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 any directives required to unwind this instruction. */
152 void, (FILE *stream, rtx insn),
155 /* Output an internal label. */
159 void, (FILE *stream, const char *prefix, unsigned long labelno),
160 default_internal_label)
162 /* Output label for the constant. */
164 (declare_constant_name,
166 void, (FILE *file, const char *name, const_tree expr, HOST_WIDE_INT size),
167 default_asm_declare_constant_name)
169 /* Emit a ttype table reference to a typeinfo object. */
176 /* Emit an assembler directive to set visibility for the symbol
177 associated with the tree decl. */
179 (assemble_visibility,
181 void, (tree decl, int visibility),
182 default_assemble_visibility)
184 /* Output the assembler code for entry to a function. */
188 void, (FILE *file, HOST_WIDE_INT size),
189 default_function_pro_epilogue)
191 /* Output the assembler code for end of prologue. */
193 (function_end_prologue,
198 /* Output the assembler code for start of epilogue. */
200 (function_begin_epilogue,
205 /* Output the assembler code for function exit. */
209 void, (FILE *file, HOST_WIDE_INT size),
210 default_function_pro_epilogue)
212 /* Initialize target-specific sections. */
219 /* Tell assembler to change to section NAME with attributes FLAGS.
220 If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with
221 which this section is associated. */
225 void, (const char *name, unsigned int flags, tree decl),
226 default_no_named_section)
228 /* Return a mask describing how relocations should be treated when
229 selecting sections. Bit 1 should be set if global relocations
230 should be placed in a read-write section; bit 0 should be set if
231 local relocations should be placed in a read-write section. */
236 default_reloc_rw_mask)
238 /* Return a section for EXP. It may be a DECL or a constant. RELOC
239 is nonzero if runtime relocations must be applied; bit 1 will be
240 set if the runtime relocations require non-local name resolution.
241 ALIGN is the required alignment of the data. */
245 section *, (tree exp, int reloc, unsigned HOST_WIDE_INT align),
246 default_select_section)
248 /* Return a section for X. MODE is X's mode and ALIGN is its
249 alignment in bits. */
253 section *, (enum machine_mode mode, rtx x, unsigned HOST_WIDE_INT align),
254 default_select_rtx_section)
256 /* Select a unique section name for DECL. RELOC is the same as
257 for SELECT_SECTION. */
261 void, (tree decl, int reloc),
262 default_unique_section)
264 /* Return the readonly data section associated with function DECL. */
266 (function_rodata_section,
268 section *, (tree decl),
269 default_function_rodata_section)
271 /* Output a constructor for a symbol with a given priority. */
275 void, (rtx symbol, int priority), NULL)
277 /* Output a destructor for a symbol with a given priority. */
281 void, (rtx symbol, int priority), NULL)
283 /* Output the assembler code for a thunk function. THUNK_DECL is the
284 declaration for the thunk function itself, FUNCTION is the decl for
285 the target function. DELTA is an immediate constant offset to be
286 added to THIS. If VCALL_OFFSET is nonzero, the word at
287 *(*this + vcall_offset) should be added to THIS. */
291 void, (FILE *file, tree thunk_fndecl, HOST_WIDE_INT delta,
292 HOST_WIDE_INT vcall_offset, tree function),
295 /* Determine whether output_mi_thunk would succeed. */
296 /* ??? Ideally, this hook would not exist, and success or failure
297 would be returned from output_mi_thunk directly. But there's
298 too much undo-able setup involved in invoking output_mi_thunk.
299 Could be fixed by making output_mi_thunk emit rtl instead of
300 text to the output file. */
302 (can_output_mi_thunk,
304 bool, (const_tree thunk_fndecl, HOST_WIDE_INT delta,
305 HOST_WIDE_INT vcall_offset, const_tree function),
306 hook_bool_const_tree_hwi_hwi_const_tree_false)
308 /* Output any boilerplate text needed at the beginning of a
316 /* Output any boilerplate text needed at the end of a translation unit. */
323 /* Output any boilerplate text needed at the beginning of an
324 LTO output stream. */
331 /* Output any boilerplate text needed at the end of an
332 LTO output stream. */
339 /* Output any boilerplace text needed at the end of a
340 translation unit before debug and unwind info is emitted. */
347 /* Output an assembler pseudo-op to declare a library function name
353 default_external_libcall)
355 /* Output an assembler directive to mark decl live. This instructs
356 linker to not dead code strip this symbol. */
358 (mark_decl_preserved,
360 void, (const char *symbol),
361 hook_void_constcharptr)
363 /* Output a record of the command line switches that have been passed. */
365 (record_gcc_switches,
367 int, (print_switch_type type, const char *text),
370 /* The name of the section that the example ELF implementation of
371 record_gcc_switches will use to store the information. Target
372 specific versions of record_gcc_switches may or may not use
375 (record_gcc_switches_section,
377 const char *, ".GCC.command.line")
379 /* Output the definition of a section anchor. */
384 default_asm_output_anchor)
386 /* Output a DTP-relative reference to a TLS symbol. */
388 (output_dwarf_dtprel,
390 void, (FILE *file, int size, rtx x),
393 /* Some target machines need to postscan each insn after it is output. */
395 (final_postscan_insn,
397 void, (FILE *file, rtx insn, rtx *opvec, int noperands),
400 /* Emit the trampoline template. This hook may be NULL. */
402 (trampoline_template,
407 /* ??? The TARGET_PRINT_OPERAND* hooks are part of the asm_out struct,
408 even though that is not reflected in the macro name to override their
411 #define HOOK_PREFIX "TARGET_"
413 /* Emit a machine-specific insn operand. */
414 /* ??? Documenting the argument types for this hook requires a GFDL
415 license grant. Also, the documentation documents this as a macro,
416 not a hook, and uses a different name for the hook argument FILE. */
420 void, (FILE *file, rtx x, int code),
421 default_print_operand)
423 /* Emit a machine-specific memory address. */
424 /* ??? Documenting the argument types for this hook requires a GFDL
425 license grant. Also, the documentation documents this as a macro,
426 not a hook, and uses different hook argument names. */
428 (print_operand_address,
430 void, (FILE *file, rtx addr),
431 default_print_operand_address)
433 /* Determine whether CODE is a valid punctuation character for the
434 `print_operand' hook. */
435 /* ??? Documenting the argument types for this hook requires a GFDL
436 license grant. Also, the documentation documents this as a macro,
439 (print_operand_punct_valid_p,
441 bool ,(unsigned char code),
442 default_print_operand_punct_valid_p)
444 HOOK_VECTOR_END (asm_out)
446 /* Functions relating to instruction scheduling. All of these
447 default to null pointers, which haifa-sched.c looks for and handles. */
449 #define HOOK_PREFIX "TARGET_SCHED_"
450 HOOK_VECTOR (TARGET_SCHED, sched)
452 /* Given the current cost, COST, of an insn, INSN, calculate and
453 return a new cost based on its relationship to DEP_INSN through
454 the dependence LINK. The default is to make no adjustment. */
458 int, (rtx insn, rtx link, rtx dep_insn, int cost), NULL)
460 /* Adjust the priority of an insn as you see fit. Returns the new priority. */
464 int, (rtx insn, int priority), NULL)
466 /* Function which returns the maximum number of insns that can be
467 scheduled in the same machine cycle. This must be constant
468 over an entire compilation. The default is 1. */
474 /* Calculate how much this insn affects how many more insns we
475 can emit this cycle. Default is they all cost the same. */
479 int, (FILE *file, int verbose, rtx insn, int more), NULL)
481 /* Initialize machine-dependent scheduling code. */
485 void, (FILE *file, int verbose, int max_ready), NULL)
487 /* Finalize machine-dependent scheduling code. */
491 void, (FILE *file, int verbose), NULL)
493 /* Initialize machine-dependent function wide scheduling code. */
497 void, (FILE *file, int verbose, int old_max_uid), NULL)
499 /* Finalize machine-dependent function wide scheduling code. */
503 void, (FILE *file, int verbose), NULL)
505 /* Reorder insns in a machine-dependent fashion, in two different
506 places. Default does nothing. */
510 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
515 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
517 /* The following member value is a pointer to a function called
518 after evaluation forward dependencies of insns in chain given
519 by two parameter values (head and tail correspondingly). */
521 (dependencies_evaluation_hook,
523 void, (rtx head, rtx tail), NULL)
525 /* The values of the following four members are pointers to functions
526 used to simplify the automaton descriptions. dfa_pre_cycle_insn and
527 dfa_post_cycle_insn give functions returning insns which are used to
528 change the pipeline hazard recognizer state when the new simulated
529 processor cycle correspondingly starts and finishes. The function
530 defined by init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are
531 used to initialize the corresponding insns. The default values of
532 the members result in not changing the automaton state when the
533 new simulated processor cycle correspondingly starts and finishes. */
536 (init_dfa_pre_cycle_insn,
546 (init_dfa_post_cycle_insn,
551 (dfa_post_cycle_insn,
555 /* The values of the following two members are pointers to
556 functions used to simplify the automaton descriptions.
