1 /* Data structure definitions for a generic GCC target.
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! */
24 /* This file contains a data structure that describes a GCC target.
25 At present it is incomplete, but in future it should grow to
26 contain most or all target machine and target O/S specific
29 This structure has its initializer declared in target-def.h in the
30 form of large macro TARGET_INITIALIZER that expands to many smaller
33 The smaller macros each initialize one component of the structure,
34 and each has a default. Each target should have a file that
35 includes target.h and target-def.h, and overrides any inappropriate
36 defaults by undefining the relevant macro and defining a suitable
37 replacement. That file should then contain the definition of
40 struct gcc_target targetm = TARGET_INITIALIZER;
42 Doing things this way allows us to bring together everything that
43 defines a GCC target. By supplying a default that is appropriate
44 to most targets, we can easily add new items without needing to
45 edit dozens of target configuration files. It should also allow us
46 to gradually reduce the amount of conditional compilation that is
47 scattered throughout GCC. */
53 #include "insn-modes.h"
55 /* Types used by the record_gcc_switches() target function. */
58 SWITCH_TYPE_PASSED, /* A switch passed on the command line. */
59 SWITCH_TYPE_ENABLED, /* An option that is currently enabled. */
60 SWITCH_TYPE_DESCRIPTIVE, /* Descriptive text, not a switch or option. */
61 SWITCH_TYPE_LINE_START, /* Please emit any necessary text at the start of a line. */
62 SWITCH_TYPE_LINE_END /* Please emit a line terminator. */
66 typedef int (* print_switch_fn_type) (print_switch_type, const char *);
68 /* An example implementation for ELF targets. Defined in varasm.c */
69 extern int elf_record_gcc_switches (print_switch_type type, const char *);
71 /* Some places still assume that all pointer or address modes are the
72 standard Pmode and ptr_mode. These optimizations become invalid if
73 the target actually supports multiple different modes. For now,
74 we disable such optimizations on such targets, using this function. */
75 extern bool target_default_pointer_address_modes_p (void);
80 /* The struct used by the secondary_reload target hook. */
81 typedef struct secondary_reload_info
83 /* icode is actually an enum insn_code, but we don't want to force every
84 file that includes target.h to include optabs.h . */
86 int extra_cost; /* Cost for using (a) scratch register(s) to be taken
87 into account by copy_cost. */
88 /* The next two members are for the use of the backward
89 compatibility hook. */
90 struct secondary_reload_info *prev_sri;
91 int t_icode; /* Actually an enum insn_code - see above. */
92 } secondary_reload_info;
94 /* This is defined in sched-int.h . */
97 /* This is defined in ddg.h . */
100 /* This is defined in cfgloop.h . */
103 /* Assembler instructions for creating various kinds of integer object. */
113 /* Types of costs for vectorizer cost model. */
114 enum vect_cost_for_stmt
125 cond_branch_not_taken,
130 /* The target structure. This holds all the backend hooks. */
134 /* Functions that output assembler for the target. */
137 /* Opening and closing parentheses for asm expression grouping. */
138 const char *open_paren, *close_paren;
140 /* Assembler instructions for creating various kinds of integer object. */
142 struct asm_int_op aligned_op, unaligned_op;
144 /* Try to output the assembler code for an integer object whose
145 value is given by X. SIZE is the size of the object in bytes and
146 ALIGNED_P indicates whether it is aligned. Return true if
147 successful. Only handles cases for which BYTE_OP, ALIGNED_OP
148 and UNALIGNED_OP are NULL. */
149 bool (* integer) (rtx x, unsigned int size, int aligned_p);
151 /* Output code that will globalize a label. */
152 void (* globalize_label) (FILE *, const char *);
154 /* Output code that will globalize a declaration. */
155 void (* globalize_decl_name) (FILE *, tree);
157 /* Output code that will emit a label for unwind info, if this
158 target requires such labels. Second argument is the decl the
159 unwind info is associated with, third is a boolean: true if
160 this is for exception handling, fourth is a boolean: true if
161 this is only a placeholder for an omitted FDE. */
162 void (* unwind_label) (FILE *, tree, int, int);
164 /* Output code that will emit a label to divide up the exception
166 void (* except_table_label) (FILE *);
168 /* Emit any directives required to unwind this instruction. */
169 void (* unwind_emit) (FILE *, rtx);
171 /* Output an internal label. */
172 void (* internal_label) (FILE *, const char *, unsigned long);
174 /* Emit a ttype table reference to a typeinfo object. */
175 bool (* ttype) (rtx);
177 /* Emit an assembler directive to set visibility for the symbol
178 associated with the tree decl. */
179 void (* visibility) (tree, int);
181 /* Output the assembler code for entry to a function. */
182 void (* function_prologue) (FILE *, HOST_WIDE_INT);
184 /* Output the assembler code for end of prologue. */
185 void (* function_end_prologue) (FILE *);
187 /* Output the assembler code for start of epilogue. */
188 void (* function_begin_epilogue) (FILE *);
190 /* Output the assembler code for function exit. */
191 void (* function_epilogue) (FILE *, HOST_WIDE_INT);
193 /* Initialize target-specific sections. */
194 void (* init_sections) (void);
196 /* Tell assembler to change to section NAME with attributes FLAGS.
197 If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with
198 which this section is associated. */
199 void (* named_section) (const char *name, unsigned int flags, tree decl);
201 /* Return a mask describing how relocations should be treated when
202 selecting sections. Bit 1 should be set if global relocations
203 should be placed in a read-write section; bit 0 should be set if
204 local relocations should be placed in a read-write section. */
205 int (*reloc_rw_mask) (void);
207 /* Return a section for EXP. It may be a DECL or a constant. RELOC
208 is nonzero if runtime relocations must be applied; bit 1 will be
209 set if the runtime relocations require non-local name resolution.
