gcc/target.def

   1 /* Target hook definitions.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
   3    2011
   4    Free Software Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 3, or (at your option) any
   9    later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; see the file COPYING3.  If not see
  18    <http://www.gnu.org/licenses/>.
  19
  20    In other words, you are welcome to use, share and improve this program.
  21    You are forbidden to forbid anyone else to use, share and improve
  22    what you give them.   Help stamp out software-hoarding!  */
  23
  24 /* See target-hooks-macros.h for details of macros that should be
  25    provided by the including file, and how to use them here.  */
  26 #include "target-hooks-macros.h"
  27
  28 #undef HOOK_TYPE
  29 #define HOOK_TYPE "Target Hook"
  30
  31 HOOK_VECTOR (TARGET_INITIALIZER, gcc_target)
  32
  33 /* Functions that output assembler for the target.  */
  34 #define HOOK_PREFIX "TARGET_ASM_"
  35 HOOK_VECTOR (TARGET_ASM_OUT, asm_out)
  36
  37 /* Opening and closing parentheses for asm expression grouping.  */
  38 DEFHOOKPOD
  39 (open_paren,
  40  "",
  41  const char *, "(")
  42 DEFHOOKPODX (close_paren, const char *, ")")
  43
  44 /* Assembler instructions for creating various kinds of integer object.  */
  45 DEFHOOKPOD
  46 (byte_op,
  47  "",
  48  const char *, "\t.byte\t")
  49 DEFHOOKPOD (aligned_op, "*", struct asm_int_op, TARGET_ASM_ALIGNED_INT_OP)
  50 DEFHOOKPOD (unaligned_op, "*", struct asm_int_op, TARGET_ASM_UNALIGNED_INT_OP)
  51
  52 /* The maximum number of bytes to skip when applying
  53    LABEL_ALIGN_AFTER_BARRIER.  */
  54 DEFHOOK
  55 (label_align_after_barrier_max_skip,
  56  "",
  57  int, (rtx label),
  58  default_label_align_after_barrier_max_skip)
  59
  60 /* The maximum number of bytes to skip when applying
  61    LOOP_ALIGN.  */
  62 DEFHOOK
  63 (loop_align_max_skip,
  64  "",
  65  int, (rtx label),
  66  default_loop_align_max_skip)
  67
  68 /* The maximum number of bytes to skip when applying
  69    LABEL_ALIGN.  */
  70 DEFHOOK
  71 (label_align_max_skip,
  72  "",
  73  int, (rtx label),
  74  default_label_align_max_skip)
  75
  76 /* The maximum number of bytes to skip when applying
  77    JUMP_ALIGN.  */
  78 DEFHOOK
  79 (jump_align_max_skip,
  80  "",
  81  int, (rtx label),
  82  default_jump_align_max_skip)
  83
  84 /* Try to output the assembler code for an integer object whose
  85    value is given by X.  SIZE is the size of the object in bytes and
  86    ALIGNED_P indicates whether it is aligned.  Return true if
  87    successful.  Only handles cases for which BYTE_OP, ALIGNED_OP
  88    and UNALIGNED_OP are NULL.  */
  89 DEFHOOK
  90 (integer,
  91  "",
  92  /* Only handles cases for which BYTE_OP, ALIGNED_OP and UNALIGNED_OP are
  93     NULL.  */
  94  bool, (rtx x, unsigned int size, int aligned_p),
  95  default_assemble_integer)
  96
  97 /* Output code that will globalize a label.  */
  98 DEFHOOK
  99 (globalize_label,
 100  "",
 101  void, (FILE *stream, const char *name),
 102  default_globalize_label)
 103
 104 /* Output code that will globalize a declaration.  */
 105 DEFHOOK
 106 (globalize_decl_name,
 107  "",
 108  void, (FILE *stream, tree decl), default_globalize_decl_name)
 109
 110 /* Output code that will emit a label for unwind info, if this
 111    target requires such labels.  Second argument is the decl the
 112    unwind info is associated with, third is a boolean: true if
 113    this is for exception handling, fourth is a boolean: true if
 114    this is only a placeholder for an omitted FDE.  */
 115 DEFHOOK
 116 (emit_unwind_label,
 117  "",
 118  void, (FILE *stream, tree decl, int for_eh, int empty),
 119  default_emit_unwind_label)
 120
 121 /* Output code that will emit a label to divide up the exception table.  */
 122 DEFHOOK
 123 (emit_except_table_label,
 124  "",
 125  void, (FILE *stream),
 126  default_emit_except_table_label)
 127
 128 /* Emit a directive for setting the personality for the function.  */
 129 DEFHOOK
 130 (emit_except_personality,
 131  "If the target implements @code{TARGET_ASM_UNWIND_EMIT}, this hook may be\
 132  used to emit a directive to install a personality hook into the unwind\
 133  info.  This hook should not be used if dwarf2 unwind info is used.",
 134  void, (rtx personality),
 135  NULL)
 136
 137 /* Emit any directives required to unwind this instruction.  */
 138 DEFHOOK
 139 (unwind_emit,
 140  "",
 141  void, (FILE *stream, rtx insn),
 142  NULL)
 143
 144 DEFHOOKPOD
 145 (unwind_emit_before_insn,
 146  "True if the @code{TARGET_ASM_UNWIND_EMIT} hook should be called before\
 147  the assembly for @var{insn} has been emitted, false if the hook should\
 148  be called afterward.",
 149  bool, true)
 150
 151 /* Generate an internal label.
 152    For now this is just a wrapper for ASM_GENERATE_INTERNAL_LABEL.  */
 153 DEFHOOK_UNDOC
 154 (generate_internal_label,
 155  "",
 156  void, (char *buf, const char *prefix, unsigned long labelno),
 157  default_generate_internal_label)
 158
 159 /* Output an internal label.  */
 160 DEFHOOK
 161 (internal_label,
 162  "",
 163  void, (FILE *stream, const char *prefix, unsigned long labelno),
 164  default_internal_label)
 165
 166 /* Output label for the constant.  */
 167 DEFHOOK
 168 (declare_constant_name,
 169  "",
 170  void, (FILE *file, const char *name, const_tree expr, HOST_WIDE_INT size),
 171  default_asm_declare_constant_name)
 172
 173 /* Emit a ttype table reference to a typeinfo object.  */
 174 DEFHOOK
 175 (ttype,
 176  "",
 177  bool, (rtx sym),
 178  hook_bool_rtx_false)
 179
 180 /* Emit an assembler directive to set visibility for the symbol
 181    associated with the tree decl.  */
 182 DEFHOOK
 183 (assemble_visibility,
 184  "",
 185  void, (tree decl, int visibility),
 186  default_assemble_visibility)
 187
 188 /* Output the assembler code for entry to a function.  */
 189 DEFHOOK
 190 (function_prologue,
 191  "",
 192  void, (FILE *file, HOST_WIDE_INT size),
 193  default_function_pro_epilogue)
 194
 195 /* Output the assembler code for end of prologue.  */
 196 DEFHOOK
 197 (function_end_prologue,
 198  "",
 199  void, (FILE *file),
 200  no_asm_to_stream)
 201
 202 /* Output the assembler code for start of epilogue.  */
 203 DEFHOOK
 204 (function_begin_epilogue,
 205  "",
 206  void, (FILE *file),
 207  no_asm_to_stream)
 208
 209 /* Output the assembler code for function exit.  */
 210 DEFHOOK
 211 (function_epilogue,
 212  "",
 213  void, (FILE *file, HOST_WIDE_INT size),
 214  default_function_pro_epilogue)
 215
 216 /* Initialize target-specific sections.  */
 217 DEFHOOK
 218 (init_sections,
 219  "",
 220  void, (void),
 221  hook_void_void)
 222
 223 /* Tell assembler to change to section NAME with attributes FLAGS.
 224    If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with
 225    which this section is associated.  */
 226 DEFHOOK
 227 (named_section,
 228  "",
 229  void, (const char *name, unsigned int flags, tree decl),
 230  default_no_named_section)
 231
 232 /* Return preferred text (sub)section for function DECL.
 233    Main purpose of this function is to separate cold, normal and hot
 234    functions. STARTUP is true when function is known to be used only
 235    at startup (from static constructors or it is main()).
 236    EXIT is true when function is known to be used only at exit
 237    (from static destructors).
 238    Return NULL if function should go to default text section.  */
 239 DEFHOOK
 240 (function_section,
 241  "",
 242  section *, (tree decl, enum node_frequency freq, bool startup, bool exit),
 243  default_function_section)
 244
 245 /* Output the assembler code for function exit.  */
 246 DEFHOOK
 247 (function_switched_text_sections,
 248  "Used by the target to emit any assembler directives or additional\
 249   labels needed when a function is partitioned between different\
 250   sections.  Output should be written to @var{file}.  The function\
 251   decl is available as @var{decl} and the new section is `cold' if\
 252   @var{new_is_cold} is @code{true}.",
 253  void, (FILE *file, tree decl, bool new_is_cold),
 254  default_function_switched_text_sections)
 255
 256 /* Return a mask describing how relocations should be treated when
 257    selecting sections.  Bit 1 should be set if global relocations
 258    should be placed in a read-write section; bit 0 should be set if
 259    local relocations should be placed in a read-write section.  */
 260 DEFHOOK
 261 (reloc_rw_mask,
 262  "",
 263  int, (void),
 264  default_reloc_rw_mask)
 265
 266  /* Return a section for EXP.  It may be a DECL or a constant.  RELOC
 267     is nonzero if runtime relocations must be applied; bit 1 will be
 268     set if the runtime relocations require non-local name resolution.
 269     ALIGN is the required alignment of the data.  */
 270 DEFHOOK
 271 (select_section,
 272  "",
 273  section *, (tree exp, int reloc, unsigned HOST_WIDE_INT align),
 274  default_select_section)
 275
 276 /* Return a section for X.  MODE is X's mode and ALIGN is its
 277    alignment in bits.  */
 278 DEFHOOK
 279 (select_rtx_section,
 280  "",
 281  section *, (enum machine_mode mode, rtx x, unsigned HOST_WIDE_INT align),
 282  default_select_rtx_section)
 283
 284 /* Select a unique section name for DECL.  RELOC is the same as
 285    for SELECT_SECTION.  */
 286 DEFHOOK
 287 (unique_section,
 288  "",
 289  void, (tree decl, int reloc),
 290  default_unique_section)
 291
 292 /* Return the readonly data section associated with function DECL.  */
 293 DEFHOOK
 294 (function_rodata_section,
 295  "",
 296  section *, (tree decl),
 297  default_function_rodata_section)
 298
 299 /* Nonnull if the target wants to override the default ".rodata" prefix
 300    for mergeable data sections.  */
 301 DEFHOOKPOD
 302 (mergeable_rodata_prefix,
 303  "Usually, the compiler uses the prefix @code{\".rodata\"} to construct\n\
 304 section names for mergeable constant data.  Define this macro to override\n\
 305 the string if a different section name should be used.",
 306  const char *, ".rodata")
 307
 308 /* Return the section to be used for transactional memory clone tables.  */
 309 DEFHOOK
 310 (tm_clone_table_section,
 311  "Return the section that should be used for transactional memory clone\
 312   tables.",
 313  section *, (void), default_clone_table_section)
 314
 315 /* Output a constructor for a symbol with a given priority.  */
 316 DEFHOOK
 317 (constructor,
 318  "",
 319  void, (rtx symbol, int priority), NULL)
 320
 321 /* Output a destructor for a symbol with a given priority.  */
 322 DEFHOOK
 323 (destructor,
 324  "",
 325  void, (rtx symbol, int priority), NULL)
 326
 327 /* Output the assembler code for a thunk function.  THUNK_DECL is the
 328    declaration for the thunk function itself, FUNCTION is the decl for
 329    the target function.  DELTA is an immediate constant offset to be
 330    added to THIS.  If VCALL_OFFSET is nonzero, the word at
 331    *(*this + vcall_offset) should be added to THIS.  */
 332 DEFHOOK
 333 (output_mi_thunk,
 334  "",
 335  void, (FILE *file, tree thunk_fndecl, HOST_WIDE_INT delta,
 336         HOST_WIDE_INT vcall_offset, tree function),
 337  NULL)
 338
 339 /* Determine whether output_mi_thunk would succeed.  */
 340 /* ??? Ideally, this hook would not exist, and success or failure
 341    would be returned from output_mi_thunk directly.  But there's
 342    too much undo-able setup involved in invoking output_mi_thunk.
