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 /* Try to output the assembler code for an integer object whose
105 value is given by X. SIZE is the size of the object in bytes and
106 ALIGNED_P indicates whether it is aligned. Return true if
107 successful. Only handles cases for which BYTE_OP, ALIGNED_OP
108 and UNALIGNED_OP are NULL. */
112 /* Only handles cases for which BYTE_OP, ALIGNED_OP and UNALIGNED_OP are
114 bool, (rtx x, unsigned int size, int aligned_p),
115 default_assemble_integer)
117 /* Output code that will globalize a label. */
121 void, (FILE *stream, const char *name),
122 default_globalize_label)
124 /* Output code that will globalize a declaration. */
126 (globalize_decl_name,
128 void, (FILE *stream, tree decl), default_globalize_decl_name)
130 /* Output code that will emit a label for unwind info, if this
131 target requires such labels. Second argument is the decl the
132 unwind info is associated with, third is a boolean: true if
133 this is for exception handling, fourth is a boolean: true if
134 this is only a placeholder for an omitted FDE. */
138 void, (FILE *stream, tree decl, int for_eh, int empty),
139 default_emit_unwind_label)
141 /* Output code that will emit a label to divide up the exception table. */
143 (emit_except_table_label,
145 void, (FILE *stream),
146 default_emit_except_table_label)
148 /* Emit a directive for setting the personality for the function. */
150 (emit_except_personality,
151 "If the target implements @code{TARGET_ASM_UNWIND_EMIT}, this hook may be\
152 used to emit a directive to install a personality hook into the unwind\
153 info. This hook should not be used if dwarf2 unwind info is used.",
154 void, (rtx personality),
157 /* Emit any directives required to unwind this instruction. */
161 void, (FILE *stream, rtx insn),
165 (unwind_emit_before_insn,
166 "True if the @code{TARGET_ASM_UNWIND_EMIT} hook should be called before\
167 the assembly for @var{insn} has been emitted, false if the hook should\
168 be called afterward.",
171 /* Output an internal label. */
175 void, (FILE *stream, const char *prefix, unsigned long labelno),
176 default_internal_label)
178 /* Output label for the constant. */
180 (declare_constant_name,
182 void, (FILE *file, const char *name, const_tree expr, HOST_WIDE_INT size),
183 default_asm_declare_constant_name)
185 /* Emit a ttype table reference to a typeinfo object. */
192 /* Emit an assembler directive to set visibility for the symbol
193 associated with the tree decl. */
195 (assemble_visibility,
197 void, (tree decl, int visibility),
198 default_assemble_visibility)
200 /* Output the assembler code for entry to a function. */
204 void, (FILE *file, HOST_WIDE_INT size),
205 default_function_pro_epilogue)
207 /* Output the assembler code for end of prologue. */
209 (function_end_prologue,
214 /* Output the assembler code for start of epilogue. */
216 (function_begin_epilogue,
221 /* Output the assembler code for function exit. */
225 void, (FILE *file, HOST_WIDE_INT size),
226 default_function_pro_epilogue)
228 /* Initialize target-specific sections. */
235 /* Tell assembler to change to section NAME with attributes FLAGS.
236 If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with
237 which this section is associated. */
241 void, (const char *name, unsigned int flags, tree decl),
242 default_no_named_section)
244 /* Return a mask describing how relocations should be treated when
245 selecting sections. Bit 1 should be set if global relocations
246 should be placed in a read-write section; bit 0 should be set if
247 local relocations should be placed in a read-write section. */
252 default_reloc_rw_mask)
254 /* Return a section for EXP. It may be a DECL or a constant. RELOC
255 is nonzero if runtime relocations must be applied; bit 1 will be
256 set if the runtime relocations require non-local name resolution.
257 ALIGN is the required alignment of the data. */
261 section *, (tree exp, int reloc, unsigned HOST_WIDE_INT align),
262 default_select_section)
264 /* Return a section for X. MODE is X's mode and ALIGN is its
265 alignment in bits. */
269 section *, (enum machine_mode mode, rtx x, unsigned HOST_WIDE_INT align),
270 default_select_rtx_section)
272 /* Select a unique section name for DECL. RELOC is the same as
273 for SELECT_SECTION. */
277 void, (tree decl, int reloc),
278 default_unique_section)
280 /* Return the readonly data section associated with function DECL. */
282 (function_rodata_section,
284 section *, (tree decl),
285 default_function_rodata_section)
287 /* Output a constructor for a symbol with a given priority. */
291 void, (rtx symbol, int priority), NULL)
293 /* Output a destructor for a symbol with a given priority. */
297 void, (rtx symbol, int priority), NULL)
299 /* Output the assembler code for a thunk function. THUNK_DECL is the
300 declaration for the thunk function itself, FUNCTION is the decl for
301 the target function. DELTA is an immediate constant offset to be
302 added to THIS. If VCALL_OFFSET is nonzero, the word at
303 *(*this + vcall_offset) should be added to THIS. */
307 void, (FILE *file, tree thunk_fndecl, HOST_WIDE_INT delta,
308 HOST_WIDE_INT vcall_offset, tree function),
311 /* Determine whether output_mi_thunk would succeed. */
312 /* ??? Ideally, this hook would not exist, and success or failure
313 would be returned from output_mi_thunk directly. But there's
314 too much undo-able setup involved in invoking output_mi_thunk.
315 Could be fixed by making output_mi_thunk emit rtl instead of
316 text to the output file. */
318 (can_output_mi_thunk,
320 bool, (const_tree thunk_fndecl, HOST_WIDE_INT delta,
321 HOST_WIDE_INT vcall_offset, const_tree function),
322 hook_bool_const_tree_hwi_hwi_const_tree_false)
324 /* Output any boilerplate text needed at the beginning of a
332 /* Output any boilerplate text needed at the end of a translation unit. */
339 /* Output any boilerplate text needed at the beginning of an
340 LTO output stream. */
347 /* Output any boilerplate text needed at the end of an
348 LTO output stream. */
355 /* Output any boilerplace text needed at the end of a
356 translation unit before debug and unwind info is emitted. */
363 /* Output an assembler pseudo-op to declare a library function name
369 default_external_libcall)
371 /* Output an assembler directive to mark decl live. This instructs
372 linker to not dead code strip this symbol. */
374 (mark_decl_preserved,
376 void, (const char *symbol),
377 hook_void_constcharptr)
379 /* Output a record of the command line switches that have been passed. */
381 (record_gcc_switches,
383 int, (print_switch_type type, const char *text),
386 /* The name of the section that the example ELF implementation of
387 record_gcc_switches will use to store the information. Target
388 specific versions of record_gcc_switches may or may not use
391 (record_gcc_switches_section,
393 const char *, ".GCC.command.line")
395 /* Output the definition of a section anchor. */
400 default_asm_output_anchor)
402 /* Output a DTP-relative reference to a TLS symbol. */
404 (output_dwarf_dtprel,
406 void, (FILE *file, int size, rtx x),
409 /* Some target machines need to postscan each insn after it is output. */
411 (final_postscan_insn,
413 void, (FILE *file, rtx insn, rtx *opvec, int noperands),
416 /* Emit the trampoline template. This hook may be NULL. */
418 (trampoline_template,
424 (output_source_filename,
425 "Output COFF information or DWARF debugging information which indicates\
426 that filename @var{name} is the current source file to the stdio\
427 stream @var{file}.\n\
429 This target hook need not be defined if the standard form of output\
430 for the file format in use is appropriate.",
431 void ,(FILE *file, const char *name),
432 default_asm_output_source_filename)
