504 it would be best to do something here to figure out automatically
505 from other information what type to use. */
508 #define SIZE_TYPE "long unsigned int"
512 #define PID_TYPE "int"
515 /* If GCC knows the exact uint_least16_t and uint_least32_t types from
516 <stdint.h>, use them for char16_t and char32_t. Otherwise, use
517 these guesses; getting the wrong type of a given width will not
518 affect C++ name mangling because in C++ these are distinct types
521 #ifdef UINT_LEAST16_TYPE
522 #define CHAR16_TYPE UINT_LEAST16_TYPE
524 #define CHAR16_TYPE "short unsigned int"
527 #ifdef UINT_LEAST32_TYPE
528 #define CHAR32_TYPE UINT_LEAST32_TYPE
530 #define CHAR32_TYPE "unsigned int"
534 #define WCHAR_TYPE "int"
537 /* WCHAR_TYPE gets overridden by -fshort-wchar. */
538 #define MODIFIED_WCHAR_TYPE \
539 (flag_short_wchar ? "short unsigned int" : WCHAR_TYPE)
542 #define PTRDIFF_TYPE "long int"
546 #define WINT_TYPE "unsigned int"
550 #define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
552 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
558 #define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
560 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
561 ? "long unsigned int" \
562 : "long long unsigned int"))
566 /* There are no default definitions of these <stdint.h> types. */
568 #ifndef SIG_ATOMIC_TYPE
569 #define SIG_ATOMIC_TYPE ((const char *) NULL)
573 #define INT8_TYPE ((const char *) NULL)
577 #define INT16_TYPE ((const char *) NULL)
581 #define INT32_TYPE ((const char *) NULL)
585 #define INT64_TYPE ((const char *) NULL)
589 #define UINT8_TYPE ((const char *) NULL)
593 #define UINT16_TYPE ((const char *) NULL)
597 #define UINT32_TYPE ((const char *) NULL)
601 #define UINT64_TYPE ((const char *) NULL)
604 #ifndef INT_LEAST8_TYPE
605 #define INT_LEAST8_TYPE ((const char *) NULL)
608 #ifndef INT_LEAST16_TYPE
609 #define INT_LEAST16_TYPE ((const char *) NULL)
612 #ifndef INT_LEAST32_TYPE
613 #define INT_LEAST32_TYPE ((const char *) NULL)
616 #ifndef INT_LEAST64_TYPE
617 #define INT_LEAST64_TYPE ((const char *) NULL)
620 #ifndef UINT_LEAST8_TYPE
621 #define UINT_LEAST8_TYPE ((const char *) NULL)
624 #ifndef UINT_LEAST16_TYPE
625 #define UINT_LEAST16_TYPE ((const char *) NULL)
628 #ifndef UINT_LEAST32_TYPE
629 #define UINT_LEAST32_TYPE ((const char *) NULL)
632 #ifndef UINT_LEAST64_TYPE
633 #define UINT_LEAST64_TYPE ((const char *) NULL)
636 #ifndef INT_FAST8_TYPE
637 #define INT_FAST8_TYPE ((const char *) NULL)
640 #ifndef INT_FAST16_TYPE
641 #define INT_FAST16_TYPE ((const char *) NULL)
644 #ifndef INT_FAST32_TYPE
645 #define INT_FAST32_TYPE ((const char *) NULL)
648 #ifndef INT_FAST64_TYPE
649 #define INT_FAST64_TYPE ((const char *) NULL)
652 #ifndef UINT_FAST8_TYPE
653 #define UINT_FAST8_TYPE ((const char *) NULL)
656 #ifndef UINT_FAST16_TYPE
657 #define UINT_FAST16_TYPE ((const char *) NULL)
660 #ifndef UINT_FAST32_TYPE
661 #define UINT_FAST32_TYPE ((const char *) NULL)
664 #ifndef UINT_FAST64_TYPE
665 #define UINT_FAST64_TYPE ((const char *) NULL)
669 #define INTPTR_TYPE ((const char *) NULL)
673 #define UINTPTR_TYPE ((const char *) NULL)
676 /* Width in bits of a pointer. Mind the value of the macro `Pmode'. */
678 #define POINTER_SIZE BITS_PER_WORD
681 #ifndef PIC_OFFSET_TABLE_REGNUM
682 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
685 #ifndef TARGET_DLLIMPORT_DECL_ATTRIBUTES
686 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 0
689 #ifndef TARGET_DECLSPEC
690 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
691 /* If the target supports the "dllimport" attribute, users are
692 probably used to the "__declspec" syntax. */
693 #define TARGET_DECLSPEC 1
695 #define TARGET_DECLSPEC 0
699 /* By default, the preprocessor should be invoked the same way in C++
701 #ifndef CPLUSPLUS_CPP_SPEC
703 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
707 #ifndef ACCUMULATE_OUTGOING_ARGS
708 #define ACCUMULATE_OUTGOING_ARGS 0
711 /* Supply a default definition for PUSH_ARGS. */
714 #define PUSH_ARGS !ACCUMULATE_OUTGOING_ARGS
720 /* Decide whether a function's arguments should be processed
721 from first to last or from last to first.
