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. */
163 /* ??? The documentation uses a different name for the hook argument EXP. */
165 (declare_constant_name,
167 void, (FILE *file, const char *name, const_tree exp, HOST_WIDE_INT size),
168 default_asm_declare_constant_name)
170 /* Emit a ttype table reference to a typeinfo object. */
177 /* Emit an assembler directive to set visibility for the symbol
178 associated with the tree decl. */
180 (assemble_visibility,
182 void, (tree decl, int visibility),
183 default_assemble_visibility)
185 /* Output the assembler code for entry to a function. */
189 void, (FILE *file, HOST_WIDE_INT size),
190 default_function_pro_epilogue)
192 /* Output the assembler code for end of prologue. */
194 (function_end_prologue,
199 /* Output the assembler code for start of epilogue. */
201 (function_begin_epilogue,
206 /* Output the assembler code for function exit. */
210 void, (FILE *file, HOST_WIDE_INT size),
211 default_function_pro_epilogue)
213 /* Initialize target-specific sections. */
220 /* Tell assembler to change to section NAME with attributes FLAGS.
221 If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with
222 which this section is associated. */
226 void, (const char *name, unsigned int flags, tree decl),
227 default_no_named_section)
229 /* Return a mask describing how relocations should be treated when
230 selecting sections. Bit 1 should be set if global relocations
231 should be placed in a read-write section; bit 0 should be set if
232 local relocations should be placed in a read-write section. */
237 default_reloc_rw_mask)
239 /* Return a section for EXP. It may be a DECL or a constant. RELOC
240 is nonzero if runtime relocations must be applied; bit 1 will be
241 set if the runtime relocations require non-local name resolution.
242 ALIGN is the required alignment of the data. */
246 section *, (tree exp, int reloc, unsigned HOST_WIDE_INT align),
247 default_select_section)
249 /* Return a section for X. MODE is X's mode and ALIGN is its
250 alignment in bits. */
254 section *, (enum machine_mode mode, rtx x, unsigned HOST_WIDE_INT align),
255 default_select_rtx_section)
257 /* Select a unique section name for DECL. RELOC is the same as
258 for SELECT_SECTION. */
262 void, (tree decl, int reloc),
263 default_unique_section)
265 /* Return the readonly data section associated with function DECL. */
267 (function_rodata_section,
269 section *, (tree decl),
270 default_function_rodata_section)
272 /* Output a constructor for a symbol with a given priority. */
276 void, (rtx symbol, int priority), NULL)
278 /* Output a destructor for a symbol with a given priority. */
282 void, (rtx symbol, int priority), NULL)
284 /* Output the assembler code for a thunk function. THUNK_DECL is the
285 declaration for the thunk function itself, FUNCTION is the decl for
286 the target function. DELTA is an immediate constant offset to be
287 added to THIS. If VCALL_OFFSET is nonzero, the word at
288 *(*this + vcall_offset) should be added to THIS. */
292 void, (FILE *file, tree thunk_fndecl, HOST_WIDE_INT delta,
293 HOST_WIDE_INT vcall_offset, tree function),
296 /* Determine whether output_mi_thunk would succeed. */
297 /* ??? Ideally, this hook would not exist, and success or failure
298 would be returned from output_mi_thunk directly. But there's
299 too much undo-able setup involved in invoking output_mi_thunk.
300 Could be fixed by making output_mi_thunk emit rtl instead of
301 text to the output file. */
303 (can_output_mi_thunk,
305 bool, (const_tree thunk_fndecl, HOST_WIDE_INT delta,
306 HOST_WIDE_INT vcall_offset, const_tree function),
307 hook_bool_const_tree_hwi_hwi_const_tree_false)
309 /* Output any boilerplate text needed at the beginning of a
317 /* Output any boilerplate text needed at the end of a translation unit. */
324 /* Output any boilerplate text needed at the beginning of an
325 LTO output stream. */
332 /* Output any boilerplate text needed at the end of an
333 LTO output stream. */
340 /* Output any boilerplace text needed at the end of a
341 translation unit before debug and unwind info is emitted. */
348 /* Output an assembler pseudo-op to declare a library function name
354 default_external_libcall)
356 /* Output an assembler directive to mark decl live. This instructs
357 linker to not dead code strip this symbol. */
359 (mark_decl_preserved,
361 void, (const char *symbol),
362 hook_void_constcharptr)
364 /* Output a record of the command line switches that have been passed. */
366 (record_gcc_switches,
368 int, (print_switch_type type, const char *text),
371 /* The name of the section that the example ELF implementation of
372 record_gcc_switches will use to store the information. Target
373 specific versions of record_gcc_switches may or may not use
376 (record_gcc_switches_section,
378 const char *, ".GCC.command.line")
380 /* Output the definition of a section anchor. */
385 default_asm_output_anchor)
387 /* Output a DTP-relative reference to a TLS symbol. */
389 (output_dwarf_dtprel,
391 void, (FILE *file, int size, rtx x),
394 /* Some target machines need to postscan each insn after it is output. */
396 (final_postscan_insn,
398 void, (FILE *file, rtx insn, rtx *opvec, int noperands),
401 /* Emit the trampoline template. This hook may be NULL. */
403 (trampoline_template,
408 /* ??? The TARGET_PRINT_OPERAND* hooks are part of the asm_out struct,
409 even though that is not reflected in the macro name to override their
412 #define HOOK_PREFIX "TARGET_"
414 /* Emit a machine-specific insn operand. */
415 /* ??? Documenting the argument types for this hook requires a GFDL
416 license grant. Also, the documentation documents this as a macro,
417 not a hook, and uses a different name for the hook argument FILE. */
421 void, (FILE *file, rtx x, int code),
422 default_print_operand)
424 /* Emit a machine-specific memory address. */
425 /* ??? Documenting the argument types for this hook requires a GFDL
426 license grant. Also, the documentation documents this as a macro,
427 not a hook, and uses different hook argument names. */
429 (print_operand_address,
431 void, (FILE *file, rtx addr),
432 default_print_operand_address)
434 /* Determine whether CODE is a valid punctuation character for the
435 `print_operand' hook. */
436 /* ??? Documenting the argument types for this hook requires a GFDL
437 license grant. Also, the documentation documents this as a macro,
440 (print_operand_punct_valid_p,
442 bool ,(unsigned char code),
443 default_print_operand_punct_valid_p)
445 HOOK_VECTOR_END (asm_out)
447 /* Functions relating to instruction scheduling. All of these
448 default to null pointers, which haifa-sched.c looks for and handles. */
450 #define HOOK_PREFIX "TARGET_SCHED_"
451 HOOK_VECTOR (TARGET_SCHED, sched)
453 /* Given the current cost, COST, of an insn, INSN, calculate and
454 return a new cost based on its relationship to DEP_INSN through
455 the dependence LINK. The default is to make no adjustment. */
459 int, (rtx insn, rtx link, rtx dep_insn, int cost), NULL)
461 /* Adjust the priority of an insn as you see fit. Returns the new priority. */
465 int, (rtx insn, int priority), NULL)
467 /* Function which returns the maximum number of insns that can be
468 scheduled in the same machine cycle. This must be constant
469 over an entire compilation. The default is 1. */
475 /* Calculate how much this insn affects how many more insns we
476 can emit this cycle. Default is they all cost the same. */
480 int, (FILE *file, int verbose, rtx insn, int more), NULL)
482 /* Initialize machine-dependent scheduling code. */
486 void, (FILE *file, int verbose, int max_ready), NULL)
488 /* Finalize machine-dependent scheduling code. */
492 void, (FILE *file, int verbose), NULL)
494 /* Initialize machine-dependent function wide scheduling code. */
498 void, (FILE *file, int verbose, int old_max_uid), NULL)
500 /* Finalize machine-dependent function wide scheduling code. */
504 void, (FILE *file, int verbose), NULL)
506 /* Reorder insns in a machine-dependent fashion, in two different
507 places. Default does nothing. */
511 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
516 int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
518 /* The following member value is a pointer to a function called
519 after evaluation forward dependencies of insns in chain given
520 by two parameter values (head and tail correspondingly). */
522 (dependencies_evaluation_hook,
524 void, (rtx head, rtx tail), NULL)
526 /* The values of the following four members are pointers to functions
527 used to simplify the automaton descriptions. dfa_pre_cycle_insn and
528 dfa_post_cycle_insn give functions returning insns which are used to
529 change the pipeline hazard recognizer state when the new simulated
530 processor cycle correspondingly starts and finishes. The function
531 defined by init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are
532 used to initialize the corresponding insns. The default values of
533 the members result in not changing the automaton state when the
534 new simulated processor cycle correspondingly starts and finishes. */
537 (init_dfa_pre_cycle_insn,
547 (init_dfa_post_cycle_insn,
552 (dfa_post_cycle_insn,
556 /* The values of the following two members are pointers to
557 functions used to simplify the automaton descriptions.
