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1 /* Target hook definitions.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
3 2011, 2012
4 Free Software Foundation, Inc.
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 3, or (at your option) any
9 later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>.
20 In other words, you are welcome to use, share and improve this program.
21 You are forbidden to forbid anyone else to use, share and improve
22 what you give them. Help stamp out software-hoarding! */
24 /* See target-hooks-macros.h for details of macros that should be
25 provided by the including file, and how to use them here. */
26 #include "target-hooks-macros.h"
28 #undef HOOK_TYPE
29 #define HOOK_TYPE "Target Hook"
31 HOOK_VECTOR (TARGET_INITIALIZER, gcc_target)
33 /* Functions that output assembler for the target. */
34 #define HOOK_PREFIX "TARGET_ASM_"
35 HOOK_VECTOR (TARGET_ASM_OUT, asm_out)
37 /* Opening and closing parentheses for asm expression grouping. */
38 DEFHOOKPOD
39 (open_paren,
40 "",
41 const char *, "(")
42 DEFHOOKPODX (close_paren, const char *, ")")
44 /* Assembler instructions for creating various kinds of integer object. */
45 DEFHOOKPOD
46 (byte_op,
47 "",
48 const char *, "\t.byte\t")
49 DEFHOOKPOD (aligned_op, "*", struct asm_int_op, TARGET_ASM_ALIGNED_INT_OP)
50 DEFHOOKPOD (unaligned_op, "*", struct asm_int_op, TARGET_ASM_UNALIGNED_INT_OP)
52 /* The maximum number of bytes to skip when applying
53 LABEL_ALIGN_AFTER_BARRIER. */
54 DEFHOOK
55 (label_align_after_barrier_max_skip,
56 "",
57 int, (rtx label),
58 default_label_align_after_barrier_max_skip)
60 /* The maximum number of bytes to skip when applying
61 LOOP_ALIGN. */
62 DEFHOOK
63 (loop_align_max_skip,
64 "",
65 int, (rtx label),
66 default_loop_align_max_skip)
68 /* The maximum number of bytes to skip when applying
69 LABEL_ALIGN. */
70 DEFHOOK
71 (label_align_max_skip,
72 "",
73 int, (rtx label),
74 default_label_align_max_skip)
76 /* The maximum number of bytes to skip when applying
77 JUMP_ALIGN. */
78 DEFHOOK
79 (jump_align_max_skip,
80 "",
81 int, (rtx label),
82 default_jump_align_max_skip)
84 /* Try to output the assembler code for an integer object whose
85 value is given by X. SIZE is the size of the object in bytes and
86 ALIGNED_P indicates whether it is aligned. Return true if
87 successful. Only handles cases for which BYTE_OP, ALIGNED_OP
88 and UNALIGNED_OP are NULL. */
89 DEFHOOK
90 (integer,
91 "",
92 /* Only handles cases for which BYTE_OP, ALIGNED_OP and UNALIGNED_OP are
93 NULL. */
94 bool, (rtx x, unsigned int size, int aligned_p),
95 default_assemble_integer)
97 /* Output code that will globalize a label. */
98 DEFHOOK
99 (globalize_label,
101 void, (FILE *stream, const char *name),
102 default_globalize_label)
104 /* Output code that will globalize a declaration. */
105 DEFHOOK
106 (globalize_decl_name,
108 void, (FILE *stream, tree decl), default_globalize_decl_name)
110 /* Output code that will emit a label for unwind info, if this
111 target requires such labels. Second argument is the decl the
112 unwind info is associated with, third is a boolean: true if
113 this is for exception handling, fourth is a boolean: true if
114 this is only a placeholder for an omitted FDE. */
115 DEFHOOK
116 (emit_unwind_label,
118 void, (FILE *stream, tree decl, int for_eh, int empty),
119 default_emit_unwind_label)
121 /* Output code that will emit a label to divide up the exception table. */
122 DEFHOOK
123 (emit_except_table_label,
125 void, (FILE *stream),
126 default_emit_except_table_label)
128 /* Emit a directive for setting the personality for the function. */
129 DEFHOOK
130 (emit_except_personality,
131 "If the target implements @code{TARGET_ASM_UNWIND_EMIT}, this hook may be\
132 used to emit a directive to install a personality hook into the unwind\
133 info. This hook should not be used if dwarf2 unwind info is used.",
134 void, (rtx personality),
135 NULL)
137 /* Emit any directives required to unwind this instruction. */
138 DEFHOOK
139 (unwind_emit,
141 void, (FILE *stream, rtx insn),
142 NULL)
144 DEFHOOKPOD
145 (unwind_emit_before_insn,
146 "True if the @code{TARGET_ASM_UNWIND_EMIT} hook should be called before\
147 the assembly for @var{insn} has been emitted, false if the hook should\
148 be called afterward.",
149 bool, true)
151 /* Generate an internal label.
152 For now this is just a wrapper for ASM_GENERATE_INTERNAL_LABEL. */
153 DEFHOOK_UNDOC
154 (generate_internal_label,
156 void, (char *buf, const char *prefix, unsigned long labelno),
157 default_generate_internal_label)
159 /* Output an internal label. */
160 DEFHOOK
161 (internal_label,
163 void, (FILE *stream, const char *prefix, unsigned long labelno),
164 default_internal_label)
166 /* Output label for the constant. */
167 DEFHOOK
168 (declare_constant_name,
170 void, (FILE *file, const char *name, const_tree expr, HOST_WIDE_INT size),
171 default_asm_declare_constant_name)
173 /* Emit a ttype table reference to a typeinfo object. */
174 DEFHOOK
175 (ttype,
177 bool, (rtx sym),
178 hook_bool_rtx_false)
180 /* Emit an assembler directive to set visibility for the symbol
181 associated with the tree decl. */
182 DEFHOOK
183 (assemble_visibility,
185 void, (tree decl, int visibility),
186 default_assemble_visibility)
188 /* Output the assembler code for entry to a function. */
189 DEFHOOK
190 (function_prologue,
192 void, (FILE *file, HOST_WIDE_INT size),
193 default_function_pro_epilogue)
195 /* Output the assembler code for end of prologue. */
196 DEFHOOK
197 (function_end_prologue,
199 void, (FILE *file),
200 no_asm_to_stream)
202 /* Output the assembler code for start of epilogue. */
203 DEFHOOK
204 (function_begin_epilogue,
206 void, (FILE *file),
207 no_asm_to_stream)
209 /* Output the assembler code for function exit. */
210 DEFHOOK
211 (function_epilogue,
213 void, (FILE *file, HOST_WIDE_INT size),
214 default_function_pro_epilogue)
216 /* Initialize target-specific sections. */
217 DEFHOOK
218 (init_sections,
220 void, (void),
221 hook_void_void)
223 /* Tell assembler to change to section NAME with attributes FLAGS.
224 If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with
225 which this section is associated. */
226 DEFHOOK
227 (named_section,
229 void, (const char *name, unsigned int flags, tree decl),
230 default_no_named_section)
232 /* Return preferred text (sub)section for function DECL.
233 Main purpose of this function is to separate cold, normal and hot
234 functions. STARTUP is true when function is known to be used only
235 at startup (from static constructors or it is main()).
236 EXIT is true when function is known to be used only at exit
237 (from static destructors).
238 Return NULL if function should go to default text section. */
239 DEFHOOK
240 (function_section,
242 section *, (tree decl, enum node_frequency freq, bool startup, bool exit),
243 default_function_section)
245 /* Output the assembler code for function exit. */
246 DEFHOOK
247 (function_switched_text_sections,
248 "Used by the target to emit any assembler directives or additional\
249 labels needed when a function is partitioned between different\
250 sections. Output should be written to @var{file}. The function\
251 decl is available as @var{decl} and the new section is `cold' if\
252 @var{new_is_cold} is @code{true}.",
253 void, (FILE *file, tree decl, bool new_is_cold),
254 default_function_switched_text_sections)
256 /* Return a mask describing how relocations should be treated when
257 selecting sections. Bit 1 should be set if global relocations
258 should be placed in a read-write section; bit 0 should be set if
259 local relocations should be placed in a read-write section. */
260 DEFHOOK
261 (reloc_rw_mask,
263 int, (void),
264 default_reloc_rw_mask)
266 /* Return a section for EXP. It may be a DECL or a constant. RELOC
267 is nonzero if runtime relocations must be applied; bit 1 will be
268 set if the runtime relocations require non-local name resolution.
269 ALIGN is the required alignment of the data. */
270 DEFHOOK
271 (select_section,
273 section *, (tree exp, int reloc, unsigned HOST_WIDE_INT align),
274 default_select_section)
276 /* Return a section for X. MODE is X's mode and ALIGN is its
277 alignment in bits. */
278 DEFHOOK
279 (select_rtx_section,
281 section *, (enum machine_mode mode, rtx x, unsigned HOST_WIDE_INT align),
282 default_select_rtx_section)
284 /* Select a unique section name for DECL. RELOC is the same as
285 for SELECT_SECTION. */
286 DEFHOOK
287 (unique_section,
289 void, (tree decl, int reloc),
290 default_unique_section)
292 /* Return the readonly data section associated with function DECL. */
293 DEFHOOK
294 (function_rodata_section,
296 section *, (tree decl),
297 default_function_rodata_section)
299 /* Nonnull if the target wants to override the default ".rodata" prefix
300 for mergeable data sections. */
301 DEFHOOKPOD
302 (mergeable_rodata_prefix,
303 "Usually, the compiler uses the prefix @code{\".rodata\"} to construct\n\
304 section names for mergeable constant data. Define this macro to override\n\
305 the string if a different section name should be used.",
306 const char *, ".rodata")
308 /* Return the section to be used for transactional memory clone tables. */
309 DEFHOOK
310 (tm_clone_table_section,
311 "Return the section that should be used for transactional memory clone\
312 tables.",
313 section *, (void), default_clone_table_section)
315 /* Output a constructor for a symbol with a given priority. */
316 DEFHOOK
317 (constructor,
319 void, (rtx symbol, int priority), NULL)
321 /* Output a destructor for a symbol with a given priority. */
322 DEFHOOK
323 (destructor,
325 void, (rtx symbol, int priority), NULL)
327 /* Output the assembler code for a thunk function. THUNK_DECL is the
328 declaration for the thunk function itself, FUNCTION is the decl for
329 the target function. DELTA is an immediate constant offset to be
330 added to THIS. If VCALL_OFFSET is nonzero, the word at
331 *(*this + vcall_offset) should be added to THIS. */
332 DEFHOOK
333 (output_mi_thunk,
335 void, (FILE *file, tree thunk_fndecl, HOST_WIDE_INT delta,
336 HOST_WIDE_INT vcall_offset, tree function),
337 NULL)
339 /* Determine whether output_mi_thunk would succeed. */
340 /* ??? Ideally, this hook would not exist, and success or failure
341 would be returned from output_mi_thunk directly. But there's
342 too much undo-able setup involved in invoking output_mi_thunk.
