1 /* Target hook definitions.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
4 Free Software Foundation, Inc.
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 3, or (at your option) any
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>.
20 In other words, you are welcome to use, share and improve this program.
21 You are forbidden to forbid anyone else to use, share and improve
22 what you give them. Help stamp out software-hoarding! */
24 /* See target-hooks-macros.h for details of macros that should be
25 provided by the including file, and how to use them here. */
26 #include "target-hooks-macros.h"
29 #define HOOK_TYPE "Target Hook"
31 HOOK_VECTOR (TARGET_INITIALIZER, gcc_target)
33 /* Functions that output assembler for the target. */
34 #define HOOK_PREFIX "TARGET_ASM_"
35 HOOK_VECTOR (TARGET_ASM_OUT, asm_out)
37 /* Opening and closing parentheses for asm expression grouping. */
42 DEFHOOKPODX (close_paren, const char *, ")")
44 /* Assembler instructions for creating various kinds of integer object. */
48 const char *, "\t.byte\t")
49 DEFHOOKPOD (aligned_op, "*", struct asm_int_op, TARGET_ASM_ALIGNED_INT_OP)
50 DEFHOOKPOD (unaligned_op, "*", struct asm_int_op, TARGET_ASM_UNALIGNED_INT_OP)
52 /* The maximum number of bytes to skip when applying
53 LABEL_ALIGN_AFTER_BARRIER. */
55 (label_align_after_barrier_max_skip,
58 default_label_align_after_barrier_max_skip)
60 /* The maximum number of bytes to skip when applying
66 default_loop_align_max_skip)
68 /* The maximum number of bytes to skip when applying
71 (label_align_max_skip,
74 default_label_align_max_skip)
76 /* The maximum number of bytes to skip when applying
82 default_jump_align_max_skip)
84 /* Try to output the assembler code for an integer object whose
85 value is given by X. SIZE is the size of the object in bytes and
86 ALIGNED_P indicates whether it is aligned. Return true if
87 successful. Only handles cases for which BYTE_OP, ALIGNED_OP
88 and UNALIGNED_OP are NULL. */
92 /* Only handles cases for which BYTE_OP, ALIGNED_OP and UNALIGNED_OP are
94 bool, (rtx x, unsigned int size, int aligned_p),
95 default_assemble_integer)
97 /* Output code that will globalize a label. */
101 void, (FILE *stream, const char *name),
102 default_globalize_label)
104 /* Output code that will globalize a declaration. */
106 (globalize_decl_name,
108 void, (FILE *stream, tree decl), default_globalize_decl_name)
110 /* Output code that will emit a label for unwind info, if this
111 target requires such labels. Second argument is the decl the
112 unwind info is associated with, third is a boolean: true if
113 this is for exception handling, fourth is a boolean: true if
114 this is only a placeholder for an omitted FDE. */
118 void, (FILE *stream, tree decl, int for_eh, int empty),
119 default_emit_unwind_label)
121 /* Output code that will emit a label to divide up the exception table. */
123 (emit_except_table_label,
125 void, (FILE *stream),
126 default_emit_except_table_label)
128 /* Emit a directive for setting the personality for the function. */
130 (emit_except_personality,
131 "If the target implements @code{TARGET_ASM_UNWIND_EMIT}, this hook may be\
132 used to emit a directive to install a personality hook into the unwind\
133 info. This hook should not be used if dwarf2 unwind info is used.",
134 void, (rtx personality),
137 /* Emit any directives required to unwind this instruction. */
141 void, (FILE *stream, rtx insn),
145 (unwind_emit_before_insn,
146 "True if the @code{TARGET_ASM_UNWIND_EMIT} hook should be called before\
147 the assembly for @var{insn} has been emitted, false if the hook should\
148 be called afterward.",
151 /* Generate an internal label.
152 For now this is just a wrapper for ASM_GENERATE_INTERNAL_LABEL. */
154 (generate_internal_label,
156 void, (char *buf, const char *prefix, unsigned long labelno),
157 default_generate_internal_label)
159 /* Output an internal label. */
163 void, (FILE *stream, const char *prefix, unsigned long labelno),
164 default_internal_label)
166 /* Output label for the constant. */
168 (declare_constant_name,
170 void, (FILE *file, const char *name, const_tree expr, HOST_WIDE_INT size),
171 default_asm_declare_constant_name)
173 /* Emit a ttype table reference to a typeinfo object. */
180 /* Emit an assembler directive to set visibility for the symbol
181 associated with the tree decl. */
183 (assemble_visibility,
185 void, (tree decl, int visibility),
186 default_assemble_visibility)
188 /* Output the assembler code for entry to a function. */
192 void, (FILE *file, HOST_WIDE_INT size),
193 default_function_pro_epilogue)
195 /* Output the assembler code for end of prologue. */
197 (function_end_prologue,
202 /* Output the assembler code for start of epilogue. */
204 (function_begin_epilogue,
209 /* Output the assembler code for function exit. */
213 void, (FILE *file, HOST_WIDE_INT size),
214 default_function_pro_epilogue)
216 /* Initialize target-specific sections. */
223 /* Tell assembler to change to section NAME with attributes FLAGS.
224 If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with
225 which this section is associated. */
229 void, (const char *name, unsigned int flags, tree decl),
230 default_no_named_section)
232 /* Return preferred text (sub)section for function DECL.
233 Main purpose of this function is to separate cold, normal and hot
234 functions. STARTUP is true when function is known to be used only
235 at startup (from static constructors or it is main()).
236 EXIT is true when function is known to be used only at exit
237 (from static destructors).
238 Return NULL if function should go to default text section. */
242 section *, (tree decl, enum node_frequency freq, bool startup, bool exit),
243 default_function_section)
245 /* Output the assembler code for function exit. */
247 (function_switched_text_sections,
248 "Used by the target to emit any assembler directives or additional\
249 labels needed when a function is partitioned between different\
250 sections. Output should be written to @var{file}. The function\
251 decl is available as @var{decl} and the new section is `cold' if\
252 @var{new_is_cold} is @code{true}.",
253 void, (FILE *file, tree decl, bool new_is_cold),
254 default_function_switched_text_sections)
256 /* Return a mask describing how relocations should be treated when
257 selecting sections. Bit 1 should be set if global relocations
258 should be placed in a read-write section; bit 0 should be set if
259 local relocations should be placed in a read-write section. */
264 default_reloc_rw_mask)
266 /* Return a section for EXP. It may be a DECL or a constant. RELOC
267 is nonzero if runtime relocations must be applied; bit 1 will be
268 set if the runtime relocations require non-local name resolution.
269 ALIGN is the required alignment of the data. */
273 section *, (tree exp, int reloc, unsigned HOST_WIDE_INT align),
274 default_select_section)
276 /* Return a section for X. MODE is X's mode and ALIGN is its
277 alignment in bits. */
281 section *, (enum machine_mode mode, rtx x, unsigned HOST_WIDE_INT align),
282 default_select_rtx_section)
284 /* Select a unique section name for DECL. RELOC is the same as
285 for SELECT_SECTION. */
289 void, (tree decl, int reloc),
290 default_unique_section)
292 /* Return the readonly data section associated with function DECL. */
294 (function_rodata_section,
296 section *, (tree decl),
297 default_function_rodata_section)
299 /* Nonnull if the target wants to override the default ".rodata" prefix
300 for mergeable data sections. */
302 (mergeable_rodata_prefix,
303 "Usually, the compiler uses the prefix @code{\".rodata\"} to construct\n\
304 section names for mergeable constant data. Define this macro to override\n\
305 the string if a different section name should be used.",
306 const char *, ".rodata")
308 /* Output a constructor for a symbol with a given priority. */
312 void, (rtx symbol, int priority), NULL)
314 /* Output a destructor for a symbol with a given priority. */
318 void, (rtx symbol, int priority), NULL)
320 /* Output the assembler code for a thunk function. THUNK_DECL is the
321 declaration for the thunk function itself, FUNCTION is the decl for
322 the target function. DELTA is an immediate constant offset to be
323 added to THIS. If VCALL_OFFSET is nonzero, the word at
324 *(*this + vcall_offset) should be added to THIS. */
328 void, (FILE *file, tree thunk_fndecl, HOST_WIDE_INT delta,
329 HOST_WIDE_INT vcall_offset, tree function),
332 /* Determine whether output_mi_thunk would succeed. */
333 /* ??? Ideally, this hook would not exist, and success or failure
334 would be returned from output_mi_thunk directly. But there's
335 too much undo-able setup involved in invoking output_mi_thunk.