435 (output_addr_const_extra,
437 bool, (FILE *file, rtx x),
438 default_asm_output_addr_const_extra)
440 /* ??? The TARGET_PRINT_OPERAND* hooks are part of the asm_out struct,
441 even though that is not reflected in the macro name to override their
444 #define HOOK_PREFIX "TARGET_"
446 /* Emit a machine-specific insn operand. */
447 /* ??? tm.texi only documents the old macro PRINT_OPERAND,
448 not this hook, and uses a different name for the argument FILE. */
452 void, (FILE *file, rtx x, int code),
453 default_print_operand)
455 /* Emit a machine-specific memory address. */
456 /* ??? tm.texi only documents the old macro PRINT_OPERAND_ADDRESS,
457 not this hook, and uses different argument names. */
459 (print_operand_address,
461 void, (FILE *file, rtx addr),
462 default_print_operand_address)
464 /* Determine whether CODE is a valid punctuation character for the
465 `print_operand' hook. */
466 /* ??? tm.texi only documents the old macro PRINT_OPERAND_PUNCT_VALID_P,
469 (print_operand_punct_valid_p,
471 bool ,(unsigned char code),
472 default_print_operand_punct_valid_p)
474 HOOK_VECTOR_END (asm_out)
476 /* Functions relating to instruction scheduling. All of these
477 default to null pointers, which haifa-sched.c looks for and handles. */
479 #define HOOK_PREFIX "TARGET_SCHED_"
480 HOOK_VECTOR (TARGET_SCHED, sched)
482 /* Given the current cost, COST, of an insn, INSN, calculate and
483 return a new cost based on its relationship to DEP_INSN through
484 the dependence LINK. The default is to make no adjustment. */
488 int, (rtx insn, rtx link, rtx dep_insn, int cost), NULL)
490 /* Adjust the priority of an insn as you see fit. Returns the new priority. */
494 int, (rtx insn, int priority), NULL)
496 /* Function which returns the maximum number of insns that can be
497 scheduled in the same machine cycle. This must be constant
498 over an entire compilation. The default is 1. */
504 /* Calculate how much this insn affects how many more insns we
505 can emit this cycle. Default is they all cost the same. */
509 int, (FILE *file, int verbose, rtx insn, int more), NULL)
511 /* Initialize machine-dependent scheduling code. */
515 void, (FILE *file, int verbose, int max_ready), NULL)
517 /* Finalize machine-dependent scheduling code. */
521 void, (FILE *file, int verbose), NULL)
523 /* Initialize machine-dependent function wide scheduling code. */
527 void, (FILE *file, int verbose, int old_max_uid), NULL)
529 /* Finalize machine-dependent function wide scheduling code. */
533 void, (FILE *file, int verbose), NULL)
535 /* Reorder insns in a machine-dependent fashion, in two different
536 places. Default does nothing. */
540 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
545 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
547 /* The following member value is a pointer to a function called
548 after evaluation forward dependencies of insns in chain given
549 by two parameter values (head and tail correspondingly). */
551 (dependencies_evaluation_hook,
553 void, (rtx head, rtx tail), NULL)
555 /* The values of the following four members are pointers to functions
556 used to simplify the automaton descriptions. dfa_pre_cycle_insn and
557 dfa_post_cycle_insn give functions returning insns which are used to
558 change the pipeline hazard recognizer state when the new simulated
559 processor cycle correspondingly starts and finishes. The function
560 defined by init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are
561 used to initialize the corresponding insns. The default values of
562 the members result in not changing the automaton state when the
563 new simulated processor cycle correspondingly starts and finishes. */
566 (init_dfa_pre_cycle_insn,
576 (init_dfa_post_cycle_insn,
581 (dfa_post_cycle_insn,
585 /* The values of the following two members are pointers to
586 functions used to simplify the automaton descriptions.
587 dfa_pre_advance_cycle and dfa_post_advance_cycle are getting called
588 immediately before and after cycle is advanced. */
591 (dfa_pre_advance_cycle,
596 (dfa_post_advance_cycle,
600 /* The following member value is a pointer to a function returning value
601 which defines how many insns in queue `ready' will we try for
602 multi-pass scheduling. If the member value is nonzero and the
603 function returns positive value, the DFA based scheduler will make
604 multi-pass scheduling for the first cycle. In other words, we will
605 try to choose ready insn which permits to start maximum number of
606 insns on the same cycle. */
608 (first_cycle_multipass_dfa_lookahead,
612 /* The following member value is pointer to a function controlling
613 what insns from the ready insn queue will be considered for the
614 multipass insn scheduling. If the hook returns zero for insn
615 passed as the parameter, the insn will be not chosen to be issued. */
617 (first_cycle_multipass_dfa_lookahead_guard,
619 int, (rtx insn), NULL)
621 /* The following member value is pointer to a function called by
622 the insn scheduler before issuing insn passed as the third
623 parameter on given cycle. If the hook returns nonzero, the
624 insn is not issued on given processors cycle. Instead of that,
625 the processor cycle is advanced. If the value passed through
626 the last parameter is zero, the insn ready queue is not sorted
627 on the new cycle start as usually. The first parameter passes
628 file for debugging output. The second one passes the scheduler
629 verbose level of the debugging output. The forth and the fifth
630 parameter values are correspondingly processor cycle on which
631 the previous insn has been issued and the current processor cycle. */
635 int, (FILE *dump, int verbose, rtx insn, int last_clock,
636 int clock, int *sort_p),
639 /* The following member value is a pointer to a function called by the
640 insn scheduler. It should return true if there exists a dependence
641 which is considered costly by the target, between the insn
642 DEP_PRO (&_DEP), and the insn DEP_CON (&_DEP). The first parameter is
643 the dep that represents the dependence between the two insns. The
644 second argument is the cost of the dependence as estimated by
645 the scheduler. The last argument is the distance in cycles
646 between the already scheduled insn (first parameter) and the
647 second insn (second parameter). */
649 (is_costly_dependence,
651 bool, (struct _dep *_dep, int cost, int distance), NULL)
655 "Given the current cost, @var{cost}, of an insn, @var{insn}, calculate and\
656 return a new cost based on its relationship to @var{dep_insn} through the\
657 dependence of weakness @var{dw}. The default is to make no adjustment.",
658 int, (rtx insn, int dep_type1, rtx dep_insn, int cost, int dw), NULL)
660 /* The following member value is a pointer to a function called
661 by the insn scheduler. This hook is called to notify the backend
662 that new instructions were emitted. */
668 /* Next 5 functions are for multi-point scheduling. */
670 /* Allocate memory for scheduler context. */
672 (alloc_sched_context,
674 void *, (void), NULL)
676 /* Fills the context from the local machine scheduler context. */
680 void, (void *tc, bool clean_p), NULL)
682 /* Sets local machine scheduler context to a saved value. */
686 void, (void *tc), NULL)
688 /* Clears a scheduler context so it becomes like after init. */
690 (clear_sched_context,
692 void, (void *tc), NULL)
694 /* Frees the scheduler context. */
698 void, (void *tc), NULL)
700 /* The following member value is a pointer to a function called
701 by the insn scheduler.
702 The first parameter is an instruction, the second parameter is the type
703 of the requested speculation, and the third parameter is a pointer to the
704 speculative pattern of the corresponding type (set if return value == 1).
