1 /* Target hook definitions.
2 Copyright (C
) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation
, Inc.
5 This program is free software
; you can redistribute it and
/or modify it
6 under the terms of the GNU General Public License as published by the
7 Free Software Foundation
; either version
3, or (at your option
) any
10 This program is distributed in the hope that it will be useful
,
11 but WITHOUT ANY WARRANTY
; without even the implied warranty of
12 MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program
; see the file COPYING3. If not see
17 <http
://www.gnu.org
/licenses
/>.
19 In other words
, you are welcome to use
, share and improve this program.
20 You are forbidden to forbid anyone else to use
, share and improve
21 what you give them. Help stamp out software
-hoarding
! */
23 /* The following macros should be provided by the including file
:
25 DEFHOOK(NAME
, DOC
, TYPE, PARAMS
, INIT
): Define a function
-valued hook.
26 DEFHOOKPOD(DOC
, TYPE, NAME
, INIT
): Define a piece
-of
-data
'hook'.
*/
28 /* Defaults for optional macros
:
29 DEFHOOKPODX(NAME
, TYPE, INIT
): Like DEFHOOKPOD
, but share documentation
30 with the previous
'hook'.
*/
32 #define
DEFHOOKPODX(NAME
, TYPE, INIT
) DEFHOOKPOD (NAME
, 0, TYPE, INIT
)
35 /* HOOKSTRUCT(FRAGMENT
): Declarator fragments to encapsulate all the
36 members into a struct gcc_target
, which in turn contains several
39 #define
HOOKSTRUCT(FRAGMENT
)
41 /* HOOK_VECTOR
: Start a struct declaration
, which then gets its own initializer.
42 HOOK_VECTOR_END
: Close a struct declaration
, providing a member declarator
43 name for nested use.
*/
45 #define
HOOK_VECTOR_1(NAME
, FRAGMENT
) HOOKSTRUCT(FRAGMENT
)
47 #define
HOOK_VECTOR(INIT_NAME
, SNAME
) HOOK_VECTOR_1 (INIT_NAME
, struct SNAME
{)
48 #define
HOOK_VECTOR_END(DECL_NAME
) HOOK_VECTOR_1(,} DECL_NAME
;)
50 HOOK_VECTOR (TARGET_INITIALIZER
, gcc_target
)
52 /* FIXME
: For pre
-existing hooks
, we can
't place the documentation in the
53 documentation field here till we get permission from the FSF to include
54 it in GPLed software - the target hook documentation is so far only
55 available under the GFDL. */
57 /* A hook should generally be documented by a string in the DOC parameter,
58 which should contain texinfo markup. If the documentation is only available
59 under the GPL, but not under the GFDL, put it in a comment above the hook
60 definition. If the function declaration is available both under GPL and
61 GFDL, but the documentation is only available under the GFDL, put the
62 documentaton in tm.texi.in, heading with @hook <hookname> and closing
63 the paragraph with @end deftypefn / deftypevr as appropriate, and marking
64 the next autogenerated hook with @hook <hookname>.
65 In both these cases, leave the DOC string empty, i.e. "".
66 Sometimes, for some historic reason the function declaration
67 has to be documented differently
68 than what it is. In that case, use DEFHOOK_UNDOC to supress auto-generation
69 of documentation. DEFHOOK_UNDOC takes a DOC string which it ignores, so
70 you can put GPLed documentation string there if you have hopes that you
71 can clear the declaration & documentation for GFDL distribution later,
72 in which case you can then simply change the DEFHOOK_UNDOC to DEFHOOK
73 to turn on the autogeneration of the documentation.
75 A documentation string of "*" means not to emit any documentation at all,
76 and is mainly used internally for DEFHOOK_UNDOC. It should generally not
77 be used otherwise, but it has its use for exceptional cases where automatic
78 documentation is not wanted, and the real documentation is elsewere, like
79 for TARGET_ASM_{,UN}ALIGNED_INT_OP, which are hooks only for implementation
80 purposes; they refer to structs, the components of which are documented as
81 separate hooks TARGET_ASM_{,UN}ALIGNED_[HSDT]I_OP.
82 A DOC string of 0 is for internal use of DEFHOOKPODX and special table
85 /* Functions that output assembler for the target. */
86 #define HOOK_PREFIX "TARGET_ASM_"
87 HOOK_VECTOR (TARGET_ASM_OUT, asm_out)
89 /* Opening and closing parentheses for asm expression grouping. */
94 DEFHOOKPODX (close_paren, const char *, ")")
96 /* Assembler instructions for creating various kinds of integer object. */
100 const char *, "\t.byte\t")
101 DEFHOOKPOD (aligned_op, "*", struct asm_int_op, TARGET_ASM_ALIGNED_INT_OP)
102 DEFHOOKPOD (unaligned_op, "*", struct asm_int_op, TARGET_ASM_UNALIGNED_INT_OP)
104 /* The maximum number of bytes to skip when applying
105 LABEL_ALIGN_AFTER_BARRIER. */
107 (label_align_after_barrier_max_skip,
110 default_label_align_after_barrier_max_skip)
112 /* The maximum number of bytes to skip when applying
115 (loop_align_max_skip,
118 default_loop_align_max_skip)
120 /* The maximum number of bytes to skip when applying
123 (label_align_max_skip,
126 default_label_align_max_skip)
128 /* The maximum number of bytes to skip when applying
131 (jump_align_max_skip,
134 default_jump_align_max_skip)
136 /* Try to output the assembler code for an integer object whose
137 value is given by X. SIZE is the size of the object in bytes and
138 ALIGNED_P indicates whether it is aligned. Return true if
139 successful. Only handles cases for which BYTE_OP, ALIGNED_OP
140 and UNALIGNED_OP are NULL. */
144 /* Only handles cases for which BYTE_OP, ALIGNED_OP and UNALIGNED_OP are
146 bool, (rtx x, unsigned int size, int aligned_p),
147 default_assemble_integer)
149 /* Output code that will globalize a label. */
153 void, (FILE *stream, const char *name),
154 default_globalize_label)
156 /* Output code that will globalize a declaration. */
158 (globalize_decl_name,
160 void, (FILE *stream, tree decl), default_globalize_decl_name)
162 /* Output code that will emit a label for unwind info, if this
163 target requires such labels. Second argument is the decl the
164 unwind info is associated with, third is a boolean: true if
165 this is for exception handling, fourth is a boolean: true if
166 this is only a placeholder for an omitted FDE. */
170 void, (FILE *stream, tree decl, int for_eh, int empty),
171 default_emit_unwind_label)
173 /* Output code that will emit a label to divide up the exception table. */
175 (emit_except_table_label,
177 void, (FILE *stream),
178 default_emit_except_table_label)
180 /* Emit a directive for setting the personality for the function. */
182 (emit_except_personality,
183 "If the target implements @code{TARGET_ASM_UNWIND_EMIT}, this hook may be\
184 used to emit a directive to install a personality hook into the unwind\
185 info. This hook should not be used if dwarf2 unwind info is used.",
186 void, (rtx personality),
189 /* Emit any directives required to unwind this instruction. */
193 void, (FILE *stream, rtx insn),
197 (unwind_emit_before_insn,
198 "True if the @code{TARGET_ASM_UNWIND_EMIT} hook should be called before\
199 the assembly for @var{insn} has been emitted, false if the hook should\
200 be called afterward.",
203 /* Output an internal label. */
207 void, (FILE *stream, const char *prefix, unsigned long labelno),
208 default_internal_label)
210 /* Output label for the constant. */
212 (declare_constant_name,
214 void, (FILE *file, const char *name, const_tree expr, HOST_WIDE_INT size),
215 default_asm_declare_constant_name)
217 /* Emit a ttype table reference to a typeinfo object. */
224 /* Emit an assembler directive to set visibility for the symbol
225 associated with the tree decl. */
227 (assemble_visibility,
229 void, (tree decl, int visibility),
230 default_assemble_visibility)
232 /* Output the assembler code for entry to a function. */
236 void, (FILE *file, HOST_WIDE_INT size),
237 default_function_pro_epilogue)
239 /* Output the assembler code for end of prologue. */
241 (function_end_prologue,
246 /* Output the assembler code for start of epilogue. */
248 (function_begin_epilogue,
253 /* Output the assembler code for function exit. */
257 void, (FILE *file, HOST_WIDE_INT size),
258 default_function_pro_epilogue)
260 /* Initialize target-specific sections. */
267 /* Tell assembler to change to section NAME with attributes FLAGS.