557 dfa_pre_advance_cycle and dfa_post_advance_cycle are getting called
558 immediately before and after cycle is advanced. */
561 (dfa_pre_advance_cycle,
566 (dfa_post_advance_cycle,
570 /* The following member value is a pointer to a function returning value
571 which defines how many insns in queue `ready' will we try for
572 multi-pass scheduling. If the member value is nonzero and the
573 function returns positive value, the DFA based scheduler will make
574 multi-pass scheduling for the first cycle. In other words, we will
575 try to choose ready insn which permits to start maximum number of
576 insns on the same cycle. */
578 (first_cycle_multipass_dfa_lookahead,
582 /* The following member value is pointer to a function controlling
583 what insns from the ready insn queue will be considered for the
584 multipass insn scheduling. If the hook returns zero for insn
585 passed as the parameter, the insn will be not chosen to be issued. */
587 (first_cycle_multipass_dfa_lookahead_guard,
589 int, (rtx insn), NULL)
591 /* The following member value is pointer to a function called by
592 the insn scheduler before issuing insn passed as the third
593 parameter on given cycle. If the hook returns nonzero, the
594 insn is not issued on given processors cycle. Instead of that,
595 the processor cycle is advanced. If the value passed through
596 the last parameter is zero, the insn ready queue is not sorted
597 on the new cycle start as usually. The first parameter passes
598 file for debugging output. The second one passes the scheduler
599 verbose level of the debugging output. The forth and the fifth
600 parameter values are correspondingly processor cycle on which
601 the previous insn has been issued and the current processor cycle. */
602 /* ??? The documentation uses different names for dump_file,
603 last_sched_cycle and cur_cycle. */
607 int, (FILE *dump_file, int verbose, rtx insn, int last_sched_cycle,
608 int cur_cycle, int *sort_p),
611 /* The following member value is a pointer to a function called by the
612 insn scheduler. It should return true if there exists a dependence
613 which is considered costly by the target, between the insn
614 DEP_PRO (&_DEP), and the insn DEP_CON (&_DEP). The first parameter is
615 the dep that represents the dependence between the two insns. The
616 second argument is the cost of the dependence as estimated by
617 the scheduler. The last argument is the distance in cycles
618 between the already scheduled insn (first parameter) and the
619 second insn (second parameter). */
621 (is_costly_dependence,
623 bool, (struct _dep *_dep, int cost, int distance), NULL)
627 "Given the current cost, @var{cost}, of an insn, @var{insn}, calculate and\
628 return a new cost based on its relationship to @var{dep_insn} through the\
629 dependence of weakness @var{dw}. The default is to make no adjustment.",
630 int, (rtx insn, int dep_type1, rtx dep_insn, int cost, int dw), NULL)
632 /* The following member value is a pointer to a function called
633 by the insn scheduler. This hook is called to notify the backend
634 that new instructions were emitted. */
640 /* Next 5 functions are for multi-point scheduling. */
642 /* Allocate memory for scheduler context. */
644 (alloc_sched_context,
646 void *, (void), NULL)
648 /* Fills the context from the local machine scheduler context. */
652 void, (void *tc, bool clean_p), NULL)
654 /* Sets local machine scheduler context to a saved value. */
658 void, (void *tc), NULL)
660 /* Clears a scheduler context so it becomes like after init. */
662 (clear_sched_context,
664 void, (void *tc), NULL)
666 /* Frees the scheduler context. */
670 void, (void *tc), NULL)
672 /* The following member value is a pointer to a function called
673 by the insn scheduler.
674 The first parameter is an instruction, the second parameter is the type
675 of the requested speculation, and the third parameter is a pointer to the
676 speculative pattern of the corresponding type (set if return value == 1).
678 -1, if there is no pattern, that will satisfy the requested speculation type,
679 0, if current pattern satisfies the requested speculation type,
680 1, if pattern of the instruction should be changed to the newly
685 int, (rtx insn, int request, rtx *new_pat), NULL)
687 /* The following member value is a pointer to a function called
688 by the insn scheduler. It should return true if the check instruction
689 passed as the parameter needs a recovery block. */
693 bool, (int dep_status), NULL)
695 /* The following member value is a pointer to a function called
696 by the insn scheduler. It should return a pattern for the check
698 The first parameter is a speculative instruction, the second parameter
699 is the label of the corresponding recovery block (or null, if it is a
700 simple check). If the mutation of the check is requested (e.g. from
701 ld.c to chk.a), the third parameter is true - in this case the first
702 parameter is the previous check. */
706 rtx, (rtx insn, rtx label, int mutate_p), NULL)
708 /* The following member value is a pointer to a function controlling
709 what insns from the ready insn queue will be considered for the
710 multipass insn scheduling. If the hook returns zero for the insn
711 passed as the parameter, the insn will not be chosen to be
712 issued. This hook is used to discard speculative instructions,
713 that stand at the first position of the ready list. */
715 (first_cycle_multipass_dfa_lookahead_guard_spec,
717 bool, (const_rtx insn), NULL)
719 /* The following member value is a pointer to a function that provides
720 information about the speculation capabilities of the target.