343 Could be fixed by making output_mi_thunk emit rtl instead of
344 text to the output file. */
345 DEFHOOK
346 (can_output_mi_thunk,
348 bool, (const_tree thunk_fndecl, HOST_WIDE_INT delta,
349 HOST_WIDE_INT vcall_offset, const_tree function),
350 hook_bool_const_tree_hwi_hwi_const_tree_false)
352 /* Output any boilerplate text needed at the beginning of a
353 translation unit. */
354 DEFHOOK
355 (file_start,
357 void, (void),
358 default_file_start)
360 /* Output any boilerplate text needed at the end of a translation unit. */
361 DEFHOOK
362 (file_end,
364 void, (void),
365 hook_void_void)
367 /* Output any boilerplate text needed at the beginning of an
368 LTO output stream. */
369 DEFHOOK
370 (lto_start,
372 void, (void),
373 hook_void_void)
375 /* Output any boilerplate text needed at the end of an
376 LTO output stream. */
377 DEFHOOK
378 (lto_end,
380 void, (void),
381 hook_void_void)
383 /* Output any boilerplace text needed at the end of a
384 translation unit before debug and unwind info is emitted. */
385 DEFHOOK
386 (code_end,
388 void, (void),
389 hook_void_void)
391 /* Output an assembler pseudo-op to declare a library function name
392 external. */
393 DEFHOOK
394 (external_libcall,
396 void, (rtx symref),
397 default_external_libcall)
399 /* Output an assembler directive to mark decl live. This instructs
400 linker to not dead code strip this symbol. */
401 DEFHOOK
402 (mark_decl_preserved,
404 void, (const char *symbol),
405 hook_void_constcharptr)
407 /* Output a record of the command line switches that have been passed. */
408 DEFHOOK
409 (record_gcc_switches,
411 int, (print_switch_type type, const char *text),
412 NULL)
414 /* The name of the section that the example ELF implementation of
415 record_gcc_switches will use to store the information. Target
416 specific versions of record_gcc_switches may or may not use
417 this information. */
418 DEFHOOKPOD
419 (record_gcc_switches_section,
421 const char *, ".GCC.command.line")
423 /* Output the definition of a section anchor. */
424 DEFHOOK
425 (output_anchor,
427 void, (rtx x),
428 default_asm_output_anchor)
430 DEFHOOK
431 (output_ident,
432 "Output a string based on @var{name}, suitable for the @samp{#ident} \
433 directive, or the equivalent directive or pragma in non-C-family languages. \
434 If this hook is not defined, nothing is output for the @samp{#ident} \
435 directive.",
436 void, (const char *name),
437 hook_void_constcharptr)
439 /* Output a DTP-relative reference to a TLS symbol. */
440 DEFHOOK
441 (output_dwarf_dtprel,
443 void, (FILE *file, int size, rtx x),
444 NULL)
446 /* Some target machines need to postscan each insn after it is output. */
447 DEFHOOK
448 (final_postscan_insn,
450 void, (FILE *file, rtx insn, rtx *opvec, int noperands),
451 NULL)
453 /* Emit the trampoline template. This hook may be NULL. */
454 DEFHOOK
455 (trampoline_template,
457 void, (FILE *f),
458 NULL)
460 DEFHOOK
461 (output_source_filename,
462 "Output COFF information or DWARF debugging information which indicates\
463 that filename @var{name} is the current source file to the stdio\
464 stream @var{file}.\n\
466 This target hook need not be defined if the standard form of output\
467 for the file format in use is appropriate.",
468 void ,(FILE *file, const char *name),
469 default_asm_output_source_filename)
471 DEFHOOK
472 (output_addr_const_extra,
474 bool, (FILE *file, rtx x),
475 hook_bool_FILEptr_rtx_false)
477 /* ??? The TARGET_PRINT_OPERAND* hooks are part of the asm_out struct,
478 even though that is not reflected in the macro name to override their
479 initializers. */
480 #undef HOOK_PREFIX
481 #define HOOK_PREFIX "TARGET_"
483 /* Emit a machine-specific insn operand. */
484 /* ??? tm.texi only documents the old macro PRINT_OPERAND,
485 not this hook, and uses a different name for the argument FILE. */
486 DEFHOOK_UNDOC
487 (print_operand,
489 void, (FILE *file, rtx x, int code),
490 default_print_operand)
492 /* Emit a machine-specific memory address. */
493 /* ??? tm.texi only documents the old macro PRINT_OPERAND_ADDRESS,
494 not this hook, and uses different argument names. */
495 DEFHOOK_UNDOC
496 (print_operand_address,
498 void, (FILE *file, rtx addr),
499 default_print_operand_address)
501 /* Determine whether CODE is a valid punctuation character for the
502 `print_operand' hook. */
503 /* ??? tm.texi only documents the old macro PRINT_OPERAND_PUNCT_VALID_P,
504 not this hook. */
505 DEFHOOK_UNDOC
506 (print_operand_punct_valid_p,
508 bool ,(unsigned char code),
509 default_print_operand_punct_valid_p)
511 /* Given a symbol name, perform same mangling as assemble_name and
512 ASM_OUTPUT_LABELREF, returning result as an IDENTIFIER_NODE. */
513 DEFHOOK
514 (mangle_assembler_name,
515 "Given a symbol @var{name}, perform same mangling as @code{varasm.c}'s\
516 @code{assemble_name}, but in memory rather than to a file stream, returning\
517 result as an @code{IDENTIFIER_NODE}. Required for correct LTO symtabs. The\
518 default implementation calls the @code{TARGET_STRIP_NAME_ENCODING} hook and\
519 then prepends the @code{USER_LABEL_PREFIX}, if any.",
520 tree, (const char *name),
521 default_mangle_assembler_name)
523 HOOK_VECTOR_END (asm_out)
525 /* Functions relating to instruction scheduling. All of these
526 default to null pointers, which haifa-sched.c looks for and handles. */
527 #undef HOOK_PREFIX
528 #define HOOK_PREFIX "TARGET_SCHED_"
529 HOOK_VECTOR (TARGET_SCHED, sched)
531 /* Given the current cost, COST, of an insn, INSN, calculate and
532 return a new cost based on its relationship to DEP_INSN through
533 the dependence LINK. The default is to make no adjustment. */
534 DEFHOOK
535 (adjust_cost,
537 int, (rtx insn, rtx link, rtx dep_insn, int cost), NULL)
539 /* Adjust the priority of an insn as you see fit. Returns the new priority. */
540 DEFHOOK
541 (adjust_priority,
543 int, (rtx insn, int priority), NULL)
545 /* Function which returns the maximum number of insns that can be
546 scheduled in the same machine cycle. This must be constant
547 over an entire compilation. The default is 1. */
548 DEFHOOK
549 (issue_rate,
551 int, (void), NULL)
553 /* Calculate how much this insn affects how many more insns we
554 can emit this cycle. Default is they all cost the same. */
555 DEFHOOK
556 (variable_issue,
558 int, (FILE *file, int verbose, rtx insn, int more), NULL)
560 /* Initialize machine-dependent scheduling code. */
561 DEFHOOK
562 (init,
564 void, (FILE *file, int verbose, int max_ready), NULL)
566 /* Finalize machine-dependent scheduling code. */
567 DEFHOOK
568 (finish,
570 void, (FILE *file, int verbose), NULL)
572 /* Initialize machine-dependent function wide scheduling code. */
573 DEFHOOK
574 (init_global,
576 void, (FILE *file, int verbose, int old_max_uid), NULL)
578 /* Finalize machine-dependent function wide scheduling code. */
579 DEFHOOK
580 (finish_global,
582 void, (FILE *file, int verbose), NULL)
584 /* Reorder insns in a machine-dependent fashion, in two different
585 places. Default does nothing. */
586 DEFHOOK
587 (reorder,
589 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
591 DEFHOOK
592 (reorder2,
594 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
596 /* The following member value is a pointer to a function called
597 after evaluation forward dependencies of insns in chain given
598 by two parameter values (head and tail correspondingly). */
599 DEFHOOK
600 (dependencies_evaluation_hook,
602 void, (rtx head, rtx tail), NULL)
604 /* The values of the following four members are pointers to functions
605 used to simplify the automaton descriptions. dfa_pre_cycle_insn and
606 dfa_post_cycle_insn give functions returning insns which are used to
607 change the pipeline hazard recognizer state when the new simulated
608 processor cycle correspondingly starts and finishes. The function
609 defined by init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are
610 used to initialize the corresponding insns. The default values of
611 the members result in not changing the automaton state when the
612 new simulated processor cycle correspondingly starts and finishes. */
614 DEFHOOK
615 (init_dfa_pre_cycle_insn,
617 void, (void), NULL)
619 DEFHOOK
620 (dfa_pre_cycle_insn,
622 rtx, (void), NULL)
624 DEFHOOK
625 (init_dfa_post_cycle_insn,
627 void, (void), NULL)
629 DEFHOOK
630 (dfa_post_cycle_insn,
632 rtx, (void), NULL)
634 /* The values of the following two members are pointers to
635 functions used to simplify the automaton descriptions.
636 dfa_pre_advance_cycle and dfa_post_advance_cycle are getting called
637 immediately before and after cycle is advanced. */
639 DEFHOOK
640 (dfa_pre_advance_cycle,
642 void, (void), NULL)
644 DEFHOOK
645 (dfa_post_advance_cycle,
647 void, (void), NULL)
649 /* The following member value is a pointer to a function returning value
650 which defines how many insns in queue `ready' will we try for
651 multi-pass scheduling. If the member value is nonzero and the
652 function returns positive value, the DFA based scheduler will make
653 multi-pass scheduling for the first cycle. In other words, we will
654 try to choose ready insn which permits to start maximum number of
655 insns on the same cycle. */
656 DEFHOOK
657 (first_cycle_multipass_dfa_lookahead,
659 int, (void), NULL)
661 /* The following member value is pointer to a function controlling
662 what insns from the ready insn queue will be considered for the
663 multipass insn scheduling. If the hook returns zero for insn
664 passed as the parameter, the insn will be not chosen to be issued. */
665 DEFHOOK
666 (first_cycle_multipass_dfa_lookahead_guard,
668 int, (rtx insn), NULL)
670 /* This hook prepares the target for a new round of multipass
671 scheduling.
672 DATA is a pointer to target-specific data used for multipass scheduling.
673 READY_TRY and N_READY represent the current state of search in the
674 optimization space. The target can filter out instructions that
675 should not be tried during current round by setting corresponding
676 elements in READY_TRY to non-zero.
677 FIRST_CYCLE_INSN_P is true if this is the first round of multipass
678 scheduling on current cycle. */
679 DEFHOOK
680 (first_cycle_multipass_begin,
682 void, (void *data, char *ready_try, int n_ready, bool first_cycle_insn_p),
683 NULL)
685 /* This hook is called when multipass scheduling evaluates instruction INSN.
686 DATA is a pointer to target-specific data that can be used to record effects
687 of INSN on CPU that are not described in DFA.
688 READY_TRY and N_READY represent the current state of search in the
689 optimization space. The target can filter out instructions that
690 should not be tried after issuing INSN by setting corresponding
691 elements in READY_TRY to non-zero.
692 INSN is the instruction being evaluated.
693 PREV_DATA is a pointer to target-specific data corresponding
694 to a state before issuing INSN. */
695 DEFHOOK
696 (first_cycle_multipass_issue,
698 void, (void *data, char *ready_try, int n_ready, rtx insn,
699 const void *prev_data), NULL)
701 /* This hook is called when multipass scheduling backtracks from evaluation of
702 instruction corresponding to DATA.
703 DATA is a pointer to target-specific data that stores the effects
704 of instruction from which the algorithm backtracks on CPU that are not
705 described in DFA.
706 READY_TRY and N_READY represent the current state of search in the
707 optimization space. The target can filter out instructions that
708 should not be tried after issuing INSN by setting corresponding
709 elements in READY_TRY to non-zero. */
710 DEFHOOK
711 (first_cycle_multipass_backtrack,
713 void, (const void *data, char *ready_try, int n_ready), NULL)
715 /* This hook notifies the target about the result of the concluded current
716 round of multipass scheduling.
717 DATA is a pointer.
718 If DATA is non-NULL it points to target-specific data used for multipass
719 scheduling which corresponds to instruction at the start of the chain of
720 the winning solution. DATA is NULL when multipass scheduling cannot find
721 a good enough solution on current cycle and decides to retry later,
722 usually after advancing the cycle count. */
723 DEFHOOK
724 (first_cycle_multipass_end,
726 void, (const void *data), NULL)
728 /* This hook is called to initialize target-specific data for multipass
729 scheduling after it has been allocated.
730 DATA is a pointer to target-specific data that stores the effects
731 of instruction from which the algorithm backtracks on CPU that are not
732 described in DFA. */
733 DEFHOOK
734 (first_cycle_multipass_init,
736 void, (void *data), NULL)
738 /* This hook is called to finalize target-specific data for multipass
739 scheduling before it is deallocated.