268 If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with
269 which this section is associated. */
273 void, (const char *name, unsigned int flags, tree decl),
274 default_no_named_section)
276 /* Return a mask describing how relocations should be treated when
277 selecting sections. Bit 1 should be set if global relocations
278 should be placed in a read-write section; bit 0 should be set if
279 local relocations should be placed in a read-write section. */
284 default_reloc_rw_mask)
286 /* Return a section for EXP. It may be a DECL or a constant. RELOC
287 is nonzero if runtime relocations must be applied; bit 1 will be
288 set if the runtime relocations require non-local name resolution.
289 ALIGN is the required alignment of the data. */
293 section *, (tree exp, int reloc, unsigned HOST_WIDE_INT align),
294 default_select_section)
296 /* Return a section for X. MODE is X's mode and ALIGN is its
297 alignment in bits.
*/
301 section
*, (enum machine_mode mode
, rtx x
, unsigned HOST_WIDE_INT align
),
302 default_select_rtx_section
)
304 /* Select a unique section name for DECL. RELOC is the same as
305 for SELECT_SECTION.
*/
309 void
, (tree decl
, int reloc
),
310 default_unique_section
)
312 /* Return the readonly data section associated with function DECL.
*/
314 (function_rodata_section
,
316 section
*, (tree decl
),
317 default_function_rodata_section
)
319 /* Output a constructor for a symbol with a given priority.
*/
323 void
, (rtx symbol
, int priority
), NULL
)
325 /* Output a destructor for a symbol with a given priority.
*/
329 void
, (rtx symbol
, int priority
), NULL
)
331 /* Output the assembler code for a thunk function. THUNK_DECL is the
332 declaration for the thunk function itself
, FUNCTION is the decl for
333 the target function. DELTA is an immediate constant offset to be
334 added to THIS. If VCALL_OFFSET is nonzero
, the word at
335 *(*this + vcall_offset) should be added to THIS. */
339 void, (FILE *file, tree thunk_fndecl, HOST_WIDE_INT delta,
340 HOST_WIDE_INT vcall_offset, tree function),
343 /* Determine whether output_mi_thunk would succeed. */
344 /* ??? Ideally, this hook would not exist, and success or failure
345 would be returned from output_mi_thunk directly. But there's
346 too much undo-able setup involved in invoking output_mi_thunk.
347 Could be fixed by making output_mi_thunk emit rtl instead of
348 text to the output file. */
350 (can_output_mi_thunk,
352 bool, (const_tree thunk_fndecl, HOST_WIDE_INT delta,
353 HOST_WIDE_INT vcall_offset, const_tree function),
354 hook_bool_const_tree_hwi_hwi_const_tree_false)
356 /* Output any boilerplate text needed at the beginning of a
364 /* Output any boilerplate text needed at the end of a translation unit. */
371 /* Output any boilerplate text needed at the beginning of an
372 LTO output stream. */
379 /* Output any boilerplate text needed at the end of an
380 LTO output stream. */
387 /* Output any boilerplace text needed at the end of a
388 translation unit before debug and unwind info is emitted. */
395 /* Output an assembler pseudo-op to declare a library function name
401 default_external_libcall)
403 /* Output an assembler directive to mark decl live. This instructs
404 linker to not dead code strip this symbol. */
406 (mark_decl_preserved,
408 void, (const char *symbol),
409 hook_void_constcharptr)
411 /* Output a record of the command line switches that have been passed. */
413 (record_gcc_switches,
415 int, (print_switch_type type, const char *text),
418 /* The name of the section that the example ELF implementation of
419 record_gcc_switches will use to store the information. Target
420 specific versions of record_gcc_switches may or may not use
423 (record_gcc_switches_section,
425 const char *, ".GCC.command.line")
427 /* Output the definition of a section anchor. */
432 default_asm_output_anchor)
434 /* Output a DTP-relative reference to a TLS symbol. */
436 (output_dwarf_dtprel,
438 void, (FILE *file, int size, rtx x),
441 /* Some target machines need to postscan each insn after it is output. */
443 (final_postscan_insn,
445 void, (FILE *file, rtx insn, rtx *opvec, int noperands),
448 /* Emit the trampoline template. This hook may be NULL. */
450 (trampoline_template,
456 (output_source_filename,
457 "Output COFF information or DWARF debugging information which indicates\
458 that filename @var{name} is the current source file to the stdio\
459 stream @var{file}.\n\
461 This target hook need not be defined if the standard form of output\
462 for the file format in use is appropriate.",
463 void ,(FILE *file, const char *name),
464 default_asm_output_source_filename)
467 (output_addr_const_extra,
469 bool, (FILE *file, rtx x),
470 default_asm_output_addr_const_extra)
472 /* ??? The TARGET_PRINT_OPERAND* hooks are part of the asm_out struct,
473 even though that is not reflected in the macro name to override their
476 #define HOOK_PREFIX "TARGET_"
478 /* Emit a machine-specific insn operand. */
479 /* ??? tm.texi only documents the old macro PRINT_OPERAND,
480 not this hook, and uses a different name for the argument FILE. */
484 void, (FILE *file, rtx x, int code),
485 default_print_operand)
487 /* Emit a machine-specific memory address. */
488 /* ??? tm.texi only documents the old macro PRINT_OPERAND_ADDRESS,
489 not this hook, and uses different argument names. */
491 (print_operand_address,
493 void, (FILE *file, rtx addr),
494 default_print_operand_address)
496 /* Determine whether CODE is a valid punctuation character for the
497 `print_operand' hook. */
498 /* ??? tm.texi only documents the old macro PRINT_OPERAND_PUNCT_VALID_P,
501 (print_operand_punct_valid_p,
503 bool ,(unsigned char code),
504 default_print_operand_punct_valid_p)
506 HOOK_VECTOR_END (asm_out)
508 /* Functions relating to instruction scheduling. All of these
509 default to null pointers, which haifa-sched.c looks for and handles. */
511 #define HOOK_PREFIX "TARGET_SCHED_"
512 HOOK_VECTOR (TARGET_SCHED, sched)
514 /* Given the current cost, COST, of an insn, INSN, calculate and
515 return a new cost based on its relationship to DEP_INSN through
516 the dependence LINK. The default is to make no adjustment. */
520 int, (rtx insn, rtx link, rtx dep_insn, int cost), NULL)
522 /* Adjust the priority of an insn as you see fit. Returns the new priority. */
526 int, (rtx insn, int priority), NULL)
528 /* Function which returns the maximum number of insns that can be
529 scheduled in the same machine cycle. This must be constant
530 over an entire compilation. The default is 1. */
536 /* Calculate how much this insn affects how many more insns we
537 can emit this cycle. Default is they all cost the same. */
541 int, (FILE *file, int verbose, rtx insn, int more), NULL)
543 /* Initialize machine-dependent scheduling code. */
547 void, (FILE *file, int verbose, int max_ready), NULL)
549 /* Finalize machine-dependent scheduling code. */
553 void, (FILE *file, int verbose), NULL)
555 /* Initialize machine-dependent function wide scheduling code. */
559 void, (FILE *file, int verbose, int old_max_uid), NULL)
561 /* Finalize machine-dependent function wide scheduling code. */
565 void, (FILE *file, int verbose), NULL)
567 /* Reorder insns in a machine-dependent fashion, in two different
568 places. Default does nothing. */
572 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
577 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
579 /* The following member value is a pointer to a function called
580 after evaluation forward dependencies of insns in chain given
581 by two parameter values (head and tail correspondingly). */
583 (dependencies_evaluation_hook,
585 void, (rtx head, rtx tail), NULL)
587 /* The values of the following four members are pointers to functions
588 used to simplify the automaton descriptions. dfa_pre_cycle_insn and
589 dfa_post_cycle_insn give functions returning insns which are used to
590 change the pipeline hazard recognizer state when the new simulated
591 processor cycle correspondingly starts and finishes. The function
592 defined by init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are
593 used to initialize the corresponding insns. The default values of
594 the members result in not changing the automaton state when the
595 new simulated processor cycle correspondingly starts and finishes. */
598 (init_dfa_pre_cycle_insn,
608 (init_dfa_post_cycle_insn,
613 (dfa_post_cycle_insn,
617 /* The values of the following two members are pointers to
618 functions used to simplify the automaton descriptions.