336 Could be fixed by making output_mi_thunk emit rtl instead of
337 text to the output file. */
339 (can_output_mi_thunk,
341 bool, (const_tree thunk_fndecl, HOST_WIDE_INT delta,
342 HOST_WIDE_INT vcall_offset, const_tree function),
343 hook_bool_const_tree_hwi_hwi_const_tree_false)
345 /* Output any boilerplate text needed at the beginning of a
353 /* Output any boilerplate text needed at the end of a translation unit. */
360 /* Output any boilerplate text needed at the beginning of an
361 LTO output stream. */
368 /* Output any boilerplate text needed at the end of an
369 LTO output stream. */
376 /* Output any boilerplace text needed at the end of a
377 translation unit before debug and unwind info is emitted. */
384 /* Output an assembler pseudo-op to declare a library function name
390 default_external_libcall)
392 /* Output an assembler directive to mark decl live. This instructs
393 linker to not dead code strip this symbol. */
395 (mark_decl_preserved,
397 void, (const char *symbol),
398 hook_void_constcharptr)
400 /* Output a record of the command line switches that have been passed. */
402 (record_gcc_switches,
404 int, (print_switch_type type, const char *text),
407 /* The name of the section that the example ELF implementation of
408 record_gcc_switches will use to store the information. Target
409 specific versions of record_gcc_switches may or may not use
412 (record_gcc_switches_section,
414 const char *, ".GCC.command.line")
416 /* Output the definition of a section anchor. */
421 default_asm_output_anchor)
423 /* Output a DTP-relative reference to a TLS symbol. */
425 (output_dwarf_dtprel,
427 void, (FILE *file, int size, rtx x),
430 /* Some target machines need to postscan each insn after it is output. */
432 (final_postscan_insn,
434 void, (FILE *file, rtx insn, rtx *opvec, int noperands),
437 /* Emit the trampoline template. This hook may be NULL. */
439 (trampoline_template,
445 (output_source_filename,
446 "Output COFF information or DWARF debugging information which indicates\
447 that filename @var{name} is the current source file to the stdio\
448 stream @var{file}.\n\
450 This target hook need not be defined if the standard form of output\
451 for the file format in use is appropriate.",
452 void ,(FILE *file, const char *name),
453 default_asm_output_source_filename)
456 (output_addr_const_extra,
458 bool, (FILE *file, rtx x),
459 default_asm_output_addr_const_extra)
461 /* ??? The TARGET_PRINT_OPERAND* hooks are part of the asm_out struct,
462 even though that is not reflected in the macro name to override their
465 #define HOOK_PREFIX "TARGET_"
467 /* Emit a machine-specific insn operand. */
468 /* ??? tm.texi only documents the old macro PRINT_OPERAND,
469 not this hook, and uses a different name for the argument FILE. */
473 void, (FILE *file, rtx x, int code),
474 default_print_operand)
476 /* Emit a machine-specific memory address. */
477 /* ??? tm.texi only documents the old macro PRINT_OPERAND_ADDRESS,
478 not this hook, and uses different argument names. */
480 (print_operand_address,
482 void, (FILE *file, rtx addr),
483 default_print_operand_address)
485 /* Determine whether CODE is a valid punctuation character for the
486 `print_operand' hook. */
487 /* ??? tm.texi only documents the old macro PRINT_OPERAND_PUNCT_VALID_P,
490 (print_operand_punct_valid_p,
492 bool ,(unsigned char code),
493 default_print_operand_punct_valid_p)
495 /* Given a symbol name, perform same mangling as assemble_name and
496 ASM_OUTPUT_LABELREF, returning result as an IDENTIFIER_NODE. */
498 (mangle_assembler_name,
499 "Given a symbol @var{name}, perform same mangling as @code{varasm.c}'s\
500 @code{assemble_name}, but in memory rather than to a file stream, returning\
501 result as an @code{IDENTIFIER_NODE}. Required for correct LTO symtabs. The\
502 default implementation calls the @code{TARGET_STRIP_NAME_ENCODING} hook and\
503 then prepends the @code{USER_LABEL_PREFIX}, if any.",
504 tree, (const char *name),
505 default_mangle_assembler_name)
507 HOOK_VECTOR_END (asm_out)
509 /* Functions relating to instruction scheduling. All of these
510 default to null pointers, which haifa-sched.c looks for and handles. */
512 #define HOOK_PREFIX "TARGET_SCHED_"
513 HOOK_VECTOR (TARGET_SCHED, sched)
515 /* Given the current cost, COST, of an insn, INSN, calculate and
516 return a new cost based on its relationship to DEP_INSN through
517 the dependence LINK. The default is to make no adjustment. */
521 int, (rtx insn, rtx link, rtx dep_insn, int cost), NULL)
523 /* Adjust the priority of an insn as you see fit. Returns the new priority. */
527 int, (rtx insn, int priority), NULL)
529 /* Function which returns the maximum number of insns that can be
530 scheduled in the same machine cycle. This must be constant
531 over an entire compilation. The default is 1. */
537 /* Calculate how much this insn affects how many more insns we
538 can emit this cycle. Default is they all cost the same. */
542 int, (FILE *file, int verbose, rtx insn, int more), NULL)
544 /* Initialize machine-dependent scheduling code. */
548 void, (FILE *file, int verbose, int max_ready), NULL)
550 /* Finalize machine-dependent scheduling code. */
554 void, (FILE *file, int verbose), NULL)
556 /* Initialize machine-dependent function wide scheduling code. */
560 void, (FILE *file, int verbose, int old_max_uid), NULL)
562 /* Finalize machine-dependent function wide scheduling code. */
566 void, (FILE *file, int verbose), NULL)
568 /* Reorder insns in a machine-dependent fashion, in two different
569 places. Default does nothing. */
573 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
578 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
580 /* The following member value is a pointer to a function called
581 after evaluation forward dependencies of insns in chain given
582 by two parameter values (head and tail correspondingly). */
584 (dependencies_evaluation_hook,
586 void, (rtx head, rtx tail), NULL)
588 /* The values of the following four members are pointers to functions
589 used to simplify the automaton descriptions. dfa_pre_cycle_insn and
590 dfa_post_cycle_insn give functions returning insns which are used to
591 change the pipeline hazard recognizer state when the new simulated
592 processor cycle correspondingly starts and finishes. The function
593 defined by init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are
594 used to initialize the corresponding insns. The default values of
595 the members result in not changing the automaton state when the
596 new simulated processor cycle correspondingly starts and finishes. */
599 (init_dfa_pre_cycle_insn,
609 (init_dfa_post_cycle_insn,
614 (dfa_post_cycle_insn,
618 /* The values of the following two members are pointers to
619 functions used to simplify the automaton descriptions.
620 dfa_pre_advance_cycle and dfa_post_advance_cycle are getting called
621 immediately before and after cycle is advanced. */
624 (dfa_pre_advance_cycle,
629 (dfa_post_advance_cycle,
633 /* The following member value is a pointer to a function returning value
634 which defines how many insns in queue `ready' will we try for
635 multi-pass scheduling. If the member value is nonzero and the
636 function returns positive value, the DFA based scheduler will make
637 multi-pass scheduling for the first cycle. In other words, we will
638 try to choose ready insn which permits to start maximum number of
639 insns on the same cycle. */
641 (first_cycle_multipass_dfa_lookahead,
645 /* The following member value is pointer to a function controlling
646 what insns from the ready insn queue will be considered for the
647 multipass insn scheduling. If the hook returns zero for insn
648 passed as the parameter, the insn will be not chosen to be issued. */
650 (first_cycle_multipass_dfa_lookahead_guard,
652 int, (rtx insn), NULL)
654 /* This hook prepares the target for a new round of multipass
656 DATA is a pointer to target-specific data used for multipass scheduling.
657 READY_TRY and N_READY represent the current state of search in the
658 optimization space. The target can filter out instructions that
659 should not be tried during current round by setting corresponding
660 elements in READY_TRY to non-zero.
661 FIRST_CYCLE_INSN_P is true if this is the first round of multipass
662 scheduling on current cycle. */
664 (first_cycle_multipass_begin,
666 void, (void *data, char *ready_try, int n_ready, bool first_cycle_insn_p),
669 /* This hook is called when multipass scheduling evaluates instruction INSN.
670 DATA is a pointer to target-specific data that can be used to record effects
671 of INSN on CPU that are not described in DFA.
672 READY_TRY and N_READY represent the current state of search in the
673 optimization space. The target can filter out instructions that
674 should not be tried after issueing INSN by setting corresponding
675 elements in READY_TRY to non-zero.
676 INSN is the instruction being evaluated.
677 PREV_DATA is a pointer to target-specific data corresponding
678 to a state before issueing INSN. */
680 (first_cycle_multipass_issue,
682 void, (void *data, char *ready_try, int n_ready, rtx insn,
683 const void *prev_data), NULL)
685 /* This hook is called when multipass scheduling backtracks from evaluation of
686 instruction corresponding to DATA.
687 DATA is a pointer to target-specific data that stores the effects
688 of instruction from which the algorithm backtracks on CPU that are not
690 READY_TRY and N_READY represent the current state of search in the
691 optimization space. The target can filter out instructions that
692 should not be tried after issueing INSN by setting corresponding
693 elements in READY_TRY to non-zero. */
695 (first_cycle_multipass_backtrack,
697 void, (const void *data, char *ready_try, int n_ready), NULL)
699 /* This hook notifies the target about the result of the concluded current
700 round of multipass scheduling.