558 dfa_pre_advance_cycle and dfa_post_advance_cycle are getting called
559 immediately before and after cycle is advanced. */
562 (dfa_pre_advance_cycle,
567 (dfa_post_advance_cycle,
571 /* The following member value is a pointer to a function returning value
572 which defines how many insns in queue `ready' will we try for
573 multi-pass scheduling. If the member value is nonzero and the
574 function returns positive value, the DFA based scheduler will make
575 multi-pass scheduling for the first cycle. In other words, we will
576 try to choose ready insn which permits to start maximum number of
577 insns on the same cycle. */
579 (first_cycle_multipass_dfa_lookahead,
583 /* The following member value is pointer to a function controlling
584 what insns from the ready insn queue will be considered for the
585 multipass insn scheduling. If the hook returns zero for insn
586 passed as the parameter, the insn will be not chosen to be issued. */
588 (first_cycle_multipass_dfa_lookahead_guard,
590 int, (rtx insn), NULL)
592 /* The following member value is pointer to a function called by
593 the insn scheduler before issuing insn passed as the third
594 parameter on given cycle. If the hook returns nonzero, the
595 insn is not issued on given processors cycle. Instead of that,
596 the processor cycle is advanced. If the value passed through
597 the last parameter is zero, the insn ready queue is not sorted
598 on the new cycle start as usually. The first parameter passes
599 file for debugging output. The second one passes the scheduler
600 verbose level of the debugging output. The forth and the fifth
601 parameter values are correspondingly processor cycle on which
602 the previous insn has been issued and the current processor cycle. */
603 /* ??? The documentation uses different names for dump_file,
604 last_sched_cycle and cur_cycle. */
608 int, (FILE *dump_file, int verbose, rtx insn, int last_sched_cycle,
609 int cur_cycle, int *sort_p),
612 /* The following member value is a pointer to a function called by the
613 insn scheduler. It should return true if there exists a dependence
614 which is considered costly by the target, between the insn
615 DEP_PRO (&_DEP), and the insn DEP_CON (&_DEP). The first parameter is
616 the dep that represents the dependence between the two insns. The
617 second argument is the cost of the dependence as estimated by
618 the scheduler. The last argument is the distance in cycles
619 between the already scheduled insn (first parameter) and the
620 second insn (second parameter). */
622 (is_costly_dependence,
624 bool, (struct _dep *_dep, int cost, int distance), NULL)
628 "Given the current cost, @var{cost}, of an insn, @var{insn}, calculate and\
629 return a new cost based on its relationship to @var{dep_insn} through the\
630 dependence of weakness @var{dw}. The default is to make no adjustment.",
631 int, (rtx insn, int dep_type1, rtx dep_insn, int cost, int dw), NULL)
633 /* The following member value is a pointer to a function called
634 by the insn scheduler. This hook is called to notify the backend
635 that new instructions were emitted. */
641 /* Next 5 functions are for multi-point scheduling. */
643 /* Allocate memory for scheduler context. */
645 (alloc_sched_context,
647 void *, (void), NULL)
649 /* Fills the context from the local machine scheduler context. */
653 void, (void *tc, bool clean_p), NULL)
655 /* Sets local machine scheduler context to a saved value. */
659 void, (void *tc), NULL)
661 /* Clears a scheduler context so it becomes like after init. */
663 (clear_sched_context,
665 void, (void *tc), NULL)
667 /* Frees the scheduler context. */
671 void, (void *tc), NULL)
673 /* The following member value is a pointer to a function called
674 by the insn scheduler.
675 The first parameter is an instruction, the second parameter is the type
676 of the requested speculation, and the third parameter is a pointer to the
677 speculative pattern of the corresponding type (set if return value == 1).
679 -1, if there is no pattern, that will satisfy the requested speculation type,
680 0, if current pattern satisfies the requested speculation type,
681 1, if pattern of the instruction should be changed to the newly
686 int, (rtx insn, int request, rtx *new_pat), NULL)
688 /* The following member value is a pointer to a function called
689 by the insn scheduler. It should return true if the check instruction
690 passed as the parameter needs a recovery block. */
694 bool, (int dep_status), NULL)
696 /* The following member value is a pointer to a function called
697 by the insn scheduler. It should return a pattern for the check
699 The first parameter is a speculative instruction, the second parameter
700 is the label of the corresponding recovery block (or null, if it is a
701 simple check). If the mutation of the check is requested (e.g. from
702 ld.c to chk.a), the third parameter is true - in this case the first
703 parameter is the previous check. */
707 rtx, (rtx insn, rtx label, int mutate_p), NULL)
709 /* The following member value is a pointer to a function controlling
710 what insns from the ready insn queue will be considered for the
711 multipass insn scheduling. If the hook returns zero for the insn
712 passed as the parameter, the insn will not be chosen to be
713 issued. This hook is used to discard speculative instructions,
714 that stand at the first position of the ready list. */
716 (first_cycle_multipass_dfa_lookahead_guard_spec,
718 bool, (const_rtx insn), NULL)
720 /* The following member value is a pointer to a function that provides
721 information about the speculation capabilities of the target.
