1 /* Target hook definitions.
2 Copyright (C) 2001-2013 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU General Public License as published by the
6 Free Software Foundation; either version 3, or (at your option) any
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; see the file COPYING3. If not see
16 <http://www.gnu.org/licenses/>.
18 In other words, you are welcome to use, share and improve this program.
19 You are forbidden to forbid anyone else to use, share and improve
20 what you give them. Help stamp out software-hoarding! */
22 /* See target-hooks-macros.h for details of macros that should be
23 provided by the including file, and how to use them here. */
24 #include "target-hooks-macros.h"
27 #define HOOK_TYPE "Target Hook"
29 HOOK_VECTOR (TARGET_INITIALIZER, gcc_target)
31 /* Functions that output assembler for the target. */
32 #define HOOK_PREFIX "TARGET_ASM_"
33 HOOK_VECTOR (TARGET_ASM_OUT, asm_out)
35 /* Opening and closing parentheses for asm expression grouping. */
40 DEFHOOKPODX (close_paren, const char *, ")")
42 /* Assembler instructions for creating various kinds of integer object. */
46 const char *, "\t.byte\t")
47 DEFHOOKPOD (aligned_op, "*", struct asm_int_op, TARGET_ASM_ALIGNED_INT_OP)
48 DEFHOOKPOD (unaligned_op, "*", struct asm_int_op, TARGET_ASM_UNALIGNED_INT_OP)
50 /* The maximum number of bytes to skip when applying
51 LABEL_ALIGN_AFTER_BARRIER. */
53 (label_align_after_barrier_max_skip,
56 default_label_align_after_barrier_max_skip)
58 /* The maximum number of bytes to skip when applying
64 default_loop_align_max_skip)
66 /* The maximum number of bytes to skip when applying
69 (label_align_max_skip,
72 default_label_align_max_skip)
74 /* The maximum number of bytes to skip when applying
80 default_jump_align_max_skip)
82 /* Try to output the assembler code for an integer object whose
83 value is given by X. SIZE is the size of the object in bytes and
84 ALIGNED_P indicates whether it is aligned. Return true if
85 successful. Only handles cases for which BYTE_OP, ALIGNED_OP
86 and UNALIGNED_OP are NULL. */
90 /* Only handles cases for which BYTE_OP, ALIGNED_OP and UNALIGNED_OP are
92 bool, (rtx x, unsigned int size, int aligned_p),
93 default_assemble_integer)
95 /* Output code that will globalize a label. */
99 void, (FILE *stream, const char *name),
100 default_globalize_label)
102 /* Output code that will globalize a declaration. */
104 (globalize_decl_name,
106 void, (FILE *stream, tree decl), default_globalize_decl_name)
108 /* Output code that will emit a label for unwind info, if this
109 target requires such labels. Second argument is the decl the
110 unwind info is associated with, third is a boolean: true if
111 this is for exception handling, fourth is a boolean: true if
112 this is only a placeholder for an omitted FDE. */
116 void, (FILE *stream, tree decl, int for_eh, int empty),
117 default_emit_unwind_label)
119 /* Output code that will emit a label to divide up the exception table. */
121 (emit_except_table_label,
123 void, (FILE *stream),
124 default_emit_except_table_label)
126 /* Emit a directive for setting the personality for the function. */
128 (emit_except_personality,
129 "If the target implements @code{TARGET_ASM_UNWIND_EMIT}, this hook may be\
130 used to emit a directive to install a personality hook into the unwind\
131 info. This hook should not be used if dwarf2 unwind info is used.",
132 void, (rtx personality),
135 /* Emit any directives required to unwind this instruction. */
139 void, (FILE *stream, rtx insn),
143 (unwind_emit_before_insn,
144 "True if the @code{TARGET_ASM_UNWIND_EMIT} hook should be called before\
145 the assembly for @var{insn} has been emitted, false if the hook should\
146 be called afterward.",
149 /* Generate an internal label.
150 For now this is just a wrapper for ASM_GENERATE_INTERNAL_LABEL. */
152 (generate_internal_label,
154 void, (char *buf, const char *prefix, unsigned long labelno),
155 default_generate_internal_label)
157 /* Output an internal label. */
161 void, (FILE *stream, const char *prefix, unsigned long labelno),
162 default_internal_label)
164 /* Output label for the constant. */
166 (declare_constant_name,
168 void, (FILE *file, const char *name, const_tree expr, HOST_WIDE_INT size),
169 default_asm_declare_constant_name)
171 /* Emit a ttype table reference to a typeinfo object. */
178 /* Emit an assembler directive to set visibility for the symbol
179 associated with the tree decl. */
181 (assemble_visibility,
183 void, (tree decl, int visibility),
184 default_assemble_visibility)
186 /* Output the assembler code for entry to a function. */
190 void, (FILE *file, HOST_WIDE_INT size),
191 default_function_pro_epilogue)
193 /* Output the assembler code for end of prologue. */
195 (function_end_prologue,
200 /* Output the assembler code for start of epilogue. */
202 (function_begin_epilogue,
207 /* Output the assembler code for function exit. */
211 void, (FILE *file, HOST_WIDE_INT size),
212 default_function_pro_epilogue)
214 /* Initialize target-specific sections. */
221 /* Tell assembler to change to section NAME with attributes FLAGS.
222 If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with
223 which this section is associated. */
227 void, (const char *name, unsigned int flags, tree decl),
228 default_no_named_section)
230 /* Return preferred text (sub)section for function DECL.
231 Main purpose of this function is to separate cold, normal and hot
232 functions. STARTUP is true when function is known to be used only
233 at startup (from static constructors or it is main()).
234 EXIT is true when function is known to be used only at exit
235 (from static destructors).
236 Return NULL if function should go to default text section. */
240 section *, (tree decl, enum node_frequency freq, bool startup, bool exit),
241 default_function_section)
243 /* Output the assembler code for function exit. */
245 (function_switched_text_sections,
246 "Used by the target to emit any assembler directives or additional\
247 labels needed when a function is partitioned between different\
248 sections. Output should be written to @var{file}. The function\
249 decl is available as @var{decl} and the new section is `cold' if\
250 @var{new_is_cold} is @code{true}.",
251 void, (FILE *file, tree decl, bool new_is_cold),
252 default_function_switched_text_sections)
254 /* Return a mask describing how relocations should be treated when
255 selecting sections. Bit 1 should be set if global relocations
256 should be placed in a read-write section; bit 0 should be set if
257 local relocations should be placed in a read-write section. */
262 default_reloc_rw_mask)
264 /* Return a section for EXP. It may be a DECL or a constant. RELOC
265 is nonzero if runtime relocations must be applied; bit 1 will be
266 set if the runtime relocations require non-local name resolution.
267 ALIGN is the required alignment of the data. */
271 section *, (tree exp, int reloc, unsigned HOST_WIDE_INT align),
272 default_select_section)
274 /* Return a section for X. MODE is X's mode and ALIGN is its
275 alignment in bits. */
279 section *, (enum machine_mode mode, rtx x, unsigned HOST_WIDE_INT align),
280 default_select_rtx_section)
282 /* Select a unique section name for DECL. RELOC is the same as
283 for SELECT_SECTION. */
287 void, (tree decl, int reloc),
288 default_unique_section)
290 /* Return the readonly data section associated with function DECL. */
292 (function_rodata_section,
294 section *, (tree decl),
295 default_function_rodata_section)
297 /* Nonnull if the target wants to override the default ".rodata" prefix
298 for mergeable data sections. */
300 (mergeable_rodata_prefix,
301 "Usually, the compiler uses the prefix @code{\".rodata\"} to construct\n\
302 section names for mergeable constant data. Define this macro to override\n\
303 the string if a different section name should be used.",
304 const char *, ".rodata")
306 /* Return the section to be used for transactional memory clone tables. */
308 (tm_clone_table_section,
309 "Return the section that should be used for transactional memory clone\
311 section *, (void), default_clone_table_section)
313 /* Output a constructor for a symbol with a given priority. */
317 void, (rtx symbol, int priority), NULL)
319 /* Output a destructor for a symbol with a given priority. */
323 void, (rtx symbol, int priority), NULL)
325 /* Output the assembler code for a thunk function. THUNK_DECL is the
326 declaration for the thunk function itself, FUNCTION is the decl for
327 the target function. DELTA is an immediate constant offset to be
328 added to THIS. If VCALL_OFFSET is nonzero, the word at
329 *(*this + vcall_offset) should be added to THIS. */
333 void, (FILE *file, tree thunk_fndecl, HOST_WIDE_INT delta,
334 HOST_WIDE_INT vcall_offset, tree function),
337 /* Determine whether output_mi_thunk would succeed. */
338 /* ??? Ideally, this hook would not exist, and success or failure
339 would be returned from output_mi_thunk directly. But there's
340 too much undo-able setup involved in invoking output_mi_thunk.