721 The parameter is a pointer to spec_info variable. */
725 void, (struct spec_info_def *spec_info), NULL)
729 "Return speculation types of instruction @var{insn}.",
730 int, (rtx insn), NULL)
733 (get_insn_checked_ds,
734 "Return speculation types that are checked for instruction @var{insn}",
735 int, (rtx insn), NULL)
739 "Return bool if rtx scanning should just skip current layer and\
740 advance to the inner rtxes.",
741 bool, (const_rtx x), NULL)
743 /* The following member value is a pointer to a function that provides
744 information about the target resource-based lower bound which is
745 used by the swing modulo scheduler. The parameter is a pointer
750 int, (struct ddg *g), NULL)
752 HOOK_VECTOR_END (sched)
754 /* Functions relating to vectorization. */
756 #define HOOK_PREFIX "TARGET_VECTORIZE_"
757 HOOK_VECTOR (TARGET_VECTORIZE, vectorize)
759 /* The following member value is a pointer to a function called
760 by the vectorizer, and return the decl of the target builtin
763 (builtin_mask_for_load,
767 /* Returns a code for builtin that realizes vectorized version of
768 function, or NULL_TREE if not available. */
770 (builtin_vectorized_function,
772 tree, (tree fndecl, tree vec_type_out, tree vec_type_in),
773 default_builtin_vectorized_function)
775 /* Returns a function declaration for a builtin that realizes the
776 vector conversion, or NULL_TREE if not available. */
780 tree, (unsigned code, tree dest_type, tree src_type),
781 default_builtin_vectorized_conversion)
783 /* Target builtin that implements vector widening multiplication.
784 builtin_mul_widen_eve computes the element-by-element products
785 for the even elements, and builtin_mul_widen_odd computes the
786 element-by-element products for the odd elements. */
788 (builtin_mul_widen_even,
790 tree, (tree x), NULL)
793 (builtin_mul_widen_odd,
795 tree, (tree x), NULL)
797 /* Cost of different vector/scalar statements in vectorization cost model. */
799 (builtin_vectorization_cost,
801 int, (enum vect_cost_for_stmt type_of_cost),
802 default_builtin_vectorization_cost)
804 /* Return true if vector alignment is reachable (by peeling N
805 iterations) for the given type. */
807 (vector_alignment_reachable,
809 bool, (const_tree type, bool is_packed),
810 default_builtin_vector_alignment_reachable)
812 /* Target builtin that implements vector permute. */
816 tree, (tree type, tree *mask_element_type), NULL)
818 /* Return true if a vector created for builtin_vec_perm is valid. */
820 (builtin_vec_perm_ok,
822 bool, (tree vec_type, tree mask),
823 hook_bool_tree_tree_true)
825 /* Return true if the target supports misaligned store/load of a
826 specific factor denoted in the third parameter. The last parameter
827 is true if the access is defined in a packed struct. */
829 (support_vector_misalignment,
832 (enum machine_mode mode, const_tree type, int misalignment, bool is_packed),
833 default_builtin_support_vector_misalignment)
835 HOOK_VECTOR_END (vectorize)
838 #define HOOK_PREFIX "TARGET_"
840 /* The initial value of target_flags. */
842 (default_target_flags,
846 /* Allow target specific overriding of option settings after options have
847 been changed by an attribute or pragma or when it is reset at the
848 end of the code affected by an attribute or pragma. */
850 (override_options_after_change,
855 /* Handle target switch CODE (an OPT_* value). ARG is the argument
856 passed to the switch; it is NULL if no argument was. VALUE is the
857 value of ARG if CODE specifies a UInteger option, otherwise it is
858 1 if the positive form of the switch was used and 0 if the negative
859 form was. Return true if the switch was valid. */
863 bool, (size_t code, const char *arg, int value),
864 hook_bool_size_t_constcharptr_int_true)
866 /* ??? Documenting this hook requires a GFDL license grant. */
869 "Handle target-specific parts of specifying -Ofast.",
873 /* Display extra, target specific information in response to a
874 --target-help switch. */
881 (eh_return_filter_mode,
882 "Return machine mode for filter value.",
883 enum machine_mode, (void),
884 default_eh_return_filter_mode)
886 /* Return machine mode for libgcc expanded cmp instructions. */
888 (libgcc_cmp_return_mode,
890 enum machine_mode, (void),
891 default_libgcc_cmp_return_mode)
893 /* Return machine mode for libgcc expanded shift instructions. */
895 (libgcc_shift_count_mode,
897 enum machine_mode, (void),
898 default_libgcc_shift_count_mode)
900 /* Return machine mode to be used for _Unwind_Word type. */
904 enum machine_mode, (void),
905 default_unwind_word_mode)
907 /* Given two decls, merge their attributes and return the result. */
909 (merge_decl_attributes,
911 tree, (tree olddecl, tree newdecl),
912 merge_decl_attributes)
914 /* Given two types, merge their attributes and return the result. */
916 (merge_type_attributes,
918 tree, (tree type1, tree type2),
919 merge_type_attributes)
921 /* Table of machine attributes and functions to handle them.
926 const struct attribute_spec *, NULL)
928 /* Return true iff attribute NAME expects a plain identifier as its first
931 (attribute_takes_identifier_p,
933 bool, (const_tree name),
934 hook_bool_const_tree_false)
936 /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
937 one if they are compatible and two if they are nearly compatible
938 (which causes a warning to be generated). */
940 (comp_type_attributes,
942 int, (const_tree type1, const_tree type2),
943 hook_int_const_tree_const_tree_1)
945 /* Assign default attributes to the newly defined TYPE. */
947 (set_default_type_attributes,
952 /* Insert attributes on the newly created DECL. */
956 void, (tree node, tree *attr_ptr),
957 hook_void_tree_treeptr)
959 /* Return true if FNDECL (which has at least one machine attribute)
960 can be inlined despite its machine attributes, false otherwise. */
962 (function_attribute_inlinable_p,
964 bool, (const_tree fndecl),
965 hook_bool_const_tree_false)
967 /* Return true if bitfields in RECORD_TYPE should follow the
968 Microsoft Visual C++ bitfield layout rules. */
970 (ms_bitfield_layout_p,
972 bool, (const_tree record_type),
973 hook_bool_const_tree_false)
975 /* True if the target supports decimal floating point. */
977 (decimal_float_supported_p,
980 default_decimal_float_supported_p)
982 /* True if the target supports fixed-point. */
984 (fixed_point_supported_p,
987 default_fixed_point_supported_p)
989 /* Return true if anonymous bitfields affect structure alignment. */
991 (align_anon_bitfield,
994 hook_bool_void_false)
996 /* Return true if volatile bitfields should use the narrowest type possible.
997 Return false if they should use the container type. */
999 (narrow_volatile_bitfield,
1002 hook_bool_void_false)
1004 /* Set up target-specific built-in functions. */
1011 /* Initialize (if INITIALIZE_P is true) and return the target-specific
1012 built-in function decl for CODE.