619 dfa_pre_advance_cycle and dfa_post_advance_cycle are getting called
620 immediately before and after cycle is advanced. */
623 (dfa_pre_advance_cycle,
628 (dfa_post_advance_cycle,
632 /* The following member value is a pointer to a function returning value
633 which defines how many insns in queue `ready' will we try for
634 multi-pass scheduling. If the member value is nonzero and the
635 function returns positive value, the DFA based scheduler will make
636 multi-pass scheduling for the first cycle. In other words, we will
637 try to choose ready insn which permits to start maximum number of
638 insns on the same cycle. */
640 (first_cycle_multipass_dfa_lookahead,
644 /* The following member value is pointer to a function controlling
645 what insns from the ready insn queue will be considered for the
646 multipass insn scheduling. If the hook returns zero for insn
647 passed as the parameter, the insn will be not chosen to be issued. */
649 (first_cycle_multipass_dfa_lookahead_guard,
651 int, (rtx insn), NULL)
653 /* The following member value is pointer to a function called by
654 the insn scheduler before issuing insn passed as the third
655 parameter on given cycle. If the hook returns nonzero, the
656 insn is not issued on given processors cycle. Instead of that,
657 the processor cycle is advanced. If the value passed through
658 the last parameter is zero, the insn ready queue is not sorted
659 on the new cycle start as usually. The first parameter passes
660 file for debugging output. The second one passes the scheduler
661 verbose level of the debugging output. The forth and the fifth
662 parameter values are correspondingly processor cycle on which
663 the previous insn has been issued and the current processor cycle. */
667 int, (FILE *dump, int verbose, rtx insn, int last_clock,
668 int clock, int *sort_p),
671 /* The following member value is a pointer to a function called by the
672 insn scheduler. It should return true if there exists a dependence
673 which is considered costly by the target, between the insn
674 DEP_PRO (&_DEP), and the insn DEP_CON (&_DEP). The first parameter is
675 the dep that represents the dependence between the two insns. The
676 second argument is the cost of the dependence as estimated by
677 the scheduler. The last argument is the distance in cycles
678 between the already scheduled insn (first parameter) and the
679 second insn (second parameter). */
681 (is_costly_dependence,
683 bool, (struct _dep *_dep, int cost, int distance), NULL)
687 "Given the current cost, @var{cost}, of an insn, @var{insn}, calculate and\
688 return a new cost based on its relationship to @var{dep_insn} through the\
689 dependence of weakness @var{dw}. The default is to make no adjustment.",
690 int, (rtx insn, int dep_type1, rtx dep_insn, int cost, int dw), NULL)
692 /* The following member value is a pointer to a function called
693 by the insn scheduler. This hook is called to notify the backend
694 that new instructions were emitted. */
700 /* Next 5 functions are for multi-point scheduling. */
702 /* Allocate memory for scheduler context. */
704 (alloc_sched_context,
706 void *, (void), NULL)
708 /* Fills the context from the local machine scheduler context. */
712 void, (void *tc, bool clean_p), NULL)
714 /* Sets local machine scheduler context to a saved value. */
718 void, (void *tc), NULL)
720 /* Clears a scheduler context so it becomes like after init. */
722 (clear_sched_context,
724 void, (void *tc), NULL)
726 /* Frees the scheduler context. */
730 void, (void *tc), NULL)
732 /* The following member value is a pointer to a function called
733 by the insn scheduler.
734 The first parameter is an instruction, the second parameter is the type
735 of the requested speculation, and the third parameter is a pointer to the
736 speculative pattern of the corresponding type (set if return value == 1).
738 -1, if there is no pattern, that will satisfy the requested speculation type,
739 0, if current pattern satisfies the requested speculation type,
740 1, if pattern of the instruction should be changed to the newly
745 int, (rtx insn, int request, rtx *new_pat), NULL)
747 /* The following member value is a pointer to a function called
748 by the insn scheduler. It should return true if the check instruction
749 passed as the parameter needs a recovery block. */
753 bool, (int dep_status), NULL)
755 /* The following member value is a pointer to a function called
756 by the insn scheduler. It should return a pattern for the check
758 The first parameter is a speculative instruction, the second parameter
759 is the label of the corresponding recovery block (or null, if it is a
760 simple check). If the mutation of the check is requested (e.g. from
761 ld.c to chk.a), the third parameter is true - in this case the first
762 parameter is the previous check. */
766 rtx, (rtx insn, rtx label, int mutate_p), NULL)
768 /* The following member value is a pointer to a function controlling
769 what insns from the ready insn queue will be considered for the
770 multipass insn scheduling. If the hook returns zero for the insn
771 passed as the parameter, the insn will not be chosen to be
772 issued. This hook is used to discard speculative instructions,
773 that stand at the first position of the ready list. */
775 (first_cycle_multipass_dfa_lookahead_guard_spec,
777 bool, (const_rtx insn), NULL)
779 /* The following member value is a pointer to a function that provides
780 information about the speculation capabilities of the target.
781 The parameter is a pointer to spec_info variable. */
785 void, (struct spec_info_def *spec_info), NULL)
789 "Return speculation types of instruction @var{insn}.",
790 int, (rtx insn), NULL)
793 (get_insn_checked_ds,
794 "Return speculation types that are checked for instruction @var{insn}",
795 int, (rtx insn), NULL)
799 "Return bool if rtx scanning should just skip current layer and\
800 advance to the inner rtxes.",
801 bool, (const_rtx x), NULL)
803 /* The following member value is a pointer to a function that provides
804 information about the target resource-based lower bound which is
805 used by the swing modulo scheduler. The parameter is a pointer
810 int, (struct ddg *g), NULL)
812 /* The following member value is a function that initializes dispatch
813 schedling and adds instructions to dispatch window according to its
818 void, (rtx insn, int x),
821 /* The following member value is a a function that returns true is
822 dispatch schedling is supported in hardware and condition passed
823 as the second parameter is true. */
827 bool, (rtx insn, int x),
828 hook_bool_rtx_int_false)
830 HOOK_VECTOR_END (sched)
832 /* Functions relating to vectorization. */
834 #define HOOK_PREFIX "TARGET_VECTORIZE_"
835 HOOK_VECTOR (TARGET_VECTORIZE, vectorize)
837 /* The following member value is a pointer to a function called
838 by the vectorizer, and return the decl of the target builtin
841 (builtin_mask_for_load,
845 /* Returns a code for builtin that realizes vectorized version of
846 function, or NULL_TREE if not available. */
848 (builtin_vectorized_function,
850 tree, (tree fndecl, tree vec_type_out, tree vec_type_in),
851 default_builtin_vectorized_function)
853 /* Returns a function declaration for a builtin that realizes the
854 vector conversion, or NULL_TREE if not available. */
858 tree, (unsigned code, tree dest_type, tree src_type),
859 default_builtin_vectorized_conversion)
861 /* Target builtin that implements vector widening multiplication.