702 If DATA is non-NULL it points to target-specific data used for multipass
703 scheduling which corresponds to instruction at the start of the chain of
704 the winning solution. DATA is NULL when multipass scheduling cannot find
705 a good enough solution on current cycle and decides to retry later,
706 usually after advancing the cycle count. */
708 (first_cycle_multipass_end,
710 void, (const void *data), NULL)
712 /* This hook is called to initialize target-specific data for multipass
713 scheduling after it has been allocated.
714 DATA is a pointer to target-specific data that stores the effects
715 of instruction from which the algorithm backtracks on CPU that are not
718 (first_cycle_multipass_init,
720 void, (void *data), NULL)
722 /* This hook is called to finalize target-specific data for multipass
723 scheduling before it is deallocated.
724 DATA is a pointer to target-specific data that stores the effects
725 of instruction from which the algorithm backtracks on CPU that are not
728 (first_cycle_multipass_fini,
730 void, (void *data), NULL)
732 /* The following member value is pointer to a function called by
733 the insn scheduler before issuing insn passed as the third
734 parameter on given cycle. If the hook returns nonzero, the
735 insn is not issued on given processors cycle. Instead of that,
736 the processor cycle is advanced. If the value passed through
737 the last parameter is zero, the insn ready queue is not sorted
738 on the new cycle start as usually. The first parameter passes
739 file for debugging output. The second one passes the scheduler
740 verbose level of the debugging output. The forth and the fifth
741 parameter values are correspondingly processor cycle on which
742 the previous insn has been issued and the current processor cycle. */
746 int, (FILE *dump, int verbose, rtx insn, int last_clock,
747 int clock, int *sort_p),
750 /* The following member value is a pointer to a function called by the
751 insn scheduler. It should return true if there exists a dependence
752 which is considered costly by the target, between the insn
753 DEP_PRO (&_DEP), and the insn DEP_CON (&_DEP). The first parameter is
754 the dep that represents the dependence between the two insns. The
755 second argument is the cost of the dependence as estimated by
756 the scheduler. The last argument is the distance in cycles
757 between the already scheduled insn (first parameter) and the
758 second insn (second parameter). */
760 (is_costly_dependence,
762 bool, (struct _dep *_dep, int cost, int distance), NULL)
766 "Given the current cost, @var{cost}, of an insn, @var{insn}, calculate and\
767 return a new cost based on its relationship to @var{dep_insn} through the\
768 dependence of weakness @var{dw}. The default is to make no adjustment.",
769 int, (rtx insn, int dep_type1, rtx dep_insn, int cost, int dw), NULL)
771 /* The following member value is a pointer to a function called
772 by the insn scheduler. This hook is called to notify the backend
773 that new instructions were emitted. */
779 /* Next 5 functions are for multi-point scheduling. */
781 /* Allocate memory for scheduler context. */
783 (alloc_sched_context,
785 void *, (void), NULL)
787 /* Fills the context from the local machine scheduler context. */
791 void, (void *tc, bool clean_p), NULL)
793 /* Sets local machine scheduler context to a saved value. */
797 void, (void *tc), NULL)
799 /* Clears a scheduler context so it becomes like after init. */
801 (clear_sched_context,
803 void, (void *tc), NULL)
805 /* Frees the scheduler context. */
809 void, (void *tc), NULL)
811 /* The following member value is a pointer to a function called
812 by the insn scheduler.
813 The first parameter is an instruction, the second parameter is the type
814 of the requested speculation, and the third parameter is a pointer to the
815 speculative pattern of the corresponding type (set if return value == 1).
817 -1, if there is no pattern, that will satisfy the requested speculation type,
818 0, if current pattern satisfies the requested speculation type,
819 1, if pattern of the instruction should be changed to the newly
824 int, (rtx insn, int request, rtx *new_pat), NULL)
826 /* The following member value is a pointer to a function called
827 by the insn scheduler. It should return true if the check instruction
828 passed as the parameter needs a recovery block. */
832 bool, (int dep_status), NULL)
834 /* The following member value is a pointer to a function called
835 by the insn scheduler. It should return a pattern for the check
837 The first parameter is a speculative instruction, the second parameter
838 is the label of the corresponding recovery block (or null, if it is a
839 simple check). If the mutation of the check is requested (e.g. from
840 ld.c to chk.a), the third parameter is true - in this case the first
841 parameter is the previous check. */
845 rtx, (rtx insn, rtx label, int mutate_p), NULL)
847 /* The following member value is a pointer to a function controlling
848 what insns from the ready insn queue will be considered for the
849 multipass insn scheduling. If the hook returns zero for the insn
850 passed as the parameter, the insn will not be chosen to be
851 issued. This hook is used to discard speculative instructions,
852 that stand at the first position of the ready list. */
854 (first_cycle_multipass_dfa_lookahead_guard_spec,
856 bool, (const_rtx insn), NULL)
858 /* The following member value is a pointer to a function that provides
859 information about the speculation capabilities of the target.
860 The parameter is a pointer to spec_info variable. */
864 void, (struct spec_info_def *spec_info), NULL)
868 "Return speculation types of instruction @var{insn}.",
869 int, (rtx insn), NULL)
872 (get_insn_checked_ds,
873 "Return speculation types that are checked for instruction @var{insn}",
874 int, (rtx insn), NULL)
878 "Return bool if rtx scanning should just skip current layer and\
879 advance to the inner rtxes.",
880 bool, (const_rtx x), NULL)
882 /* The following member value is a pointer to a function that provides
883 information about the target resource-based lower bound which is
884 used by the swing modulo scheduler. The parameter is a pointer
889 int, (struct ddg *g), NULL)
891 /* The following member value is a function that initializes dispatch
892 schedling and adds instructions to dispatch window according to its
897 void, (rtx insn, int x),
900 /* The following member value is a a function that returns true is
901 dispatch schedling is supported in hardware and condition passed
902 as the second parameter is true. */
906 bool, (rtx insn, int x),
907 hook_bool_rtx_int_false)
911 "True if the processor has an exposed pipeline, which means that not just\n\
912 the order of instructions is important for correctness when scheduling, but\n\
913 also the latencies of operations.",
916 HOOK_VECTOR_END (sched)
918 /* Functions relating to vectorization. */
920 #define HOOK_PREFIX "TARGET_VECTORIZE_"
921 HOOK_VECTOR (TARGET_VECTORIZE, vectorize)
923 /* The following member value is a pointer to a function called
924 by the vectorizer, and return the decl of the target builtin
927 (builtin_mask_for_load,
931 /* Returns a code for builtin that realizes vectorized version of
932 function, or NULL_TREE if not available. */
934 (builtin_vectorized_function,
936 tree, (tree fndecl, tree vec_type_out, tree vec_type_in),
937 default_builtin_vectorized_function)
939 /* Returns a function declaration for a builtin that realizes the
940 vector conversion, or NULL_TREE if not available. */
944 tree, (unsigned code, tree dest_type, tree src_type),
945 default_builtin_vectorized_conversion)
947 /* Target builtin that implements vector widening multiplication.
948 builtin_mul_widen_eve computes the element-by-element products
949 for the even elements, and builtin_mul_widen_odd computes the
950 element-by-element products for the odd elements. */
952 (builtin_mul_widen_even,
954 tree, (tree x), NULL)
957 (builtin_mul_widen_odd,
959 tree, (tree x), NULL)
961 /* Cost of different vector/scalar statements in vectorization cost
962 model. In case of misaligned vector loads and stores the cost depends
963 on the data type and misalignment value. */
965 (builtin_vectorization_cost,
967 int, (enum vect_cost_for_stmt type_of_cost, tree vectype, int misalign),
968 default_builtin_vectorization_cost)
970 /* Return true if vector alignment is reachable (by peeling N
971 iterations) for the given type. */
973 (vector_alignment_reachable,
975 bool, (const_tree type, bool is_packed),
976 default_builtin_vector_alignment_reachable)
978 /* Target builtin that implements vector permute. */
982 tree, (tree type, tree *mask_element_type), NULL)
984 /* Return true if a vector created for builtin_vec_perm is valid. */
986 (builtin_vec_perm_ok,
988 bool, (tree vec_type, tree mask),
989 hook_bool_tree_tree_true)
991 /* Return true if the target supports misaligned store/load of a
992 specific factor denoted in the third parameter. The last parameter
993 is true if the access is defined in a packed struct. */
995 (support_vector_misalignment,
998 (enum machine_mode mode, const_tree type, int misalignment, bool is_packed),
999 default_builtin_support_vector_misalignment)
1001 /* Returns the preferred mode for SIMD operations for the specified
1004 (preferred_simd_mode,
1007 (enum machine_mode mode),
1008 default_preferred_simd_mode)
1010 /* Returns a mask of vector sizes to iterate over when auto-vectorizing
1011 after processing the preferred one derived from preferred_simd_mode. */
1013 (autovectorize_vector_sizes,
1017 default_autovectorize_vector_sizes)
1019 HOOK_VECTOR_END (vectorize)
1022 #define HOOK_PREFIX "TARGET_"
1024 /* Allow target specific overriding of option settings after options have
1025 been changed by an attribute or pragma or when it is reset at the
1026 end of the code affected by an attribute or pragma. */
1028 (override_options_after_change,
1034 (eh_return_filter_mode,
1035 "Return machine mode for filter value.",
1036 enum machine_mode, (void),
1037 default_eh_return_filter_mode)
1039 /* Return machine mode for libgcc expanded cmp instructions. */
1041 (libgcc_cmp_return_mode,
1043 enum machine_mode, (void),
1044 default_libgcc_cmp_return_mode)
1046 /* Return machine mode for libgcc expanded shift instructions. */
1048 (libgcc_shift_count_mode,
1050 enum machine_mode, (void),
1051 default_libgcc_shift_count_mode)
1053 /* Return machine mode to be used for _Unwind_Word type. */
1057 enum machine_mode, (void),
1058 default_unwind_word_mode)
1060 /* Given two decls, merge their attributes and return the result. */
1062 (merge_decl_attributes,
1064 tree, (tree olddecl, tree newdecl),
1065 merge_decl_attributes)
1067 /* Given two types, merge their attributes and return the result. */
1069 (merge_type_attributes,
1071 tree, (tree type1, tree type2),
1072 merge_type_attributes)
1074 /* Table of machine attributes and functions to handle them.