740 DATA is a pointer to target-specific data that stores the effects
741 of instruction from which the algorithm backtracks on CPU that are not
742 described in DFA. */
743 DEFHOOK
744 (first_cycle_multipass_fini,
746 void, (void *data), NULL)
748 /* The following member value is pointer to a function called by
749 the insn scheduler before issuing insn passed as the third
750 parameter on given cycle. If the hook returns nonzero, the
751 insn is not issued on given processors cycle. Instead of that,
752 the processor cycle is advanced. If the value passed through
753 the last parameter is zero, the insn ready queue is not sorted
754 on the new cycle start as usually. The first parameter passes
755 file for debugging output. The second one passes the scheduler
756 verbose level of the debugging output. The forth and the fifth
757 parameter values are correspondingly processor cycle on which
758 the previous insn has been issued and the current processor cycle. */
759 DEFHOOK
760 (dfa_new_cycle,
762 int, (FILE *dump, int verbose, rtx insn, int last_clock,
763 int clock, int *sort_p),
764 NULL)
766 /* The following member value is a pointer to a function called by the
767 insn scheduler. It should return true if there exists a dependence
768 which is considered costly by the target, between the insn
769 DEP_PRO (&_DEP), and the insn DEP_CON (&_DEP). The first parameter is
770 the dep that represents the dependence between the two insns. The
771 second argument is the cost of the dependence as estimated by
772 the scheduler. The last argument is the distance in cycles
773 between the already scheduled insn (first parameter) and the
774 second insn (second parameter). */
775 DEFHOOK
776 (is_costly_dependence,
778 bool, (struct _dep *_dep, int cost, int distance), NULL)
780 DEFHOOK_UNDOC
781 (adjust_cost_2,
782 "Given the current cost, @var{cost}, of an insn, @var{insn}, calculate and\
783 return a new cost based on its relationship to @var{dep_insn} through the\
784 dependence of weakness @var{dw}. The default is to make no adjustment.",
785 int, (rtx insn, int dep_type1, rtx dep_insn, int cost, int dw), NULL)
787 /* The following member value is a pointer to a function called
788 by the insn scheduler. This hook is called to notify the backend
789 that new instructions were emitted. */
790 DEFHOOK
791 (h_i_d_extended,
793 void, (void), NULL)
795 /* Next 5 functions are for multi-point scheduling. */
797 /* Allocate memory for scheduler context. */
798 DEFHOOK
799 (alloc_sched_context,
801 void *, (void), NULL)
803 /* Fills the context from the local machine scheduler context. */
804 DEFHOOK
805 (init_sched_context,
807 void, (void *tc, bool clean_p), NULL)
809 /* Sets local machine scheduler context to a saved value. */
810 DEFHOOK
811 (set_sched_context,
813 void, (void *tc), NULL)
815 /* Clears a scheduler context so it becomes like after init. */
816 DEFHOOK
817 (clear_sched_context,
819 void, (void *tc), NULL)
821 /* Frees the scheduler context. */
822 DEFHOOK
823 (free_sched_context,
825 void, (void *tc), NULL)
827 /* The following member value is a pointer to a function called
828 by the insn scheduler.
829 The first parameter is an instruction, the second parameter is the type
830 of the requested speculation, and the third parameter is a pointer to the
831 speculative pattern of the corresponding type (set if return value == 1).
832 It should return
833 -1, if there is no pattern, that will satisfy the requested speculation type,
834 0, if current pattern satisfies the requested speculation type,
835 1, if pattern of the instruction should be changed to the newly
836 generated one. */
837 DEFHOOK
838 (speculate_insn,
840 int, (rtx insn, int request, rtx *new_pat), NULL)
842 /* The following member value is a pointer to a function called
843 by the insn scheduler. It should return true if the check instruction
844 passed as the parameter needs a recovery block. */
845 DEFHOOK
846 (needs_block_p,
848 bool, (int dep_status), NULL)
850 /* The following member value is a pointer to a function called
851 by the insn scheduler. It should return a pattern for the check
852 instruction.
853 The first parameter is a speculative instruction, the second parameter
854 is the label of the corresponding recovery block (or null, if it is a
855 simple check). If the mutation of the check is requested (e.g. from
856 ld.c to chk.a), the third parameter is true - in this case the first
857 parameter is the previous check. */
858 DEFHOOK
859 (gen_spec_check,
861 rtx, (rtx insn, rtx label, int mutate_p), NULL)
863 /* The following member value is a pointer to a function controlling
864 what insns from the ready insn queue will be considered for the
865 multipass insn scheduling. If the hook returns zero for the insn
866 passed as the parameter, the insn will not be chosen to be
867 issued. This hook is used to discard speculative instructions,
868 that stand at the first position of the ready list. */
869 DEFHOOK
870 (first_cycle_multipass_dfa_lookahead_guard_spec,
872 bool, (const_rtx insn), NULL)
874 /* The following member value is a pointer to a function that provides
875 information about the speculation capabilities of the target.
876 The parameter is a pointer to spec_info variable. */
877 DEFHOOK
878 (set_sched_flags,
880 void, (struct spec_info_def *spec_info), NULL)
882 DEFHOOK_UNDOC
883 (get_insn_spec_ds,
884 "Return speculation types of instruction @var{insn}.",
885 int, (rtx insn), NULL)
887 DEFHOOK_UNDOC
888 (get_insn_checked_ds,
889 "Return speculation types that are checked for instruction @var{insn}",
890 int, (rtx insn), NULL)
892 DEFHOOK_UNDOC
893 (skip_rtx_p,
894 "Return bool if rtx scanning should just skip current layer and\
895 advance to the inner rtxes.",
896 bool, (const_rtx x), NULL)
898 /* The following member value is a pointer to a function that provides
899 information about the target resource-based lower bound which is
900 used by the swing modulo scheduler. The parameter is a pointer
901 to ddg variable. */
902 DEFHOOK
903 (sms_res_mii,
905 int, (struct ddg *g), NULL)
907 /* The following member value is a function that initializes dispatch
908 schedling and adds instructions to dispatch window according to its
909 parameters. */
910 DEFHOOK
911 (dispatch_do,
913 void, (rtx insn, int x),
914 hook_void_rtx_int)
916 /* The following member value is a a function that returns true is
917 dispatch schedling is supported in hardware and condition passed
918 as the second parameter is true. */
919 DEFHOOK
920 (dispatch,
922 bool, (rtx insn, int x),
923 hook_bool_rtx_int_false)
925 DEFHOOKPOD
926 (exposed_pipeline,
927 "True if the processor has an exposed pipeline, which means that not just\n\
928 the order of instructions is important for correctness when scheduling, but\n\
929 also the latencies of operations.",
930 bool, false)
932 /* The following member value is a function that returns number
933 of operations reassociator should try to put in parallel for
934 statements of the given type. By default 1 is used. */
935 DEFHOOK
936 (reassociation_width,
937 "This hook is called by tree reassociator to determine a level of\n\
938 parallelism required in output calculations chain.",
939 int, (unsigned int opc, enum machine_mode mode),
940 hook_int_uint_mode_1)
942 HOOK_VECTOR_END (sched)
944 /* Functions relating to vectorization. */
945 #undef HOOK_PREFIX
946 #define HOOK_PREFIX "TARGET_VECTORIZE_"
947 HOOK_VECTOR (TARGET_VECTORIZE, vectorize)
949 /* The following member value is a pointer to a function called
950 by the vectorizer, and return the decl of the target builtin
951 function. */
952 DEFHOOK
953 (builtin_mask_for_load,
955 tree, (void), NULL)
957 /* Returns a code for builtin that realizes vectorized version of
958 function, or NULL_TREE if not available. */
959 DEFHOOK
960 (builtin_vectorized_function,
962 tree, (tree fndecl, tree vec_type_out, tree vec_type_in),
963 default_builtin_vectorized_function)
965 /* Returns a function declaration for a builtin that realizes the
966 vector conversion, or NULL_TREE if not available. */
967 DEFHOOK
968 (builtin_conversion,
970 tree, (unsigned code, tree dest_type, tree src_type),
971 default_builtin_vectorized_conversion)
973 /* Cost of different vector/scalar statements in vectorization cost
974 model. In case of misaligned vector loads and stores the cost depends
975 on the data type and misalignment value. */
976 DEFHOOK
977 (builtin_vectorization_cost,
979 int, (enum vect_cost_for_stmt type_of_cost, tree vectype, int misalign),
980 default_builtin_vectorization_cost)
982 /* Return true if vector alignment is reachable (by peeling N
983 iterations) for the given type. */
984 DEFHOOK
985 (vector_alignment_reachable,
987 bool, (const_tree type, bool is_packed),
988 default_builtin_vector_alignment_reachable)
990 /* Return true if a vector created for vec_perm_const is valid.
991 A NULL indicates that all constants are valid permutations. */
992 DEFHOOK
993 (vec_perm_const_ok,
995 bool, (enum machine_mode, const unsigned char *sel),
996 NULL)
998 /* Return true if the target supports misaligned store/load of a
999 specific factor denoted in the third parameter. The last parameter
1000 is true if the access is defined in a packed struct. */
1001 DEFHOOK
1002 (support_vector_misalignment,
1004 bool,
1005 (enum machine_mode mode, const_tree type, int misalignment, bool is_packed),
1006 default_builtin_support_vector_misalignment)
1008 /* Return the builtin decl needed to load a vector of TYPE. */
1009 DEFHOOK
1010 (builtin_tm_load,
1011 "This hook should return the built-in decl needed to load a vector of the "
1012 "given type within a transaction.",
1013 tree,
1014 (tree),
1015 default_builtin_tm_load_store)
1017 /* Return the builtin decl needed to store a vector of TYPE. */
1018 DEFHOOK
1019 (builtin_tm_store,
1020 "This hook should return the built-in decl needed to store a vector of the "
1021 "given type within a transaction.",
1022 tree,
1023 (tree),
1024 default_builtin_tm_load_store)
1026 /* Returns the preferred mode for SIMD operations for the specified
1027 scalar mode. */
1028 DEFHOOK
1029 (preferred_simd_mode,
1031 enum machine_mode,
1032 (enum machine_mode mode),
1033 default_preferred_simd_mode)
1035 /* Returns a mask of vector sizes to iterate over when auto-vectorizing
1036 after processing the preferred one derived from preferred_simd_mode. */
1037 DEFHOOK
1038 (autovectorize_vector_sizes,
1040 unsigned int,
1041 (void),
1042 default_autovectorize_vector_sizes)
1044 /* Target builtin that implements vector gather operation. */
1045 DEFHOOK
1046 (builtin_gather,
1048 tree,
1049 (const_tree mem_vectype, const_tree index_type, int scale),
1050 NULL)
1052 /* Target function to initialize the cost model for a loop or block. */
1053 DEFHOOK
1054 (init_cost,
1055 "This hook should initialize target-specific data structures in preparation "
1056 "for modeling the costs of vectorizing a loop or basic block. The default "
1057 "allocates three unsigned integers for accumulating costs for the prologue, "
1058 "body, and epilogue of the loop or basic block. If @var{loop_info} is "
1059 "non-NULL, it identifies the loop being vectorized; otherwise a single block "
1060 "is being vectorized.",
1061 void *,
1062 (struct loop *loop_info),
1063 default_init_cost)
1065 /* Target function to record N statements of the given kind using the
1066 given vector type within the cost model data for the current loop or
1067 block. */
1068 DEFHOOK
1069 (add_stmt_cost,
1070 "This hook should update the target-specific @var{data} in response to "
1071 "adding @var{count} copies of the given @var{kind} of statement to a "
1072 "loop or basic block. The default adds the builtin vectorizer cost for "
1073 "the copies of the statement to the accumulator specified by @var{where}, "
1074 "(the prologue, body, or epilogue) and returns the amount added. The "
1075 "return value should be viewed as a tentative cost that may later be "
1076 "revised.",
1077 unsigned,
1078 (void *data, int count, enum vect_cost_for_stmt kind,
1079 struct _stmt_vec_info *stmt_info, int misalign,
1080 enum vect_cost_model_location where),
1081 default_add_stmt_cost)
1083 /* Target function to calculate the total cost of the current vectorized
1084 loop or block. */
1085 DEFHOOK
1086 (finish_cost,
1087 "This hook should complete calculations of the cost of vectorizing a loop "
1088 "or basic block based on @var{data}, and return the prologue, body, and "
1089 "epilogue costs as unsigned integers. The default returns the value of "
1090 "the three accumulators.",
1091 void,
1092 (void *data, unsigned *prologue_cost, unsigned *body_cost,
1093 unsigned *epilogue_cost),
1094 default_finish_cost)
1096 /* Function to delete target-specific cost modeling data. */
1097 DEFHOOK
1098 (destroy_cost_data,
1099 "This hook should release @var{data} and any related data structures "
1100 "allocated by TARGET_VECTORIZE_INIT_COST. The default releases the "
1101 "accumulator.",
1102 void,
1103 (void *data),
1104 default_destroy_cost_data)
1106 HOOK_VECTOR_END (vectorize)
1108 #undef HOOK_PREFIX
1109 #define HOOK_PREFIX "TARGET_"
1111 /* Allow target specific overriding of option settings after options have
1112 been changed by an attribute or pragma or when it is reset at the
1113 end of the code affected by an attribute or pragma. */
1114 DEFHOOK
1115 (override_options_after_change,
1117 void, (void),
1118 hook_void_void)
1120 DEFHOOK_UNDOC
1121 (eh_return_filter_mode,
1122 "Return machine mode for filter value.",
1123 enum machine_mode, (void),
1124 default_eh_return_filter_mode)
1126 /* Return machine mode for libgcc expanded cmp instructions. */
1127 DEFHOOK
1128 (libgcc_cmp_return_mode,
1130 enum machine_mode, (void),
1131 default_libgcc_cmp_return_mode)
1133 /* Return machine mode for libgcc expanded shift instructions. */
1134 DEFHOOK
1135 (libgcc_shift_count_mode,
1137 enum machine_mode, (void),
1138 default_libgcc_shift_count_mode)
1140 /* Return machine mode to be used for _Unwind_Word type. */
1141 DEFHOOK
1142 (unwind_word_mode,
1144 enum machine_mode, (void),
1145 default_unwind_word_mode)
1147 /* Given two decls, merge their attributes and return the result. */
1148 DEFHOOK
1149 (merge_decl_attributes,
1151 tree, (tree olddecl, tree newdecl),
1152 merge_decl_attributes)
1154 /* Given two types, merge their attributes and return the result. */
1155 DEFHOOK
1156 (merge_type_attributes,
1158 tree, (tree type1, tree type2),
1159 merge_type_attributes)
1161 /* Table of machine attributes and functions to handle them.