722 The parameter is a pointer to spec_info variable. */
726 void, (struct spec_info_def *spec_info), NULL)
730 "Return speculation types of instruction @var{insn}.",
731 int, (rtx insn), NULL)
734 (get_insn_checked_ds,
735 "Return speculation types that are checked for instruction @var{insn}",
736 int, (rtx insn), NULL)
740 "Return bool if rtx scanning should just skip current layer and\
741 advance to the inner rtxes.",
742 bool, (const_rtx x), NULL)
744 /* The following member value is a pointer to a function that provides
745 information about the target resource-based lower bound which is
746 used by the swing modulo scheduler. The parameter is a pointer
751 int, (struct ddg *g), NULL)
753 HOOK_VECTOR_END (sched)
755 /* Functions relating to vectorization. */
757 #define HOOK_PREFIX "TARGET_VECTORIZE_"
758 HOOK_VECTOR (TARGET_VECTORIZE, vectorize)
760 /* The following member value is a pointer to a function called
761 by the vectorizer, and return the decl of the target builtin
764 (builtin_mask_for_load,
768 /* Returns a code for builtin that realizes vectorized version of
769 function, or NULL_TREE if not available. */
771 (builtin_vectorized_function,
773 tree, (tree fndecl, tree vec_type_out, tree vec_type_in),
774 default_builtin_vectorized_function)
776 /* Returns a function declaration for a builtin that realizes the
777 vector conversion, or NULL_TREE if not available. */
781 tree, (unsigned code, tree dest_type, tree src_type),
782 default_builtin_vectorized_conversion)
784 /* Target builtin that implements vector widening multiplication.
785 builtin_mul_widen_eve computes the element-by-element products
786 for the even elements, and builtin_mul_widen_odd computes the
787 element-by-element products for the odd elements. */
789 (builtin_mul_widen_even,
791 tree, (tree x), NULL)
794 (builtin_mul_widen_odd,
796 tree, (tree x), NULL)
798 /* Cost of different vector/scalar statements in vectorization cost model. */
800 (builtin_vectorization_cost,
802 int, (enum vect_cost_for_stmt type_of_cost),
803 default_builtin_vectorization_cost)
805 /* Return true if vector alignment is reachable (by peeling N
806 iterations) for the given type. */
808 (vector_alignment_reachable,
810 bool, (const_tree type, bool is_packed),
811 default_builtin_vector_alignment_reachable)
813 /* Target builtin that implements vector permute. */
817 tree, (tree type, tree *mask_element_type), NULL)
819 /* Return true if a vector created for builtin_vec_perm is valid. */
821 (builtin_vec_perm_ok,
823 bool, (tree vec_type, tree mask),
824 hook_bool_tree_tree_true)
826 /* Return true if the target supports misaligned store/load of a
827 specific factor denoted in the third parameter. The last parameter
828 is true if the access is defined in a packed struct. */
830 (support_vector_misalignment,
833 (enum machine_mode mode, const_tree type, int misalignment, bool is_packed),
834 default_builtin_support_vector_misalignment)
836 HOOK_VECTOR_END (vectorize)
839 #define HOOK_PREFIX "TARGET_"
841 /* The initial value of target_flags. */
843 (default_target_flags,
847 /* Allow target specific overriding of option settings after options have
848 been changed by an attribute or pragma or when it is reset at the
849 end of the code affected by an attribute or pragma. */
851 (override_options_after_change,
856 /* Handle target switch CODE (an OPT_* value). ARG is the argument
857 passed to the switch; it is NULL if no argument was. VALUE is the
858 value of ARG if CODE specifies a UInteger option, otherwise it is
859 1 if the positive form of the switch was used and 0 if the negative
860 form was. Return true if the switch was valid. */
864 bool, (size_t code, const char *arg, int value),
865 hook_bool_size_t_constcharptr_int_true)
867 /* ??? Documenting this hook requires a GFDL license grant. */
870 "Handle target-specific parts of specifying -Ofast.",
874 /* Display extra, target specific information in response to a
875 --target-help switch. */
882 (eh_return_filter_mode,
883 "Return machine mode for filter value.",
884 enum machine_mode, (void),
885 default_eh_return_filter_mode)
887 /* Return machine mode for libgcc expanded cmp instructions. */
889 (libgcc_cmp_return_mode,
891 enum machine_mode, (void),
892 default_libgcc_cmp_return_mode)
894 /* Return machine mode for libgcc expanded shift instructions. */
896 (libgcc_shift_count_mode,
898 enum machine_mode, (void),
899 default_libgcc_shift_count_mode)
901 /* Return machine mode to be used for _Unwind_Word type. */
905 enum machine_mode, (void),
906 default_unwind_word_mode)
908 /* Given two decls, merge their attributes and return the result. */
910 (merge_decl_attributes,
912 tree, (tree olddecl, tree newdecl),
913 merge_decl_attributes)
915 /* Given two types, merge their attributes and return the result. */
917 (merge_type_attributes,
919 tree, (tree type1, tree type2),
920 merge_type_attributes)
922 /* Table of machine attributes and functions to handle them.
927 const struct attribute_spec *, NULL)
929 /* Return true iff attribute NAME expects a plain identifier as its first
932 (attribute_takes_identifier_p,
934 bool, (const_tree name),
935 hook_bool_const_tree_false)
937 /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
938 one if they are compatible and two if they are nearly compatible
939 (which causes a warning to be generated). */
941 (comp_type_attributes,
943 int, (const_tree type1, const_tree type2),
944 hook_int_const_tree_const_tree_1)
946 /* Assign default attributes to the newly defined TYPE. */
948 (set_default_type_attributes,
953 /* Insert attributes on the newly created DECL. */
957 void, (tree node, tree *attr_ptr),
958 hook_void_tree_treeptr)
960 /* Return true if FNDECL (which has at least one machine attribute)
961 can be inlined despite its machine attributes, false otherwise. */
963 (function_attribute_inlinable_p,
965 bool, (const_tree fndecl),
966 hook_bool_const_tree_false)
968 /* Return true if bitfields in RECORD_TYPE should follow the
969 Microsoft Visual C++ bitfield layout rules. */
971 (ms_bitfield_layout_p,
973 bool, (const_tree record_type),
974 hook_bool_const_tree_false)
976 /* True if the target supports decimal floating point. */
978 (decimal_float_supported_p,
981 default_decimal_float_supported_p)
983 /* True if the target supports fixed-point. */
985 (fixed_point_supported_p,
988 default_fixed_point_supported_p)
990 /* Return true if anonymous bitfields affect structure alignment. */
992 (align_anon_bitfield,
995 hook_bool_void_false)
997 /* Return true if volatile bitfields should use the narrowest type possible.
998 Return false if they should use the container type. */
1000 (narrow_volatile_bitfield,
1003 hook_bool_void_false)
1005 /* Set up target-specific built-in functions. */
1012 /* Initialize (if INITIALIZE_P is true) and return the target-specific
1013 built-in function decl for CODE.