723 They should if the stack and args grow in opposite directions, but
724 only if we have push insns. */
728 #ifndef PUSH_ARGS_REVERSED
729 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
730 #define PUSH_ARGS_REVERSED PUSH_ARGS
736 #ifndef PUSH_ARGS_REVERSED
737 #define PUSH_ARGS_REVERSED 0
740 /* Default value for the alignment (in bits) a C conformant malloc has to
741 provide. This default is intended to be safe and always correct. */
742 #ifndef MALLOC_ABI_ALIGNMENT
743 #define MALLOC_ABI_ALIGNMENT BITS_PER_WORD
746 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
747 STACK_BOUNDARY is required. */
748 #ifndef PREFERRED_STACK_BOUNDARY
749 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
752 /* Set INCOMING_STACK_BOUNDARY to PREFERRED_STACK_BOUNDARY if it is not
754 #ifndef INCOMING_STACK_BOUNDARY
755 #define INCOMING_STACK_BOUNDARY PREFERRED_STACK_BOUNDARY
758 #ifndef TARGET_DEFAULT_PACK_STRUCT
759 #define TARGET_DEFAULT_PACK_STRUCT 0
762 /* By default, the C++ compiler will use function addresses in the
763 vtable entries. Setting this nonzero tells the compiler to use
764 function descriptors instead. The value of this macro says how
765 many words wide the descriptor is (normally 2). It is assumed
766 that the address of a function descriptor may be treated as a
767 pointer to a function. */
768 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
769 #define TARGET_VTABLE_USES_DESCRIPTORS 0
772 /* By default, the vtable entries are void pointers, the so the alignment
773 is the same as pointer alignment. The value of this macro specifies
774 the alignment of the vtable entry in bits. It should be defined only
775 when special alignment is necessary. */
776 #ifndef TARGET_VTABLE_ENTRY_ALIGN
777 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
780 /* There are a few non-descriptor entries in the vtable at offsets below
781 zero. If these entries must be padded (say, to preserve the alignment
782 specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
783 words in each data entry. */
784 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
785 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
788 /* Decide whether it is safe to use a local alias for a virtual function
789 when constructing thunks. */
790 #ifndef TARGET_USE_LOCAL_THUNK_ALIAS_P
791 #ifdef ASM_OUTPUT_DEF
792 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 1
794 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 0
798 /* Select a format to encode pointers in exception handling data. We
799 prefer those that result in fewer dynamic relocations. Assume no
800 special support here and encode direct references. */
801 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
802 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) DW_EH_PE_absptr
805 /* By default, the C++ compiler will use the lowest bit of the pointer
806 to function to indicate a pointer-to-member-function points to a
807 virtual member function. However, if FUNCTION_BOUNDARY indicates
808 function addresses aren't always even, the lowest bit of the delta
809 field will be used. */
810 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
811 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