1079 const struct attribute_spec *, NULL)
1081 /* Return true iff attribute NAME expects a plain identifier as its first
1084 (attribute_takes_identifier_p,
1086 bool, (const_tree name),
1087 hook_bool_const_tree_false)
1089 /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
1090 one if they are compatible and two if they are nearly compatible
1091 (which causes a warning to be generated). */
1093 (comp_type_attributes,
1095 int, (const_tree type1, const_tree type2),
1096 hook_int_const_tree_const_tree_1)
1098 /* Assign default attributes to the newly defined TYPE. */
1100 (set_default_type_attributes,
1105 /* Insert attributes on the newly created DECL. */
1109 void, (tree node, tree *attr_ptr),
1110 hook_void_tree_treeptr)
1112 /* Return true if FNDECL (which has at least one machine attribute)
1113 can be inlined despite its machine attributes, false otherwise. */
1115 (function_attribute_inlinable_p,
1117 bool, (const_tree fndecl),
1118 hook_bool_const_tree_false)
1120 /* Return true if bitfields in RECORD_TYPE should follow the
1121 Microsoft Visual C++ bitfield layout rules. */
1123 (ms_bitfield_layout_p,
1125 bool, (const_tree record_type),
1126 hook_bool_const_tree_false)
1128 /* For now this is only an interface to WORDS_BIG_ENDIAN for
1129 target-independent code like the front ends, need performance testing
1130 before switching completely to the target hook. */
1135 targhook_words_big_endian)
1137 /* Likewise for FLOAT_WORDS_BIG_ENDIAN. */
1139 (float_words_big_endian,
1142 targhook_float_words_big_endian)
1144 /* True if the target supports decimal floating point. */
1146 (decimal_float_supported_p,
1149 default_decimal_float_supported_p)
1151 /* True if the target supports fixed-point. */
1153 (fixed_point_supported_p,
1156 default_fixed_point_supported_p)
1158 /* Return true if anonymous bitfields affect structure alignment. */
1160 (align_anon_bitfield,
1163 hook_bool_void_false)
1165 /* Return true if volatile bitfields should use the narrowest type possible.
1166 Return false if they should use the container type. */
1168 (narrow_volatile_bitfield,
1171 hook_bool_void_false)
1173 /* Set up target-specific built-in functions. */
1180 /* Initialize (if INITIALIZE_P is true) and return the target-specific
1181 built-in function decl for CODE.
1182 Return NULL if that is not possible. Return error_mark_node if CODE
1183 is outside of the range of valid target builtin function codes. */
1187 tree, (unsigned code, bool initialize_p), NULL)
1189 /* Expand a target-specific builtin. */
1194 (tree exp, rtx target, rtx subtarget, enum machine_mode mode, int ignore),
1195 default_expand_builtin)
1197 /* Select a replacement for a target-specific builtin. This is done
1198 *before* regular type checking, and so allows the target to
1199 implement a crude form of function overloading. The result is a
1200 complete expression that implements the operation. PARAMS really
1201 has type VEC(tree,gc)*, but we don't want to include tree.h here. */
1203 (resolve_overloaded_builtin,
1205 tree, (unsigned int /*location_t*/ loc, tree fndecl, void *arglist), NULL)
1207 /* Fold a target-specific builtin. */
1211 tree, (tree fndecl, int n_args, tree *argp, bool ignore),
1212 hook_tree_tree_int_treep_bool_null)
1214 /* Returns a code for a target-specific builtin that implements
1215 reciprocal of the function, or NULL_TREE if not available. */
1217 (builtin_reciprocal,
1219 tree, (unsigned fn, bool md_fn, bool sqrt),
1220 default_builtin_reciprocal)
1222 /* For a vendor-specific TYPE, return a pointer to a statically-allocated
1223 string containing the C++ mangling for TYPE. In all other cases, return
1228 const char *, (const_tree type),
1229 hook_constcharptr_const_tree_null)
1231 /* Make any adjustments to libfunc names needed for this target. */
1238 /* Add a __gnu_ prefix to library functions rather than just __. */
1240 (libfunc_gnu_prefix,
1241 "If false (the default), internal library routines start with two\n\
1242 underscores. If set to true, these routines start with @code{__gnu_}\n\
1243 instead. E.g., @code{__muldi3} changes to @code{__gnu_muldi3}. This\n\
1244 currently only affects functions defined in @file{libgcc2.c}. If this\n\
1245 is set to true, the @file{tm.h} file must also\n\
1246 @code{#define LIBGCC2_GNU_PREFIX}.",
1249 /* Given a decl, a section name, and whether the decl initializer
1250 has relocs, choose attributes for the section. */
1251 /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */
1253 (section_type_flags,
1255 unsigned int, (tree decl, const char *name, int reloc),
1256 default_section_type_flags)
1258 /* True if new jumps cannot be created, to replace existing ones or
1259 not, at the current point in the compilation. */
1261 (cannot_modify_jumps_p,
1264 hook_bool_void_false)
1266 /* Return a register class for which branch target register
1267 optimizations should be applied. */
1269 (branch_target_register_class,
1271 reg_class_t, (void),
1272 default_branch_target_register_class)
1274 /* Return true if branch target register optimizations should include
1275 callee-saved registers that are not already live during the current
1276 function. AFTER_PE_GEN is true if prologues and epilogues have
1277 already been generated. */
1279 (branch_target_register_callee_saved,
1281 bool, (bool after_prologue_epilogue_gen),
1282 hook_bool_bool_false)
1284 /* Return true if the target supports conditional execution. */
1286 (have_conditional_execution,
1289 default_have_conditional_execution)
1291 /* Return a new value for loop unroll size. */
1293 (loop_unroll_adjust,
1295 unsigned, (unsigned nunroll, struct loop *loop),
1298 /* True if X is a legitimate MODE-mode immediate operand. */
1300 (legitimate_constant_p,
1302 bool, (enum machine_mode mode, rtx x),
1303 hook_bool_mode_rtx_true)
1305 /* True if the constant X cannot be placed in the constant pool. */
1307 (cannot_force_const_mem,
1309 bool, (enum machine_mode mode, rtx x),
1310 hook_bool_mode_rtx_false)
1313 (cannot_copy_insn_p,
1314 "True if the insn @var{x} cannot be duplicated.",
1317 /* True if X is considered to be commutative. */
1321 bool, (const_rtx x, int outer_code),
1322 hook_bool_const_rtx_commutative_p)
1324 /* True if ADDR is an address-expression whose effect depends
1325 on the mode of the memory reference it is used in. */
1327 (mode_dependent_address_p,
1329 bool, (const_rtx addr),
1330 default_mode_dependent_address_p)
1332 /* Given an invalid address X for a given machine mode, try machine-specific
1333 ways to make it legitimate. Return X or an invalid address on failure. */
1335 (legitimize_address,
1337 rtx, (rtx x, rtx oldx, enum machine_mode mode),
1338 default_legitimize_address)
1340 /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */
1342 (delegitimize_address,
1345 delegitimize_mem_from_attrs)
1347 /* Given an address RTX, say whether it is valid. */
1349 (legitimate_address_p,
1351 bool, (enum machine_mode mode, rtx x, bool strict),
1352 default_legitimate_address_p)
1354 /* True if the given constant can be put into an object_block. */
1356 (use_blocks_for_constant_p,
1358 bool, (enum machine_mode mode, const_rtx x),
1359 hook_bool_mode_const_rtx_false)
1361 /* The minimum and maximum byte offsets for anchored addresses. */
1372 /* True if section anchors can be used to access the given symbol. */
1374 (use_anchors_for_symbol_p,
1376 bool, (const_rtx x),
1377 default_use_anchors_for_symbol_p)
1379 /* True if it is OK to do sibling call optimization for the specified
1380 call expression EXP. DECL will be the called function, or NULL if
1381 this is an indirect call. */
1383 (function_ok_for_sibcall,
1385 bool, (tree decl, tree exp),
1386 hook_bool_tree_tree_false)
1388 /* Establish appropriate back-end context for processing the function
1389 FNDECL. The argument might be NULL to indicate processing at top
1390 level, outside of any function scope. */
1392 (set_current_function,
1394 void, (tree decl), hook_void_tree)
1396 /* True if EXP should be placed in a "small data" section. */
1400 bool, (const_tree exp),
1401 hook_bool_const_tree_false)
1403 /* True if EXP names an object for which name resolution must resolve
1404 to the current executable or shared library. */
1408 bool, (const_tree exp),
1409 default_binds_local_p)
1411 /* Check if profiling code is before or after prologue. */
1413 (profile_before_prologue,
1414 "It returns true if target wants profile code emitted before prologue.\n\n\
1415 The default version of this hook use the target macro\n\
1416 @code{PROFILE_BEFORE_PROLOGUE}.",
1418 default_profile_before_prologue)
1420 /* Modify and return the identifier of a DECL's external name,
1421 originally identified by ID, as required by the target,
1422 (eg, append @nn to windows32 stdcall function names).