706 -1, if there is no pattern, that will satisfy the requested speculation type,
707 0, if current pattern satisfies the requested speculation type,
708 1, if pattern of the instruction should be changed to the newly
713 int, (rtx insn, int request, rtx *new_pat), NULL)
715 /* The following member value is a pointer to a function called
716 by the insn scheduler. It should return true if the check instruction
717 passed as the parameter needs a recovery block. */
721 bool, (int dep_status), NULL)
723 /* The following member value is a pointer to a function called
724 by the insn scheduler. It should return a pattern for the check
726 The first parameter is a speculative instruction, the second parameter
727 is the label of the corresponding recovery block (or null, if it is a
728 simple check). If the mutation of the check is requested (e.g. from
729 ld.c to chk.a), the third parameter is true - in this case the first
730 parameter is the previous check. */
734 rtx, (rtx insn, rtx label, int mutate_p), NULL)
736 /* The following member value is a pointer to a function controlling
737 what insns from the ready insn queue will be considered for the
738 multipass insn scheduling. If the hook returns zero for the insn
739 passed as the parameter, the insn will not be chosen to be
740 issued. This hook is used to discard speculative instructions,
741 that stand at the first position of the ready list. */
743 (first_cycle_multipass_dfa_lookahead_guard_spec,
745 bool, (const_rtx insn), NULL)
747 /* The following member value is a pointer to a function that provides
748 information about the speculation capabilities of the target.
749 The parameter is a pointer to spec_info variable. */
753 void, (struct spec_info_def *spec_info), NULL)
757 "Return speculation types of instruction @var{insn}.",
758 int, (rtx insn), NULL)
761 (get_insn_checked_ds,
762 "Return speculation types that are checked for instruction @var{insn}",
763 int, (rtx insn), NULL)
767 "Return bool if rtx scanning should just skip current layer and\
768 advance to the inner rtxes.",
769 bool, (const_rtx x), NULL)
771 /* The following member value is a pointer to a function that provides
772 information about the target resource-based lower bound which is
773 used by the swing modulo scheduler. The parameter is a pointer
778 int, (struct ddg *g), NULL)
780 /* The following member value is a function that initializes dispatch
781 schedling and adds instructions to dispatch window according to its
786 void, (rtx insn, int x),
789 /* The following member value is a a function that returns true is
790 dispatch schedling is supported in hardware and condition passed
791 as the second parameter is true. */
795 bool, (rtx insn, int x),
796 hook_bool_rtx_int_false)
798 HOOK_VECTOR_END (sched)
800 /* Functions relating to vectorization. */
802 #define HOOK_PREFIX "TARGET_VECTORIZE_"
803 HOOK_VECTOR (TARGET_VECTORIZE, vectorize)
805 /* The following member value is a pointer to a function called
806 by the vectorizer, and return the decl of the target builtin
809 (builtin_mask_for_load,
813 /* Returns a code for builtin that realizes vectorized version of
814 function, or NULL_TREE if not available. */
816 (builtin_vectorized_function,
818 tree, (tree fndecl, tree vec_type_out, tree vec_type_in),
819 default_builtin_vectorized_function)
821 /* Returns a function declaration for a builtin that realizes the
822 vector conversion, or NULL_TREE if not available. */
826 tree, (unsigned code, tree dest_type, tree src_type),
827 default_builtin_vectorized_conversion)
829 /* Target builtin that implements vector widening multiplication.
830 builtin_mul_widen_eve computes the element-by-element products
831 for the even elements, and builtin_mul_widen_odd computes the
832 element-by-element products for the odd elements. */
834 (builtin_mul_widen_even,
836 tree, (tree x), NULL)
839 (builtin_mul_widen_odd,
841 tree, (tree x), NULL)
843 /* Cost of different vector/scalar statements in vectorization cost
844 model. In case of misaligned vector loads and stores the cost depends
845 on the data type and misalignment value. */
847 (builtin_vectorization_cost,
849 int, (enum vect_cost_for_stmt type_of_cost, tree vectype, int misalign),
850 default_builtin_vectorization_cost)
852 /* Return true if vector alignment is reachable (by peeling N
853 iterations) for the given type. */
855 (vector_alignment_reachable,
857 bool, (const_tree type, bool is_packed),
858 default_builtin_vector_alignment_reachable)
860 /* Target builtin that implements vector permute. */
864 tree, (tree type, tree *mask_element_type), NULL)
866 /* Return true if a vector created for builtin_vec_perm is valid. */
868 (builtin_vec_perm_ok,
870 bool, (tree vec_type, tree mask),
871 hook_bool_tree_tree_true)
873 /* Return true if the target supports misaligned store/load of a
874 specific factor denoted in the third parameter. The last parameter
875 is true if the access is defined in a packed struct. */
877 (support_vector_misalignment,
880 (enum machine_mode mode, const_tree type, int misalignment, bool is_packed),
881 default_builtin_support_vector_misalignment)
883 /* Return units per SIMD word. */
885 (units_per_simd_word,
888 (enum machine_mode mode),
889 default_units_per_simd_word)
891 HOOK_VECTOR_END (vectorize)
894 #define HOOK_PREFIX "TARGET_"
896 /* The initial value of target_flags. */
898 (default_target_flags,
902 /* Allow target specific overriding of option settings after options have
903 been changed by an attribute or pragma or when it is reset at the
904 end of the code affected by an attribute or pragma. */
906 (override_options_after_change,
911 /* Handle target switch CODE (an OPT_* value). ARG is the argument
912 passed to the switch; it is NULL if no argument was. VALUE is the
913 value of ARG if CODE specifies a UInteger option, otherwise it is
914 1 if the positive form of the switch was used and 0 if the negative
915 form was. Return true if the switch was valid. */
919 bool, (size_t code, const char *arg, int value),
920 hook_bool_size_t_constcharptr_int_true)
922 /* ??? Documenting this hook requires a GFDL license grant. */
925 "Handle target-specific parts of specifying -Ofast.",
929 /* Display extra, target specific information in response to a
930 --target-help switch. */
937 (eh_return_filter_mode,
938 "Return machine mode for filter value.",
939 enum machine_mode, (void),
940 default_eh_return_filter_mode)
942 /* Return machine mode for libgcc expanded cmp instructions. */
944 (libgcc_cmp_return_mode,
946 enum machine_mode, (void),
947 default_libgcc_cmp_return_mode)
949 /* Return machine mode for libgcc expanded shift instructions. */
951 (libgcc_shift_count_mode,
953 enum machine_mode, (void),
954 default_libgcc_shift_count_mode)
956 /* Return machine mode to be used for _Unwind_Word type. */
960 enum machine_mode, (void),
961 default_unwind_word_mode)
963 /* Given two decls, merge their attributes and return the result. */
965 (merge_decl_attributes,
967 tree, (tree olddecl, tree newdecl),
968 merge_decl_attributes)
970 /* Given two types, merge their attributes and return the result. */
972 (merge_type_attributes,
974 tree, (tree type1, tree type2),
975 merge_type_attributes)
977 /* Table of machine attributes and functions to handle them.
982 const struct attribute_spec *, NULL)
984 /* Return true iff attribute NAME expects a plain identifier as its first
987 (attribute_takes_identifier_p,
989 bool, (const_tree name),
990 hook_bool_const_tree_false)
992 /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
993 one if they are compatible and two if they are nearly compatible
994 (which causes a warning to be generated). */
996 (comp_type_attributes,
998 int, (const_tree type1, const_tree type2),
999 hook_int_const_tree_const_tree_1)
1001 /* Assign default attributes to the newly defined TYPE. */
1003 (set_default_type_attributes,
1008 /* Insert attributes on the newly created DECL. */
1012 void, (tree node, tree *attr_ptr),
1013 hook_void_tree_treeptr)
1015 /* Return true if FNDECL (which has at least one machine attribute)
1016 can be inlined despite its machine attributes, false otherwise. */
1018 (function_attribute_inlinable_p,
1020 bool, (const_tree fndecl),
1021 hook_bool_const_tree_false)
1023 /* Return true if bitfields in RECORD_TYPE should follow the
1024 Microsoft Visual C++ bitfield layout rules. */
1026 (ms_bitfield_layout_p,
1028 bool, (const_tree record_type),
1029 hook_bool_const_tree_false)
1031 /* True if the target supports decimal floating point. */
1033 (decimal_float_supported_p,
1036 default_decimal_float_supported_p)
1038 /* True if the target supports fixed-point. */
1040 (fixed_point_supported_p,
1043 default_fixed_point_supported_p)
1045 /* Return true if anonymous bitfields affect structure alignment. */
1047 (align_anon_bitfield,
1050 hook_bool_void_false)
1052 /* Return true if volatile bitfields should use the narrowest type possible.