341 Could be fixed by making output_mi_thunk emit rtl instead of
342 text to the output file. */
344 (can_output_mi_thunk,
346 bool, (const_tree thunk_fndecl, HOST_WIDE_INT delta,
347 HOST_WIDE_INT vcall_offset, const_tree function),
348 hook_bool_const_tree_hwi_hwi_const_tree_false)
350 /* Output any boilerplate text needed at the beginning of a
358 /* Output any boilerplate text needed at the end of a translation unit. */
365 /* Output any boilerplate text needed at the beginning of an
366 LTO output stream. */
373 /* Output any boilerplate text needed at the end of an
374 LTO output stream. */
381 /* Output any boilerplace text needed at the end of a
382 translation unit before debug and unwind info is emitted. */
389 /* Output an assembler pseudo-op to declare a library function name
395 default_external_libcall)
397 /* Output an assembler directive to mark decl live. This instructs
398 linker to not dead code strip this symbol. */
400 (mark_decl_preserved,
402 void, (const char *symbol),
403 hook_void_constcharptr)
405 /* Output a record of the command line switches that have been passed. */
407 (record_gcc_switches,
409 int, (print_switch_type type, const char *text),
412 /* The name of the section that the example ELF implementation of
413 record_gcc_switches will use to store the information. Target
414 specific versions of record_gcc_switches may or may not use
417 (record_gcc_switches_section,
419 const char *, ".GCC.command.line")
421 /* Output the definition of a section anchor. */
426 default_asm_output_anchor)
430 "Output a string based on @var{name}, suitable for the @samp{#ident} \
431 directive, or the equivalent directive or pragma in non-C-family languages. \
432 If this hook is not defined, nothing is output for the @samp{#ident} \
434 void, (const char *name),
435 hook_void_constcharptr)
437 /* Output a DTP-relative reference to a TLS symbol. */
439 (output_dwarf_dtprel,
441 void, (FILE *file, int size, rtx x),
444 /* Some target machines need to postscan each insn after it is output. */
446 (final_postscan_insn,
448 void, (FILE *file, rtx insn, rtx *opvec, int noperands),
451 /* Emit the trampoline template. This hook may be NULL. */
453 (trampoline_template,
459 (output_source_filename,
460 "Output COFF information or DWARF debugging information which indicates\
461 that filename @var{name} is the current source file to the stdio\
462 stream @var{file}.\n\
464 This target hook need not be defined if the standard form of output\
465 for the file format in use is appropriate.",
466 void ,(FILE *file, const char *name),
467 default_asm_output_source_filename)
470 (output_addr_const_extra,
472 bool, (FILE *file, rtx x),
473 hook_bool_FILEptr_rtx_false)
475 /* ??? The TARGET_PRINT_OPERAND* hooks are part of the asm_out struct,
476 even though that is not reflected in the macro name to override their
479 #define HOOK_PREFIX "TARGET_"
481 /* Emit a machine-specific insn operand. */
482 /* ??? tm.texi only documents the old macro PRINT_OPERAND,
483 not this hook, and uses a different name for the argument FILE. */
487 void, (FILE *file, rtx x, int code),
488 default_print_operand)
490 /* Emit a machine-specific memory address. */
491 /* ??? tm.texi only documents the old macro PRINT_OPERAND_ADDRESS,
492 not this hook, and uses different argument names. */
494 (print_operand_address,
496 void, (FILE *file, rtx addr),
497 default_print_operand_address)
499 /* Determine whether CODE is a valid punctuation character for the
500 `print_operand' hook. */
501 /* ??? tm.texi only documents the old macro PRINT_OPERAND_PUNCT_VALID_P,
504 (print_operand_punct_valid_p,
506 bool ,(unsigned char code),
507 default_print_operand_punct_valid_p)
509 /* Given a symbol name, perform same mangling as assemble_name and
510 ASM_OUTPUT_LABELREF, returning result as an IDENTIFIER_NODE. */
512 (mangle_assembler_name,
513 "Given a symbol @var{name}, perform same mangling as @code{varasm.c}'s\
514 @code{assemble_name}, but in memory rather than to a file stream, returning\
515 result as an @code{IDENTIFIER_NODE}. Required for correct LTO symtabs. The\
516 default implementation calls the @code{TARGET_STRIP_NAME_ENCODING} hook and\
517 then prepends the @code{USER_LABEL_PREFIX}, if any.",
518 tree, (const char *name),
519 default_mangle_assembler_name)
521 HOOK_VECTOR_END (asm_out)
523 /* Functions relating to instruction scheduling. All of these
524 default to null pointers, which haifa-sched.c looks for and handles. */
526 #define HOOK_PREFIX "TARGET_SCHED_"
527 HOOK_VECTOR (TARGET_SCHED, sched)
529 /* Given the current cost, COST, of an insn, INSN, calculate and
530 return a new cost based on its relationship to DEP_INSN through
531 the dependence LINK. The default is to make no adjustment. */
535 int, (rtx insn, rtx link, rtx dep_insn, int cost), NULL)
537 /* Adjust the priority of an insn as you see fit. Returns the new priority. */
541 int, (rtx insn, int priority), NULL)
543 /* Function which returns the maximum number of insns that can be
544 scheduled in the same machine cycle. This must be constant
545 over an entire compilation. The default is 1. */
551 /* Calculate how much this insn affects how many more insns we
552 can emit this cycle. Default is they all cost the same. */
556 int, (FILE *file, int verbose, rtx insn, int more), NULL)
558 /* Initialize machine-dependent scheduling code. */
562 void, (FILE *file, int verbose, int max_ready), NULL)
564 /* Finalize machine-dependent scheduling code. */
568 void, (FILE *file, int verbose), NULL)
570 /* Initialize machine-dependent function wide scheduling code. */
574 void, (FILE *file, int verbose, int old_max_uid), NULL)
576 /* Finalize machine-dependent function wide scheduling code. */
580 void, (FILE *file, int verbose), NULL)
582 /* Reorder insns in a machine-dependent fashion, in two different
583 places. Default does nothing. */
587 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
592 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
594 /* The following member value is a pointer to a function called
595 after evaluation forward dependencies of insns in chain given
596 by two parameter values (head and tail correspondingly). */
598 (dependencies_evaluation_hook,
600 void, (rtx head, rtx tail), NULL)
602 /* The values of the following four members are pointers to functions
603 used to simplify the automaton descriptions. dfa_pre_cycle_insn and
604 dfa_post_cycle_insn give functions returning insns which are used to
605 change the pipeline hazard recognizer state when the new simulated
606 processor cycle correspondingly starts and finishes. The function
607 defined by init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are
608 used to initialize the corresponding insns. The default values of
609 the members result in not changing the automaton state when the
610 new simulated processor cycle correspondingly starts and finishes. */
613 (init_dfa_pre_cycle_insn,
623 (init_dfa_post_cycle_insn,
628 (dfa_post_cycle_insn,
632 /* The values of the following two members are pointers to
633 functions used to simplify the automaton descriptions.
634 dfa_pre_advance_cycle and dfa_post_advance_cycle are getting called
635 immediately before and after cycle is advanced. */
638 (dfa_pre_advance_cycle,
643 (dfa_post_advance_cycle,
647 /* The following member value is a pointer to a function returning value
648 which defines how many insns in queue `ready' will we try for
649 multi-pass scheduling. If the member value is nonzero and the
650 function returns positive value, the DFA based scheduler will make
651 multi-pass scheduling for the first cycle. In other words, we will
652 try to choose ready insn which permits to start maximum number of
653 insns on the same cycle. */
655 (first_cycle_multipass_dfa_lookahead,
659 /* The following member value is pointer to a function controlling
660 what insns from the ready insn queue will be considered for the
661 multipass insn scheduling. If the hook returns zero for insn
662 passed as the parameter, the insn will be not chosen to be issued. */
664 (first_cycle_multipass_dfa_lookahead_guard,
666 int, (rtx insn), NULL)
668 /* This hook prepares the target for a new round of multipass
670 DATA is a pointer to target-specific data used for multipass scheduling.
671 READY_TRY and N_READY represent the current state of search in the
672 optimization space. The target can filter out instructions that
673 should not be tried during current round by setting corresponding
674 elements in READY_TRY to non-zero.
675 FIRST_CYCLE_INSN_P is true if this is the first round of multipass
676 scheduling on current cycle. */
678 (first_cycle_multipass_begin,
680 void, (void *data, char *ready_try, int n_ready, bool first_cycle_insn_p),
683 /* This hook is called when multipass scheduling evaluates instruction INSN.
684 DATA is a pointer to target-specific data that can be used to record effects
685 of INSN on CPU that are not described in DFA.
686 READY_TRY and N_READY represent the current state of search in the
687 optimization space. The target can filter out instructions that
688 should not be tried after issuing INSN by setting corresponding
689 elements in READY_TRY to non-zero.
690 INSN is the instruction being evaluated.
691 PREV_DATA is a pointer to target-specific data corresponding
692 to a state before issuing INSN. */
694 (first_cycle_multipass_issue,
696 void, (void *data, char *ready_try, int n_ready, rtx insn,
697 const void *prev_data), NULL)
699 /* This hook is called when multipass scheduling backtracks from evaluation of
700 instruction corresponding to DATA.
701 DATA is a pointer to target-specific data that stores the effects
702 of instruction from which the algorithm backtracks on CPU that are not
704 READY_TRY and N_READY represent the current state of search in the
705 optimization space. The target can filter out instructions that
706 should not be tried after issuing INSN by setting corresponding
707 elements in READY_TRY to non-zero. */
709 (first_cycle_multipass_backtrack,
711 void, (const void *data, char *ready_try, int n_ready), NULL)
713 /* This hook notifies the target about the result of the concluded current
714 round of multipass scheduling.
716 If DATA is non-NULL it points to target-specific data used for multipass
717 scheduling which corresponds to instruction at the start of the chain of
718 the winning solution. DATA is NULL when multipass scheduling cannot find
719 a good enough solution on current cycle and decides to retry later,
720 usually after advancing the cycle count. */
722 (first_cycle_multipass_end,
724 void, (const void *data), NULL)
726 /* This hook is called to initialize target-specific data for multipass
727 scheduling after it has been allocated.
728 DATA is a pointer to target-specific data that stores the effects
729 of instruction from which the algorithm backtracks on CPU that are not
732 (first_cycle_multipass_init,
734 void, (void *data), NULL)
736 /* This hook is called to finalize target-specific data for multipass
737 scheduling before it is deallocated.