 343    Could be fixed by making output_mi_thunk emit rtl instead of
 344    text to the output file.  */
 345 DEFHOOK
 346 (can_output_mi_thunk,
 347  "",
 348  bool, (const_tree thunk_fndecl, HOST_WIDE_INT delta,
 349         HOST_WIDE_INT vcall_offset, const_tree function),
 350  hook_bool_const_tree_hwi_hwi_const_tree_false)
 351
 352 /* Output any boilerplate text needed at the beginning of a
 353    translation unit.  */
 354 DEFHOOK
 355 (file_start,
 356  "",
 357  void, (void),
 358  default_file_start)
 359
 360 /* Output any boilerplate text needed at the end of a translation unit.  */
 361 DEFHOOK
 362 (file_end,
 363  "",
 364  void, (void),
 365  hook_void_void)
 366
 367 /* Output any boilerplate text needed at the beginning of an
 368    LTO output stream.  */
 369 DEFHOOK
 370 (lto_start,
 371  "",
 372  void, (void),
 373  hook_void_void)
 374
 375 /* Output any boilerplate text needed at the end of an
 376    LTO output stream.  */
 377 DEFHOOK
 378 (lto_end,
 379  "",
 380  void, (void),
 381  hook_void_void)
 382
 383 /* Output any boilerplace text needed at the end of a
 384    translation unit before debug and unwind info is emitted.  */
 385 DEFHOOK
 386 (code_end,
 387  "",
 388  void, (void),
 389  hook_void_void)
 390
 391 /* Output an assembler pseudo-op to declare a library function name
 392    external.  */
 393 DEFHOOK
 394 (external_libcall,
 395  "",
 396  void, (rtx symref),
 397  default_external_libcall)
 398
 399 /* Output an assembler directive to mark decl live. This instructs
 400    linker to not dead code strip this symbol.  */
 401 DEFHOOK
 402 (mark_decl_preserved,
 403  "",
 404  void, (const char *symbol),
 405  hook_void_constcharptr)
 406
 407 /* Output a record of the command line switches that have been passed.  */
 408 DEFHOOK
 409 (record_gcc_switches,
 410  "",
 411  int, (print_switch_type type, const char *text),
 412  NULL)
 413
 414 /* The name of the section that the example ELF implementation of
 415    record_gcc_switches will use to store the information.  Target
 416    specific versions of record_gcc_switches may or may not use
 417    this information.  */
 418 DEFHOOKPOD
 419 (record_gcc_switches_section,
 420  "",
 421  const char *, ".GCC.command.line")
 422
 423 /* Output the definition of a section anchor.  */
 424 DEFHOOK
 425 (output_anchor,
 426  "",
 427  void, (rtx x),
 428  default_asm_output_anchor)
 429
 430 /* Output a DTP-relative reference to a TLS symbol.  */
 431 DEFHOOK
 432 (output_dwarf_dtprel,
 433  "",
 434  void, (FILE *file, int size, rtx x),
 435  NULL)
 436
 437 /* Some target machines need to postscan each insn after it is output.  */
 438 DEFHOOK
 439 (final_postscan_insn,
 440  "",
 441  void, (FILE *file, rtx insn, rtx *opvec, int noperands),
 442  NULL)
 443
 444 /* Emit the trampoline template.  This hook may be NULL.  */
 445 DEFHOOK
 446 (trampoline_template,
 447  "",
 448  void, (FILE *f),
 449  NULL)
 450
 451 DEFHOOK
 452 (output_source_filename,
 453  "Output COFF information or DWARF debugging information which indicates\
 454  that filename @var{name} is the current source file to the stdio\
 455  stream @var{file}.\n\
 456  \n\
 457  This target hook need not be defined if the standard form of output\
 458  for the file format in use is appropriate.",
 459  void ,(FILE *file, const char *name),
 460  default_asm_output_source_filename)
 461
 462 DEFHOOK
 463 (output_addr_const_extra,
 464  "",
 465  bool, (FILE *file, rtx x),
 466  hook_bool_FILEptr_rtx_false)
 467
 468 /* ??? The TARGET_PRINT_OPERAND* hooks are part of the asm_out struct,
 469    even though that is not reflected in the macro name to override their
 470    initializers.  */
 471 #undef HOOK_PREFIX
 472 #define HOOK_PREFIX "TARGET_"
 473
 474 /* Emit a machine-specific insn operand.  */
 475 /* ??? tm.texi only documents the old macro PRINT_OPERAND,
 476    not this  hook, and uses a different name for the argument FILE.  */
 477 DEFHOOK_UNDOC
 478 (print_operand,
 479  "",
 480  void, (FILE *file, rtx x, int code),
 481  default_print_operand)
 482
 483 /* Emit a machine-specific memory address.  */
 484 /* ??? tm.texi only documents the old macro PRINT_OPERAND_ADDRESS,
 485    not this  hook, and uses different argument names.  */
 486 DEFHOOK_UNDOC
 487 (print_operand_address,
 488  "",
 489  void, (FILE *file, rtx addr),
 490  default_print_operand_address)
 491
 492 /* Determine whether CODE is a valid punctuation character for the
 493    `print_operand' hook.  */
 494 /* ??? tm.texi only documents the old macro PRINT_OPERAND_PUNCT_VALID_P,
 495    not this  hook.  */
 496 DEFHOOK_UNDOC
 497 (print_operand_punct_valid_p,
 498  "",
 499  bool ,(unsigned char code),
 500  default_print_operand_punct_valid_p)
 501
 502 /* Given a symbol name, perform same mangling as assemble_name and
 503    ASM_OUTPUT_LABELREF, returning result as an IDENTIFIER_NODE.  */
 504 DEFHOOK
 505 (mangle_assembler_name,
 506  "Given a symbol @var{name}, perform same mangling as @code{varasm.c}'s\
 507  @code{assemble_name}, but in memory rather than to a file stream, returning\
 508  result as an @code{IDENTIFIER_NODE}.  Required for correct LTO symtabs.  The\
 509  default implementation calls the @code{TARGET_STRIP_NAME_ENCODING} hook and\
 510  then prepends the @code{USER_LABEL_PREFIX}, if any.",
 511  tree, (const char *name),
 512  default_mangle_assembler_name)
 513
 514 HOOK_VECTOR_END (asm_out)
 515
 516 /* Functions relating to instruction scheduling.  All of these
 517    default to null pointers, which haifa-sched.c looks for and handles.  */
 518 #undef HOOK_PREFIX
 519 #define HOOK_PREFIX "TARGET_SCHED_"
 520 HOOK_VECTOR (TARGET_SCHED, sched)
 521
 522 /* Given the current cost, COST, of an insn, INSN, calculate and
 523    return a new cost based on its relationship to DEP_INSN through
 524    the dependence LINK.  The default is to make no adjustment.  */
 525 DEFHOOK
 526 (adjust_cost,
 527  "",
 528  int, (rtx insn, rtx link, rtx dep_insn, int cost), NULL)
 529
 530 /* Adjust the priority of an insn as you see fit.  Returns the new priority.  */
 531 DEFHOOK
 532 (adjust_priority,
 533  "",
 534  int, (rtx insn, int priority), NULL)
 535
 536 /* Function which returns the maximum number of insns that can be
 537    scheduled in the same machine cycle.  This must be constant
 538    over an entire compilation.  The default is 1.  */
 539 DEFHOOK
 540 (issue_rate,
 541  "",
 542  int, (void), NULL)
 543
 544 /* Calculate how much this insn affects how many more insns we
 545    can emit this cycle.  Default is they all cost the same.  */
 546 DEFHOOK
 547 (variable_issue,
 548  "",
 549  int, (FILE *file, int verbose, rtx insn, int more), NULL)
 550
 551 /* Initialize machine-dependent scheduling code.  */
 552 DEFHOOK
 553 (init,
 554  "",
 555  void, (FILE *file, int verbose, int max_ready), NULL)
 556
 557 /* Finalize machine-dependent scheduling code.  */
 558 DEFHOOK
 559 (finish,
 560  "",
 561  void, (FILE *file, int verbose), NULL)
 562
 563  /* Initialize machine-dependent function wide scheduling code.  */
 564 DEFHOOK
 565 (init_global,
 566  "",
 567  void, (FILE *file, int verbose, int old_max_uid), NULL)
 568
 569 /* Finalize machine-dependent function wide scheduling code.  */
 570 DEFHOOK
 571 (finish_global,
 572  "",
 573  void, (FILE *file, int verbose), NULL)
 574
 575 /* Reorder insns in a machine-dependent fashion, in two different
 576        places.  Default does nothing.  */
 577 DEFHOOK
 578 (reorder,
 579  "",
 580  int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
 581
 582 DEFHOOK
 583 (reorder2,
 584  "",
 585  int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
 586
 587 /* The following member value is a pointer to a function called
 588    after evaluation forward dependencies of insns in chain given
 589    by two parameter values (head and tail correspondingly).  */
 590 DEFHOOK
 591 (dependencies_evaluation_hook,
 592  "",
 593  void, (rtx head, rtx tail), NULL)
 594
 595 /* The values of the following four members are pointers to functions
 596    used to simplify the automaton descriptions.  dfa_pre_cycle_insn and
 597    dfa_post_cycle_insn give functions returning insns which are used to
 598    change the pipeline hazard recognizer state when the new simulated
 599    processor cycle correspondingly starts and finishes.  The function
 600    defined by init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are
 601    used to initialize the corresponding insns.  The default values of
 602    the members result in not changing the automaton state when the
 603    new simulated processor cycle correspondingly starts and finishes.  */
 604
 605 DEFHOOK
 606 (init_dfa_pre_cycle_insn,
 607  "",
 608  void, (void), NULL)
 609
 610 DEFHOOK
 611 (dfa_pre_cycle_insn,
 612  "",
 613  rtx, (void), NULL)
 614
 615 DEFHOOK
 616 (init_dfa_post_cycle_insn,
 617  "",
 618  void, (void), NULL)
 619
 620 DEFHOOK
 621 (dfa_post_cycle_insn,
 622  "",
 623  rtx, (void), NULL)
 624
 625 /* The values of the following two members are pointers to
 626    functions used to simplify the automaton descriptions.
 627    dfa_pre_advance_cycle and dfa_post_advance_cycle are getting called
 628    immediately before and after cycle is advanced.  */
 629
 630 DEFHOOK
 631 (dfa_pre_advance_cycle,
 632  "",
 633  void, (void), NULL)
 634
 635 DEFHOOK
 636 (dfa_post_advance_cycle,
 637  "",
 638  void, (void), NULL)
 639
 640 /* The following member value is a pointer to a function returning value
 641    which defines how many insns in queue `ready' will we try for
 642    multi-pass scheduling.  If the member value is nonzero and the
 643    function returns positive value, the DFA based scheduler will make
 644    multi-pass scheduling for the first cycle.  In other words, we will
 645    try to choose ready insn which permits to start maximum number of
 646    insns on the same cycle.  */
 647 DEFHOOK
 648 (first_cycle_multipass_dfa_lookahead,
 649  "",
 650  int, (void), NULL)
 651
 652 /* The following member value is pointer to a function controlling
 653    what insns from the ready insn queue will be considered for the
 654    multipass insn scheduling.  If the hook returns zero for insn
 655    passed as the parameter, the insn will be not chosen to be issued.  */
 656 DEFHOOK
 657 (first_cycle_multipass_dfa_lookahead_guard,
 658  "",
 659  int, (rtx insn), NULL)
 660
 661 /* This hook prepares the target for a new round of multipass
 662    scheduling.
 663    DATA is a pointer to target-specific data used for multipass scheduling.
 664    READY_TRY and N_READY represent the current state of search in the
 665    optimization space.  The target can filter out instructions that
 666    should not be tried during current round by setting corresponding
 667    elements in READY_TRY to non-zero.
 668    FIRST_CYCLE_INSN_P is true if this is the first round of multipass
 669    scheduling on current cycle.  */
 670 DEFHOOK
 671 (first_cycle_multipass_begin,
 672  "",
 673  void, (void *data, char *ready_try, int n_ready, bool first_cycle_insn_p),
 674  NULL)
 675
 676 /* This hook is called when multipass scheduling evaluates instruction INSN.
 677    DATA is a pointer to target-specific data that can be used to record effects
 678    of INSN on CPU that are not described in DFA.
 679    READY_TRY and N_READY represent the current state of search in the
 680    optimization space.  The target can filter out instructions that
 681    should not be tried after issueing INSN by setting corresponding
 682    elements in READY_TRY to non-zero.
 683    INSN is the instruction being evaluated.
 684    PREV_DATA is a pointer to target-specific data corresponding
 685    to a state before issueing INSN.  */
 686 DEFHOOK
 687 (first_cycle_multipass_issue,
 688  "",
 689  void, (void *data, char *ready_try, int n_ready, rtx insn,
 690         const void *prev_data), NULL)
 691
 692 /* This hook is called when multipass scheduling backtracks from evaluation of
 693    instruction corresponding to DATA.
