gcc/targhooks.c

   1 /* Default target hook functions.
   2    Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* The migration of target macros to target hooks works as follows:
  22
  23    1. Create a target hook that uses the existing target macros to
  24       implement the same functionality.
  25
  26    2. Convert all the MI files to use the hook instead of the macro.
  27
  28    3. Repeat for a majority of the remaining target macros.  This will
  29       take some time.
  30
  31    4. Tell target maintainers to start migrating.
  32
  33    5. Eventually convert the backends to override the hook instead of
  34       defining the macros.  This will take some time too.
  35
  36    6. TBD when, poison the macros.  Unmigrated targets will break at
  37       this point.
  38
  39    Note that we expect steps 1-3 to be done by the people that
  40    understand what the MI does with each macro, and step 5 to be done
  41    by the target maintainers for their respective targets.
  42
  43    Note that steps 1 and 2 don't have to be done together, but no
  44    target can override the new hook until step 2 is complete for it.
  45
  46    Once the macros are poisoned, we will revert to the old migration
  47    rules - migrate the macro, callers, and targets all at once.  This
  48    comment can thus be removed at that point.  */
  49
  50 #include "config.h"
  51 #include "system.h"
  52 #include "coretypes.h"
  53 #include "tm.h"
  54 #include "machmode.h"
  55 #include "rtl.h"
  56 #include "tree.h"
  57 #include "expr.h"
  58 #include "output.h"
  59 #include "diagnostic-core.h"
  60 #include "function.h"
  61 #include "target.h"
  62 #include "tm_p.h"
  63 #include "target-def.h"
  64 #include "ggc.h"
  65 #include "hard-reg-set.h"
  66 #include "regs.h"
  67 #include "reload.h"
  68 #include "optabs.h"
  69 #include "recog.h"
  70 #include "intl.h"
  71 #include "opts.h"
  72 #include "tree-flow.h"
  73 #include "tree-ssa-alias.h"
  74
  75
  76 bool
  77 default_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED,
  78                               rtx addr ATTRIBUTE_UNUSED,
  79                               bool strict ATTRIBUTE_UNUSED)
  80 {
  81 #ifdef GO_IF_LEGITIMATE_ADDRESS
  82   /* Defer to the old implementation using a goto.  */
  83   if (strict)
  84     return strict_memory_address_p (mode, addr);
  85   else
  86     return memory_address_p (mode, addr);
  87 #else
  88   gcc_unreachable ();
  89 #endif
  90 }
  91
  92 void
  93 default_external_libcall (rtx fun ATTRIBUTE_UNUSED)
  94 {
  95 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
  96   ASM_OUTPUT_EXTERNAL_LIBCALL(asm_out_file, fun);
  97 #endif
  98 }
  99
 100 int
 101 default_unspec_may_trap_p (const_rtx x, unsigned flags)
 102 {
 103   int i;
 104
 105   if (GET_CODE (x) == UNSPEC_VOLATILE
 106       /* Any floating arithmetic may trap.  */
 107       || (SCALAR_FLOAT_MODE_P (GET_MODE (x))
 108           && flag_trapping_math))
 109     return 1;
 110
 111   for (i = 0; i < XVECLEN (x, 0); ++i)
 112     {
 113       if (may_trap_p_1 (XVECEXP (x, 0, i), flags))
 114         return 1;
 115     }
 116
 117   return 0;
 118 }
 119
 120 enum machine_mode
 121 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED,
 122                                enum machine_mode mode,
 123                                int *punsignedp ATTRIBUTE_UNUSED,
 124                                const_tree funtype ATTRIBUTE_UNUSED,
 125                                int for_return ATTRIBUTE_UNUSED)
 126 {
 127   if (type != NULL_TREE && for_return == 2)
 128     return promote_mode (type, mode, punsignedp);
 129   return mode;
 130 }
 131
 132 enum machine_mode
 133 default_promote_function_mode_always_promote (const_tree type,