1014 Return NULL if that is not possible. Return error_mark_node if CODE
1015 is outside of the range of valid target builtin function codes. */
1019 tree, (unsigned code, bool initialize_p), NULL)
1021 /* Expand a target-specific builtin. */
1026 (tree exp, rtx target, rtx subtarget, enum machine_mode mode, int ignore),
1027 default_expand_builtin)
1029 /* Select a replacement for a target-specific builtin. This is done
1030 *before* regular type checking, and so allows the target to
1031 implement a crude form of function overloading. The result is a
1032 complete expression that implements the operation. PARAMS really
1033 has type VEC(tree,gc)*, but we don't want to include tree.h here. */
1034 /* ??? params is called differently in the documentation, and we can't
1035 fix that because of GPL / GFDL incompatibility. */
1037 (resolve_overloaded_builtin,
1039 tree, (unsigned int /*location_t*/ loc, tree fndecl, void *params), NULL)
1041 /* Fold a target-specific builtin. */
1042 /* ??? The documentation uses a different name for nargs. */
1046 tree, (tree fndecl, int nargs, tree *argp, bool ignore),
1047 hook_tree_tree_int_treep_bool_null)
1049 /* Returns a code for a target-specific builtin that implements
1050 reciprocal of the function, or NULL_TREE if not available. */
1051 /* ??? The documentation uses a different name for tm_fn. */
1053 (builtin_reciprocal,
1055 tree, (unsigned fn, bool tm_fn, bool sqrt),
1056 default_builtin_reciprocal)
1058 /* For a vendor-specific TYPE, return a pointer to a statically-allocated
1059 string containing the C++ mangling for TYPE. In all other cases, return
1064 const char *, (const_tree type),
1065 hook_constcharptr_const_tree_null)
1067 /* Make any adjustments to libfunc names needed for this target. */
1074 /* Given a decl, a section name, and whether the decl initializer
1075 has relocs, choose attributes for the section. */
1076 /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */
1078 (section_type_flags,
1080 unsigned int, (tree decl, const char *name, int reloc),
1081 default_section_type_flags)
1083 /* True if new jumps cannot be created, to replace existing ones or
1084 not, at the current point in the compilation. */
1086 (cannot_modify_jumps_p,
1089 hook_bool_void_false)
1091 /* Return a register class for which branch target register
1092 optimizations should be applied. */
1094 (branch_target_register_class,
1096 enum reg_class, (void),
1097 default_branch_target_register_class)
1099 /* Return true if branch target register optimizations should include
1100 callee-saved registers that are not already live during the current
1101 function. AFTER_PE_GEN is true if prologues and epilogues have
1102 already been generated. */
1104 (branch_target_register_callee_saved,
1106 bool, (bool after_prologue_epilogue_gen),
1107 hook_bool_bool_false)
1109 /* Return true if the target supports conditional execution. */
1111 (have_conditional_execution,
1114 default_have_conditional_execution)
1116 /* Return a new value for loop unroll size. */
1118 (loop_unroll_adjust,
1120 unsigned, (unsigned nunroll, struct loop *loop),
1123 /* True if the constant X cannot be placed in the constant pool. */
1125 (cannot_force_const_mem,
1128 hook_bool_rtx_false)
1131 (cannot_copy_insn_p,
1132 "True if the insn @var{x} cannot be duplicated.",
1135 /* True if X is considered to be commutative. */
1139 bool, (const_rtx x, int outer_code),
1140 hook_bool_const_rtx_commutative_p)
1142 /* True if ADDR is an address-expression whose effect depends
1143 on the mode of the memory reference it is used in. */
1145 (mode_dependent_address_p,
1147 bool, (const_rtx addr),
1148 default_mode_dependent_address_p)
1150 /* Given an invalid address X for a given machine mode, try machine-specific
1151 ways to make it legitimate. Return X or an invalid address on failure. */
1153 (legitimize_address,
1155 rtx, (rtx x, rtx oldx, enum machine_mode mode),
1156 default_legitimize_address)
1158 /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */
1160 (delegitimize_address,
1163 delegitimize_mem_from_attrs)
1165 /* Given an address RTX, say whether it is valid. */
1167 (legitimate_address_p,
1169 bool, (enum machine_mode mode, rtx x, bool strict),
1170 default_legitimate_address_p)
1172 /* True if the given constant can be put into an object_block. */
1174 (use_blocks_for_constant_p,
1176 bool, (enum machine_mode mode, const_rtx x),
1177 hook_bool_mode_const_rtx_false)
1179 /* The minimum and maximum byte offsets for anchored addresses. */
1190 /* True if section anchors can be used to access the given symbol. */
1192 (use_anchors_for_symbol_p,
1194 bool, (const_rtx x),
1195 default_use_anchors_for_symbol_p)
1197 /* True if it is OK to do sibling call optimization for the specified
1198 call expression EXP. DECL will be the called function, or NULL if
1199 this is an indirect call. */
1201 (function_ok_for_sibcall,
1203 bool, (tree decl, tree exp),
1204 hook_bool_tree_tree_false)
1206 /* Establish appropriate back-end context for processing the function
1207 FNDECL. The argument might be NULL to indicate processing at top
1208 level, outside of any function scope. */
1210 (set_current_function,
1212 void, (tree decl), hook_void_tree)
1214 /* True if EXP should be placed in a "small data" section. */
1218 bool, (const_tree exp),
1219 hook_bool_const_tree_false)
1221 /* True if EXP names an object for which name resolution must resolve
1222 to the current executable or shared library. */
1226 bool, (const_tree exp),
1227 default_binds_local_p)
1229 /* Modify and return the identifier of a DECL's external name,
1230 originally identified by ID, as required by the target,
1231 (eg, append @nn to windows32 stdcall function names).