210 ALIGN is the required alignment of the data. */
211 section *(* select_section) (tree, int, unsigned HOST_WIDE_INT);
213 /* Return a section for X. MODE is X's mode and ALIGN is its
214 alignment in bits. */
215 section *(* select_rtx_section) (enum machine_mode, rtx,
216 unsigned HOST_WIDE_INT);
218 /* Select a unique section name for DECL. RELOC is the same as
219 for SELECT_SECTION. */
220 void (* unique_section) (tree, int);
222 /* Return the readonly data section associated with function DECL. */
223 section *(* function_rodata_section) (tree);
225 /* Output a constructor for a symbol with a given priority. */
226 void (* constructor) (rtx, int);
228 /* Output a destructor for a symbol with a given priority. */
229 void (* destructor) (rtx, int);
231 /* Output the assembler code for a thunk function. THUNK_DECL is the
232 declaration for the thunk function itself, FUNCTION is the decl for
233 the target function. DELTA is an immediate constant offset to be
234 added to THIS. If VCALL_OFFSET is nonzero, the word at
235 *(*this + vcall_offset) should be added to THIS. */
236 void (* output_mi_thunk) (FILE *file, tree thunk_decl,
237 HOST_WIDE_INT delta, HOST_WIDE_INT vcall_offset,
240 /* Determine whether output_mi_thunk would succeed. */
241 /* ??? Ideally, this hook would not exist, and success or failure
242 would be returned from output_mi_thunk directly. But there's
243 too much undo-able setup involved in invoking output_mi_thunk.
244 Could be fixed by making output_mi_thunk emit rtl instead of
245 text to the output file. */
246 bool (* can_output_mi_thunk) (const_tree thunk_decl, HOST_WIDE_INT delta,
247 HOST_WIDE_INT vcall_offset,
248 const_tree function_decl);
250 /* Output any boilerplate text needed at the beginning of a
252 void (*file_start) (void);
254 /* Output any boilerplate text needed at the end of a
256 void (*file_end) (void);
258 /* Output any boilerplate text needed at the beginning of an
259 LTO output stream. */
260 void (*lto_start) (void);
262 /* Output any boilerplate text needed at the end of an
263 LTO output stream. */
264 void (*lto_end) (void);
266 /* Output any boilerplace text needed at the end of a
267 translation unit before debug and unwind info is emitted. */
268 void (*code_end) (void);
270 /* Output an assembler pseudo-op to declare a library function name
272 void (*external_libcall) (rtx);
274 /* Output an assembler directive to mark decl live. This instructs
275 linker to not dead code strip this symbol. */
276 void (*mark_decl_preserved) (const char *);
278 /* Output a record of the command line switches that have been passed. */
279 print_switch_fn_type record_gcc_switches;
280 /* The name of the section that the example ELF implementation of
281 record_gcc_switches will use to store the information. Target
282 specific versions of record_gcc_switches may or may not use
284 const char * record_gcc_switches_section;
286 /* Output the definition of a section anchor. */
287 void (*output_anchor) (rtx);
289 /* Output a DTP-relative reference to a TLS symbol. */
290 void (*output_dwarf_dtprel) (FILE *file, int size, rtx x);
292 /* Some target machines need to postscan each insn after it is output. */
293 void (*final_postscan_insn) (FILE *, rtx, rtx *, int);
295 /* Emit the trampoline template. This hook may be NULL. */
296 void (*trampoline_template) (FILE *);
298 /* Emit a machine-specific insn operand. */
299 void (*print_operand) (FILE *, rtx, int);
301 /* Emit a machine-specific memory address. */
302 void (*print_operand_address) (FILE *, rtx);
304 /* Determine whether CODE is a valid punctuation character for the
305 `print_operand' hook. */
306 bool (*print_operand_punct_valid_p)(unsigned char code);
309 /* Functions relating to instruction scheduling. */
312 /* Given the current cost, COST, of an insn, INSN, calculate and
313 return a new cost based on its relationship to DEP_INSN through
314 the dependence LINK. The default is to make no adjustment. */
315 int (* adjust_cost) (rtx insn, rtx link, rtx dep_insn, int cost);
317 /* Adjust the priority of an insn as you see fit. Returns the new
319 int (* adjust_priority) (rtx, int);
321 /* Function which returns the maximum number of insns that can be
322 scheduled in the same machine cycle. This must be constant
323 over an entire compilation. The default is 1. */
324 int (* issue_rate) (void);
326 /* Calculate how much this insn affects how many more insns we
327 can emit this cycle. Default is they all cost the same. */
328 int (* variable_issue) (FILE *, int, rtx, int);
330 /* Initialize machine-dependent scheduling code. */
331 void (* md_init) (FILE *, int, int);
333 /* Finalize machine-dependent scheduling code. */
334 void (* md_finish) (FILE *, int);
336 /* Initialize machine-dependent function wide scheduling code. */
337 void (* md_init_global) (FILE *, int, int);
339 /* Finalize machine-dependent function wide scheduling code. */
340 void (* md_finish_global) (FILE *, int);
342 /* Reorder insns in a machine-dependent fashion, in two different
343 places. Default does nothing. */
344 int (* reorder) (FILE *, int, rtx *, int *, int);
345 int (* reorder2) (FILE *, int, rtx *, int *, int);
347 /* The following member value is a pointer to a function called
348 after evaluation forward dependencies of insns in chain given
349 by two parameter values (head and tail correspondingly). */
350 void (* dependencies_evaluation_hook) (rtx, rtx);
352 /* The values of the following four members are pointers to
353 functions used to simplify the automaton descriptions.
354 dfa_pre_cycle_insn and dfa_post_cycle_insn give functions
355 returning insns which are used to change the pipeline hazard
356 recognizer state when the new simulated processor cycle
357 correspondingly starts and finishes. The function defined by
358 init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are used
359 to initialize the corresponding insns. The default values of
360 the members result in not changing the automaton state when
361 the new simulated processor cycle correspondingly starts and
363 void (* init_dfa_pre_cycle_insn) (void);
364 rtx (* dfa_pre_cycle_insn) (void);
365 void (* init_dfa_post_cycle_insn) (void);
366 rtx (* dfa_post_cycle_insn) (void);
368 /* The values of the following two members are pointers to
369 functions used to simplify the automaton descriptions.
