GCC Middle and Back End API Reference
defaults.h
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1/* Definitions of various defaults for tm.h macros.
2 Copyright (C) 1992-2025 Free Software Foundation, Inc.
3 Contributed by Ron Guilmette (rfg@monkeys.com)
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 3, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15for more details.
16
17Under Section 7 of GPL version 3, you are granted additional
18permissions described in the GCC Runtime Library Exception, version
193.1, as published by the Free Software Foundation.
20
21You should have received a copy of the GNU General Public License and
22a copy of the GCC Runtime Library Exception along with this program;
23see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24<http://www.gnu.org/licenses/>. */
25
26#ifndef GCC_DEFAULTS_H
27#define GCC_DEFAULTS_H
28
29/* How to start an assembler comment. */
30#ifndef ASM_COMMENT_START
31#define ASM_COMMENT_START ";#"
32#endif
33
34/* Store in OUTPUT a string (made with alloca) containing an
35 assembler-name for a local static variable or function named NAME.
36 LABELNO is an integer which is different for each call. */
37
38#ifndef ASM_PN_FORMAT
39# ifndef NO_DOT_IN_LABEL
40# define ASM_PN_FORMAT "%s.%lu"
41# else
42# ifndef NO_DOLLAR_IN_LABEL
43# define ASM_PN_FORMAT "%s$%lu"
44# else
45# define ASM_PN_FORMAT "__%s_%lu"
46# endif
47# endif
48#endif /* ! ASM_PN_FORMAT */
49
50#ifndef ASM_FORMAT_PRIVATE_NAME
51# define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
52 do { const char *const name_ = (NAME); \
53 char *const output_ = (OUTPUT) = \
54 (char *) alloca (strlen (name_) + 32); \
55 sprintf (output_, ASM_PN_FORMAT, name_, (unsigned long)(LABELNO)); \
56 } while (0)
57#endif
58
59/* Choose a reasonable default for ASM_OUTPUT_ASCII. */
60
61#ifndef ASM_OUTPUT_ASCII
62#define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
63 do { \
64 FILE *_my_file = (MYFILE); \
65 const unsigned char *_hide_p = (const unsigned char *) (MYSTRING); \
66 int _hide_thissize = (MYLENGTH); \
67 { \
68 const unsigned char *p = _hide_p; \
69 int thissize = _hide_thissize; \
70 int i; \
71 fprintf (_my_file, "\t.ascii \""); \
72 \
73 for (i = 0; i < thissize; i++) \
74 { \
75 int c = p[i]; \
76 if (c == '\"' || c == '\\') \
77 putc ('\\', _my_file); \
78 if (ISPRINT (c)) \
79 putc (c, _my_file); \
80 else \
81 { \
82 fprintf (_my_file, "\\%o", c); \
83 /* After an octal-escape, if a digit follows, \
84 terminate one string constant and start another. \
85 The VAX assembler fails to stop reading the escape \
86 after three digits, so this is the only way we \
87 can get it to parse the data properly. */ \
88 if (i < thissize - 1 && ISDIGIT (p[i + 1])) \
89 fprintf (_my_file, "\"\n\t.ascii \""); \
90 } \
91 } \
92 fprintf (_my_file, "\"\n"); \
93 } \
94 } \
95 while (0)
96#endif
97
98/* This is how we tell the assembler to equate two values. */
99#ifdef SET_ASM_OP
100#ifndef ASM_OUTPUT_DEF
101#define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
102 do { fprintf ((FILE), "%s", SET_ASM_OP); \
103 assemble_name (FILE, LABEL1); \
104 fprintf (FILE, ","); \
105 assemble_name (FILE, LABEL2); \
106 fprintf (FILE, "\n"); \
107 } while (0)
108#endif
109#endif
110
111#ifndef IFUNC_ASM_TYPE
112#define IFUNC_ASM_TYPE "gnu_indirect_function"
113#endif
114
115#ifndef TLS_COMMON_ASM_OP
116#define TLS_COMMON_ASM_OP ".tls_common"
117#endif
118
119#if defined (HAVE_AS_TLS) && !defined (ASM_OUTPUT_TLS_COMMON)
120#define ASM_OUTPUT_TLS_COMMON(FILE, DECL, NAME, SIZE) \
121 do \
122 { \
123 fprintf ((FILE), "\t%s\t", TLS_COMMON_ASM_OP); \
124 assemble_name ((FILE), (NAME)); \
125 fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
126 (SIZE), DECL_ALIGN (DECL) / BITS_PER_UNIT); \
127 } \
128 while (0)
129#endif
130
131/* Decide whether to defer emitting the assembler output for an equate
132 of two values. The default is to not defer output. */
133#ifndef TARGET_DEFERRED_OUTPUT_DEFS
134#define TARGET_DEFERRED_OUTPUT_DEFS(DECL,TARGET) false
135#endif
136
137/* This is how to output the definition of a user-level label named
138 NAME, such as the label on variable NAME. */
139
140#ifndef ASM_OUTPUT_LABEL
141#define ASM_OUTPUT_LABEL(FILE,NAME) \
142 do { \
143 assemble_name ((FILE), (NAME)); \
144 fputs (":\n", (FILE)); \
145 } while (0)
146#endif
147
148/* This is how to output the definition of a user-level label named
149 NAME, such as the label on a function. */
150
151#ifndef ASM_OUTPUT_FUNCTION_LABEL
152#define ASM_OUTPUT_FUNCTION_LABEL(FILE, NAME, DECL) \
153 assemble_function_label_raw ((FILE), (NAME))
154#endif
155
156/* Output the definition of a compiler-generated label named NAME. */
157#ifndef ASM_OUTPUT_INTERNAL_LABEL
158#define ASM_OUTPUT_INTERNAL_LABEL(FILE,NAME) \
159 do { \
160 assemble_name_raw ((FILE), (NAME)); \
161 fputs (":\n", (FILE)); \
162 } while (0)
163#endif
164
165/* This is how to output a reference to a user-level label named NAME. */
166
167#ifndef ASM_OUTPUT_LABELREF
168#define ASM_OUTPUT_LABELREF(FILE,NAME) \
169 do { \
170 fputs (user_label_prefix, (FILE)); \
171 fputs ((NAME), (FILE)); \
172 } while (0)
173#endif
174
175/* Allow target to print debug info labels specially. This is useful for
176 VLIW targets, since debug info labels should go into the middle of
177 instruction bundles instead of breaking them. */
178
179#ifndef ASM_OUTPUT_DEBUG_LABEL
180#define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
181 (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
182#endif
183
184/* This is how we tell the assembler that a symbol is weak. */
185#ifndef ASM_OUTPUT_WEAK_ALIAS
186#if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
187#define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE) \
188 do \
189 { \
190 ASM_WEAKEN_LABEL (STREAM, NAME); \
191 if (VALUE) \
192 ASM_OUTPUT_DEF (STREAM, NAME, VALUE); \
193 } \
194 while (0)
195#endif
196#endif
197
198/* This is how we tell the assembler that a symbol is a weak alias to
199 another symbol that doesn't require the other symbol to be defined.