738 DATA is a pointer to target-specific data that stores the effects
739 of instruction from which the algorithm backtracks on CPU that are not
742 (first_cycle_multipass_fini,
744 void, (void *data), NULL)
746 /* The following member value is pointer to a function called by
747 the insn scheduler before issuing insn passed as the third
748 parameter on given cycle. If the hook returns nonzero, the
749 insn is not issued on given processors cycle. Instead of that,
750 the processor cycle is advanced. If the value passed through
751 the last parameter is zero, the insn ready queue is not sorted
752 on the new cycle start as usually. The first parameter passes
753 file for debugging output. The second one passes the scheduler
754 verbose level of the debugging output. The forth and the fifth
755 parameter values are correspondingly processor cycle on which
756 the previous insn has been issued and the current processor cycle. */
760 int, (FILE *dump, int verbose, rtx insn, int last_clock,
761 int clock, int *sort_p),
764 /* The following member value is a pointer to a function called by the
765 insn scheduler. It should return true if there exists a dependence
766 which is considered costly by the target, between the insn
767 DEP_PRO (&_DEP), and the insn DEP_CON (&_DEP). The first parameter is
768 the dep that represents the dependence between the two insns. The
769 second argument is the cost of the dependence as estimated by
770 the scheduler. The last argument is the distance in cycles
771 between the already scheduled insn (first parameter) and the
772 second insn (second parameter). */
774 (is_costly_dependence,
776 bool, (struct _dep *_dep, int cost, int distance), NULL)
780 "Given the current cost, @var{cost}, of an insn, @var{insn}, calculate and\
781 return a new cost based on its relationship to @var{dep_insn} through the\
782 dependence of weakness @var{dw}. The default is to make no adjustment.",
783 int, (rtx insn, int dep_type1, rtx dep_insn, int cost, int dw), NULL)
785 /* The following member value is a pointer to a function called
786 by the insn scheduler. This hook is called to notify the backend
787 that new instructions were emitted. */
793 /* Next 5 functions are for multi-point scheduling. */
795 /* Allocate memory for scheduler context. */
797 (alloc_sched_context,
799 void *, (void), NULL)
801 /* Fills the context from the local machine scheduler context. */
805 void, (void *tc, bool clean_p), NULL)
807 /* Sets local machine scheduler context to a saved value. */
811 void, (void *tc), NULL)
813 /* Clears a scheduler context so it becomes like after init. */
815 (clear_sched_context,
817 void, (void *tc), NULL)
819 /* Frees the scheduler context. */
823 void, (void *tc), NULL)
825 /* The following member value is a pointer to a function called
826 by the insn scheduler.
827 The first parameter is an instruction, the second parameter is the type
828 of the requested speculation, and the third parameter is a pointer to the
829 speculative pattern of the corresponding type (set if return value == 1).
831 -1, if there is no pattern, that will satisfy the requested speculation type,
832 0, if current pattern satisfies the requested speculation type,
833 1, if pattern of the instruction should be changed to the newly
838 int, (rtx insn, int request, rtx *new_pat), NULL)
840 /* The following member value is a pointer to a function called
841 by the insn scheduler. It should return true if the check instruction
842 passed as the parameter needs a recovery block. */
846 bool, (int dep_status), NULL)
848 /* The following member value is a pointer to a function called
849 by the insn scheduler. It should return a pattern for the check
851 The first parameter is a speculative instruction, the second parameter
852 is the label of the corresponding recovery block (or null, if it is a
853 simple check). If the mutation of the check is requested (e.g. from
854 ld.c to chk.a), the third parameter is true - in this case the first
855 parameter is the previous check. */
859 rtx, (rtx insn, rtx label, int mutate_p), NULL)
861 /* The following member value is a pointer to a function controlling
862 what insns from the ready insn queue will be considered for the
863 multipass insn scheduling. If the hook returns zero for the insn
864 passed as the parameter, the insn will not be chosen to be
865 issued. This hook is used to discard speculative instructions,
866 that stand at the first position of the ready list. */
868 (first_cycle_multipass_dfa_lookahead_guard_spec,
870 bool, (const_rtx insn), NULL)
872 /* The following member value is a pointer to a function that provides
873 information about the speculation capabilities of the target.
874 The parameter is a pointer to spec_info variable. */
878 void, (struct spec_info_def *spec_info), NULL)
882 "Return speculation types of instruction @var{insn}.",
883 int, (rtx insn), NULL)
886 (get_insn_checked_ds,
887 "Return speculation types that are checked for instruction @var{insn}",
888 int, (rtx insn), NULL)
892 "Return bool if rtx scanning should just skip current layer and\
893 advance to the inner rtxes.",
894 bool, (const_rtx x), NULL)
896 /* The following member value is a pointer to a function that provides
897 information about the target resource-based lower bound which is
898 used by the swing modulo scheduler. The parameter is a pointer
903 int, (struct ddg *g), NULL)
905 /* The following member value is a function that initializes dispatch
906 schedling and adds instructions to dispatch window according to its
911 void, (rtx insn, int x),
914 /* The following member value is a a function that returns true is
915 dispatch schedling is supported in hardware and condition passed
916 as the second parameter is true. */
920 bool, (rtx insn, int x),
921 hook_bool_rtx_int_false)
925 "True if the processor has an exposed pipeline, which means that not just\n\
926 the order of instructions is important for correctness when scheduling, but\n\
927 also the latencies of operations.",
930 /* The following member value is a function that returns number
931 of operations reassociator should try to put in parallel for
932 statements of the given type. By default 1 is used. */
934 (reassociation_width,
935 "This hook is called by tree reassociator to determine a level of\n\
936 parallelism required in output calculations chain.",
937 int, (unsigned int opc, enum machine_mode mode),
938 hook_int_uint_mode_1)
940 HOOK_VECTOR_END (sched)
942 /* Functions relating to vectorization. */
944 #define HOOK_PREFIX "TARGET_VECTORIZE_"
945 HOOK_VECTOR (TARGET_VECTORIZE, vectorize)
947 /* The following member value is a pointer to a function called
948 by the vectorizer, and return the decl of the target builtin
951 (builtin_mask_for_load,
955 /* Returns a code for builtin that realizes vectorized version of
956 function, or NULL_TREE if not available. */
958 (builtin_vectorized_function,
960 tree, (tree fndecl, tree vec_type_out, tree vec_type_in),
961 default_builtin_vectorized_function)
963 /* Returns a function declaration for a builtin that realizes the
964 vector conversion, or NULL_TREE if not available. */
968 tree, (unsigned code, tree dest_type, tree src_type),
969 default_builtin_vectorized_conversion)
971 /* Cost of different vector/scalar statements in vectorization cost
972 model. In case of misaligned vector loads and stores the cost depends
973 on the data type and misalignment value. */
975 (builtin_vectorization_cost,
977 int, (enum vect_cost_for_stmt type_of_cost, tree vectype, int misalign),
978 default_builtin_vectorization_cost)
980 /* Return true if vector alignment is reachable (by peeling N
981 iterations) for the given type. */
983 (vector_alignment_reachable,
985 bool, (const_tree type, bool is_packed),
986 default_builtin_vector_alignment_reachable)
988 /* Return true if a vector created for vec_perm_const is valid.
989 A NULL indicates that all constants are valid permutations. */
993 bool, (enum machine_mode, const unsigned char *sel),
996 /* Return true if the target supports misaligned store/load of a
997 specific factor denoted in the third parameter. The last parameter
998 is true if the access is defined in a packed struct. */
1000 (support_vector_misalignment,
1003 (enum machine_mode mode, const_tree type, int misalignment, bool is_packed),
1004 default_builtin_support_vector_misalignment)
1006 /* Return the builtin decl needed to load a vector of TYPE. */
1009 "This hook should return the built-in decl needed to load a vector of the "
1010 "given type within a transaction.",
1013 default_builtin_tm_load_store)
1015 /* Return the builtin decl needed to store a vector of TYPE. */
1018 "This hook should return the built-in decl needed to store a vector of the "
1019 "given type within a transaction.",
1022 default_builtin_tm_load_store)
1024 /* Returns the preferred mode for SIMD operations for the specified
1027 (preferred_simd_mode,
1030 (enum machine_mode mode),
1031 default_preferred_simd_mode)
1033 /* Returns a mask of vector sizes to iterate over when auto-vectorizing
1034 after processing the preferred one derived from preferred_simd_mode. */
1036 (autovectorize_vector_sizes,
1040 default_autovectorize_vector_sizes)
1042 /* Target builtin that implements vector gather operation. */
1047 (const_tree mem_vectype, const_tree index_type, int scale),
1050 /* Target function to initialize the cost model for a loop or block. */
1053 "This hook should initialize target-specific data structures in preparation "
1054 "for modeling the costs of vectorizing a loop or basic block. The default "
1055 "allocates three unsigned integers for accumulating costs for the prologue, "
1056 "body, and epilogue of the loop or basic block. If @var{loop_info} is "
1057 "non-NULL, it identifies the loop being vectorized; otherwise a single block "
1058 "is being vectorized.",
1060 (struct loop *loop_info),
1063 /* Target function to record N statements of the given kind using the
1064 given vector type within the cost model data for the current loop or
1068 "This hook should update the target-specific @var{data} in response to "
1069 "adding @var{count} copies of the given @var{kind} of statement to a "
1070 "loop or basic block. The default adds the builtin vectorizer cost for "
1071 "the copies of the statement to the accumulator specified by @var{where}, "
1072 "(the prologue, body, or epilogue) and returns the amount added. The "
1073 "return value should be viewed as a tentative cost that may later be "
1076 (void *data, int count, enum vect_cost_for_stmt kind,
1077 struct _stmt_vec_info *stmt_info, int misalign,
1078 enum vect_cost_model_location where),
1079 default_add_stmt_cost)
1081 /* Target function to calculate the total cost of the current vectorized
1085 "This hook should complete calculations of the cost of vectorizing a loop "
1086 "or basic block based on @var{data}, and return the prologue, body, and "
1087 "epilogue costs as unsigned integers. The default returns the value of "
1088 "the three accumulators.",
1090 (void *data, unsigned *prologue_cost, unsigned *body_cost,
1091 unsigned *epilogue_cost),
1092 default_finish_cost)
1094 /* Function to delete target-specific cost modeling data. */
1097 "This hook should release @var{data} and any related data structures "
1098 "allocated by TARGET_VECTORIZE_INIT_COST. The default releases the "
1102 default_destroy_cost_data)
1104 HOOK_VECTOR_END (vectorize)
1107 #define HOOK_PREFIX "TARGET_"
1109 /* Allow target specific overriding of option settings after options have
1110 been changed by an attribute or pragma or when it is reset at the
1111 end of the code affected by an attribute or pragma. */
1113 (override_options_after_change,
1119 (eh_return_filter_mode,
1120 "Return machine mode for filter value.",
1121 enum machine_mode, (void),
1122 default_eh_return_filter_mode)
1124 /* Return machine mode for libgcc expanded cmp instructions. */
1126 (libgcc_cmp_return_mode,
1128 enum machine_mode, (void),
1129 default_libgcc_cmp_return_mode)
1131 /* Return machine mode for libgcc expanded shift instructions. */
1133 (libgcc_shift_count_mode,
1135 enum machine_mode, (void),
1136 default_libgcc_shift_count_mode)
1138 /* Return machine mode to be used for _Unwind_Word type. */
1142 enum machine_mode, (void),
1143 default_unwind_word_mode)
1145 /* Given two decls, merge their attributes and return the result. */
1147 (merge_decl_attributes,
1149 tree, (tree olddecl, tree newdecl),
1150 merge_decl_attributes)
1152 /* Given two types, merge their attributes and return the result. */
1154 (merge_type_attributes,
1156 tree, (tree type1, tree type2),
1157 merge_type_attributes)
1159 /* Table of machine attributes and functions to handle them.