370 dfa_pre_advance_cycle and dfa_post_advance_cycle are getting called
371 immediately before and after cycle is advanced. */
372 void (* dfa_pre_advance_cycle) (void);
373 void (* dfa_post_advance_cycle) (void);
375 /* The following member value is a pointer to a function returning value
376 which defines how many insns in queue `ready' will we try for
377 multi-pass scheduling. If the member value is nonzero and the
378 function returns positive value, the DFA based scheduler will make
379 multi-pass scheduling for the first cycle. In other words, we will
380 try to choose ready insn which permits to start maximum number of
381 insns on the same cycle. */
382 int (* first_cycle_multipass_dfa_lookahead) (void);
384 /* The following member value is pointer to a function controlling
385 what insns from the ready insn queue will be considered for the
386 multipass insn scheduling. If the hook returns zero for insn
387 passed as the parameter, the insn will be not chosen to be
389 int (* first_cycle_multipass_dfa_lookahead_guard) (rtx);
391 /* The following member value is pointer to a function called by
392 the insn scheduler before issuing insn passed as the third
393 parameter on given cycle. If the hook returns nonzero, the
394 insn is not issued on given processors cycle. Instead of that,
395 the processor cycle is advanced. If the value passed through
396 the last parameter is zero, the insn ready queue is not sorted
397 on the new cycle start as usually. The first parameter passes
398 file for debugging output. The second one passes the scheduler
399 verbose level of the debugging output. The forth and the fifth
400 parameter values are correspondingly processor cycle on which
401 the previous insn has been issued and the current processor
403 int (* dfa_new_cycle) (FILE *, int, rtx, int, int, int *);
405 /* The following member value is a pointer to a function called by the
406 insn scheduler. It should return true if there exists a dependence
407 which is considered costly by the target, between the insn
408 DEP_PRO (&_DEP), and the insn DEP_CON (&_DEP). The first parameter is
409 the dep that represents the dependence between the two insns. The
410 second argument is the cost of the dependence as estimated by
411 the scheduler. The last argument is the distance in cycles
412 between the already scheduled insn (first parameter) and the
413 second insn (second parameter). */
414 bool (* is_costly_dependence) (struct _dep *_dep, int, int);
416 /* Given the current cost, COST, of an insn, INSN, calculate and
417 return a new cost based on its relationship to DEP_INSN through the
418 dependence of type DEP_TYPE. The default is to make no adjustment. */
419 int (* adjust_cost_2) (rtx insn, int, rtx dep_insn, int cost, int dw);
421 /* The following member value is a pointer to a function called
422 by the insn scheduler. This hook is called to notify the backend
423 that new instructions were emitted. */
424 void (* h_i_d_extended) (void);
426 /* Next 5 functions are for multi-point scheduling. */
428 /* Allocate memory for scheduler context. */
429 void *(* alloc_sched_context) (void);
431 /* Fills the context from the local machine scheduler context. */
432 void (* init_sched_context) (void *, bool);
434 /* Sets local machine scheduler context to a saved value. */
435 void (* set_sched_context) (void *);
437 /* Clears a scheduler context so it becomes like after init. */
438 void (* clear_sched_context) (void *);
440 /* Frees the scheduler context. */
441 void (* free_sched_context) (void *);
443 /* The following member value is a pointer to a function called
444 by the insn scheduler.
445 The first parameter is an instruction, the second parameter is the type
446 of the requested speculation, and the third parameter is a pointer to the
447 speculative pattern of the corresponding type (set if return value == 1).
449 -1, if there is no pattern, that will satisfy the requested speculation
451 0, if current pattern satisfies the requested speculation type,
452 1, if pattern of the instruction should be changed to the newly
454 int (* speculate_insn) (rtx, int, rtx *);
456 /* The following member value is a pointer to a function called
457 by the insn scheduler. It should return true if the check instruction
458 passed as the parameter needs a recovery block. */
459 bool (* needs_block_p) (int);
461 /* The following member value is a pointer to a function called
462 by the insn scheduler. It should return a pattern for the check
464 The first parameter is a speculative instruction, the second parameter
465 is the label of the corresponding recovery block (or null, if it is a
466 simple check). If the mutation of the check is requested (e.g. from
467 ld.c to chk.a), the third parameter is true - in this case the first
468 parameter is the previous check. */
469 rtx (* gen_spec_check) (rtx, rtx, int);
471 /* The following member value is a pointer to a function controlling
472 what insns from the ready insn queue will be considered for the
473 multipass insn scheduling. If the hook returns zero for the insn
474 passed as the parameter, the insn will not be chosen to be
475 issued. This hook is used to discard speculative instructions,
476 that stand at the first position of the ready list. */
477 bool (* first_cycle_multipass_dfa_lookahead_guard_spec) (const_rtx);
479 /* The following member value is a pointer to a function that provides
480 information about the speculation capabilities of the target.
481 The parameter is a pointer to spec_info variable. */
482 void (* set_sched_flags) (struct spec_info_def *);
484 /* Return speculation types of the instruction passed as the parameter. */
485 int (* get_insn_spec_ds) (rtx);
487 /* Return speculation types that are checked for the instruction passed as
489 int (* get_insn_checked_ds) (rtx);
491 /* Return bool if rtx scanning should just skip current layer and
492 advance to the inner rtxes. */
493 bool (* skip_rtx_p) (const_rtx);
495 /* The following member value is a pointer to a function that provides
496 information about the target resource-based lower bound which is
497 used by the swing modulo scheduler. The parameter is a pointer
499 int (* sms_res_mii) (struct ddg *);
502 /* Functions relating to vectorization. */
505 /* The following member value is a pointer to a function called
506 by the vectorizer, and return the decl of the target builtin
508 tree (* builtin_mask_for_load) (void);
510 /* Returns a code for builtin that realizes vectorized version of
511 function, or NULL_TREE if not available. */
512 tree (* builtin_vectorized_function) (tree, tree, tree);
514 /* Returns a function declaration for a builtin that realizes the
515 vector conversion, or NULL_TREE if not available. */
516 tree (* builtin_conversion) (unsigned, tree, tree);
518 /* Target builtin that implements vector widening multiplication.