200 Uses of the former will turn into weak uses of the latter, i.e.,
201 uses that, in case the latter is undefined, will not cause errors,
202 and will add it to the symbol table as weak undefined. However, if
203 the latter is referenced directly, a strong reference prevails. */
204#ifndef ASM_OUTPUT_WEAKREF
205#if defined HAVE_GAS_WEAKREF
206#define ASM_OUTPUT_WEAKREF(FILE, DECL, NAME, VALUE) \
207 do \
208 { \
209 fprintf ((FILE), "\t.weakref\t"); \
210 assemble_name ((FILE), (NAME)); \
211 fprintf ((FILE), ","); \
212 assemble_name ((FILE), (VALUE)); \
213 fprintf ((FILE), "\n"); \
214 } \
215 while (0)
216#endif
217#endif
218
219/* How to emit a .type directive. */
220#ifndef ASM_OUTPUT_TYPE_DIRECTIVE
221#if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
222#define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE) \
223 do \
224 { \
225 fputs (TYPE_ASM_OP, STREAM); \
226 assemble_name (STREAM, NAME); \
227 fputs (", ", STREAM); \
228 fprintf (STREAM, TYPE_OPERAND_FMT, TYPE); \
229 putc ('\n', STREAM); \
230 } \
231 while (0)
232#endif
233#endif
234
235/* How to emit a .size directive. */
236#ifndef ASM_OUTPUT_SIZE_DIRECTIVE
237#ifdef SIZE_ASM_OP
238#define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE) \
239 do \
240 { \
241 HOST_WIDE_INT size_ = (SIZE); \
242 fputs (SIZE_ASM_OP, STREAM); \
243 assemble_name (STREAM, NAME); \
244 fprintf (STREAM, ", " HOST_WIDE_INT_PRINT_DEC "\n", size_); \
245 } \
246 while (0)
247
248#define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME) \
249 do \
250 { \
251 fputs (SIZE_ASM_OP, STREAM); \
252 assemble_name (STREAM, NAME); \
253 fputs (", .-", STREAM); \
254 assemble_name (STREAM, NAME); \
255 putc ('\n', STREAM); \
256 } \
257 while (0)
258
259#endif
260#endif
261
262/* This determines whether or not we support weak symbols. SUPPORTS_WEAK
263 must be a preprocessor constant. */
264#ifndef SUPPORTS_WEAK
265#if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
266#define SUPPORTS_WEAK 1
267#else
268#define SUPPORTS_WEAK 0
269#endif
270#endif
271
272/* This determines whether or not we support weak symbols during target
273 code generation. TARGET_SUPPORTS_WEAK can be any valid C expression. */
274#ifndef TARGET_SUPPORTS_WEAK
275#define TARGET_SUPPORTS_WEAK (SUPPORTS_WEAK)
276#endif
277
278/* This determines whether or not we support the discriminator
279 attribute in the .loc directive. */
280#ifndef SUPPORTS_DISCRIMINATOR
281#ifdef HAVE_GAS_DISCRIMINATOR
282#define SUPPORTS_DISCRIMINATOR 1
283#else
284#define SUPPORTS_DISCRIMINATOR 0
285#endif
286#endif
287
288/* This determines whether or not we support marking sections with
289 SHF_GNU_RETAIN flag. Also require .init_array/.fini_array section
290 for constructors and destructors. */
291#ifndef SUPPORTS_SHF_GNU_RETAIN
292#if HAVE_GAS_SHF_GNU_RETAIN && HAVE_INITFINI_ARRAY_SUPPORT
293#define SUPPORTS_SHF_GNU_RETAIN 1
294#else
295#define SUPPORTS_SHF_GNU_RETAIN 0
296#endif
297#endif
298
299/* This determines whether or not we support link-once semantics. */
300#ifndef SUPPORTS_ONE_ONLY
301#ifdef MAKE_DECL_ONE_ONLY
302#define SUPPORTS_ONE_ONLY 1
303#else
304#define SUPPORTS_ONE_ONLY 0
305#endif
306#endif
307
308/* This determines whether weak symbols must be left out of a static
309 archive's table of contents. Defining this macro to be nonzero has
310 the consequence that certain symbols will not be made weak that
311 otherwise would be. The C++ ABI requires this macro to be zero;
312 see the documentation. */
313#ifndef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
314#define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 0
315#endif
316
317/* This determines whether or not we need linkonce unwind information. */
318#ifndef TARGET_USES_WEAK_UNWIND_INFO
319#define TARGET_USES_WEAK_UNWIND_INFO 0
320#endif
321
322/* By default, there is no prefix on user-defined symbols. */
323#ifndef USER_LABEL_PREFIX
324#define USER_LABEL_PREFIX ""
325#endif
326
327/* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
328 provide a weak attribute. Else define it to nothing.
329
330 This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
331 not available at that time.
332
333 Note, this is only for use by target files which we know are to be
334 compiled by GCC. */
335#ifndef TARGET_ATTRIBUTE_WEAK
336# if SUPPORTS_WEAK
337# define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
338# else
339# define TARGET_ATTRIBUTE_WEAK
340# endif
341#endif
342
343/* By default we can assume that all global symbols are in one namespace,
344 across all shared libraries. */
345#ifndef MULTIPLE_SYMBOL_SPACES
346# define MULTIPLE_SYMBOL_SPACES 0
347#endif
348
349/* If the target supports init_priority C++ attribute, give
350 SUPPORTS_INIT_PRIORITY a nonzero value. */
351#ifndef SUPPORTS_INIT_PRIORITY
352#define SUPPORTS_INIT_PRIORITY 1
353#endif /* SUPPORTS_INIT_PRIORITY */
354
355/* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
356 the rest of the DWARF 2 frame unwind support is also provided. */
357#if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
358#define DWARF2_UNWIND_INFO 1
359#endif
360
361/* If we have named sections, and we're using crtstuff to run ctors,
362 use them for registering eh frame information. */
363#if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
364 && !defined (EH_FRAME_THROUGH_COLLECT2)
365#ifndef EH_FRAME_SECTION_NAME
366#define EH_FRAME_SECTION_NAME ".eh_frame"
367#endif
368#endif
369
370/* On many systems, different EH table encodings are used under
371 difference circumstances. Some will require runtime relocations;
372 some will not. For those that do not require runtime relocations,
373 we would like to make the table read-only. However, since the
374 read-only tables may need to be combined with read-write tables
375 that do require runtime relocation, it is not safe to make the
376 tables read-only unless the linker will merge read-only and
377 read-write sections into a single read-write section. If your
378 linker does not have this ability, but your system is such that no
379 encoding used with non-PIC code will ever require a runtime
380 relocation, then you can define EH_TABLES_CAN_BE_READ_ONLY to 1 in
381 your target configuration file. */
382#ifndef EH_TABLES_CAN_BE_READ_ONLY
383#ifdef HAVE_LD_RO_RW_SECTION_MIXING
384#define EH_TABLES_CAN_BE_READ_ONLY 1
385#else
386#define EH_TABLES_CAN_BE_READ_ONLY 0
387#endif
388#endif
389
390/* Provide defaults for stuff that may not be defined when using
391 sjlj exceptions. */
392#ifndef EH_RETURN_DATA_REGNO
393#define EH_RETURN_DATA_REGNO(N) INVALID_REGNUM
394#endif
395
396/* Offset between the eh handler address and entry in eh tables. */
397#ifndef RETURN_ADDR_OFFSET
398#define RETURN_ADDR_OFFSET 0
399#endif
400
401#ifndef MASK_RETURN_ADDR
402#define MASK_RETURN_ADDR NULL_RTX
403#endif
404
405/* Number of hardware registers that go into the DWARF-2 unwind info.