812 (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
813 ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
816 #ifndef DEFAULT_GDB_EXTENSIONS
817 #define DEFAULT_GDB_EXTENSIONS 1
820 /* If more than one debugging type is supported, you must define
821 PREFERRED_DEBUGGING_TYPE to choose the default. */
823 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) \
824 + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) \
825 + defined (VMS_DEBUGGING_INFO))
826 #ifndef PREFERRED_DEBUGGING_TYPE
827 #error You must define PREFERRED_DEBUGGING_TYPE
828 #endif /* no PREFERRED_DEBUGGING_TYPE */
830 /* If only one debugging format is supported, define PREFERRED_DEBUGGING_TYPE
831 here so other code needn't care. */
832 #elif defined DBX_DEBUGGING_INFO
833 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
835 #elif defined SDB_DEBUGGING_INFO
836 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
838 #elif defined DWARF2_DEBUGGING_INFO
839 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
841 #elif defined VMS_DEBUGGING_INFO
842 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
844 #elif defined XCOFF_DEBUGGING_INFO
845 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
848 /* No debugging format is supported by this target. */
849 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
852 #ifndef LARGEST_EXPONENT_IS_NORMAL
853 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
856 #ifndef ROUND_TOWARDS_ZERO
857 #define ROUND_TOWARDS_ZERO 0
860 #ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
861 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
864 /* True if the targets integer-comparison functions return { 0, 1, 2
865 } to indicate { <, ==, > }. False if { -1, 0, 1 } is used
866 instead. The libgcc routines are biased. */
867 #ifndef TARGET_LIB_INT_CMP_BIASED
868 #define TARGET_LIB_INT_CMP_BIASED (true)
871 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
872 then the word-endianness is the same as for integers. */
873 #ifndef FLOAT_WORDS_BIG_ENDIAN
874 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
877 #ifdef TARGET_FLT_EVAL_METHOD
878 #define TARGET_FLT_EVAL_METHOD_NON_DEFAULT 1
880 #define TARGET_FLT_EVAL_METHOD 0
881 #define TARGET_FLT_EVAL_METHOD_NON_DEFAULT 0
884 #ifndef TARGET_DEC_EVAL_METHOD
885 #define TARGET_DEC_EVAL_METHOD 2
888 #ifndef HOT_TEXT_SECTION_NAME
889 #define HOT_TEXT_SECTION_NAME ".text.hot"
892 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
893 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
896 #ifndef HAS_LONG_COND_BRANCH
897 #define HAS_LONG_COND_BRANCH 0
900 #ifndef HAS_LONG_UNCOND_BRANCH
901 #define HAS_LONG_UNCOND_BRANCH 0
904 /* By default, only attempt to parallelize bitwise operations, and
905 possibly adds/subtracts using bit-twiddling. */
906 #ifndef UNITS_PER_SIMD_WORD
907 #define UNITS_PER_SIMD_WORD(MODE) UNITS_PER_WORD
910 /* Determine whether __cxa_atexit, rather than atexit, is used to
911 register C++ destructors for local statics and global objects. */
912 #ifndef DEFAULT_USE_CXA_ATEXIT
913 #define DEFAULT_USE_CXA_ATEXIT 0
916 /* If none of these macros are defined, the port must use the new
917 technique of defining constraints in the machine description.