1053 Return false if they should use the container type. */
1055 (narrow_volatile_bitfield,
1058 hook_bool_void_false)
1060 /* Set up target-specific built-in functions. */
1067 /* Initialize (if INITIALIZE_P is true) and return the target-specific
1068 built-in function decl for CODE.
1069 Return NULL if that is not possible. Return error_mark_node if CODE
1070 is outside of the range of valid target builtin function codes. */
1074 tree, (unsigned code, bool initialize_p), NULL)
1076 /* Expand a target-specific builtin. */
1081 (tree exp, rtx target, rtx subtarget, enum machine_mode mode, int ignore),
1082 default_expand_builtin)
1084 /* Select a replacement for a target-specific builtin. This is done
1085 *before* regular type checking, and so allows the target to
1086 implement a crude form of function overloading. The result is a
1087 complete expression that implements the operation. PARAMS really
1088 has type VEC(tree,gc)*, but we don't want to include tree.h here. */
1090 (resolve_overloaded_builtin,
1092 tree, (unsigned int /*location_t*/ loc, tree fndecl, void *arglist), NULL)
1094 /* Fold a target-specific builtin. */
1098 tree, (tree fndecl, int n_args, tree *argp, bool ignore),
1099 hook_tree_tree_int_treep_bool_null)
1101 /* Returns a code for a target-specific builtin that implements
1102 reciprocal of the function, or NULL_TREE if not available. */
1104 (builtin_reciprocal,
1106 tree, (unsigned fn, bool md_fn, bool sqrt),
1107 default_builtin_reciprocal)
1109 /* For a vendor-specific TYPE, return a pointer to a statically-allocated
1110 string containing the C++ mangling for TYPE. In all other cases, return
1115 const char *, (const_tree type),
1116 hook_constcharptr_const_tree_null)
1118 /* Make any adjustments to libfunc names needed for this target. */
1125 /* Given a decl, a section name, and whether the decl initializer
1126 has relocs, choose attributes for the section. */
1127 /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */
1129 (section_type_flags,
1131 unsigned int, (tree decl, const char *name, int reloc),
1132 default_section_type_flags)
1134 /* True if new jumps cannot be created, to replace existing ones or
1135 not, at the current point in the compilation. */
1137 (cannot_modify_jumps_p,
1140 hook_bool_void_false)
1142 /* Return a register class for which branch target register
1143 optimizations should be applied. */
1145 (branch_target_register_class,
1147 reg_class_t, (void),
1148 default_branch_target_register_class)
1150 /* Return true if branch target register optimizations should include
1151 callee-saved registers that are not already live during the current
1152 function. AFTER_PE_GEN is true if prologues and epilogues have
1153 already been generated. */
1155 (branch_target_register_callee_saved,
1157 bool, (bool after_prologue_epilogue_gen),
1158 hook_bool_bool_false)
1160 /* Return true if the target supports conditional execution. */
1162 (have_conditional_execution,
1165 default_have_conditional_execution)
1167 /* Return a new value for loop unroll size. */
1169 (loop_unroll_adjust,
1171 unsigned, (unsigned nunroll, struct loop *loop),
1174 /* True if the constant X cannot be placed in the constant pool. */
1176 (cannot_force_const_mem,
1179 hook_bool_rtx_false)
1182 (cannot_copy_insn_p,
1183 "True if the insn @var{x} cannot be duplicated.",
1186 /* True if X is considered to be commutative. */
1190 bool, (const_rtx x, int outer_code),
1191 hook_bool_const_rtx_commutative_p)
1193 /* True if ADDR is an address-expression whose effect depends
1194 on the mode of the memory reference it is used in. */
1196 (mode_dependent_address_p,
1198 bool, (const_rtx addr),
1199 default_mode_dependent_address_p)
1201 /* Given an invalid address X for a given machine mode, try machine-specific
1202 ways to make it legitimate. Return X or an invalid address on failure. */
1204 (legitimize_address,
1206 rtx, (rtx x, rtx oldx, enum machine_mode mode),
1207 default_legitimize_address)
1209 /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */
1211 (delegitimize_address,
1214 delegitimize_mem_from_attrs)
1216 /* Given an address RTX, say whether it is valid. */
1218 (legitimate_address_p,
1220 bool, (enum machine_mode mode, rtx x, bool strict),
1221 default_legitimate_address_p)
1223 /* True if the given constant can be put into an object_block. */
1225 (use_blocks_for_constant_p,
1227 bool, (enum machine_mode mode, const_rtx x),
1228 hook_bool_mode_const_rtx_false)
1230 /* The minimum and maximum byte offsets for anchored addresses. */
1241 /* True if section anchors can be used to access the given symbol. */
1243 (use_anchors_for_symbol_p,
1245 bool, (const_rtx x),
1246 default_use_anchors_for_symbol_p)
1248 /* True if it is OK to do sibling call optimization for the specified
1249 call expression EXP. DECL will be the called function, or NULL if
1250 this is an indirect call. */
1252 (function_ok_for_sibcall,
1254 bool, (tree decl, tree exp),
1255 hook_bool_tree_tree_false)
1257 /* Establish appropriate back-end context for processing the function
1258 FNDECL. The argument might be NULL to indicate processing at top
1259 level, outside of any function scope. */
1261 (set_current_function,
1263 void, (tree decl), hook_void_tree)
1265 /* True if EXP should be placed in a "small data" section. */
1269 bool, (const_tree exp),
1270 hook_bool_const_tree_false)
1272 /* True if EXP names an object for which name resolution must resolve
1273 to the current executable or shared library. */
1277 bool, (const_tree exp),
1278 default_binds_local_p)
1280 /* Check if profiling code is before or after prologue. */
1282 (profile_before_prologue,
1283 "It returns true if target wants profile code emitted before prologue.\n\n\
1284 The default version of this hook use the target macro\n\
1285 @code{PROFILE_BEFORE_PROLOGUE}.",
1287 default_profile_before_prologue)
1289 /* Modify and return the identifier of a DECL's external name,
1290 originally identified by ID, as required by the target,
1291 (eg, append @nn to windows32 stdcall function names).