406 If not defined, equals FIRST_PSEUDO_REGISTER */
407
408#ifndef DWARF_FRAME_REGISTERS
409#define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
410#endif
411
412/* Offsets recorded in opcodes are a multiple of this alignment factor. */
413#ifndef DWARF_CIE_DATA_ALIGNMENT
414#ifdef STACK_GROWS_DOWNWARD
415#define DWARF_CIE_DATA_ALIGNMENT (-((int) UNITS_PER_WORD))
416#else
417#define DWARF_CIE_DATA_ALIGNMENT ((int) UNITS_PER_WORD)
418#endif
419#endif
420
421/* The DWARF 2 CFA column which tracks the return address. Normally this
422 is the column for PC, or the first column after all of the hard
423 registers. */
424#ifndef DWARF_FRAME_RETURN_COLUMN
425#ifdef PC_REGNUM
426#define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (PC_REGNUM)
427#else
428#define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGISTERS
429#endif
430#endif
431
432/* How to renumber registers for gdb. If not defined, assume
433 no renumbering is necessary. */
434
435#ifndef DEBUGGER_REGNO
436#define DEBUGGER_REGNO(REGNO) (REGNO)
437#endif
438
439/* The mapping from gcc register number to DWARF 2 CFA column number.
440 By default, we just provide columns for all registers. */
441#ifndef DWARF_FRAME_REGNUM
442#define DWARF_FRAME_REGNUM(REG) DEBUGGER_REGNO (REG)
443#endif
444
445/* The mapping from dwarf CFA reg number to internal dwarf reg numbers. */
446#ifndef DWARF_REG_TO_UNWIND_COLUMN
447#define DWARF_REG_TO_UNWIND_COLUMN(REGNO) (REGNO)
448#endif
449
450/* Map register numbers held in the call frame info that gcc has
451 collected using DWARF_FRAME_REGNUM to those that should be output in
452 .debug_frame and .eh_frame. */
453#ifndef DWARF2_FRAME_REG_OUT
454#define DWARF2_FRAME_REG_OUT(REGNO, FOR_EH) (REGNO)
455#endif
456
457/* The size of addresses as they appear in the Dwarf 2 data.
458 Some architectures use word addresses to refer to code locations,
459 but Dwarf 2 info always uses byte addresses. On such machines,
460 Dwarf 2 addresses need to be larger than the architecture's
461 pointers. */
462#ifndef DWARF2_ADDR_SIZE
463#define DWARF2_ADDR_SIZE ((POINTER_SIZE + BITS_PER_UNIT - 1) / BITS_PER_UNIT)
464#endif
465
466/* The size in bytes of a DWARF field indicating an offset or length
467 relative to a debug info section, specified to be 4 bytes in the
468 DWARF-2 specification. The SGI/MIPS ABI defines it to be the same
469 as PTR_SIZE. */
470#ifndef DWARF_OFFSET_SIZE
471#define DWARF_OFFSET_SIZE 4
472#endif
473
474/* The size in bytes of a DWARF 4 type signature. */
475#ifndef DWARF_TYPE_SIGNATURE_SIZE
476#define DWARF_TYPE_SIGNATURE_SIZE 8
477#endif
478
479/* Default sizes for base C types. If the sizes are different for
480 your target, you should override these values by defining the
481 appropriate symbols in your tm.h file. */
482
483#ifndef BITS_PER_WORD
484#define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
485#endif
486
487#ifndef CHAR_TYPE_SIZE
488#define CHAR_TYPE_SIZE BITS_PER_UNIT
489#endif
490
491#ifndef BOOL_TYPE_SIZE
492/* `bool' has size and alignment `1', on almost all platforms. */
493#define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
494#endif
495
496#ifndef SHORT_TYPE_SIZE
497#define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
498#endif
499
500#ifndef INT_TYPE_SIZE
501#define INT_TYPE_SIZE BITS_PER_WORD
502#endif
503
504#ifndef LONG_TYPE_SIZE
505#define LONG_TYPE_SIZE BITS_PER_WORD
506#endif
507
508#ifndef LONG_LONG_TYPE_SIZE
509#define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
510#endif
511
512#ifndef WCHAR_TYPE_SIZE
513#define WCHAR_TYPE_SIZE INT_TYPE_SIZE
514#endif
515
516#ifndef DECIMAL32_TYPE_SIZE
517#define DECIMAL32_TYPE_SIZE 32
518#endif
519
520#ifndef DECIMAL64_TYPE_SIZE
521#define DECIMAL64_TYPE_SIZE 64
522#endif
523
524#ifndef DECIMAL128_TYPE_SIZE
525#define DECIMAL128_TYPE_SIZE 128
526#endif
527
528#ifndef SHORT_FRACT_TYPE_SIZE
529#define SHORT_FRACT_TYPE_SIZE BITS_PER_UNIT
530#endif
531
532#ifndef FRACT_TYPE_SIZE
533#define FRACT_TYPE_SIZE (BITS_PER_UNIT * 2)
534#endif
535
536#ifndef LONG_FRACT_TYPE_SIZE
537#define LONG_FRACT_TYPE_SIZE (BITS_PER_UNIT * 4)
538#endif
539
540#ifndef LONG_LONG_FRACT_TYPE_SIZE
541#define LONG_LONG_FRACT_TYPE_SIZE (BITS_PER_UNIT * 8)
542#endif
543
544#ifndef SHORT_ACCUM_TYPE_SIZE
545#define SHORT_ACCUM_TYPE_SIZE (SHORT_FRACT_TYPE_SIZE * 2)
546#endif
547
548#ifndef ACCUM_TYPE_SIZE
549#define ACCUM_TYPE_SIZE (FRACT_TYPE_SIZE * 2)
550#endif
551
552#ifndef LONG_ACCUM_TYPE_SIZE
553#define LONG_ACCUM_TYPE_SIZE (LONG_FRACT_TYPE_SIZE * 2)
554#endif
555
556#ifndef LONG_LONG_ACCUM_TYPE_SIZE
557#define LONG_LONG_ACCUM_TYPE_SIZE (LONG_LONG_FRACT_TYPE_SIZE * 2)
558#endif
559
560/* We let tm.h override the types used here, to handle trivial differences
561 such as the choice of unsigned int or long unsigned int for size_t.