1013 Return NULL if that is not possible. Return error_mark_node if CODE
1014 is outside of the range of valid target builtin function codes. */
1018 tree, (unsigned code, bool initialize_p), NULL)
1020 /* Expand a target-specific builtin. */
1025 (tree exp, rtx target, rtx subtarget, enum machine_mode mode, int ignore),
1026 default_expand_builtin)
1028 /* Select a replacement for a target-specific builtin. This is done
1029 *before* regular type checking, and so allows the target to
1030 implement a crude form of function overloading. The result is a
1031 complete expression that implements the operation. PARAMS really
1032 has type VEC(tree,gc)*, but we don't want to include tree.h here. */
1033 /* ??? params is called differently in the documentation, and we can't
1034 fix that because of GPL / GFDL incompatibility. */
1036 (resolve_overloaded_builtin,
1038 tree, (unsigned int /*location_t*/ loc, tree fndecl, void *params), NULL)
1040 /* Fold a target-specific builtin. */
1044 tree, (tree fndecl, int n_args, tree *argp, bool ignore),
1045 hook_tree_tree_int_treep_bool_null)
1047 /* Returns a code for a target-specific builtin that implements
1048 reciprocal of the function, or NULL_TREE if not available. */
1050 (builtin_reciprocal,
1052 tree, (unsigned fn, bool md_fn, bool sqrt),
1053 default_builtin_reciprocal)
1055 /* For a vendor-specific TYPE, return a pointer to a statically-allocated
1056 string containing the C++ mangling for TYPE. In all other cases, return
1061 const char *, (const_tree type),
1062 hook_constcharptr_const_tree_null)
1064 /* Make any adjustments to libfunc names needed for this target. */
1071 /* Given a decl, a section name, and whether the decl initializer
1072 has relocs, choose attributes for the section. */
1073 /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */
1075 (section_type_flags,
1077 unsigned int, (tree decl, const char *name, int reloc),
1078 default_section_type_flags)
1080 /* True if new jumps cannot be created, to replace existing ones or
1081 not, at the current point in the compilation. */
1083 (cannot_modify_jumps_p,
1086 hook_bool_void_false)
1088 /* Return a register class for which branch target register
1089 optimizations should be applied. */
1091 (branch_target_register_class,
1093 enum reg_class, (void),
1094 default_branch_target_register_class)
1096 /* Return true if branch target register optimizations should include
1097 callee-saved registers that are not already live during the current
1098 function. AFTER_PE_GEN is true if prologues and epilogues have
1099 already been generated. */
1101 (branch_target_register_callee_saved,
1103 bool, (bool after_prologue_epilogue_gen),
1104 hook_bool_bool_false)
1106 /* Return true if the target supports conditional execution. */
1108 (have_conditional_execution,
1111 default_have_conditional_execution)
1113 /* Return a new value for loop unroll size. */
1115 (loop_unroll_adjust,
1117 unsigned, (unsigned nunroll, struct loop *loop),
1120 /* True if the constant X cannot be placed in the constant pool. */
1122 (cannot_force_const_mem,
1125 hook_bool_rtx_false)
1128 (cannot_copy_insn_p,
1129 "True if the insn @var{x} cannot be duplicated.",
1132 /* True if X is considered to be commutative. */
1136 bool, (const_rtx x, int outer_code),
1137 hook_bool_const_rtx_commutative_p)
1139 /* True if ADDR is an address-expression whose effect depends
1140 on the mode of the memory reference it is used in. */
1142 (mode_dependent_address_p,
1144 bool, (const_rtx addr),
1145 default_mode_dependent_address_p)
1147 /* Given an invalid address X for a given machine mode, try machine-specific
1148 ways to make it legitimate. Return X or an invalid address on failure. */
1150 (legitimize_address,
1152 rtx, (rtx x, rtx oldx, enum machine_mode mode),
1153 default_legitimize_address)
1155 /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */
1157 (delegitimize_address,
1160 delegitimize_mem_from_attrs)
1162 /* Given an address RTX, say whether it is valid. */
1164 (legitimate_address_p,
1166 bool, (enum machine_mode mode, rtx x, bool strict),
1167 default_legitimate_address_p)
1169 /* True if the given constant can be put into an object_block. */
1171 (use_blocks_for_constant_p,
1173 bool, (enum machine_mode mode, const_rtx x),
1174 hook_bool_mode_const_rtx_false)
1176 /* The minimum and maximum byte offsets for anchored addresses. */
1187 /* True if section anchors can be used to access the given symbol. */
1189 (use_anchors_for_symbol_p,
1191 bool, (const_rtx x),
1192 default_use_anchors_for_symbol_p)
1194 /* True if it is OK to do sibling call optimization for the specified
1195 call expression EXP. DECL will be the called function, or NULL if
1196 this is an indirect call. */
1198 (function_ok_for_sibcall,
1200 bool, (tree decl, tree exp),
1201 hook_bool_tree_tree_false)
1203 /* Establish appropriate back-end context for processing the function
1204 FNDECL. The argument might be NULL to indicate processing at top
1205 level, outside of any function scope. */
1207 (set_current_function,
1209 void, (tree decl), hook_void_tree)
1211 /* True if EXP should be placed in a "small data" section. */
1215 bool, (const_tree exp),
1216 hook_bool_const_tree_false)
1218 /* True if EXP names an object for which name resolution must resolve
1219 to the current executable or shared library. */
1223 bool, (const_tree exp),
1224 default_binds_local_p)
1226 /* Modify and return the identifier of a DECL's external name,
1227 originally identified by ID, as required by the target,
1228 (eg, append @nn to windows32 stdcall function names).