 134                                               enum machine_mode mode,
 135                                               int *punsignedp,
 136                                               const_tree funtype ATTRIBUTE_UNUSED,
 137                                               int for_return ATTRIBUTE_UNUSED)
 138 {
 139   return promote_mode (type, mode, punsignedp);
 140 }
 141
 142
 143 enum machine_mode
 144 default_cc_modes_compatible (enum machine_mode m1, enum machine_mode m2)
 145 {
 146   if (m1 == m2)
 147     return m1;
 148   return VOIDmode;
 149 }
 150
 151 bool
 152 default_return_in_memory (const_tree type,
 153                           const_tree fntype ATTRIBUTE_UNUSED)
 154 {
 155   return (TYPE_MODE (type) == BLKmode);
 156 }
 157
 158 rtx
 159 default_legitimize_address (rtx x, rtx orig_x ATTRIBUTE_UNUSED,
 160                             enum machine_mode mode ATTRIBUTE_UNUSED)
 161 {
 162   return x;
 163 }
 164
 165 rtx
 166 default_expand_builtin_saveregs (void)
 167 {
 168   error ("__builtin_saveregs not supported by this target");
 169   return const0_rtx;
 170 }
 171
 172 void
 173 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED,
 174                                 enum machine_mode mode ATTRIBUTE_UNUSED,
 175                                 tree type ATTRIBUTE_UNUSED,
 176                                 int *pretend_arg_size ATTRIBUTE_UNUSED,
 177                                 int second_time ATTRIBUTE_UNUSED)
 178 {
 179 }
 180
 181 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE.  */
 182
 183 rtx
 184 default_builtin_setjmp_frame_value (void)
 185 {
 186   return virtual_stack_vars_rtx;
 187 }
 188
 189 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false.  */
 190
 191 bool
 192 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED)
 193 {
 194   return false;
 195 }
 196
 197 bool
 198 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED)
 199 {
 200   return (targetm.calls.setup_incoming_varargs
 201           != default_setup_incoming_varargs);
 202 }
 203
 204 enum machine_mode
 205 default_eh_return_filter_mode (void)
 206 {
 207   return targetm.unwind_word_mode ();
 208 }
 209
 210 enum machine_mode
 211 default_libgcc_cmp_return_mode (void)
 212 {
 213   return word_mode;
 214 }
 215
 216 enum machine_mode
 217 default_libgcc_shift_count_mode (void)
 218 {
 219   return word_mode;
 220 }
 221
 222 enum machine_mode
 223 default_unwind_word_mode (void)
 224 {
 225   return word_mode;
 226 }
 227
 228 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK.  */
 229
 230 unsigned HOST_WIDE_INT
 231 default_shift_truncation_mask (enum machine_mode mode)
 232 {
 233   return SHIFT_COUNT_TRUNCATED ? GET_MODE_BITSIZE (mode) - 1 : 0;
 234 }
 235
 236 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL.  */
 237
 238 unsigned int
 239 default_min_divisions_for_recip_mul (enum machine_mode mode ATTRIBUTE_UNUSED)
 240 {
 241   return have_insn_for (DIV, mode) ? 3 : 2;
 242 }
 243
 244 /* The default implementation of TARGET_MODE_REP_EXTENDED.  */
 245
 246 int
 247 default_mode_rep_extended (enum machine_mode mode ATTRIBUTE_UNUSED,
 248                            enum machine_mode mode_rep ATTRIBUTE_UNUSED)
 249 {
 250   return UNKNOWN;
 251 }
 252
 253 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true.  */
 254
 255 bool
 256 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED)
 257 {
 258   return true;
 259 }
 260
 261 /* Return machine mode for non-standard suffix
 262    or VOIDmode if non-standard suffixes are unsupported.  */
 263 enum machine_mode
 264 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED)
 265 {
 266   return VOIDmode;
 267 }
 268
 269 /* The generic C++ ABI specifies this is a 64-bit value.  */
 270 tree