562 When machines start needing nontrivial differences in the size type,
563 it would be best to do something here to figure out automatically
564 from other information what type to use. */
565
566#ifndef SIZE_TYPE
567#define SIZE_TYPE "long unsigned int"
568#endif
569
570#ifndef SIZETYPE
571#define SIZETYPE SIZE_TYPE
572#endif
573
574#ifndef PID_TYPE
575#define PID_TYPE "int"
576#endif
577
578/* If GCC knows the exact uint_least16_t and uint_least32_t types from
579 <stdint.h>, use them for char16_t and char32_t. Otherwise, use
580 these guesses; getting the wrong type of a given width will not
581 affect C++ name mangling because in C++ these are distinct types
582 not typedefs. */
583
584#ifndef CHAR8_TYPE
585#define CHAR8_TYPE "unsigned char"
586#endif
587
588#ifdef UINT_LEAST16_TYPE
589#define CHAR16_TYPE UINT_LEAST16_TYPE
590#else
591#define CHAR16_TYPE "short unsigned int"
592#endif
593
594#ifdef UINT_LEAST32_TYPE
595#define CHAR32_TYPE UINT_LEAST32_TYPE
596#else
597#define CHAR32_TYPE "unsigned int"
598#endif
599
600#ifndef WCHAR_TYPE
601#define WCHAR_TYPE "int"
602#endif
603
604/* WCHAR_TYPE gets overridden by -fshort-wchar. */
605#define MODIFIED_WCHAR_TYPE \
606 (flag_short_wchar ? "short unsigned int" : WCHAR_TYPE)
607
608#ifndef PTRDIFF_TYPE
609#define PTRDIFF_TYPE "long int"
610#endif
611
612#ifndef WINT_TYPE
613#define WINT_TYPE "unsigned int"
614#endif
615
616#ifndef INTMAX_TYPE
617#define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
618 ? "int" \
619 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
620 ? "long int" \
621 : "long long int"))
622#endif
623
624#ifndef UINTMAX_TYPE
625#define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
626 ? "unsigned int" \
627 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
628 ? "long unsigned int" \
629 : "long long unsigned int"))
630#endif
631
632
633/* There are no default definitions of these <stdint.h> types. */
634
635#ifndef SIG_ATOMIC_TYPE
636#define SIG_ATOMIC_TYPE ((const char *) NULL)
637#endif
638
639#ifndef INT8_TYPE
640#define INT8_TYPE ((const char *) NULL)
641#endif
642
643#ifndef INT16_TYPE
644#define INT16_TYPE ((const char *) NULL)
645#endif
646
647#ifndef INT32_TYPE
648#define INT32_TYPE ((const char *) NULL)
649#endif
650
651#ifndef INT64_TYPE
652#define INT64_TYPE ((const char *) NULL)
653#endif
654
655#ifndef UINT8_TYPE
656#define UINT8_TYPE ((const char *) NULL)
657#endif
658
659#ifndef UINT16_TYPE
660#define UINT16_TYPE ((const char *) NULL)
661#endif
662
663#ifndef UINT32_TYPE
664#define UINT32_TYPE ((const char *) NULL)
665#endif
666
667#ifndef UINT64_TYPE
668#define UINT64_TYPE ((const char *) NULL)
669#endif
670
671#ifndef INT_LEAST8_TYPE
672#define INT_LEAST8_TYPE ((const char *) NULL)
673#endif
674
675#ifndef INT_LEAST16_TYPE
676#define INT_LEAST16_TYPE ((const char *) NULL)
677#endif
678
679#ifndef INT_LEAST32_TYPE
680#define INT_LEAST32_TYPE ((const char *) NULL)
681#endif
682
683#ifndef INT_LEAST64_TYPE
684#define INT_LEAST64_TYPE ((const char *) NULL)
685#endif
686
687#ifndef UINT_LEAST8_TYPE
688#define UINT_LEAST8_TYPE ((const char *) NULL)
689#endif
690
691#ifndef UINT_LEAST16_TYPE
692#define UINT_LEAST16_TYPE ((const char *) NULL)
693#endif
694
695#ifndef UINT_LEAST32_TYPE
696#define UINT_LEAST32_TYPE ((const char *) NULL)
697#endif
698
699#ifndef UINT_LEAST64_TYPE
700#define UINT_LEAST64_TYPE ((const char *) NULL)
701#endif
702
703#ifndef INT_FAST8_TYPE
704#define INT_FAST8_TYPE ((const char *) NULL)
705#endif
706
707#ifndef INT_FAST16_TYPE
708#define INT_FAST16_TYPE ((const char *) NULL)
709#endif
710
711#ifndef INT_FAST32_TYPE
712#define INT_FAST32_TYPE ((const char *) NULL)
713#endif
714
715#ifndef INT_FAST64_TYPE
716#define INT_FAST64_TYPE ((const char *) NULL)
717#endif
718
719#ifndef UINT_FAST8_TYPE
720#define UINT_FAST8_TYPE ((const char *) NULL)
721#endif
722
723#ifndef UINT_FAST16_TYPE
724#define UINT_FAST16_TYPE ((const char *) NULL)
725#endif
726
727#ifndef UINT_FAST32_TYPE
728#define UINT_FAST32_TYPE ((const char *) NULL)
729#endif
730
731#ifndef UINT_FAST64_TYPE
732#define UINT_FAST64_TYPE ((const char *) NULL)
733#endif
734
735#ifndef INTPTR_TYPE
736#define INTPTR_TYPE ((const char *) NULL)
737#endif
738
739#ifndef UINTPTR_TYPE
740#define UINTPTR_TYPE ((const char *) NULL)
741#endif
742
743/* Width in bits of a pointer. Mind the value of the macro `Pmode'. */
744#ifndef POINTER_SIZE
745#define POINTER_SIZE BITS_PER_WORD
746#endif
747#ifndef POINTER_SIZE_UNITS
748#define POINTER_SIZE_UNITS ((POINTER_SIZE + BITS_PER_UNIT - 1) / BITS_PER_UNIT)
749#endif
750
751
752#ifndef PIC_OFFSET_TABLE_REGNUM
753#define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
754#endif
755
756#ifndef PIC_OFFSET_TABLE_REG_CALL_CLOBBERED
757#define PIC_OFFSET_TABLE_REG_CALL_CLOBBERED 0
758#endif
759
760#ifndef TARGET_DLLIMPORT_DECL_ATTRIBUTES
761#define TARGET_DLLIMPORT_DECL_ATTRIBUTES 0
762#endif
763
764#ifndef TARGET_DECLSPEC
765#if TARGET_DLLIMPORT_DECL_ATTRIBUTES
766/* If the target supports the "dllimport" attribute, users are
767 probably used to the "__declspec" syntax. */
768#define TARGET_DECLSPEC 1
769#else
770#define TARGET_DECLSPEC 0
771#endif
772#endif
773
774/* By default, the preprocessor should be invoked the same way in C++
775 as in C. */
776#ifndef CPLUSPLUS_CPP_SPEC
777#ifdef CPP_SPEC
778#define CPLUSPLUS_CPP_SPEC CPP_SPEC
779#endif
780#endif
781
782#ifndef ACCUMULATE_OUTGOING_ARGS
783#define ACCUMULATE_OUTGOING_ARGS 0
784#endif
785
786/* By default, use the GNU runtime for Objective C. */
787#ifndef NEXT_OBJC_RUNTIME
788#define NEXT_OBJC_RUNTIME 0
789#endif
790
791/* Decide whether a function's arguments should be processed
792 from first to last or from last to first.