862 builtin_mul_widen_eve computes the element-by-element products
863 for the even elements, and builtin_mul_widen_odd computes the
864 element-by-element products for the odd elements. */
866 (builtin_mul_widen_even,
868 tree, (tree x), NULL)
871 (builtin_mul_widen_odd,
873 tree, (tree x), NULL)
875 /* Cost of different vector/scalar statements in vectorization cost
876 model. In case of misaligned vector loads and stores the cost depends
877 on the data type and misalignment value. */
879 (builtin_vectorization_cost,
881 int, (enum vect_cost_for_stmt type_of_cost, tree vectype, int misalign),
882 default_builtin_vectorization_cost)
884 /* Return true if vector alignment is reachable (by peeling N
885 iterations) for the given type. */
887 (vector_alignment_reachable,
889 bool, (const_tree type, bool is_packed),
890 default_builtin_vector_alignment_reachable)
892 /* Target builtin that implements vector permute. */
896 tree, (tree type, tree *mask_element_type), NULL)
898 /* Return true if a vector created for builtin_vec_perm is valid. */
900 (builtin_vec_perm_ok,
902 bool, (tree vec_type, tree mask),
903 hook_bool_tree_tree_true)
905 /* Return true if the target supports misaligned store/load of a
906 specific factor denoted in the third parameter. The last parameter
907 is true if the access is defined in a packed struct. */
909 (support_vector_misalignment,
912 (enum machine_mode mode, const_tree type, int misalignment, bool is_packed),
913 default_builtin_support_vector_misalignment)
915 /* Returns the preferred mode for SIMD operations for the specified
918 (preferred_simd_mode,
921 (enum machine_mode mode),
922 default_preferred_simd_mode)
924 /* Returns a mask of vector sizes to iterate over when auto-vectorizing
925 after processing the preferred one derived from preferred_simd_mode. */
927 (autovectorize_vector_sizes,
931 default_autovectorize_vector_sizes)
933 HOOK_VECTOR_END (vectorize)
936 #define HOOK_PREFIX "TARGET_"
938 /* The initial value of target_flags. */
940 (default_target_flags,
944 /* Allow target specific overriding of option settings after options have
945 been changed by an attribute or pragma or when it is reset at the
946 end of the code affected by an attribute or pragma. */
948 (override_options_after_change,
953 /* Handle target switch CODE (an OPT_* value). ARG is the argument
954 passed to the switch; it is NULL if no argument was. VALUE is the
955 value of ARG if CODE specifies a UInteger option, otherwise it is
956 1 if the positive form of the switch was used and 0 if the negative
957 form was. Return true if the switch was valid. */
961 bool, (size_t code, const char *arg, int value),
962 hook_bool_size_t_constcharptr_int_true)
964 /* ??? Documenting this hook requires a GFDL license grant. */
967 "Handle target-specific parts of specifying -Ofast.",
971 /* Display extra, target specific information in response to a
972 --target-help switch. */
979 (eh_return_filter_mode,
980 "Return machine mode for filter value.",
981 enum machine_mode, (void),
982 default_eh_return_filter_mode)
984 /* Return machine mode for libgcc expanded cmp instructions. */
986 (libgcc_cmp_return_mode,
988 enum machine_mode, (void),
989 default_libgcc_cmp_return_mode)
991 /* Return machine mode for libgcc expanded shift instructions. */
993 (libgcc_shift_count_mode,
995 enum machine_mode, (void),
996 default_libgcc_shift_count_mode)
998 /* Return machine mode to be used for _Unwind_Word type. */
1002 enum machine_mode, (void),
1003 default_unwind_word_mode)
1005 /* Given two decls, merge their attributes and return the result. */
1007 (merge_decl_attributes,
1009 tree, (tree olddecl, tree newdecl),
1010 merge_decl_attributes)
1012 /* Given two types, merge their attributes and return the result. */
1014 (merge_type_attributes,
1016 tree, (tree type1, tree type2),
1017 merge_type_attributes)
1019 /* Table of machine attributes and functions to handle them.
1024 const struct attribute_spec *, NULL)
1026 /* Return true iff attribute NAME expects a plain identifier as its first
1029 (attribute_takes_identifier_p,
1031 bool, (const_tree name),
1032 hook_bool_const_tree_false)
1034 /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
1035 one if they are compatible and two if they are nearly compatible
1036 (which causes a warning to be generated). */
1038 (comp_type_attributes,
1040 int, (const_tree type1, const_tree type2),
1041 hook_int_const_tree_const_tree_1)
1043 /* Assign default attributes to the newly defined TYPE. */
1045 (set_default_type_attributes,
1050 /* Insert attributes on the newly created DECL. */
1054 void, (tree node, tree *attr_ptr),
1055 hook_void_tree_treeptr)
1057 /* Return true if FNDECL (which has at least one machine attribute)
1058 can be inlined despite its machine attributes, false otherwise. */
1060 (function_attribute_inlinable_p,
1062 bool, (const_tree fndecl),
1063 hook_bool_const_tree_false)
1065 /* Return true if bitfields in RECORD_TYPE should follow the
1066 Microsoft Visual C++ bitfield layout rules. */
1068 (ms_bitfield_layout_p,
1070 bool, (const_tree record_type),
1071 hook_bool_const_tree_false)
1073 /* True if the target supports decimal floating point. */
1075 (decimal_float_supported_p,
1078 default_decimal_float_supported_p)
1080 /* True if the target supports fixed-point. */
1082 (fixed_point_supported_p,
1085 default_fixed_point_supported_p)
1087 /* Return true if anonymous bitfields affect structure alignment. */
1089 (align_anon_bitfield,
1092 hook_bool_void_false)
1094 /* Return true if volatile bitfields should use the narrowest type possible.
1095 Return false if they should use the container type. */
1097 (narrow_volatile_bitfield,
1100 hook_bool_void_false)
1102 /* Set up target-specific built-in functions. */
1109 /* Initialize (if INITIALIZE_P is true) and return the target-specific
1110 built-in function decl for CODE.
1111 Return NULL if that is not possible. Return error_mark_node if CODE
1112 is outside of the range of valid target builtin function codes. */
1116 tree, (unsigned code, bool initialize_p), NULL)
1118 /* Expand a target-specific builtin. */
1123 (tree exp, rtx target, rtx subtarget, enum machine_mode mode, int ignore),
1124 default_expand_builtin)
1126 /* Select a replacement for a target-specific builtin. This is done
1127 *before* regular type checking, and so allows the target to
1128 implement a crude form of function overloading. The result is a
1129 complete expression that implements the operation. PARAMS really
1130 has type VEC(tree,gc)*, but we don't want to include tree.h here. */
1132 (resolve_overloaded_builtin,
1134 tree, (unsigned int /*location_t*/ loc, tree fndecl, void *arglist), NULL)
1136 /* Fold a target-specific builtin. */
1140 tree, (tree fndecl, int n_args, tree *argp, bool ignore),
1141 hook_tree_tree_int_treep_bool_null)
1143 /* Returns a code for a target-specific builtin that implements
1144 reciprocal of the function, or NULL_TREE if not available. */
1146 (builtin_reciprocal,
1148 tree, (unsigned fn, bool md_fn, bool sqrt),
1149 default_builtin_reciprocal)
1151 /* For a vendor-specific TYPE, return a pointer to a statically-allocated
1152 string containing the C++ mangling for TYPE. In all other cases, return
1157 const char *, (const_tree type),
1158 hook_constcharptr_const_tree_null)
1160 /* Make any adjustments to libfunc names needed for this target. */
1167 /* Given a decl, a section name, and whether the decl initializer
1168 has relocs, choose attributes for the section. */
1169 /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */
1171 (section_type_flags,
1173 unsigned int, (tree decl, const char *name, int reloc),
1174 default_section_type_flags)
1176 /* True if new jumps cannot be created, to replace existing ones or
1177 not, at the current point in the compilation. */
1179 (cannot_modify_jumps_p,
1182 hook_bool_void_false)
1184 /* Return a register class for which branch target register
1185 optimizations should be applied. */
1187 (branch_target_register_class,
1189 reg_class_t, (void),
1190 default_branch_target_register_class)
1192 /* Return true if branch target register optimizations should include
1193 callee-saved registers that are not already live during the current
1194 function. AFTER_PE_GEN is true if prologues and epilogues have
1195 already been generated. */
1197 (branch_target_register_callee_saved,
1199 bool, (bool after_prologue_epilogue_gen),
1200 hook_bool_bool_false)
1202 /* Return true if the target supports conditional execution. */
1204 (have_conditional_execution,
1207 default_have_conditional_execution)
1209 /* Return a new value for loop unroll size. */
1211 (loop_unroll_adjust,
1213 unsigned, (unsigned nunroll, struct loop *loop),
1216 /* True if the constant X cannot be placed in the constant pool. */
1218 (cannot_force_const_mem,
1221 hook_bool_rtx_false)
1224 (cannot_copy_insn_p,
1225 "True if the insn @var{x} cannot be duplicated.",
1228 /* True if X is considered to be commutative. */
1232 bool, (const_rtx x, int outer_code),
1233 hook_bool_const_rtx_commutative_p)
1235 /* True if ADDR is an address-expression whose effect depends
1236 on the mode of the memory reference it is used in. */
1238 (mode_dependent_address_p,
1240 bool, (const_rtx addr),
1241 default_mode_dependent_address_p)
1243 /* Given an invalid address X for a given machine mode, try machine-specific
1244 ways to make it legitimate. Return X or an invalid address on failure. */
1246 (legitimize_address,
1248 rtx, (rtx x, rtx oldx, enum machine_mode mode),
1249 default_legitimize_address)
1251 /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */
1253 (delegitimize_address,
1256 delegitimize_mem_from_attrs)
1258 /* Given an address RTX, say whether it is valid. */
1260 (legitimate_address_p,
1262 bool, (enum machine_mode mode, rtx x, bool strict),
1263 default_legitimate_address_p)
1265 /* True if the given constant can be put into an object_block. */
1267 (use_blocks_for_constant_p,
1269 bool, (enum machine_mode mode, const_rtx x),
1270 hook_bool_mode_const_rtx_false)
1272 /* The minimum and maximum byte offsets for anchored addresses. */
1283 /* True if section anchors can be used to access the given symbol. */
1285 (use_anchors_for_symbol_p,
1287 bool, (const_rtx x),
1288 default_use_anchors_for_symbol_p)
1290 /* True if it is OK to do sibling call optimization for the specified
1291 call expression EXP. DECL will be the called function, or NULL if
1292 this is an indirect call. */
1294 (function_ok_for_sibcall,
1296 bool, (tree decl, tree exp),
1297 hook_bool_tree_tree_false)
1299 /* Establish appropriate back-end context for processing the function
1300 FNDECL. The argument might be NULL to indicate processing at top
1301 level, outside of any function scope. */
1303 (set_current_function,
1305 void, (tree decl), hook_void_tree)
1307 /* True if EXP should be placed in a "small data" section. */
1311 bool, (const_tree exp),
1312 hook_bool_const_tree_false)
1314 /* True if EXP names an object for which name resolution must resolve
1315 to the current executable or shared library. */
1319 bool, (const_tree exp),
1320 default_binds_local_p)
1322 /* Check if profiling code is before or after prologue. */
1324 (profile_before_prologue,
1325 "It returns true if target wants profile code emitted before prologue.\n\n\
1326 The default version of this hook use the target macro\n\
1327 @code{PROFILE_BEFORE_PROLOGUE}.",
1329 default_profile_before_prologue)
1331 /* Modify and return the identifier of a DECL's external name,
1332 originally identified by ID, as required by the target,
1333 (eg, append @nn to windows32 stdcall function names).