918 tm_p.h will define those macros that machine-independent code
920 #if !defined CONSTRAINT_LEN \
921 && !defined REG_CLASS_FROM_LETTER \
922 && !defined REG_CLASS_FROM_CONSTRAINT \
923 && !defined CONST_OK_FOR_LETTER_P \
924 && !defined CONST_OK_FOR_CONSTRAINT_P \
925 && !defined CONST_DOUBLE_OK_FOR_LETTER_P \
926 && !defined CONST_DOUBLE_OK_FOR_CONSTRAINT_P \
927 && !defined EXTRA_CONSTRAINT \
928 && !defined EXTRA_CONSTRAINT_STR \
929 && !defined EXTRA_MEMORY_CONSTRAINT \
930 && !defined EXTRA_ADDRESS_CONSTRAINT
932 #define USE_MD_CONSTRAINTS
934 #if GCC_VERSION >= 3000 && defined IN_GCC
935 /* These old constraint macros shouldn't appear anywhere in a
936 configuration using MD constraint definitions. */
937 #pragma GCC poison REG_CLASS_FROM_LETTER CONST_OK_FOR_LETTER_P \
938 CONST_DOUBLE_OK_FOR_LETTER_P EXTRA_CONSTRAINT
941 #else /* old constraint mechanism in use */
943 /* Determine whether extra constraint letter should be handled
944 via address reload (like 'o'). */
945 #ifndef EXTRA_MEMORY_CONSTRAINT
946 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
949 /* Determine whether extra constraint letter should be handled
950 as an address (like 'p'). */
951 #ifndef EXTRA_ADDRESS_CONSTRAINT
952 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
955 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
956 for all the characters that it does not want to change, so things like the
957 'length' of a digit in a matching constraint is an implementation detail,
958 and not part of the interface. */
959 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
961 #ifndef CONSTRAINT_LEN
962 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
965 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
966 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
969 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
970 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
971 CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
974 #ifndef REG_CLASS_FROM_CONSTRAINT
975 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
978 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
979 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
982 #endif /* old constraint mechanism in use */
984 #ifndef REGISTER_MOVE_COST
985 #define REGISTER_MOVE_COST(m, x, y) 2
988 /* Determine whether the entire c99 runtime
989 is present in the runtime library. */
990 #ifndef TARGET_C99_FUNCTIONS
991 #define TARGET_C99_FUNCTIONS 0
994 /* Determine whether the target runtime library has
995 a sincos implementation following the GNU extension. */
996 #ifndef TARGET_HAS_SINCOS
997 #define TARGET_HAS_SINCOS 0
1000 /* Indicate that CLZ and CTZ are undefined at zero. */
1001 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
1002 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) 0
1004 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
1005 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) 0
1008 /* Provide a default value for STORE_FLAG_VALUE. */
1009 #ifndef STORE_FLAG_VALUE
1010 #define STORE_FLAG_VALUE 1
1013 /* This macro is used to determine what the largest unit size that
1014 move_by_pieces can use is. */
1016 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
1017 move efficiently, as opposed to MOVE_MAX which is the maximum
1018 number of bytes we can move with a single instruction. */
1020 #ifndef MOVE_MAX_PIECES
1021 #define MOVE_MAX_PIECES MOVE_MAX
1024 #ifndef STACK_POINTER_OFFSET
1025 #define STACK_POINTER_OFFSET 0
1029 #define LOCAL_REGNO(REGNO) 0
1032 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
1033 the stack pointer does not matter. The value is tested only in
1034 functions that have frame pointers. */
1035 #ifndef EXIT_IGNORE_STACK
1036 #define EXIT_IGNORE_STACK 0