793
794 They should if the stack and args grow in opposite directions, but
795 only if we have push insns. */
796
797#ifdef PUSH_ROUNDING
798
799#ifndef PUSH_ARGS_REVERSED
800#if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
801#define PUSH_ARGS_REVERSED targetm.calls.push_argument (0)
802#endif
803#endif
804
805#endif
806
807#ifndef PUSH_ARGS_REVERSED
808#define PUSH_ARGS_REVERSED 0
809#endif
810
811/* Default value for the alignment (in bits) a C conformant malloc has to
812 provide. This default is intended to be safe and always correct. */
813#ifndef MALLOC_ABI_ALIGNMENT
814#define MALLOC_ABI_ALIGNMENT BITS_PER_WORD
815#endif
816
817/* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
818 STACK_BOUNDARY is required. */
819#ifndef PREFERRED_STACK_BOUNDARY
820#define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
821#endif
822
823/* Set INCOMING_STACK_BOUNDARY to PREFERRED_STACK_BOUNDARY if it is not
824 defined. */
825#ifndef INCOMING_STACK_BOUNDARY
826#define INCOMING_STACK_BOUNDARY PREFERRED_STACK_BOUNDARY
827#endif
828
829#ifndef TARGET_DEFAULT_PACK_STRUCT
830#define TARGET_DEFAULT_PACK_STRUCT 0
831#endif
832
833/* By default, the vtable entries are void pointers, the so the alignment
834 is the same as pointer alignment. The value of this macro specifies
835 the alignment of the vtable entry in bits. It should be defined only
836 when special alignment is necessary. */
837#ifndef TARGET_VTABLE_ENTRY_ALIGN
838#define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
839#endif
840
841/* There are a few non-descriptor entries in the vtable at offsets below
842 zero. If these entries must be padded (say, to preserve the alignment
843 specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
844 words in each data entry. */
845#ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
846#define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
847#endif
848
849/* Decide whether it is safe to use a local alias for a virtual function
850 when constructing thunks. */
851#ifndef TARGET_USE_LOCAL_THUNK_ALIAS_P
852#ifdef ASM_OUTPUT_DEF
853#define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 1
854#else
855#define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 0
856#endif
857#endif
858
859/* Decide whether target supports aliases. */
860#ifndef TARGET_SUPPORTS_ALIASES
861#ifdef ASM_OUTPUT_DEF
862#define TARGET_SUPPORTS_ALIASES 1
863#else
864#define TARGET_SUPPORTS_ALIASES 0
865#endif
866#endif
867
868/* Indicate whether the target uses "target" attributes for function
869 multiversioning. This is used to choose between the "target" and
870 "target_version" attributes when expanding a "target_clones" attribute, and
871 determine whether the "target" and "target_clones" attributes are mutually
872 exclusive. */
873#ifndef TARGET_HAS_FMV_TARGET_ATTRIBUTE
874#define TARGET_HAS_FMV_TARGET_ATTRIBUTE 1
875#endif
876
877/* Select a attribute separator for function multiversioning. */
878#ifndef TARGET_CLONES_ATTR_SEPARATOR
879#define TARGET_CLONES_ATTR_SEPARATOR ','
880#endif
881
882/* Select a format to encode pointers in exception handling data. We
883 prefer those that result in fewer dynamic relocations. Assume no
884 special support here and encode direct references. */
885#ifndef ASM_PREFERRED_EH_DATA_FORMAT
886#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) DW_EH_PE_absptr
887#endif
888
889/* By default, the C++ compiler will use the lowest bit of the pointer
890 to function to indicate a pointer-to-member-function points to a
891 virtual member function. However, if FUNCTION_BOUNDARY indicates
892 function addresses aren't always even, the lowest bit of the delta
893 field will be used. */
894#ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
895#define TARGET_PTRMEMFUNC_VBIT_LOCATION \
896 (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
897 ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
898#endif
899
900#ifndef DEFAULT_GDB_EXTENSIONS
901#define DEFAULT_GDB_EXTENSIONS 1
902#endif
903
904/* Default to DWARF2_DEBUGGING_INFO. Legacy targets can choose different
905 by defining PREFERRED_DEBUGGING_TYPE. */
906#ifndef PREFERRED_DEBUGGING_TYPE
907#if defined DWARF2_DEBUGGING_INFO || defined DWARF2_LINENO_DEBUGGING_INFO
908#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
909#else
910#error You must define PREFERRED_DEBUGGING_TYPE if DWARF is not supported
911#endif
912#endif
913
914#ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
915#define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
916#endif
917
918/* True if the targets integer-comparison functions return { 0, 1, 2
919 } to indicate { <, ==, > }. False if { -1, 0, 1 } is used
920 instead. The libgcc routines are biased. */
921#ifndef TARGET_LIB_INT_CMP_BIASED
922#define TARGET_LIB_INT_CMP_BIASED (true)
923#endif
924
925/* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
926 then the word-endianness is the same as for integers. */
927#ifndef FLOAT_WORDS_BIG_ENDIAN
928#define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
929#endif
930
931#ifndef REG_WORDS_BIG_ENDIAN
932#define REG_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
933#endif
934
935
936#ifndef TARGET_DEC_EVAL_METHOD
937#define TARGET_DEC_EVAL_METHOD 2
938#endif
939
940#ifndef HAS_LONG_COND_BRANCH
941#define HAS_LONG_COND_BRANCH 0
942#endif
943
944#ifndef HAS_LONG_UNCOND_BRANCH
945#define HAS_LONG_UNCOND_BRANCH 0
946#endif
947
948/* Determine whether __cxa_atexit, rather than atexit, is used to
949 register C++ destructors for local statics and global objects. */
950#ifndef DEFAULT_USE_CXA_ATEXIT
951#define DEFAULT_USE_CXA_ATEXIT 0
952#endif
953
954#if GCC_VERSION >= 3000 && defined IN_GCC
955/* These old constraint macros shouldn't appear anywhere in a
956 configuration using MD constraint definitions. */
957#endif
958
959/* Determin whether the target runtime library is Bionic */
960#ifndef TARGET_HAS_BIONIC
961#define TARGET_HAS_BIONIC 0
962#endif
963
964/* Indicate that CLZ and CTZ are undefined at zero. */
965#ifndef CLZ_DEFINED_VALUE_AT_ZERO
966#define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) 0