1162 Ignored if NULL. */
1163 DEFHOOKPOD
1164 (attribute_table,
1166 const struct attribute_spec *, NULL)
1168 /* Return true iff attribute NAME expects a plain identifier as its first
1169 argument. */
1170 DEFHOOK
1171 (attribute_takes_identifier_p,
1173 bool, (const_tree name),
1174 hook_bool_const_tree_false)
1176 /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
1177 one if they are compatible and two if they are nearly compatible
1178 (which causes a warning to be generated). */
1179 DEFHOOK
1180 (comp_type_attributes,
1182 int, (const_tree type1, const_tree type2),
1183 hook_int_const_tree_const_tree_1)
1185 /* Assign default attributes to the newly defined TYPE. */
1186 DEFHOOK
1187 (set_default_type_attributes,
1189 void, (tree type),
1190 hook_void_tree)
1192 /* Insert attributes on the newly created DECL. */
1193 DEFHOOK
1194 (insert_attributes,
1196 void, (tree node, tree *attr_ptr),
1197 hook_void_tree_treeptr)
1199 /* Return true if FNDECL (which has at least one machine attribute)
1200 can be inlined despite its machine attributes, false otherwise. */
1201 DEFHOOK
1202 (function_attribute_inlinable_p,
1204 bool, (const_tree fndecl),
1205 hook_bool_const_tree_false)
1207 /* Return true if bitfields in RECORD_TYPE should follow the
1208 Microsoft Visual C++ bitfield layout rules. */
1209 DEFHOOK
1210 (ms_bitfield_layout_p,
1212 bool, (const_tree record_type),
1213 hook_bool_const_tree_false)
1215 /* For now this is only an interface to WORDS_BIG_ENDIAN for
1216 target-independent code like the front ends, need performance testing
1217 before switching completely to the target hook. */
1218 DEFHOOK_UNDOC
1219 (words_big_endian,
1221 bool, (void),
1222 targhook_words_big_endian)
1224 /* Likewise for FLOAT_WORDS_BIG_ENDIAN. */
1225 DEFHOOK_UNDOC
1226 (float_words_big_endian,
1228 bool, (void),
1229 targhook_float_words_big_endian)
1231 /* True if the target supports decimal floating point. */
1232 DEFHOOK
1233 (decimal_float_supported_p,
1235 bool, (void),
1236 default_decimal_float_supported_p)
1238 /* True if the target supports fixed-point. */
1239 DEFHOOK
1240 (fixed_point_supported_p,
1242 bool, (void),
1243 default_fixed_point_supported_p)
1245 /* Return true if anonymous bitfields affect structure alignment. */
1246 DEFHOOK
1247 (align_anon_bitfield,
1249 bool, (void),
1250 hook_bool_void_false)
1252 /* Return true if volatile bitfields should use the narrowest type possible.
1253 Return false if they should use the container type. */
1254 DEFHOOK
1255 (narrow_volatile_bitfield,
1257 bool, (void),
1258 hook_bool_void_false)
1260 /* Set up target-specific built-in functions. */
1261 DEFHOOK
1262 (init_builtins,
1264 void, (void),
1265 hook_void_void)
1267 /* Initialize (if INITIALIZE_P is true) and return the target-specific
1268 built-in function decl for CODE.
1269 Return NULL if that is not possible. Return error_mark_node if CODE
1270 is outside of the range of valid target builtin function codes. */
1271 DEFHOOK
1272 (builtin_decl,
1274 tree, (unsigned code, bool initialize_p), NULL)
1276 /* Expand a target-specific builtin. */
1277 DEFHOOK
1278 (expand_builtin,
1280 rtx,
1281 (tree exp, rtx target, rtx subtarget, enum machine_mode mode, int ignore),
1282 default_expand_builtin)
1284 /* Select a replacement for a target-specific builtin. This is done
1285 *before* regular type checking, and so allows the target to
1286 implement a crude form of function overloading. The result is a
1287 complete expression that implements the operation. PARAMS really
1288 has type VEC(tree,gc)*, but we don't want to include tree.h here. */
1289 DEFHOOK
1290 (resolve_overloaded_builtin,
1292 tree, (unsigned int /*location_t*/ loc, tree fndecl, void *arglist), NULL)
1294 /* Fold a target-specific builtin. */
1295 DEFHOOK
1296 (fold_builtin,
1298 tree, (tree fndecl, int n_args, tree *argp, bool ignore),
1299 hook_tree_tree_int_treep_bool_null)
1301 /* Target hook is used to compare the target attributes in two functions to
1302 determine which function's features get higher priority. This is used
1303 during function multi-versioning to figure out the order in which two
1304 versions must be dispatched. A function version with a higher priority
1305 is checked for dispatching earlier. DECL1 and DECL2 are
1306 the two function decls that will be compared. It returns positive value
1307 if DECL1 is higher priority, negative value if DECL2 is higher priority
1308 and 0 if they are the same. */
1309 DEFHOOK
1310 (compare_version_priority,
1312 int, (tree decl1, tree decl2), NULL)
1314 /* Target hook is used to generate the dispatcher logic to invoke the right
1315 function version at run-time for a given set of function versions.
1316 ARG points to the callgraph node of the dispatcher function whose body
1317 must be generated. */
1318 DEFHOOK
1319 (generate_version_dispatcher_body,
1321 tree, (void *arg), NULL)
1323 /* Target hook is used to get the dispatcher function for a set of function
1324 versions. The dispatcher function is called to invoke the right function
1325 version at run-time. DECL is one version from a set of semantically
1326 identical versions. */
1327 DEFHOOK
1328 (get_function_versions_dispatcher,
1330 tree, (void *decl), NULL)
1332 /* Returns a code for a target-specific builtin that implements
1333 reciprocal of the function, or NULL_TREE if not available. */
1334 DEFHOOK
1335 (builtin_reciprocal,
1337 tree, (unsigned fn, bool md_fn, bool sqrt),
1338 default_builtin_reciprocal)
1340 /* For a vendor-specific TYPE, return a pointer to a statically-allocated
1341 string containing the C++ mangling for TYPE. In all other cases, return
1342 NULL. */
1343 DEFHOOK
1344 (mangle_type,
1346 const char *, (const_tree type),
1347 hook_constcharptr_const_tree_null)
1349 /* Make any adjustments to libfunc names needed for this target. */
1350 DEFHOOK
1351 (init_libfuncs,
1353 void, (void),
1354 hook_void_void)
1356 /* Add a __gnu_ prefix to library functions rather than just __. */
1357 DEFHOOKPOD
1358 (libfunc_gnu_prefix,
1359 "If false (the default), internal library routines start with two\n\
1360 underscores. If set to true, these routines start with @code{__gnu_}\n\
1361 instead. E.g., @code{__muldi3} changes to @code{__gnu_muldi3}. This\n\
1362 currently only affects functions defined in @file{libgcc2.c}. If this\n\
1363 is set to true, the @file{tm.h} file must also\n\
1364 @code{#define LIBGCC2_GNU_PREFIX}.",
1365 bool, false)
1367 /* Given a decl, a section name, and whether the decl initializer
1368 has relocs, choose attributes for the section. */
1369 /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */
1370 DEFHOOK
1371 (section_type_flags,
1373 unsigned int, (tree decl, const char *name, int reloc),
1374 default_section_type_flags)
1376 /* True if new jumps cannot be created, to replace existing ones or
1377 not, at the current point in the compilation. */
1378 DEFHOOK
1379 (cannot_modify_jumps_p,
1381 bool, (void),
1382 hook_bool_void_false)
1384 /* True if FOLLOWER may be modified to follow FOLLOWEE. */
1385 DEFHOOK
1386 (can_follow_jump,
1387 "FOLLOWER and FOLLOWEE are JUMP_INSN instructions;\
1388 return true if FOLLOWER may be modified to follow FOLLOWEE;\
1389 false, if it can't.\
1390 For example, on some targets, certain kinds of branches can't be made to\
1391 follow through a hot/cold partitioning.",
1392 bool, (const_rtx follower, const_rtx followee),
1393 hook_bool_const_rtx_const_rtx_true)
1395 /* Return a register class for which branch target register
1396 optimizations should be applied. */
1397 DEFHOOK
1398 (branch_target_register_class,
1400 reg_class_t, (void),
1401 default_branch_target_register_class)
1403 /* Return true if branch target register optimizations should include
1404 callee-saved registers that are not already live during the current
1405 function. AFTER_PE_GEN is true if prologues and epilogues have
1406 already been generated. */
1407 DEFHOOK
1408 (branch_target_register_callee_saved,
1410 bool, (bool after_prologue_epilogue_gen),
1411 hook_bool_bool_false)
1413 /* Return true if the target supports conditional execution. */
1414 DEFHOOK
1415 (have_conditional_execution,
1417 bool, (void),
1418 default_have_conditional_execution)
1420 /* Return a new value for loop unroll size. */
1421 DEFHOOK
1422 (loop_unroll_adjust,
1424 unsigned, (unsigned nunroll, struct loop *loop),
1425 NULL)
1427 /* True if X is a legitimate MODE-mode immediate operand. */
1428 DEFHOOK
1429 (legitimate_constant_p,
1431 bool, (enum machine_mode mode, rtx x),
1432 hook_bool_mode_rtx_true)
1434 /* True if the constant X cannot be placed in the constant pool. */
1435 DEFHOOK
1436 (cannot_force_const_mem,
1438 bool, (enum machine_mode mode, rtx x),
1439 hook_bool_mode_rtx_false)
1441 DEFHOOK_UNDOC
1442 (cannot_copy_insn_p,
1443 "True if the insn @var{x} cannot be duplicated.",
1444 bool, (rtx), NULL)
1446 /* True if X is considered to be commutative. */
1447 DEFHOOK
1448 (commutative_p,
1450 bool, (const_rtx x, int outer_code),
1451 hook_bool_const_rtx_commutative_p)
1453 /* True if ADDR is an address-expression whose effect depends
1454 on the mode of the memory reference it is used in. */
1455 DEFHOOK
1456 (mode_dependent_address_p,
1458 bool, (const_rtx addr, addr_space_t addrspace),
1459 default_mode_dependent_address_p)
1461 /* Given an invalid address X for a given machine mode, try machine-specific
1462 ways to make it legitimate. Return X or an invalid address on failure. */
1463 DEFHOOK
1464 (legitimize_address,
1466 rtx, (rtx x, rtx oldx, enum machine_mode mode),
1467 default_legitimize_address)
1469 /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */
1470 DEFHOOK
1471 (delegitimize_address,
1473 rtx, (rtx x),
1474 delegitimize_mem_from_attrs)
1476 /* Given an RTX, return true if it is not ok to emit it into debug info
1477 section. */
1478 DEFHOOK
1479 (const_not_ok_for_debug_p,
1481 bool, (rtx x),
1482 hook_bool_rtx_false)
1484 /* Given an address RTX, say whether it is valid. */
1485 DEFHOOK
1486 (legitimate_address_p,
1488 bool, (enum machine_mode mode, rtx x, bool strict),
1489 default_legitimate_address_p)
1491 /* True if the given constant can be put into an object_block. */
1492 DEFHOOK
1493 (use_blocks_for_constant_p,
1495 bool, (enum machine_mode mode, const_rtx x),
1496 hook_bool_mode_const_rtx_false)
1498 /* True if the given decl can be put into an object_block. */
1499 DEFHOOK
1500 (use_blocks_for_decl_p,
1502 bool, (const_tree decl),
1503 hook_bool_const_tree_true)
1505 /* The minimum and maximum byte offsets for anchored addresses. */
1506 DEFHOOKPOD
1507 (min_anchor_offset,
1509 HOST_WIDE_INT, 0)
1511 DEFHOOKPOD
1512 (max_anchor_offset,
1514 HOST_WIDE_INT, 0)
1516 /* True if section anchors can be used to access the given symbol. */
1517 DEFHOOK
1518 (use_anchors_for_symbol_p,
1520 bool, (const_rtx x),
1521 default_use_anchors_for_symbol_p)
1523 /* True if it is OK to do sibling call optimization for the specified
1524 call expression EXP. DECL will be the called function, or NULL if
1525 this is an indirect call. */
1526 DEFHOOK
1527 (function_ok_for_sibcall,
1529 bool, (tree decl, tree exp),
1530 hook_bool_tree_tree_false)
1532 /* Establish appropriate back-end context for processing the function
1533 FNDECL. The argument might be NULL to indicate processing at top
1534 level, outside of any function scope. */
1535 DEFHOOK
1536 (set_current_function,
1538 void, (tree decl), hook_void_tree)
1540 /* True if EXP should be placed in a "small data" section. */
1541 DEFHOOK
1542 (in_small_data_p,
1544 bool, (const_tree exp),
1545 hook_bool_const_tree_false)
1547 /* True if EXP names an object for which name resolution must resolve
1548 to the current executable or shared library. */
1549 DEFHOOK
1550 (binds_local_p,
1552 bool, (const_tree exp),
1553 default_binds_local_p)
1555 /* Check if profiling code is before or after prologue. */
1556 DEFHOOK
1557 (profile_before_prologue,
1558 "It returns true if target wants profile code emitted before prologue.\n\n\
1559 The default version of this hook use the target macro\n\
1560 @code{PROFILE_BEFORE_PROLOGUE}.",
1561 bool, (void),
1562 default_profile_before_prologue)
1564 /* Modify and return the identifier of a DECL's external name,
1565 originally identified by ID, as required by the target,
1566 (eg, append @nn to windows32 stdcall function names).