1334 The default is to return ID without modification. */
1336 (mangle_decl_assembler_name,
1338 tree, (tree decl, tree id),
1339 default_mangle_decl_assembler_name)
1341 /* Do something target-specific to record properties of the DECL into
1342 the associated SYMBOL_REF. */
1344 (encode_section_info,
1346 void, (tree decl, rtx rtl, int new_decl_p),
1347 default_encode_section_info)
1349 /* Undo the effects of encode_section_info on the symbol string. */
1351 (strip_name_encoding,
1353 const char *, (const char *name),
1354 default_strip_name_encoding)
1356 /* If shift optabs for MODE are known to always truncate the shift count,
1357 return the mask that they apply. Return 0 otherwise. */
1359 (shift_truncation_mask,
1361 unsigned HOST_WIDE_INT, (enum machine_mode mode),
1362 default_shift_truncation_mask)
1364 /* Return the number of divisions in the given MODE that should be present,
1365 so that it is profitable to turn the division into a multiplication by
1368 (min_divisions_for_recip_mul,
1370 unsigned int, (enum machine_mode mode),
1371 default_min_divisions_for_recip_mul)
1373 /* If the representation of integral MODE is such that values are
1374 always sign-extended to a wider mode MODE_REP then return
1375 SIGN_EXTEND. Return UNKNOWN otherwise. */
1376 /* Note that the return type ought to be RTX_CODE, but that's not
1377 necessarily defined at this point. */
1381 int, (enum machine_mode mode, enum machine_mode rep_mode),
1382 default_mode_rep_extended)
1384 /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */
1386 (valid_pointer_mode,
1388 bool, (enum machine_mode mode),
1389 default_valid_pointer_mode)
1391 /* Support for named address spaces. */
1393 #define HOOK_PREFIX "TARGET_ADDR_SPACE_"
1394 HOOK_VECTOR (TARGET_ADDR_SPACE_HOOKS, addr_space)
1396 /* MODE to use for a pointer into another address space. */
1400 enum machine_mode, (addr_space_t address_space),
1401 default_addr_space_pointer_mode)
1403 /* MODE to use for an address in another address space. */
1407 enum machine_mode, (addr_space_t address_space),
1408 default_addr_space_address_mode)
1410 /* True if MODE is valid for a pointer in __attribute__((mode("MODE")))
1411 in another address space. */
1413 (valid_pointer_mode,
1415 bool, (enum machine_mode mode, addr_space_t as),
1416 default_addr_space_valid_pointer_mode)
1418 /* True if an address is a valid memory address to a given named address
1419 space for a given mode. */
1421 (legitimate_address_p,
1423 bool, (enum machine_mode mode, rtx exp, bool strict, addr_space_t as),
1424 default_addr_space_legitimate_address_p)
1426 /* Return an updated address to convert an invalid pointer to a named
1427 address space to a valid one. If NULL_RTX is returned use machine
1428 independent methods to make the address valid. */
1430 (legitimize_address,
1432 rtx, (rtx x, rtx oldx, enum machine_mode mode, addr_space_t as),
1433 default_addr_space_legitimize_address)
1435 /* True if one named address space is a subset of another named address. */
1439 bool, (addr_space_t superset, addr_space_t subset),
1440 default_addr_space_subset_p)
1442 /* Function to convert an rtl expression from one address space to another. */
1446 rtx, (rtx op, tree from_type, tree to_type),
1447 default_addr_space_convert)
1449 HOOK_VECTOR_END (addr_space)
1452 #define HOOK_PREFIX "TARGET_"
1454 /* True if MODE is valid for the target. By "valid", we mean able to
1455 be manipulated in non-trivial ways. In particular, this means all
1456 the arithmetic is supported. */
1458 (scalar_mode_supported_p,
1460 bool, (enum machine_mode mode),
1461 default_scalar_mode_supported_p)
1463 /* Similarly for vector modes. "Supported" here is less strict. At
1464 least some operations are supported; need to check optabs or builtins
1465 for further details. */
1467 (vector_mode_supported_p,
1469 bool, (enum machine_mode mode),
1470 hook_bool_mode_false)
1472 /* Compute cost of moving data from a register of class FROM to one of
1475 (register_move_cost,
1477 int, (enum machine_mode mode, reg_class_t from, reg_class_t to),
1478 default_register_move_cost)
1480 /* Compute cost of moving registers to/from memory. */
1481 /* ??? Documenting the argument types for this hook requires a GFDL
1482 license grant. Also, the documentation uses a different name for RCLASS. */
1486 int, (enum machine_mode mode, reg_class_t rclass, bool in),
1487 default_memory_move_cost)
1489 /* True for MODE if the target expects that registers in this mode will
1490 be allocated to registers in a small register class. The compiler is
1491 allowed to use registers explicitly used in the rtl as spill registers
1492 but it should prevent extending the lifetime of these registers. */
1494 (small_register_classes_for_mode_p,
1496 bool, (enum machine_mode mode),
1497 hook_bool_mode_false)
1499 /* Compute a (partial) cost for rtx X. Return true if the complete
1500 cost has been computed, and false if subexpressions should be
1501 scanned. In either case, *TOTAL contains the cost result. */
1502 /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's
1503 not necessarily defined at this point. */
1507 bool, (rtx x, int code, int outer_code, int *total, bool speed),
1508 hook_bool_rtx_int_int_intp_bool_false)
1510 /* Compute the cost of X, used as an address. Never called with
1511 invalid addresses. */
1515 int, (rtx address, bool speed),
1516 default_address_cost)
1518 /* Return where to allocate pseudo for a given hard register initial value. */
1520 (allocate_initial_value,
1522 rtx, (rtx hard_reg), NULL)
1524 /* Return nonzero if evaluating UNSPEC[_VOLATILE] X might cause a trap.