967#endif
968#ifndef CTZ_DEFINED_VALUE_AT_ZERO
969#define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) 0
970#endif
971
972/* Provide a default value for STORE_FLAG_VALUE. */
973#ifndef STORE_FLAG_VALUE
974#define STORE_FLAG_VALUE 1
975#endif
976
977/* This macro is used to determine what the largest unit size that
978 move_by_pieces can use is. */
979
980/* MOVE_MAX_PIECES is the number of bytes at a time which we can
981 move efficiently, as opposed to MOVE_MAX which is the maximum
982 number of bytes we can move with a single instruction. */
983
984#ifndef MOVE_MAX_PIECES
985#define MOVE_MAX_PIECES MOVE_MAX
986#endif
987
988/* STORE_MAX_PIECES is the number of bytes at a time that we can
989 store efficiently. Due to internal GCC limitations, this is
990 MOVE_MAX_PIECES limited by the number of bytes GCC can represent
991 for an immediate constant. */
992
993#ifndef STORE_MAX_PIECES
994#define STORE_MAX_PIECES MIN (MOVE_MAX_PIECES, 2 * sizeof (HOST_WIDE_INT))
995#endif
996
997/* Likewise for block comparisons. */
998#ifndef COMPARE_MAX_PIECES
999#define COMPARE_MAX_PIECES MOVE_MAX_PIECES
1000#endif
1001
1002#ifndef MAX_MOVE_MAX
1003#define MAX_MOVE_MAX MOVE_MAX
1004#endif
1005
1006#ifndef MIN_UNITS_PER_WORD
1007#define MIN_UNITS_PER_WORD UNITS_PER_WORD
1008#endif
1009
1010#ifndef MAX_BITS_PER_WORD
1011#define MAX_BITS_PER_WORD BITS_PER_WORD
1012#endif
1013
1014#ifndef STACK_POINTER_OFFSET
1015#define STACK_POINTER_OFFSET 0
1016#endif
1017
1018#ifndef LOCAL_REGNO
1019#define LOCAL_REGNO(REGNO) 0
1020#endif
1021
1022#ifndef HONOR_REG_ALLOC_ORDER
1023#define HONOR_REG_ALLOC_ORDER 0
1024#endif
1025
1026/* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
1027 the stack pointer does not matter. The value is tested only in
1028 functions that have frame pointers. */
1029#ifndef EXIT_IGNORE_STACK
1030#define EXIT_IGNORE_STACK 0
1031#endif
1032
1033/* Assume that case vectors are not pc-relative. */
1034#ifndef CASE_VECTOR_PC_RELATIVE
1035#define CASE_VECTOR_PC_RELATIVE 0
1036#endif
1037
1038/* Force minimum alignment to be able to use the least significant bits
1039 for distinguishing descriptor addresses from code addresses. */
1040#define FUNCTION_ALIGNMENT(ALIGN) \
1041 (lang_hooks.custom_function_descriptors \
1042 && targetm.calls.custom_function_descriptors > 0 \
1043 ? MAX ((ALIGN), \
1044 2 * targetm.calls.custom_function_descriptors * BITS_PER_UNIT)\
1045 : (ALIGN))
1046
1047/* Assume that trampolines need function alignment. */
1048#ifndef TRAMPOLINE_ALIGNMENT
1049#define TRAMPOLINE_ALIGNMENT FUNCTION_ALIGNMENT (FUNCTION_BOUNDARY)
1050#endif
1051
1052/* Register mappings for target machines without register windows. */
1053#ifndef INCOMING_REGNO
1054#define INCOMING_REGNO(N) (N)
1055#endif
1056
1057#ifndef OUTGOING_REGNO
1058#define OUTGOING_REGNO(N) (N)
1059#endif
1060
1061#ifndef SHIFT_COUNT_TRUNCATED
1062#define SHIFT_COUNT_TRUNCATED 0
1063#endif
1064
1065#ifndef LEGITIMATE_PIC_OPERAND_P
1066#define LEGITIMATE_PIC_OPERAND_P(X) 1
1067#endif
1068
1069#ifndef TARGET_MEM_CONSTRAINT
1070#define TARGET_MEM_CONSTRAINT 'm'
1071#endif
1072
1073#ifndef REVERSIBLE_CC_MODE
1074#define REVERSIBLE_CC_MODE(MODE) 0
1075#endif
1076
1077/* Biggest alignment supported by the object file format of this machine. */
1078#ifndef MAX_OFILE_ALIGNMENT
1079#define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
1080#endif
1081
1082#ifndef FRAME_GROWS_DOWNWARD
1083#define FRAME_GROWS_DOWNWARD 0
1084#endif
1085
1086#ifndef RETURN_ADDR_IN_PREVIOUS_FRAME
1087#define RETURN_ADDR_IN_PREVIOUS_FRAME 0
1088#endif
1089
1090/* On most machines, the CFA coincides with the first incoming parm. */
1091#ifndef ARG_POINTER_CFA_OFFSET
1092#define ARG_POINTER_CFA_OFFSET(FNDECL) \
1093 (FIRST_PARM_OFFSET (FNDECL) + crtl->args.pretend_args_size)
1094#endif
1095
1096/* On most machines, we use the CFA as DW_AT_frame_base. */
1097#ifndef CFA_FRAME_BASE_OFFSET
1098#define CFA_FRAME_BASE_OFFSET(FNDECL) 0
1099#endif
1100
1101/* The offset from the incoming value of %sp to the top of the stack frame
1102 for the current function. */
1103#ifndef INCOMING_FRAME_SP_OFFSET
1104#define INCOMING_FRAME_SP_OFFSET 0
1105#endif
1106
1107#ifndef HARD_REGNO_NREGS_HAS_PADDING
1108#define HARD_REGNO_NREGS_HAS_PADDING(REGNO, MODE) 0
1109#define HARD_REGNO_NREGS_WITH_PADDING(REGNO, MODE) -1
1110#endif
1111
1112#ifndef OUTGOING_REG_PARM_STACK_SPACE
1113#define OUTGOING_REG_PARM_STACK_SPACE(FNTYPE) 0
1114#endif
1115
1116/* MAX_STACK_ALIGNMENT is the maximum stack alignment guaranteed by
1117 the backend. MAX_SUPPORTED_STACK_ALIGNMENT is the maximum best
1118 effort stack alignment supported by the backend. If the backend
1119 supports stack alignment, MAX_SUPPORTED_STACK_ALIGNMENT and
1120 MAX_STACK_ALIGNMENT are the same. Otherwise, the incoming stack
1121 boundary will limit the maximum guaranteed stack alignment. */
1122#ifdef MAX_STACK_ALIGNMENT
1123#define MAX_SUPPORTED_STACK_ALIGNMENT MAX_STACK_ALIGNMENT
1124#else
1125#define MAX_STACK_ALIGNMENT STACK_BOUNDARY
1126#define MAX_SUPPORTED_STACK_ALIGNMENT PREFERRED_STACK_BOUNDARY
1127#endif
1128
1129#define SUPPORTS_STACK_ALIGNMENT (MAX_STACK_ALIGNMENT > STACK_BOUNDARY)
1130
1131#ifndef LOCAL_ALIGNMENT
1132#define LOCAL_ALIGNMENT(TYPE, ALIGNMENT) ALIGNMENT
1133#endif
1134
1135#ifndef STACK_SLOT_ALIGNMENT
1136#define STACK_SLOT_ALIGNMENT(TYPE,MODE,ALIGN) \
1137 ((TYPE) ? LOCAL_ALIGNMENT ((TYPE), (ALIGN)) : (ALIGN))
1138#endif
1139
1140#ifndef LOCAL_DECL_ALIGNMENT
1141#define LOCAL_DECL_ALIGNMENT(DECL) \
1142 LOCAL_ALIGNMENT (TREE_TYPE (DECL), DECL_ALIGN (DECL))
1143#endif
1144
1145#ifndef MINIMUM_ALIGNMENT
1146#define MINIMUM_ALIGNMENT(EXP,MODE,ALIGN) (ALIGN)
1147#endif
1148
1149/* Alignment value for attribute ((aligned)). */
1150#ifndef ATTRIBUTE_ALIGNED_VALUE
1151#define ATTRIBUTE_ALIGNED_VALUE BIGGEST_ALIGNMENT
1152#endif
1153
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)
1158#endif
1159
1160#ifndef MAX_FIXED_MODE_SIZE
1161#define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode)
1162#endif
1163
1164/* Nonzero if structures and unions should be returned in memory.