1164 const struct attribute_spec *, NULL)
1166 /* Return true iff attribute NAME expects a plain identifier as its first
1169 (attribute_takes_identifier_p,
1171 bool, (const_tree name),
1172 hook_bool_const_tree_false)
1174 /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
1175 one if they are compatible and two if they are nearly compatible
1176 (which causes a warning to be generated). */
1178 (comp_type_attributes,
1180 int, (const_tree type1, const_tree type2),
1181 hook_int_const_tree_const_tree_1)
1183 /* Assign default attributes to the newly defined TYPE. */
1185 (set_default_type_attributes,
1190 /* Insert attributes on the newly created DECL. */
1194 void, (tree node, tree *attr_ptr),
1195 hook_void_tree_treeptr)
1197 /* Return true if FNDECL (which has at least one machine attribute)
1198 can be inlined despite its machine attributes, false otherwise. */
1200 (function_attribute_inlinable_p,
1202 bool, (const_tree fndecl),
1203 hook_bool_const_tree_false)
1205 /* Return true if bitfields in RECORD_TYPE should follow the
1206 Microsoft Visual C++ bitfield layout rules. */
1208 (ms_bitfield_layout_p,
1210 bool, (const_tree record_type),
1211 hook_bool_const_tree_false)
1213 /* For now this is only an interface to WORDS_BIG_ENDIAN for
1214 target-independent code like the front ends, need performance testing
1215 before switching completely to the target hook. */
1220 targhook_words_big_endian)
1222 /* Likewise for FLOAT_WORDS_BIG_ENDIAN. */
1224 (float_words_big_endian,
1227 targhook_float_words_big_endian)
1229 /* True if the target supports decimal floating point. */
1231 (decimal_float_supported_p,
1234 default_decimal_float_supported_p)
1236 /* True if the target supports fixed-point. */
1238 (fixed_point_supported_p,
1241 default_fixed_point_supported_p)
1243 /* Return true if anonymous bitfields affect structure alignment. */
1245 (align_anon_bitfield,
1248 hook_bool_void_false)
1250 /* Return true if volatile bitfields should use the narrowest type possible.
1251 Return false if they should use the container type. */
1253 (narrow_volatile_bitfield,
1256 hook_bool_void_false)
1258 /* Set up target-specific built-in functions. */
1265 /* Initialize (if INITIALIZE_P is true) and return the target-specific
1266 built-in function decl for CODE.
1267 Return NULL if that is not possible. Return error_mark_node if CODE
1268 is outside of the range of valid target builtin function codes. */
1272 tree, (unsigned code, bool initialize_p), NULL)
1274 /* Expand a target-specific builtin. */
1279 (tree exp, rtx target, rtx subtarget, enum machine_mode mode, int ignore),
1280 default_expand_builtin)
1282 /* Select a replacement for a target-specific builtin. This is done
1283 *before* regular type checking, and so allows the target to
1284 implement a crude form of function overloading. The result is a
1285 complete expression that implements the operation. PARAMS really
1286 has type VEC(tree,gc)*, but we don't want to include tree.h here. */
1288 (resolve_overloaded_builtin,
1290 tree, (unsigned int /*location_t*/ loc, tree fndecl, void *arglist), NULL)
1292 /* Fold a target-specific builtin. */
1296 tree, (tree fndecl, int n_args, tree *argp, bool ignore),
1297 hook_tree_tree_int_treep_bool_null)
1299 /* Target hook is used to compare the target attributes in two functions to
1300 determine which function's features get higher priority. This is used
1301 during function multi-versioning to figure out the order in which two
1302 versions must be dispatched. A function version with a higher priority
1303 is checked for dispatching earlier. DECL1 and DECL2 are
1304 the two function decls that will be compared. It returns positive value
1305 if DECL1 is higher priority, negative value if DECL2 is higher priority
1306 and 0 if they are the same. */
1308 (compare_version_priority,
1310 int, (tree decl1, tree decl2), NULL)
1312 /* Target hook is used to generate the dispatcher logic to invoke the right
1313 function version at run-time for a given set of function versions.
1314 ARG points to the callgraph node of the dispatcher function whose body
1315 must be generated. */
1317 (generate_version_dispatcher_body,
1319 tree, (void *arg), NULL)
1321 /* Target hook is used to get the dispatcher function for a set of function
1322 versions. The dispatcher function is called to invoke the right function
1323 version at run-time. DECL is one version from a set of semantically
1324 identical versions. */
1326 (get_function_versions_dispatcher,
1328 tree, (void *decl), NULL)
1330 /* Returns a code for a target-specific builtin that implements
1331 reciprocal of the function, or NULL_TREE if not available. */
1333 (builtin_reciprocal,
1335 tree, (unsigned fn, bool md_fn, bool sqrt),
1336 default_builtin_reciprocal)
1338 /* For a vendor-specific TYPE, return a pointer to a statically-allocated
1339 string containing the C++ mangling for TYPE. In all other cases, return
1344 const char *, (const_tree type),
1345 hook_constcharptr_const_tree_null)
1347 /* Make any adjustments to libfunc names needed for this target. */
1354 /* Add a __gnu_ prefix to library functions rather than just __. */
1356 (libfunc_gnu_prefix,
1357 "If false (the default), internal library routines start with two\n\
1358 underscores. If set to true, these routines start with @code{__gnu_}\n\
1359 instead. E.g., @code{__muldi3} changes to @code{__gnu_muldi3}. This\n\
1360 currently only affects functions defined in @file{libgcc2.c}. If this\n\
1361 is set to true, the @file{tm.h} file must also\n\
1362 @code{#define LIBGCC2_GNU_PREFIX}.",
1365 /* Given a decl, a section name, and whether the decl initializer
1366 has relocs, choose attributes for the section. */
1367 /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */
1369 (section_type_flags,
1371 unsigned int, (tree decl, const char *name, int reloc),
1372 default_section_type_flags)
1374 /* True if new jumps cannot be created, to replace existing ones or
1375 not, at the current point in the compilation. */
1377 (cannot_modify_jumps_p,
1380 hook_bool_void_false)
1382 /* True if FOLLOWER may be modified to follow FOLLOWEE. */
1385 "FOLLOWER and FOLLOWEE are JUMP_INSN instructions;\
1386 return true if FOLLOWER may be modified to follow FOLLOWEE;\
1387 false, if it can't.\
1388 For example, on some targets, certain kinds of branches can't be made to\
1389 follow through a hot/cold partitioning.",
1390 bool, (const_rtx follower, const_rtx followee),
1391 hook_bool_const_rtx_const_rtx_true)
1393 /* Return a register class for which branch target register
1394 optimizations should be applied. */
1396 (branch_target_register_class,
1398 reg_class_t, (void),
1399 default_branch_target_register_class)
1401 /* Return true if branch target register optimizations should include
1402 callee-saved registers that are not already live during the current
1403 function. AFTER_PE_GEN is true if prologues and epilogues have
1404 already been generated. */
1406 (branch_target_register_callee_saved,
1408 bool, (bool after_prologue_epilogue_gen),
1409 hook_bool_bool_false)
1411 /* Return true if the target supports conditional execution. */
1413 (have_conditional_execution,
1416 default_have_conditional_execution)
1418 /* Return a new value for loop unroll size. */
1420 (loop_unroll_adjust,
1422 unsigned, (unsigned nunroll, struct loop *loop),
1425 /* True if X is a legitimate MODE-mode immediate operand. */
1427 (legitimate_constant_p,
1429 bool, (enum machine_mode mode, rtx x),
1430 hook_bool_mode_rtx_true)
1432 /* True if the constant X cannot be placed in the constant pool. */
1434 (cannot_force_const_mem,
1436 bool, (enum machine_mode mode, rtx x),
1437 hook_bool_mode_rtx_false)
1440 (cannot_copy_insn_p,
1441 "True if the insn @var{x} cannot be duplicated.",
1444 /* True if X is considered to be commutative. */
1448 bool, (const_rtx x, int outer_code),
1449 hook_bool_const_rtx_commutative_p)
1451 /* True if ADDR is an address-expression whose effect depends
1452 on the mode of the memory reference it is used in. */
1454 (mode_dependent_address_p,
1456 bool, (const_rtx addr, addr_space_t addrspace),
1457 default_mode_dependent_address_p)
1459 /* Given an invalid address X for a given machine mode, try machine-specific
1460 ways to make it legitimate. Return X or an invalid address on failure. */
1462 (legitimize_address,
1464 rtx, (rtx x, rtx oldx, enum machine_mode mode),
1465 default_legitimize_address)
1467 /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */
1469 (delegitimize_address,
1472 delegitimize_mem_from_attrs)
1474 /* Given an RTX, return true if it is not ok to emit it into debug info
1477 (const_not_ok_for_debug_p,
1480 hook_bool_rtx_false)
1482 /* Given an address RTX, say whether it is valid. */
1484 (legitimate_address_p,
1486 bool, (enum machine_mode mode, rtx x, bool strict),
1487 default_legitimate_address_p)
1489 /* True if the given constant can be put into an object_block. */
1491 (use_blocks_for_constant_p,
1493 bool, (enum machine_mode mode, const_rtx x),
1494 hook_bool_mode_const_rtx_false)
1496 /* True if the given decl can be put into an object_block. */
1498 (use_blocks_for_decl_p,
1500 bool, (const_tree decl),
1501 hook_bool_const_tree_true)
1503 /* The minimum and maximum byte offsets for anchored addresses. */
1514 /* True if section anchors can be used to access the given symbol. */
1516 (use_anchors_for_symbol_p,
1518 bool, (const_rtx x),
1519 default_use_anchors_for_symbol_p)
1521 /* True if it is OK to do sibling call optimization for the specified
1522 call expression EXP. DECL will be the called function, or NULL if
1523 this is an indirect call. */
1525 (function_ok_for_sibcall,
1527 bool, (tree decl, tree exp),
1528 hook_bool_tree_tree_false)
1530 /* Establish appropriate back-end context for processing the function
1531 FNDECL. The argument might be NULL to indicate processing at top
1532 level, outside of any function scope. */
1534 (set_current_function,
1536 void, (tree decl), hook_void_tree)
1538 /* True if EXP should be placed in a "small data" section. */
1542 bool, (const_tree exp),
1543 hook_bool_const_tree_false)
1545 /* True if EXP names an object for which name resolution must resolve
1546 to the current executable or shared library. */
1550 bool, (const_tree exp),
1551 default_binds_local_p)
1553 /* Check if profiling code is before or after prologue. */
1555 (profile_before_prologue,
1556 "It returns true if target wants profile code emitted before prologue.\n\n\
1557 The default version of this hook use the target macro\n\
1558 @code{PROFILE_BEFORE_PROLOGUE}.",
1560 default_profile_before_prologue)
1562 /* Modify and return the identifier of a DECL's external name,
1563 originally identified by ID, as required by the target,
1564 (eg, append @nn to windows32 stdcall function names).