1292 The default is to return ID without modification. */
1294 (mangle_decl_assembler_name,
1296 tree, (tree decl, tree id),
1297 default_mangle_decl_assembler_name)
1299 /* Do something target-specific to record properties of the DECL into
1300 the associated SYMBOL_REF. */
1302 (encode_section_info,
1304 void, (tree decl, rtx rtl, int new_decl_p),
1305 default_encode_section_info)
1307 /* Undo the effects of encode_section_info on the symbol string. */
1309 (strip_name_encoding,
1311 const char *, (const char *name),
1312 default_strip_name_encoding)
1314 /* If shift optabs for MODE are known to always truncate the shift count,
1315 return the mask that they apply. Return 0 otherwise. */
1317 (shift_truncation_mask,
1319 unsigned HOST_WIDE_INT, (enum machine_mode mode),
1320 default_shift_truncation_mask)
1322 /* Return the number of divisions in the given MODE that should be present,
1323 so that it is profitable to turn the division into a multiplication by
1326 (min_divisions_for_recip_mul,
1328 unsigned int, (enum machine_mode mode),
1329 default_min_divisions_for_recip_mul)
1331 /* If the representation of integral MODE is such that values are
1332 always sign-extended to a wider mode MODE_REP then return
1333 SIGN_EXTEND. Return UNKNOWN otherwise. */
1334 /* Note that the return type ought to be RTX_CODE, but that's not
1335 necessarily defined at this point. */
1339 int, (enum machine_mode mode, enum machine_mode rep_mode),
1340 default_mode_rep_extended)
1342 /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */
1344 (valid_pointer_mode,
1346 bool, (enum machine_mode mode),
1347 default_valid_pointer_mode)
1349 /* Support for named address spaces. */
1351 #define HOOK_PREFIX "TARGET_ADDR_SPACE_"
1352 HOOK_VECTOR (TARGET_ADDR_SPACE_HOOKS, addr_space)
1354 /* MODE to use for a pointer into another address space. */
1358 enum machine_mode, (addr_space_t address_space),
1359 default_addr_space_pointer_mode)
1361 /* MODE to use for an address in another address space. */
1365 enum machine_mode, (addr_space_t address_space),
1366 default_addr_space_address_mode)
1368 /* True if MODE is valid for a pointer in __attribute__((mode("MODE")))
1369 in another address space. */
1371 (valid_pointer_mode,
1373 bool, (enum machine_mode mode, addr_space_t as),
1374 default_addr_space_valid_pointer_mode)
1376 /* True if an address is a valid memory address to a given named address
1377 space for a given mode. */
1379 (legitimate_address_p,
1381 bool, (enum machine_mode mode, rtx exp, bool strict, addr_space_t as),
1382 default_addr_space_legitimate_address_p)
1384 /* Return an updated address to convert an invalid pointer to a named
1385 address space to a valid one. If NULL_RTX is returned use machine
1386 independent methods to make the address valid. */
1388 (legitimize_address,
1390 rtx, (rtx x, rtx oldx, enum machine_mode mode, addr_space_t as),
1391 default_addr_space_legitimize_address)
1393 /* True if one named address space is a subset of another named address. */
1397 bool, (addr_space_t superset, addr_space_t subset),
1398 default_addr_space_subset_p)
1400 /* Function to convert an rtl expression from one address space to another. */
1404 rtx, (rtx op, tree from_type, tree to_type),
1405 default_addr_space_convert)
1407 HOOK_VECTOR_END (addr_space)
1410 #define HOOK_PREFIX "TARGET_"
1412 /* True if MODE is valid for the target. By "valid", we mean able to
1413 be manipulated in non-trivial ways. In particular, this means all
1414 the arithmetic is supported. */
1416 (scalar_mode_supported_p,
1418 bool, (enum machine_mode mode),
1419 default_scalar_mode_supported_p)
1421 /* Similarly for vector modes. "Supported" here is less strict. At
1422 least some operations are supported; need to check optabs or builtins
1423 for further details. */
1425 (vector_mode_supported_p,
1427 bool, (enum machine_mode mode),
1428 hook_bool_mode_false)
1430 /* Compute cost of moving data from a register of class FROM to one of
1433 (register_move_cost,
1435 int, (enum machine_mode mode, reg_class_t from, reg_class_t to),
1436 default_register_move_cost)
1438 /* Compute cost of moving registers to/from memory. */
1439 /* ??? Documenting the argument types for this hook requires a GFDL
1440 license grant. Also, the documentation uses a different name for RCLASS. */
1444 int, (enum machine_mode mode, reg_class_t rclass, bool in),
1445 default_memory_move_cost)
1447 /* True for MODE if the target expects that registers in this mode will
1448 be allocated to registers in a small register class. The compiler is
1449 allowed to use registers explicitly used in the rtl as spill registers
1450 but it should prevent extending the lifetime of these registers. */
1452 (small_register_classes_for_mode_p,
1454 bool, (enum machine_mode mode),
1455 hook_bool_mode_false)
1457 /* Compute a (partial) cost for rtx X. Return true if the complete
1458 cost has been computed, and false if subexpressions should be
1459 scanned. In either case, *TOTAL contains the cost result. */
1460 /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's
1461 not necessarily defined at this point. */
1465 bool, (rtx x, int code, int outer_code, int *total, bool speed),
1466 hook_bool_rtx_int_int_intp_bool_false)
1468 /* Compute the cost of X, used as an address. Never called with
1469 invalid addresses. */
1473 int, (rtx address, bool speed),
1474 default_address_cost)
1476 /* Return where to allocate pseudo for a given hard register initial value. */
1478 (allocate_initial_value,
1480 rtx, (rtx hard_reg), NULL)
1482 /* Return nonzero if evaluating UNSPEC[_VOLATILE] X might cause a trap.
1483 FLAGS has the same meaning as in rtlanal.c: may_trap_p_1. */
1487 int, (const_rtx x, unsigned flags),
1488 default_unspec_may_trap_p)
1490 /* Given a register, this hook should return a parallel of registers
1491 to represent where to find the register pieces. Define this hook
1492 if the register and its mode are represented in Dwarf in
1493 non-contiguous locations, or if the register should be
1494 represented in more than one register in Dwarf. Otherwise, this
1495 hook should return NULL_RTX. */
1497 (dwarf_register_span,
1502 /* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
1503 entries not corresponding directly to registers below
1504 FIRST_PSEUDO_REGISTER, this hook should generate the necessary
1505 code, given the address of the table. */
1507 (init_dwarf_reg_sizes_extra,
1509 void, (tree address),
1512 /* Fetch the fixed register(s) which hold condition codes, for
1513 targets where it makes sense to look for duplicate assignments to
1514 the condition codes. This should return true if there is such a
1515 register, false otherwise. The arguments should be set to the
1516 fixed register numbers. Up to two condition code registers are
1517 supported. If there is only one for this target, the int pointed
1518 at by the second argument should be set to -1. */
1520 (fixed_condition_code_regs,
1522 bool, (unsigned int *p1, unsigned int *p2),
1523 hook_bool_uintp_uintp_false)
1525 /* If two condition code modes are compatible, return a condition
1526 code mode which is compatible with both, such that a comparison
1527 done in the returned mode will work for both of the original
1528 modes. If the condition code modes are not compatible, return
1531 (cc_modes_compatible,
1533 enum machine_mode, (enum machine_mode m1, enum machine_mode m2),
1534 default_cc_modes_compatible)
1536 /* Do machine-dependent code transformations. Called just before
1537 delayed-branch scheduling. */
1539 (machine_dependent_reorg,
1543 /* Create the __builtin_va_list type. */
1545 (build_builtin_va_list,
1548 std_build_builtin_va_list)
1550 /* Enumerate the va list variants. */
1554 int, (int idx, const char **pname, tree *ptree),
1557 /* Get the cfun/fndecl calling abi __builtin_va_list type. */
1561 tree, (tree fndecl),
1564 /* Get the __builtin_va_list type dependent on input type. */
1566 (canonical_va_list_type,
1569 std_canonical_va_list_type)
1571 /* ??? Documenting this hook requires a GFDL license grant. */
1573 (expand_builtin_va_start,
1574 "Expand the @code{__builtin_va_start} builtin.",
1575 void, (tree valist, rtx nextarg), NULL)
1577 /* Gimplifies a VA_ARG_EXPR. */
1579 (gimplify_va_arg_expr,
1581 tree, (tree valist, tree type, gimple_seq *pre_p, gimple_seq *post_p),
1582 std_gimplify_va_arg_expr)
1584 /* Validity-checking routines for PCH files, target-specific.