1423 The default is to return ID without modification. */
1425 (mangle_decl_assembler_name,
1427 tree, (tree decl, tree id),
1428 default_mangle_decl_assembler_name)
1430 /* Do something target-specific to record properties of the DECL into
1431 the associated SYMBOL_REF. */
1433 (encode_section_info,
1435 void, (tree decl, rtx rtl, int new_decl_p),
1436 default_encode_section_info)
1438 /* Undo the effects of encode_section_info on the symbol string. */
1440 (strip_name_encoding,
1442 const char *, (const char *name),
1443 default_strip_name_encoding)
1445 /* If shift optabs for MODE are known to always truncate the shift count,
1446 return the mask that they apply. Return 0 otherwise. */
1448 (shift_truncation_mask,
1450 unsigned HOST_WIDE_INT, (enum machine_mode mode),
1451 default_shift_truncation_mask)
1453 /* Return the number of divisions in the given MODE that should be present,
1454 so that it is profitable to turn the division into a multiplication by
1457 (min_divisions_for_recip_mul,
1459 unsigned int, (enum machine_mode mode),
1460 default_min_divisions_for_recip_mul)
1462 /* If the representation of integral MODE is such that values are
1463 always sign-extended to a wider mode MODE_REP then return
1464 SIGN_EXTEND. Return UNKNOWN otherwise. */
1465 /* Note that the return type ought to be RTX_CODE, but that's not
1466 necessarily defined at this point. */
1470 int, (enum machine_mode mode, enum machine_mode rep_mode),
1471 default_mode_rep_extended)
1473 /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */
1475 (valid_pointer_mode,
1477 bool, (enum machine_mode mode),
1478 default_valid_pointer_mode)
1480 /* Disambiguate with errno. */
1482 (ref_may_alias_errno,
1483 "Define this to return nonzero if the memory reference @var{ref}\
1484 may alias with the system C library errno location. The default\
1485 version of this hook assumes the system C library errno location\
1486 is either a declaration of type int or accessed by dereferencing\
1488 bool, (struct ao_ref_s *ref),
1489 default_ref_may_alias_errno)
1491 /* Support for named address spaces. */
1493 #define HOOK_PREFIX "TARGET_ADDR_SPACE_"
1494 HOOK_VECTOR (TARGET_ADDR_SPACE_HOOKS, addr_space)
1496 /* MODE to use for a pointer into another address space. */
1500 enum machine_mode, (addr_space_t address_space),
1501 default_addr_space_pointer_mode)
1503 /* MODE to use for an address in another address space. */
1507 enum machine_mode, (addr_space_t address_space),
1508 default_addr_space_address_mode)
1510 /* True if MODE is valid for a pointer in __attribute__((mode("MODE")))
1511 in another address space. */
1513 (valid_pointer_mode,
1515 bool, (enum machine_mode mode, addr_space_t as),
1516 default_addr_space_valid_pointer_mode)
1518 /* True if an address is a valid memory address to a given named address
1519 space for a given mode. */
1521 (legitimate_address_p,
1523 bool, (enum machine_mode mode, rtx exp, bool strict, addr_space_t as),
1524 default_addr_space_legitimate_address_p)
1526 /* Return an updated address to convert an invalid pointer to a named
1527 address space to a valid one. If NULL_RTX is returned use machine
1528 independent methods to make the address valid. */
1530 (legitimize_address,
1532 rtx, (rtx x, rtx oldx, enum machine_mode mode, addr_space_t as),
1533 default_addr_space_legitimize_address)
1535 /* True if one named address space is a subset of another named address. */
1539 bool, (addr_space_t superset, addr_space_t subset),
1540 default_addr_space_subset_p)
1542 /* Function to convert an rtl expression from one address space to another. */
1546 rtx, (rtx op, tree from_type, tree to_type),
1547 default_addr_space_convert)
1549 HOOK_VECTOR_END (addr_space)
1552 #define HOOK_PREFIX "TARGET_"
1554 /* True if MODE is valid for the target. By "valid", we mean able to
1555 be manipulated in non-trivial ways. In particular, this means all
1556 the arithmetic is supported. */
1558 (scalar_mode_supported_p,
1560 bool, (enum machine_mode mode),
1561 default_scalar_mode_supported_p)
1563 /* Similarly for vector modes. "Supported" here is less strict. At
1564 least some operations are supported; need to check optabs or builtins
1565 for further details. */
1567 (vector_mode_supported_p,
1569 bool, (enum machine_mode mode),
1570 hook_bool_mode_false)
1572 /* True if we should try to use a scalar mode to represent an array,
1573 overriding the usual MAX_FIXED_MODE limit. */
1575 (array_mode_supported_p,
1576 "Return true if GCC should try to use a scalar mode to store an array\n\
1577 of @var{nelems} elements, given that each element has mode @var{mode}.\n\
1578 Returning true here overrides the usual @code{MAX_FIXED_MODE} limit\n\
1579 and allows GCC to use any defined integer mode.\n\
1581 One use of this hook is to support vector load and store operations\n\
1582 that operate on several homogeneous vectors. For example, ARM NEON\n\
1583 has operations like:\n\
1586 int8x8x3_t vld3_s8 (const int8_t *)\n\
1587 @end smallexample\n\
1589 where the return type is defined as:\n\
1592 typedef struct int8x8x3_t\n\
1596 @end smallexample\n\
1598 If this hook allows @code{val} to have a scalar mode, then\n\
1599 @code{int8x8x3_t} can have the same mode. GCC can then store\n\
1600 @code{int8x8x3_t}s in registers rather than forcing them onto the stack.",
1601 bool, (enum machine_mode mode, unsigned HOST_WIDE_INT nelems),
1602 hook_bool_mode_uhwi_false)
1604 /* Compute cost of moving data from a register of class FROM to one of
1607 (register_move_cost,
1609 int, (enum machine_mode mode, reg_class_t from, reg_class_t to),
1610 default_register_move_cost)
1612 /* Compute cost of moving registers to/from memory. */
1613 /* ??? Documenting the argument types for this hook requires a GFDL
1614 license grant. Also, the documentation uses a different name for RCLASS. */
1618 int, (enum machine_mode mode, reg_class_t rclass, bool in),
1619 default_memory_move_cost)
1621 /* True for MODE if the target expects that registers in this mode will
1622 be allocated to registers in a small register class. The compiler is
1623 allowed to use registers explicitly used in the rtl as spill registers
1624 but it should prevent extending the lifetime of these registers. */
1626 (small_register_classes_for_mode_p,
1628 bool, (enum machine_mode mode),
1629 hook_bool_mode_false)
1631 /* Register number for a flags register. Only needs to be defined if the
1632 target is constrainted to use post-reload comparison elimination. */
1635 "If the target has a dedicated flags register, and it needs to use the\
1636 post-reload comparison elimination pass, then this value should be set\
1638 unsigned int, INVALID_REGNUM)
1640 /* Compute a (partial) cost for rtx X. Return true if the complete
1641 cost has been computed, and false if subexpressions should be
1642 scanned. In either case, *TOTAL contains the cost result. */
1643 /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's
1644 not necessarily defined at this point. */
1648 bool, (rtx x, int code, int outer_code, int opno, int *total, bool speed),
1649 hook_bool_rtx_int_int_int_intp_bool_false)
1651 /* Compute the cost of X, used as an address. Never called with
1652 invalid addresses. */
1656 int, (rtx address, bool speed),
1657 default_address_cost)
1659 /* Return where to allocate pseudo for a given hard register initial value. */
1661 (allocate_initial_value,
1663 rtx, (rtx hard_reg), NULL)
1665 /* Return nonzero if evaluating UNSPEC[_VOLATILE] X might cause a trap.