1567 The default is to return ID without modification. */
1568 DEFHOOK
1569 (mangle_decl_assembler_name,
1571 tree, (tree decl, tree id),
1572 default_mangle_decl_assembler_name)
1574 /* Do something target-specific to record properties of the DECL into
1575 the associated SYMBOL_REF. */
1576 DEFHOOK
1577 (encode_section_info,
1579 void, (tree decl, rtx rtl, int new_decl_p),
1580 default_encode_section_info)
1582 /* Undo the effects of encode_section_info on the symbol string. */
1583 DEFHOOK
1584 (strip_name_encoding,
1586 const char *, (const char *name),
1587 default_strip_name_encoding)
1589 /* If shift optabs for MODE are known to always truncate the shift count,
1590 return the mask that they apply. Return 0 otherwise. */
1591 DEFHOOK
1592 (shift_truncation_mask,
1594 unsigned HOST_WIDE_INT, (enum machine_mode mode),
1595 default_shift_truncation_mask)
1597 /* Return the number of divisions in the given MODE that should be present,
1598 so that it is profitable to turn the division into a multiplication by
1599 the reciprocal. */
1600 DEFHOOK
1601 (min_divisions_for_recip_mul,
1603 unsigned int, (enum machine_mode mode),
1604 default_min_divisions_for_recip_mul)
1606 /* If the representation of integral MODE is such that values are
1607 always sign-extended to a wider mode MODE_REP then return
1608 SIGN_EXTEND. Return UNKNOWN otherwise. */
1609 /* Note that the return type ought to be RTX_CODE, but that's not
1610 necessarily defined at this point. */
1611 DEFHOOK
1612 (mode_rep_extended,
1614 int, (enum machine_mode mode, enum machine_mode rep_mode),
1615 default_mode_rep_extended)
1617 /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */
1618 DEFHOOK
1619 (valid_pointer_mode,
1621 bool, (enum machine_mode mode),
1622 default_valid_pointer_mode)
1624 /* Disambiguate with errno. */
1625 DEFHOOK
1626 (ref_may_alias_errno,
1627 "Define this to return nonzero if the memory reference @var{ref}\
1628 may alias with the system C library errno location. The default\
1629 version of this hook assumes the system C library errno location\
1630 is either a declaration of type int or accessed by dereferencing\
1631 a pointer to int.",
1632 bool, (struct ao_ref_s *ref),
1633 default_ref_may_alias_errno)
1635 /* Support for named address spaces. */
1636 #undef HOOK_PREFIX
1637 #define HOOK_PREFIX "TARGET_ADDR_SPACE_"
1638 HOOK_VECTOR (TARGET_ADDR_SPACE_HOOKS, addr_space)
1640 /* MODE to use for a pointer into another address space. */
1641 DEFHOOK
1642 (pointer_mode,
1644 enum machine_mode, (addr_space_t address_space),
1645 default_addr_space_pointer_mode)
1647 /* MODE to use for an address in another address space. */
1648 DEFHOOK
1649 (address_mode,
1651 enum machine_mode, (addr_space_t address_space),
1652 default_addr_space_address_mode)
1654 /* True if MODE is valid for a pointer in __attribute__((mode("MODE")))
1655 in another address space. */
1656 DEFHOOK
1657 (valid_pointer_mode,
1659 bool, (enum machine_mode mode, addr_space_t as),
1660 default_addr_space_valid_pointer_mode)
1662 /* True if an address is a valid memory address to a given named address
1663 space for a given mode. */
1664 DEFHOOK
1665 (legitimate_address_p,
1667 bool, (enum machine_mode mode, rtx exp, bool strict, addr_space_t as),
1668 default_addr_space_legitimate_address_p)
1670 /* Return an updated address to convert an invalid pointer to a named
1671 address space to a valid one. If NULL_RTX is returned use machine
1672 independent methods to make the address valid. */
1673 DEFHOOK
1674 (legitimize_address,
1676 rtx, (rtx x, rtx oldx, enum machine_mode mode, addr_space_t as),
1677 default_addr_space_legitimize_address)
1679 /* True if one named address space is a subset of another named address. */
1680 DEFHOOK
1681 (subset_p,
1683 bool, (addr_space_t subset, addr_space_t superset),
1684 default_addr_space_subset_p)
1686 /* Function to convert an rtl expression from one address space to another. */
1687 DEFHOOK
1688 (convert,
1690 rtx, (rtx op, tree from_type, tree to_type),
1691 default_addr_space_convert)
1693 HOOK_VECTOR_END (addr_space)
1695 #undef HOOK_PREFIX
1696 #define HOOK_PREFIX "TARGET_"
1698 /* True if MODE is valid for the target. By "valid", we mean able to
1699 be manipulated in non-trivial ways. In particular, this means all
1700 the arithmetic is supported. */
1701 DEFHOOK
1702 (scalar_mode_supported_p,
1704 bool, (enum machine_mode mode),
1705 default_scalar_mode_supported_p)
1707 /* Similarly for vector modes. "Supported" here is less strict. At
1708 least some operations are supported; need to check optabs or builtins
1709 for further details. */
1710 DEFHOOK
1711 (vector_mode_supported_p,
1713 bool, (enum machine_mode mode),
1714 hook_bool_mode_false)
1716 DEFHOOK
1717 (vector_alignment,
1718 "This hook can be used to define the alignment for a vector of type\n\
1719 @var{type}, in order to comply with a platform ABI. The default is to\n\
1720 require natural alignment for vector types. The alignment returned by\n\
1721 this hook must be a power-of-two multiple of the default alignment of\n\
1722 the vector element type.",
1723 HOST_WIDE_INT, (const_tree type),
1724 default_vector_alignment)
1726 /* True if we should try to use a scalar mode to represent an array,
1727 overriding the usual MAX_FIXED_MODE limit. */
1728 DEFHOOK
1729 (array_mode_supported_p,
1730 "Return true if GCC should try to use a scalar mode to store an array\n\
1731 of @var{nelems} elements, given that each element has mode @var{mode}.\n\
1732 Returning true here overrides the usual @code{MAX_FIXED_MODE} limit\n\
1733 and allows GCC to use any defined integer mode.\n\
1735 One use of this hook is to support vector load and store operations\n\
1736 that operate on several homogeneous vectors. For example, ARM NEON\n\
1737 has operations like:\n\
1739 @smallexample\n\
1740 int8x8x3_t vld3_s8 (const int8_t *)\n\
1741 @end smallexample\n\
1743 where the return type is defined as:\n\
1745 @smallexample\n\
1746 typedef struct int8x8x3_t\n\
1747 @{\n\
1748 int8x8_t val[3];\n\
1749 @} int8x8x3_t;\n\
1750 @end smallexample\n\
1752 If this hook allows @code{val} to have a scalar mode, then\n\
1753 @code{int8x8x3_t} can have the same mode. GCC can then store\n\
1754 @code{int8x8x3_t}s in registers rather than forcing them onto the stack.",
1755 bool, (enum machine_mode mode, unsigned HOST_WIDE_INT nelems),
1756 hook_bool_mode_uhwi_false)
1758 /* Compute cost of moving data from a register of class FROM to one of
1759 TO, using MODE. */
1760 DEFHOOK
1761 (register_move_cost,
1763 int, (enum machine_mode mode, reg_class_t from, reg_class_t to),
1764 default_register_move_cost)
1766 /* Compute cost of moving registers to/from memory. */
1767 /* ??? Documenting the argument types for this hook requires a GFDL
1768 license grant. Also, the documentation uses a different name for RCLASS. */
1769 DEFHOOK
1770 (memory_move_cost,
1772 int, (enum machine_mode mode, reg_class_t rclass, bool in),
1773 default_memory_move_cost)
1775 /* True for MODE if the target expects that registers in this mode will
1776 be allocated to registers in a small register class. The compiler is
1777 allowed to use registers explicitly used in the rtl as spill registers
1778 but it should prevent extending the lifetime of these registers. */
1779 DEFHOOK
1780 (small_register_classes_for_mode_p,
1782 bool, (enum machine_mode mode),
1783 hook_bool_mode_false)
1785 /* Register number for a flags register. Only needs to be defined if the
1786 target is constrainted to use post-reload comparison elimination. */
1787 DEFHOOKPOD
1788 (flags_regnum,
1789 "If the target has a dedicated flags register, and it needs to use the\
1790 post-reload comparison elimination pass, then this value should be set\
1791 appropriately.",
1792 unsigned int, INVALID_REGNUM)
1794 /* Compute a (partial) cost for rtx X. Return true if the complete
1795 cost has been computed, and false if subexpressions should be
1796 scanned. In either case, *TOTAL contains the cost result. */
1797 /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's
1798 not necessarily defined at this point. */
1799 DEFHOOK
1800 (rtx_costs,
1802 bool, (rtx x, int code, int outer_code, int opno, int *total, bool speed),
1803 hook_bool_rtx_int_int_int_intp_bool_false)
1805 /* Compute the cost of X, used as an address. Never called with
1806 invalid addresses. */
1807 DEFHOOK
1808 (address_cost,
1810 int, (rtx address, enum machine_mode mode, addr_space_t as, bool speed),
1811 default_address_cost)
1813 /* Return where to allocate pseudo for a given hard register initial value. */
1814 DEFHOOK
1815 (allocate_initial_value,
1817 rtx, (rtx hard_reg), NULL)
1819 /* Return nonzero if evaluating UNSPEC[_VOLATILE] X might cause a trap.