1585 get_pch_validity returns a pointer to the data to be stored,
1586 and stores the size in its argument. pch_valid_p gets the same
1587 information back and returns NULL if the PCH is valid,
1588 or an error message if not. */
1592 void *, (size_t *sz),
1593 default_get_pch_validity)
1598 const char *, (const void *data, size_t sz),
1599 default_pch_valid_p)
1601 /* If nonnull, this function checks whether a PCH file with the
1602 given set of target flags can be used. It returns NULL if so,
1603 otherwise it returns an error message. */
1605 (check_pch_target_flags,
1607 const char *, (int pch_flags), NULL)
1609 /* True if the compiler should give an enum type only as many
1610 bytes as it takes to represent the range of possible values of
1613 (default_short_enums,
1616 hook_bool_void_false)
1618 /* This target hook returns an rtx that is used to store the address
1619 of the current frame into the built-in setjmp buffer. */
1621 (builtin_setjmp_frame_value,
1624 default_builtin_setjmp_frame_value)
1626 /* This target hook should add STRING_CST trees for any hard regs
1627 the port wishes to automatically clobber for an asm. */
1631 tree, (tree outputs, tree inputs, tree clobbers),
1632 hook_tree_tree_tree_tree_3rd_identity)
1634 /* This target hook allows the backend to specify a calling convention
1635 in the debug information. This function actually returns an
1636 enum dwarf_calling_convention, but because of forward declarations
1637 and not wanting to include dwarf2.h everywhere target.h is included
1638 the function is being declared as an int. */
1640 (dwarf_calling_convention,
1642 int, (const_tree function),
1643 hook_int_const_tree_0)
1645 /* This target hook allows the backend to emit frame-related insns that
1646 contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info
1647 engine will invoke it on insns of the form
1648 (set (reg) (unspec [...] UNSPEC_INDEX))
1650 (set (reg) (unspec_volatile [...] UNSPECV_INDEX))
1651 to let the backend emit the call frame instructions. */
1653 (dwarf_handle_frame_unspec,
1655 void, (const char *label, rtx pattern, int index), NULL)
1657 /* ??? Documenting this hook requires a GFDL license grant. */
1659 (stdarg_optimize_hook,
1660 "Perform architecture specific checking of statements gimplified\
1661 from @code{VA_ARG_EXPR}. @var{stmt} is the statement. Returns true if\
1662 the statement doesn't need to be checked for @code{va_list} references.",
1663 bool, (struct stdarg_info *ai, const_gimple stmt), NULL)
1665 /* This target hook allows the operating system to override the DECL
1666 that represents the external variable that contains the stack
1667 protection guard variable. The type of this DECL is ptr_type_node. */
1669 (stack_protect_guard,
1672 default_stack_protect_guard)
1674 /* This target hook allows the operating system to override the CALL_EXPR
1675 that is invoked when a check vs the guard variable fails. */
1677 (stack_protect_fail,
1680 default_external_stack_protect_fail)
1683 (supports_split_stack,
1684 "Whether this target supports splitting the stack. This is called\
1685 after options have been parsed, so the target may reject splitting\
1686 the stack in some configurations. The default version of this hook\
1687 returns false. If @var{report} is true, this function may issue a warning\
1688 or error; if @var{report} is false, it must simply return a value",
1690 hook_bool_bool_false)
1692 /* Returns NULL if target supports the insn within a doloop block,
1693 otherwise it returns an error message. */
1695 (invalid_within_doloop,
1697 const char *, (const_rtx insn),
1698 default_invalid_within_doloop)
1701 (valid_dllimport_attribute_p,
1702 "@var{decl} is a variable or function with @code{__attribute__((dllimport))}\
1703 specified. Use this hook if the target needs to add extra validation\
1704 checks to @code{handle_dll_attribute}.",
1705 bool, (const_tree decl),
1706 hook_bool_const_tree_true)
1708 /* If non-zero, align constant anchors in CSE to a multiple of this
1713 unsigned HOST_WIDE_INT, 0)
1715 /* Functions relating to calls - argument passing, returns, etc. */
1716 /* Members of struct call have no special macro prefix. */
1717 HOOK_VECTOR (TARGET_CALLS, calls)
1720 (promote_function_mode,
1722 enum machine_mode, (const_tree type, enum machine_mode mode, int *punsignedp,
1723 const_tree funtype, int for_return),
1724 default_promote_function_mode)
1727 (promote_prototypes,
1729 bool, (const_tree fntype),
1730 hook_bool_const_tree_false)
1735 rtx, (tree fndecl, int incoming),
1736 hook_rtx_tree_int_null)
1740 bool, (const_tree type, const_tree fntype),
1741 default_return_in_memory)
1746 bool, (const_tree type),
1747 hook_bool_const_tree_false)
1749 /* Return true if a parameter must be passed by reference. TYPE may
1750 be null if this is a libcall. CA may be null if this query is
1751 from __builtin_va_arg. */
1756 (CUMULATIVE_ARGS *cum, enum machine_mode mode, const_tree type, bool named),
1757 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
1760 (expand_builtin_saveregs,
1763 default_expand_builtin_saveregs)
1765 /* Returns pretend_argument_size. */
1767 (setup_incoming_varargs,
1769 void, (CUMULATIVE_ARGS *args_so_far, enum machine_mode mode, tree type,
1770 int *pretend_args_size, int second_time),
1771 default_setup_incoming_varargs)
1774 (strict_argument_naming,
1776 bool, (CUMULATIVE_ARGS *ca),
1777 hook_bool_CUMULATIVE_ARGS_false)
1779 /* Returns true if we should use
1780 targetm.calls.setup_incoming_varargs() and/or
1781 targetm.calls.strict_argument_naming(). */
1783 (pretend_outgoing_varargs_named,
1785 bool, (CUMULATIVE_ARGS *ca),
1786 default_pretend_outgoing_varargs_named)
1788 /* Given a complex type T, return true if a parameter of type T
1789 should be passed as two scalars. */
1793 bool, (const_tree type), NULL)
1795 /* Return true if type T, mode MODE, may not be passed in registers,
1796 but must be passed on the stack. */
1797 /* ??? This predicate should be applied strictly after pass-by-reference.