1565 The default is to return ID without modification. */
1567 (mangle_decl_assembler_name,
1569 tree, (tree decl, tree id),
1570 default_mangle_decl_assembler_name)
1572 /* Do something target-specific to record properties of the DECL into
1573 the associated SYMBOL_REF. */
1575 (encode_section_info,
1577 void, (tree decl, rtx rtl, int new_decl_p),
1578 default_encode_section_info)
1580 /* Undo the effects of encode_section_info on the symbol string. */
1582 (strip_name_encoding,
1584 const char *, (const char *name),
1585 default_strip_name_encoding)
1587 /* If shift optabs for MODE are known to always truncate the shift count,
1588 return the mask that they apply. Return 0 otherwise. */
1590 (shift_truncation_mask,
1592 unsigned HOST_WIDE_INT, (enum machine_mode mode),
1593 default_shift_truncation_mask)
1595 /* Return the number of divisions in the given MODE that should be present,
1596 so that it is profitable to turn the division into a multiplication by
1599 (min_divisions_for_recip_mul,
1601 unsigned int, (enum machine_mode mode),
1602 default_min_divisions_for_recip_mul)
1604 /* If the representation of integral MODE is such that values are
1605 always sign-extended to a wider mode MODE_REP then return
1606 SIGN_EXTEND. Return UNKNOWN otherwise. */
1607 /* Note that the return type ought to be RTX_CODE, but that's not
1608 necessarily defined at this point. */
1612 int, (enum machine_mode mode, enum machine_mode rep_mode),
1613 default_mode_rep_extended)
1615 /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */
1617 (valid_pointer_mode,
1619 bool, (enum machine_mode mode),
1620 default_valid_pointer_mode)
1622 /* Disambiguate with errno. */
1624 (ref_may_alias_errno,
1625 "Define this to return nonzero if the memory reference @var{ref}\
1626 may alias with the system C library errno location. The default\
1627 version of this hook assumes the system C library errno location\
1628 is either a declaration of type int or accessed by dereferencing\
1630 bool, (struct ao_ref_s *ref),
1631 default_ref_may_alias_errno)
1633 /* Support for named address spaces. */
1635 #define HOOK_PREFIX "TARGET_ADDR_SPACE_"
1636 HOOK_VECTOR (TARGET_ADDR_SPACE_HOOKS, addr_space)
1638 /* MODE to use for a pointer into another address space. */
1642 enum machine_mode, (addr_space_t address_space),
1643 default_addr_space_pointer_mode)
1645 /* MODE to use for an address in another address space. */
1649 enum machine_mode, (addr_space_t address_space),
1650 default_addr_space_address_mode)
1652 /* True if MODE is valid for a pointer in __attribute__((mode("MODE")))
1653 in another address space. */
1655 (valid_pointer_mode,
1657 bool, (enum machine_mode mode, addr_space_t as),
1658 default_addr_space_valid_pointer_mode)
1660 /* True if an address is a valid memory address to a given named address
1661 space for a given mode. */
1663 (legitimate_address_p,
1665 bool, (enum machine_mode mode, rtx exp, bool strict, addr_space_t as),
1666 default_addr_space_legitimate_address_p)
1668 /* Return an updated address to convert an invalid pointer to a named
1669 address space to a valid one. If NULL_RTX is returned use machine
1670 independent methods to make the address valid. */
1672 (legitimize_address,
1674 rtx, (rtx x, rtx oldx, enum machine_mode mode, addr_space_t as),
1675 default_addr_space_legitimize_address)
1677 /* True if one named address space is a subset of another named address. */
1681 bool, (addr_space_t subset, addr_space_t superset),
1682 default_addr_space_subset_p)
1684 /* Function to convert an rtl expression from one address space to another. */
1688 rtx, (rtx op, tree from_type, tree to_type),
1689 default_addr_space_convert)
1691 HOOK_VECTOR_END (addr_space)
1694 #define HOOK_PREFIX "TARGET_"
1696 /* True if MODE is valid for the target. By "valid", we mean able to
1697 be manipulated in non-trivial ways. In particular, this means all
1698 the arithmetic is supported. */
1700 (scalar_mode_supported_p,
1702 bool, (enum machine_mode mode),
1703 default_scalar_mode_supported_p)
1705 /* Similarly for vector modes. "Supported" here is less strict. At
1706 least some operations are supported; need to check optabs or builtins
1707 for further details. */
1709 (vector_mode_supported_p,
1711 bool, (enum machine_mode mode),
1712 hook_bool_mode_false)
1716 "This hook can be used to define the alignment for a vector of type\n\
1717 @var{type}, in order to comply with a platform ABI. The default is to\n\
1718 require natural alignment for vector types. The alignment returned by\n\
1719 this hook must be a power-of-two multiple of the default alignment of\n\
1720 the vector element type.",
1721 HOST_WIDE_INT, (const_tree type),
1722 default_vector_alignment)
1724 /* True if we should try to use a scalar mode to represent an array,
1725 overriding the usual MAX_FIXED_MODE limit. */
1727 (array_mode_supported_p,
1728 "Return true if GCC should try to use a scalar mode to store an array\n\
1729 of @var{nelems} elements, given that each element has mode @var{mode}.\n\
1730 Returning true here overrides the usual @code{MAX_FIXED_MODE} limit\n\
1731 and allows GCC to use any defined integer mode.\n\
1733 One use of this hook is to support vector load and store operations\n\
1734 that operate on several homogeneous vectors. For example, ARM NEON\n\
1735 has operations like:\n\
1738 int8x8x3_t vld3_s8 (const int8_t *)\n\
1739 @end smallexample\n\
1741 where the return type is defined as:\n\
1744 typedef struct int8x8x3_t\n\
1748 @end smallexample\n\
1750 If this hook allows @code{val} to have a scalar mode, then\n\
1751 @code{int8x8x3_t} can have the same mode. GCC can then store\n\
1752 @code{int8x8x3_t}s in registers rather than forcing them onto the stack.",
1753 bool, (enum machine_mode mode, unsigned HOST_WIDE_INT nelems),
1754 hook_bool_mode_uhwi_false)
1756 /* Compute cost of moving data from a register of class FROM to one of
1759 (register_move_cost,
1761 int, (enum machine_mode mode, reg_class_t from, reg_class_t to),
1762 default_register_move_cost)
1764 /* Compute cost of moving registers to/from memory. */
1765 /* ??? Documenting the argument types for this hook requires a GFDL
1766 license grant. Also, the documentation uses a different name for RCLASS. */
1770 int, (enum machine_mode mode, reg_class_t rclass, bool in),
1771 default_memory_move_cost)
1773 /* True for MODE if the target expects that registers in this mode will
1774 be allocated to registers in a small register class. The compiler is
1775 allowed to use registers explicitly used in the rtl as spill registers
1776 but it should prevent extending the lifetime of these registers. */
1778 (small_register_classes_for_mode_p,
1780 bool, (enum machine_mode mode),
1781 hook_bool_mode_false)
1783 /* Register number for a flags register. Only needs to be defined if the
1784 target is constrainted to use post-reload comparison elimination. */
1787 "If the target has a dedicated flags register, and it needs to use the\
1788 post-reload comparison elimination pass, then this value should be set\
1790 unsigned int, INVALID_REGNUM)
1792 /* Compute a (partial) cost for rtx X. Return true if the complete
1793 cost has been computed, and false if subexpressions should be
1794 scanned. In either case, *TOTAL contains the cost result. */
1795 /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's
1796 not necessarily defined at this point. */
1800 bool, (rtx x, int code, int outer_code, int opno, int *total, bool speed),
1801 hook_bool_rtx_int_int_int_intp_bool_false)
1803 /* Compute the cost of X, used as an address. Never called with
1804 invalid addresses. */
1808 int, (rtx address, enum machine_mode mode, addr_space_t as, bool speed),
1809 default_address_cost)
1811 /* Return where to allocate pseudo for a given hard register initial value. */
1813 (allocate_initial_value,
1815 rtx, (rtx hard_reg), NULL)
1817 /* Return nonzero if evaluating UNSPEC X might cause a trap.