 694    DATA is a pointer to target-specific data that stores the effects
 695    of instruction from which the algorithm backtracks on CPU that are not
 696    described in DFA.
 697    READY_TRY and N_READY represent the current state of search in the
 698    optimization space.  The target can filter out instructions that
 699    should not be tried after issueing INSN by setting corresponding
 700    elements in READY_TRY to non-zero.  */
 701 DEFHOOK
 702 (first_cycle_multipass_backtrack,
 703  "",
 704  void, (const void *data, char *ready_try, int n_ready), NULL)
 705
 706 /* This hook notifies the target about the result of the concluded current
 707    round of multipass scheduling.
 708    DATA is a pointer.
 709    If DATA is non-NULL it points to target-specific data used for multipass
 710    scheduling which corresponds to instruction at the start of the chain of
 711    the winning solution.  DATA is NULL when multipass scheduling cannot find
 712    a good enough solution on current cycle and decides to retry later,
 713    usually after advancing the cycle count.  */
 714 DEFHOOK
 715 (first_cycle_multipass_end,
 716  "",
 717  void, (const void *data), NULL)
 718
 719 /* This hook is called to initialize target-specific data for multipass
 720    scheduling after it has been allocated.
 721    DATA is a pointer to target-specific data that stores the effects
 722    of instruction from which the algorithm backtracks on CPU that are not
 723    described in DFA.  */
 724 DEFHOOK
 725 (first_cycle_multipass_init,
 726  "",
 727  void, (void *data), NULL)
 728
 729 /* This hook is called to finalize target-specific data for multipass
 730    scheduling before it is deallocated.
 731    DATA is a pointer to target-specific data that stores the effects
 732    of instruction from which the algorithm backtracks on CPU that are not
 733    described in DFA.  */
 734 DEFHOOK
 735 (first_cycle_multipass_fini,
 736  "",
 737  void, (void *data), NULL)
 738
 739 /* The following member value is pointer to a function called by
 740    the insn scheduler before issuing insn passed as the third
 741    parameter on given cycle.  If the hook returns nonzero, the
 742    insn is not issued on given processors cycle.  Instead of that,
 743    the processor cycle is advanced.  If the value passed through
 744    the last parameter is zero, the insn ready queue is not sorted
 745    on the new cycle start as usually.  The first parameter passes
 746    file for debugging output.  The second one passes the scheduler
 747    verbose level of the debugging output.  The forth and the fifth
 748    parameter values are correspondingly processor cycle on which
 749    the previous insn has been issued and the current processor cycle.  */
 750 DEFHOOK
 751 (dfa_new_cycle,
 752  "",
 753  int, (FILE *dump, int verbose, rtx insn, int last_clock,
 754        int clock, int *sort_p),
 755  NULL)
 756
 757 /* The following member value is a pointer to a function called by the
 758    insn scheduler.  It should return true if there exists a dependence
 759    which is considered costly by the target, between the insn
 760    DEP_PRO (&_DEP), and the insn DEP_CON (&_DEP).  The first parameter is
 761    the dep that represents the dependence between the two insns.  The
 762    second argument is the cost of the dependence as estimated by
 763    the scheduler.  The last argument is the distance in cycles
 764    between the already scheduled insn (first parameter) and the
 765    second insn (second parameter).  */
 766 DEFHOOK
 767 (is_costly_dependence,
 768  "",
 769  bool, (struct _dep *_dep, int cost, int distance), NULL)
 770
 771 DEFHOOK_UNDOC
 772 (adjust_cost_2,
 773  "Given the current cost, @var{cost}, of an insn, @var{insn}, calculate and\
 774  return a new cost based on its relationship to @var{dep_insn} through the\
 775  dependence of weakness @var{dw}.  The default is to make no adjustment.",
 776  int, (rtx insn, int dep_type1, rtx dep_insn, int cost, int dw), NULL)
 777
 778 /* The following member value is a pointer to a function called
 779    by the insn scheduler. This hook is called to notify the backend
 780    that new instructions were emitted.  */
 781 DEFHOOK
 782 (h_i_d_extended,
 783  "",
 784  void, (void), NULL)
 785
 786 /* Next 5 functions are for multi-point scheduling.  */
 787
 788 /* Allocate memory for scheduler context.  */
 789 DEFHOOK
 790 (alloc_sched_context,
 791  "",
 792  void *, (void), NULL)
 793
 794 /* Fills the context from the local machine scheduler context.  */
 795 DEFHOOK
 796 (init_sched_context,
 797  "",
 798  void, (void *tc, bool clean_p), NULL)
 799
 800 /* Sets local machine scheduler context to a saved value.  */
 801 DEFHOOK
 802 (set_sched_context,
 803  "",
 804  void, (void *tc), NULL)
 805
 806 /* Clears a scheduler context so it becomes like after init.  */
 807 DEFHOOK
 808 (clear_sched_context,
 809  "",
 810  void, (void *tc), NULL)
 811
 812 /* Frees the scheduler context.  */
 813 DEFHOOK
 814 (free_sched_context,
 815  "",
 816  void, (void *tc), NULL)
 817
 818 /* The following member value is a pointer to a function called
 819    by the insn scheduler.
 820    The first parameter is an instruction, the second parameter is the type
 821    of the requested speculation, and the third parameter is a pointer to the
 822    speculative pattern of the corresponding type (set if return value == 1).
 823    It should return
 824    -1, if there is no pattern, that will satisfy the requested speculation type,
 825    0, if current pattern satisfies the requested speculation type,
 826    1, if pattern of the instruction should be changed to the newly
 827    generated one.  */
 828 DEFHOOK
 829 (speculate_insn,
 830  "",
 831  int, (rtx insn, int request, rtx *new_pat), NULL)
 832
 833 /* The following member value is a pointer to a function called
 834    by the insn scheduler.  It should return true if the check instruction
 835    passed as the parameter needs a recovery block.  */
 836 DEFHOOK
 837 (needs_block_p,
 838  "",
 839  bool, (int dep_status), NULL)
 840
 841 /* The following member value is a pointer to a function called
 842    by the insn scheduler.  It should return a pattern for the check
 843    instruction.
 844    The first parameter is a speculative instruction, the second parameter
 845    is the label of the corresponding recovery block (or null, if it is a
 846    simple check).  If the mutation of the check is requested (e.g. from
 847    ld.c to chk.a), the third parameter is true - in this case the first
 848    parameter is the previous check.  */
 849 DEFHOOK
 850 (gen_spec_check,
 851  "",
 852  rtx, (rtx insn, rtx label, int mutate_p), NULL)
 853
 854 /* The following member value is a pointer to a function controlling
 855    what insns from the ready insn queue will be considered for the
 856    multipass insn scheduling.  If the hook returns zero for the insn
 857    passed as the parameter, the insn will not be chosen to be
 858    issued.  This hook is used to discard speculative instructions,
 859    that stand at the first position of the ready list.  */
 860 DEFHOOK
 861 (first_cycle_multipass_dfa_lookahead_guard_spec,
 862  "",
 863  bool, (const_rtx insn), NULL)
 864
 865 /* The following member value is a pointer to a function that provides
 866    information about the speculation capabilities of the target.
 867    The parameter is a pointer to spec_info variable.  */
 868 DEFHOOK
 869 (set_sched_flags,
 870  "",
 871  void, (struct spec_info_def *spec_info), NULL)
 872
 873 DEFHOOK_UNDOC
 874 (get_insn_spec_ds,
 875  "Return speculation types of instruction @var{insn}.",
 876  int, (rtx insn), NULL)
 877
 878 DEFHOOK_UNDOC
 879 (get_insn_checked_ds,
 880  "Return speculation types that are checked for instruction @var{insn}",
 881  int, (rtx insn), NULL)
 882
 883 DEFHOOK_UNDOC
 884 (skip_rtx_p,
 885  "Return bool if rtx scanning should just skip current layer and\
 886  advance to the inner rtxes.",
 887  bool, (const_rtx x), NULL)
 888
 889 /* The following member value is a pointer to a function that provides
 890    information about the target resource-based lower bound which is
 891    used by the swing modulo scheduler.  The parameter is a pointer
 892    to ddg variable.  */
 893 DEFHOOK
 894 (sms_res_mii,
 895  "",
 896  int, (struct ddg *g), NULL)
 897
 898 /* The following member value is a function that initializes dispatch
 899    schedling and adds instructions to dispatch window according to its
 900    parameters.  */
 901 DEFHOOK
 902 (dispatch_do,
 903 "",
 904 void, (rtx insn, int x),
 905 hook_void_rtx_int)
 906
 907 /* The following member value is a a function that returns true is
 908    dispatch schedling is supported in hardware and condition passed
 909    as the second parameter is true.  */
 910 DEFHOOK
 911 (dispatch,
 912 "",
 913 bool, (rtx insn, int x),
 914 hook_bool_rtx_int_false)
 915
 916 DEFHOOKPOD
 917 (exposed_pipeline,
 918 "True if the processor has an exposed pipeline, which means that not just\n\
 919 the order of instructions is important for correctness when scheduling, but\n\
 920 also the latencies of operations.",
 921 bool, false)
 922
 923 /* The following member value is a function that returns number
 924    of operations reassociator should try to put in parallel for
 925    statements of the given type.  By default 1 is used.  */
 926 DEFHOOK
 927 (reassociation_width,
 928 "This hook is called by tree reassociator to determine a level of\n\
 929 parallelism required in output calculations chain.",
 930 int, (unsigned int opc, enum machine_mode mode),
 931 hook_int_uint_mode_1)
 932
 933 HOOK_VECTOR_END (sched)
 934
 935 /* Functions relating to vectorization.  */
 936 #undef HOOK_PREFIX
 937 #define HOOK_PREFIX "TARGET_VECTORIZE_"
 938 HOOK_VECTOR (TARGET_VECTORIZE, vectorize)
 939
 940 /* The following member value is a pointer to a function called
 941    by the vectorizer, and return the decl of the target builtin
 942    function.  */
 943 DEFHOOK
 944 (builtin_mask_for_load,
 945  "",
 946  tree, (void), NULL)
 947
 948 /* Returns a code for builtin that realizes vectorized version of
 949    function, or NULL_TREE if not available.  */
 950 DEFHOOK
 951 (builtin_vectorized_function,
 952  "",
 953  tree, (tree fndecl, tree vec_type_out, tree vec_type_in),
 954  default_builtin_vectorized_function)
 955
 956 /* Returns a function declaration for a builtin that realizes the
 957    vector conversion, or NULL_TREE if not available.  */
 958 DEFHOOK
 959 (builtin_conversion,
 960  "",
 961  tree, (unsigned code, tree dest_type, tree src_type),
 962  default_builtin_vectorized_conversion)
 963
 964 /* Target builtin that implements vector widening multiplication.
 965    builtin_mul_widen_eve computes the element-by-element products
 966    for the even elements, and builtin_mul_widen_odd computes the
 967    element-by-element products for the odd elements.  */
 968 DEFHOOK
 969 (builtin_mul_widen_even,
 970  "",
 971  tree, (tree x), NULL)
 972
 973 DEFHOOK
 974 (builtin_mul_widen_odd,
 975  "",
 976  tree, (tree x), NULL)
 977
 978 /* Cost of different vector/scalar statements in vectorization cost
 979    model. In case of misaligned vector loads and stores the cost depends
 980    on the data type and misalignment value.  */
 981 DEFHOOK
 982 (builtin_vectorization_cost,
 983  "",
 984  int, (enum vect_cost_for_stmt type_of_cost, tree vectype, int misalign),
 985  default_builtin_vectorization_cost)
 986
 987 /* Return true if vector alignment is reachable (by peeling N
 988    iterations) for the given type.  */
 989 DEFHOOK
 990 (vector_alignment_reachable,
 991  "",
 992  bool, (const_tree type, bool is_packed),
 993  default_builtin_vector_alignment_reachable)
 994
 995 /* Return true if a vector created for vec_perm_const is valid.