1232 The default is to return ID without modification. */
1234 (mangle_decl_assembler_name,
1236 tree, (tree decl, tree id),
1237 default_mangle_decl_assembler_name)
1239 /* Do something target-specific to record properties of the DECL into
1240 the associated SYMBOL_REF. */
1242 (encode_section_info,
1244 void, (tree decl, rtx rtl, int new_decl_p),
1245 default_encode_section_info)
1247 /* Undo the effects of encode_section_info on the symbol string. */
1249 (strip_name_encoding,
1251 const char *, (const char *name),
1252 default_strip_name_encoding)
1254 /* If shift optabs for MODE are known to always truncate the shift count,
1255 return the mask that they apply. Return 0 otherwise. */
1257 (shift_truncation_mask,
1259 unsigned HOST_WIDE_INT, (enum machine_mode mode),
1260 default_shift_truncation_mask)
1262 /* Return the number of divisions in the given MODE that should be present,
1263 so that it is profitable to turn the division into a multiplication by
1266 (min_divisions_for_recip_mul,
1268 unsigned int, (enum machine_mode mode),
1269 default_min_divisions_for_recip_mul)
1271 /* If the representation of integral MODE is such that values are
1272 always sign-extended to a wider mode MODE_REP then return
1273 SIGN_EXTEND. Return UNKNOWN otherwise. */
1274 /* Note that the return type ought to be RTX_CODE, but that's not
1275 necessarily defined at this point. */
1279 int, (enum machine_mode mode, enum machine_mode rep_mode),
1280 default_mode_rep_extended)
1282 /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */
1284 (valid_pointer_mode,
1286 bool, (enum machine_mode mode),
1287 default_valid_pointer_mode)
1289 /* Support for named address spaces. */
1291 #define HOOK_PREFIX "TARGET_ADDR_SPACE_"
1292 HOOK_VECTOR (TARGET_ADDR_SPACE_HOOKS, addr_space)
1294 /* MODE to use for a pointer into another address space. */
1298 enum machine_mode, (addr_space_t address_space),
1299 default_addr_space_pointer_mode)
1301 /* MODE to use for an address in another address space. */
1305 enum machine_mode, (addr_space_t address_space),
1306 default_addr_space_address_mode)
1308 /* True if MODE is valid for a pointer in __attribute__((mode("MODE")))
1309 in another address space. */
1311 (valid_pointer_mode,
1313 bool, (enum machine_mode mode, addr_space_t as),
1314 default_addr_space_valid_pointer_mode)
1316 /* True if an address is a valid memory address to a given named address
1317 space for a given mode. */
1319 (legitimate_address_p,
1321 bool, (enum machine_mode mode, rtx exp, bool strict, addr_space_t as),
1322 default_addr_space_legitimate_address_p)
1324 /* Return an updated address to convert an invalid pointer to a named
1325 address space to a valid one. If NULL_RTX is returned use machine
1326 independent methods to make the address valid. */
1328 (legitimize_address,
1330 rtx, (rtx x, rtx oldx, enum machine_mode mode, addr_space_t as),
1331 default_addr_space_legitimize_address)
1333 /* True if one named address space is a subset of another named address. */
1337 bool, (addr_space_t superset, addr_space_t subset),
1338 default_addr_space_subset_p)
1340 /* Function to convert an rtl expression from one address space to another. */
1344 rtx, (rtx op, tree from_type, tree to_type),
1345 default_addr_space_convert)
1347 HOOK_VECTOR_END (addr_space)
1350 #define HOOK_PREFIX "TARGET_"
1352 /* True if MODE is valid for the target. By "valid", we mean able to
1353 be manipulated in non-trivial ways. In particular, this means all
1354 the arithmetic is supported. */
1356 (scalar_mode_supported_p,
1358 bool, (enum machine_mode mode),
1359 default_scalar_mode_supported_p)
1361 /* Similarly for vector modes. "Supported" here is less strict. At
1362 least some operations are supported; need to check optabs or builtins
1363 for further details. */
1365 (vector_mode_supported_p,
1367 bool, (enum machine_mode mode),
1368 hook_bool_mode_false)
1370 /* Compute cost of moving data from a register of class FROM to one of
1373 (register_move_cost,
1375 int, (enum machine_mode mode, enum reg_class from, enum reg_class to),
1376 default_register_move_cost)
1378 /* Compute cost of moving registers to/from memory. */
1379 /* ??? Documenting the argument types for this hook requires a GFDL
1380 license grant. Also, the documentation uses a different name for RCLASS. */
1384 int, (enum machine_mode mode, enum reg_class rclass, bool in),
1385 default_memory_move_cost)
1387 /* True for MODE if the target expects that registers in this mode will
1388 be allocated to registers in a small register class. The compiler is
1389 allowed to use registers explicitly used in the rtl as spill registers
1390 but it should prevent extending the lifetime of these registers. */
1392 (small_register_classes_for_mode_p,
1394 bool, (enum machine_mode mode),
1395 hook_bool_mode_false)
1397 /* Compute a (partial) cost for rtx X. Return true if the complete
1398 cost has been computed, and false if subexpressions should be
1399 scanned. In either case, *TOTAL contains the cost result. */
1400 /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's
1401 not necessarily defined at this point. */
1405 bool, (rtx x, int code, int outer_code, int *total, bool speed),
1406 hook_bool_rtx_int_int_intp_bool_false)
1408 /* Compute the cost of X, used as an address. Never called with
1409 invalid addresses. */
1413 int, (rtx address, bool speed),
1414 default_address_cost)
1416 /* Return where to allocate pseudo for a given hard register initial value. */
1418 (allocate_initial_value,
1420 rtx, (rtx hard_reg), NULL)
1422 /* Return nonzero if evaluating UNSPEC[_VOLATILE] X might cause a trap.
1423 FLAGS has the same meaning as in rtlanal.c: may_trap_p_1. */
1427 int, (const_rtx x, unsigned flags),
1428 default_unspec_may_trap_p)
1430 /* Given a register, this hook should return a parallel of registers
1431 to represent where to find the register pieces. Define this hook
1432 if the register and its mode are represented in Dwarf in
1433 non-contiguous locations, or if the register should be
1434 represented in more than one register in Dwarf. Otherwise, this
1435 hook should return NULL_RTX. */
1437 (dwarf_register_span,
1442 /* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
1443 entries not corresponding directly to registers below
1444 FIRST_PSEUDO_REGISTER, this hook should generate the necessary
1445 code, given the address of the table. */
1447 (init_dwarf_reg_sizes_extra,
1449 void, (tree address),
1452 /* Fetch the fixed register(s) which hold condition codes, for
1453 targets where it makes sense to look for duplicate assignments to
1454 the condition codes. This should return true if there is such a
1455 register, false otherwise. The arguments should be set to the
1456 fixed register numbers. Up to two condition code registers are
1457 supported. If there is only one for this target, the int pointed
1458 at by the second argument should be set to -1. */
1460 (fixed_condition_code_regs,
1462 bool, (unsigned int *p1, unsigned int *p2),
1463 hook_bool_uintp_uintp_false)
1465 /* If two condition code modes are compatible, return a condition
1466 code mode which is compatible with both, such that a comparison
1467 done in the returned mode will work for both of the original
1468 modes. If the condition code modes are not compatible, return
1471 (cc_modes_compatible,
1473 enum machine_mode, (enum machine_mode m1, enum machine_mode m2),
1474 default_cc_modes_compatible)
1476 /* Do machine-dependent code transformations. Called just before
1477 delayed-branch scheduling. */
1479 (machine_dependent_reorg,
1483 /* Create the __builtin_va_list type. */
1485 (build_builtin_va_list,
1488 std_build_builtin_va_list)
1490 /* Enumerate the va list variants. */
1491 /* ??? The documentation gets the type of ptree wrong. */
1495 int, (int idx, const char **pname, tree *ptree),
1498 /* Get the cfun/fndecl calling abi __builtin_va_list type. */
1502 tree, (tree fndecl),
1505 /* Get the __builtin_va_list type dependent on input type. */
1507 (canonical_va_list_type,
1510 std_canonical_va_list_type)
1512 /* ??? Documenting this hook requires a GFDL license grant. */
1514 (expand_builtin_va_start,
1515 "Expand the @code{__builtin_va_start} builtin.",
1516 void, (tree valist, rtx nextarg), NULL)
1518 /* Gimplifies a VA_ARG_EXPR. */
1520 (gimplify_va_arg_expr,
1522 tree, (tree valist, tree type, gimple_seq *pre_p, gimple_seq *post_p),
1523 std_gimplify_va_arg_expr)
1525 /* Validity-checking routines for PCH files, target-specific.