1820 FLAGS has the same meaning as in rtlanal.c: may_trap_p_1. */
1821 DEFHOOK
1822 (unspec_may_trap_p,
1824 int, (const_rtx x, unsigned flags),
1825 default_unspec_may_trap_p)
1827 /* Given a register, this hook should return a parallel of registers
1828 to represent where to find the register pieces. Define this hook
1829 if the register and its mode are represented in Dwarf in
1830 non-contiguous locations, or if the register should be
1831 represented in more than one register in Dwarf. Otherwise, this
1832 hook should return NULL_RTX. */
1833 DEFHOOK
1834 (dwarf_register_span,
1836 rtx, (rtx reg),
1837 hook_rtx_rtx_null)
1839 /* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
1840 entries not corresponding directly to registers below
1841 FIRST_PSEUDO_REGISTER, this hook should generate the necessary
1842 code, given the address of the table. */
1843 DEFHOOK
1844 (init_dwarf_reg_sizes_extra,
1846 void, (tree address),
1847 hook_void_tree)
1849 /* Fetch the fixed register(s) which hold condition codes, for
1850 targets where it makes sense to look for duplicate assignments to
1851 the condition codes. This should return true if there is such a
1852 register, false otherwise. The arguments should be set to the
1853 fixed register numbers. Up to two condition code registers are
1854 supported. If there is only one for this target, the int pointed
1855 at by the second argument should be set to -1. */
1856 DEFHOOK
1857 (fixed_condition_code_regs,
1859 bool, (unsigned int *p1, unsigned int *p2),
1860 hook_bool_uintp_uintp_false)
1862 /* If two condition code modes are compatible, return a condition
1863 code mode which is compatible with both, such that a comparison
1864 done in the returned mode will work for both of the original
1865 modes. If the condition code modes are not compatible, return
1866 VOIDmode. */
1867 DEFHOOK
1868 (cc_modes_compatible,
1870 enum machine_mode, (enum machine_mode m1, enum machine_mode m2),
1871 default_cc_modes_compatible)
1873 /* Do machine-dependent code transformations. Called just before
1874 delayed-branch scheduling. */
1875 DEFHOOK
1876 (machine_dependent_reorg,
1878 void, (void), NULL)
1880 /* Create the __builtin_va_list type. */
1881 DEFHOOK
1882 (build_builtin_va_list,
1884 tree, (void),
1885 std_build_builtin_va_list)
1887 /* Enumerate the va list variants. */
1888 DEFHOOK
1889 (enum_va_list_p,
1891 int, (int idx, const char **pname, tree *ptree),
1892 NULL)
1894 /* Get the cfun/fndecl calling abi __builtin_va_list type. */
1895 DEFHOOK
1896 (fn_abi_va_list,
1898 tree, (tree fndecl),
1899 std_fn_abi_va_list)
1901 /* Get the __builtin_va_list type dependent on input type. */
1902 DEFHOOK
1903 (canonical_va_list_type,
1905 tree, (tree type),
1906 std_canonical_va_list_type)
1908 /* ??? Documenting this hook requires a GFDL license grant. */
1909 DEFHOOK_UNDOC
1910 (expand_builtin_va_start,
1911 "Expand the @code{__builtin_va_start} builtin.",
1912 void, (tree valist, rtx nextarg), NULL)
1914 /* Gimplifies a VA_ARG_EXPR. */
1915 DEFHOOK
1916 (gimplify_va_arg_expr,
1918 tree, (tree valist, tree type, gimple_seq *pre_p, gimple_seq *post_p),
1919 std_gimplify_va_arg_expr)
1921 /* Validity-checking routines for PCH files, target-specific.
1922 get_pch_validity returns a pointer to the data to be stored,
1923 and stores the size in its argument. pch_valid_p gets the same
1924 information back and returns NULL if the PCH is valid,
1925 or an error message if not. */
1926 DEFHOOK
1927 (get_pch_validity,
1929 void *, (size_t *sz),
1930 default_get_pch_validity)
1932 DEFHOOK
1933 (pch_valid_p,
1935 const char *, (const void *data, size_t sz),
1936 default_pch_valid_p)
1938 DEFHOOK
1939 (prepare_pch_save,
1940 "Called before writing out a PCH file. If the target has some\n\
1941 garbage-collected data that needs to be in a particular state on PCH loads,\n\
1942 it can use this hook to enforce that state. Very few targets need\n\
1943 to do anything here.",
1944 void, (void),
1945 hook_void_void)
1947 /* If nonnull, this function checks whether a PCH file with the
1948 given set of target flags can be used. It returns NULL if so,
1949 otherwise it returns an error message. */
1950 DEFHOOK
1951 (check_pch_target_flags,
1953 const char *, (int pch_flags), NULL)
1955 /* True if the compiler should give an enum type only as many
1956 bytes as it takes to represent the range of possible values of
1957 that type. */
1958 DEFHOOK
1959 (default_short_enums,
1961 bool, (void),
1962 hook_bool_void_false)
1964 /* This target hook returns an rtx that is used to store the address
1965 of the current frame into the built-in setjmp buffer. */
1966 DEFHOOK
1967 (builtin_setjmp_frame_value,
1969 rtx, (void),
1970 default_builtin_setjmp_frame_value)
1972 /* This target hook should add STRING_CST trees for any hard regs
1973 the port wishes to automatically clobber for an asm. */
1974 DEFHOOK
1975 (md_asm_clobbers,
1977 tree, (tree outputs, tree inputs, tree clobbers),
1978 hook_tree_tree_tree_tree_3rd_identity)
1980 /* This target hook allows the backend to specify a calling convention
1981 in the debug information. This function actually returns an
1982 enum dwarf_calling_convention, but because of forward declarations
1983 and not wanting to include dwarf2.h everywhere target.h is included
1984 the function is being declared as an int. */
1985 DEFHOOK
1986 (dwarf_calling_convention,
1988 int, (const_tree function),
1989 hook_int_const_tree_0)
1991 /* This target hook allows the backend to emit frame-related insns that
1992 contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info
1993 engine will invoke it on insns of the form
1994 (set (reg) (unspec [...] UNSPEC_INDEX))
1996 (set (reg) (unspec_volatile [...] UNSPECV_INDEX))
1997 to let the backend emit the call frame instructions. */
1998 DEFHOOK
1999 (dwarf_handle_frame_unspec,
2001 void, (const char *label, rtx pattern, int index), NULL)
2003 /* ??? Documenting this hook requires a GFDL license grant. */
2004 DEFHOOK_UNDOC
2005 (stdarg_optimize_hook,
2006 "Perform architecture specific checking of statements gimplified\
2007 from @code{VA_ARG_EXPR}. @var{stmt} is the statement. Returns true if\
2008 the statement doesn't need to be checked for @code{va_list} references.",
2009 bool, (struct stdarg_info *ai, const_gimple stmt), NULL)
2011 /* This target hook allows the operating system to override the DECL
2012 that represents the external variable that contains the stack
2013 protection guard variable. The type of this DECL is ptr_type_node. */
2014 DEFHOOK
2015 (stack_protect_guard,
2017 tree, (void),
2018 default_stack_protect_guard)
2020 /* This target hook allows the operating system to override the CALL_EXPR
2021 that is invoked when a check vs the guard variable fails. */
2022 DEFHOOK
2023 (stack_protect_fail,
2025 tree, (void),
2026 default_external_stack_protect_fail)
2028 /* Returns NULL if target supports the insn within a doloop block,
2029 otherwise it returns an error message. */
2030 DEFHOOK
2031 (invalid_within_doloop,
2033 const char *, (const_rtx insn),
2034 default_invalid_within_doloop)
2036 /* Returns true for a legitimate combined insn. */
2037 DEFHOOK
2038 (legitimate_combined_insn,
2039 "Take an instruction in @var{insn} and return @code{false} if the instruction\
2040 is not appropriate as a combination of two or more instructions. The\
2041 default is to accept all instructions.",
2042 bool, (rtx insn),
2043 hook_bool_rtx_true)
2045 DEFHOOK
2046 (valid_dllimport_attribute_p,
2047 "@var{decl} is a variable or function with @code{__attribute__((dllimport))}\
2048 specified. Use this hook if the target needs to add extra validation\
2049 checks to @code{handle_dll_attribute}.",
2050 bool, (const_tree decl),
2051 hook_bool_const_tree_true)
2053 /* If non-zero, align constant anchors in CSE to a multiple of this
2054 value. */
2055 DEFHOOKPOD
2056 (const_anchor,
2058 unsigned HOST_WIDE_INT, 0)
2060 /* Defines, which target-dependent bits (upper 16) are used by port */
2061 DEFHOOK
2062 (memmodel_check,
2064 unsigned HOST_WIDE_INT, (unsigned HOST_WIDE_INT val), NULL)
2066 /* Defines an offset bitwise ored into shifted address to get corresponding
2067 Address Sanitizer shadow address, or -1 if Address Sanitizer is not
2068 supported by the target. */
2069 DEFHOOK
2070 (asan_shadow_offset,
2071 "Return the offset bitwise ored into shifted address to get corresponding\n\
2072 Address Sanitizer shadow memory address. NULL if Address Sanitizer is not\n\
2073 supported by the target.",
2074 unsigned HOST_WIDE_INT, (void),
2075 NULL)
2077 /* Functions relating to calls - argument passing, returns, etc. */
2078 /* Members of struct call have no special macro prefix. */
2079 HOOK_VECTOR (TARGET_CALLS, calls)
2081 DEFHOOK
2082 (promote_function_mode,
2084 enum machine_mode, (const_tree type, enum machine_mode mode, int *punsignedp,
2085 const_tree funtype, int for_return),
2086 default_promote_function_mode)
2088 DEFHOOK
2089 (promote_prototypes,
2091 bool, (const_tree fntype),
2092 hook_bool_const_tree_false)
2094 DEFHOOK
2095 (struct_value_rtx,
2097 rtx, (tree fndecl, int incoming),
2098 hook_rtx_tree_int_null)
2099 DEFHOOK
2100 (return_in_memory,
2102 bool, (const_tree type, const_tree fntype),
2103 default_return_in_memory)
2105 DEFHOOK
2106 (return_in_msb,
2108 bool, (const_tree type),
2109 hook_bool_const_tree_false)
2111 /* Return true if a parameter must be passed by reference. TYPE may
2112 be null if this is a libcall. CA may be null if this query is
2113 from __builtin_va_arg. */
2114 DEFHOOK
2115 (pass_by_reference,
2117 bool,
2118 (cumulative_args_t cum, enum machine_mode mode, const_tree type, bool named),
2119 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
2121 DEFHOOK
2122 (expand_builtin_saveregs,
2124 rtx, (void),
2125 default_expand_builtin_saveregs)
2127 /* Returns pretend_argument_size. */
2128 DEFHOOK
2129 (setup_incoming_varargs,
2131 void, (cumulative_args_t args_so_far, enum machine_mode mode, tree type,
2132 int *pretend_args_size, int second_time),
2133 default_setup_incoming_varargs)
2135 DEFHOOK
2136 (strict_argument_naming,
2138 bool, (cumulative_args_t ca),
2139 hook_bool_CUMULATIVE_ARGS_false)
2141 /* Returns true if we should use
2142 targetm.calls.setup_incoming_varargs() and/or
2143 targetm.calls.strict_argument_naming(). */
2144 DEFHOOK
2145 (pretend_outgoing_varargs_named,
2147 bool, (cumulative_args_t ca),
2148 default_pretend_outgoing_varargs_named)
2150 /* Given a complex type T, return true if a parameter of type T
2151 should be passed as two scalars. */
2152 DEFHOOK
2153 (split_complex_arg,
2155 bool, (const_tree type), NULL)
2157 /* Return true if type T, mode MODE, may not be passed in registers,
2158 but must be passed on the stack. */
2159 /* ??? This predicate should be applied strictly after pass-by-reference.