 271 default_cxx_guard_type (void)
 272 {
 273   return long_long_integer_type_node;
 274 }
 275
 276
 277 /* Returns the size of the cookie to use when allocating an array
 278    whose elements have the indicated TYPE.  Assumes that it is already
 279    known that a cookie is needed.  */
 280
 281 tree
 282 default_cxx_get_cookie_size (tree type)
 283 {
 284   tree cookie_size;
 285
 286   /* We need to allocate an additional max (sizeof (size_t), alignof
 287      (true_type)) bytes.  */
 288   tree sizetype_size;
 289   tree type_align;
 290
 291   sizetype_size = size_in_bytes (sizetype);
 292   type_align = size_int (TYPE_ALIGN_UNIT (type));
 293   if (INT_CST_LT_UNSIGNED (type_align, sizetype_size))
 294     cookie_size = sizetype_size;
 295   else
 296     cookie_size = type_align;
 297
 298   return cookie_size;
 299 }
 300
 301 /* Return true if a parameter must be passed by reference.  This version
 302    of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK.  */
 303
 304 bool
 305 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED,
 306         enum machine_mode mode ATTRIBUTE_UNUSED, const_tree type ATTRIBUTE_UNUSED,
 307         bool named_arg ATTRIBUTE_UNUSED)
 308 {
 309   return targetm.calls.must_pass_in_stack (mode, type);
 310 }
 311
 312 /* Return true if a parameter follows callee copies conventions.  This
 313    version of the hook is true for all named arguments.  */
 314
 315 bool
 316 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED,
 317                           enum machine_mode mode ATTRIBUTE_UNUSED,
 318                           const_tree type ATTRIBUTE_UNUSED, bool named)
 319 {
 320   return named;
 321 }
 322
 323 /* Emit to STREAM the assembler syntax for insn operand X.  */
 324
 325 void
 326 default_print_operand (FILE *stream ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
 327                        int code ATTRIBUTE_UNUSED)
 328 {
 329 #ifdef PRINT_OPERAND
 330   PRINT_OPERAND (stream, x, code);
 331 #else
 332   gcc_unreachable ();
 333 #endif
 334 }
 335
 336 /* Emit to STREAM the assembler syntax for an insn operand whose memory
 337    address is X.  */
 338
 339 void
 340 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED,
 341                                rtx x ATTRIBUTE_UNUSED)
 342 {
 343 #ifdef PRINT_OPERAND_ADDRESS
 344   PRINT_OPERAND_ADDRESS (stream, x);
 345 #else
 346   gcc_unreachable ();
 347 #endif
 348 }
 349
 350 /* Return true if CODE is a valid punctuation character for the
 351    `print_operand' hook.  */
 352
 353 bool
 354 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED)
 355 {
 356 #ifdef PRINT_OPERAND_PUNCT_VALID_P
 357   return PRINT_OPERAND_PUNCT_VALID_P (code);
 358 #else
 359   return false;
 360 #endif
 361 }
 362
 363 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME.  */
 364 tree
 365 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED)
 366 {
 367   const char *skipped = name + (*name == '*' ? 1 : 0);
 368   const char *stripped = targetm.strip_name_encoding (skipped);
 369   if (*name != '*' && user_label_prefix[0])
 370     stripped = ACONCAT ((user_label_prefix, stripped, NULL));
 371   return get_identifier (stripped);
 372 }
 373
 374 /* The default implementation of TARGET_ASM_OUTPUT_ADDR_CONST_EXTRA.  */
 375
 376 bool
 377 default_asm_output_addr_const_extra (FILE *file ATTRIBUTE_UNUSED,
 378                                      rtx x ATTRIBUTE_UNUSED)
 379 {
 380 #ifdef OUTPUT_ADDR_CONST_EXTRA
 381   OUTPUT_ADDR_CONST_EXTRA (file, x, fail);
 382   return true;
 383
 384 fail:
 385 #endif
 386   return false;
 387 }
 388
 389 /* True if MODE is valid for the target.  By "valid", we mean able to
 390    be manipulated in non-trivial ways.  In particular, this means all
 391    the arithmetic is supported.