1526 get_pch_validity returns a pointer to the data to be stored,
1527 and stores the size in its argument. pch_valid_p gets the same
1528 information back and returns NULL if the PCH is valid,
1529 or an error message if not. */
1533 void *, (size_t *sz),
1534 default_get_pch_validity)
1539 const char *, (const void *data, size_t sz),
1540 default_pch_valid_p)
1542 /* If nonnull, this function checks whether a PCH file with the
1543 given set of target flags can be used. It returns NULL if so,
1544 otherwise it returns an error message. */
1546 (check_pch_target_flags,
1548 const char *, (int pch_flags), NULL)
1550 /* True if the compiler should give an enum type only as many
1551 bytes as it takes to represent the range of possible values of
1554 (default_short_enums,
1557 hook_bool_void_false)
1559 /* This target hook returns an rtx that is used to store the address
1560 of the current frame into the built-in setjmp buffer. */
1562 (builtin_setjmp_frame_value,
1565 default_builtin_setjmp_frame_value)
1567 /* This target hook should add STRING_CST trees for any hard regs
1568 the port wishes to automatically clobber for an asm. */
1572 tree, (tree outputs, tree inputs, tree clobbers),
1573 hook_tree_tree_tree_tree_3rd_identity)
1575 /* This target hook allows the backend to specify a calling convention
1576 in the debug information. This function actually returns an
1577 enum dwarf_calling_convention, but because of forward declarations
1578 and not wanting to include dwarf2.h everywhere target.h is included
1579 the function is being declared as an int. */
1581 (dwarf_calling_convention,
1583 int, (const_tree function),
1584 hook_int_const_tree_0)
1586 /* This target hook allows the backend to emit frame-related insns that
1587 contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info
1588 engine will invoke it on insns of the form
1589 (set (reg) (unspec [...] UNSPEC_INDEX))
1591 (set (reg) (unspec_volatile [...] UNSPECV_INDEX))
1592 to let the backend emit the call frame instructions. */
1594 (dwarf_handle_frame_unspec,
1596 void, (const char *label, rtx pattern, int index), NULL)
1598 /* ??? Documenting this hook requires a GFDL license grant. */
1600 (stdarg_optimize_hook,
1601 "Perform architecture specific checking of statements gimplified\
1602 from @code{VA_ARG_EXPR}. @var{stmt} is the statement. Returns true if\
1603 the statement doesn't need to be checked for @code{va_list} references.",
1604 bool, (struct stdarg_info *ai, const_gimple stmt), NULL)
1606 /* This target hook allows the operating system to override the DECL
1607 that represents the external variable that contains the stack
1608 protection guard variable. The type of this DECL is ptr_type_node. */
1610 (stack_protect_guard,
1613 default_stack_protect_guard)
1615 /* This target hook allows the operating system to override the CALL_EXPR
1616 that is invoked when a check vs the guard variable fails. */
1618 (stack_protect_fail,
1621 default_external_stack_protect_fail)
1623 /* Returns NULL if target supports the insn within a doloop block,
1624 otherwise it returns an error message. */
1626 (invalid_within_doloop,
1628 const char *, (const_rtx insn),
1629 default_invalid_within_doloop)
1632 (valid_dllimport_attribute_p,
1633 "@var{decl} is a variable or function with @code{__attribute__((dllimport))}\
1634 specified. Use this hook if the target needs to add extra validation\
1635 checks to @code{handle_dll_attribute}.",
1636 bool, (const_tree decl),
1637 hook_bool_const_tree_true)
1639 /* If non-zero, align constant anchors in CSE to a multiple of this
1644 unsigned HOST_WIDE_INT, 0)
1646 /* Functions relating to calls - argument passing, returns, etc. */
1647 /* Members of struct call have no special macro prefix. */
1648 HOOK_VECTOR (TARGET_CALLS, calls)
1651 (promote_function_mode,
1653 enum machine_mode, (const_tree type, enum machine_mode mode, int *punsignedp,
1654 const_tree funtype, int for_return),
1655 default_promote_function_mode)
1658 (promote_prototypes,
1660 bool, (const_tree fntype),
1661 hook_bool_const_tree_false)
1666 rtx, (tree fndecl, int incoming),
1667 hook_rtx_tree_int_null)
1671 bool, (const_tree type, const_tree fntype),
1672 default_return_in_memory)
1677 bool, (const_tree type),
1678 hook_bool_const_tree_false)
1680 /* Return true if a parameter must be passed by reference. TYPE may
1681 be null if this is a libcall. CA may be null if this query is
1682 from __builtin_va_arg. */
1683 /* ??? The documentation disagrees on the type of 'type'. */
1688 (CUMULATIVE_ARGS *cum, enum machine_mode mode, const_tree type, bool named),
1689 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
1692 (expand_builtin_saveregs,
1695 default_expand_builtin_saveregs)
1697 /* Returns pretend_argument_size. */
1699 (setup_incoming_varargs,
1701 void, (CUMULATIVE_ARGS *args_so_far, enum machine_mode mode, tree type,
1702 int *pretend_args_size, int second_time),
1703 default_setup_incoming_varargs)
1706 (strict_argument_naming,
1708 bool, (CUMULATIVE_ARGS *ca),
1709 hook_bool_CUMULATIVE_ARGS_false)
1711 /* Returns true if we should use
1712 targetm.calls.setup_incoming_varargs() and/or
1713 targetm.calls.strict_argument_naming(). */
1715 (pretend_outgoing_varargs_named,
1717 bool, (CUMULATIVE_ARGS *ca),
1718 default_pretend_outgoing_varargs_named)
1720 /* Given a complex type T, return true if a parameter of type T
1721 should be passed as two scalars. */
1725 bool, (const_tree type), NULL)
1727 /* Return true if type T, mode MODE, may not be passed in registers,
1728 but must be passed on the stack. */
1729 /* ??? This predicate should be applied strictly after pass-by-reference.