519 builtin_mul_widen_eve computes the element-by-element products
520 for the even elements, and builtin_mul_widen_odd computes the
521 element-by-element products for the odd elements. */
522 tree (* builtin_mul_widen_even) (tree);
523 tree (* builtin_mul_widen_odd) (tree);
525 /* Cost of different vector/scalar statements in vectorization cost
527 int (* builtin_vectorization_cost) (enum vect_cost_for_stmt);
529 /* Return true if vector alignment is reachable (by peeling N
530 iterations) for the given type. */
531 bool (* vector_alignment_reachable) (const_tree, bool);
533 /* Target builtin that implements vector permute. */
534 tree (* builtin_vec_perm) (tree, tree*);
536 /* Return true if a vector created for builtin_vec_perm is valid. */
537 bool (* builtin_vec_perm_ok) (tree, tree);
539 /* Return true if the target supports misaligned store/load of a
540 specific factor denoted in the third parameter. The last parameter
541 is true if the access is defined in a packed struct. */
542 bool (* builtin_support_vector_misalignment) (enum machine_mode,
543 const_tree, int, bool);
546 /* The initial value of target_flags. */
547 int default_target_flags;
549 /* Allow target specific overriding of option settings after options have
550 been changed by an attribute or pragma or when it is reset at the
551 end of the code affected by an attribute or pragma. */
552 void (* override_options_after_change) (void);
554 /* Handle target switch CODE (an OPT_* value). ARG is the argument
555 passed to the switch; it is NULL if no argument was. VALUE is the
556 value of ARG if CODE specifies a UInteger option, otherwise it is
557 1 if the positive form of the switch was used and 0 if the negative
558 form was. Return true if the switch was valid. */
559 bool (* handle_option) (size_t code, const char *arg, int value);
561 /* Handle target-specific parts of specifying -Ofast. */
562 void (* handle_ofast) (void);
564 /* Display extra, target specific information in response to a
565 --target-help switch. */
566 void (* target_help) (void);
568 /* Return machine mode for filter value. */
569 enum machine_mode (* eh_return_filter_mode) (void);
571 /* Return machine mode for libgcc expanded cmp instructions. */
572 enum machine_mode (* libgcc_cmp_return_mode) (void);
574 /* Return machine mode for libgcc expanded shift instructions. */
575 enum machine_mode (* libgcc_shift_count_mode) (void);
577 /* Return machine mode to be used for _Unwind_Word type. */
578 enum machine_mode (* unwind_word_mode) (void);
580 /* Given two decls, merge their attributes and return the result. */
581 tree (* merge_decl_attributes) (tree, tree);
583 /* Given two types, merge their attributes and return the result. */
584 tree (* merge_type_attributes) (tree, tree);
586 /* Table of machine attributes and functions to handle them.
588 const struct attribute_spec *attribute_table;
590 /* Return true iff attribute NAME expects a plain identifier as its first
592 bool (*attribute_takes_identifier_p) (const_tree name);
594 /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
595 one if they are compatible and two if they are nearly compatible
596 (which causes a warning to be generated). */
597 int (* comp_type_attributes) (const_tree type1, const_tree type2);
599 /* Assign default attributes to the newly defined TYPE. */
600 void (* set_default_type_attributes) (tree type);
602 /* Insert attributes on the newly created DECL. */
603 void (* insert_attributes) (tree decl, tree *attributes);
605 /* Return true if FNDECL (which has at least one machine attribute)
606 can be inlined despite its machine attributes, false otherwise. */
607 bool (* function_attribute_inlinable_p) (const_tree fndecl);
609 /* Return true if bitfields in RECORD_TYPE should follow the
610 Microsoft Visual C++ bitfield layout rules. */
611 bool (* ms_bitfield_layout_p) (const_tree record_type);
613 /* True if the target supports decimal floating point. */
614 bool (* decimal_float_supported_p) (void);
616 /* True if the target supports fixed-point. */
617 bool (* fixed_point_supported_p) (void);
619 /* Return true if anonymous bitfields affect structure alignment. */
620 bool (* align_anon_bitfield) (void);
622 /* Return true if volatile bitfields should use the narrowest type possible.
623 Return false if they should use the container type. */
624 bool (* narrow_volatile_bitfield) (void);
626 /* Set up target-specific built-in functions. */
627 void (* init_builtins) (void);
629 /* Initialize (if INITIALIZE_P is true) and return the target-specific
630 built-in function decl for CODE.
631 Return NULL if that is not possible. Return error_mark_node if CODE
632 is outside of the range of valid target builtin function codes. */
633 tree (* builtin_decl) (unsigned code, bool initialize_p);
635 /* Expand a target-specific builtin. */
636 rtx (* expand_builtin) (tree exp, rtx target, rtx subtarget,
637 enum machine_mode mode, int ignore);
639 /* Select a replacement for a target-specific builtin. This is done
640 *before* regular type checking, and so allows the target to
641 implement a crude form of function overloading. The result is a
642 complete expression that implements the operation. PARAMS really
643 has type VEC(tree,gc)*, but we don't want to include tree.h
645 tree (*resolve_overloaded_builtin) (unsigned int /*location_t*/,
646 tree decl, void *params);
648 /* Fold a target-specific builtin. */
649 tree (* fold_builtin) (tree fndecl, int nargs, tree *argp, bool ignore);
651 /* Returns a code for a target-specific builtin that implements
652 reciprocal of the function, or NULL_TREE if not available. */
653 tree (* builtin_reciprocal) (unsigned, bool, bool);
655 /* For a vendor-specific TYPE, return a pointer to a statically-allocated
656 string containing the C++ mangling for TYPE. In all other cases, return
658 const char * (* mangle_type) (const_tree type);
660 /* Make any adjustments to libfunc names needed for this target. */
661 void (* init_libfuncs) (void);
663 /* Given a decl, a section name, and whether the decl initializer
664 has relocs, choose attributes for the section. */
665 /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */
666 unsigned int (* section_type_flags) (tree, const char *, int);
668 /* True if new jumps cannot be created, to replace existing ones or
669 not, at the current point in the compilation. */
670 bool (* cannot_modify_jumps_p) (void);
672 /* Return a register class for which branch target register
673 optimizations should be applied. */
674 enum reg_class (* branch_target_register_class) (void);
676 /* Return true if branch target register optimizations should include
677 callee-saved registers that are not already live during the current
678 function. AFTER_PE_GEN is true if prologues and epilogues have