 996    A NULL indicates that all constants are valid permutations.  */
 997 DEFHOOK
 998 (vec_perm_const_ok,
 999  "",
1000  bool, (enum machine_mode, const unsigned char *sel),
1001  NULL)
1002
1003 /* Return true if the target supports misaligned store/load of a
1004    specific factor denoted in the third parameter.  The last parameter
1005    is true if the access is defined in a packed struct.  */
1006 DEFHOOK
1007 (support_vector_misalignment,
1008  "",
1009  bool,
1010  (enum machine_mode mode, const_tree type, int misalignment, bool is_packed),
1011  default_builtin_support_vector_misalignment)
1012
1013 /* Return the builtin decl needed to load a vector of TYPE.  */
1014 DEFHOOK
1015 (builtin_tm_load,
1016  "This hook should return the built-in decl needed to load a vector of the "
1017  "given type within a transaction.",
1018  tree,
1019  (tree),
1020  default_builtin_tm_load_store)
1021
1022 /* Return the builtin decl needed to store a vector of TYPE.  */
1023 DEFHOOK
1024 (builtin_tm_store,
1025  "This hook should return the built-in decl needed to store a vector of the "
1026  "given type within a transaction.",
1027  tree,
1028  (tree),
1029  default_builtin_tm_load_store)
1030
1031 /* Returns the preferred mode for SIMD operations for the specified
1032    scalar mode.  */
1033 DEFHOOK
1034 (preferred_simd_mode,
1035  "",
1036  enum machine_mode,
1037  (enum machine_mode mode),
1038  default_preferred_simd_mode)
1039
1040 /* Returns a mask of vector sizes to iterate over when auto-vectorizing
1041    after processing the preferred one derived from preferred_simd_mode.  */
1042 DEFHOOK
1043 (autovectorize_vector_sizes,
1044  "",
1045  unsigned int,
1046  (void),
1047  default_autovectorize_vector_sizes)
1048
1049 /* Target builtin that implements vector gather operation.  */
1050 DEFHOOK
1051 (builtin_gather,
1052  "",
1053  tree,
1054  (const_tree mem_vectype, const_tree index_type, int scale),
1055  NULL)
1056
1057 HOOK_VECTOR_END (vectorize)
1058
1059 #undef HOOK_PREFIX
1060 #define HOOK_PREFIX "TARGET_"
1061
1062 /* Allow target specific overriding of option settings after options have
1063   been changed by an attribute or pragma or when it is reset at the
1064   end of the code affected by an attribute or pragma.  */
1065 DEFHOOK
1066 (override_options_after_change,
1067  "",
1068  void, (void),
1069  hook_void_void)
1070
1071 DEFHOOK_UNDOC
1072 (eh_return_filter_mode,
1073  "Return machine mode for filter value.",
1074  enum machine_mode, (void),
1075  default_eh_return_filter_mode)
1076
1077 /* Return machine mode for libgcc expanded cmp instructions.  */
1078 DEFHOOK
1079 (libgcc_cmp_return_mode,
1080  "",
1081  enum machine_mode, (void),
1082  default_libgcc_cmp_return_mode)
1083
1084 /* Return machine mode for libgcc expanded shift instructions.  */
1085 DEFHOOK
1086 (libgcc_shift_count_mode,
1087  "",
1088  enum machine_mode, (void),
1089  default_libgcc_shift_count_mode)
1090
1091 /* Return machine mode to be used for _Unwind_Word type.  */
1092 DEFHOOK
1093 (unwind_word_mode,
1094  "",
1095  enum machine_mode, (void),
1096  default_unwind_word_mode)
1097
1098 /* Given two decls, merge their attributes and return the result.  */
1099 DEFHOOK
1100 (merge_decl_attributes,
1101  "",
1102  tree, (tree olddecl, tree newdecl),
1103  merge_decl_attributes)
1104
1105 /* Given two types, merge their attributes and return the result.  */
1106 DEFHOOK
1107 (merge_type_attributes,
1108  "",
1109  tree, (tree type1, tree type2),
1110  merge_type_attributes)
1111
1112 /* Table of machine attributes and functions to handle them.
1113    Ignored if NULL.  */
1114 DEFHOOKPOD
1115 (attribute_table,
1116  "",
1117  const struct attribute_spec *, NULL)
1118
1119 /* Return true iff attribute NAME expects a plain identifier as its first
1120    argument.  */
1121 DEFHOOK
1122 (attribute_takes_identifier_p,
1123  "",
1124  bool, (const_tree name),
1125  hook_bool_const_tree_false)
1126
1127 /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
1128    one if they are compatible and two if they are nearly compatible
1129    (which causes a warning to be generated).  */
1130 DEFHOOK
1131 (comp_type_attributes,
1132  "",
1133  int, (const_tree type1, const_tree type2),
1134  hook_int_const_tree_const_tree_1)
1135
1136 /* Assign default attributes to the newly defined TYPE.  */
1137 DEFHOOK
1138 (set_default_type_attributes,
1139  "",
1140  void, (tree type),
1141  hook_void_tree)
1142
1143 /* Insert attributes on the newly created DECL.  */
1144 DEFHOOK
1145 (insert_attributes,
1146  "",
1147  void, (tree node, tree *attr_ptr),
1148  hook_void_tree_treeptr)
1149
1150 /* Return true if FNDECL (which has at least one machine attribute)
1151    can be inlined despite its machine attributes, false otherwise.  */
1152 DEFHOOK
1153 (function_attribute_inlinable_p,
1154  "",
1155  bool, (const_tree fndecl),
1156  hook_bool_const_tree_false)
1157
1158 /* Return true if bitfields in RECORD_TYPE should follow the
1159    Microsoft Visual C++ bitfield layout rules.  */
1160 DEFHOOK
1161 (ms_bitfield_layout_p,
1162  "",
1163  bool, (const_tree record_type),
1164  hook_bool_const_tree_false)
1165
1166 /* For now this is only an interface to WORDS_BIG_ENDIAN for
1167    target-independent code like the front ends, need performance testing
1168    before switching completely to the target hook.  */
1169 DEFHOOK_UNDOC
1170 (words_big_endian,
1171  "",
1172  bool, (void),
1173  targhook_words_big_endian)
1174
1175 /* Likewise for FLOAT_WORDS_BIG_ENDIAN.  */
1176 DEFHOOK_UNDOC
1177 (float_words_big_endian,
1178  "",
1179  bool, (void),
1180  targhook_float_words_big_endian)
1181
1182 /* True if the target supports decimal floating point.  */
1183 DEFHOOK
1184 (decimal_float_supported_p,
1185  "",
1186  bool, (void),
1187  default_decimal_float_supported_p)
1188
1189 /* True if the target supports fixed-point.  */
1190 DEFHOOK
1191 (fixed_point_supported_p,
1192  "",
1193  bool, (void),
1194  default_fixed_point_supported_p)
1195
1196 /* Return true if anonymous bitfields affect structure alignment.  */
1197 DEFHOOK
1198 (align_anon_bitfield,
1199  "",
1200  bool, (void),
1201  hook_bool_void_false)
1202
1203 /* Return true if volatile bitfields should use the narrowest type possible.
1204    Return false if they should use the container type.  */
1205 DEFHOOK
1206 (narrow_volatile_bitfield,
1207  "",
1208  bool, (void),
1209  hook_bool_void_false)
1210
1211 /* Set up target-specific built-in functions.  */
1212 DEFHOOK
1213 (init_builtins,
1214  "",
1215  void, (void),
1216  hook_void_void)
1217
1218 /* Initialize (if INITIALIZE_P is true) and return the target-specific
1219    built-in function decl for CODE.
1220    Return NULL if that is not possible.  Return error_mark_node if CODE
1221    is outside of the range of valid target builtin function codes.  */
1222 DEFHOOK
1223 (builtin_decl,
1224  "",
1225  tree, (unsigned code, bool initialize_p), NULL)
1226
1227 /* Expand a target-specific builtin.  */
1228 DEFHOOK
1229 (expand_builtin,
1230  "",
1231  rtx,
1232  (tree exp, rtx target, rtx subtarget, enum machine_mode mode, int ignore),
1233  default_expand_builtin)
1234
1235 /* Select a replacement for a target-specific builtin.  This is done
1236    *before* regular type checking, and so allows the target to
1237    implement a crude form of function overloading.  The result is a
1238    complete expression that implements the operation.  PARAMS really
1239    has type VEC(tree,gc)*, but we don't want to include tree.h here.  */
1240 DEFHOOK
1241 (resolve_overloaded_builtin,
1242  "",
1243  tree, (unsigned int /*location_t*/ loc, tree fndecl, void *arglist), NULL)
1244
1245 /* Fold a target-specific builtin.  */
1246 DEFHOOK
1247 (fold_builtin,
1248  "",
1249  tree, (tree fndecl, int n_args, tree *argp, bool ignore),
1250  hook_tree_tree_int_treep_bool_null)
1251
1252 /* Returns a code for a target-specific builtin that implements
1253    reciprocal of the function, or NULL_TREE if not available.  */
1254 DEFHOOK
1255 (builtin_reciprocal,
1256  "",
1257  tree, (unsigned fn, bool md_fn, bool sqrt),
1258  default_builtin_reciprocal)
1259
1260 /* For a vendor-specific TYPE, return a pointer to a statically-allocated
1261    string containing the C++ mangling for TYPE.  In all other cases, return
1262    NULL.  */
1263 DEFHOOK
1264 (mangle_type,
1265  "",
1266  const char *, (const_tree type),
1267  hook_constcharptr_const_tree_null)
1268
1269 /* Make any adjustments to libfunc names needed for this target.  */
1270 DEFHOOK
1271 (init_libfuncs,
1272  "",
1273  void, (void),
1274  hook_void_void)
1275
1276  /* Add a __gnu_ prefix to library functions rather than just __.  */
1277 DEFHOOKPOD
1278 (libfunc_gnu_prefix,
1279  "If false (the default), internal library routines start with two\n\
1280 underscores.  If set to true, these routines start with @code{__gnu_}\n\
1281 instead.  E.g., @code{__muldi3} changes to @code{__gnu_muldi3}.  This\n\
1282 currently only affects functions defined in @file{libgcc2.c}.  If this\n\
1283 is set to true, the @file{tm.h} file must also\n\
1284 @code{#define LIBGCC2_GNU_PREFIX}.",
1285   bool, false)
1286
1287 /* Given a decl, a section name, and whether the decl initializer
1288    has relocs, choose attributes for the section.  */
1289 /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION.  */
1290 DEFHOOK
1291 (section_type_flags,
1292  "",
1293  unsigned int, (tree decl, const char *name, int reloc),
1294  default_section_type_flags)
1295
1296 /* True if new jumps cannot be created, to replace existing ones or
1297    not, at the current point in the compilation.  */
1298 DEFHOOK
1299 (cannot_modify_jumps_p,
1300  "",
1301  bool, (void),
1302  hook_bool_void_false)
1303
1304 /* Return a register class for which branch target register
1305    optimizations should be applied.  */
1306 DEFHOOK
1307 (branch_target_register_class,
1308  "",
1309  reg_class_t, (void),
1310  default_branch_target_register_class)
1311
1312 /* Return true if branch target register optimizations should include
1313    callee-saved registers that are not already live during the current
1314    function.  AFTER_PE_GEN is true if prologues and epilogues have
1315    already been generated.  */
1316 DEFHOOK
1317 (branch_target_register_callee_saved,
1318  "",
1319  bool, (bool after_prologue_epilogue_gen),
1320  hook_bool_bool_false)
1321
1322 /* Return true if the target supports conditional execution.  */
1323 DEFHOOK
1324 (have_conditional_execution,
1325  "",
1326  bool, (void),
1327  default_have_conditional_execution)
1328
1329 /* Return a new value for loop unroll size.  */
1330 DEFHOOK
1331 (loop_unroll_adjust,
1332  "",
1333  unsigned, (unsigned nunroll, struct loop *loop),
1334  NULL)
1335
1336 /* True if X is a legitimate MODE-mode immediate operand.  */
1337 DEFHOOK
1338 (legitimate_constant_p,
1339  "",
1340  bool, (enum machine_mode mode, rtx x),
1341  hook_bool_mode_rtx_true)
1342
1343 /* True if the constant X cannot be placed in the constant pool.  */
1344 DEFHOOK
1345 (cannot_force_const_mem,
1346  "",
1347  bool, (enum machine_mode mode, rtx x),
1348  hook_bool_mode_rtx_false)
1349
1350 DEFHOOK_UNDOC
1351 (cannot_copy_insn_p,
1352  "True if the insn @var{x} cannot be duplicated.",
1353  bool, (rtx), NULL)
1354
1355 /* True if X is considered to be commutative.  */
1356 DEFHOOK
1357 (commutative_p,
1358  "",
1359  bool, (const_rtx x, int outer_code),
1360  hook_bool_const_rtx_commutative_p)
1361
1362 /* True if ADDR is an address-expression whose effect depends
1363    on the mode of the memory reference it is used in.  */
1364 DEFHOOK
1365 (mode_dependent_address_p,
1366  "",
1367  bool, (const_rtx addr),
1368  default_mode_dependent_address_p)
1369
1370 /* Given an invalid address X for a given machine mode, try machine-specific
1371    ways to make it legitimate.  Return X or an invalid address on failure.  */
1372 DEFHOOK
1373 (legitimize_address,
1374  "",
1375  rtx, (rtx x, rtx oldx, enum machine_mode mode),
1376  default_legitimize_address)
1377
1378 /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS.  */
1379 DEFHOOK
1380 (delegitimize_address,
1381  "",
1382  rtx, (rtx x),
1383  delegitimize_mem_from_attrs)
1384
1385 /* Given an address RTX, say whether it is valid.  */
1386 DEFHOOK
1387 (legitimate_address_p,
1388  "",
1389  bool, (enum machine_mode mode, rtx x, bool strict),
1390  default_legitimate_address_p)
1391
1392 /* True if the given constant can be put into an object_block.  */
1393 DEFHOOK
1394 (use_blocks_for_constant_p,
1395  "",
1396  bool, (enum machine_mode mode, const_rtx x),
1397  hook_bool_mode_const_rtx_false)
1398
1399 /* The minimum and maximum byte offsets for anchored addresses.  */
1400 DEFHOOKPOD
1401 (min_anchor_offset,
1402  "",
1403  HOST_WIDE_INT, 0)
1404
1405 DEFHOOKPOD
1406 (max_anchor_offset,
1407  "",
1408  HOST_WIDE_INT, 0)
1409
1410 /* True if section anchors can be used to access the given symbol.  */
1411 DEFHOOK
1412 (use_anchors_for_symbol_p,
1413  "",
1414  bool, (const_rtx x),
1415  default_use_anchors_for_symbol_p)
1416
1417 /* True if it is OK to do sibling call optimization for the specified
1418    call expression EXP.  DECL will be the called function, or NULL if
1419    this is an indirect call.  */
1420 DEFHOOK
1421 (function_ok_for_sibcall,
1422  "",
1423  bool, (tree decl, tree exp),
1424  hook_bool_tree_tree_false)
1425
1426 /* Establish appropriate back-end context for processing the function
1427    FNDECL.  The argument might be NULL to indicate processing at top
1428    level, outside of any function scope.  */
1429 DEFHOOK
1430 (set_current_function,
1431  "",
1432  void, (tree decl), hook_void_tree)
1433
1434 /* True if EXP should be placed in a "small data" section.  */
1435 DEFHOOK
1436 (in_small_data_p,
1437  "",
1438  bool, (const_tree exp),
1439  hook_bool_const_tree_false)
1440
1441 /* True if EXP names an object for which name resolution must resolve
1442    to the current executable or shared library.  */
1443 DEFHOOK
1444 (binds_local_p,
1445  "",
1446  bool, (const_tree exp),
1447  default_binds_local_p)
1448
1449 /* Check if profiling code is before or after prologue.  */
1450 DEFHOOK
1451 (profile_before_prologue,
1452  "It returns true if target wants profile code emitted before prologue.\n\n\
1453 The default version of this hook use the target macro\n\
1454 @code{PROFILE_BEFORE_PROLOGUE}.",
1455  bool, (void),
1456  default_profile_before_prologue)
1457
1458 /* Modify and return the identifier of a DECL's external name,
1459    originally identified by ID, as required by the target,
1460    (eg, append @nn to windows32 stdcall function names).