1666 FLAGS has the same meaning as in rtlanal.c: may_trap_p_1. */
1670 int, (const_rtx x, unsigned flags),
1671 default_unspec_may_trap_p)
1673 /* Given a register, this hook should return a parallel of registers
1674 to represent where to find the register pieces. Define this hook
1675 if the register and its mode are represented in Dwarf in
1676 non-contiguous locations, or if the register should be
1677 represented in more than one register in Dwarf. Otherwise, this
1678 hook should return NULL_RTX. */
1680 (dwarf_register_span,
1685 /* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
1686 entries not corresponding directly to registers below
1687 FIRST_PSEUDO_REGISTER, this hook should generate the necessary
1688 code, given the address of the table. */
1690 (init_dwarf_reg_sizes_extra,
1692 void, (tree address),
1695 /* Fetch the fixed register(s) which hold condition codes, for
1696 targets where it makes sense to look for duplicate assignments to
1697 the condition codes. This should return true if there is such a
1698 register, false otherwise. The arguments should be set to the
1699 fixed register numbers. Up to two condition code registers are
1700 supported. If there is only one for this target, the int pointed
1701 at by the second argument should be set to -1. */
1703 (fixed_condition_code_regs,
1705 bool, (unsigned int *p1, unsigned int *p2),
1706 hook_bool_uintp_uintp_false)
1708 /* If two condition code modes are compatible, return a condition
1709 code mode which is compatible with both, such that a comparison
1710 done in the returned mode will work for both of the original
1711 modes. If the condition code modes are not compatible, return
1714 (cc_modes_compatible,
1716 enum machine_mode, (enum machine_mode m1, enum machine_mode m2),
1717 default_cc_modes_compatible)
1719 /* Do machine-dependent code transformations. Called just before
1720 delayed-branch scheduling. */
1722 (machine_dependent_reorg,
1726 /* Create the __builtin_va_list type. */
1728 (build_builtin_va_list,
1731 std_build_builtin_va_list)
1733 /* Enumerate the va list variants. */
1737 int, (int idx, const char **pname, tree *ptree),
1740 /* Get the cfun/fndecl calling abi __builtin_va_list type. */
1744 tree, (tree fndecl),
1747 /* Get the __builtin_va_list type dependent on input type. */
1749 (canonical_va_list_type,
1752 std_canonical_va_list_type)
1754 /* ??? Documenting this hook requires a GFDL license grant. */
1756 (expand_builtin_va_start,
1757 "Expand the @code{__builtin_va_start} builtin.",
1758 void, (tree valist, rtx nextarg), NULL)
1760 /* Gimplifies a VA_ARG_EXPR. */
1762 (gimplify_va_arg_expr,
1764 tree, (tree valist, tree type, gimple_seq *pre_p, gimple_seq *post_p),
1765 std_gimplify_va_arg_expr)
1767 /* Validity-checking routines for PCH files, target-specific.
1768 get_pch_validity returns a pointer to the data to be stored,
1769 and stores the size in its argument. pch_valid_p gets the same
1770 information back and returns NULL if the PCH is valid,
1771 or an error message if not. */
1775 void *, (size_t *sz),
1776 default_get_pch_validity)
1781 const char *, (const void *data, size_t sz),
1782 default_pch_valid_p)
1784 /* If nonnull, this function checks whether a PCH file with the
1785 given set of target flags can be used. It returns NULL if so,
1786 otherwise it returns an error message. */
1788 (check_pch_target_flags,
1790 const char *, (int pch_flags), NULL)
1792 /* True if the compiler should give an enum type only as many
1793 bytes as it takes to represent the range of possible values of
1796 (default_short_enums,
1799 hook_bool_void_false)
1801 /* This target hook returns an rtx that is used to store the address
1802 of the current frame into the built-in setjmp buffer. */
1804 (builtin_setjmp_frame_value,
1807 default_builtin_setjmp_frame_value)
1809 /* This target hook should add STRING_CST trees for any hard regs
1810 the port wishes to automatically clobber for an asm. */
1814 tree, (tree outputs, tree inputs, tree clobbers),
1815 hook_tree_tree_tree_tree_3rd_identity)
1817 /* This target hook allows the backend to specify a calling convention
1818 in the debug information. This function actually returns an
1819 enum dwarf_calling_convention, but because of forward declarations
1820 and not wanting to include dwarf2.h everywhere target.h is included
1821 the function is being declared as an int. */
1823 (dwarf_calling_convention,
1825 int, (const_tree function),
1826 hook_int_const_tree_0)
1828 /* This target hook allows the backend to emit frame-related insns that
1829 contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info
1830 engine will invoke it on insns of the form
1831 (set (reg) (unspec [...] UNSPEC_INDEX))
1833 (set (reg) (unspec_volatile [...] UNSPECV_INDEX))
1834 to let the backend emit the call frame instructions. */
1836 (dwarf_handle_frame_unspec,
1838 void, (const char *label, rtx pattern, int index), NULL)
1840 /* ??? Documenting this hook requires a GFDL license grant. */
1842 (stdarg_optimize_hook,
1843 "Perform architecture specific checking of statements gimplified\
1844 from @code{VA_ARG_EXPR}. @var{stmt} is the statement. Returns true if\
1845 the statement doesn't need to be checked for @code{va_list} references.",
1846 bool, (struct stdarg_info *ai, const_gimple stmt), NULL)
1848 /* This target hook allows the operating system to override the DECL
1849 that represents the external variable that contains the stack
1850 protection guard variable. The type of this DECL is ptr_type_node. */
1852 (stack_protect_guard,
1855 default_stack_protect_guard)
1857 /* This target hook allows the operating system to override the CALL_EXPR
1858 that is invoked when a check vs the guard variable fails. */
1860 (stack_protect_fail,
1863 default_external_stack_protect_fail)
1865 /* Returns NULL if target supports the insn within a doloop block,
1866 otherwise it returns an error message. */
1868 (invalid_within_doloop,
1870 const char *, (const_rtx insn),
1871 default_invalid_within_doloop)
1874 (valid_dllimport_attribute_p,
1875 "@var{decl} is a variable or function with @code{__attribute__((dllimport))}\
1876 specified. Use this hook if the target needs to add extra validation\
1877 checks to @code{handle_dll_attribute}.",
1878 bool, (const_tree decl),
1879 hook_bool_const_tree_true)
1881 /* If non-zero, align constant anchors in CSE to a multiple of this
1886 unsigned HOST_WIDE_INT, 0)
1888 /* Functions relating to calls - argument passing, returns, etc. */
1889 /* Members of struct call have no special macro prefix. */
1890 HOOK_VECTOR (TARGET_CALLS, calls)
1893 (promote_function_mode,
1895 enum machine_mode, (const_tree type, enum machine_mode mode, int *punsignedp,
1896 const_tree funtype, int for_return),
1897 default_promote_function_mode)
1900 (promote_prototypes,
1902 bool, (const_tree fntype),
1903 hook_bool_const_tree_false)
1908 rtx, (tree fndecl, int incoming),
1909 hook_rtx_tree_int_null)
1913 bool, (const_tree type, const_tree fntype),
1914 default_return_in_memory)
1919 bool, (const_tree type),
1920 hook_bool_const_tree_false)
1922 /* Return true if a parameter must be passed by reference. TYPE may
1923 be null if this is a libcall. CA may be null if this query is
1924 from __builtin_va_arg. */
1929 (cumulative_args_t cum, enum machine_mode mode, const_tree type, bool named),
1930 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
1933 (expand_builtin_saveregs,
1936 default_expand_builtin_saveregs)
1938 /* Returns pretend_argument_size. */
1940 (setup_incoming_varargs,
1942 void, (cumulative_args_t args_so_far, enum machine_mode mode, tree type,
1943 int *pretend_args_size, int second_time),
1944 default_setup_incoming_varargs)
1947 (strict_argument_naming,
1949 bool, (cumulative_args_t ca),
1950 hook_bool_CUMULATIVE_ARGS_false)
1952 /* Returns true if we should use
1953 targetm.calls.setup_incoming_varargs() and/or
1954 targetm.calls.strict_argument_naming(). */
1956 (pretend_outgoing_varargs_named,
1958 bool, (cumulative_args_t ca),
1959 default_pretend_outgoing_varargs_named)
1961 /* Given a complex type T, return true if a parameter of type T
1962 should be passed as two scalars. */
1966 bool, (const_tree type), NULL)
1968 /* Return true if type T, mode MODE, may not be passed in registers,
1969 but must be passed on the stack. */
1970 /* ??? This predicate should be applied strictly after pass-by-reference.