1165
1166 This should only be defined if compatibility with another compiler or
1167 with an ABI is needed, because it results in slower code. */
1168
1169#ifndef DEFAULT_PCC_STRUCT_RETURN
1170#define DEFAULT_PCC_STRUCT_RETURN 1
1171#endif
1172
1173#ifndef PCC_BITFIELD_TYPE_MATTERS
1174#define PCC_BITFIELD_TYPE_MATTERS false
1175#endif
1176
1177#ifndef INSN_SETS_ARE_DELAYED
1178#define INSN_SETS_ARE_DELAYED(INSN) false
1179#endif
1180
1181#ifndef INSN_REFERENCES_ARE_DELAYED
1182#define INSN_REFERENCES_ARE_DELAYED(INSN) false
1183#endif
1184
1185#ifndef NO_FUNCTION_CSE
1186#define NO_FUNCTION_CSE false
1187#endif
1188
1189#ifndef HARD_REGNO_RENAME_OK
1190#define HARD_REGNO_RENAME_OK(FROM, TO) true
1191#endif
1192
1193#ifndef EPILOGUE_USES
1194#define EPILOGUE_USES(REG) false
1195#endif
1196
1197#ifndef ARGS_GROW_DOWNWARD
1198#define ARGS_GROW_DOWNWARD 0
1199#endif
1200
1201#ifndef STACK_GROWS_DOWNWARD
1202#define STACK_GROWS_DOWNWARD 0
1203#endif
1204
1205#ifndef STACK_PUSH_CODE
1206#if STACK_GROWS_DOWNWARD
1207#define STACK_PUSH_CODE PRE_DEC
1208#else
1209#define STACK_PUSH_CODE PRE_INC
1210#endif
1211#endif
1212
1213/* Default value for flag_pie when flag_pie is initialized to -1:
1214 --enable-default-pie: Default flag_pie to -fPIE.
1215 --disable-default-pie: Default flag_pie to 0.
1216 */
1217#ifdef ENABLE_DEFAULT_PIE
1218# ifndef DEFAULT_FLAG_PIE
1219# define DEFAULT_FLAG_PIE 2
1220# endif
1221#else
1222# define DEFAULT_FLAG_PIE 0
1223#endif
1224
1225#ifndef SWITCHABLE_TARGET
1226#define SWITCHABLE_TARGET 0
1227#endif
1228
1229/* If the target supports integers that are wider than two
1230 HOST_WIDE_INTs on the host compiler, then the target should define
1231 TARGET_SUPPORTS_WIDE_INT and make the appropriate fixups.
1232 Otherwise the compiler really is not robust. */
1233#ifndef TARGET_SUPPORTS_WIDE_INT
1234#define TARGET_SUPPORTS_WIDE_INT 0
1235#endif
1236
1237#ifndef SHORT_IMMEDIATES_SIGN_EXTEND
1238#define SHORT_IMMEDIATES_SIGN_EXTEND 0
1239#endif
1240
1241#ifndef WORD_REGISTER_OPERATIONS
1242#define WORD_REGISTER_OPERATIONS 0
1243#endif
1244
1245#ifndef LOAD_EXTEND_OP
1246#define LOAD_EXTEND_OP(M) UNKNOWN
1247#endif
1248
1249#ifndef INITIAL_FRAME_ADDRESS_RTX
1250#define INITIAL_FRAME_ADDRESS_RTX NULL
1251#endif
1252
1253#ifndef SETUP_FRAME_ADDRESSES
1254#define SETUP_FRAME_ADDRESSES() do { } while (0)
1255#endif
1256
1257#ifndef DYNAMIC_CHAIN_ADDRESS
1258#define DYNAMIC_CHAIN_ADDRESS(x) (x)
1259#endif
1260
1261#ifndef FRAME_ADDR_RTX
1262#define FRAME_ADDR_RTX(x) (x)
1263#endif
1264
1265#ifndef REVERSE_CONDITION
1266#define REVERSE_CONDITION(code, mode) reverse_condition (code)
1267#endif
1268
1269#ifndef TARGET_PECOFF
1270#define TARGET_PECOFF 0
1271#endif
1272
1273#ifndef TARGET_COFF
1274#define TARGET_COFF 0
1275#endif
1276
1277#ifndef EH_RETURN_HANDLER_RTX
1278#define EH_RETURN_HANDLER_RTX NULL
1279#endif
1280
1281#ifdef GCC_INSN_FLAGS_H
1282/* Dependent default target macro definitions
1283
1284 This section of defaults.h defines target macros that depend on generated
1285 headers. This is a bit awkward: We want to put all default definitions
1286 for target macros in defaults.h, but some of the defaults depend on the
1287 HAVE_* flags defines of insn-flags.h. But insn-flags.h is not always
1288 included by files that do include defaults.h.
1289
1290 Fortunately, the default macro definitions that depend on the HAVE_*
1291 macros are also the ones that will only be used inside GCC itself, i.e.
1292 not in the gen* programs or in target objects like libgcc.
1293
1294 Obviously, it would be best to keep this section of defaults.h as small
1295 as possible, by converting the macros defined below to target hooks or
1296 functions.