1525 FLAGS has the same meaning as in rtlanal.c: may_trap_p_1. */
1529 int, (const_rtx x, unsigned flags),
1530 default_unspec_may_trap_p)
1532 /* Given a register, this hook should return a parallel of registers
1533 to represent where to find the register pieces. Define this hook
1534 if the register and its mode are represented in Dwarf in
1535 non-contiguous locations, or if the register should be
1536 represented in more than one register in Dwarf. Otherwise, this
1537 hook should return NULL_RTX. */
1539 (dwarf_register_span,
1544 /* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
1545 entries not corresponding directly to registers below
1546 FIRST_PSEUDO_REGISTER, this hook should generate the necessary
1547 code, given the address of the table. */
1549 (init_dwarf_reg_sizes_extra,
1551 void, (tree address),
1554 /* Fetch the fixed register(s) which hold condition codes, for
1555 targets where it makes sense to look for duplicate assignments to
1556 the condition codes. This should return true if there is such a
1557 register, false otherwise. The arguments should be set to the
1558 fixed register numbers. Up to two condition code registers are
1559 supported. If there is only one for this target, the int pointed
1560 at by the second argument should be set to -1. */
1562 (fixed_condition_code_regs,
1564 bool, (unsigned int *p1, unsigned int *p2),
1565 hook_bool_uintp_uintp_false)
1567 /* If two condition code modes are compatible, return a condition
1568 code mode which is compatible with both, such that a comparison
1569 done in the returned mode will work for both of the original
1570 modes. If the condition code modes are not compatible, return
1573 (cc_modes_compatible,
1575 enum machine_mode, (enum machine_mode m1, enum machine_mode m2),
1576 default_cc_modes_compatible)
1578 /* Do machine-dependent code transformations. Called just before
1579 delayed-branch scheduling. */
1581 (machine_dependent_reorg,
1585 /* Create the __builtin_va_list type. */
1587 (build_builtin_va_list,
1590 std_build_builtin_va_list)
1592 /* Enumerate the va list variants. */
1596 int, (int idx, const char **pname, tree *ptree),
1599 /* Get the cfun/fndecl calling abi __builtin_va_list type. */
1603 tree, (tree fndecl),
1606 /* Get the __builtin_va_list type dependent on input type. */
1608 (canonical_va_list_type,
1611 std_canonical_va_list_type)
1613 /* ??? Documenting this hook requires a GFDL license grant. */
1615 (expand_builtin_va_start,
1616 "Expand the @code{__builtin_va_start} builtin.",
1617 void, (tree valist, rtx nextarg), NULL)
1619 /* Gimplifies a VA_ARG_EXPR. */
1621 (gimplify_va_arg_expr,
1623 tree, (tree valist, tree type, gimple_seq *pre_p, gimple_seq *post_p),
1624 std_gimplify_va_arg_expr)
1626 /* Validity-checking routines for PCH files, target-specific.
1627 get_pch_validity returns a pointer to the data to be stored,
1628 and stores the size in its argument. pch_valid_p gets the same
1629 information back and returns NULL if the PCH is valid,
1630 or an error message if not. */
1634 void *, (size_t *sz),
1635 default_get_pch_validity)
1640 const char *, (const void *data, size_t sz),
1641 default_pch_valid_p)
1643 /* If nonnull, this function checks whether a PCH file with the
1644 given set of target flags can be used. It returns NULL if so,
1645 otherwise it returns an error message. */
1647 (check_pch_target_flags,
1649 const char *, (int pch_flags), NULL)
1651 /* True if the compiler should give an enum type only as many
1652 bytes as it takes to represent the range of possible values of
1655 (default_short_enums,
1658 hook_bool_void_false)
1660 /* This target hook returns an rtx that is used to store the address
1661 of the current frame into the built-in setjmp buffer. */
1663 (builtin_setjmp_frame_value,
1666 default_builtin_setjmp_frame_value)
1668 /* This target hook should add STRING_CST trees for any hard regs
1669 the port wishes to automatically clobber for an asm. */
1673 tree, (tree outputs, tree inputs, tree clobbers),
1674 hook_tree_tree_tree_tree_3rd_identity)
1676 /* This target hook allows the backend to specify a calling convention
1677 in the debug information. This function actually returns an
1678 enum dwarf_calling_convention, but because of forward declarations
1679 and not wanting to include dwarf2.h everywhere target.h is included
1680 the function is being declared as an int. */
1682 (dwarf_calling_convention,
1684 int, (const_tree function),
1685 hook_int_const_tree_0)
1687 /* This target hook allows the backend to emit frame-related insns that
1688 contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info
1689 engine will invoke it on insns of the form
1690 (set (reg) (unspec [...] UNSPEC_INDEX))
1692 (set (reg) (unspec_volatile [...] UNSPECV_INDEX))
1693 to let the backend emit the call frame instructions. */
1695 (dwarf_handle_frame_unspec,
1697 void, (const char *label, rtx pattern, int index), NULL)
1699 /* ??? Documenting this hook requires a GFDL license grant. */
1701 (stdarg_optimize_hook,
1702 "Perform architecture specific checking of statements gimplified\
1703 from @code{VA_ARG_EXPR}. @var{stmt} is the statement. Returns true if\
1704 the statement doesn't need to be checked for @code{va_list} references.",
1705 bool, (struct stdarg_info *ai, const_gimple stmt), NULL)
1707 /* This target hook allows the operating system to override the DECL
1708 that represents the external variable that contains the stack
1709 protection guard variable. The type of this DECL is ptr_type_node. */
1711 (stack_protect_guard,
1714 default_stack_protect_guard)
1716 /* This target hook allows the operating system to override the CALL_EXPR
1717 that is invoked when a check vs the guard variable fails. */
1719 (stack_protect_fail,
1722 default_external_stack_protect_fail)
1725 (supports_split_stack,
1726 "Whether this target supports splitting the stack. This is called\
1727 after options have been parsed, so the target may reject splitting\
1728 the stack in some configurations. The default version of this hook\
1729 returns false. If @var{report} is true, this function may issue a warning\
1730 or error; if @var{report} is false, it must simply return a value",
1732 hook_bool_bool_false)
1734 /* Returns NULL if target supports the insn within a doloop block,
1735 otherwise it returns an error message. */
1737 (invalid_within_doloop,
1739 const char *, (const_rtx insn),
1740 default_invalid_within_doloop)
1743 (valid_dllimport_attribute_p,
1744 "@var{decl} is a variable or function with @code{__attribute__((dllimport))}\
1745 specified. Use this hook if the target needs to add extra validation\
1746 checks to @code{handle_dll_attribute}.",
1747 bool, (const_tree decl),
1748 hook_bool_const_tree_true)
1750 /* If non-zero, align constant anchors in CSE to a multiple of this
1755 unsigned HOST_WIDE_INT, 0)
1757 /* Functions relating to calls - argument passing, returns, etc. */
1758 /* Members of struct call have no special macro prefix. */
1759 HOOK_VECTOR (TARGET_CALLS, calls)
1762 (promote_function_mode,
1764 enum machine_mode, (const_tree type, enum machine_mode mode, int *punsignedp,
1765 const_tree funtype, int for_return),
1766 default_promote_function_mode)
1769 (promote_prototypes,
1771 bool, (const_tree fntype),
1772 hook_bool_const_tree_false)
1777 rtx, (tree fndecl, int incoming),
1778 hook_rtx_tree_int_null)
1782 bool, (const_tree type, const_tree fntype),
1783 default_return_in_memory)
1788 bool, (const_tree type),
1789 hook_bool_const_tree_false)
1791 /* Return true if a parameter must be passed by reference. TYPE may
1792 be null if this is a libcall. CA may be null if this query is
1793 from __builtin_va_arg. */
1798 (CUMULATIVE_ARGS *cum, enum machine_mode mode, const_tree type, bool named),
1799 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
1802 (expand_builtin_saveregs,
1805 default_expand_builtin_saveregs)
1807 /* Returns pretend_argument_size. */
1809 (setup_incoming_varargs,
1811 void, (CUMULATIVE_ARGS *args_so_far, enum machine_mode mode, tree type,
1812 int *pretend_args_size, int second_time),
1813 default_setup_incoming_varargs)
1816 (strict_argument_naming,
1818 bool, (CUMULATIVE_ARGS *ca),
1819 hook_bool_CUMULATIVE_ARGS_false)
1821 /* Returns true if we should use
1822 targetm.calls.setup_incoming_varargs() and/or
1823 targetm.calls.strict_argument_naming(). */
1825 (pretend_outgoing_varargs_named,
1827 bool, (CUMULATIVE_ARGS *ca),
1828 default_pretend_outgoing_varargs_named)
1830 /* Given a complex type T, return true if a parameter of type T
1831 should be passed as two scalars. */
1835 bool, (const_tree type), NULL)
1837 /* Return true if type T, mode MODE, may not be passed in registers,
1838 but must be passed on the stack. */
1839 /* ??? This predicate should be applied strictly after pass-by-reference.