1461    The default is to return ID without modification. */
1462 DEFHOOK
1463 (mangle_decl_assembler_name,
1464  "",
1465  tree, (tree decl, tree  id),
1466  default_mangle_decl_assembler_name)
1467
1468 /* Do something target-specific to record properties of the DECL into
1469    the associated SYMBOL_REF.  */
1470 DEFHOOK
1471 (encode_section_info,
1472  "",
1473  void, (tree decl, rtx rtl, int new_decl_p),
1474  default_encode_section_info)
1475
1476 /* Undo the effects of encode_section_info on the symbol string.  */
1477 DEFHOOK
1478 (strip_name_encoding,
1479  "",
1480  const char *, (const char *name),
1481  default_strip_name_encoding)
1482
1483 /* If shift optabs for MODE are known to always truncate the shift count,
1484    return the mask that they apply.  Return 0 otherwise.  */
1485 DEFHOOK
1486 (shift_truncation_mask,
1487  "",
1488  unsigned HOST_WIDE_INT, (enum machine_mode mode),
1489  default_shift_truncation_mask)
1490
1491 /* Return the number of divisions in the given MODE that should be present,
1492    so that it is profitable to turn the division into a multiplication by
1493    the reciprocal.  */
1494 DEFHOOK
1495 (min_divisions_for_recip_mul,
1496  "",
1497  unsigned int, (enum machine_mode mode),
1498  default_min_divisions_for_recip_mul)
1499
1500 /* If the representation of integral MODE is such that values are
1501    always sign-extended to a wider mode MODE_REP then return
1502    SIGN_EXTEND.  Return UNKNOWN otherwise.  */
1503 /* Note that the return type ought to be RTX_CODE, but that's not
1504    necessarily defined at this point.  */
1505 DEFHOOK
1506 (mode_rep_extended,
1507  "",
1508  int, (enum machine_mode mode, enum machine_mode rep_mode),
1509  default_mode_rep_extended)
1510
1511 /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))).  */
1512 DEFHOOK
1513 (valid_pointer_mode,
1514  "",
1515  bool, (enum machine_mode mode),
1516  default_valid_pointer_mode)
1517
1518 /* Disambiguate with errno.  */
1519 DEFHOOK
1520 (ref_may_alias_errno,
1521  "Define this to return nonzero if the memory reference @var{ref}\
1522   may alias with the system C library errno location.  The default\
1523   version of this hook assumes the system C library errno location\
1524   is either a declaration of type int or accessed by dereferencing\
1525   a pointer to int.",
1526  bool, (struct ao_ref_s *ref),
1527  default_ref_may_alias_errno)
1528
1529 /* Support for named address spaces.  */
1530 #undef HOOK_PREFIX
1531 #define HOOK_PREFIX "TARGET_ADDR_SPACE_"
1532 HOOK_VECTOR (TARGET_ADDR_SPACE_HOOKS, addr_space)
1533
1534 /* MODE to use for a pointer into another address space.  */
1535 DEFHOOK
1536 (pointer_mode,
1537  "",
1538  enum machine_mode, (addr_space_t address_space),
1539  default_addr_space_pointer_mode)
1540
1541 /* MODE to use for an address in another address space.  */
1542 DEFHOOK
1543 (address_mode,
1544  "",
1545  enum machine_mode, (addr_space_t address_space),
1546  default_addr_space_address_mode)
1547
1548 /* True if MODE is valid for a pointer in __attribute__((mode("MODE")))
1549    in another address space.  */
1550 DEFHOOK
1551 (valid_pointer_mode,
1552  "",
1553  bool, (enum machine_mode mode, addr_space_t as),
1554  default_addr_space_valid_pointer_mode)
1555
1556 /* True if an address is a valid memory address to a given named address
1557    space for a given mode.  */
1558 DEFHOOK
1559 (legitimate_address_p,
1560  "",
1561  bool, (enum machine_mode mode, rtx exp, bool strict, addr_space_t as),
1562  default_addr_space_legitimate_address_p)
1563
1564 /* Return an updated address to convert an invalid pointer to a named
1565    address space to a valid one.  If NULL_RTX is returned use machine
1566    independent methods to make the address valid.  */
1567 DEFHOOK
1568 (legitimize_address,
1569  "",
1570  rtx, (rtx x, rtx oldx, enum machine_mode mode, addr_space_t as),
1571  default_addr_space_legitimize_address)
1572
1573 /* True if one named address space is a subset of another named address. */
1574 DEFHOOK
1575 (subset_p,
1576  "",
1577  bool, (addr_space_t subset, addr_space_t superset),
1578  default_addr_space_subset_p)
1579
1580 /* Function to convert an rtl expression from one address space to another.  */
1581 DEFHOOK
1582 (convert,
1583  "",
1584  rtx, (rtx op, tree from_type, tree to_type),
1585  default_addr_space_convert)
1586
1587 HOOK_VECTOR_END (addr_space)
1588
1589 #undef HOOK_PREFIX
1590 #define HOOK_PREFIX "TARGET_"
1591
1592 /* True if MODE is valid for the target.  By "valid", we mean able to
1593    be manipulated in non-trivial ways.  In particular, this means all
1594    the arithmetic is supported.  */
1595 DEFHOOK
1596 (scalar_mode_supported_p,
1597  "",
1598  bool, (enum machine_mode mode),
1599  default_scalar_mode_supported_p)
1600
1601 /* Similarly for vector modes.  "Supported" here is less strict.  At
1602    least some operations are supported; need to check optabs or builtins
1603    for further details.  */
1604 DEFHOOK
1605 (vector_mode_supported_p,
1606  "",
1607  bool, (enum machine_mode mode),
1608  hook_bool_mode_false)
1609
1610 /* True if we should try to use a scalar mode to represent an array,
1611    overriding the usual MAX_FIXED_MODE limit.  */
1612 DEFHOOK
1613 (array_mode_supported_p,
1614  "Return true if GCC should try to use a scalar mode to store an array\n\
1615 of @var{nelems} elements, given that each element has mode @var{mode}.\n\
1616 Returning true here overrides the usual @code{MAX_FIXED_MODE} limit\n\
1617 and allows GCC to use any defined integer mode.\n\
1618 \n\
1619 One use of this hook is to support vector load and store operations\n\
1620 that operate on several homogeneous vectors.  For example, ARM NEON\n\
1621 has operations like:\n\
1622 \n\
1623 @smallexample\n\
1624 int8x8x3_t vld3_s8 (const int8_t *)\n\
1625 @end smallexample\n\
1626 \n\
1627 where the return type is defined as:\n\
1628 \n\
1629 @smallexample\n\
1630 typedef struct int8x8x3_t\n\
1631 @{\n\
1632   int8x8_t val[3];\n\
1633 @} int8x8x3_t;\n\
1634 @end smallexample\n\
1635 \n\
1636 If this hook allows @code{val} to have a scalar mode, then\n\
1637 @code{int8x8x3_t} can have the same mode.  GCC can then store\n\
1638 @code{int8x8x3_t}s in registers rather than forcing them onto the stack.",
1639  bool, (enum machine_mode mode, unsigned HOST_WIDE_INT nelems),
1640  hook_bool_mode_uhwi_false)
1641
1642 /* Compute cost of moving data from a register of class FROM to one of
1643    TO, using MODE.  */
1644 DEFHOOK
1645 (register_move_cost,
1646  "",
1647  int, (enum machine_mode mode, reg_class_t from, reg_class_t to),
1648  default_register_move_cost)
1649
1650 /* Compute cost of moving registers to/from memory.  */
1651 /* ??? Documenting the argument types for this hook requires a GFDL
1652    license grant.  Also, the documentation uses a different name for RCLASS.  */
1653 DEFHOOK
1654 (memory_move_cost,
1655  "",
1656  int, (enum machine_mode mode, reg_class_t rclass, bool in),
1657  default_memory_move_cost)
1658
1659 /* True for MODE if the target expects that registers in this mode will
1660    be allocated to registers in a small register class.  The compiler is
1661    allowed to use registers explicitly used in the rtl as spill registers
1662    but it should prevent extending the lifetime of these registers.  */
1663 DEFHOOK
1664 (small_register_classes_for_mode_p,
1665  "",
1666  bool, (enum machine_mode mode),
1667  hook_bool_mode_false)
1668
1669 /* Register number for a flags register.  Only needs to be defined if the
1670    target is constrainted to use post-reload comparison elimination.  */
1671 DEFHOOKPOD
1672 (flags_regnum,
1673  "If the target has a dedicated flags register, and it needs to use the\
1674  post-reload comparison elimination pass, then this value should be set\
1675  appropriately.",
1676  unsigned int, INVALID_REGNUM)
1677
1678 /* Compute a (partial) cost for rtx X.  Return true if the complete
1679    cost has been computed, and false if subexpressions should be
1680    scanned.  In either case, *TOTAL contains the cost result.  */
1681 /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's
1682    not necessarily defined at this point.  */
1683 DEFHOOK
1684 (rtx_costs,
1685  "",
1686  bool, (rtx x, int code, int outer_code, int opno, int *total, bool speed),
1687  hook_bool_rtx_int_int_int_intp_bool_false)
1688
1689 /* Compute the cost of X, used as an address.  Never called with
1690    invalid addresses.  */
1691 DEFHOOK
1692 (address_cost,
1693  "",
1694  int, (rtx address, bool speed),
1695  default_address_cost)
1696
1697 /* Return where to allocate pseudo for a given hard register initial value.  */
1698 DEFHOOK
1699 (allocate_initial_value,
1700  "",
1701  rtx, (rtx hard_reg), NULL)
1702
1703 /* Return nonzero if evaluating UNSPEC[_VOLATILE] X might cause a trap.