1730 Need audit to verify that this is the case. */
1732 (must_pass_in_stack,
1734 bool, (enum machine_mode mode, const_tree type),
1735 must_pass_in_stack_var_size_or_pad)
1737 /* Return true if type TYPE, mode MODE, which is passed by reference,
1738 should have the object copy generated by the callee rather than
1739 the caller. It is never called for TYPE requiring constructors. */
1744 (CUMULATIVE_ARGS *cum, enum machine_mode mode, const_tree type, bool named),
1745 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
1747 /* Return zero for arguments passed entirely on the stack or entirely
1748 in registers. If passed in both, return the number of bytes passed
1749 in registers; the balance is therefore passed on the stack. */
1753 int, (CUMULATIVE_ARGS *cum, enum machine_mode mode, tree type, bool named),
1754 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0)
1756 /* Update the state in CA to advance past an argument in the
1757 argument list. The values MODE, TYPE, and NAMED describe that
1759 /* ??? tm.texi still only describes the old macro. */
1761 (function_arg_advance,
1764 (CUMULATIVE_ARGS *ca, enum machine_mode mode, const_tree type, bool named),
1765 default_function_arg_advance)
1767 /* Return zero if the argument described by the state of CA should
1768 be placed on a stack, or a hard register in which to store the
1769 argument. The values MODE, TYPE, and NAMED describe that
1771 /* ??? tm.texi still only describes the old macro. */
1775 rtx, (const CUMULATIVE_ARGS *ca, enum machine_mode mode, const_tree type,
1777 default_function_arg)
1779 /* Likewise, but for machines with register windows. Return the
1780 location where the argument will appear to the callee. */
1781 /* ??? tm.texi still only describes the old macro. */
1783 (function_incoming_arg,
1785 rtx, (const CUMULATIVE_ARGS *ca, enum machine_mode mode, const_tree type,
1787 default_function_incoming_arg)
1789 /* Return the diagnostic message string if function without a prototype
1790 is not allowed for this 'val' argument; NULL otherwise. */
1792 (invalid_arg_for_unprototyped_fn,
1794 const char *, (const_tree typelist, const_tree funcdecl, const_tree val),
1795 hook_invalid_arg_for_unprototyped_fn)
1797 /* Return an rtx for the return value location of the function
1798 specified by FN_DECL_OR_TYPE with a return type of RET_TYPE. */
1802 rtx, (const_tree ret_type, const_tree fn_decl_or_type, bool outgoing),
1803 default_function_value)
1805 /* Return the rtx for the result of a libcall of mode MODE,
1806 calling the function FN_NAME. */
1810 rtx, (enum machine_mode mode, const_rtx fun),
1811 default_libcall_value)
1813 /* Return true if REGNO is a possible register number for
1814 a function value as seen by the caller. */
1816 (function_value_regno_p,
1818 bool, (const unsigned int regno),
1819 default_function_value_regno_p)
1821 /* ??? Documenting this hook requires a GFDL license grant. */
1823 (internal_arg_pointer,
1824 "Return an rtx for the argument pointer incoming to the\
1827 default_internal_arg_pointer)
1829 /* Update the current function stack boundary if needed. */
1831 (update_stack_boundary,
1835 /* Handle stack alignment and return an rtx for Dynamic Realign
1836 Argument Pointer if necessary. */
1842 /* Return true if all function parameters should be spilled to the
1845 (allocate_stack_slots_for_args,
1848 hook_bool_void_true)
1850 /* Return an rtx for the static chain for FNDECL. If INCOMING_P is true,
1851 then it should be for the callee; otherwise for the caller. */
1855 rtx, (const_tree fndecl, bool incoming_p),
1856 default_static_chain)
1858 /* Fill in the trampoline at MEM with a call to FNDECL and a
1859 static chain value of CHAIN. */
1863 void, (rtx m_tramp, tree fndecl, rtx static_chain),
1864 default_trampoline_init)
1866 /* Adjust the address of the trampoline in a target-specific way. */
1868 (trampoline_adjust_address,
1870 rtx, (rtx addr), NULL)
1872 /* Return the number of bytes of its own arguments that a function
1873 pops on returning, or 0 if the function pops no arguments and the
1874 caller must therefore pop them all after the function returns. */
1875 /* ??? tm.texi has no types for the parameters. */
1879 int, (tree fundecl, tree funtype, int size),
1880 default_return_pops_args)
1882 HOOK_VECTOR_END (calls)
1884 /* Return the diagnostic message string if conversion from FROMTYPE
1885 to TOTYPE is not allowed, NULL otherwise. */
1887 (invalid_conversion,
1889 const char *, (const_tree fromtype, const_tree totype),
1890 hook_constcharptr_const_tree_const_tree_null)
1892 /* Return the diagnostic message string if the unary operation OP is
1893 not permitted on TYPE, NULL otherwise. */
1897 const char *, (int op, const_tree type),
1898 hook_constcharptr_int_const_tree_null)
1900 /* Return the diagnostic message string if the binary operation OP
1901 is not permitted on TYPE1 and TYPE2, NULL otherwise. */
1905 const char *, (int op, const_tree type1, const_tree type2),
1906 hook_constcharptr_int_const_tree_const_tree_null)
1908 /* Return the diagnostic message string if TYPE is not valid as a
1909 function parameter type, NULL otherwise. */
1911 (invalid_parameter_type,
1913 const char *, (const_tree type),
1914 hook_constcharptr_const_tree_null)
1916 /* Return the diagnostic message string if TYPE is not valid as a
1917 function return type, NULL otherwise. */
1919 (invalid_return_type,
1921 const char *, (const_tree type),
1922 hook_constcharptr_const_tree_null)
1924 /* If values of TYPE are promoted to some other type when used in
1925 expressions (analogous to the integer promotions), return that type,
1926 or NULL_TREE otherwise. */
1930 tree, (const_tree type),
1931 hook_tree_const_tree_null)
1933 /* Convert EXPR to TYPE, if target-specific types with special conversion
1934 rules are involved. Return the converted expression, or NULL to apply
1935 the standard conversion rules. */
1939 tree, (tree type, tree expr),
1940 hook_tree_tree_tree_null)
1942 /* Return the array of IRA cover classes for the current target. */
1946 const enum reg_class *, (void),
1947 default_ira_cover_classes)
1949 /* Return the class for a secondary reload, and fill in extra information. */
1954 (bool in_p, rtx x, enum reg_class reload_class, enum machine_mode reload_mode,
1955 secondary_reload_info *sri),
1956 default_secondary_reload)
1958 /* This target hook allows the backend to perform additional
1959 processing while initializing for variable expansion. */
1961 (expand_to_rtl_hook,
1966 /* This target hook allows the backend to perform additional
1967 instantiations on rtx that are not actually in insns yet,
1968 but will be later. */
1975 /* Return true if is OK to use a hard register REGNO as scratch register
1978 (hard_regno_scratch_ok,
1980 bool, (unsigned int regno),
1981 default_hard_regno_scratch_ok)
1983 /* Return the smallest number of different values for which it is best to
1984 use a jump-table instead of a tree of conditional branches. */
1986 (case_values_threshold,
1988 unsigned int, (void),
1989 default_case_values_threshold)
1991 /* Retutn true if a function must have and use a frame pointer. */
1993 (frame_pointer_required,
1996 hook_bool_void_false)
1998 /* Returns true if the compiler is allowed to try to replace register number
1999 from-reg with register number to-reg. */
2003 bool, (const int from_reg, const int to_reg),
2004 hook_bool_const_int_const_int_true)
2006 /* Functions specific to the C family of frontends. */
2008 #define HOOK_PREFIX "TARGET_C_"
2009 HOOK_VECTOR (TARGET_C, c)
2011 /* ??? Documenting this hook requires a GFDL license grant. */
2014 "Return machine mode for non-standard constant literal suffix @var{c},\