1229 The default is to return ID without modification. */
1231 (mangle_decl_assembler_name,
1233 tree, (tree decl, tree id),
1234 default_mangle_decl_assembler_name)
1236 /* Do something target-specific to record properties of the DECL into
1237 the associated SYMBOL_REF. */
1239 (encode_section_info,
1241 void, (tree decl, rtx rtl, int new_decl_p),
1242 default_encode_section_info)
1244 /* Undo the effects of encode_section_info on the symbol string. */
1246 (strip_name_encoding,
1248 const char *, (const char *name),
1249 default_strip_name_encoding)
1251 /* If shift optabs for MODE are known to always truncate the shift count,
1252 return the mask that they apply. Return 0 otherwise. */
1254 (shift_truncation_mask,
1256 unsigned HOST_WIDE_INT, (enum machine_mode mode),
1257 default_shift_truncation_mask)
1259 /* Return the number of divisions in the given MODE that should be present,
1260 so that it is profitable to turn the division into a multiplication by
1263 (min_divisions_for_recip_mul,
1265 unsigned int, (enum machine_mode mode),
1266 default_min_divisions_for_recip_mul)
1268 /* If the representation of integral MODE is such that values are
1269 always sign-extended to a wider mode MODE_REP then return
1270 SIGN_EXTEND. Return UNKNOWN otherwise. */
1271 /* Note that the return type ought to be RTX_CODE, but that's not
1272 necessarily defined at this point. */
1276 int, (enum machine_mode mode, enum machine_mode rep_mode),
1277 default_mode_rep_extended)
1279 /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */
1281 (valid_pointer_mode,
1283 bool, (enum machine_mode mode),
1284 default_valid_pointer_mode)
1286 /* Support for named address spaces. */
1288 #define HOOK_PREFIX "TARGET_ADDR_SPACE_"
1289 HOOK_VECTOR (TARGET_ADDR_SPACE_HOOKS, addr_space)
1291 /* MODE to use for a pointer into another address space. */
1295 enum machine_mode, (addr_space_t address_space),
1296 default_addr_space_pointer_mode)
1298 /* MODE to use for an address in another address space. */
1302 enum machine_mode, (addr_space_t address_space),
1303 default_addr_space_address_mode)
1305 /* True if MODE is valid for a pointer in __attribute__((mode("MODE")))
1306 in another address space. */
1308 (valid_pointer_mode,
1310 bool, (enum machine_mode mode, addr_space_t as),
1311 default_addr_space_valid_pointer_mode)
1313 /* True if an address is a valid memory address to a given named address
1314 space for a given mode. */
1316 (legitimate_address_p,
1318 bool, (enum machine_mode mode, rtx exp, bool strict, addr_space_t as),
1319 default_addr_space_legitimate_address_p)
1321 /* Return an updated address to convert an invalid pointer to a named
1322 address space to a valid one. If NULL_RTX is returned use machine
1323 independent methods to make the address valid. */
1325 (legitimize_address,
1327 rtx, (rtx x, rtx oldx, enum machine_mode mode, addr_space_t as),
1328 default_addr_space_legitimize_address)
1330 /* True if one named address space is a subset of another named address. */
1334 bool, (addr_space_t superset, addr_space_t subset),
1335 default_addr_space_subset_p)
1337 /* Function to convert an rtl expression from one address space to another. */
1341 rtx, (rtx op, tree from_type, tree to_type),
1342 default_addr_space_convert)
1344 HOOK_VECTOR_END (addr_space)
1347 #define HOOK_PREFIX "TARGET_"
1349 /* True if MODE is valid for the target. By "valid", we mean able to
1350 be manipulated in non-trivial ways. In particular, this means all
1351 the arithmetic is supported. */
1353 (scalar_mode_supported_p,
1355 bool, (enum machine_mode mode),
1356 default_scalar_mode_supported_p)
1358 /* Similarly for vector modes. "Supported" here is less strict. At
1359 least some operations are supported; need to check optabs or builtins
1360 for further details. */
1362 (vector_mode_supported_p,
1364 bool, (enum machine_mode mode),
1365 hook_bool_mode_false)
1367 /* Compute cost of moving data from a register of class FROM to one of
1370 (register_move_cost,
1372 int, (enum machine_mode mode, enum reg_class from, enum reg_class to),
1373 default_register_move_cost)
1375 /* Compute cost of moving registers to/from memory. */
1376 /* ??? Documenting the argument types for this hook requires a GFDL
1377 license grant. Also, the documentation uses a different name for RCLASS. */
1381 int, (enum machine_mode mode, enum reg_class rclass, bool in),
1382 default_memory_move_cost)
1384 /* True for MODE if the target expects that registers in this mode will
1385 be allocated to registers in a small register class. The compiler is
1386 allowed to use registers explicitly used in the rtl as spill registers
1387 but it should prevent extending the lifetime of these registers. */
1389 (small_register_classes_for_mode_p,
1391 bool, (enum machine_mode mode),
1392 hook_bool_mode_false)
1394 /* Compute a (partial) cost for rtx X. Return true if the complete
1395 cost has been computed, and false if subexpressions should be
1396 scanned. In either case, *TOTAL contains the cost result. */
1397 /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's
1398 not necessarily defined at this point. */
1402 bool, (rtx x, int code, int outer_code, int *total, bool speed),
1403 hook_bool_rtx_int_int_intp_bool_false)
1405 /* Compute the cost of X, used as an address. Never called with
1406 invalid addresses. */
1410 int, (rtx address, bool speed),
1411 default_address_cost)
1413 /* Return where to allocate pseudo for a given hard register initial value. */
1415 (allocate_initial_value,
1417 rtx, (rtx hard_reg), NULL)
1419 /* Return nonzero if evaluating UNSPEC[_VOLATILE] X might cause a trap.
1420 FLAGS has the same meaning as in rtlanal.c: may_trap_p_1. */
1424 int, (const_rtx x, unsigned flags),
1425 default_unspec_may_trap_p)
1427 /* Given a register, this hook should return a parallel of registers
1428 to represent where to find the register pieces. Define this hook
1429 if the register and its mode are represented in Dwarf in
1430 non-contiguous locations, or if the register should be
1431 represented in more than one register in Dwarf. Otherwise, this
1432 hook should return NULL_RTX. */
1434 (dwarf_register_span,
1439 /* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
1440 entries not corresponding directly to registers below
1441 FIRST_PSEUDO_REGISTER, this hook should generate the necessary
1442 code, given the address of the table. */
1444 (init_dwarf_reg_sizes_extra,
1446 void, (tree address),
1449 /* Fetch the fixed register(s) which hold condition codes, for
1450 targets where it makes sense to look for duplicate assignments to
1451 the condition codes. This should return true if there is such a
1452 register, false otherwise. The arguments should be set to the
1453 fixed register numbers. Up to two condition code registers are
1454 supported. If there is only one for this target, the int pointed
1455 at by the second argument should be set to -1. */
1457 (fixed_condition_code_regs,
1459 bool, (unsigned int *p1, unsigned int *p2),
1460 hook_bool_uintp_uintp_false)
1462 /* If two condition code modes are compatible, return a condition
1463 code mode which is compatible with both, such that a comparison
1464 done in the returned mode will work for both of the original
1465 modes. If the condition code modes are not compatible, return
1468 (cc_modes_compatible,
1470 enum machine_mode, (enum machine_mode m1, enum machine_mode m2),
1471 default_cc_modes_compatible)
1473 /* Do machine-dependent code transformations. Called just before
1474 delayed-branch scheduling. */
1476 (machine_dependent_reorg,
1480 /* Create the __builtin_va_list type. */
1482 (build_builtin_va_list,
1485 std_build_builtin_va_list)
1487 /* Enumerate the va list variants. */
1491 int, (int idx, const char **pname, tree *ptree),
1494 /* Get the cfun/fndecl calling abi __builtin_va_list type. */
1498 tree, (tree fndecl),
1501 /* Get the __builtin_va_list type dependent on input type. */
1503 (canonical_va_list_type,
1506 std_canonical_va_list_type)
1508 /* ??? Documenting this hook requires a GFDL license grant. */
1510 (expand_builtin_va_start,
1511 "Expand the @code{__builtin_va_start} builtin.",
1512 void, (tree valist, rtx nextarg), NULL)
1514 /* Gimplifies a VA_ARG_EXPR. */
1516 (gimplify_va_arg_expr,
1518 tree, (tree valist, tree type, gimple_seq *pre_p, gimple_seq *post_p),
1519 std_gimplify_va_arg_expr)
1521 /* Validity-checking routines for PCH files, target-specific.