679 already been generated. */
680 bool (* branch_target_register_callee_saved) (bool after_pe_gen);
682 /* Return true if the target supports conditional execution. */
683 bool (* have_conditional_execution) (void);
685 /* Return a new value for loop unroll size. */
686 unsigned (* loop_unroll_adjust) (unsigned nunroll, struct loop *loop);
688 /* True if the constant X cannot be placed in the constant pool. */
689 bool (* cannot_force_const_mem) (rtx);
691 /* True if the insn X cannot be duplicated. */
692 bool (* cannot_copy_insn_p) (rtx);
694 /* True if X is considered to be commutative. */
695 bool (* commutative_p) (const_rtx, int);
697 /* True if ADDR is an address-expression whose effect depends
698 on the mode of the memory reference it is used in. */
699 bool (* mode_dependent_address_p) (const_rtx addr);
701 /* Given an invalid address X for a given machine mode, try machine-specific
702 ways to make it legitimate. Return X or an invalid address on failure. */
703 rtx (* legitimize_address) (rtx, rtx, enum machine_mode);
705 /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */
706 rtx (* delegitimize_address) (rtx);
708 /* Given an address RTX, say whether it is valid. */
709 bool (* legitimate_address_p) (enum machine_mode, rtx, bool);
711 /* True if the given constant can be put into an object_block. */
712 bool (* use_blocks_for_constant_p) (enum machine_mode, const_rtx);
714 /* The minimum and maximum byte offsets for anchored addresses. */
715 HOST_WIDE_INT min_anchor_offset;
716 HOST_WIDE_INT max_anchor_offset;
718 /* True if section anchors can be used to access the given symbol. */
719 bool (* use_anchors_for_symbol_p) (const_rtx);
721 /* True if it is OK to do sibling call optimization for the specified
722 call expression EXP. DECL will be the called function, or NULL if
723 this is an indirect call. */
724 bool (*function_ok_for_sibcall) (tree decl, tree exp);
726 /* Establish appropriate back-end context for processing the function
727 FNDECL. The argument might be NULL to indicate processing at top
728 level, outside of any function scope. */
729 void (*set_current_function) (tree fndecl);
731 /* True if EXP should be placed in a "small data" section. */
732 bool (* in_small_data_p) (const_tree);
734 /* True if EXP names an object for which name resolution must resolve
735 to the current executable or shared library. */
736 bool (* binds_local_p) (const_tree);
738 /* Modify and return the identifier of a DECL's external name,
739 originally identified by ID, as required by the target,
740 (eg, append @nn to windows32 stdcall function names).
741 The default is to return ID without modification. */
742 tree (* mangle_decl_assembler_name) (tree decl, tree id);
744 /* Do something target-specific to record properties of the DECL into
745 the associated SYMBOL_REF. */
746 void (* encode_section_info) (tree, rtx, int);
748 /* Undo the effects of encode_section_info on the symbol string. */
749 const char * (* strip_name_encoding) (const char *);
751 /* If shift optabs for MODE are known to always truncate the shift count,
752 return the mask that they apply. Return 0 otherwise. */
753 unsigned HOST_WIDE_INT (* shift_truncation_mask) (enum machine_mode mode);
755 /* Return the number of divisions in the given MODE that should be present,
756 so that it is profitable to turn the division into a multiplication by
758 unsigned int (* min_divisions_for_recip_mul) (enum machine_mode mode);
760 /* If the representation of integral MODE is such that values are
761 always sign-extended to a wider mode MODE_REP then return
762 SIGN_EXTEND. Return UNKNOWN otherwise. */
763 /* Note that the return type ought to be RTX_CODE, but that's not
764 necessarily defined at this point. */
765 int (* mode_rep_extended) (enum machine_mode mode,
766 enum machine_mode mode_rep);
768 /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */
769 bool (* valid_pointer_mode) (enum machine_mode mode);
771 /* Support for named address spaces. */
773 /* MODE to use for a pointer into another address space. */
774 enum machine_mode (* pointer_mode) (addr_space_t);
776 /* MODE to use for an address in another address space. */
777 enum machine_mode (* address_mode) (addr_space_t);
779 /* True if MODE is valid for a pointer in __attribute__((mode("MODE")))
780 in another address space. */
781 bool (* valid_pointer_mode) (enum machine_mode, addr_space_t);
783 /* True if an address is a valid memory address to a given named address
784 space for a given mode. */
785 bool (* legitimate_address_p) (enum machine_mode, rtx, bool, addr_space_t);
787 /* Return an updated address to convert an invalid pointer to a named
788 address space to a valid one. If NULL_RTX is returned use machine
789 independent methods to make the address valid. */
790 rtx (* legitimize_address) (rtx, rtx, enum machine_mode, addr_space_t);
792 /* True if one named address space is a subset of another named address. */
793 bool (* subset_p) (addr_space_t, addr_space_t);
795 /* Function to convert an rtl expression from one address space to
797 rtx (* convert) (rtx, tree, tree);
801 /* True if MODE is valid for the target. By "valid", we mean able to
802 be manipulated in non-trivial ways. In particular, this means all
803 the arithmetic is supported. */
804 bool (* scalar_mode_supported_p) (enum machine_mode mode);
806 /* Similarly for vector modes. "Supported" here is less strict. At
807 least some operations are supported; need to check optabs or builtins
808 for further details. */
809 bool (* vector_mode_supported_p) (enum machine_mode mode);
811 /* Compute cost of moving registers to/from memory. */
812 int (* memory_move_cost) (enum machine_mode, enum reg_class, bool);
814 /* True for MODE if the target expects that registers in this mode will
815 be allocated to registers in a small register class. The compiler is
816 allowed to use registers explicitly used in the rtl as spill registers
817 but it should prevent extending the lifetime of these registers. */
818 bool (* small_register_classes_for_mode_p) (enum machine_mode mode);
820 /* Compute a (partial) cost for rtx X. Return true if the complete
821 cost has been computed, and false if subexpressions should be
822 scanned. In either case, *TOTAL contains the cost result. */
823 /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's
824 not necessarily defined at this point. */
825 bool (* rtx_costs) (rtx x, int code, int outer_code, int *total, bool speed);
827 /* Compute the cost of X, used as an address. Never called with
828 invalid addresses. */
829 int (* address_cost) (rtx x, bool speed);
831 /* Return where to allocate pseudo for a given hard register initial
833 rtx (* allocate_initial_value) (rtx x);
835 /* Return nonzero if evaluating UNSPEC[_VOLATILE] X might cause a trap.