1704    FLAGS has the same meaning as in rtlanal.c: may_trap_p_1.  */
1705 DEFHOOK
1706 (unspec_may_trap_p,
1707  "",
1708  int, (const_rtx x, unsigned flags),
1709  default_unspec_may_trap_p)
1710
1711 /* Given a register, this hook should return a parallel of registers
1712    to represent where to find the register pieces.  Define this hook
1713    if the register and its mode are represented in Dwarf in
1714    non-contiguous locations, or if the register should be
1715    represented in more than one register in Dwarf.  Otherwise, this
1716    hook should return NULL_RTX.  */
1717 DEFHOOK
1718 (dwarf_register_span,
1719  "",
1720  rtx, (rtx reg),
1721  hook_rtx_rtx_null)
1722
1723 /* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
1724    entries not corresponding directly to registers below
1725    FIRST_PSEUDO_REGISTER, this hook should generate the necessary
1726    code, given the address of the table.  */
1727 DEFHOOK
1728 (init_dwarf_reg_sizes_extra,
1729  "",
1730  void, (tree address),
1731  hook_void_tree)
1732
1733 /* Fetch the fixed register(s) which hold condition codes, for
1734    targets where it makes sense to look for duplicate assignments to
1735    the condition codes.  This should return true if there is such a
1736    register, false otherwise.  The arguments should be set to the
1737    fixed register numbers.  Up to two condition code registers are
1738    supported.  If there is only one for this target, the int pointed
1739    at by the second argument should be set to -1.  */
1740 DEFHOOK
1741 (fixed_condition_code_regs,
1742  "",
1743  bool, (unsigned int *p1, unsigned int *p2),
1744  hook_bool_uintp_uintp_false)
1745
1746 /* If two condition code modes are compatible, return a condition
1747      code mode which is compatible with both, such that a comparison
1748      done in the returned mode will work for both of the original
1749      modes.  If the condition code modes are not compatible, return
1750      VOIDmode.  */
1751 DEFHOOK
1752 (cc_modes_compatible,
1753  "",
1754  enum machine_mode, (enum machine_mode m1, enum machine_mode m2),
1755  default_cc_modes_compatible)
1756
1757 /* Do machine-dependent code transformations.  Called just before
1758      delayed-branch scheduling.  */
1759 DEFHOOK
1760 (machine_dependent_reorg,
1761  "",
1762  void, (void), NULL)
1763
1764 /* Create the __builtin_va_list type.  */
1765 DEFHOOK
1766 (build_builtin_va_list,
1767  "",
1768  tree, (void),
1769  std_build_builtin_va_list)
1770
1771 /* Enumerate the va list variants.  */
1772 DEFHOOK
1773 (enum_va_list_p,
1774  "",
1775  int, (int idx, const char **pname, tree *ptree),
1776  NULL)
1777
1778 /* Get the cfun/fndecl calling abi __builtin_va_list type.  */
1779 DEFHOOK
1780 (fn_abi_va_list,
1781  "",
1782  tree, (tree fndecl),
1783  std_fn_abi_va_list)
1784
1785 /* Get the __builtin_va_list type dependent on input type.  */
1786 DEFHOOK
1787 (canonical_va_list_type,
1788  "",
1789  tree, (tree type),
1790  std_canonical_va_list_type)
1791
1792 /* ??? Documenting this hook requires a GFDL license grant.  */
1793 DEFHOOK_UNDOC
1794 (expand_builtin_va_start,
1795 "Expand the @code{__builtin_va_start} builtin.",
1796  void, (tree valist, rtx nextarg), NULL)
1797
1798 /* Gimplifies a VA_ARG_EXPR.  */
1799 DEFHOOK
1800 (gimplify_va_arg_expr,
1801  "",
1802  tree, (tree valist, tree type, gimple_seq *pre_p, gimple_seq *post_p),
1803  std_gimplify_va_arg_expr)
1804
1805 /* Validity-checking routines for PCH files, target-specific.
1806    get_pch_validity returns a pointer to the data to be stored,
1807    and stores the size in its argument.  pch_valid_p gets the same
1808    information back and returns NULL if the PCH is valid,
1809    or an error message if not.  */
1810 DEFHOOK
1811 (get_pch_validity,
1812  "",
1813  void *, (size_t *sz),
1814  default_get_pch_validity)
1815
1816 DEFHOOK
1817 (pch_valid_p,
1818  "",
1819  const char *, (const void *data, size_t sz),
1820  default_pch_valid_p)
1821
1822 DEFHOOK
1823 (prepare_pch_save,
1824  "Called before writing out a PCH file.  If the target has some\n\
1825 garbage-collected data that needs to be in a particular state on PCH loads,\n\
1826 it can use this hook to enforce that state.  Very few targets need\n\
1827 to do anything here.",
1828  void, (void),
1829  hook_void_void)
1830
1831 /* If nonnull, this function checks whether a PCH file with the
1832    given set of target flags can be used.  It returns NULL if so,
1833    otherwise it returns an error message.  */
1834 DEFHOOK
1835 (check_pch_target_flags,
1836  "",
1837  const char *, (int pch_flags), NULL)
1838
1839 /* True if the compiler should give an enum type only as many
1840    bytes as it takes to represent the range of possible values of
1841    that type.  */
1842 DEFHOOK
1843 (default_short_enums,
1844  "",
1845  bool, (void),
1846  hook_bool_void_false)
1847
1848 /* This target hook returns an rtx that is used to store the address
1849    of the current frame into the built-in setjmp buffer.  */
1850 DEFHOOK
1851 (builtin_setjmp_frame_value,
1852  "",
1853  rtx, (void),
1854  default_builtin_setjmp_frame_value)
1855
1856 /* This target hook should add STRING_CST trees for any hard regs
1857    the port wishes to automatically clobber for an asm.  */
1858 DEFHOOK
1859 (md_asm_clobbers,
1860  "",
1861  tree, (tree outputs, tree inputs, tree clobbers),
1862  hook_tree_tree_tree_tree_3rd_identity)
1863
1864 /* This target hook allows the backend to specify a calling convention
1865    in the debug information.  This function actually returns an
1866    enum dwarf_calling_convention, but because of forward declarations
1867    and not wanting to include dwarf2.h everywhere target.h is included
1868    the function is being declared as an int.  */
1869 DEFHOOK
1870 (dwarf_calling_convention,
1871  "",
1872  int, (const_tree function),
1873  hook_int_const_tree_0)
1874
1875 /* This target hook allows the backend to emit frame-related insns that
1876    contain UNSPECs or UNSPEC_VOLATILEs.  The call frame debugging info
1877    engine will invoke it on insns of the form
1878      (set (reg) (unspec [...] UNSPEC_INDEX))
1879    and
1880      (set (reg) (unspec_volatile [...] UNSPECV_INDEX))
1881    to let the backend emit the call frame instructions.  */
1882 DEFHOOK
1883 (dwarf_handle_frame_unspec,
1884  "",
1885  void, (const char *label, rtx pattern, int index), NULL)
1886
1887 /* ??? Documenting this hook requires a GFDL license grant.  */
1888 DEFHOOK_UNDOC
1889 (stdarg_optimize_hook,
1890 "Perform architecture specific checking of statements gimplified\
1891  from @code{VA_ARG_EXPR}.  @var{stmt} is the statement.  Returns true if\
1892  the statement doesn't need to be checked for @code{va_list} references.",
1893  bool, (struct stdarg_info *ai, const_gimple stmt), NULL)
1894
1895 /* This target hook allows the operating system to override the DECL
1896    that represents the external variable that contains the stack
1897    protection guard variable.  The type of this DECL is ptr_type_node.  */
1898 DEFHOOK
1899 (stack_protect_guard,
1900  "",
1901  tree, (void),
1902  default_stack_protect_guard)
1903
1904 /* This target hook allows the operating system to override the CALL_EXPR
1905    that is invoked when a check vs the guard variable fails.  */
1906 DEFHOOK
1907 (stack_protect_fail,
1908  "",
1909  tree, (void),
1910  default_external_stack_protect_fail)
1911
1912 /* Returns NULL if target supports the insn within a doloop block,
1913    otherwise it returns an error message.  */
1914 DEFHOOK
1915 (invalid_within_doloop,
1916  "",
1917  const char *, (const_rtx insn),
1918  default_invalid_within_doloop)
1919
1920 DEFHOOK
1921 (valid_dllimport_attribute_p,
1922 "@var{decl} is a variable or function with @code{__attribute__((dllimport))}\
1923  specified.  Use this hook if the target needs to add extra validation\
1924  checks to @code{handle_dll_attribute}.",
1925  bool, (const_tree decl),
1926  hook_bool_const_tree_true)
1927
1928 /* If non-zero, align constant anchors in CSE to a multiple of this
1929    value.  */
1930 DEFHOOKPOD
1931 (const_anchor,
1932  "",
1933  unsigned HOST_WIDE_INT, 0)
1934
1935 /* Functions relating to calls - argument passing, returns, etc.  */
1936 /* Members of struct call have no special macro prefix.  */
1937 HOOK_VECTOR (TARGET_CALLS, calls)
1938
1939 DEFHOOK
1940 (promote_function_mode,
1941  "",
1942  enum machine_mode, (const_tree type, enum machine_mode mode, int *punsignedp,
1943                      const_tree funtype, int for_return),
1944  default_promote_function_mode)
1945
1946 DEFHOOK
1947 (promote_prototypes,
1948  "",
1949  bool, (const_tree fntype),
1950  hook_bool_const_tree_false)
1951
1952 DEFHOOK
1953 (struct_value_rtx,
1954  "",
1955  rtx, (tree fndecl, int incoming),
1956  hook_rtx_tree_int_null)
1957 DEFHOOK
1958 (return_in_memory,
1959  "",
1960  bool, (const_tree type, const_tree fntype),
1961  default_return_in_memory)
1962
1963 DEFHOOK
1964 (return_in_msb,
1965  "",
1966  bool, (const_tree type),
1967  hook_bool_const_tree_false)
1968
1969 /* Return true if a parameter must be passed by reference.  TYPE may
1970    be null if this is a libcall.  CA may be null if this query is
1971    from __builtin_va_arg.  */
1972 DEFHOOK
1973 (pass_by_reference,
1974  "",
1975  bool,
1976  (cumulative_args_t cum, enum machine_mode mode, const_tree type, bool named),
1977  hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
1978
1979 DEFHOOK
1980 (expand_builtin_saveregs,
1981  "",
1982  rtx, (void),
1983  default_expand_builtin_saveregs)
1984
1985 /* Returns pretend_argument_size.  */
1986 DEFHOOK
1987 (setup_incoming_varargs,
1988  "",
1989  void, (cumulative_args_t args_so_far, enum machine_mode mode, tree type,
1990         int *pretend_args_size, int second_time),
1991  default_setup_incoming_varargs)
1992
1993 DEFHOOK
1994 (strict_argument_naming,
1995  "",
1996  bool, (cumulative_args_t ca),
1997  hook_bool_CUMULATIVE_ARGS_false)
1998
1999 /* Returns true if we should use
2000    targetm.calls.setup_incoming_varargs() and/or
2001    targetm.calls.strict_argument_naming().  */
2002 DEFHOOK
2003 (pretend_outgoing_varargs_named,
2004  "",
2005  bool, (cumulative_args_t ca),
2006  default_pretend_outgoing_varargs_named)
2007
2008 /* Given a complex type T, return true if a parameter of type T
2009    should be passed as two scalars.  */
2010 DEFHOOK
2011 (split_complex_arg,
2012  "",
2013  bool, (const_tree type), NULL)
2014
2015 /* Return true if type T, mode MODE, may not be passed in registers,
2016    but must be passed on the stack.  */
2017 /* ??? This predicate should be applied strictly after pass-by-reference.