1297*/
1298
1299/* The default branch cost is 1. */
1300#ifndef BRANCH_COST
1301#define BRANCH_COST(speed_p, predictable_p) 1
1302#endif
1303
1304/* If a memory-to-memory move would take MOVE_RATIO or more simple
1305 move-instruction sequences, we will do a cpymem or libcall instead. */
1306
1307#ifndef MOVE_RATIO
1308#if defined (HAVE_cpymemqi) || defined (HAVE_cpymemhi) || defined (HAVE_cpymemsi) || defined (HAVE_cpymemdi) || defined (HAVE_cpymemti)
1309#define MOVE_RATIO(speed) 2
1310#else
1311/* If we are optimizing for space (-Os), cut down the default move ratio. */
1312#define MOVE_RATIO(speed) ((speed) ? 15 : 3)
1313#endif
1314#endif
1315
1316/* If a clear memory operation would take CLEAR_RATIO or more simple
1317 move-instruction sequences, we will do a setmem or libcall instead. */
1318
1319#ifndef CLEAR_RATIO
1320#if defined (HAVE_setmemqi) || defined (HAVE_setmemhi) || defined (HAVE_setmemsi) || defined (HAVE_setmemdi) || defined (HAVE_setmemti)
1321#define CLEAR_RATIO(speed) 2
1322#else
1323/* If we are optimizing for space, cut down the default clear ratio. */
1324#define CLEAR_RATIO(speed) ((speed) ? 15 :3)
1325#endif
1326#endif
1327
1328/* If a memory set (to value other than zero) operation would take
1329 SET_RATIO or more simple move-instruction sequences, we will do a setmem
1330 or libcall instead. */
1331#ifndef SET_RATIO
1332#define SET_RATIO(speed) MOVE_RATIO (speed)
1333#endif
1334
1335/* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
1336 Normally move_insn, so Pmode stack pointer. */
1337
1338#ifndef STACK_SAVEAREA_MODE
1339#define STACK_SAVEAREA_MODE(LEVEL) Pmode
1340#endif
1341
1342/* Supply a default definition of STACK_SIZE_MODE for
1343 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
1344
1345#ifndef STACK_SIZE_MODE
1346#define STACK_SIZE_MODE word_mode
1347#endif
1348
1349/* Default value for flag_stack_protect when flag_stack_protect is initialized to -1:
1350 --enable-default-ssp: Default flag_stack_protect to -fstack-protector-strong.
1351 --disable-default-ssp: Default flag_stack_protect to 0.
1352 */
1353#ifdef ENABLE_DEFAULT_SSP
1354# ifndef DEFAULT_FLAG_SSP
1355# define DEFAULT_FLAG_SSP 3
1356# endif
1357#else
1358# define DEFAULT_FLAG_SSP 0
1359#endif
1360
1361/* Provide default values for the macros controlling stack checking. */
1362
1363/* The default is neither full builtin stack checking... */
1364#ifndef STACK_CHECK_BUILTIN
1365#define STACK_CHECK_BUILTIN 0
1366#endif
1367
1368/* ...nor static builtin stack checking. */
1369#ifndef STACK_CHECK_STATIC_BUILTIN
1370#define STACK_CHECK_STATIC_BUILTIN 0
1371#endif
1372
1373/* The default interval is one page (4096 bytes). */
1374#ifndef STACK_CHECK_PROBE_INTERVAL_EXP
1375#define STACK_CHECK_PROBE_INTERVAL_EXP 12
1376#endif
1377
1378/* The default is not to move the stack pointer. */
1379#ifndef STACK_CHECK_MOVING_SP
1380#define STACK_CHECK_MOVING_SP 0
1381#endif
1382
1383/* This is a kludge to try to capture the discrepancy between the old
1384 mechanism (generic stack checking) and the new mechanism (static
1385 builtin stack checking). STACK_CHECK_PROTECT needs to be bumped
1386 for the latter because part of the protection area is effectively
1387 included in STACK_CHECK_MAX_FRAME_SIZE for the former. */
1388#ifdef STACK_CHECK_PROTECT
1389#define STACK_OLD_CHECK_PROTECT STACK_CHECK_PROTECT
1390#else
1391#define STACK_OLD_CHECK_PROTECT \
1392 (!global_options.x_flag_exceptions \
1393 ? 75 * UNITS_PER_WORD \
1394 : targetm_common.except_unwind_info (&global_options) == UI_SJLJ \
1395 ? 4 * 1024 \
1396 : 8 * 1024)
1397#endif
1398
1399/* Minimum amount of stack required to recover from an anticipated stack
1400 overflow detection. The default value conveys an estimate of the amount
1401 of stack required to propagate an exception. */
1402#ifndef STACK_CHECK_PROTECT
1403#define STACK_CHECK_PROTECT \
1404 (!global_options.x_flag_exceptions \
1405 ? 4 * 1024 \
1406 : targetm_common.except_unwind_info (&global_options) == UI_SJLJ \
1407 ? 8 * 1024 \
1408 : 12 * 1024)
1409#endif
1410
1411/* Make the maximum frame size be the largest we can and still only need
1412 one probe per function. */
1413#ifndef STACK_CHECK_MAX_FRAME_SIZE
1414#define STACK_CHECK_MAX_FRAME_SIZE \
1415 ((1 << STACK_CHECK_PROBE_INTERVAL_EXP) - UNITS_PER_WORD)
1416#endif
1417
1418/* This is arbitrary, but should be large enough everywhere. */
1419#ifndef STACK_CHECK_FIXED_FRAME_SIZE
1420#define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
1421#endif
1422
1423/* Provide a reasonable default for the maximum size of an object to
1424 allocate in the fixed frame. We may need to be able to make this
1425 controllable by the user at some point. */
1426#ifndef STACK_CHECK_MAX_VAR_SIZE
1427#define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
1428#endif
1429
1430/* By default, the C++ compiler will use function addresses in the
1431 vtable entries. Setting this nonzero tells the compiler to use
1432 function descriptors instead. The value of this macro says how
1433 many words wide the descriptor is (normally 2). It is assumed
1434 that the address of a function descriptor may be treated as a
1435 pointer to a function. */
1436#ifndef TARGET_VTABLE_USES_DESCRIPTORS
1437#define TARGET_VTABLE_USES_DESCRIPTORS 0
1438#endif
1439
1440#endif /* GCC_INSN_FLAGS_H */
1441
1442#ifndef DWARF_GNAT_ENCODINGS_DEFAULT
1443#define DWARF_GNAT_ENCODINGS_DEFAULT DWARF_GNAT_ENCODINGS_GDB
1444#endif
1445
1446/* When generating dwarf info, the default standard version we'll honor
1447 and advertise in absence of -gdwarf-<N> on the command line. */
1448#ifndef DWARF_VERSION_DEFAULT
1449#define DWARF_VERSION_DEFAULT 5
1450#endif
1451
1452#ifndef USED_FOR_TARGET
1453/* Done this way to keep gengtype happy. */
1454#if BITS_PER_UNIT == 8
1455#define TARGET_UNIT uint8_t
1456#elif BITS_PER_UNIT == 16
1457#define TARGET_UNIT uint16_t
1458#elif BITS_PER_UNIT == 32
1459#define TARGET_UNIT uint32_t
1460#else
1461#error Unknown BITS_PER_UNIT
1462#endif
1463typedef TARGET_UNIT target_unit;
1464#endif
1465
1466#endif /* ! GCC_DEFAULTS_H */
target_unit
TARGET_UNIT target_unit
Definition defaults.h:1459