836 FLAGS has the same meaning as in rtlanal.c: may_trap_p_1. */
837 int (* unspec_may_trap_p) (const_rtx x, unsigned flags);
839 /* Given a register, this hook should return a parallel of registers
840 to represent where to find the register pieces. Define this hook
841 if the register and its mode are represented in Dwarf in
842 non-contiguous locations, or if the register should be
843 represented in more than one register in Dwarf. Otherwise, this
844 hook should return NULL_RTX. */
845 rtx (* dwarf_register_span) (rtx);
847 /* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
848 entries not corresponding directly to registers below
849 FIRST_PSEUDO_REGISTER, this hook should generate the necessary
850 code, given the address of the table. */
851 void (* init_dwarf_reg_sizes_extra) (tree);
853 /* Fetch the fixed register(s) which hold condition codes, for
854 targets where it makes sense to look for duplicate assignments to
855 the condition codes. This should return true if there is such a
856 register, false otherwise. The arguments should be set to the
857 fixed register numbers. Up to two condition code registers are
858 supported. If there is only one for this target, the int pointed
859 at by the second argument should be set to -1. */
860 bool (* fixed_condition_code_regs) (unsigned int *, unsigned int *);
862 /* If two condition code modes are compatible, return a condition
863 code mode which is compatible with both, such that a comparison
864 done in the returned mode will work for both of the original
865 modes. If the condition code modes are not compatible, return
867 enum machine_mode (* cc_modes_compatible) (enum machine_mode,
870 /* Do machine-dependent code transformations. Called just before
871 delayed-branch scheduling. */
872 void (* machine_dependent_reorg) (void);
874 /* Create the __builtin_va_list type. */
875 tree (* build_builtin_va_list) (void);
877 /* Enumerate the va list variants. */
878 int (* enum_va_list) (int, const char **, tree *);
880 /* Get the cfun/fndecl calling abi __builtin_va_list type. */
881 tree (* fn_abi_va_list) (tree);
883 /* Get the __builtin_va_list type dependent on input type. */
884 tree (* canonical_va_list_type) (tree);
886 /* Expand the __builtin_va_start builtin. */
887 void (* expand_builtin_va_start) (tree valist, rtx nextarg);
889 /* Gimplifies a VA_ARG_EXPR. */
890 tree (* gimplify_va_arg_expr) (tree valist, tree type, gimple_seq *pre_p,
893 /* Validity-checking routines for PCH files, target-specific.
894 get_pch_validity returns a pointer to the data to be stored,
895 and stores the size in its argument. pch_valid_p gets the same
896 information back and returns NULL if the PCH is valid,
897 or an error message if not.
899 void * (* get_pch_validity) (size_t *);
900 const char * (* pch_valid_p) (const void *, size_t);
902 /* If nonnull, this function checks whether a PCH file with the
903 given set of target flags can be used. It returns NULL if so,
904 otherwise it returns an error message. */
905 const char *(*check_pch_target_flags) (int);
907 /* True if the compiler should give an enum type only as many
908 bytes as it takes to represent the range of possible values of
910 bool (* default_short_enums) (void);
912 /* This target hook returns an rtx that is used to store the address
913 of the current frame into the built-in setjmp buffer. */
914 rtx (* builtin_setjmp_frame_value) (void);
916 /* This target hook should add STRING_CST trees for any hard regs
917 the port wishes to automatically clobber for an asm. */
918 tree (* md_asm_clobbers) (tree, tree, tree);
920 /* This target hook allows the backend to specify a calling convention
921 in the debug information. This function actually returns an
922 enum dwarf_calling_convention, but because of forward declarations
923 and not wanting to include dwarf2.h everywhere target.h is included
924 the function is being declared as an int. */
925 int (* dwarf_calling_convention) (const_tree);
927 /* This target hook allows the backend to emit frame-related insns that
928 contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info
929 engine will invoke it on insns of the form
930 (set (reg) (unspec [...] UNSPEC_INDEX))
932 (set (reg) (unspec_volatile [...] UNSPECV_INDEX))
933 to let the backend emit the call frame instructions. */
934 void (* dwarf_handle_frame_unspec) (const char *, rtx, int);
936 /* Perform architecture specific checking of statements gimplified
937 from VA_ARG_EXPR. STMT is the statement. Returns true if the statement
938 doesn't need to be checked for va_list references. */
939 bool (* stdarg_optimize_hook) (struct stdarg_info *ai, const_gimple stmt);
941 /* This target hook allows the operating system to override the DECL
942 that represents the external variable that contains the stack
943 protection guard variable. The type of this DECL is ptr_type_node. */
944 tree (* stack_protect_guard) (void);
946 /* This target hook allows the operating system to override the CALL_EXPR
947 that is invoked when a check vs the guard variable fails. */
948 tree (* stack_protect_fail) (void);
950 /* Returns NULL if target supports the insn within a doloop block,
951 otherwise it returns an error message. */
952 const char * (*invalid_within_doloop) (const_rtx);
954 /* DECL is a variable or function with __attribute__((dllimport))
955 specified. Use this hook if the target needs to add extra validation
956 checks to handle_dll_attribute (). */
957 bool (* valid_dllimport_attribute_p) (const_tree decl);
959 /* If non-zero, align constant anchors in CSE to a multiple of this
961 unsigned HOST_WIDE_INT const_anchor;
963 /* Functions relating to calls - argument passing, returns, etc. */
965 enum machine_mode (*promote_function_mode) (const_tree type,
966 enum machine_mode mode,
970 bool (*promote_prototypes) (const_tree fntype);
971 rtx (*struct_value_rtx) (tree fndecl, int incoming);
972 bool (*return_in_memory) (const_tree type, const_tree fndecl);
973 bool (*return_in_msb) (const_tree type);
975 /* Return true if a parameter must be passed by reference. TYPE may
976 be null if this is a libcall. CA may be null if this query is
977 from __builtin_va_arg. */
978 bool (*pass_by_reference) (CUMULATIVE_ARGS *ca, enum machine_mode mode,
979 const_tree type, bool named_arg);
981 rtx (*expand_builtin_saveregs) (void);
982 /* Returns pretend_argument_size. */
983 void (*setup_incoming_varargs) (CUMULATIVE_ARGS *ca, enum machine_mode mode,
984 tree type, int *pretend_arg_size,
986 bool (*strict_argument_naming) (CUMULATIVE_ARGS *ca);
987 /* Returns true if we should use
988 targetm.calls.setup_incoming_varargs() and/or
989 targetm.calls.strict_argument_naming(). */
990 bool (*pretend_outgoing_varargs_named) (CUMULATIVE_ARGS *ca);
992 /* Given a complex type T, return true if a parameter of type T
993 should be passed as two scalars. */
994 bool (* split_complex_arg) (const_tree type);
996 /* Return true if type T, mode MODE, may not be passed in registers,
997 but must be passed on the stack. */
998 /* ??? This predicate should be applied strictly after pass-by-reference.