2018    Need audit to verify that this is the case.  */
2019 DEFHOOK
2020 (must_pass_in_stack,
2021  "",
2022  bool, (enum machine_mode mode, const_tree type),
2023  must_pass_in_stack_var_size_or_pad)
2024
2025 /* Return true if type TYPE, mode MODE, which is passed by reference,
2026    should have the object copy generated by the callee rather than
2027    the caller.  It is never called for TYPE requiring constructors.  */
2028 DEFHOOK
2029 (callee_copies,
2030  "",
2031  bool,
2032  (cumulative_args_t cum, enum machine_mode mode, const_tree type, bool named),
2033  hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
2034
2035 /* Return zero for arguments passed entirely on the stack or entirely
2036    in registers.  If passed in both, return the number of bytes passed
2037    in registers; the balance is therefore passed on the stack.  */
2038 DEFHOOK
2039 (arg_partial_bytes,
2040  "",
2041  int, (cumulative_args_t cum, enum machine_mode mode, tree type, bool named),
2042  hook_int_CUMULATIVE_ARGS_mode_tree_bool_0)
2043
2044 /* Update the state in CA to advance past an argument in the
2045    argument list.  The values MODE, TYPE, and NAMED describe that
2046    argument.  */
2047 DEFHOOK
2048 (function_arg_advance,
2049  "",
2050  void,
2051  (cumulative_args_t ca, enum machine_mode mode, const_tree type, bool named),
2052  default_function_arg_advance)
2053
2054 /* Return zero if the argument described by the state of CA should
2055    be placed on a stack, or a hard register in which to store the
2056    argument.  The values MODE, TYPE, and NAMED describe that
2057    argument.  */
2058 DEFHOOK
2059 (function_arg,
2060  "",
2061  rtx, (cumulative_args_t ca, enum machine_mode mode, const_tree type,
2062        bool named),
2063  default_function_arg)
2064
2065 /* Likewise, but for machines with register windows.  Return the
2066    location where the argument will appear to the callee.  */
2067 DEFHOOK
2068 (function_incoming_arg,
2069  "",
2070  rtx, (cumulative_args_t ca, enum machine_mode mode, const_tree type,
2071        bool named),
2072  default_function_incoming_arg)
2073
2074 DEFHOOK
2075 (function_arg_boundary,
2076  "",
2077  unsigned int, (enum machine_mode mode, const_tree type),
2078  default_function_arg_boundary)
2079
2080 DEFHOOK
2081 (function_arg_round_boundary,
2082  "Normally, the size of an argument is rounded up to @code{PARM_BOUNDARY},\n\
2083 which is the default value for this hook.  You can define this hook to\n\
2084 return a different value if an argument size must be rounded to a larger\n\
2085 value.",
2086  unsigned int, (enum machine_mode mode, const_tree type),
2087  default_function_arg_round_boundary)
2088
2089 /* Return the diagnostic message string if function without a prototype
2090    is not allowed for this 'val' argument; NULL otherwise. */
2091 DEFHOOK
2092 (invalid_arg_for_unprototyped_fn,
2093  "",
2094  const char *, (const_tree typelist, const_tree funcdecl, const_tree val),
2095  hook_invalid_arg_for_unprototyped_fn)
2096
2097 /* Return an rtx for the return value location of the function
2098    specified by FN_DECL_OR_TYPE with a return type of RET_TYPE.  */
2099 DEFHOOK
2100 (function_value,
2101  "",
2102  rtx, (const_tree ret_type, const_tree fn_decl_or_type, bool outgoing),
2103  default_function_value)
2104
2105 /* Return the rtx for the result of a libcall of mode MODE,
2106    calling the function FN_NAME.  */
2107 DEFHOOK
2108 (libcall_value,
2109  "",
2110  rtx, (enum machine_mode mode, const_rtx fun),
2111  default_libcall_value)
2112
2113 /* Return true if REGNO is a possible register number for
2114    a function value as seen by the caller.  */
2115 DEFHOOK
2116 (function_value_regno_p,
2117  "",
2118  bool, (const unsigned int regno),
2119  default_function_value_regno_p)
2120
2121 /* ??? Documenting this hook requires a GFDL license grant.  */
2122 DEFHOOK_UNDOC
2123 (internal_arg_pointer,
2124 "Return an rtx for the argument pointer incoming to the\
2125  current function.",
2126  rtx, (void),
2127  default_internal_arg_pointer)
2128
2129 /* Update the current function stack boundary if needed.  */
2130 DEFHOOK
2131 (update_stack_boundary,
2132  "",
2133  void, (void), NULL)
2134
2135 /* Handle stack alignment and return an rtx for Dynamic Realign
2136    Argument Pointer if necessary.  */
2137 DEFHOOK
2138 (get_drap_rtx,
2139  "",
2140  rtx, (void), NULL)
2141
2142 /* Return true if all function parameters should be spilled to the
2143    stack.  */
2144 DEFHOOK
2145 (allocate_stack_slots_for_args,
2146  "",
2147  bool, (void),
2148  hook_bool_void_true)
2149
2150 /* Return an rtx for the static chain for FNDECL.  If INCOMING_P is true,
2151        then it should be for the callee; otherwise for the caller.  */
2152 DEFHOOK
2153 (static_chain,
2154  "",
2155  rtx, (const_tree fndecl, bool incoming_p),
2156  default_static_chain)
2157
2158 /* Fill in the trampoline at MEM with a call to FNDECL and a
2159    static chain value of CHAIN.  */
2160 DEFHOOK
2161 (trampoline_init,
2162  "",
2163  void, (rtx m_tramp, tree fndecl, rtx static_chain),
2164  default_trampoline_init)
2165
2166 /* Adjust the address of the trampoline in a target-specific way.  */
2167 DEFHOOK
2168 (trampoline_adjust_address,
2169  "",
2170  rtx, (rtx addr), NULL)
2171
2172 /* Return the number of bytes of its own arguments that a function
2173    pops on returning, or 0 if the function pops no arguments and the
2174    caller must therefore pop them all after the function returns.  */
2175 /* ??? tm.texi has no types for the parameters.  */
2176 DEFHOOK
2177 (return_pops_args,
2178  "",
2179  int, (tree fundecl, tree funtype, int size),
2180  default_return_pops_args)
2181
2182 /* Return a mode wide enough to copy any function value that might be
2183    returned.  */
2184 DEFHOOK
2185 (get_raw_result_mode,
2186  "This target hook returns the mode to be used when accessing raw return\
2187  registers in @code{__builtin_return}.  Define this macro if the value\
2188  in @var{reg_raw_mode} is not correct.",
2189  enum machine_mode, (int regno),
2190  default_get_reg_raw_mode)
2191
2192 /* Return a mode wide enough to copy any argument value that might be
2193    passed.  */
2194 DEFHOOK
2195 (get_raw_arg_mode,
2196  "This target hook returns the mode to be used when accessing raw argument\
2197  registers in @code{__builtin_apply_args}.  Define this macro if the value\
2198  in @var{reg_raw_mode} is not correct.",
2199  enum machine_mode, (int regno),
2200  default_get_reg_raw_mode)
2201
2202 HOOK_VECTOR_END (calls)
2203
2204 /* Return the diagnostic message string if conversion from FROMTYPE
2205    to TOTYPE is not allowed, NULL otherwise.  */
2206 DEFHOOK
2207 (invalid_conversion,
2208  "",
2209  const char *, (const_tree fromtype, const_tree totype),
2210  hook_constcharptr_const_tree_const_tree_null)
2211
2212 /* Return the diagnostic message string if the unary operation OP is
2213    not permitted on TYPE, NULL otherwise.  */
2214 DEFHOOK
2215 (invalid_unary_op,
2216  "",
2217  const char *, (int op, const_tree type),
2218  hook_constcharptr_int_const_tree_null)
2219
2220 /* Return the diagnostic message string if the binary operation OP
2221    is not permitted on TYPE1 and TYPE2, NULL otherwise.  */
2222 DEFHOOK
2223 (invalid_binary_op,
2224  "",
2225  const char *, (int op, const_tree type1, const_tree type2),
2226  hook_constcharptr_int_const_tree_const_tree_null)
2227
2228 /* Return the diagnostic message string if TYPE is not valid as a
2229    function parameter type, NULL otherwise.  */
2230 DEFHOOK
2231 (invalid_parameter_type,
2232  "",
2233  const char *, (const_tree type),
2234  hook_constcharptr_const_tree_null)
2235
2236 /* Return the diagnostic message string if TYPE is not valid as a
2237    function return type, NULL otherwise.  */
2238 DEFHOOK
2239 (invalid_return_type,
2240  "",
2241  const char *, (const_tree type),
2242  hook_constcharptr_const_tree_null)
2243
2244 /* If values of TYPE are promoted to some other type when used in
2245    expressions (analogous to the integer promotions), return that type,
2246    or NULL_TREE otherwise.  */
2247 DEFHOOK
2248 (promoted_type,
2249  "",
2250  tree, (const_tree type),
2251  hook_tree_const_tree_null)
2252
2253 /* Convert EXPR to TYPE, if target-specific types with special conversion
2254    rules are involved.  Return the converted expression, or NULL to apply
2255    the standard conversion rules.  */
2256 DEFHOOK
2257 (convert_to_type,
2258  "",
2259  tree, (tree type, tree expr),
2260  hook_tree_tree_tree_null)
2261
2262 /* Return the class for a secondary reload, and fill in extra information.  */
2263 DEFHOOK
2264 (secondary_reload,
2265  "",
2266  reg_class_t,
2267  (bool in_p, rtx x, reg_class_t reload_class, enum machine_mode reload_mode,
2268   secondary_reload_info *sri),
2269  default_secondary_reload)
2270
2271 /* Given an rtx X being reloaded into a reg required to be in class CLASS,
2272    return the class of reg to actually use.  */
2273 DEFHOOK
2274 (preferred_reload_class,
2275  "",
2276  reg_class_t,
2277  (rtx x, reg_class_t rclass),
2278  default_preferred_reload_class)
2279
2280 /* Like TARGET_PREFERRED_RELOAD_CLASS, but for output reloads instead of
2281    input reloads.  */
2282 DEFHOOK
2283 (preferred_output_reload_class,
2284  "",
2285  reg_class_t,
2286  (rtx x, reg_class_t rclass),
2287  default_preferred_output_reload_class)
2288
2289 DEFHOOK
2290 (class_likely_spilled_p,
2291  "",
2292  bool, (reg_class_t rclass),
2293  default_class_likely_spilled_p)
2294
2295 /* Return the maximum number of consecutive registers
2296    needed to represent mode MODE in a register of class RCLASS.  */
2297 DEFHOOK
2298 (class_max_nregs,
2299  "",
2300  unsigned char, (reg_class_t rclass, enum machine_mode mode),
2301  default_class_max_nregs)
2302
2303 DEFHOOK
2304 (preferred_rename_class,
2305  "A target hook that places additional preference on the register\
2306  class to use when it is necessary to rename a register in class\
2307  @var{rclass} to another class, or perhaps @var{NO_REGS}, if no\
2308  preferred register class is found or hook @code{preferred_rename_class}\
2309  is not implemented.\
2310  Sometimes returning a more restrictive class makes better code.  For\
2311  example, on ARM, thumb-2 instructions using @code{LO_REGS} may be\
2312  smaller than instructions using @code{GENERIC_REGS}.  By returning\
2313  @code{LO_REGS} from @code{preferred_rename_class}, code size can\
2314  be reduced.",
2315  reg_class_t, (reg_class_t rclass),
2316  default_preferred_rename_class)
2317
2318 /* This target hook allows the backend to perform additional
2319    processing while initializing for variable expansion.  */
2320 DEFHOOK
2321 (expand_to_rtl_hook,
2322  "",
2323  void, (void),
2324  hook_void_void)
2325
2326 /* This target hook allows the backend to perform additional
2327    instantiations on rtx that are not actually in insns yet,
2328    but will be later.  */
2329 DEFHOOK
2330 (instantiate_decls,
2331  "",
2332  void, (void),
2333  hook_void_void)
2334
2335 /* Return true if is OK to use a hard register REGNO as scratch register
2336    in peephole2.  */
2337 DEFHOOK
2338 (hard_regno_scratch_ok,
2339  "",
2340  bool, (unsigned int regno),
2341  default_hard_regno_scratch_ok)
2342
2343 /* Return the smallest number of different values for which it is best to
2344    use a jump-table instead of a tree of conditional branches.  */
2345 DEFHOOK
2346 (case_values_threshold,
2347  "",
2348  unsigned int, (void),
2349  default_case_values_threshold)
2350
2351 /* Retutn true if a function must have and use a frame pointer.  */
2352 DEFHOOK