1039 /* Assume that case vectors are not pc-relative. */
1040 #ifndef CASE_VECTOR_PC_RELATIVE
1041 #define CASE_VECTOR_PC_RELATIVE 0
1044 /* Assume that trampolines need function alignment. */
1045 #ifndef TRAMPOLINE_ALIGNMENT
1046 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
1049 /* Register mappings for target machines without register windows. */
1050 #ifndef INCOMING_REGNO
1051 #define INCOMING_REGNO(N) (N)
1054 #ifndef OUTGOING_REGNO
1055 #define OUTGOING_REGNO(N) (N)
1058 #ifndef SHIFT_COUNT_TRUNCATED
1059 #define SHIFT_COUNT_TRUNCATED 0
1062 #ifndef LEGITIMATE_PIC_OPERAND_P
1063 #define LEGITIMATE_PIC_OPERAND_P(X) 1
1066 #ifndef TARGET_MEM_CONSTRAINT
1067 #define TARGET_MEM_CONSTRAINT 'm'
1070 #ifndef REVERSIBLE_CC_MODE
1071 #define REVERSIBLE_CC_MODE(MODE) 0
1074 /* Biggest alignment supported by the object file format of this machine. */
1075 #ifndef MAX_OFILE_ALIGNMENT
1076 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
1079 #ifndef FRAME_GROWS_DOWNWARD
1080 #define FRAME_GROWS_DOWNWARD 0
1083 /* On most machines, the CFA coincides with the first incoming parm. */
1084 #ifndef ARG_POINTER_CFA_OFFSET
1085 #define ARG_POINTER_CFA_OFFSET(FNDECL) \
1086 (FIRST_PARM_OFFSET (FNDECL) + crtl->args.pretend_args_size)
1089 /* On most machines, we use the CFA as DW_AT_frame_base. */
1090 #ifndef CFA_FRAME_BASE_OFFSET
1091 #define CFA_FRAME_BASE_OFFSET(FNDECL) 0
1094 /* The offset from the incoming value of %sp to the top of the stack frame
1095 for the current function. */
1096 #ifndef INCOMING_FRAME_SP_OFFSET
1097 #define INCOMING_FRAME_SP_OFFSET 0
1100 #ifndef HARD_REGNO_NREGS_HAS_PADDING
1101 #define HARD_REGNO_NREGS_HAS_PADDING(REGNO, MODE) 0
1102 #define HARD_REGNO_NREGS_WITH_PADDING(REGNO, MODE) -1
1105 #ifndef OUTGOING_REG_PARM_STACK_SPACE
1106 #define OUTGOING_REG_PARM_STACK_SPACE(FNTYPE) 0
1109 /* MAX_STACK_ALIGNMENT is the maximum stack alignment guaranteed by
1110 the backend. MAX_SUPPORTED_STACK_ALIGNMENT is the maximum best
1111 effort stack alignment supported by the backend. If the backend
1112 supports stack alignment, MAX_SUPPORTED_STACK_ALIGNMENT and
1113 MAX_STACK_ALIGNMENT are the same. Otherwise, the incoming stack
1114 boundary will limit the maximum guaranteed stack alignment. */
1115 #ifdef MAX_STACK_ALIGNMENT
1116 #define MAX_SUPPORTED_STACK_ALIGNMENT MAX_STACK_ALIGNMENT
1118 #define MAX_STACK_ALIGNMENT STACK_BOUNDARY
1119 #define MAX_SUPPORTED_STACK_ALIGNMENT PREFERRED_STACK_BOUNDARY
1122 #define SUPPORTS_STACK_ALIGNMENT (MAX_STACK_ALIGNMENT > STACK_BOUNDARY)
1124 #ifndef LOCAL_ALIGNMENT
1125 #define LOCAL_ALIGNMENT(TYPE, ALIGNMENT) ALIGNMENT
1128 #ifndef STACK_SLOT_ALIGNMENT
1129 #define STACK_SLOT_ALIGNMENT(TYPE,MODE,ALIGN) \
1130 ((TYPE) ? LOCAL_ALIGNMENT ((TYPE), (ALIGN)) : (ALIGN))
1133 #ifndef LOCAL_DECL_ALIGNMENT
1134 #define LOCAL_DECL_ALIGNMENT(DECL) \
1135 LOCAL_ALIGNMENT (TREE_TYPE (DECL), DECL_ALIGN (DECL))
1138 #ifndef MINIMUM_ALIGNMENT
1139 #define MINIMUM_ALIGNMENT(EXP,MODE,ALIGN) (ALIGN)
1142 /* Alignment value for attribute ((aligned)). */
1143 #ifndef ATTRIBUTE_ALIGNED_VALUE
1144 #define ATTRIBUTE_ALIGNED_VALUE BIGGEST_ALIGNMENT
1147 /* Many ports have no mode-dependent addresses (except possibly autoincrement
1148 and autodecrement addresses, which are handled by target-independent code
1150 #ifndef GO_IF_MODE_DEPENDENT_ADDRESS
1151 #define GO_IF_MODE_DEPENDENT_ADDRESS(X, WIN)
1154 /* For most ports anything that evaluates to a constant symbolic
1155 or integer value is acceptable as a constant address. */
1156 #ifndef CONSTANT_ADDRESS_P
1157 #define CONSTANT_ADDRESS_P(X) (CONSTANT_P (X) && GET_CODE (X) != CONST_DOUBLE)
1160 #ifndef MAX_FIXED_MODE_SIZE
1161 #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode)
1164 /* Nonzero if structures and unions should be returned in memory.