999 Need audit to verify that this is the case. */
1000 bool (* must_pass_in_stack) (enum machine_mode mode, const_tree t);
1002 /* Return true if type TYPE, mode MODE, which is passed by reference,
1003 should have the object copy generated by the callee rather than
1004 the caller. It is never called for TYPE requiring constructors. */
1005 bool (* callee_copies) (CUMULATIVE_ARGS *ca, enum machine_mode mode,
1006 const_tree type, bool named);
1008 /* Return zero for arguments passed entirely on the stack or entirely
1009 in registers. If passed in both, return the number of bytes passed
1010 in registers; the balance is therefore passed on the stack. */
1011 int (* arg_partial_bytes) (CUMULATIVE_ARGS *ca, enum machine_mode mode,
1012 tree type, bool named);
1014 /* Return the diagnostic message string if function without a prototype
1015 is not allowed for this 'val' argument; NULL otherwise. */
1016 const char *(*invalid_arg_for_unprototyped_fn) (const_tree typelist,
1017 const_tree funcdecl,
1020 /* Return an rtx for the return value location of the function
1021 specified by FN_DECL_OR_TYPE with a return type of RET_TYPE. */
1022 rtx (*function_value) (const_tree ret_type, const_tree fn_decl_or_type,
1025 /* Return the rtx for the result of a libcall of mode MODE,
1026 calling the function FN_NAME. */
1027 rtx (*libcall_value) (enum machine_mode, const_rtx);
1029 /* Return true if REGNO is a possible register number for
1030 a function value as seen by the caller. */
1031 bool (*function_value_regno_p) (const unsigned int);
1033 /* Return an rtx for the argument pointer incoming to the
1034 current function. */
1035 rtx (*internal_arg_pointer) (void);
1037 /* Update the current function stack boundary if needed. */
1038 void (*update_stack_boundary) (void);
1040 /* Handle stack alignment and return an rtx for Dynamic Realign
1041 Argument Pointer if necessary. */
1042 rtx (*get_drap_rtx) (void);
1044 /* Return true if all function parameters should be spilled to the
1046 bool (*allocate_stack_slots_for_args) (void);
1048 /* Return an rtx for the static chain for FNDECL. If INCOMING_P is true,
1049 then it should be for the callee; otherwise for the caller. */
1050 rtx (*static_chain) (const_tree fndecl, bool incoming_p);
1052 /* Fill in the trampoline at MEM with a call to FNDECL and a
1053 static chain value of CHAIN. */
1054 void (*trampoline_init) (rtx mem, tree fndecl, rtx chain);
1056 /* Adjust the address of the trampoline in a target-specific way. */
1057 rtx (*trampoline_adjust_address) (rtx addr);
1060 /* Return the diagnostic message string if conversion from FROMTYPE
1061 to TOTYPE is not allowed, NULL otherwise. */
1062 const char *(*invalid_conversion) (const_tree fromtype, const_tree totype);
1064 /* Return the diagnostic message string if the unary operation OP is
1065 not permitted on TYPE, NULL otherwise. */
1066 const char *(*invalid_unary_op) (int op, const_tree type);
1068 /* Return the diagnostic message string if the binary operation OP
1069 is not permitted on TYPE1 and TYPE2, NULL otherwise. */
1070 const char *(*invalid_binary_op) (int op, const_tree type1, const_tree type2);
1072 /* Return the diagnostic message string if TYPE is not valid as a
1073 function parameter type, NULL otherwise. */
1074 const char *(*invalid_parameter_type) (const_tree type);
1076 /* Return the diagnostic message string if TYPE is not valid as a
1077 function return type, NULL otherwise. */
1078 const char *(*invalid_return_type) (const_tree type);
1080 /* If values of TYPE are promoted to some other type when used in
1081 expressions (analogous to the integer promotions), return that type,
1082 or NULL_TREE otherwise. */
1083 tree (*promoted_type) (const_tree type);
1085 /* Convert EXPR to TYPE, if target-specific types with special conversion
1086 rules are involved. Return the converted expression, or NULL to apply
1087 the standard conversion rules. */
1088 tree (*convert_to_type) (tree type, tree expr);
1090 /* Return the array of IRA cover classes for the current target. */
1091 const enum reg_class *(*ira_cover_classes) (void);
1093 /* Return the class for a secondary reload, and fill in extra information. */
1094 enum reg_class (*secondary_reload) (bool, rtx, enum reg_class,
1096 secondary_reload_info *);
1098 /* This target hook allows the backend to perform additional
1099 processing while initializing for variable expansion. */
1100 void (* expand_to_rtl_hook) (void);
1102 /* This target hook allows the backend to perform additional
1103 instantiations on rtx that are not actually in insns yet,
1104 but will be later. */
1105 void (* instantiate_decls) (void);
1107 /* Return true if is OK to use a hard register REGNO as scratch register
1109 bool (* hard_regno_scratch_ok) (unsigned int regno);
1111 /* Return the smallest number of different values for which it is best to
1112 use a jump-table instead of a tree of conditional branches. */
1113 unsigned int (* case_values_threshold) (void);
1115 /* Retutn true if a function must have and use a frame pointer. */
1116 bool (* frame_pointer_required) (void);
1118 /* Returns true if the compiler is allowed to try to replace register number
1119 from-reg with register number to-reg. */
1120 bool (* can_eliminate) (const int, const int);
1122 /* Functions specific to the C family of frontends. */
1124 /* Return machine mode for non-standard suffix
1125 or VOIDmode if non-standard suffixes are unsupported. */
1126 enum machine_mode (*mode_for_suffix) (char);
1129 /* Functions specific to the C++ frontend. */
1131 /* Return the integer type used for guard variables. */
1132 tree (*guard_type) (void);
1133 /* Return true if only the low bit of the guard should be tested. */
1134 bool (*guard_mask_bit) (void);
1135 /* Returns the size of the array cookie for an array of type. */
1136 tree (*get_cookie_size) (tree);
1137 /* Returns true if the element size should be stored in the
1139 bool (*cookie_has_size) (void);
1140 /* Allows backends to perform additional processing when
1141 deciding if a class should be exported or imported. */
1142 int (*import_export_class) (tree, int);
1143 /* Returns true if constructors and destructors return "this". */