2353 (frame_pointer_required,
2354  "",
2355  bool, (void),
2356  hook_bool_void_false)
2357
2358 /* Returns true if the compiler is allowed to try to replace register number
2359    from-reg with register number to-reg.  */
2360 DEFHOOK
2361 (can_eliminate,
2362  "",
2363  bool, (const int from_reg, const int to_reg),
2364  hook_bool_const_int_const_int_true)
2365
2366 /* Modify any or all of fixed_regs, call_used_regs, global_regs,
2367    reg_names, and reg_class_contents to account of the vagaries of the
2368    target.  */
2369 DEFHOOK
2370 (conditional_register_usage,
2371  "",
2372  void, (void),
2373  hook_void_void)
2374
2375 /* Functions specific to the C family of frontends.  */
2376 #undef HOOK_PREFIX
2377 #define HOOK_PREFIX "TARGET_C_"
2378 HOOK_VECTOR (TARGET_C, c)
2379
2380 /* ??? Documenting this hook requires a GFDL license grant.  */
2381 DEFHOOK_UNDOC
2382 (mode_for_suffix,
2383 "Return machine mode for non-standard constant literal suffix @var{c},\
2384  or VOIDmode if non-standard suffixes are unsupported.",
2385  enum machine_mode, (char c),
2386  default_mode_for_suffix)
2387
2388 HOOK_VECTOR_END (c)
2389
2390 /* Functions specific to the C++ frontend.  */
2391 #undef HOOK_PREFIX
2392 #define HOOK_PREFIX "TARGET_CXX_"
2393 HOOK_VECTOR (TARGET_CXX, cxx)
2394
2395 /* Return the integer type used for guard variables.  */
2396 DEFHOOK
2397 (guard_type,
2398  "",
2399  tree, (void),
2400  default_cxx_guard_type)
2401
2402 /* Return true if only the low bit of the guard should be tested.  */
2403 DEFHOOK
2404 (guard_mask_bit,
2405  "",
2406  bool, (void),
2407  hook_bool_void_false)
2408
2409 /* Returns the size of the array cookie for an array of type.  */
2410 DEFHOOK
2411 (get_cookie_size,
2412  "",
2413  tree, (tree type),
2414  default_cxx_get_cookie_size)
2415
2416 /* Returns true if the element size should be stored in the array cookie.  */
2417 DEFHOOK
2418 (cookie_has_size,
2419  "",
2420  bool, (void),
2421  hook_bool_void_false)
2422
2423 /* Allows backends to perform additional processing when
2424    deciding if a class should be exported or imported.  */
2425 DEFHOOK
2426 (import_export_class,
2427  "",
2428  int, (tree type, int import_export), NULL)
2429
2430 /* Returns true if constructors and destructors return "this".  */
2431 DEFHOOK
2432 (cdtor_returns_this,
2433  "",
2434  bool, (void),
2435  hook_bool_void_false)
2436
2437 /* Returns true if the key method for a class can be an inline
2438    function, so long as it is not declared inline in the class
2439    itself.  Returning true is the behavior required by the Itanium C++ ABI.  */
2440 DEFHOOK
2441 (key_method_may_be_inline,
2442  "",
2443  bool, (void),
2444  hook_bool_void_true)
2445
2446 DEFHOOK
2447 (determine_class_data_visibility,
2448 "@var{decl} is a virtual table, virtual table table, typeinfo object,\
2449  or other similar implicit class data object that will be emitted with\
2450  external linkage in this translation unit.  No ELF visibility has been\
2451  explicitly specified.  If the target needs to specify a visibility\
2452  other than that of the containing class, use this hook to set\
2453  @code{DECL_VISIBILITY} and @code{DECL_VISIBILITY_SPECIFIED}.",
2454  void, (tree decl),
2455  hook_void_tree)
2456
2457 /* Returns true (the default) if virtual tables and other
2458    similar implicit class data objects are always COMDAT if they
2459    have external linkage.  If this hook returns false, then
2460    class data for classes whose virtual table will be emitted in
2461    only one translation unit will not be COMDAT.  */
2462 DEFHOOK
2463 (class_data_always_comdat,
2464  "",
2465  bool, (void),
2466  hook_bool_void_true)
2467
2468 /* Returns true (the default) if the RTTI for the basic types,
2469    which is always defined in the C++ runtime, should be COMDAT;
2470    false if it should not be COMDAT.  */
2471 DEFHOOK
2472 (library_rtti_comdat,
2473  "",
2474  bool, (void),
2475  hook_bool_void_true)
2476
2477 /* Returns true if __aeabi_atexit should be used to register static
2478    destructors.  */
2479 DEFHOOK
2480 (use_aeabi_atexit,
2481  "",
2482  bool, (void),
2483  hook_bool_void_false)
2484
2485 /* Returns true if target may use atexit in the same manner as
2486    __cxa_atexit  to register static destructors.  */
2487 DEFHOOK
2488 (use_atexit_for_cxa_atexit,
2489  "",
2490  bool, (void),
2491  hook_bool_void_false)
2492
2493 DEFHOOK
2494 (adjust_class_at_definition,
2495 "@var{type} is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that has just\
2496  been defined.  Use this hook to make adjustments to the class (eg, tweak\
2497  visibility or perform any other required target modifications).",
2498  void, (tree type),
2499  hook_void_tree)
2500
2501 DEFHOOK
2502 (decl_mangling_context,
2503  "Return target-specific mangling context of @var{decl} or @code{NULL_TREE}.",
2504  tree, (const_tree decl),
2505  hook_tree_const_tree_null)
2506
2507 HOOK_VECTOR_END (cxx)
2508
2509 /* Functions and data for emulated TLS support.  */
2510 #undef HOOK_PREFIX
2511 #define HOOK_PREFIX "TARGET_EMUTLS_"
2512 HOOK_VECTOR (TARGET_EMUTLS, emutls)
2513
2514 /* Name of the address and common functions.  */
2515 DEFHOOKPOD
2516 (get_address,
2517  "",
2518  const char *, "__builtin___emutls_get_address")
2519
2520 DEFHOOKPOD
2521 (register_common,
2522  "",
2523  const char *, "__builtin___emutls_register_common")
2524
2525 /* Prefixes for proxy variable and template.  */
2526 DEFHOOKPOD
2527 (var_section,
2528  "",
2529  const char *, NULL)
2530
2531 DEFHOOKPOD
2532 (tmpl_section,
2533  "",
2534  const char *, NULL)
2535
2536 /* Prefixes for proxy variable and template.  */
2537 DEFHOOKPOD
2538 (var_prefix,
2539  "",
2540  const char *, NULL)
2541
2542 DEFHOOKPOD
2543 (tmpl_prefix,
2544  "",
2545  const char *, NULL)
2546
2547 /* Function to generate field definitions of the proxy variable.  */
2548 DEFHOOK
2549 (var_fields,
2550  "",
2551  tree, (tree type, tree *name),
2552  default_emutls_var_fields)
2553
2554 /* Function to initialize a proxy variable.  */
2555 DEFHOOK
2556 (var_init,
2557  "",
2558  tree, (tree var, tree decl, tree tmpl_addr),
2559  default_emutls_var_init)
2560
2561 /* Whether we are allowed to alter the usual alignment of the
2562    proxy variable.  */
2563 DEFHOOKPOD
2564 (var_align_fixed,
2565  "",
2566  bool, false)
2567
2568 /* Whether we can emit debug information for TLS vars.  */
2569 DEFHOOKPOD
2570 (debug_form_tls_address,
2571  "",
2572  bool, false)
2573
2574 HOOK_VECTOR_END (emutls)
2575
2576 #undef HOOK_PREFIX
2577 #define HOOK_PREFIX "TARGET_OPTION_"
2578 HOOK_VECTOR (TARGET_OPTION_HOOKS, target_option_hooks)
2579
2580 /* Function to validate the attribute((option(...))) strings or NULL.  If
2581    the option is validated, it is assumed that DECL_FUNCTION_SPECIFIC will
2582    be filled in in the function decl node.  */
2583 DEFHOOK
2584 (valid_attribute_p,
2585  "",
2586  bool, (tree fndecl, tree name, tree args, int flags),
2587  default_target_option_valid_attribute_p)
2588
2589 /* Function to save any extra target state in the target options structure.  */
2590 DEFHOOK
2591 (save,
2592  "",
2593  void, (struct cl_target_option *ptr), NULL)
2594
2595 /* Function to restore any extra target state from the target options
2596    structure.  */
2597 DEFHOOK
2598 (restore,
2599  "",
2600  void, (struct cl_target_option *ptr), NULL)
2601
2602 /* Function to print any extra target state from the target options
2603    structure.  */
2604 DEFHOOK
2605 (print,
2606  "",
2607  void, (FILE *file, int indent, struct cl_target_option *ptr), NULL)
2608
2609 /* Function to parse arguments to be validated for #pragma option, and to
2610    change the state if the options are valid.  If the first argument is
2611    NULL, the second argument specifies the default options to use.  Return
2612    true if the options are valid, and set the current state.  */
2613 /* ??? The documentation in tm.texi is incomplete.  */
2614 DEFHOOK
2615 (pragma_parse,
2616  "",
2617  bool, (tree args, tree pop_target),
2618  default_target_option_pragma_parse)
2619
2620 /* Do option overrides for the target.  */
2621 DEFHOOK
2622 (override,
2623  "",
2624  void, (void),
2625  hook_void_void)
2626
2627 /* Function to determine if one function can inline another function.  */
2628 #undef HOOK_PREFIX
2629 #define HOOK_PREFIX "TARGET_"
2630 DEFHOOK
2631 (can_inline_p,
2632  "",
2633  bool, (tree caller, tree callee),
2634  default_target_can_inline_p)
2635
2636 HOOK_VECTOR_END (target_option)
2637
2638 /* For targets that need to mark extra registers as live on entry to
2639    the function, they should define this target hook and set their
2640    bits in the bitmap passed in. */
2641 DEFHOOK
2642 (extra_live_on_entry,
2643  "",
2644  void, (bitmap regs),
2645  hook_void_bitmap)
2646
2647 /* Determine the type of unwind info to emit for debugging.  */
2648 DEFHOOK
2649 (debug_unwind_info,
2650  "",
2651  enum unwind_info_type, (void),
2652  default_debug_unwind_info)
2653
2654 /* Leave the boolean fields at the end.  */
2655
2656 /* True if we can create zeroed data by switching to a BSS section
2657    and then using ASM_OUTPUT_SKIP to allocate the space.  */
2658 DEFHOOKPOD
2659 (have_switchable_bss_sections,
2660  "",
2661  bool, false)
2662
2663 /* True if "native" constructors and destructors are supported,
2664    false if we're using collect2 for the job.  */
2665 DEFHOOKPOD
2666 (have_ctors_dtors,
2667  "",
2668  bool, false)
2669
2670 /* True if thread-local storage is supported.  */
2671 DEFHOOKPOD
2672 (have_tls,
2673  "",
2674  bool, false)
2675
2676 /* True if a small readonly data section is supported.  */
2677 DEFHOOKPOD
2678 (have_srodata_section,
2679  "",
2680  bool, false)
2681
2682 /* True if EH frame info sections should be zero-terminated.  */
2683 DEFHOOKPOD
2684 (terminate_dw2_eh_frame_info,
2685  "",
2686  bool, true)
2687
2688 /* True if #NO_APP should be emitted at the beginning of assembly output.  */
2689 DEFHOOKPOD
2690 (asm_file_start_app_off,
2691  "",
2692  bool, false)
2693
2694 /* True if output_file_directive should be called for main_input_filename
2695    at the beginning of assembly output.  */
2696 DEFHOOKPOD
2697 (asm_file_start_file_directive,
2698  "",
2699  bool, false)
2700
2701 DEFHOOKPOD
2702 (handle_pragma_extern_prefix,
2703 "True if @code{#pragma extern_prefix} is to be supported.",
2704  bool, 0)
2705
2706 /* True if the target is allowed to reorder memory accesses unless
2707    synchronization is explicitly requested.  */
2708 DEFHOOKPOD
2709 (relaxed_ordering,
2710  "",
2711  bool, false)
2712
2713 /* Returns true if we should generate exception tables for use with the
2714    ARM EABI.  The effects the encoding of function exception specifications.  */
2715 DEFHOOKPOD
2716 (arm_eabi_unwinder,
2717  "",
2718  bool, false)
2719
2720 DEFHOOKPOD
2721 (want_debug_pub_sections,
2722  "True if the @code{.debug_pubtypes} and @code{.debug_pubnames} sections\
2723  should be emitted.  These sections are not used on most platforms, and\
2724  in particular GDB does not use them.",
2725  bool, false)
2726
2727 DEFHOOKPOD
2728 (delay_sched2, "True if sched2 is not to be run at its normal place.  \
2729 This usually means it will be run as part of machine-specific reorg.",
2730 bool, false)
2731
2732 DEFHOOKPOD
2733 (delay_vartrack, "True if vartrack is not to be run at its normal place.  \
2734 This usually means it will be run as part of machine-specific reorg.",
2735 bool, false)
2736
2737 /* Leave the boolean fields at the end.  */
2738
2739 /* Close the 'struct gcc_target' definition.  */
2740 HOOK_VECTOR_END (C90_EMPTY_HACK)