 392
 393    By default we guess this means that any C type is supported.  If
 394    we can't map the mode back to a type that would be available in C,
 395    then reject it.  Special case, here, is the double-word arithmetic
 396    supported by optabs.c.  */
 397
 398 bool
 399 default_scalar_mode_supported_p (enum machine_mode mode)
 400 {
 401   int precision = GET_MODE_PRECISION (mode);
 402
 403   switch (GET_MODE_CLASS (mode))
 404     {
 405     case MODE_PARTIAL_INT:
 406     case MODE_INT:
 407       if (precision == CHAR_TYPE_SIZE)
 408         return true;
 409       if (precision == SHORT_TYPE_SIZE)
 410         return true;
 411       if (precision == INT_TYPE_SIZE)
 412         return true;
 413       if (precision == LONG_TYPE_SIZE)
 414         return true;
 415       if (precision == LONG_LONG_TYPE_SIZE)
 416         return true;
 417       if (precision == 2 * BITS_PER_WORD)
 418         return true;
 419       return false;
 420
 421     case MODE_FLOAT:
 422       if (precision == FLOAT_TYPE_SIZE)
 423         return true;
 424       if (precision == DOUBLE_TYPE_SIZE)
 425         return true;
 426       if (precision == LONG_DOUBLE_TYPE_SIZE)
 427         return true;
 428       return false;
 429
 430     case MODE_DECIMAL_FLOAT:
 431     case MODE_FRACT:
 432     case MODE_UFRACT:
 433     case MODE_ACCUM:
 434     case MODE_UACCUM:
 435       return false;
 436
 437     default:
 438       gcc_unreachable ();
 439     }
 440 }
 441
 442 /* Make some target macros useable by target-independent code.  */
 443 bool
 444 targhook_words_big_endian (void)
 445 {
 446   return !!WORDS_BIG_ENDIAN;
 447 }
 448
 449 bool
 450 targhook_float_words_big_endian (void)
 451 {
 452   return !!FLOAT_WORDS_BIG_ENDIAN;
 453 }
 454
 455 /* True if the target supports decimal floating point.  */
 456
 457 bool
 458 default_decimal_float_supported_p (void)
 459 {
 460   return ENABLE_DECIMAL_FLOAT;
 461 }
 462
 463 /* True if the target supports fixed-point arithmetic.  */
 464
 465 bool
 466 default_fixed_point_supported_p (void)
 467 {
 468   return ENABLE_FIXED_POINT;
 469 }
 470
 471 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
 472    an error message.
 473
 474    This function checks whether a given INSN is valid within a low-overhead
 475    loop.  If INSN is invalid it returns the reason for that, otherwise it
 476    returns NULL. A called function may clobber any special registers required
 477    for low-overhead looping. Additionally, some targets (eg, PPC) use the count
 478    register for branch on table instructions. We reject the doloop pattern in
 479    these cases.  */
 480
 481 const char *
 482 default_invalid_within_doloop (const_rtx insn)
 483 {
 484   if (CALL_P (insn))
 485     return "Function call in loop.";
 486
 487   if (JUMP_TABLE_DATA_P (insn))
 488     return "Computed branch in the loop.";
 489
 490   return NULL;
 491 }
 492
 493 /* Mapping of builtin functions to vectorized variants.  */
 494
 495 tree
 496 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED,
 497                                      tree type_out ATTRIBUTE_UNUSED,
 498                                      tree type_in ATTRIBUTE_UNUSED)
 499 {
 500   return NULL_TREE;
 501 }
 502
 503 /* Vectorized conversion.  */
 504
 505 tree
 506 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED,
 507                                        tree dest_type ATTRIBUTE_UNUSED,
 508                                        tree src_type ATTRIBUTE_UNUSED)
 509 {
 510   return NULL_TREE;
 511 }
 512
 513 /* Default vectorizer cost model values.  */
 514
 515 int
 516 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
 517                                     tree vectype ATTRIBUTE_UNUSED,
 518                                     int misalign ATTRIBUTE_UNUSED)
 519 {
 520   switch (type_of_cost)
 521     {
 522       case scalar_stmt:
 523       case scalar_load:
 524       case scalar_store:
 525       case vector_stmt:
 526       case vector_load:
 527       case vector_store:
 528       case vec_to_scalar:
 529       case scalar_to_vec:
 530       case cond_branch_not_taken:
 531       case vec_perm:
 532         return 1;
 533
 534       case unaligned_load:
 535       case unaligned_store:
 536         return 2;
 537
 538       case cond_branch_taken:
 539         return 3;
 540
 541       default:
 542         gcc_unreachable ();
 543     }
 544 }
 545
 546 /* Reciprocal.  */
 547
 548 tree
 549 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED,