1840 Need audit to verify that this is the case. */
1842 (must_pass_in_stack,
1844 bool, (enum machine_mode mode, const_tree type),
1845 must_pass_in_stack_var_size_or_pad)
1847 /* Return true if type TYPE, mode MODE, which is passed by reference,
1848 should have the object copy generated by the callee rather than
1849 the caller. It is never called for TYPE requiring constructors. */
1854 (CUMULATIVE_ARGS *cum, enum machine_mode mode, const_tree type, bool named),
1855 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
1857 /* Return zero for arguments passed entirely on the stack or entirely
1858 in registers. If passed in both, return the number of bytes passed
1859 in registers; the balance is therefore passed on the stack. */
1863 int, (CUMULATIVE_ARGS *cum, enum machine_mode mode, tree type, bool named),
1864 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0)
1866 /* Update the state in CA to advance past an argument in the
1867 argument list. The values MODE, TYPE, and NAMED describe that
1869 /* ??? tm.texi still only describes the old macro. */
1871 (function_arg_advance,
1874 (CUMULATIVE_ARGS *ca, enum machine_mode mode, const_tree type, bool named),
1875 default_function_arg_advance)
1877 /* Return zero if the argument described by the state of CA should
1878 be placed on a stack, or a hard register in which to store the
1879 argument. The values MODE, TYPE, and NAMED describe that
1881 /* ??? tm.texi still only describes the old macro. */
1885 rtx, (CUMULATIVE_ARGS *ca, enum machine_mode mode, const_tree type,
1887 default_function_arg)
1889 /* Likewise, but for machines with register windows. Return the
1890 location where the argument will appear to the callee. */
1891 /* ??? tm.texi still only describes the old macro. */
1893 (function_incoming_arg,
1895 rtx, (CUMULATIVE_ARGS *ca, enum machine_mode mode, const_tree type,
1897 default_function_incoming_arg)
1899 /* Return the diagnostic message string if function without a prototype
1900 is not allowed for this 'val' argument; NULL otherwise. */
1902 (invalid_arg_for_unprototyped_fn,
1904 const char *, (const_tree typelist, const_tree funcdecl, const_tree val),
1905 hook_invalid_arg_for_unprototyped_fn)
1907 /* Return an rtx for the return value location of the function
1908 specified by FN_DECL_OR_TYPE with a return type of RET_TYPE. */
1912 rtx, (const_tree ret_type, const_tree fn_decl_or_type, bool outgoing),
1913 default_function_value)
1915 /* Return the rtx for the result of a libcall of mode MODE,
1916 calling the function FN_NAME. */
1920 rtx, (enum machine_mode mode, const_rtx fun),
1921 default_libcall_value)
1923 /* Return true if REGNO is a possible register number for
1924 a function value as seen by the caller. */
1926 (function_value_regno_p,
1928 bool, (const unsigned int regno),
1929 default_function_value_regno_p)
1931 /* ??? Documenting this hook requires a GFDL license grant. */
1933 (internal_arg_pointer,
1934 "Return an rtx for the argument pointer incoming to the\
1937 default_internal_arg_pointer)
1939 /* Update the current function stack boundary if needed. */
1941 (update_stack_boundary,
1945 /* Handle stack alignment and return an rtx for Dynamic Realign
1946 Argument Pointer if necessary. */
1952 /* Return true if all function parameters should be spilled to the
1955 (allocate_stack_slots_for_args,
1958 hook_bool_void_true)
1960 /* Return an rtx for the static chain for FNDECL. If INCOMING_P is true,
1961 then it should be for the callee; otherwise for the caller. */
1965 rtx, (const_tree fndecl, bool incoming_p),
1966 default_static_chain)
1968 /* Fill in the trampoline at MEM with a call to FNDECL and a
1969 static chain value of CHAIN. */
1973 void, (rtx m_tramp, tree fndecl, rtx static_chain),
1974 default_trampoline_init)
1976 /* Adjust the address of the trampoline in a target-specific way. */
1978 (trampoline_adjust_address,
1980 rtx, (rtx addr), NULL)
1982 /* Return the number of bytes of its own arguments that a function
1983 pops on returning, or 0 if the function pops no arguments and the
1984 caller must therefore pop them all after the function returns. */
1985 /* ??? tm.texi has no types for the parameters. */
1989 int, (tree fundecl, tree funtype, int size),
1990 default_return_pops_args)
1992 HOOK_VECTOR_END (calls)
1994 /* Return the diagnostic message string if conversion from FROMTYPE
1995 to TOTYPE is not allowed, NULL otherwise. */
1997 (invalid_conversion,
1999 const char *, (const_tree fromtype, const_tree totype),
2000 hook_constcharptr_const_tree_const_tree_null)
2002 /* Return the diagnostic message string if the unary operation OP is
2003 not permitted on TYPE, NULL otherwise. */
2007 const char *, (int op, const_tree type),
2008 hook_constcharptr_int_const_tree_null)
2010 /* Return the diagnostic message string if the binary operation OP
2011 is not permitted on TYPE1 and TYPE2, NULL otherwise. */
2015 const char *, (int op, const_tree type1, const_tree type2),
2016 hook_constcharptr_int_const_tree_const_tree_null)
2018 /* Return the diagnostic message string if TYPE is not valid as a
2019 function parameter type, NULL otherwise. */
2021 (invalid_parameter_type,
2023 const char *, (const_tree type),
2024 hook_constcharptr_const_tree_null)
2026 /* Return the diagnostic message string if TYPE is not valid as a
2027 function return type, NULL otherwise. */
2029 (invalid_return_type,
2031 const char *, (const_tree type),
2032 hook_constcharptr_const_tree_null)
2034 /* If values of TYPE are promoted to some other type when used in
2035 expressions (analogous to the integer promotions), return that type,
2036 or NULL_TREE otherwise. */
2040 tree, (const_tree type),
2041 hook_tree_const_tree_null)
2043 /* Convert EXPR to TYPE, if target-specific types with special conversion
2044 rules are involved. Return the converted expression, or NULL to apply
2045 the standard conversion rules. */
2049 tree, (tree type, tree expr),
2050 hook_tree_tree_tree_null)
2052 /* Return the array of IRA cover classes for the current target. */
2056 const reg_class_t *, (void),
2057 default_ira_cover_classes)
2059 /* Return the class for a secondary reload, and fill in extra information. */
2064 (bool in_p, rtx x, reg_class_t reload_class, enum machine_mode reload_mode,
2065 secondary_reload_info *sri),
2066 default_secondary_reload)
2068 /* Given an rtx X being reloaded into a reg required to be in class CLASS,
2069 return the class of reg to actually use. */
2071 (preferred_reload_class,
2074 (rtx x, reg_class_t rclass),
2075 default_preferred_reload_class)
2077 /* Like TARGET_PREFERRED_RELOAD_CLASS, but for output reloads instead of
2080 (preferred_output_reload_class,
2083 (rtx x, reg_class_t rclass),
2084 default_preferred_output_reload_class)
2087 (class_likely_spilled_p,
2089 bool, (reg_class_t rclass),
2090 default_class_likely_spilled_p)
2092 /* This target hook allows the backend to perform additional
2093 processing while initializing for variable expansion. */
2095 (expand_to_rtl_hook,
2100 /* This target hook allows the backend to perform additional
2101 instantiations on rtx that are not actually in insns yet,
2102 but will be later. */
2109 /* Return true if is OK to use a hard register REGNO as scratch register
2112 (hard_regno_scratch_ok,
2114 bool, (unsigned int regno),
2115 default_hard_regno_scratch_ok)
2117 /* Return the smallest number of different values for which it is best to
2118 use a jump-table instead of a tree of conditional branches. */
2120 (case_values_threshold,
2122 unsigned int, (void),
2123 default_case_values_threshold)
2125 /* Retutn true if a function must have and use a frame pointer. */
2127 (frame_pointer_required,
2130 hook_bool_void_false)
2132 /* Returns true if the compiler is allowed to try to replace register number
2133 from-reg with register number to-reg. */
2137 bool, (const int from_reg, const int to_reg),
2138 hook_bool_const_int_const_int_true)
2140 /* Functions specific to the C family of frontends. */
2142 #define HOOK_PREFIX "TARGET_C_"
2143 HOOK_VECTOR (TARGET_C, c)
2145 /* ??? Documenting this hook requires a GFDL license grant. */
2148 "Return machine mode for non-standard constant literal suffix @var{c},\
2149 or VOIDmode if non-standard suffixes are unsupported.",
2150 enum machine_mode, (char c),
2151 default_mode_for_suffix)
2155 /* Functions specific to the C++ frontend. */