1144 bool (*cdtor_returns_this) (void);
1145 /* Returns true if the key method for a class can be an inline
1146 function, so long as it is not declared inline in the class
1147 itself. Returning true is the behavior required by the Itanium
1149 bool (*key_method_may_be_inline) (void);
1150 /* DECL is a virtual table, virtual table table, typeinfo object,
1151 or other similar implicit class data object that will be
1152 emitted with external linkage in this translation unit. No ELF
1153 visibility has been explicitly specified. If the target needs
1154 to specify a visibility other than that of the containing class,
1155 use this hook to set DECL_VISIBILITY and
1156 DECL_VISIBILITY_SPECIFIED. */
1157 void (*determine_class_data_visibility) (tree decl);
1158 /* Returns true (the default) if virtual tables and other
1159 similar implicit class data objects are always COMDAT if they
1160 have external linkage. If this hook returns false, then
1161 class data for classes whose virtual table will be emitted in
1162 only one translation unit will not be COMDAT. */
1163 bool (*class_data_always_comdat) (void);
1164 /* Returns true (the default) if the RTTI for the basic types,
1165 which is always defined in the C++ runtime, should be COMDAT;
1166 false if it should not be COMDAT. */
1167 bool (*library_rtti_comdat) (void);
1168 /* Returns true if __aeabi_atexit should be used to register static
1170 bool (*use_aeabi_atexit) (void);
1171 /* Returns true if target may use atexit in the same manner as
1172 __cxa_atexit to register static destructors. */
1173 bool (*use_atexit_for_cxa_atexit) (void);
1174 /* TYPE is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that
1175 has just been defined. Use this hook to make adjustments to the
1176 class (eg, tweak visibility or perform any other required
1177 target modifications). */
1178 void (*adjust_class_at_definition) (tree type);
1181 /* Functions and data for emulated TLS support. */
1183 /* Name of the address and common functions. */
1184 const char *get_address;
1185 const char *register_common;
1187 /* Prefixes for proxy variable and template. */
1188 const char *var_section;
1189 const char *tmpl_section;
1191 /* Prefixes for proxy variable and template. */
1192 const char *var_prefix;
1193 const char *tmpl_prefix;
1195 /* Function to generate field definitions of the proxy variable. */
1196 tree (*var_fields) (tree, tree *);
1198 /* Function to initialize a proxy variable. */
1199 tree (*var_init) (tree, tree, tree);
1201 /* Whether we are allowed to alter the usual alignment of the
1203 bool var_align_fixed;
1205 /* Whether we can emit debug information for TLS vars. */
1206 bool debug_form_tls_address;
1209 struct target_option_hooks {
1210 /* Function to validate the attribute((option(...))) strings or NULL. If
1211 the option is validated, it is assumed that DECL_FUNCTION_SPECIFIC will
1212 be filled in in the function decl node. */
1213 bool (*valid_attribute_p) (tree, tree, tree, int);
1215 /* Function to save any extra target state in the target options
1217 void (*save) (struct cl_target_option *);
1219 /* Function to restore any extra target state from the target options
1221 void (*restore) (struct cl_target_option *);
1223 /* Function to print any extra target state from the target options
1225 void (*print) (FILE *, int, struct cl_target_option *);
1227 /* Function to parse arguments to be validated for #pragma option, and to
1228 change the state if the options are valid. If the first argument is
1229 NULL, the second argument specifies the default options to use. Return
1230 true if the options are valid, and set the current state. */
1231 bool (*pragma_parse) (tree, tree);
1233 /* Function to determine if one function can inline another function. */
1234 bool (*can_inline_p) (tree, tree);
1237 /* For targets that need to mark extra registers as live on entry to
1238 the function, they should define this target hook and set their
1239 bits in the bitmap passed in. */
1240 void (*live_on_entry) (bitmap);
1242 /* True if unwinding tables should be generated by default. */
1243 bool unwind_tables_default;
1245 /* Leave the boolean fields at the end. */
1247 /* True if arbitrary sections are supported. */
1248 bool have_named_sections;
1250 /* True if we can create zeroed data by switching to a BSS section
1251 and then using ASM_OUTPUT_SKIP to allocate the space. */
1252 bool have_switchable_bss_sections;
1254 /* True if "native" constructors and destructors are supported,
1255 false if we're using collect2 for the job. */
1256 bool have_ctors_dtors;
1258 /* True if thread-local storage is supported. */
1261 /* True if a small readonly data section is supported. */
1262 bool have_srodata_section;
1264 /* True if EH frame info sections should be zero-terminated. */
1265 bool terminate_dw2_eh_frame_info;
1267 /* True if #NO_APP should be emitted at the beginning of
1269 bool file_start_app_off;
1271 /* True if output_file_directive should be called for main_input_filename
1272 at the beginning of assembly output. */
1273 bool file_start_file_directive;
1275 /* True if #pragma extern_prefix is to be supported. */
1276 bool handle_pragma_extern_prefix;
1278 /* True if the target is allowed to reorder memory accesses unless
1279 synchronization is explicitly requested. */
1280 bool relaxed_ordering;
1282 /* Returns true if we should generate exception tables for use with the
1283 ARM EABI. The effects the encoding of function exception specifications.
1285 bool arm_eabi_unwinder;
1287 /* Leave the boolean fields at the end. */
1290 extern struct gcc_target targetm;
1292 struct gcc_targetcm {
1293 /* Handle target switch CODE (an OPT_* value). ARG is the argument
1294 passed to the switch; it is NULL if no argument was. VALUE is the
1295 value of ARG if CODE specifies a UInteger option, otherwise it is
1296 1 if the positive form of the switch was used and 0 if the negative
1297 form was. Return true if the switch was valid. */
1298 bool (*handle_c_option) (size_t code, const char *arg, int value);
1301 /* Each target can provide their own. */
1302 extern struct gcc_targetcm targetcm;
1304 #endif /* GCC_TARGET_H */
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