 550                             bool md_fn ATTRIBUTE_UNUSED,
 551                             bool sqrt ATTRIBUTE_UNUSED)
 552 {
 553   return NULL_TREE;
 554 }
 555
 556 bool
 557 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
 558         cumulative_args_t ca ATTRIBUTE_UNUSED,
 559         enum machine_mode mode ATTRIBUTE_UNUSED,
 560         const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
 561 {
 562   return false;
 563 }
 564
 565 bool
 566 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
 567         cumulative_args_t ca ATTRIBUTE_UNUSED,
 568         enum machine_mode mode ATTRIBUTE_UNUSED,
 569         const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
 570 {
 571   return true;
 572 }
 573
 574 int
 575 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
 576         cumulative_args_t ca ATTRIBUTE_UNUSED,
 577         enum machine_mode mode ATTRIBUTE_UNUSED,
 578         tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
 579 {
 580   return 0;
 581 }
 582
 583 void
 584 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED,
 585                               enum machine_mode mode ATTRIBUTE_UNUSED,
 586                               const_tree type ATTRIBUTE_UNUSED,
 587                               bool named ATTRIBUTE_UNUSED)
 588 {
 589   gcc_unreachable ();
 590 }
 591
 592 rtx
 593 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
 594                       enum machine_mode mode ATTRIBUTE_UNUSED,
 595                       const_tree type ATTRIBUTE_UNUSED,
 596                       bool named ATTRIBUTE_UNUSED)
 597 {
 598   gcc_unreachable ();
 599 }
 600
 601 rtx
 602 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
 603                                enum machine_mode mode ATTRIBUTE_UNUSED,
 604                                const_tree type ATTRIBUTE_UNUSED,
 605                                bool named ATTRIBUTE_UNUSED)
 606 {
 607   gcc_unreachable ();
 608 }
 609
 610 unsigned int
 611 default_function_arg_boundary (enum machine_mode mode ATTRIBUTE_UNUSED,
 612                                const_tree type ATTRIBUTE_UNUSED)
 613 {
 614   return PARM_BOUNDARY;
 615 }
 616
 617 unsigned int
 618 default_function_arg_round_boundary (enum machine_mode mode ATTRIBUTE_UNUSED,
 619                                      const_tree type ATTRIBUTE_UNUSED)
 620 {
 621   return PARM_BOUNDARY;
 622 }
 623
 624 void
 625 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED)
 626 {
 627 }
 628
 629 const char *
 630 hook_invalid_arg_for_unprototyped_fn (
 631         const_tree typelist ATTRIBUTE_UNUSED,
 632         const_tree funcdecl ATTRIBUTE_UNUSED,
 633         const_tree val ATTRIBUTE_UNUSED)
 634 {
 635   return NULL;
 636 }
 637
 638 /* Initialize the stack protection decls.  */
 639
 640 /* Stack protection related decls living in libgcc.  */
 641 static GTY(()) tree stack_chk_guard_decl;
 642
 643 tree
 644 default_stack_protect_guard (void)
 645 {
 646   tree t = stack_chk_guard_decl;
 647
 648   if (t == NULL)
 649     {
 650       rtx x;
 651
 652       t = build_decl (UNKNOWN_LOCATION,
 653                       VAR_DECL, get_identifier ("__stack_chk_guard"),
 654                       ptr_type_node);
 655       TREE_STATIC (t) = 1;
 656       TREE_PUBLIC (t) = 1;
 657       DECL_EXTERNAL (t) = 1;
 658       TREE_USED (t) = 1;
 659       TREE_THIS_VOLATILE (t) = 1;
 660       DECL_ARTIFICIAL (t) = 1;
 661       DECL_IGNORED_P (t) = 1;
 662
 663       /* Do not share RTL as the declaration is visible outside of
 664          current function.  */
 665       x = DECL_RTL (t);
 666       RTX_FLAG (x, used) = 1;
 667
 668       stack_chk_guard_decl = t;
 669     }
 670
 671   return t;
 672 }
 673
 674 static GTY(()) tree stack_chk_fail_decl;
 675
 676 tree
 677 default_external_stack_protect_fail (void)
 678 {
 679   tree t = stack_chk_fail_decl;
 680
 681   if (t == NULL_TREE)
 682     {
 683       t = build_function_type_list (void_type_node, NULL_TREE);
 684       t = build_decl (UNKNOWN_LOCATION,
 685                       FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
 686       TREE_STATIC (t) = 1;
 687       TREE_PUBLIC (t) = 1;
 688       DECL_EXTERNAL (t) = 1;
 689       TREE_USED (t) = 1;
 690       TREE_THIS_VOLATILE (t) = 1;
 691       TREE_NOTHROW (t) = 1;
 692       DECL_ARTIFICIAL (t) = 1;
 693       DECL_IGNORED_P (t) = 1;
 694       DECL_VISIBILITY (t) = VISIBILITY_DEFAULT;
 695       DECL_VISIBILITY_SPECIFIED (t) = 1;
 696
 697       stack_chk_fail_decl = t;
 698     }
 699