1971 Need audit to verify that this is the case. */
1973 (must_pass_in_stack,
1975 bool, (enum machine_mode mode, const_tree type),
1976 must_pass_in_stack_var_size_or_pad)
1978 /* Return true if type TYPE, mode MODE, which is passed by reference,
1979 should have the object copy generated by the callee rather than
1980 the caller. It is never called for TYPE requiring constructors. */
1985 (cumulative_args_t cum, enum machine_mode mode, const_tree type, bool named),
1986 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
1988 /* Return zero for arguments passed entirely on the stack or entirely
1989 in registers. If passed in both, return the number of bytes passed
1990 in registers; the balance is therefore passed on the stack. */
1994 int, (cumulative_args_t cum, enum machine_mode mode, tree type, bool named),
1995 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0)
1997 /* Update the state in CA to advance past an argument in the
1998 argument list. The values MODE, TYPE, and NAMED describe that
2001 (function_arg_advance,
2004 (cumulative_args_t ca, enum machine_mode mode, const_tree type, bool named),
2005 default_function_arg_advance)
2007 /* Return zero if the argument described by the state of CA should
2008 be placed on a stack, or a hard register in which to store the
2009 argument. The values MODE, TYPE, and NAMED describe that
2014 rtx, (cumulative_args_t ca, enum machine_mode mode, const_tree type,
2016 default_function_arg)
2018 /* Likewise, but for machines with register windows. Return the
2019 location where the argument will appear to the callee. */
2021 (function_incoming_arg,
2023 rtx, (cumulative_args_t ca, enum machine_mode mode, const_tree type,
2025 default_function_incoming_arg)
2028 (function_arg_boundary,
2030 unsigned int, (enum machine_mode mode, const_tree type),
2031 default_function_arg_boundary)
2034 (function_arg_round_boundary,
2035 "Normally, the size of an argument is rounded up to @code{PARM_BOUNDARY},\n\
2036 which is the default value for this hook. You can define this hook to\n\
2037 return a different value if an argument size must be rounded to a larger\n\
2039 unsigned int, (enum machine_mode mode, const_tree type),
2040 default_function_arg_round_boundary)
2042 /* Return the diagnostic message string if function without a prototype
2043 is not allowed for this 'val' argument; NULL otherwise. */
2045 (invalid_arg_for_unprototyped_fn,
2047 const char *, (const_tree typelist, const_tree funcdecl, const_tree val),
2048 hook_invalid_arg_for_unprototyped_fn)
2050 /* Return an rtx for the return value location of the function
2051 specified by FN_DECL_OR_TYPE with a return type of RET_TYPE. */
2055 rtx, (const_tree ret_type, const_tree fn_decl_or_type, bool outgoing),
2056 default_function_value)
2058 /* Return the rtx for the result of a libcall of mode MODE,
2059 calling the function FN_NAME. */
2063 rtx, (enum machine_mode mode, const_rtx fun),
2064 default_libcall_value)
2066 /* Return true if REGNO is a possible register number for
2067 a function value as seen by the caller. */
2069 (function_value_regno_p,
2071 bool, (const unsigned int regno),
2072 default_function_value_regno_p)
2074 /* ??? Documenting this hook requires a GFDL license grant. */
2076 (internal_arg_pointer,
2077 "Return an rtx for the argument pointer incoming to the\
2080 default_internal_arg_pointer)
2082 /* Update the current function stack boundary if needed. */
2084 (update_stack_boundary,
2088 /* Handle stack alignment and return an rtx for Dynamic Realign
2089 Argument Pointer if necessary. */
2095 /* Return true if all function parameters should be spilled to the
2098 (allocate_stack_slots_for_args,
2101 hook_bool_void_true)
2103 /* Return an rtx for the static chain for FNDECL. If INCOMING_P is true,
2104 then it should be for the callee; otherwise for the caller. */
2108 rtx, (const_tree fndecl, bool incoming_p),
2109 default_static_chain)
2111 /* Fill in the trampoline at MEM with a call to FNDECL and a
2112 static chain value of CHAIN. */
2116 void, (rtx m_tramp, tree fndecl, rtx static_chain),
2117 default_trampoline_init)
2119 /* Adjust the address of the trampoline in a target-specific way. */
2121 (trampoline_adjust_address,
2123 rtx, (rtx addr), NULL)
2125 /* Return the number of bytes of its own arguments that a function
2126 pops on returning, or 0 if the function pops no arguments and the
2127 caller must therefore pop them all after the function returns. */
2128 /* ??? tm.texi has no types for the parameters. */
2132 int, (tree fundecl, tree funtype, int size),
2133 default_return_pops_args)
2135 /* Return a mode wide enough to copy any function value that might be
2138 (get_raw_result_mode,
2139 "This target hook returns the mode to be used when accessing raw return\
2140 registers in @code{__builtin_return}. Define this macro if the value\
2141 in @var{reg_raw_mode} is not correct.",
2142 enum machine_mode, (int regno),
2143 default_get_reg_raw_mode)
2145 /* Return a mode wide enough to copy any argument value that might be
2149 "This target hook returns the mode to be used when accessing raw argument\
2150 registers in @code{__builtin_apply_args}. Define this macro if the value\
2151 in @var{reg_raw_mode} is not correct.",
2152 enum machine_mode, (int regno),
2153 default_get_reg_raw_mode)
2155 HOOK_VECTOR_END (calls)
2157 /* Return the diagnostic message string if conversion from FROMTYPE
2158 to TOTYPE is not allowed, NULL otherwise. */
2160 (invalid_conversion,
2162 const char *, (const_tree fromtype, const_tree totype),
2163 hook_constcharptr_const_tree_const_tree_null)
2165 /* Return the diagnostic message string if the unary operation OP is
2166 not permitted on TYPE, NULL otherwise. */
2170 const char *, (int op, const_tree type),
2171 hook_constcharptr_int_const_tree_null)
2173 /* Return the diagnostic message string if the binary operation OP
2174 is not permitted on TYPE1 and TYPE2, NULL otherwise. */
2178 const char *, (int op, const_tree type1, const_tree type2),
2179 hook_constcharptr_int_const_tree_const_tree_null)
2181 /* Return the diagnostic message string if TYPE is not valid as a
2182 function parameter type, NULL otherwise. */
2184 (invalid_parameter_type,
2186 const char *, (const_tree type),
2187 hook_constcharptr_const_tree_null)
2189 /* Return the diagnostic message string if TYPE is not valid as a
2190 function return type, NULL otherwise. */
2192 (invalid_return_type,
2194 const char *, (const_tree type),
2195 hook_constcharptr_const_tree_null)
2197 /* If values of TYPE are promoted to some other type when used in
2198 expressions (analogous to the integer promotions), return that type,
2199 or NULL_TREE otherwise. */
2203 tree, (const_tree type),
2204 hook_tree_const_tree_null)
2206 /* Convert EXPR to TYPE, if target-specific types with special conversion
2207 rules are involved. Return the converted expression, or NULL to apply
2208 the standard conversion rules. */
2212 tree, (tree type, tree expr),
2213 hook_tree_tree_tree_null)
2215 /* Return the class for a secondary reload, and fill in extra information. */
2220 (bool in_p, rtx x, reg_class_t reload_class, enum machine_mode reload_mode,
2221 secondary_reload_info *sri),
2222 default_secondary_reload)
2224 /* Given an rtx X being reloaded into a reg required to be in class CLASS,
2225 return the class of reg to actually use. */
2227 (preferred_reload_class,
2230 (rtx x, reg_class_t rclass),
2231 default_preferred_reload_class)
2233 /* Like TARGET_PREFERRED_RELOAD_CLASS, but for output reloads instead of
2236 (preferred_output_reload_class,
2239 (rtx x, reg_class_t rclass),
2240 default_preferred_output_reload_class)
2243 (class_likely_spilled_p,
2245 bool, (reg_class_t rclass),
2246 default_class_likely_spilled_p)
2248 /* Return the maximum number of consecutive registers
2249 needed to represent mode MODE in a register of class RCLASS. */
2253 unsigned char, (reg_class_t rclass, enum machine_mode mode),
2254 default_class_max_nregs)
2257 (preferred_rename_class,
2258 "A target hook that places additional preference on the register\
2259 class to use when it is necessary to rename a register in class\
2260 @var{rclass} to another class, or perhaps @var{NO_REGS}, if no\
2261 preferred register class is found or hook @code{preferred_rename_class}\
2262 is not implemented.\
2263 Sometimes returning a more restrictive class makes better code. For\
2264 example, on ARM, thumb-2 instructions using @code{LO_REGS} may be\
2265 smaller than instructions using @code{GENERIC_REGS}. By returning\
2266 @code{LO_REGS} from @code{preferred_rename_class}, code size can\
2268 reg_class_t, (reg_class_t rclass),
2269 default_preferred_rename_class)
2271 /* This target hook allows the backend to perform additional
2272 processing while initializing for variable expansion. */
2274 (expand_to_rtl_hook,
2279 /* This target hook allows the backend to perform additional
2280 instantiations on rtx that are not actually in insns yet,
2281 but will be later. */