1166 This should only be defined if compatibility with another compiler or
1167 with an ABI is needed, because it results in slower code. */
1169 #ifndef DEFAULT_PCC_STRUCT_RETURN
1170 #define DEFAULT_PCC_STRUCT_RETURN 1
1173 #ifdef GCC_INSN_FLAGS_H
1174 /* Dependent default target macro definitions
1176 This section of defaults.h defines target macros that depend on generated
1177 headers. This is a bit awkward: We want to put all default definitions
1178 for target macros in defaults.h, but some of the defaults depend on the
1179 HAVE_* flags defines of insn-flags.h. But insn-flags.h is not always
1180 included by files that do include defaults.h.
1182 Fortunately, the default macro definitions that depend on the HAVE_*
1183 macros are also the ones that will only be used inside GCC itself, i.e.
1184 not in the gen* programs or in target objects like libgcc.
1186 Obviously, it would be best to keep this section of defaults.h as small
1187 as possible, by converting the macros defined below to target hooks or
1191 /* Just because the user configured --with-sjlj-exceptions=no doesn't
1192 mean that we can use call frame exceptions. Detect that the target
1193 has appropriate support. */
1195 #ifndef MUST_USE_SJLJ_EXCEPTIONS
1196 # if defined (EH_RETURN_DATA_REGNO) \
1197 && (defined (TARGET_UNWIND_INFO) \
1198 || (DWARF2_UNWIND_INFO \
1199 && (defined (EH_RETURN_HANDLER_RTX) \
1200 || defined (HAVE_eh_return))))
1201 # define MUST_USE_SJLJ_EXCEPTIONS 0
1203 # define MUST_USE_SJLJ_EXCEPTIONS 1
1207 #ifdef CONFIG_SJLJ_EXCEPTIONS
1208 # if CONFIG_SJLJ_EXCEPTIONS == 1
1209 # define USING_SJLJ_EXCEPTIONS 1
1211 # if CONFIG_SJLJ_EXCEPTIONS == 0
1212 # define USING_SJLJ_EXCEPTIONS 0
1213 # if !defined(EH_RETURN_DATA_REGNO)
1214 #error "EH_RETURN_DATA_REGNO required"
1216 # if ! (defined(TARGET_UNWIND_INFO) || DWARF2_UNWIND_INFO)
1217 #error "{DWARF2,TARGET}_UNWIND_INFO required"
1219 # if !defined(TARGET_UNWIND_INFO) \
1220 && !(defined(EH_RETURN_HANDLER_RTX) || defined(HAVE_eh_return))
1221 #error "EH_RETURN_HANDLER_RTX or eh_return required"
1223 /* Usually the above error checks will have already triggered an
1224 error, but backends may set MUST_USE_SJLJ_EXCEPTIONS for their own
1226 # if MUST_USE_SJLJ_EXCEPTIONS
1227 #error "Must use SJLJ exceptions but configured not to"
1231 # define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS
1234 /* The default branch cost is 1. */
1236 #define BRANCH_COST(speed_p, predictable_p) 1
1239 /* If a memory-to-memory move would take MOVE_RATIO or more simple
1240 move-instruction sequences, we will do a movmem or libcall instead. */
1243 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1244 #define MOVE_RATIO(speed) 2
1246 /* If we are optimizing for space (-Os), cut down the default move ratio. */
1247 #define MOVE_RATIO(speed) ((speed) ? 15 : 3)
1251 /* If a clear memory operation would take CLEAR_RATIO or more simple
1252 move-instruction sequences, we will do a setmem or libcall instead. */
1255 #if defined (HAVE_setmemqi) || defined (HAVE_setmemhi) || defined (HAVE_setmemsi) || defined (HAVE_setmemdi) || defined (HAVE_setmemti)
1256 #define CLEAR_RATIO(speed) 2
1258 /* If we are optimizing for space, cut down the default clear ratio. */
1259 #define CLEAR_RATIO(speed) ((speed) ? 15 :3)
1263 /* If a memory set (to value other than zero) operation would take
1264 SET_RATIO or more simple move-instruction sequences, we will do a movmem
1265 or libcall instead. */
1267 #define SET_RATIO(speed) MOVE_RATIO(speed)