2160 Need audit to verify that this is the case. */
2161 DEFHOOK
2162 (must_pass_in_stack,
2164 bool, (enum machine_mode mode, const_tree type),
2165 must_pass_in_stack_var_size_or_pad)
2167 /* Return true if type TYPE, mode MODE, which is passed by reference,
2168 should have the object copy generated by the callee rather than
2169 the caller. It is never called for TYPE requiring constructors. */
2170 DEFHOOK
2171 (callee_copies,
2173 bool,
2174 (cumulative_args_t cum, enum machine_mode mode, const_tree type, bool named),
2175 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
2177 /* Return zero for arguments passed entirely on the stack or entirely
2178 in registers. If passed in both, return the number of bytes passed
2179 in registers; the balance is therefore passed on the stack. */
2180 DEFHOOK
2181 (arg_partial_bytes,
2183 int, (cumulative_args_t cum, enum machine_mode mode, tree type, bool named),
2184 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0)
2186 /* Update the state in CA to advance past an argument in the
2187 argument list. The values MODE, TYPE, and NAMED describe that
2188 argument. */
2189 DEFHOOK
2190 (function_arg_advance,
2192 void,
2193 (cumulative_args_t ca, enum machine_mode mode, const_tree type, bool named),
2194 default_function_arg_advance)
2196 /* Return zero if the argument described by the state of CA should
2197 be placed on a stack, or a hard register in which to store the
2198 argument. The values MODE, TYPE, and NAMED describe that
2199 argument. */
2200 DEFHOOK
2201 (function_arg,
2203 rtx, (cumulative_args_t ca, enum machine_mode mode, const_tree type,
2204 bool named),
2205 default_function_arg)
2207 /* Likewise, but for machines with register windows. Return the
2208 location where the argument will appear to the callee. */
2209 DEFHOOK
2210 (function_incoming_arg,
2212 rtx, (cumulative_args_t ca, enum machine_mode mode, const_tree type,
2213 bool named),
2214 default_function_incoming_arg)
2216 DEFHOOK
2217 (function_arg_boundary,
2219 unsigned int, (enum machine_mode mode, const_tree type),
2220 default_function_arg_boundary)
2222 DEFHOOK
2223 (function_arg_round_boundary,
2224 "Normally, the size of an argument is rounded up to @code{PARM_BOUNDARY},\n\
2225 which is the default value for this hook. You can define this hook to\n\
2226 return a different value if an argument size must be rounded to a larger\n\
2227 value.",
2228 unsigned int, (enum machine_mode mode, const_tree type),
2229 default_function_arg_round_boundary)
2231 /* Return the diagnostic message string if function without a prototype
2232 is not allowed for this 'val' argument; NULL otherwise. */
2233 DEFHOOK
2234 (invalid_arg_for_unprototyped_fn,
2236 const char *, (const_tree typelist, const_tree funcdecl, const_tree val),
2237 hook_invalid_arg_for_unprototyped_fn)
2239 /* Return an rtx for the return value location of the function
2240 specified by FN_DECL_OR_TYPE with a return type of RET_TYPE. */
2241 DEFHOOK
2242 (function_value,
2244 rtx, (const_tree ret_type, const_tree fn_decl_or_type, bool outgoing),
2245 default_function_value)
2247 /* Return the rtx for the result of a libcall of mode MODE,
2248 calling the function FN_NAME. */
2249 DEFHOOK
2250 (libcall_value,
2252 rtx, (enum machine_mode mode, const_rtx fun),
2253 default_libcall_value)
2255 /* Return true if REGNO is a possible register number for
2256 a function value as seen by the caller. */
2257 DEFHOOK
2258 (function_value_regno_p,
2260 bool, (const unsigned int regno),
2261 default_function_value_regno_p)
2263 /* ??? Documenting this hook requires a GFDL license grant. */
2264 DEFHOOK_UNDOC
2265 (internal_arg_pointer,
2266 "Return an rtx for the argument pointer incoming to the\
2267 current function.",
2268 rtx, (void),
2269 default_internal_arg_pointer)
2271 /* Update the current function stack boundary if needed. */
2272 DEFHOOK
2273 (update_stack_boundary,
2275 void, (void), NULL)
2277 /* Handle stack alignment and return an rtx for Dynamic Realign
2278 Argument Pointer if necessary. */
2279 DEFHOOK
2280 (get_drap_rtx,
2282 rtx, (void), NULL)
2284 /* Return true if all function parameters should be spilled to the
2285 stack. */
2286 DEFHOOK
2287 (allocate_stack_slots_for_args,
2289 bool, (void),
2290 hook_bool_void_true)
2292 /* Return an rtx for the static chain for FNDECL. If INCOMING_P is true,
2293 then it should be for the callee; otherwise for the caller. */
2294 DEFHOOK
2295 (static_chain,
2297 rtx, (const_tree fndecl, bool incoming_p),
2298 default_static_chain)
2300 /* Fill in the trampoline at MEM with a call to FNDECL and a
2301 static chain value of CHAIN. */
2302 DEFHOOK
2303 (trampoline_init,
2305 void, (rtx m_tramp, tree fndecl, rtx static_chain),
2306 default_trampoline_init)
2308 /* Adjust the address of the trampoline in a target-specific way. */
2309 DEFHOOK
2310 (trampoline_adjust_address,
2312 rtx, (rtx addr), NULL)
2314 /* Return the number of bytes of its own arguments that a function
2315 pops on returning, or 0 if the function pops no arguments and the
2316 caller must therefore pop them all after the function returns. */
2317 /* ??? tm.texi has no types for the parameters. */
2318 DEFHOOK
2319 (return_pops_args,
2321 int, (tree fundecl, tree funtype, int size),
2322 default_return_pops_args)
2324 /* Return a mode wide enough to copy any function value that might be
2325 returned. */
2326 DEFHOOK
2327 (get_raw_result_mode,
2328 "This target hook returns the mode to be used when accessing raw return\
2329 registers in @code{__builtin_return}. Define this macro if the value\
2330 in @var{reg_raw_mode} is not correct.",
2331 enum machine_mode, (int regno),
2332 default_get_reg_raw_mode)
2334 /* Return a mode wide enough to copy any argument value that might be
2335 passed. */
2336 DEFHOOK
2337 (get_raw_arg_mode,
2338 "This target hook returns the mode to be used when accessing raw argument\
2339 registers in @code{__builtin_apply_args}. Define this macro if the value\
2340 in @var{reg_raw_mode} is not correct.",
2341 enum machine_mode, (int regno),
2342 default_get_reg_raw_mode)
2344 HOOK_VECTOR_END (calls)
2346 /* Return the diagnostic message string if conversion from FROMTYPE
2347 to TOTYPE is not allowed, NULL otherwise. */
2348 DEFHOOK
2349 (invalid_conversion,
2351 const char *, (const_tree fromtype, const_tree totype),
2352 hook_constcharptr_const_tree_const_tree_null)
2354 /* Return the diagnostic message string if the unary operation OP is
2355 not permitted on TYPE, NULL otherwise. */
2356 DEFHOOK
2357 (invalid_unary_op,
2359 const char *, (int op, const_tree type),
2360 hook_constcharptr_int_const_tree_null)
2362 /* Return the diagnostic message string if the binary operation OP
2363 is not permitted on TYPE1 and TYPE2, NULL otherwise. */
2364 DEFHOOK
2365 (invalid_binary_op,
2367 const char *, (int op, const_tree type1, const_tree type2),
2368 hook_constcharptr_int_const_tree_const_tree_null)
2370 /* Return the diagnostic message string if TYPE is not valid as a
2371 function parameter type, NULL otherwise. */
2372 DEFHOOK
2373 (invalid_parameter_type,
2375 const char *, (const_tree type),
2376 hook_constcharptr_const_tree_null)
2378 /* Return the diagnostic message string if TYPE is not valid as a
2379 function return type, NULL otherwise. */
2380 DEFHOOK
2381 (invalid_return_type,
2383 const char *, (const_tree type),
2384 hook_constcharptr_const_tree_null)
2386 /* If values of TYPE are promoted to some other type when used in
2387 expressions (analogous to the integer promotions), return that type,
2388 or NULL_TREE otherwise. */
2389 DEFHOOK
2390 (promoted_type,
2392 tree, (const_tree type),
2393 hook_tree_const_tree_null)
2395 /* Convert EXPR to TYPE, if target-specific types with special conversion
2396 rules are involved. Return the converted expression, or NULL to apply
2397 the standard conversion rules. */
2398 DEFHOOK
2399 (convert_to_type,
2401 tree, (tree type, tree expr),
2402 hook_tree_tree_tree_null)
2404 /* Return true if we use LRA instead of reload. */
2405 DEFHOOK
2406 (lra_p,
2407 "A target hook which returns true if we use LRA instead of reload pass.\
2408 It means that LRA was ported to the target.\
2410 The default version of this target hook returns always false.",
2411 bool, (void),
2412 default_lra_p)
2414 /* Return register priority of given hard regno for the current target. */
2415 DEFHOOK
2416 (register_priority,
2417 "A target hook which returns the register priority number to which the\
2418 register @var{hard_regno} belongs to. The bigger the number, the\
2419 more preferable the hard register usage (when all other conditions are\
2420 the same). This hook can be used to prefer some hard register over\
2421 others in LRA. For example, some x86-64 register usage needs\
2422 additional prefix which makes instructions longer. The hook can\
2423 return lower priority number for such registers make them less favorable\
2424 and as result making the generated code smaller.\
2426 The default version of this target hook returns always zero.",
2427 int, (int),
2428 default_register_priority)
2430 /* Return true if maximal address displacement can be different. */
2431 DEFHOOK
2432 (different_addr_displacement_p,
2433 "A target hook which returns true if an address with the same structure\
2434 can have different maximal legitimate displacement. For example, the\
2435 displacement can depend on memory mode or on operand combinations in\
2436 the insn.\
2438 The default version of this target hook returns always false.",
2439 bool, (void),
2440 default_different_addr_displacement_p)
2442 /* Determine class for spilling pseudos of given mode into registers
2443 instead of memory. */
2444 DEFHOOK
2445 (spill_class,
2446 "This hook defines a class of registers which could be used for spilling\
2447 pseudos of the given mode and class, or @code{NO_REGS} if only memory\
2448 should be used. Not defining this hook is equivalent to returning\
2449 @code{NO_REGS} for all inputs.",
2450 reg_class_t, (reg_class_t, enum machine_mode),
2451 NULL)
2453 /* True if a structure, union or array with MODE containing FIELD should
2454 be accessed using BLKmode. */
2455 DEFHOOK
2456 (member_type_forces_blk,
2458 bool, (const_tree field, enum machine_mode mode),
2459 default_member_type_forces_blk)
2461 /* Return the class for a secondary reload, and fill in extra information. */
2462 DEFHOOK
2463 (secondary_reload,
2465 reg_class_t,
2466 (bool in_p, rtx x, reg_class_t reload_class, enum machine_mode reload_mode,
2467 secondary_reload_info *sri),
2468 default_secondary_reload)
2470 /* Given an rtx X being reloaded into a reg required to be in class CLASS,
2471 return the class of reg to actually use. */
2472 DEFHOOK
2473 (preferred_reload_class,
2475 reg_class_t,
2476 (rtx x, reg_class_t rclass),
2477 default_preferred_reload_class)
2479 /* Like TARGET_PREFERRED_RELOAD_CLASS, but for output reloads instead of
2480 input reloads. */
2481 DEFHOOK
2482 (preferred_output_reload_class,
2484 reg_class_t,
2485 (rtx x, reg_class_t rclass),
2486 default_preferred_output_reload_class)
2488 DEFHOOK
2489 (class_likely_spilled_p,
2491 bool, (reg_class_t rclass),
2492 default_class_likely_spilled_p)
2494 /* Return the maximum number of consecutive registers
2495 needed to represent mode MODE in a register of class RCLASS. */
2496 DEFHOOK
2497 (class_max_nregs,
2499 unsigned char, (reg_class_t rclass, enum machine_mode mode),
2500 default_class_max_nregs)
2502 DEFHOOK
2503 (preferred_rename_class,
2504 "A target hook that places additional preference on the register\
2505 class to use when it is necessary to rename a register in class\
2506 @var{rclass} to another class, or perhaps @var{NO_REGS}, if no\
2507 preferred register class is found or hook @code{preferred_rename_class}\
2508 is not implemented.\
2509 Sometimes returning a more restrictive class makes better code. For\
2510 example, on ARM, thumb-2 instructions using @code{LO_REGS} may be\
2511 smaller than instructions using @code{GENERIC_REGS}. By returning\
2512 @code{LO_REGS} from @code{preferred_rename_class}, code size can\
2513 be reduced.",
2514 reg_class_t, (reg_class_t rclass),
2515 default_preferred_rename_class)
2517 /* This target hook allows the backend to perform additional
2518 processing while initializing for variable expansion. */
2519 DEFHOOK
2520 (expand_to_rtl_hook,
2522 void, (void),
2523 hook_void_void)
2525 /* This target hook allows the backend to perform additional
2526 instantiations on rtx that are not actually in insns yet,
2527 but will be later. */
2528 DEFHOOK
2529 (instantiate_decls,
2531 void, (void),
2532 hook_void_void)
2534 /* Return true if is OK to use a hard register REGNO as scratch register