1522 get_pch_validity returns a pointer to the data to be stored,
1523 and stores the size in its argument. pch_valid_p gets the same
1524 information back and returns NULL if the PCH is valid,
1525 or an error message if not. */
1529 void *, (size_t *sz),
1530 default_get_pch_validity)
1535 const char *, (const void *data, size_t sz),
1536 default_pch_valid_p)
1538 /* If nonnull, this function checks whether a PCH file with the
1539 given set of target flags can be used. It returns NULL if so,
1540 otherwise it returns an error message. */
1542 (check_pch_target_flags,
1544 const char *, (int pch_flags), NULL)
1546 /* True if the compiler should give an enum type only as many
1547 bytes as it takes to represent the range of possible values of
1550 (default_short_enums,
1553 hook_bool_void_false)
1555 /* This target hook returns an rtx that is used to store the address
1556 of the current frame into the built-in setjmp buffer. */
1558 (builtin_setjmp_frame_value,
1561 default_builtin_setjmp_frame_value)
1563 /* This target hook should add STRING_CST trees for any hard regs
1564 the port wishes to automatically clobber for an asm. */
1568 tree, (tree outputs, tree inputs, tree clobbers),
1569 hook_tree_tree_tree_tree_3rd_identity)
1571 /* This target hook allows the backend to specify a calling convention
1572 in the debug information. This function actually returns an
1573 enum dwarf_calling_convention, but because of forward declarations
1574 and not wanting to include dwarf2.h everywhere target.h is included
1575 the function is being declared as an int. */
1577 (dwarf_calling_convention,
1579 int, (const_tree function),
1580 hook_int_const_tree_0)
1582 /* This target hook allows the backend to emit frame-related insns that
1583 contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info
1584 engine will invoke it on insns of the form
1585 (set (reg) (unspec [...] UNSPEC_INDEX))
1587 (set (reg) (unspec_volatile [...] UNSPECV_INDEX))
1588 to let the backend emit the call frame instructions. */
1590 (dwarf_handle_frame_unspec,
1592 void, (const char *label, rtx pattern, int index), NULL)
1594 /* ??? Documenting this hook requires a GFDL license grant. */
1596 (stdarg_optimize_hook,
1597 "Perform architecture specific checking of statements gimplified\
1598 from @code{VA_ARG_EXPR}. @var{stmt} is the statement. Returns true if\
1599 the statement doesn't need to be checked for @code{va_list} references.",
1600 bool, (struct stdarg_info *ai, const_gimple stmt), NULL)
1602 /* This target hook allows the operating system to override the DECL
1603 that represents the external variable that contains the stack
1604 protection guard variable. The type of this DECL is ptr_type_node. */
1606 (stack_protect_guard,
1609 default_stack_protect_guard)
1611 /* This target hook allows the operating system to override the CALL_EXPR
1612 that is invoked when a check vs the guard variable fails. */
1614 (stack_protect_fail,
1617 default_external_stack_protect_fail)
1619 /* Returns NULL if target supports the insn within a doloop block,
1620 otherwise it returns an error message. */
1622 (invalid_within_doloop,
1624 const char *, (const_rtx insn),
1625 default_invalid_within_doloop)
1628 (valid_dllimport_attribute_p,
1629 "@var{decl} is a variable or function with @code{__attribute__((dllimport))}\
1630 specified. Use this hook if the target needs to add extra validation\
1631 checks to @code{handle_dll_attribute}.",
1632 bool, (const_tree decl),
1633 hook_bool_const_tree_true)
1635 /* If non-zero, align constant anchors in CSE to a multiple of this
1640 unsigned HOST_WIDE_INT, 0)
1642 /* Functions relating to calls - argument passing, returns, etc. */
1643 /* Members of struct call have no special macro prefix. */
1644 HOOK_VECTOR (TARGET_CALLS, calls)
1647 (promote_function_mode,
1649 enum machine_mode, (const_tree type, enum machine_mode mode, int *punsignedp,
1650 const_tree funtype, int for_return),
1651 default_promote_function_mode)
1654 (promote_prototypes,
1656 bool, (const_tree fntype),
1657 hook_bool_const_tree_false)
1662 rtx, (tree fndecl, int incoming),
1663 hook_rtx_tree_int_null)
1667 bool, (const_tree type, const_tree fntype),
1668 default_return_in_memory)
1673 bool, (const_tree type),
1674 hook_bool_const_tree_false)
1676 /* Return true if a parameter must be passed by reference. TYPE may
1677 be null if this is a libcall. CA may be null if this query is
1678 from __builtin_va_arg. */
1683 (CUMULATIVE_ARGS *cum, enum machine_mode mode, const_tree type, bool named),
1684 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
1687 (expand_builtin_saveregs,
1690 default_expand_builtin_saveregs)
1692 /* Returns pretend_argument_size. */
1694 (setup_incoming_varargs,
1696 void, (CUMULATIVE_ARGS *args_so_far, enum machine_mode mode, tree type,
1697 int *pretend_args_size, int second_time),
1698 default_setup_incoming_varargs)
1701 (strict_argument_naming,
1703 bool, (CUMULATIVE_ARGS *ca),
1704 hook_bool_CUMULATIVE_ARGS_false)
1706 /* Returns true if we should use
1707 targetm.calls.setup_incoming_varargs() and/or
1708 targetm.calls.strict_argument_naming(). */
1710 (pretend_outgoing_varargs_named,
1712 bool, (CUMULATIVE_ARGS *ca),
1713 default_pretend_outgoing_varargs_named)
1715 /* Given a complex type T, return true if a parameter of type T
1716 should be passed as two scalars. */
1720 bool, (const_tree type), NULL)
1722 /* Return true if type T, mode MODE, may not be passed in registers,
1723 but must be passed on the stack. */
1724 /* ??? This predicate should be applied strictly after pass-by-reference.