 700   return build_call_expr (t, 0);
 701 }
 702
 703 tree
 704 default_hidden_stack_protect_fail (void)
 705 {
 706 #ifndef HAVE_GAS_HIDDEN
 707   return default_external_stack_protect_fail ();
 708 #else
 709   tree t = stack_chk_fail_decl;
 710
 711   if (!flag_pic)
 712     return default_external_stack_protect_fail ();
 713
 714   if (t == NULL_TREE)
 715     {
 716       t = build_function_type_list (void_type_node, NULL_TREE);
 717       t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
 718                       get_identifier ("__stack_chk_fail_local"), t);
 719       TREE_STATIC (t) = 1;
 720       TREE_PUBLIC (t) = 1;
 721       DECL_EXTERNAL (t) = 1;
 722       TREE_USED (t) = 1;
 723       TREE_THIS_VOLATILE (t) = 1;
 724       TREE_NOTHROW (t) = 1;
 725       DECL_ARTIFICIAL (t) = 1;
 726       DECL_IGNORED_P (t) = 1;
 727       DECL_VISIBILITY_SPECIFIED (t) = 1;
 728       DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
 729
 730       stack_chk_fail_decl = t;
 731     }
 732
 733   return build_call_expr (t, 0);
 734 #endif
 735 }
 736
 737 bool
 738 hook_bool_const_rtx_commutative_p (const_rtx x,
 739                                    int outer_code ATTRIBUTE_UNUSED)
 740 {
 741   return COMMUTATIVE_P (x);
 742 }
 743
 744 rtx
 745 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED,
 746                         const_tree fn_decl_or_type,
 747                         bool outgoing ATTRIBUTE_UNUSED)
 748 {
 749   /* The old interface doesn't handle receiving the function type.  */
 750   if (fn_decl_or_type
 751       && !DECL_P (fn_decl_or_type))
 752     fn_decl_or_type = NULL;
 753
 754 #ifdef FUNCTION_VALUE
 755   return FUNCTION_VALUE (ret_type, fn_decl_or_type);
 756 #else
 757   gcc_unreachable ();
 758 #endif
 759 }
 760
 761 rtx
 762 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED,
 763                        const_rtx fun ATTRIBUTE_UNUSED)
 764 {
 765 #ifdef LIBCALL_VALUE
 766   return LIBCALL_VALUE (mode);
 767 #else
 768   gcc_unreachable ();
 769 #endif
 770 }
 771
 772 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P.  */
 773
 774 bool
 775 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED)
 776 {
 777 #ifdef FUNCTION_VALUE_REGNO_P
 778   return FUNCTION_VALUE_REGNO_P (regno);
 779 #else
 780   gcc_unreachable ();
 781 #endif
 782 }
 783
 784 rtx
 785 default_internal_arg_pointer (void)
 786 {
 787   /* If the reg that the virtual arg pointer will be translated into is
 788      not a fixed reg or is the stack pointer, make a copy of the virtual
 789      arg pointer, and address parms via the copy.  The frame pointer is
 790      considered fixed even though it is not marked as such.  */
 791   if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
 792        || ! (fixed_regs[ARG_POINTER_REGNUM]
 793              || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
 794     return copy_to_reg (virtual_incoming_args_rtx);
 795   else
 796     return virtual_incoming_args_rtx;
 797 }
 798
 799 rtx
 800 default_static_chain (const_tree fndecl, bool incoming_p)
 801 {
 802   if (!DECL_STATIC_CHAIN (fndecl))
 803     return NULL;
 804
 805   if (incoming_p)
 806     {
 807 #ifdef STATIC_CHAIN_INCOMING_REGNUM
 808       return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
 809 #endif
 810     }
 811
 812 #ifdef STATIC_CHAIN_REGNUM
 813   return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
 814 #endif
 815
 816   {
 817     static bool issued_error;
 818     if (!issued_error)
 819       {
 820         issued_error = true;
 821         sorry ("nested functions not supported on this target");
 822       }
 823
 824     /* It really doesn't matter what we return here, so long at it
 825        doesn't cause the rest of the compiler to crash.  */
 826     return gen_rtx_MEM (Pmode, stack_pointer_rtx);
 827   }
 828 }
 829
 830 void
 831 default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func),
 832                          rtx ARG_UNUSED (r_chain))
 833 {
 834   sorry ("nested function trampolines not supported on this target");
 835 }
 836
 837 int
 838 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED,
 839                           tree funtype ATTRIBUTE_UNUSED,
 840                           int size ATTRIBUTE_UNUSED)
 841 {
 842   return 0;
 843 }
 844
 845 reg_class_t
 846 default_branch_target_register_class (void)
 847 {
 848   return NO_REGS;
 849 }
 850
 851 reg_class_t
 852 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
 853                           reg_class_t reload_class_i ATTRIBUTE_UNUSED,