2535 in peephole2. */
2536 DEFHOOK
2537 (hard_regno_scratch_ok,
2539 bool, (unsigned int regno),
2540 default_hard_regno_scratch_ok)
2542 /* Return the smallest number of different values for which it is best to
2543 use a jump-table instead of a tree of conditional branches. */
2544 DEFHOOK
2545 (case_values_threshold,
2547 unsigned int, (void),
2548 default_case_values_threshold)
2550 /* Retutn true if a function must have and use a frame pointer. */
2551 DEFHOOK
2552 (frame_pointer_required,
2554 bool, (void),
2555 hook_bool_void_false)
2557 /* Returns true if the compiler is allowed to try to replace register number
2558 from-reg with register number to-reg. */
2559 DEFHOOK
2560 (can_eliminate,
2562 bool, (const int from_reg, const int to_reg),
2563 hook_bool_const_int_const_int_true)
2565 /* Modify any or all of fixed_regs, call_used_regs, global_regs,
2566 reg_names, and reg_class_contents to account of the vagaries of the
2567 target. */
2568 DEFHOOK
2569 (conditional_register_usage,
2571 void, (void),
2572 hook_void_void)
2574 /* Functions specific to the C family of frontends. */
2575 #undef HOOK_PREFIX
2576 #define HOOK_PREFIX "TARGET_C_"
2577 HOOK_VECTOR (TARGET_C, c)
2579 /* ??? Documenting this hook requires a GFDL license grant. */
2580 DEFHOOK_UNDOC
2581 (mode_for_suffix,
2582 "Return machine mode for non-standard constant literal suffix @var{c},\
2583 or VOIDmode if non-standard suffixes are unsupported.",
2584 enum machine_mode, (char c),
2585 default_mode_for_suffix)
2587 HOOK_VECTOR_END (c)
2589 /* Functions specific to the C++ frontend. */
2590 #undef HOOK_PREFIX
2591 #define HOOK_PREFIX "TARGET_CXX_"
2592 HOOK_VECTOR (TARGET_CXX, cxx)
2594 /* Return the integer type used for guard variables. */
2595 DEFHOOK
2596 (guard_type,
2598 tree, (void),
2599 default_cxx_guard_type)
2601 /* Return true if only the low bit of the guard should be tested. */
2602 DEFHOOK
2603 (guard_mask_bit,
2605 bool, (void),
2606 hook_bool_void_false)
2608 /* Returns the size of the array cookie for an array of type. */
2609 DEFHOOK
2610 (get_cookie_size,
2612 tree, (tree type),
2613 default_cxx_get_cookie_size)
2615 /* Returns true if the element size should be stored in the array cookie. */
2616 DEFHOOK
2617 (cookie_has_size,
2619 bool, (void),
2620 hook_bool_void_false)
2622 /* Allows backends to perform additional processing when
2623 deciding if a class should be exported or imported. */
2624 DEFHOOK
2625 (import_export_class,
2627 int, (tree type, int import_export), NULL)
2629 /* Returns true if constructors and destructors return "this". */
2630 DEFHOOK
2631 (cdtor_returns_this,
2633 bool, (void),
2634 hook_bool_void_false)
2636 /* Returns true if the key method for a class can be an inline
2637 function, so long as it is not declared inline in the class
2638 itself. Returning true is the behavior required by the Itanium C++ ABI. */
2639 DEFHOOK
2640 (key_method_may_be_inline,
2642 bool, (void),
2643 hook_bool_void_true)
2645 DEFHOOK
2646 (determine_class_data_visibility,
2647 "@var{decl} is a virtual table, virtual table table, typeinfo object,\
2648 or other similar implicit class data object that will be emitted with\
2649 external linkage in this translation unit. No ELF visibility has been\
2650 explicitly specified. If the target needs to specify a visibility\
2651 other than that of the containing class, use this hook to set\
2652 @code{DECL_VISIBILITY} and @code{DECL_VISIBILITY_SPECIFIED}.",
2653 void, (tree decl),
2654 hook_void_tree)
2656 /* Returns true (the default) if virtual tables and other
2657 similar implicit class data objects are always COMDAT if they
2658 have external linkage. If this hook returns false, then
2659 class data for classes whose virtual table will be emitted in
2660 only one translation unit will not be COMDAT. */
2661 DEFHOOK
2662 (class_data_always_comdat,
2664 bool, (void),
2665 hook_bool_void_true)
2667 /* Returns true (the default) if the RTTI for the basic types,
2668 which is always defined in the C++ runtime, should be COMDAT;
2669 false if it should not be COMDAT. */
2670 DEFHOOK
2671 (library_rtti_comdat,
2673 bool, (void),
2674 hook_bool_void_true)
2676 /* Returns true if __aeabi_atexit should be used to register static
2677 destructors. */
2678 DEFHOOK
2679 (use_aeabi_atexit,
2681 bool, (void),
2682 hook_bool_void_false)
2684 /* Returns true if target may use atexit in the same manner as
2685 __cxa_atexit to register static destructors. */
2686 DEFHOOK
2687 (use_atexit_for_cxa_atexit,
2689 bool, (void),
2690 hook_bool_void_false)
2692 DEFHOOK
2693 (adjust_class_at_definition,
2694 "@var{type} is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that has just\
2695 been defined. Use this hook to make adjustments to the class (eg, tweak\
2696 visibility or perform any other required target modifications).",
2697 void, (tree type),
2698 hook_void_tree)
2700 DEFHOOK
2701 (decl_mangling_context,
2702 "Return target-specific mangling context of @var{decl} or @code{NULL_TREE}.",
2703 tree, (const_tree decl),
2704 hook_tree_const_tree_null)
2706 HOOK_VECTOR_END (cxx)
2708 /* Functions and data for emulated TLS support. */
2709 #undef HOOK_PREFIX
2710 #define HOOK_PREFIX "TARGET_EMUTLS_"
2711 HOOK_VECTOR (TARGET_EMUTLS, emutls)
2713 /* Name of the address and common functions. */
2714 DEFHOOKPOD
2715 (get_address,
2717 const char *, "__builtin___emutls_get_address")
2719 DEFHOOKPOD
2720 (register_common,
2722 const char *, "__builtin___emutls_register_common")
2724 /* Prefixes for proxy variable and template. */
2725 DEFHOOKPOD
2726 (var_section,
2728 const char *, NULL)
2730 DEFHOOKPOD
2731 (tmpl_section,
2733 const char *, NULL)
2735 /* Prefixes for proxy variable and template. */
2736 DEFHOOKPOD
2737 (var_prefix,
2739 const char *, NULL)
2741 DEFHOOKPOD
2742 (tmpl_prefix,
2744 const char *, NULL)
2746 /* Function to generate field definitions of the proxy variable. */
2747 DEFHOOK
2748 (var_fields,
2750 tree, (tree type, tree *name),
2751 default_emutls_var_fields)
2753 /* Function to initialize a proxy variable. */
2754 DEFHOOK
2755 (var_init,
2757 tree, (tree var, tree decl, tree tmpl_addr),
2758 default_emutls_var_init)
2760 /* Whether we are allowed to alter the usual alignment of the
2761 proxy variable. */
2762 DEFHOOKPOD
2763 (var_align_fixed,
2765 bool, false)
2767 /* Whether we can emit debug information for TLS vars. */
2768 DEFHOOKPOD
2769 (debug_form_tls_address,
2771 bool, false)
2773 HOOK_VECTOR_END (emutls)
2775 #undef HOOK_PREFIX
2776 #define HOOK_PREFIX "TARGET_OPTION_"
2777 HOOK_VECTOR (TARGET_OPTION_HOOKS, target_option_hooks)
2779 /* Function to validate the attribute((option(...))) strings or NULL. If
2780 the option is validated, it is assumed that DECL_FUNCTION_SPECIFIC will
2781 be filled in in the function decl node. */
2782 DEFHOOK
2783 (valid_attribute_p,
2785 bool, (tree fndecl, tree name, tree args, int flags),
2786 default_target_option_valid_attribute_p)
2788 /* Function to save any extra target state in the target options structure. */
2789 DEFHOOK
2790 (save,
2792 void, (struct cl_target_option *ptr), NULL)
2794 /* Function to restore any extra target state from the target options
2795 structure. */
2796 DEFHOOK
2797 (restore,
2799 void, (struct cl_target_option *ptr), NULL)
2801 /* Function to print any extra target state from the target options
2802 structure. */
2803 DEFHOOK
2804 (print,
2806 void, (FILE *file, int indent, struct cl_target_option *ptr), NULL)
2808 /* Function to parse arguments to be validated for #pragma option, and to
2809 change the state if the options are valid. If the first argument is
2810 NULL, the second argument specifies the default options to use. Return
2811 true if the options are valid, and set the current state. */
2812 /* ??? The documentation in tm.texi is incomplete. */
2813 DEFHOOK
2814 (pragma_parse,
2816 bool, (tree args, tree pop_target),
2817 default_target_option_pragma_parse)
2819 /* Do option overrides for the target. */
2820 DEFHOOK
2821 (override,
2823 void, (void),
2824 hook_void_void)
2826 /* This function returns true if DECL1 and DECL2 are versions of the same
2827 function. DECL1 and DECL2 are function versions if and only if they
2828 have the same function signature and different target specific attributes,
2829 that is, they are compiled for different target machines. */
2830 DEFHOOK
2831 (function_versions,
2833 bool, (tree decl1, tree decl2),
2834 hook_bool_tree_tree_false)
2836 /* Function to determine if one function can inline another function. */
2837 #undef HOOK_PREFIX
2838 #define HOOK_PREFIX "TARGET_"
2839 DEFHOOK
2840 (can_inline_p,
2842 bool, (tree caller, tree callee),
2843 default_target_can_inline_p)
2845 HOOK_VECTOR_END (target_option)
2847 /* For targets that need to mark extra registers as live on entry to
2848 the function, they should define this target hook and set their
2849 bits in the bitmap passed in. */
2850 DEFHOOK
2851 (extra_live_on_entry,
2853 void, (bitmap regs),
2854 hook_void_bitmap)
2856 /* Fill in additional registers set up by prologue into a regset. */
2857 DEFHOOK
2858 (set_up_by_prologue,
2859 "This hook should add additional registers that are computed by the prologue\
2860 to the hard regset for shrink-wrapping optimization purposes.",
2861 void, (struct hard_reg_set_container *),
2862 NULL)
2864 /* For targets that have attributes that can affect whether a
2865 function's return statements need checking. For instance a 'naked'
2866 function attribute. */
2867 DEFHOOK
2868 (warn_func_return,
2869 "True if a function's return statements should be checked for matching the function's return type. This includes checking for falling off the end of a non-void function. Return false if no such check should be made.",
2870 bool, (tree),
2871 hook_bool_tree_true)
2873 /* Determine the type of unwind info to emit for debugging. */
2874 DEFHOOK
2875 (debug_unwind_info,
2877 enum unwind_info_type, (void),
2878 default_debug_unwind_info)
2880 DEFHOOKPOD
2881 (atomic_test_and_set_trueval,
2882 "This value should be set if the result written by\
2883 @code{atomic_test_and_set} is not exactly 1, i.e. the\
2884 @code{bool} @code{true}.",
2885 unsigned char, 1)
2887 /* Leave the boolean fields at the end. */
2889 /* True if we can create zeroed data by switching to a BSS section
2890 and then using ASM_OUTPUT_SKIP to allocate the space. */
2891 DEFHOOKPOD
2892 (have_switchable_bss_sections,
2894 bool, false)
2896 /* True if "native" constructors and destructors are supported,
2897 false if we're using collect2 for the job. */
2898 DEFHOOKPOD
2899 (have_ctors_dtors,
2901 bool, false)
2903 /* True if thread-local storage is supported. */
2904 DEFHOOKPOD
2905 (have_tls,
2907 bool, false)
2909 /* True if a small readonly data section is supported. */
2910 DEFHOOKPOD
2911 (have_srodata_section,
2913 bool, false)
2915 /* True if EH frame info sections should be zero-terminated. */
2916 DEFHOOKPOD
2917 (terminate_dw2_eh_frame_info,
2919 bool, true)
2921 /* True if #NO_APP should be emitted at the beginning of assembly output. */
2922 DEFHOOKPOD
2923 (asm_file_start_app_off,
2925 bool, false)
2927 /* True if output_file_directive should be called for main_input_filename
2928 at the beginning of assembly output. */
2929 DEFHOOKPOD
2930 (asm_file_start_file_directive,
2932 bool, false)
2934 /* True if the target is allowed to reorder memory accesses unless
2935 synchronization is explicitly requested. */
2936 DEFHOOKPOD
2937 (relaxed_ordering,
2939 bool, false)
2941 /* Returns true if we should generate exception tables for use with the
2942 ARM EABI. The effects the encoding of function exception specifications. */
2943 DEFHOOKPOD
2944 (arm_eabi_unwinder,
2946 bool, false)
2948 DEFHOOKPOD
2949 (want_debug_pub_sections,
2950 "True if the @code{.debug_pubtypes} and @code{.debug_pubnames} sections\
2951 should be emitted. These sections are not used on most platforms, and\
2952 in particular GDB does not use them.",
2953 bool, false)
2955 DEFHOOKPOD
2956 (force_at_comp_dir,
2957 "True if the @code{DW_AT_comp_dir} attribute should be emitted for each \
2958 compilation unit. This attribute is required for the darwin linker \
2959 to emit debug information.",
2960 bool, false)
2962 DEFHOOKPOD
2963 (delay_sched2, "True if sched2 is not to be run at its normal place. \
2964 This usually means it will be run as part of machine-specific reorg.",
2965 bool, false)
2967 DEFHOOKPOD
2968 (delay_vartrack, "True if vartrack is not to be run at its normal place. \
2969 This usually means it will be run as part of machine-specific reorg.",
2970 bool, false)
2972 /* Leave the boolean fields at the end. */
2974 /* Close the 'struct gcc_target' definition. */
2975 HOOK_VECTOR_END (C90_EMPTY_HACK)