2015 or VOIDmode if non-standard suffixes are unsupported.",
2016 enum machine_mode, (char c),
2017 default_mode_for_suffix)
2021 /* Functions specific to the C++ frontend. */
2023 #define HOOK_PREFIX "TARGET_CXX_"
2024 HOOK_VECTOR (TARGET_CXX, cxx)
2026 /* Return the integer type used for guard variables. */
2031 default_cxx_guard_type)
2033 /* Return true if only the low bit of the guard should be tested. */
2038 hook_bool_void_false)
2040 /* Returns the size of the array cookie for an array of type. */
2045 default_cxx_get_cookie_size)
2047 /* Returns true if the element size should be stored in the array cookie. */
2052 hook_bool_void_false)
2054 /* Allows backends to perform additional processing when
2055 deciding if a class should be exported or imported. */
2057 (import_export_class,
2059 int, (tree type, int import_export), NULL)
2061 /* Returns true if constructors and destructors return "this". */
2063 (cdtor_returns_this,
2066 hook_bool_void_false)
2068 /* Returns true if the key method for a class can be an inline
2069 function, so long as it is not declared inline in the class
2070 itself. Returning true is the behavior required by the Itanium C++ ABI. */
2072 (key_method_may_be_inline,
2075 hook_bool_void_true)
2078 (determine_class_data_visibility,
2079 "@var{decl} is a virtual table, virtual table table, typeinfo object,\
2080 or other similar implicit class data object that will be emitted with\
2081 external linkage in this translation unit. No ELF visibility has been\
2082 explicitly specified. If the target needs to specify a visibility\
2083 other than that of the containing class, use this hook to set\
2084 @code{DECL_VISIBILITY} and @code{DECL_VISIBILITY_SPECIFIED}.",
2088 /* Returns true (the default) if virtual tables and other
2089 similar implicit class data objects are always COMDAT if they
2090 have external linkage. If this hook returns false, then
2091 class data for classes whose virtual table will be emitted in
2092 only one translation unit will not be COMDAT. */
2094 (class_data_always_comdat,
2097 hook_bool_void_true)
2099 /* Returns true (the default) if the RTTI for the basic types,
2100 which is always defined in the C++ runtime, should be COMDAT;
2101 false if it should not be COMDAT. */
2103 (library_rtti_comdat,
2106 hook_bool_void_true)
2108 /* Returns true if __aeabi_atexit should be used to register static
2114 hook_bool_void_false)
2116 /* Returns true if target may use atexit in the same manner as
2117 __cxa_atexit to register static destructors. */
2119 (use_atexit_for_cxa_atexit,
2122 hook_bool_void_false)
2125 (adjust_class_at_definition,
2126 "@var{type} is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that has just\
2127 been defined. Use this hook to make adjustments to the class (eg, tweak\
2128 visibility or perform any other required target modifications).",
2132 HOOK_VECTOR_END (cxx)
2134 /* Functions and data for emulated TLS support. */
2136 #define HOOK_PREFIX "TARGET_EMUTLS_"
2137 HOOK_VECTOR (TARGET_EMUTLS, emutls)
2139 /* Name of the address and common functions. */
2143 const char *, "__builtin___emutls_get_address")
2148 const char *, "__builtin___emutls_register_common")
2150 /* Prefixes for proxy variable and template. */
2161 /* Prefixes for proxy variable and template. */
2172 /* Function to generate field definitions of the proxy variable. */
2176 tree, (tree type, tree *name),
2177 default_emutls_var_fields)
2179 /* Function to initialize a proxy variable. */
2183 tree, (tree var, tree decl, tree tmpl_addr),
2184 default_emutls_var_init)
2186 /* Whether we are allowed to alter the usual alignment of the
2193 /* Whether we can emit debug information for TLS vars. */
2195 (debug_form_tls_address,
2199 HOOK_VECTOR_END (emutls)
2202 #define HOOK_PREFIX "TARGET_OPTION_"
2203 HOOK_VECTOR (TARGET_OPTION_HOOKS, target_option_hooks)
2205 /* Function to validate the attribute((option(...))) strings or NULL. If
2206 the option is validated, it is assumed that DECL_FUNCTION_SPECIFIC will
2207 be filled in in the function decl node. */
2211 bool, (tree fndecl, tree name, tree args, int flags),
2212 default_target_option_valid_attribute_p)
2214 /* Function to save any extra target state in the target options structure. */
2218 void, (struct cl_target_option *ptr), NULL)
2220 /* Function to restore any extra target state from the target options
2225 void, (struct cl_target_option *ptr), NULL)
2227 /* Function to print any extra target state from the target options
2232 void, (FILE *file, int indent, struct cl_target_option *ptr), NULL)
2234 /* Function to parse arguments to be validated for #pragma option, and to
2235 change the state if the options are valid. If the first argument is
2236 NULL, the second argument specifies the default options to use. Return
2237 true if the options are valid, and set the current state. */
2238 /* ??? The documentation disagrees on the signature of this hook. */
2242 bool, (tree args, tree pop_target),
2243 default_target_option_pragma_parse)
2245 /* Do option overrides for the target. */
2250 default_target_option_override)
2252 /* Function to determine if one function can inline another function. */
2254 #define HOOK_PREFIX "TARGET_"
2258 bool, (tree caller, tree callee),
2259 default_target_can_inline_p)
2261 HOOK_VECTOR_END (target_option)
2263 /* For targets that need to mark extra registers as live on entry to
2264 the function, they should define this target hook and set their
2265 bits in the bitmap passed in. */
2267 (extra_live_on_entry,
2269 void, (bitmap regs),
2272 /* Leave the boolean fields at the end. */
2274 /* True if unwinding tables should be generated by default. */
2276 (unwind_tables_default,
2280 /* True if arbitrary sections are supported. */
2282 (have_named_sections,
2286 /* True if we can create zeroed data by switching to a BSS section
2287 and then using ASM_OUTPUT_SKIP to allocate the space. */
2289 (have_switchable_bss_sections,
2293 /* True if "native" constructors and destructors are supported,
2294 false if we're using collect2 for the job. */
2300 /* True if thread-local storage is supported. */
2306 /* True if a small readonly data section is supported. */
2308 (have_srodata_section,
2312 /* True if EH frame info sections should be zero-terminated. */
2314 (terminate_dw2_eh_frame_info,
2318 /* True if #NO_APP should be emitted at the beginning of assembly output. */
2320 (asm_file_start_app_off,
2324 /* True if output_file_directive should be called for main_input_filename
2325 at the beginning of assembly output. */
2327 (asm_file_start_file_directive,
2332 (handle_pragma_extern_prefix,
2333 "True if @code{#pragma extern_prefix} is to be supported.",
2336 /* True if the target is allowed to reorder memory accesses unless
2337 synchronization is explicitly requested. */
2343 /* Returns true if we should generate exception tables for use with the
2344 ARM EABI. The effects the encoding of function exception specifications. */
2350 /* Leave the boolean fields at the end. */
2352 /* Empty macro arguments are undefined in C90, so use an empty macro. */
2353 #define C90_EMPTY_HACK
2354 /* Close the 'struct gcc_target' definition. */
2355 HOOK_VECTOR_END (C90_EMPTY_HACK)
2357 HOOK_VECTOR (TARGETCM_INITIALIZER, gcc_targetcm)
2359 /* Handle target switch CODE (an OPT_* value). ARG is the argument
2360 passed to the switch; it is NULL if no argument was. VALUE is the
2361 value of ARG if CODE specifies a UInteger option, otherwise it is
2362 1 if the positive form of the switch was used and 0 if the negative
2363 form was. Return true if the switch was valid. */
2367 bool, (size_t code, const char *arg, int value),
2368 default_handle_c_option)
2370 HOOK_VECTOR_END (C90_EMPTY_HACK)