1798 Need audit to verify that this is the case. */
1800 (must_pass_in_stack,
1802 bool, (enum machine_mode mode, const_tree type),
1803 must_pass_in_stack_var_size_or_pad)
1805 /* Return true if type TYPE, mode MODE, which is passed by reference,
1806 should have the object copy generated by the callee rather than
1807 the caller. It is never called for TYPE requiring constructors. */
1812 (CUMULATIVE_ARGS *cum, enum machine_mode mode, const_tree type, bool named),
1813 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
1815 /* Return zero for arguments passed entirely on the stack or entirely
1816 in registers. If passed in both, return the number of bytes passed
1817 in registers; the balance is therefore passed on the stack. */
1821 int, (CUMULATIVE_ARGS *cum, enum machine_mode mode, tree type, bool named),
1822 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0)
1824 /* Update the state in CA to advance past an argument in the
1825 argument list. The values MODE, TYPE, and NAMED describe that
1827 /* ??? tm.texi still only describes the old macro. */
1829 (function_arg_advance,
1832 (CUMULATIVE_ARGS *ca, enum machine_mode mode, const_tree type, bool named),
1833 default_function_arg_advance)
1835 /* Return zero if the argument described by the state of CA should
1836 be placed on a stack, or a hard register in which to store the
1837 argument. The values MODE, TYPE, and NAMED describe that
1839 /* ??? tm.texi still only describes the old macro. */
1843 rtx, (CUMULATIVE_ARGS *ca, enum machine_mode mode, const_tree type,
1845 default_function_arg)
1847 /* Likewise, but for machines with register windows. Return the
1848 location where the argument will appear to the callee. */
1849 /* ??? tm.texi still only describes the old macro. */
1851 (function_incoming_arg,
1853 rtx, (CUMULATIVE_ARGS *ca, enum machine_mode mode, const_tree type,
1855 default_function_incoming_arg)
1857 /* Return the diagnostic message string if function without a prototype
1858 is not allowed for this 'val' argument; NULL otherwise. */
1860 (invalid_arg_for_unprototyped_fn,
1862 const char *, (const_tree typelist, const_tree funcdecl, const_tree val),
1863 hook_invalid_arg_for_unprototyped_fn)
1865 /* Return an rtx for the return value location of the function
1866 specified by FN_DECL_OR_TYPE with a return type of RET_TYPE. */
1870 rtx, (const_tree ret_type, const_tree fn_decl_or_type, bool outgoing),
1871 default_function_value)
1873 /* Return the rtx for the result of a libcall of mode MODE,
1874 calling the function FN_NAME. */
1878 rtx, (enum machine_mode mode, const_rtx fun),
1879 default_libcall_value)
1881 /* Return true if REGNO is a possible register number for
1882 a function value as seen by the caller. */
1884 (function_value_regno_p,
1886 bool, (const unsigned int regno),
1887 default_function_value_regno_p)
1889 /* ??? Documenting this hook requires a GFDL license grant. */
1891 (internal_arg_pointer,
1892 "Return an rtx for the argument pointer incoming to the\
1895 default_internal_arg_pointer)
1897 /* Update the current function stack boundary if needed. */
1899 (update_stack_boundary,
1903 /* Handle stack alignment and return an rtx for Dynamic Realign
1904 Argument Pointer if necessary. */
1910 /* Return true if all function parameters should be spilled to the
1913 (allocate_stack_slots_for_args,
1916 hook_bool_void_true)
1918 /* Return an rtx for the static chain for FNDECL. If INCOMING_P is true,
1919 then it should be for the callee; otherwise for the caller. */
1923 rtx, (const_tree fndecl, bool incoming_p),
1924 default_static_chain)
1926 /* Fill in the trampoline at MEM with a call to FNDECL and a
1927 static chain value of CHAIN. */
1931 void, (rtx m_tramp, tree fndecl, rtx static_chain),
1932 default_trampoline_init)
1934 /* Adjust the address of the trampoline in a target-specific way. */
1936 (trampoline_adjust_address,
1938 rtx, (rtx addr), NULL)
1940 /* Return the number of bytes of its own arguments that a function
1941 pops on returning, or 0 if the function pops no arguments and the
1942 caller must therefore pop them all after the function returns. */
1943 /* ??? tm.texi has no types for the parameters. */
1947 int, (tree fundecl, tree funtype, int size),
1948 default_return_pops_args)
1950 HOOK_VECTOR_END (calls)
1952 /* Return the diagnostic message string if conversion from FROMTYPE
1953 to TOTYPE is not allowed, NULL otherwise. */
1955 (invalid_conversion,
1957 const char *, (const_tree fromtype, const_tree totype),
1958 hook_constcharptr_const_tree_const_tree_null)
1960 /* Return the diagnostic message string if the unary operation OP is
1961 not permitted on TYPE, NULL otherwise. */
1965 const char *, (int op, const_tree type),
1966 hook_constcharptr_int_const_tree_null)
1968 /* Return the diagnostic message string if the binary operation OP
1969 is not permitted on TYPE1 and TYPE2, NULL otherwise. */
1973 const char *, (int op, const_tree type1, const_tree type2),
1974 hook_constcharptr_int_const_tree_const_tree_null)
1976 /* Return the diagnostic message string if TYPE is not valid as a
1977 function parameter type, NULL otherwise. */
1979 (invalid_parameter_type,
1981 const char *, (const_tree type),
1982 hook_constcharptr_const_tree_null)
1984 /* Return the diagnostic message string if TYPE is not valid as a
1985 function return type, NULL otherwise. */
1987 (invalid_return_type,
1989 const char *, (const_tree type),
1990 hook_constcharptr_const_tree_null)
1992 /* If values of TYPE are promoted to some other type when used in
1993 expressions (analogous to the integer promotions), return that type,
1994 or NULL_TREE otherwise. */
1998 tree, (const_tree type),
1999 hook_tree_const_tree_null)
2001 /* Convert EXPR to TYPE, if target-specific types with special conversion
2002 rules are involved. Return the converted expression, or NULL to apply
2003 the standard conversion rules. */
2007 tree, (tree type, tree expr),
2008 hook_tree_tree_tree_null)
2010 /* Return the array of IRA cover classes for the current target. */
2014 const reg_class_t *, (void),
2015 default_ira_cover_classes)
2017 /* Return the class for a secondary reload, and fill in extra information. */
2022 (bool in_p, rtx x, reg_class_t reload_class, enum machine_mode reload_mode,
2023 secondary_reload_info *sri),
2024 default_secondary_reload)
2027 (class_likely_spilled_p,
2029 bool, (reg_class_t rclass),
2030 default_class_likely_spilled_p)
2032 /* This target hook allows the backend to perform additional
2033 processing while initializing for variable expansion. */
2035 (expand_to_rtl_hook,
2040 /* This target hook allows the backend to perform additional
2041 instantiations on rtx that are not actually in insns yet,
2042 but will be later. */
2049 /* Return true if is OK to use a hard register REGNO as scratch register
2052 (hard_regno_scratch_ok,
2054 bool, (unsigned int regno),
2055 default_hard_regno_scratch_ok)
2057 /* Return the smallest number of different values for which it is best to
2058 use a jump-table instead of a tree of conditional branches. */
2060 (case_values_threshold,
2062 unsigned int, (void),
2063 default_case_values_threshold)
2065 /* Retutn true if a function must have and use a frame pointer. */
2067 (frame_pointer_required,
2070 hook_bool_void_false)
2072 /* Returns true if the compiler is allowed to try to replace register number
2073 from-reg with register number to-reg. */
2077 bool, (const int from_reg, const int to_reg),
2078 hook_bool_const_int_const_int_true)
2080 /* Functions specific to the C family of frontends. */
2082 #define HOOK_PREFIX "TARGET_C_"
2083 HOOK_VECTOR (TARGET_C, c)
2085 /* ??? Documenting this hook requires a GFDL license grant. */
2088 "Return machine mode for non-standard constant literal suffix @var{c},\
2089 or VOIDmode if non-standard suffixes are unsupported.",
2090 enum machine_mode, (char c),
2091 default_mode_for_suffix)
2095 /* Functions specific to the C++ frontend. */
2097 #define HOOK_PREFIX "TARGET_CXX_"
2098 HOOK_VECTOR (TARGET_CXX, cxx)