2288 /* Return true if is OK to use a hard register REGNO as scratch register
2291 (hard_regno_scratch_ok,
2293 bool, (unsigned int regno),
2294 default_hard_regno_scratch_ok)
2296 /* Return the smallest number of different values for which it is best to
2297 use a jump-table instead of a tree of conditional branches. */
2299 (case_values_threshold,
2301 unsigned int, (void),
2302 default_case_values_threshold)
2304 /* Retutn true if a function must have and use a frame pointer. */
2306 (frame_pointer_required,
2309 hook_bool_void_false)
2311 /* Returns true if the compiler is allowed to try to replace register number
2312 from-reg with register number to-reg. */
2316 bool, (const int from_reg, const int to_reg),
2317 hook_bool_const_int_const_int_true)
2319 /* Modify any or all of fixed_regs, call_used_regs, global_regs,
2320 reg_names, and reg_class_contents to account of the vagaries of the
2323 (conditional_register_usage,
2328 /* Functions specific to the C family of frontends. */
2330 #define HOOK_PREFIX "TARGET_C_"
2331 HOOK_VECTOR (TARGET_C, c)
2333 /* ??? Documenting this hook requires a GFDL license grant. */
2336 "Return machine mode for non-standard constant literal suffix @var{c},\
2337 or VOIDmode if non-standard suffixes are unsupported.",
2338 enum machine_mode, (char c),
2339 default_mode_for_suffix)
2343 /* Functions specific to the C++ frontend. */
2345 #define HOOK_PREFIX "TARGET_CXX_"
2346 HOOK_VECTOR (TARGET_CXX, cxx)
2348 /* Return the integer type used for guard variables. */
2353 default_cxx_guard_type)
2355 /* Return true if only the low bit of the guard should be tested. */
2360 hook_bool_void_false)
2362 /* Returns the size of the array cookie for an array of type. */
2367 default_cxx_get_cookie_size)
2369 /* Returns true if the element size should be stored in the array cookie. */
2374 hook_bool_void_false)
2376 /* Allows backends to perform additional processing when
2377 deciding if a class should be exported or imported. */
2379 (import_export_class,
2381 int, (tree type, int import_export), NULL)
2383 /* Returns true if constructors and destructors return "this". */
2385 (cdtor_returns_this,
2388 hook_bool_void_false)
2390 /* Returns true if the key method for a class can be an inline
2391 function, so long as it is not declared inline in the class
2392 itself. Returning true is the behavior required by the Itanium C++ ABI. */
2394 (key_method_may_be_inline,
2397 hook_bool_void_true)
2400 (determine_class_data_visibility,
2401 "@var{decl} is a virtual table, virtual table table, typeinfo object,\
2402 or other similar implicit class data object that will be emitted with\
2403 external linkage in this translation unit. No ELF visibility has been\
2404 explicitly specified. If the target needs to specify a visibility\
2405 other than that of the containing class, use this hook to set\
2406 @code{DECL_VISIBILITY} and @code{DECL_VISIBILITY_SPECIFIED}.",
2410 /* Returns true (the default) if virtual tables and other
2411 similar implicit class data objects are always COMDAT if they
2412 have external linkage. If this hook returns false, then
2413 class data for classes whose virtual table will be emitted in
2414 only one translation unit will not be COMDAT. */
2416 (class_data_always_comdat,
2419 hook_bool_void_true)
2421 /* Returns true (the default) if the RTTI for the basic types,
2422 which is always defined in the C++ runtime, should be COMDAT;
2423 false if it should not be COMDAT. */
2425 (library_rtti_comdat,
2428 hook_bool_void_true)
2430 /* Returns true if __aeabi_atexit should be used to register static
2436 hook_bool_void_false)
2438 /* Returns true if target may use atexit in the same manner as
2439 __cxa_atexit to register static destructors. */
2441 (use_atexit_for_cxa_atexit,
2444 hook_bool_void_false)
2447 (adjust_class_at_definition,
2448 "@var{type} is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that has just\
2449 been defined. Use this hook to make adjustments to the class (eg, tweak\
2450 visibility or perform any other required target modifications).",
2455 (decl_mangling_context,
2456 "Return target-specific mangling context of @var{decl} or @code{NULL_TREE}.",
2457 tree, (const_tree decl),
2458 hook_tree_const_tree_null)
2460 HOOK_VECTOR_END (cxx)
2462 /* Functions and data for emulated TLS support. */
2464 #define HOOK_PREFIX "TARGET_EMUTLS_"
2465 HOOK_VECTOR (TARGET_EMUTLS, emutls)
2467 /* Name of the address and common functions. */
2471 const char *, "__builtin___emutls_get_address")
2476 const char *, "__builtin___emutls_register_common")
2478 /* Prefixes for proxy variable and template. */
2489 /* Prefixes for proxy variable and template. */
2500 /* Function to generate field definitions of the proxy variable. */
2504 tree, (tree type, tree *name),
2505 default_emutls_var_fields)
2507 /* Function to initialize a proxy variable. */
2511 tree, (tree var, tree decl, tree tmpl_addr),
2512 default_emutls_var_init)
2514 /* Whether we are allowed to alter the usual alignment of the
2521 /* Whether we can emit debug information for TLS vars. */
2523 (debug_form_tls_address,
2527 HOOK_VECTOR_END (emutls)
2530 #define HOOK_PREFIX "TARGET_OPTION_"
2531 HOOK_VECTOR (TARGET_OPTION_HOOKS, target_option_hooks)
2533 /* Function to validate the attribute((option(...))) strings or NULL. If
2534 the option is validated, it is assumed that DECL_FUNCTION_SPECIFIC will
2535 be filled in in the function decl node. */
2539 bool, (tree fndecl, tree name, tree args, int flags),
2540 default_target_option_valid_attribute_p)
2542 /* Function to save any extra target state in the target options structure. */
2546 void, (struct cl_target_option *ptr), NULL)
2548 /* Function to restore any extra target state from the target options
2553 void, (struct cl_target_option *ptr), NULL)
2555 /* Function to print any extra target state from the target options
2560 void, (FILE *file, int indent, struct cl_target_option *ptr), NULL)
2562 /* Function to parse arguments to be validated for #pragma option, and to
2563 change the state if the options are valid. If the first argument is
2564 NULL, the second argument specifies the default options to use. Return
2565 true if the options are valid, and set the current state. */
2566 /* ??? The documentation in tm.texi is incomplete. */
2570 bool, (tree args, tree pop_target),
2571 default_target_option_pragma_parse)
2573 /* Do option overrides for the target. */
2580 /* Function to determine if one function can inline another function. */
2582 #define HOOK_PREFIX "TARGET_"
2586 bool, (tree caller, tree callee),
2587 default_target_can_inline_p)
2589 HOOK_VECTOR_END (target_option)
2591 /* For targets that need to mark extra registers as live on entry to
2592 the function, they should define this target hook and set their
2593 bits in the bitmap passed in. */
2595 (extra_live_on_entry,
2597 void, (bitmap regs),
2600 /* Determine the type of unwind info to emit for debugging. */
2604 enum unwind_info_type, (void),
2605 default_debug_unwind_info)
2607 /* Leave the boolean fields at the end. */
2609 /* True if we can create zeroed data by switching to a BSS section
2610 and then using ASM_OUTPUT_SKIP to allocate the space. */
2612 (have_switchable_bss_sections,
2616 /* True if "native" constructors and destructors are supported,
2617 false if we're using collect2 for the job. */
2623 /* True if thread-local storage is supported. */
2629 /* True if a small readonly data section is supported. */
2631 (have_srodata_section,
2635 /* True if EH frame info sections should be zero-terminated. */
2637 (terminate_dw2_eh_frame_info,
2641 /* True if #NO_APP should be emitted at the beginning of assembly output. */
2643 (asm_file_start_app_off,
2647 /* True if output_file_directive should be called for main_input_filename
2648 at the beginning of assembly output. */
2650 (asm_file_start_file_directive,
2655 (handle_pragma_extern_prefix,
2656 "True if @code{#pragma extern_prefix} is to be supported.",
2659 /* True if the target is allowed to reorder memory accesses unless
2660 synchronization is explicitly requested. */
2666 /* Returns true if we should generate exception tables for use with the
2667 ARM EABI. The effects the encoding of function exception specifications. */
2674 (want_debug_pub_sections,
2675 "True if the @code{.debug_pubtypes} and @code{.debug_pubnames} sections\
2676 should be emitted. These sections are not used on most platforms, and\
2677 in particular GDB does not use them.",
2681 (delay_sched2, "True if sched2 is not to be run at its normal place. \
2682 This usually means it will be run as part of machine-specific reorg.",
2686 (delay_vartrack, "True if vartrack is not to be run at its normal place. \
2687 This usually means it will be run as part of machine-specific reorg.",
2690 /* Leave the boolean fields at the end. */
2692 /* Close the 'struct gcc_target' definition. */
2693 HOOK_VECTOR_END (C90_EMPTY_HACK)
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