 854                           enum machine_mode reload_mode ATTRIBUTE_UNUSED,
 855                           secondary_reload_info *sri)
 856 {
 857   enum reg_class rclass = NO_REGS;
 858   enum reg_class reload_class = (enum reg_class) reload_class_i;
 859
 860   if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing)
 861     {
 862       sri->icode = sri->prev_sri->t_icode;
 863       return NO_REGS;
 864     }
 865 #ifdef SECONDARY_INPUT_RELOAD_CLASS
 866   if (in_p)
 867     rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class, reload_mode, x);
 868 #endif
 869 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
 870   if (! in_p)
 871     rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class, reload_mode, x);
 872 #endif
 873   if (rclass != NO_REGS)
 874     {
 875       enum insn_code icode
 876         = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab,
 877                                 reload_mode);
 878
 879       if (icode != CODE_FOR_nothing
 880           && !insn_operand_matches (icode, in_p, x))
 881         icode = CODE_FOR_nothing;
 882       else if (icode != CODE_FOR_nothing)
 883         {
 884           const char *insn_constraint, *scratch_constraint;
 885           char insn_letter, scratch_letter;
 886           enum reg_class insn_class, scratch_class;
 887
 888           gcc_assert (insn_data[(int) icode].n_operands == 3);
 889           insn_constraint = insn_data[(int) icode].operand[!in_p].constraint;
 890           if (!*insn_constraint)
 891             insn_class = ALL_REGS;
 892           else
 893             {
 894               if (in_p)
 895                 {
 896                   gcc_assert (*insn_constraint == '=');
 897                   insn_constraint++;
 898                 }
 899               insn_letter = *insn_constraint;
 900               insn_class
 901                 = (insn_letter == 'r' ? GENERAL_REGS
 902                    : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter,
 903                                                 insn_constraint));
 904               gcc_assert (insn_class != NO_REGS);
 905             }
 906
 907           scratch_constraint = insn_data[(int) icode].operand[2].constraint;
 908           /* The scratch register's constraint must start with "=&",
 909              except for an input reload, where only "=" is necessary,
 910              and where it might be beneficial to re-use registers from
 911              the input.  */
 912           gcc_assert (scratch_constraint[0] == '='
 913                       && (in_p || scratch_constraint[1] == '&'));
 914           scratch_constraint++;
 915           if (*scratch_constraint == '&')
 916             scratch_constraint++;
 917           scratch_letter = *scratch_constraint;
 918           scratch_class
 919             = (scratch_letter == 'r' ? GENERAL_REGS
 920                : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter,
 921                                             scratch_constraint));
 922
 923           if (reg_class_subset_p (reload_class, insn_class))
 924             {
 925               gcc_assert (scratch_class == rclass);
 926               rclass = NO_REGS;
 927             }
 928           else
 929             rclass = insn_class;
 930
 931         }
 932       if (rclass == NO_REGS)
 933         sri->icode = icode;
 934       else
 935         sri->t_icode = icode;
 936     }
 937   return rclass;
 938 }
 939
 940 /* By default, if flag_pic is true, then neither local nor global relocs
 941    should be placed in readonly memory.  */
 942
 943 int
 944 default_reloc_rw_mask (void)
 945 {
 946   return flag_pic ? 3 : 0;
 947 }
 948
 949 /* By default, do no modification. */
 950 tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
 951                                          tree id)
 952 {
 953    return id;
 954 }
 955
 956 bool
 957 default_builtin_vector_alignment_reachable (const_tree type, bool is_packed)
 958 {
 959   if (is_packed)
 960     return false;
 961
 962   /* Assuming that types whose size is > pointer-size are not guaranteed to be
 963      naturally aligned.  */
 964   if (tree_int_cst_compare (TYPE_SIZE (type), bitsize_int (POINTER_SIZE)) > 0)
 965     return false;
 966
 967   /* Assuming that types whose size is <= pointer-size
 968      are naturally aligned.  */
 969   return true;
 970 }
 971
 972 /* By default, assume that a target supports any factor of misalignment
 973    memory access if it supports movmisalign patten.