2100 /* Return the integer type used for guard variables. */
2105 default_cxx_guard_type)
2107 /* Return true if only the low bit of the guard should be tested. */
2112 hook_bool_void_false)
2114 /* Returns the size of the array cookie for an array of type. */
2119 default_cxx_get_cookie_size)
2121 /* Returns true if the element size should be stored in the array cookie. */
2126 hook_bool_void_false)
2128 /* Allows backends to perform additional processing when
2129 deciding if a class should be exported or imported. */
2131 (import_export_class,
2133 int, (tree type, int import_export), NULL)
2135 /* Returns true if constructors and destructors return "this". */
2137 (cdtor_returns_this,
2140 hook_bool_void_false)
2142 /* Returns true if the key method for a class can be an inline
2143 function, so long as it is not declared inline in the class
2144 itself. Returning true is the behavior required by the Itanium C++ ABI. */
2146 (key_method_may_be_inline,
2149 hook_bool_void_true)
2152 (determine_class_data_visibility,
2153 "@var{decl} is a virtual table, virtual table table, typeinfo object,\
2154 or other similar implicit class data object that will be emitted with\
2155 external linkage in this translation unit. No ELF visibility has been\
2156 explicitly specified. If the target needs to specify a visibility\
2157 other than that of the containing class, use this hook to set\
2158 @code{DECL_VISIBILITY} and @code{DECL_VISIBILITY_SPECIFIED}.",
2162 /* Returns true (the default) if virtual tables and other
2163 similar implicit class data objects are always COMDAT if they
2164 have external linkage. If this hook returns false, then
2165 class data for classes whose virtual table will be emitted in
2166 only one translation unit will not be COMDAT. */
2168 (class_data_always_comdat,
2171 hook_bool_void_true)
2173 /* Returns true (the default) if the RTTI for the basic types,
2174 which is always defined in the C++ runtime, should be COMDAT;
2175 false if it should not be COMDAT. */
2177 (library_rtti_comdat,
2180 hook_bool_void_true)
2182 /* Returns true if __aeabi_atexit should be used to register static
2188 hook_bool_void_false)
2190 /* Returns true if target may use atexit in the same manner as
2191 __cxa_atexit to register static destructors. */
2193 (use_atexit_for_cxa_atexit,
2196 hook_bool_void_false)
2199 (adjust_class_at_definition,
2200 "@var{type} is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that has just\
2201 been defined. Use this hook to make adjustments to the class (eg, tweak\
2202 visibility or perform any other required target modifications).",
2206 HOOK_VECTOR_END (cxx)
2208 /* Functions and data for emulated TLS support. */
2210 #define HOOK_PREFIX "TARGET_EMUTLS_"
2211 HOOK_VECTOR (TARGET_EMUTLS, emutls)
2213 /* Name of the address and common functions. */
2217 const char *, "__builtin___emutls_get_address")
2222 const char *, "__builtin___emutls_register_common")
2224 /* Prefixes for proxy variable and template. */
2235 /* Prefixes for proxy variable and template. */
2246 /* Function to generate field definitions of the proxy variable. */
2250 tree, (tree type, tree *name),
2251 default_emutls_var_fields)
2253 /* Function to initialize a proxy variable. */
2257 tree, (tree var, tree decl, tree tmpl_addr),
2258 default_emutls_var_init)
2260 /* Whether we are allowed to alter the usual alignment of the
2267 /* Whether we can emit debug information for TLS vars. */
2269 (debug_form_tls_address,
2273 HOOK_VECTOR_END (emutls)
2276 #define HOOK_PREFIX "TARGET_OPTION_"
2277 HOOK_VECTOR (TARGET_OPTION_HOOKS, target_option_hooks)
2279 /* Function to validate the attribute((option(...))) strings or NULL. If
2280 the option is validated, it is assumed that DECL_FUNCTION_SPECIFIC will
2281 be filled in in the function decl node. */
2285 bool, (tree fndecl, tree name, tree args, int flags),
2286 default_target_option_valid_attribute_p)
2288 /* Function to save any extra target state in the target options structure. */
2292 void, (struct cl_target_option *ptr), NULL)
2294 /* Function to restore any extra target state from the target options
2299 void, (struct cl_target_option *ptr), NULL)
2301 /* Function to print any extra target state from the target options
2306 void, (FILE *file, int indent, struct cl_target_option *ptr), NULL)
2308 /* Function to parse arguments to be validated for #pragma option, and to
2309 change the state if the options are valid. If the first argument is
2310 NULL, the second argument specifies the default options to use. Return
2311 true if the options are valid, and set the current state. */
2312 /* ??? The documentation in tm.texi is incomplete. */
2316 bool, (tree args, tree pop_target),
2317 default_target_option_pragma_parse)
2319 /* Do option overrides for the target. */
2326 /* Set default optimizations for the target. */
2330 void, (int level, int size),
2333 /* Function to determine if one function can inline another function. */
2335 #define HOOK_PREFIX "TARGET_"
2339 bool, (tree caller, tree callee),
2340 default_target_can_inline_p)
2342 HOOK_VECTOR_END (target_option)
2344 /* For targets that need to mark extra registers as live on entry to
2345 the function, they should define this target hook and set their
2346 bits in the bitmap passed in. */
2348 (extra_live_on_entry,
2350 void, (bitmap regs),
2353 /* Determine the type of unwind info to emit for debugging. */
2357 enum unwind_info_type, (void),
2358 default_debug_unwind_info)
2360 /* Determine the type of unwind info to emit for exceptions. */
2362 (except_unwind_info,
2364 enum unwind_info_type, (void),
2365 default_except_unwind_info)
2367 /* Leave the boolean fields at the end. */
2369 /* True if unwinding tables should be generated by default. */
2371 (unwind_tables_default,
2375 /* True if arbitrary sections are supported. */
2377 (have_named_sections,
2381 /* True if we can create zeroed data by switching to a BSS section
2382 and then using ASM_OUTPUT_SKIP to allocate the space. */
2384 (have_switchable_bss_sections,
2388 /* True if "native" constructors and destructors are supported,
2389 false if we're using collect2 for the job. */
2395 /* True if thread-local storage is supported. */
2401 /* True if a small readonly data section is supported. */
2403 (have_srodata_section,
2407 /* True if EH frame info sections should be zero-terminated. */
2409 (terminate_dw2_eh_frame_info,
2413 /* True if #NO_APP should be emitted at the beginning of assembly output. */
2415 (asm_file_start_app_off,
2419 /* True if output_file_directive should be called for main_input_filename
2420 at the beginning of assembly output. */
2422 (asm_file_start_file_directive,
2427 (handle_pragma_extern_prefix,
2428 "True if @code{#pragma extern_prefix} is to be supported.",
2431 /* True if the target is allowed to reorder memory accesses unless
2432 synchronization is explicitly requested. */
2438 /* Returns true if we should generate exception tables for use with the
2439 ARM EABI. The effects the encoding of function exception specifications. */
2446 (want_debug_pub_sections,
2447 "True if the @code{.debug_pubtypes} and @code{.debug_pubnames} sections\
2448 should be emitted. These sections are not used on most platforms, and\
2449 in particular GDB does not use them.",
2452 /* Leave the boolean fields at the end. */
2454 /* Empty macro arguments are undefined in C90, so use an empty macro. */
2455 #define C90_EMPTY_HACK
2456 /* Close the 'struct gcc_target' definition. */
2457 HOOK_VECTOR_END (C90_EMPTY_HACK)
2459 HOOK_VECTOR (TARGETCM_INITIALIZER, gcc_targetcm)
2461 /* Handle target switch CODE (an OPT_* value). ARG is the argument
2462 passed to the switch; it is NULL if no argument was. VALUE is the
2463 value of ARG if CODE specifies a UInteger option, otherwise it is
2464 1 if the positive form of the switch was used and 0 if the negative
2465 form was. Return true if the switch was valid. */
2469 bool, (size_t code, const char *arg, int value),
2470 default_handle_c_option)
2472 HOOK_VECTOR_END (C90_EMPTY_HACK)