1818 FLAGS has the same meaning as in rtlanal.c: may_trap_p_1. */
1822 int, (const_rtx x, unsigned flags),
1823 default_unspec_may_trap_p)
1825 /* Given a register, this hook should return a parallel of registers
1826 to represent where to find the register pieces. Define this hook
1827 if the register and its mode are represented in Dwarf in
1828 non-contiguous locations, or if the register should be
1829 represented in more than one register in Dwarf. Otherwise, this
1830 hook should return NULL_RTX. */
1832 (dwarf_register_span,
1837 /* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
1838 entries not corresponding directly to registers below
1839 FIRST_PSEUDO_REGISTER, this hook should generate the necessary
1840 code, given the address of the table. */
1842 (init_dwarf_reg_sizes_extra,
1844 void, (tree address),
1847 /* Fetch the fixed register(s) which hold condition codes, for
1848 targets where it makes sense to look for duplicate assignments to
1849 the condition codes. This should return true if there is such a
1850 register, false otherwise. The arguments should be set to the
1851 fixed register numbers. Up to two condition code registers are
1852 supported. If there is only one for this target, the int pointed
1853 at by the second argument should be set to -1. */
1855 (fixed_condition_code_regs,
1857 bool, (unsigned int *p1, unsigned int *p2),
1858 hook_bool_uintp_uintp_false)
1860 /* If two condition code modes are compatible, return a condition
1861 code mode which is compatible with both, such that a comparison
1862 done in the returned mode will work for both of the original
1863 modes. If the condition code modes are not compatible, return
1866 (cc_modes_compatible,
1868 enum machine_mode, (enum machine_mode m1, enum machine_mode m2),
1869 default_cc_modes_compatible)
1871 /* Do machine-dependent code transformations. Called just before
1872 delayed-branch scheduling. */
1874 (machine_dependent_reorg,
1878 /* Create the __builtin_va_list type. */
1880 (build_builtin_va_list,
1883 std_build_builtin_va_list)
1885 /* Enumerate the va list variants. */
1889 int, (int idx, const char **pname, tree *ptree),
1892 /* Get the cfun/fndecl calling abi __builtin_va_list type. */
1896 tree, (tree fndecl),
1899 /* Get the __builtin_va_list type dependent on input type. */
1901 (canonical_va_list_type,
1904 std_canonical_va_list_type)
1906 /* ??? Documenting this hook requires a GFDL license grant. */
1908 (expand_builtin_va_start,
1909 "Expand the @code{__builtin_va_start} builtin.",
1910 void, (tree valist, rtx nextarg), NULL)
1912 /* Gimplifies a VA_ARG_EXPR. */
1914 (gimplify_va_arg_expr,
1916 tree, (tree valist, tree type, gimple_seq *pre_p, gimple_seq *post_p),
1917 std_gimplify_va_arg_expr)
1919 /* Validity-checking routines for PCH files, target-specific.
1920 get_pch_validity returns a pointer to the data to be stored,
1921 and stores the size in its argument. pch_valid_p gets the same
1922 information back and returns NULL if the PCH is valid,
1923 or an error message if not. */
1927 void *, (size_t *sz),
1928 default_get_pch_validity)
1933 const char *, (const void *data, size_t sz),
1934 default_pch_valid_p)
1938 "Called before writing out a PCH file. If the target has some\n\
1939 garbage-collected data that needs to be in a particular state on PCH loads,\n\
1940 it can use this hook to enforce that state. Very few targets need\n\
1941 to do anything here.",
1945 /* If nonnull, this function checks whether a PCH file with the
1946 given set of target flags can be used. It returns NULL if so,
1947 otherwise it returns an error message. */
1949 (check_pch_target_flags,
1951 const char *, (int pch_flags), NULL)
1953 /* True if the compiler should give an enum type only as many
1954 bytes as it takes to represent the range of possible values of
1957 (default_short_enums,
1960 hook_bool_void_false)
1962 /* This target hook returns an rtx that is used to store the address
1963 of the current frame into the built-in setjmp buffer. */
1965 (builtin_setjmp_frame_value,
1968 default_builtin_setjmp_frame_value)
1970 /* This target hook should add STRING_CST trees for any hard regs
1971 the port wishes to automatically clobber for an asm. */
1975 tree, (tree outputs, tree inputs, tree clobbers),
1976 hook_tree_tree_tree_tree_3rd_identity)
1978 /* This target hook allows the backend to specify a calling convention
1979 in the debug information. This function actually returns an
1980 enum dwarf_calling_convention, but because of forward declarations
1981 and not wanting to include dwarf2.h everywhere target.h is included
1982 the function is being declared as an int. */
1984 (dwarf_calling_convention,
1986 int, (const_tree function),
1987 hook_int_const_tree_0)
1989 /* This target hook allows the backend to emit frame-related insns that
1990 contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info
1991 engine will invoke it on insns of the form
1992 (set (reg) (unspec [...] UNSPEC_INDEX))
1994 (set (reg) (unspec_volatile [...] UNSPECV_INDEX))
1995 to let the backend emit the call frame instructions. */
1997 (dwarf_handle_frame_unspec,
1999 void, (const char *label, rtx pattern, int index), NULL)
2001 /* ??? Documenting this hook requires a GFDL license grant. */
2003 (stdarg_optimize_hook,
2004 "Perform architecture specific checking of statements gimplified\
2005 from @code{VA_ARG_EXPR}. @var{stmt} is the statement. Returns true if\
2006 the statement doesn't need to be checked for @code{va_list} references.",
2007 bool, (struct stdarg_info *ai, const_gimple stmt), NULL)
2009 /* This target hook allows the operating system to override the DECL
2010 that represents the external variable that contains the stack
2011 protection guard variable. The type of this DECL is ptr_type_node. */
2013 (stack_protect_guard,
2016 default_stack_protect_guard)
2018 /* This target hook allows the operating system to override the CALL_EXPR
2019 that is invoked when a check vs the guard variable fails. */
2021 (stack_protect_fail,
2024 default_external_stack_protect_fail)
2026 /* Returns NULL if target supports the insn within a doloop block,
2027 otherwise it returns an error message. */
2029 (invalid_within_doloop,
2031 const char *, (const_rtx insn),
2032 default_invalid_within_doloop)
2034 /* Returns true for a legitimate combined insn. */
2036 (legitimate_combined_insn,
2037 "Take an instruction in @var{insn} and return @code{false} if the instruction\
2038 is not appropriate as a combination of two or more instructions. The\
2039 default is to accept all instructions.",
2044 (valid_dllimport_attribute_p,
2045 "@var{decl} is a variable or function with @code{__attribute__((dllimport))}\
2046 specified. Use this hook if the target needs to add extra validation\
2047 checks to @code{handle_dll_attribute}.",
2048 bool, (const_tree decl),
2049 hook_bool_const_tree_true)
2051 /* If non-zero, align constant anchors in CSE to a multiple of this
2056 unsigned HOST_WIDE_INT, 0)
2058 /* Defines, which target-dependent bits (upper 16) are used by port */
2062 unsigned HOST_WIDE_INT, (unsigned HOST_WIDE_INT val), NULL)
2064 /* Defines an offset bitwise ored into shifted address to get corresponding
2065 Address Sanitizer shadow address, or -1 if Address Sanitizer is not
2066 supported by the target. */
2068 (asan_shadow_offset,
2069 "Return the offset bitwise ored into shifted address to get corresponding\n\
2070 Address Sanitizer shadow memory address. NULL if Address Sanitizer is not\n\
2071 supported by the target.",
2072 unsigned HOST_WIDE_INT, (void),
2075 /* Functions relating to calls - argument passing, returns, etc. */
2076 /* Members of struct call have no special macro prefix. */
2077 HOOK_VECTOR (TARGET_CALLS, calls)
2080 (promote_function_mode,
2082 enum machine_mode, (const_tree type, enum machine_mode mode, int *punsignedp,
2083 const_tree funtype, int for_return),
2084 default_promote_function_mode)
2087 (promote_prototypes,
2089 bool, (const_tree fntype),
2090 hook_bool_const_tree_false)
2095 rtx, (tree fndecl, int incoming),
2096 hook_rtx_tree_int_null)
2100 bool, (const_tree type, const_tree fntype),
2101 default_return_in_memory)
2106 bool, (const_tree type),
2107 hook_bool_const_tree_false)
2109 /* Return true if a parameter must be passed by reference. TYPE may
2110 be null if this is a libcall. CA may be null if this query is
2111 from __builtin_va_arg. */
2116 (cumulative_args_t cum, enum machine_mode mode, const_tree type, bool named),
2117 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
2120 (expand_builtin_saveregs,
2123 default_expand_builtin_saveregs)
2125 /* Returns pretend_argument_size. */
2127 (setup_incoming_varargs,
2129 void, (cumulative_args_t args_so_far, enum machine_mode mode, tree type,
2130 int *pretend_args_size, int second_time),
2131 default_setup_incoming_varargs)
2134 (strict_argument_naming,
2136 bool, (cumulative_args_t ca),
2137 hook_bool_CUMULATIVE_ARGS_false)
2139 /* Returns true if we should use
2140 targetm.calls.setup_incoming_varargs() and/or
2141 targetm.calls.strict_argument_naming(). */
2143 (pretend_outgoing_varargs_named,
2145 bool, (cumulative_args_t ca),
2146 default_pretend_outgoing_varargs_named)
2148 /* Given a complex type T, return true if a parameter of type T
2149 should be passed as two scalars. */
2153 bool, (const_tree type), NULL)
2155 /* Return true if type T, mode MODE, may not be passed in registers,
2156 but must be passed on the stack. */
2157 /* ??? This predicate should be applied strictly after pass-by-reference.