1270 /* Supply a default definition for FUNCTION_ARG_PADDING:
1271 usually pad upward, but pad short args downward on
1272 big-endian machines. */
1274 #define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \
1275 (! BYTES_BIG_ENDIAN \
1277 : (((MODE) == BLKmode \
1278 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
1279 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
1280 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
1281 ? downward : upward))
1283 #ifndef FUNCTION_ARG_PADDING
1284 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
1285 DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE))
1288 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
1289 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
1292 #ifndef FUNCTION_ARG_BOUNDARY
1293 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
1296 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
1297 Normally move_insn, so Pmode stack pointer. */
1299 #ifndef STACK_SAVEAREA_MODE
1300 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
1303 /* Supply a default definition of STACK_SIZE_MODE for
1304 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
1306 #ifndef STACK_SIZE_MODE
1307 #define STACK_SIZE_MODE word_mode
1310 /* Provide default values for the macros controlling stack checking. */
1312 /* The default is neither full builtin stack checking... */
1313 #ifndef STACK_CHECK_BUILTIN
1314 #define STACK_CHECK_BUILTIN 0
1317 /* ...nor static builtin stack checking. */
1318 #ifndef STACK_CHECK_STATIC_BUILTIN
1319 #define STACK_CHECK_STATIC_BUILTIN 0
1322 /* The default interval is one page (4096 bytes). */
1323 #ifndef STACK_CHECK_PROBE_INTERVAL_EXP
1324 #define STACK_CHECK_PROBE_INTERVAL_EXP 12
1327 /* The default is not to move the stack pointer. */
1328 #ifndef STACK_CHECK_MOVING_SP
1329 #define STACK_CHECK_MOVING_SP 0
1332 /* This is a kludge to try to capture the discrepancy between the old
1333 mechanism (generic stack checking) and the new mechanism (static
1334 builtin stack checking). STACK_CHECK_PROTECT needs to be bumped
1335 for the latter because part of the protection area is effectively
1336 included in STACK_CHECK_MAX_FRAME_SIZE for the former. */
1337 #ifdef STACK_CHECK_PROTECT
1338 #define STACK_OLD_CHECK_PROTECT STACK_CHECK_PROTECT
1340 #define STACK_OLD_CHECK_PROTECT \
1341 (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 8 * 1024)
1344 /* Minimum amount of stack required to recover from an anticipated stack
1345 overflow detection. The default value conveys an estimate of the amount
1346 of stack required to propagate an exception. */
1347 #ifndef STACK_CHECK_PROTECT
1348 #define STACK_CHECK_PROTECT \
1349 (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 12 * 1024)
1352 /* Make the maximum frame size be the largest we can and still only need
1353 one probe per function. */
1354 #ifndef STACK_CHECK_MAX_FRAME_SIZE
1355 #define STACK_CHECK_MAX_FRAME_SIZE \
1356 ((1 << STACK_CHECK_PROBE_INTERVAL_EXP) - UNITS_PER_WORD)
1359 /* This is arbitrary, but should be large enough everywhere. */
1360 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
1361 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
1364 /* Provide a reasonable default for the maximum size of an object to
1365 allocate in the fixed frame. We may need to be able to make this
1366 controllable by the user at some point. */
1367 #ifndef STACK_CHECK_MAX_VAR_SIZE
1368 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
1371 #endif /* GCC_INSN_FLAGS_H */
1373 #endif /* ! GCC_DEFAULTS_H */