1725 Need audit to verify that this is the case. */
1727 (must_pass_in_stack,
1729 bool, (enum machine_mode mode, const_tree type),
1730 must_pass_in_stack_var_size_or_pad)
1732 /* Return true if type TYPE, mode MODE, which is passed by reference,
1733 should have the object copy generated by the callee rather than
1734 the caller. It is never called for TYPE requiring constructors. */
1739 (CUMULATIVE_ARGS *cum, enum machine_mode mode, const_tree type, bool named),
1740 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
1742 /* Return zero for arguments passed entirely on the stack or entirely
1743 in registers. If passed in both, return the number of bytes passed
1744 in registers; the balance is therefore passed on the stack. */
1748 int, (CUMULATIVE_ARGS *cum, enum machine_mode mode, tree type, bool named),
1749 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0)
1751 /* Update the state in CA to advance past an argument in the
1752 argument list. The values MODE, TYPE, and NAMED describe that
1754 /* ??? tm.texi still only describes the old macro. */
1756 (function_arg_advance,
1759 (CUMULATIVE_ARGS *ca, enum machine_mode mode, const_tree type, bool named),
1760 default_function_arg_advance)
1762 /* Return zero if the argument described by the state of CA should
1763 be placed on a stack, or a hard register in which to store the
1764 argument. The values MODE, TYPE, and NAMED describe that
1766 /* ??? tm.texi still only describes the old macro. */
1770 rtx, (const CUMULATIVE_ARGS *ca, enum machine_mode mode, const_tree type,
1772 default_function_arg)
1774 /* Likewise, but for machines with register windows. Return the
1775 location where the argument will appear to the callee. */
1776 /* ??? tm.texi still only describes the old macro. */
1778 (function_incoming_arg,
1780 rtx, (const CUMULATIVE_ARGS *ca, enum machine_mode mode, const_tree type,
1782 default_function_incoming_arg)
1784 /* Return the diagnostic message string if function without a prototype
1785 is not allowed for this 'val' argument; NULL otherwise. */
1787 (invalid_arg_for_unprototyped_fn,
1789 const char *, (const_tree typelist, const_tree funcdecl, const_tree val),
1790 hook_invalid_arg_for_unprototyped_fn)
1792 /* Return an rtx for the return value location of the function
1793 specified by FN_DECL_OR_TYPE with a return type of RET_TYPE. */
1797 rtx, (const_tree ret_type, const_tree fn_decl_or_type, bool outgoing),
1798 default_function_value)
1800 /* Return the rtx for the result of a libcall of mode MODE,
1801 calling the function FN_NAME. */
1805 rtx, (enum machine_mode mode, const_rtx fun),
1806 default_libcall_value)
1808 /* Return true if REGNO is a possible register number for
1809 a function value as seen by the caller. */
1811 (function_value_regno_p,
1813 bool, (const unsigned int regno),
1814 default_function_value_regno_p)
1816 /* ??? Documenting this hook requires a GFDL license grant. */
1818 (internal_arg_pointer,
1819 "Return an rtx for the argument pointer incoming to the\
1822 default_internal_arg_pointer)
1824 /* Update the current function stack boundary if needed. */
1826 (update_stack_boundary,
1830 /* Handle stack alignment and return an rtx for Dynamic Realign
1831 Argument Pointer if necessary. */
1837 /* Return true if all function parameters should be spilled to the
1840 (allocate_stack_slots_for_args,
1843 hook_bool_void_true)
1845 /* Return an rtx for the static chain for FNDECL. If INCOMING_P is true,
1846 then it should be for the callee; otherwise for the caller. */
1850 rtx, (const_tree fndecl, bool incoming_p),
1851 default_static_chain)
1853 /* Fill in the trampoline at MEM with a call to FNDECL and a
1854 static chain value of CHAIN. */
1858 void, (rtx m_tramp, tree fndecl, rtx static_chain),
1859 default_trampoline_init)
1861 /* Adjust the address of the trampoline in a target-specific way. */
1863 (trampoline_adjust_address,
1865 rtx, (rtx addr), NULL)
1867 /* Return the number of bytes of its own arguments that a function
1868 pops on returning, or 0 if the function pops no arguments and the
1869 caller must therefore pop them all after the function returns. */
1870 /* ??? tm.texi has no types for the parameters. */
1874 int, (tree fundecl, tree funtype, int size),
1875 default_return_pops_args)
1877 HOOK_VECTOR_END (calls)
1879 /* Return the diagnostic message string if conversion from FROMTYPE
1880 to TOTYPE is not allowed, NULL otherwise. */
1882 (invalid_conversion,
1884 const char *, (const_tree fromtype, const_tree totype),
1885 hook_constcharptr_const_tree_const_tree_null)
1887 /* Return the diagnostic message string if the unary operation OP is
1888 not permitted on TYPE, NULL otherwise. */
1892 const char *, (int op, const_tree type),
1893 hook_constcharptr_int_const_tree_null)
1895 /* Return the diagnostic message string if the binary operation OP
1896 is not permitted on TYPE1 and TYPE2, NULL otherwise. */
1900 const char *, (int op, const_tree type1, const_tree type2),
1901 hook_constcharptr_int_const_tree_const_tree_null)
1903 /* Return the diagnostic message string if TYPE is not valid as a
1904 function parameter type, NULL otherwise. */
1906 (invalid_parameter_type,
1908 const char *, (const_tree type),
1909 hook_constcharptr_const_tree_null)
1911 /* Return the diagnostic message string if TYPE is not valid as a
1912 function return type, NULL otherwise. */
1914 (invalid_return_type,
1916 const char *, (const_tree type),
1917 hook_constcharptr_const_tree_null)
1919 /* If values of TYPE are promoted to some other type when used in
1920 expressions (analogous to the integer promotions), return that type,
1921 or NULL_TREE otherwise. */
1925 tree, (const_tree type),
1926 hook_tree_const_tree_null)
1928 /* Convert EXPR to TYPE, if target-specific types with special conversion
1929 rules are involved. Return the converted expression, or NULL to apply
1930 the standard conversion rules. */
1934 tree, (tree type, tree expr),
1935 hook_tree_tree_tree_null)
1937 /* Return the array of IRA cover classes for the current target. */
1941 const enum reg_class *, (void),
1942 default_ira_cover_classes)
1944 /* Return the class for a secondary reload, and fill in extra information. */
1949 (bool in_p, rtx x, enum reg_class reload_class, enum machine_mode reload_mode,
1950 secondary_reload_info *sri),
1951 default_secondary_reload)
1953 /* This target hook allows the backend to perform additional
1954 processing while initializing for variable expansion. */
1956 (expand_to_rtl_hook,
1961 /* This target hook allows the backend to perform additional
1962 instantiations on rtx that are not actually in insns yet,
1963 but will be later. */
1970 /* Return true if is OK to use a hard register REGNO as scratch register
1973 (hard_regno_scratch_ok,
1975 bool, (unsigned int regno),
1976 default_hard_regno_scratch_ok)
1978 /* Return the smallest number of different values for which it is best to
1979 use a jump-table instead of a tree of conditional branches. */
1981 (case_values_threshold,
1983 unsigned int, (void),
1984 default_case_values_threshold)
1986 /* Retutn true if a function must have and use a frame pointer. */
1988 (frame_pointer_required,
1991 hook_bool_void_false)
1993 /* Returns true if the compiler is allowed to try to replace register number
1994 from-reg with register number to-reg. */
1998 bool, (const int from_reg, const int to_reg),
1999 hook_bool_const_int_const_int_true)
2001 /* Functions specific to the C family of frontends. */
2003 #define HOOK_PREFIX "TARGET_C_"
2004 HOOK_VECTOR (TARGET_C, c)
2006 /* ??? Documenting this hook requires a GFDL license grant. */
2009 "Return machine mode for non-standard constant literal suffix @var{c},\
2010 or VOIDmode if non-standard suffixes are unsupported.",