2157 #define HOOK_PREFIX "TARGET_CXX_"
2158 HOOK_VECTOR (TARGET_CXX, cxx)
2160 /* Return the integer type used for guard variables. */
2165 default_cxx_guard_type)
2167 /* Return true if only the low bit of the guard should be tested. */
2172 hook_bool_void_false)
2174 /* Returns the size of the array cookie for an array of type. */
2179 default_cxx_get_cookie_size)
2181 /* Returns true if the element size should be stored in the array cookie. */
2186 hook_bool_void_false)
2188 /* Allows backends to perform additional processing when
2189 deciding if a class should be exported or imported. */
2191 (import_export_class,
2193 int, (tree type, int import_export), NULL)
2195 /* Returns true if constructors and destructors return "this". */
2197 (cdtor_returns_this,
2200 hook_bool_void_false)
2202 /* Returns true if the key method for a class can be an inline
2203 function, so long as it is not declared inline in the class
2204 itself. Returning true is the behavior required by the Itanium C++ ABI. */
2206 (key_method_may_be_inline,
2209 hook_bool_void_true)
2212 (determine_class_data_visibility,
2213 "@var{decl} is a virtual table, virtual table table, typeinfo object,\
2214 or other similar implicit class data object that will be emitted with\
2215 external linkage in this translation unit. No ELF visibility has been\
2216 explicitly specified. If the target needs to specify a visibility\
2217 other than that of the containing class, use this hook to set\
2218 @code{DECL_VISIBILITY} and @code{DECL_VISIBILITY_SPECIFIED}.",
2222 /* Returns true (the default) if virtual tables and other
2223 similar implicit class data objects are always COMDAT if they
2224 have external linkage. If this hook returns false, then
2225 class data for classes whose virtual table will be emitted in
2226 only one translation unit will not be COMDAT. */
2228 (class_data_always_comdat,
2231 hook_bool_void_true)
2233 /* Returns true (the default) if the RTTI for the basic types,
2234 which is always defined in the C++ runtime, should be COMDAT;
2235 false if it should not be COMDAT. */
2237 (library_rtti_comdat,
2240 hook_bool_void_true)
2242 /* Returns true if __aeabi_atexit should be used to register static
2248 hook_bool_void_false)
2250 /* Returns true if target may use atexit in the same manner as
2251 __cxa_atexit to register static destructors. */
2253 (use_atexit_for_cxa_atexit,
2256 hook_bool_void_false)
2259 (adjust_class_at_definition,
2260 "@var{type} is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that has just\
2261 been defined. Use this hook to make adjustments to the class (eg, tweak\
2262 visibility or perform any other required target modifications).",
2266 HOOK_VECTOR_END (cxx)
2268 /* Functions and data for emulated TLS support. */
2270 #define HOOK_PREFIX "TARGET_EMUTLS_"
2271 HOOK_VECTOR (TARGET_EMUTLS, emutls)
2273 /* Name of the address and common functions. */
2277 const char *, "__builtin___emutls_get_address")
2282 const char *, "__builtin___emutls_register_common")
2284 /* Prefixes for proxy variable and template. */
2295 /* Prefixes for proxy variable and template. */
2306 /* Function to generate field definitions of the proxy variable. */
2310 tree, (tree type, tree *name),
2311 default_emutls_var_fields)
2313 /* Function to initialize a proxy variable. */
2317 tree, (tree var, tree decl, tree tmpl_addr),
2318 default_emutls_var_init)
2320 /* Whether we are allowed to alter the usual alignment of the
2327 /* Whether we can emit debug information for TLS vars. */
2329 (debug_form_tls_address,
2333 HOOK_VECTOR_END (emutls)
2336 #define HOOK_PREFIX "TARGET_OPTION_"
2337 HOOK_VECTOR (TARGET_OPTION_HOOKS, target_option_hooks)
2339 /* Function to validate the attribute((option(...))) strings or NULL. If
2340 the option is validated, it is assumed that DECL_FUNCTION_SPECIFIC will
2341 be filled in in the function decl node. */
2345 bool, (tree fndecl, tree name, tree args, int flags),
2346 default_target_option_valid_attribute_p)
2348 /* Function to save any extra target state in the target options structure. */
2352 void, (struct cl_target_option *ptr), NULL)
2354 /* Function to restore any extra target state from the target options
2359 void, (struct cl_target_option *ptr), NULL)
2361 /* Function to print any extra target state from the target options
2366 void, (FILE *file, int indent, struct cl_target_option *ptr), NULL)
2368 /* Function to parse arguments to be validated for #pragma option, and to
2369 change the state if the options are valid. If the first argument is
2370 NULL, the second argument specifies the default options to use. Return
2371 true if the options are valid, and set the current state. */
2372 /* ??? The documentation in tm.texi is incomplete. */
2376 bool, (tree args, tree pop_target),
2377 default_target_option_pragma_parse)
2379 /* Do option overrides for the target. */
2386 /* Set default optimizations for the target. */
2390 void, (int level, int size),
2395 "Set target-dependent default values for @option{--param} settings, using\
2396 calls to @code{set_default_param_value}.",
2402 "Set target-dependent initial values of fields in @var{opts}.",
2403 void, (struct gcc_options *opts),
2404 hook_void_gcc_optionsp)
2406 /* Function to determine if one function can inline another function. */
2408 #define HOOK_PREFIX "TARGET_"
2412 bool, (tree caller, tree callee),
2413 default_target_can_inline_p)
2415 HOOK_VECTOR_END (target_option)
2417 /* For targets that need to mark extra registers as live on entry to
2418 the function, they should define this target hook and set their
2419 bits in the bitmap passed in. */
2421 (extra_live_on_entry,
2423 void, (bitmap regs),
2426 /* Determine the type of unwind info to emit for debugging. */
2430 enum unwind_info_type, (void),
2431 default_debug_unwind_info)
2433 /* Determine the type of unwind info to emit for exceptions. */
2435 (except_unwind_info,
2437 enum unwind_info_type, (void),
2438 default_except_unwind_info)
2440 /* Leave the boolean fields at the end. */
2442 /* True if unwinding tables should be generated by default. */
2444 (unwind_tables_default,
2448 /* True if arbitrary sections are supported. */
2450 (have_named_sections,
2454 /* True if we can create zeroed data by switching to a BSS section
2455 and then using ASM_OUTPUT_SKIP to allocate the space. */
2457 (have_switchable_bss_sections,
2461 /* True if "native" constructors and destructors are supported,
2462 false if we're using collect2 for the job. */
2468 /* True if thread-local storage is supported. */
2474 /* True if a small readonly data section is supported. */
2476 (have_srodata_section,
2480 /* True if EH frame info sections should be zero-terminated. */
2482 (terminate_dw2_eh_frame_info,
2486 /* True if #NO_APP should be emitted at the beginning of assembly output. */
2488 (asm_file_start_app_off,
2492 /* True if output_file_directive should be called for main_input_filename
2493 at the beginning of assembly output. */
2495 (asm_file_start_file_directive,
2500 (handle_pragma_extern_prefix,
2501 "True if @code{#pragma extern_prefix} is to be supported.",
2504 /* True if the target is allowed to reorder memory accesses unless
2505 synchronization is explicitly requested. */
2511 /* Returns true if we should generate exception tables for use with the
2512 ARM EABI. The effects the encoding of function exception specifications. */
2519 (want_debug_pub_sections,
2520 "True if the @code{.debug_pubtypes} and @code{.debug_pubnames} sections\
2521 should be emitted. These sections are not used on most platforms, and\
2522 in particular GDB does not use them.",
2525 /* Leave the boolean fields at the end. */
2527 /* Empty macro arguments are undefined in C90, so use an empty macro. */
2528 #define C90_EMPTY_HACK
2529 /* Close the 'struct gcc_target' definition. */
2530 HOOK_VECTOR_END (C90_EMPTY_HACK)
2532 HOOK_VECTOR (TARGETCM_INITIALIZER, gcc_targetcm)
2534 /* Handle target switch CODE (an OPT_* value). ARG is the argument
2535 passed to the switch; it is NULL if no argument was. VALUE is the
2536 value of ARG if CODE specifies a UInteger option, otherwise it is
2537 1 if the positive form of the switch was used and 0 if the negative
2538 form was. Return true if the switch was valid. */
2542 bool, (size_t code, const char *arg, int value),
2543 default_handle_c_option)
2545 HOOK_VECTOR_END (C90_EMPTY_HACK)