2158 Need audit to verify that this is the case. */
2160 (must_pass_in_stack,
2162 bool, (enum machine_mode mode, const_tree type),
2163 must_pass_in_stack_var_size_or_pad)
2165 /* Return true if type TYPE, mode MODE, which is passed by reference,
2166 should have the object copy generated by the callee rather than
2167 the caller. It is never called for TYPE requiring constructors. */
2172 (cumulative_args_t cum, enum machine_mode mode, const_tree type, bool named),
2173 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
2175 /* Return zero for arguments passed entirely on the stack or entirely
2176 in registers. If passed in both, return the number of bytes passed
2177 in registers; the balance is therefore passed on the stack. */
2181 int, (cumulative_args_t cum, enum machine_mode mode, tree type, bool named),
2182 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0)
2184 /* Update the state in CA to advance past an argument in the
2185 argument list. The values MODE, TYPE, and NAMED describe that
2188 (function_arg_advance,
2191 (cumulative_args_t ca, enum machine_mode mode, const_tree type, bool named),
2192 default_function_arg_advance)
2194 /* Return zero if the argument described by the state of CA should
2195 be placed on a stack, or a hard register in which to store the
2196 argument. The values MODE, TYPE, and NAMED describe that
2201 rtx, (cumulative_args_t ca, enum machine_mode mode, const_tree type,
2203 default_function_arg)
2205 /* Likewise, but for machines with register windows. Return the
2206 location where the argument will appear to the callee. */
2208 (function_incoming_arg,
2210 rtx, (cumulative_args_t ca, enum machine_mode mode, const_tree type,
2212 default_function_incoming_arg)
2215 (function_arg_boundary,
2217 unsigned int, (enum machine_mode mode, const_tree type),
2218 default_function_arg_boundary)
2221 (function_arg_round_boundary,
2222 "Normally, the size of an argument is rounded up to @code{PARM_BOUNDARY},\n\
2223 which is the default value for this hook. You can define this hook to\n\
2224 return a different value if an argument size must be rounded to a larger\n\
2226 unsigned int, (enum machine_mode mode, const_tree type),
2227 default_function_arg_round_boundary)
2229 /* Return the diagnostic message string if function without a prototype
2230 is not allowed for this 'val' argument; NULL otherwise. */
2232 (invalid_arg_for_unprototyped_fn,
2234 const char *, (const_tree typelist, const_tree funcdecl, const_tree val),
2235 hook_invalid_arg_for_unprototyped_fn)
2237 /* Return an rtx for the return value location of the function
2238 specified by FN_DECL_OR_TYPE with a return type of RET_TYPE. */
2242 rtx, (const_tree ret_type, const_tree fn_decl_or_type, bool outgoing),
2243 default_function_value)
2245 /* Return the rtx for the result of a libcall of mode MODE,
2246 calling the function FN_NAME. */
2250 rtx, (enum machine_mode mode, const_rtx fun),
2251 default_libcall_value)
2253 /* Return true if REGNO is a possible register number for
2254 a function value as seen by the caller. */
2256 (function_value_regno_p,
2258 bool, (const unsigned int regno),
2259 default_function_value_regno_p)
2261 /* ??? Documenting this hook requires a GFDL license grant. */
2263 (internal_arg_pointer,
2264 "Return an rtx for the argument pointer incoming to the\
2267 default_internal_arg_pointer)
2269 /* Update the current function stack boundary if needed. */
2271 (update_stack_boundary,
2275 /* Handle stack alignment and return an rtx for Dynamic Realign
2276 Argument Pointer if necessary. */
2282 /* Return true if all function parameters should be spilled to the
2285 (allocate_stack_slots_for_args,
2288 hook_bool_void_true)
2290 /* Return an rtx for the static chain for FNDECL. If INCOMING_P is true,
2291 then it should be for the callee; otherwise for the caller. */
2295 rtx, (const_tree fndecl, bool incoming_p),
2296 default_static_chain)
2298 /* Fill in the trampoline at MEM with a call to FNDECL and a
2299 static chain value of CHAIN. */
2303 void, (rtx m_tramp, tree fndecl, rtx static_chain),
2304 default_trampoline_init)
2306 /* Adjust the address of the trampoline in a target-specific way. */
2308 (trampoline_adjust_address,
2310 rtx, (rtx addr), NULL)
2312 /* Return the number of bytes of its own arguments that a function
2313 pops on returning, or 0 if the function pops no arguments and the
2314 caller must therefore pop them all after the function returns. */
2315 /* ??? tm.texi has no types for the parameters. */
2319 int, (tree fundecl, tree funtype, int size),
2320 default_return_pops_args)
2322 /* Return a mode wide enough to copy any function value that might be
2325 (get_raw_result_mode,
2326 "This target hook returns the mode to be used when accessing raw return\
2327 registers in @code{__builtin_return}. Define this macro if the value\
2328 in @var{reg_raw_mode} is not correct.",
2329 enum machine_mode, (int regno),
2330 default_get_reg_raw_mode)
2332 /* Return a mode wide enough to copy any argument value that might be
2336 "This target hook returns the mode to be used when accessing raw argument\
2337 registers in @code{__builtin_apply_args}. Define this macro if the value\
2338 in @var{reg_raw_mode} is not correct.",
2339 enum machine_mode, (int regno),
2340 default_get_reg_raw_mode)
2342 HOOK_VECTOR_END (calls)
2344 /* Return the diagnostic message string if conversion from FROMTYPE
2345 to TOTYPE is not allowed, NULL otherwise. */
2347 (invalid_conversion,
2349 const char *, (const_tree fromtype, const_tree totype),
2350 hook_constcharptr_const_tree_const_tree_null)
2352 /* Return the diagnostic message string if the unary operation OP is
2353 not permitted on TYPE, NULL otherwise. */
2357 const char *, (int op, const_tree type),
2358 hook_constcharptr_int_const_tree_null)
2360 /* Return the diagnostic message string if the binary operation OP
2361 is not permitted on TYPE1 and TYPE2, NULL otherwise. */
2365 const char *, (int op, const_tree type1, const_tree type2),
2366 hook_constcharptr_int_const_tree_const_tree_null)
2368 /* Return the diagnostic message string if TYPE is not valid as a
2369 function parameter type, NULL otherwise. */
2371 (invalid_parameter_type,
2373 const char *, (const_tree type),
2374 hook_constcharptr_const_tree_null)
2376 /* Return the diagnostic message string if TYPE is not valid as a
2377 function return type, NULL otherwise. */
2379 (invalid_return_type,
2381 const char *, (const_tree type),
2382 hook_constcharptr_const_tree_null)
2384 /* If values of TYPE are promoted to some other type when used in
2385 expressions (analogous to the integer promotions), return that type,
2386 or NULL_TREE otherwise. */
2390 tree, (const_tree type),
2391 hook_tree_const_tree_null)
2393 /* Convert EXPR to TYPE, if target-specific types with special conversion
2394 rules are involved. Return the converted expression, or NULL to apply
2395 the standard conversion rules. */
2399 tree, (tree type, tree expr),
2400 hook_tree_tree_tree_null)
2402 /* Return true if we use LRA instead of reload. */
2405 "A target hook which returns true if we use LRA instead of reload pass.\
2406 It means that LRA was ported to the target.\
2408 The default version of this target hook returns always false.",
2412 /* Return register priority of given hard regno for the current target. */
2415 "A target hook which returns the register priority number to which the\
2416 register @var{hard_regno} belongs to. The bigger the number, the\
2417 more preferable the hard register usage (when all other conditions are\
2418 the same). This hook can be used to prefer some hard register over\
2419 others in LRA. For example, some x86-64 register usage needs\
2420 additional prefix which makes instructions longer. The hook can\
2421 return lower priority number for such registers make them less favorable\
2422 and as result making the generated code smaller.\
2424 The default version of this target hook returns always zero.",
2426 default_register_priority)
2428 /* Return true if maximal address displacement can be different. */
2430 (different_addr_displacement_p,
2431 "A target hook which returns true if an address with the same structure\
2432 can have different maximal legitimate displacement. For example, the\
2433 displacement can depend on memory mode or on operand combinations in\
2436 The default version of this target hook returns always false.",
2438 default_different_addr_displacement_p)
2440 /* Determine class for spilling pseudos of given mode into registers
2441 instead of memory. */
2444 "This hook defines a class of registers which could be used for spilling\
2445 pseudos of the given mode and class, or @code{NO_REGS} if only memory\
2446 should be used. Not defining this hook is equivalent to returning\
2447 @code{NO_REGS} for all inputs.",
2448 reg_class_t, (reg_class_t, enum machine_mode),
2451 /* True if a structure, union or array with MODE containing FIELD should
2452 be accessed using BLKmode. */
2454 (member_type_forces_blk,
2456 bool, (const_tree field, enum machine_mode mode),
2457 default_member_type_forces_blk)
2459 /* Return the class for a secondary reload, and fill in extra information. */
2464 (bool in_p, rtx x, reg_class_t reload_class, enum machine_mode reload_mode,
2465 secondary_reload_info *sri),
2466 default_secondary_reload)
2468 /* Given an rtx X being reloaded into a reg required to be in class CLASS,
2469 return the class of reg to actually use. */
2471 (preferred_reload_class,
2474 (rtx x, reg_class_t rclass),
2475 default_preferred_reload_class)
2477 /* Like TARGET_PREFERRED_RELOAD_CLASS, but for output reloads instead of
2480 (preferred_output_reload_class,
2483 (rtx x, reg_class_t rclass),
2484 default_preferred_output_reload_class)
2487 (class_likely_spilled_p,
2489 bool, (reg_class_t rclass),
2490 default_class_likely_spilled_p)
2492 /* Return the maximum number of consecutive registers
2493 needed to represent mode MODE in a register of class RCLASS. */
2497 unsigned char, (reg_class_t rclass, enum machine_mode mode),
2498 default_class_max_nregs)
2501 (preferred_rename_class,
2502 "A target hook that places additional preference on the register\
2503 class to use when it is necessary to rename a register in class\
2504 @var{rclass} to another class, or perhaps @var{NO_REGS}, if no\
2505 preferred register class is found or hook @code{preferred_rename_class}\
2506 is not implemented.\
2507 Sometimes returning a more restrictive class makes better code. For\
2508 example, on ARM, thumb-2 instructions using @code{LO_REGS} may be\
2509 smaller than instructions using @code{GENERIC_REGS}. By returning\
2510 @code{LO_REGS} from @code{preferred_rename_class}, code size can\