2011 enum machine_mode, (char c),
2012 default_mode_for_suffix)
2016 /* Functions specific to the C++ frontend. */
2018 #define HOOK_PREFIX "TARGET_CXX_"
2019 HOOK_VECTOR (TARGET_CXX, cxx)
2021 /* Return the integer type used for guard variables. */
2026 default_cxx_guard_type)
2028 /* Return true if only the low bit of the guard should be tested. */
2033 hook_bool_void_false)
2035 /* Returns the size of the array cookie for an array of type. */
2040 default_cxx_get_cookie_size)
2042 /* Returns true if the element size should be stored in the array cookie. */
2047 hook_bool_void_false)
2049 /* Allows backends to perform additional processing when
2050 deciding if a class should be exported or imported. */
2052 (import_export_class,
2054 int, (tree type, int import_export), NULL)
2056 /* Returns true if constructors and destructors return "this". */
2058 (cdtor_returns_this,
2061 hook_bool_void_false)
2063 /* Returns true if the key method for a class can be an inline
2064 function, so long as it is not declared inline in the class
2065 itself. Returning true is the behavior required by the Itanium C++ ABI. */
2067 (key_method_may_be_inline,
2070 hook_bool_void_true)
2073 (determine_class_data_visibility,
2074 "@var{decl} is a virtual table, virtual table table, typeinfo object,\
2075 or other similar implicit class data object that will be emitted with\
2076 external linkage in this translation unit. No ELF visibility has been\
2077 explicitly specified. If the target needs to specify a visibility\
2078 other than that of the containing class, use this hook to set\
2079 @code{DECL_VISIBILITY} and @code{DECL_VISIBILITY_SPECIFIED}.",
2083 /* Returns true (the default) if virtual tables and other
2084 similar implicit class data objects are always COMDAT if they
2085 have external linkage. If this hook returns false, then
2086 class data for classes whose virtual table will be emitted in
2087 only one translation unit will not be COMDAT. */
2089 (class_data_always_comdat,
2092 hook_bool_void_true)
2094 /* Returns true (the default) if the RTTI for the basic types,
2095 which is always defined in the C++ runtime, should be COMDAT;
2096 false if it should not be COMDAT. */
2098 (library_rtti_comdat,
2101 hook_bool_void_true)
2103 /* Returns true if __aeabi_atexit should be used to register static
2109 hook_bool_void_false)
2111 /* Returns true if target may use atexit in the same manner as
2112 __cxa_atexit to register static destructors. */
2114 (use_atexit_for_cxa_atexit,
2117 hook_bool_void_false)
2120 (adjust_class_at_definition,
2121 "@var{type} is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that has just\
2122 been defined. Use this hook to make adjustments to the class (eg, tweak\
2123 visibility or perform any other required target modifications).",
2127 HOOK_VECTOR_END (cxx)
2129 /* Functions and data for emulated TLS support. */
2131 #define HOOK_PREFIX "TARGET_EMUTLS_"
2132 HOOK_VECTOR (TARGET_EMUTLS, emutls)
2134 /* Name of the address and common functions. */
2138 const char *, "__builtin___emutls_get_address")
2143 const char *, "__builtin___emutls_register_common")
2145 /* Prefixes for proxy variable and template. */
2156 /* Prefixes for proxy variable and template. */
2167 /* Function to generate field definitions of the proxy variable. */
2171 tree, (tree type, tree *name),
2172 default_emutls_var_fields)
2174 /* Function to initialize a proxy variable. */
2178 tree, (tree var, tree decl, tree tmpl_addr),
2179 default_emutls_var_init)
2181 /* Whether we are allowed to alter the usual alignment of the
2188 /* Whether we can emit debug information for TLS vars. */
2190 (debug_form_tls_address,
2194 HOOK_VECTOR_END (emutls)
2197 #define HOOK_PREFIX "TARGET_OPTION_"
2198 HOOK_VECTOR (TARGET_OPTION_HOOKS, target_option_hooks)
2200 /* Function to validate the attribute((option(...))) strings or NULL. If
2201 the option is validated, it is assumed that DECL_FUNCTION_SPECIFIC will
2202 be filled in in the function decl node. */
2206 bool, (tree fndecl, tree name, tree args, int flags),
2207 default_target_option_valid_attribute_p)
2209 /* Function to save any extra target state in the target options structure. */
2213 void, (struct cl_target_option *ptr), NULL)
2215 /* Function to restore any extra target state from the target options
2220 void, (struct cl_target_option *ptr), NULL)
2222 /* Function to print any extra target state from the target options
2227 void, (FILE *file, int indent, struct cl_target_option *ptr), NULL)
2229 /* Function to parse arguments to be validated for #pragma option, and to
2230 change the state if the options are valid. If the first argument is
2231 NULL, the second argument specifies the default options to use. Return
2232 true if the options are valid, and set the current state. */
2233 /* ??? The documentation in tm.texi is incomplete. */
2237 bool, (tree args, tree pop_target),
2238 default_target_option_pragma_parse)
2240 /* Do option overrides for the target. */
2245 default_target_option_override)
2247 /* Function to determine if one function can inline another function. */
2249 #define HOOK_PREFIX "TARGET_"
2253 bool, (tree caller, tree callee),
2254 default_target_can_inline_p)
2256 HOOK_VECTOR_END (target_option)
2258 /* For targets that need to mark extra registers as live on entry to
2259 the function, they should define this target hook and set their
2260 bits in the bitmap passed in. */
2262 (extra_live_on_entry,
2264 void, (bitmap regs),
2267 /* Leave the boolean fields at the end. */
2269 /* True if unwinding tables should be generated by default. */
2271 (unwind_tables_default,
2275 /* True if arbitrary sections are supported. */
2277 (have_named_sections,
2281 /* True if we can create zeroed data by switching to a BSS section
2282 and then using ASM_OUTPUT_SKIP to allocate the space. */
2284 (have_switchable_bss_sections,
2288 /* True if "native" constructors and destructors are supported,
2289 false if we're using collect2 for the job. */
2295 /* True if thread-local storage is supported. */
2301 /* True if a small readonly data section is supported. */
2303 (have_srodata_section,
2307 /* True if EH frame info sections should be zero-terminated. */
2309 (terminate_dw2_eh_frame_info,
2313 /* True if #NO_APP should be emitted at the beginning of assembly output. */
2315 (asm_file_start_app_off,
2319 /* True if output_file_directive should be called for main_input_filename
2320 at the beginning of assembly output. */
2322 (asm_file_start_file_directive,
2327 (handle_pragma_extern_prefix,
2328 "True if @code{#pragma extern_prefix} is to be supported.",
2331 /* True if the target is allowed to reorder memory accesses unless
2332 synchronization is explicitly requested. */
2338 /* Returns true if we should generate exception tables for use with the
2339 ARM EABI. The effects the encoding of function exception specifications. */
2345 /* Leave the boolean fields at the end. */
2347 /* Empty macro arguments are undefined in C90, so use an empty macro. */
2348 #define C90_EMPTY_HACK
2349 /* Close the 'struct gcc_target' definition. */
2350 HOOK_VECTOR_END (C90_EMPTY_HACK)
2352 HOOK_VECTOR (TARGETCM_INITIALIZER, gcc_targetcm)
2354 /* Handle target switch CODE (an OPT_* value). ARG is the argument
2355 passed to the switch; it is NULL if no argument was. VALUE is the
2356 value of ARG if CODE specifies a UInteger option, otherwise it is
2357 1 if the positive form of the switch was used and 0 if the negative
2358 form was. Return true if the switch was valid. */
2362 bool, (size_t code, const char *arg, int value),
2363 default_handle_c_option)
2365 HOOK_VECTOR_END (C90_EMPTY_HACK)
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