2512 reg_class_t, (reg_class_t rclass),
2513 default_preferred_rename_class)
2515 /* This target hook allows the backend to perform additional
2516 processing while initializing for variable expansion. */
2518 (expand_to_rtl_hook,
2523 /* This target hook allows the backend to perform additional
2524 instantiations on rtx that are not actually in insns yet,
2525 but will be later. */
2532 /* Return true if is OK to use a hard register REGNO as scratch register
2535 (hard_regno_scratch_ok,
2537 bool, (unsigned int regno),
2538 default_hard_regno_scratch_ok)
2540 /* Return the smallest number of different values for which it is best to
2541 use a jump-table instead of a tree of conditional branches. */
2543 (case_values_threshold,
2545 unsigned int, (void),
2546 default_case_values_threshold)
2548 /* Retutn true if a function must have and use a frame pointer. */
2550 (frame_pointer_required,
2553 hook_bool_void_false)
2555 /* Returns true if the compiler is allowed to try to replace register number
2556 from-reg with register number to-reg. */
2560 bool, (const int from_reg, const int to_reg),
2561 hook_bool_const_int_const_int_true)
2563 /* Modify any or all of fixed_regs, call_used_regs, global_regs,
2564 reg_names, and reg_class_contents to account of the vagaries of the
2567 (conditional_register_usage,
2572 /* Functions specific to the C family of frontends. */
2574 #define HOOK_PREFIX "TARGET_C_"
2575 HOOK_VECTOR (TARGET_C, c)
2577 /* ??? Documenting this hook requires a GFDL license grant. */
2580 "Return machine mode for non-standard constant literal suffix @var{c},\
2581 or VOIDmode if non-standard suffixes are unsupported.",
2582 enum machine_mode, (char c),
2583 default_mode_for_suffix)
2587 /* Functions specific to the C++ frontend. */
2589 #define HOOK_PREFIX "TARGET_CXX_"
2590 HOOK_VECTOR (TARGET_CXX, cxx)
2592 /* Return the integer type used for guard variables. */
2597 default_cxx_guard_type)
2599 /* Return true if only the low bit of the guard should be tested. */
2604 hook_bool_void_false)
2606 /* Returns the size of the array cookie for an array of type. */
2611 default_cxx_get_cookie_size)
2613 /* Returns true if the element size should be stored in the array cookie. */
2618 hook_bool_void_false)
2620 /* Allows backends to perform additional processing when
2621 deciding if a class should be exported or imported. */
2623 (import_export_class,
2625 int, (tree type, int import_export), NULL)
2627 /* Returns true if constructors and destructors return "this". */
2629 (cdtor_returns_this,
2632 hook_bool_void_false)
2634 /* Returns true if the key method for a class can be an inline
2635 function, so long as it is not declared inline in the class
2636 itself. Returning true is the behavior required by the Itanium C++ ABI. */
2638 (key_method_may_be_inline,
2641 hook_bool_void_true)
2644 (determine_class_data_visibility,
2645 "@var{decl} is a virtual table, virtual table table, typeinfo object,\
2646 or other similar implicit class data object that will be emitted with\
2647 external linkage in this translation unit. No ELF visibility has been\
2648 explicitly specified. If the target needs to specify a visibility\
2649 other than that of the containing class, use this hook to set\
2650 @code{DECL_VISIBILITY} and @code{DECL_VISIBILITY_SPECIFIED}.",
2654 /* Returns true (the default) if virtual tables and other
2655 similar implicit class data objects are always COMDAT if they
2656 have external linkage. If this hook returns false, then
2657 class data for classes whose virtual table will be emitted in
2658 only one translation unit will not be COMDAT. */
2660 (class_data_always_comdat,
2663 hook_bool_void_true)
2665 /* Returns true (the default) if the RTTI for the basic types,
2666 which is always defined in the C++ runtime, should be COMDAT;
2667 false if it should not be COMDAT. */
2669 (library_rtti_comdat,
2672 hook_bool_void_true)
2674 /* Returns true if __aeabi_atexit should be used to register static
2680 hook_bool_void_false)
2682 /* Returns true if target may use atexit in the same manner as
2683 __cxa_atexit to register static destructors. */
2685 (use_atexit_for_cxa_atexit,
2688 hook_bool_void_false)
2691 (adjust_class_at_definition,
2692 "@var{type} is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that has just\
2693 been defined. Use this hook to make adjustments to the class (eg, tweak\
2694 visibility or perform any other required target modifications).",
2699 (decl_mangling_context,
2700 "Return target-specific mangling context of @var{decl} or @code{NULL_TREE}.",
2701 tree, (const_tree decl),
2702 hook_tree_const_tree_null)
2704 HOOK_VECTOR_END (cxx)
2706 /* Functions and data for emulated TLS support. */
2708 #define HOOK_PREFIX "TARGET_EMUTLS_"
2709 HOOK_VECTOR (TARGET_EMUTLS, emutls)
2711 /* Name of the address and common functions. */
2715 const char *, "__builtin___emutls_get_address")
2720 const char *, "__builtin___emutls_register_common")
2722 /* Prefixes for proxy variable and template. */
2733 /* Prefixes for proxy variable and template. */
2744 /* Function to generate field definitions of the proxy variable. */
2748 tree, (tree type, tree *name),
2749 default_emutls_var_fields)
2751 /* Function to initialize a proxy variable. */
2755 tree, (tree var, tree decl, tree tmpl_addr),
2756 default_emutls_var_init)
2758 /* Whether we are allowed to alter the usual alignment of the
2765 /* Whether we can emit debug information for TLS vars. */
2767 (debug_form_tls_address,
2771 HOOK_VECTOR_END (emutls)
2774 #define HOOK_PREFIX "TARGET_OPTION_"
2775 HOOK_VECTOR (TARGET_OPTION_HOOKS, target_option_hooks)
2777 /* Function to validate the attribute((target(...))) strings. If
2778 the option is validated, the hook should also fill in
2779 DECL_FUNCTION_SPECIFIC_TARGET in the function decl node. */
2783 bool, (tree fndecl, tree name, tree args, int flags),
2784 default_target_option_valid_attribute_p)
2786 /* Function to save any extra target state in the target options structure. */
2790 void, (struct cl_target_option *ptr), NULL)
2792 /* Function to restore any extra target state from the target options
2797 void, (struct cl_target_option *ptr), NULL)
2799 /* Function to print any extra target state from the target options
2804 void, (FILE *file, int indent, struct cl_target_option *ptr), NULL)
2806 /* Function to parse arguments to be validated for #pragma target, and to
2807 change the state if the options are valid. If the first argument is
2808 NULL, the second argument specifies the default options to use. Return
2809 true if the options are valid, and set the current state. */
2813 bool, (tree args, tree pop_target),
2814 default_target_option_pragma_parse)
2816 /* Do option overrides for the target. */
2823 /* This function returns true if DECL1 and DECL2 are versions of the same
2824 function. DECL1 and DECL2 are function versions if and only if they
2825 have the same function signature and different target specific attributes,
2826 that is, they are compiled for different target machines. */
2830 bool, (tree decl1, tree decl2),
2831 hook_bool_tree_tree_false)
2833 /* Function to determine if one function can inline another function. */
2835 #define HOOK_PREFIX "TARGET_"
2839 bool, (tree caller, tree callee),
2840 default_target_can_inline_p)
2842 HOOK_VECTOR_END (target_option)
2844 /* For targets that need to mark extra registers as live on entry to
2845 the function, they should define this target hook and set their
2846 bits in the bitmap passed in. */
2848 (extra_live_on_entry,
2850 void, (bitmap regs),
2853 /* Fill in additional registers set up by prologue into a regset. */
2855 (set_up_by_prologue,
2856 "This hook should add additional registers that are computed by the prologue\
2857 to the hard regset for shrink-wrapping optimization purposes.",
2858 void, (struct hard_reg_set_container *),
2861 /* For targets that have attributes that can affect whether a
2862 function's return statements need checking. For instance a 'naked'
2863 function attribute. */
2866 "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.",
2868 hook_bool_tree_true)
2870 /* Determine the type of unwind info to emit for debugging. */
2874 enum unwind_info_type, (void),
2875 default_debug_unwind_info)
2877 /* The code parameter should be of type enum rtx_code but this is not
2878 defined at this time. */
2880 (canonicalize_comparison,
2882 void, (int *code, rtx *op0, rtx *op1, bool op0_preserve_value),
2883 default_canonicalize_comparison)
2886 (atomic_test_and_set_trueval,
2887 "This value should be set if the result written by\
2888 @code{atomic_test_and_set} is not exactly 1, i.e. the\
2889 @code{bool} @code{true}.",
2892 /* Leave the boolean fields at the end. */
2894 /* True if we can create zeroed data by switching to a BSS section
2895 and then using ASM_OUTPUT_SKIP to allocate the space. */
2897 (have_switchable_bss_sections,
2901 /* True if "native" constructors and destructors are supported,
2902 false if we're using collect2 for the job. */
2908 /* True if thread-local storage is supported. */
2914 /* True if a small readonly data section is supported. */
2916 (have_srodata_section,
2920 /* True if EH frame info sections should be zero-terminated. */
2922 (terminate_dw2_eh_frame_info,
2926 /* True if #NO_APP should be emitted at the beginning of assembly output. */
2928 (asm_file_start_app_off,
2932 /* True if output_file_directive should be called for main_input_filename
2933 at the beginning of assembly output. */
2935 (asm_file_start_file_directive,
2939 /* True if the target is allowed to reorder memory accesses unless
2940 synchronization is explicitly requested. */
2946 /* Returns true if we should generate exception tables for use with the
2947 ARM EABI. The effects the encoding of function exception specifications. */
2954 (want_debug_pub_sections,
2955 "True if the @code{.debug_pubtypes} and @code{.debug_pubnames} sections\
2956 should be emitted. These sections are not used on most platforms, and\
2957 in particular GDB does not use them.",
2962 "True if the @code{DW_AT_comp_dir} attribute should be emitted for each \
2963 compilation unit. This attribute is required for the darwin linker \
2964 to emit debug information.",
2968 (delay_sched2, "True if sched2 is not to be run at its normal place. \
2969 This usually means it will be run as part of machine-specific reorg.",
2973 (delay_vartrack, "True if vartrack is not to be run at its normal place. \
2974 This usually means it will be run as part of machine-specific reorg.",
2977 /* Leave the boolean fields at the end. */
2979 /* Close the 'struct gcc_target' definition. */
2980 HOOK_VECTOR_END (C90_EMPTY_HACK)
projects / platform / upstream / gcc48.git / blob