 974    is_packed is true if the memory access is defined in a packed struct.  */
 975 bool
 976 default_builtin_support_vector_misalignment (enum machine_mode mode,
 977                                              const_tree type
 978                                              ATTRIBUTE_UNUSED,
 979                                              int misalignment
 980                                              ATTRIBUTE_UNUSED,
 981                                              bool is_packed
 982                                              ATTRIBUTE_UNUSED)
 983 {
 984   if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing)
 985     return true;
 986   return false;
 987 }
 988
 989 /* By default, only attempt to parallelize bitwise operations, and
 990    possibly adds/subtracts using bit-twiddling.  */
 991
 992 enum machine_mode
 993 default_preferred_simd_mode (enum machine_mode mode ATTRIBUTE_UNUSED)
 994 {
 995   return word_mode;
 996 }
 997
 998 /* By default only the size derived from the preferred vector mode
 999    is tried.  */
1000
1001 unsigned int
1002 default_autovectorize_vector_sizes (void)
1003 {
1004   return 0;
1005 }
1006
1007 /* Determine whether or not a pointer mode is valid. Assume defaults
1008    of ptr_mode or Pmode - can be overridden.  */
1009 bool
1010 default_valid_pointer_mode (enum machine_mode mode)
1011 {
1012   return (mode == ptr_mode || mode == Pmode);
1013 }
1014
1015 /* Determine whether the memory reference specified by REF may alias
1016    the C libraries errno location.  */
1017 bool
1018 default_ref_may_alias_errno (ao_ref *ref)
1019 {
1020   tree base = ao_ref_base (ref);
1021   /* The default implementation assumes the errno location is
1022      a declaration of type int or is always accessed via a
1023      pointer to int.  We assume that accesses to errno are
1024      not deliberately obfuscated (even in conforming ways).  */
1025   if (TYPE_UNSIGNED (TREE_TYPE (base))
1026       || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node))
1027     return false;
1028   /* The default implementation assumes an errno location
1029      declaration is never defined in the current compilation unit.  */
1030   if (DECL_P (base)
1031       && !TREE_STATIC (base))
1032     return true;
1033   else if (TREE_CODE (base) == MEM_REF
1034            && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
1035     {
1036       struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0));
1037       return !pi || pi->pt.anything || pi->pt.nonlocal;
1038     }
1039   return false;
1040 }
1041
1042 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
1043    for the generic address space only.  */
1044
1045 enum machine_mode
1046 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1047 {
1048   gcc_assert (ADDR_SPACE_GENERIC_P (addrspace));
1049   return ptr_mode;
1050 }
1051
1052 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1053    for the generic address space only.  */
1054
1055 enum machine_mode
1056 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1057 {
1058   gcc_assert (ADDR_SPACE_GENERIC_P (addrspace));
1059   return Pmode;
1060 }
1061
1062 /* Named address space version of valid_pointer_mode.  */
1063
1064 bool
1065 default_addr_space_valid_pointer_mode (enum machine_mode mode, addr_space_t as)
1066 {
1067   if (!ADDR_SPACE_GENERIC_P (as))
1068     return (mode == targetm.addr_space.pointer_mode (as)
1069             || mode == targetm.addr_space.address_mode (as));
1070
1071   return targetm.valid_pointer_mode (mode);
1072 }
1073
1074 /* Some places still assume that all pointer or address modes are the
1075    standard Pmode and ptr_mode.  These optimizations become invalid if
1076    the target actually supports multiple different modes.  For now,
1077    we disable such optimizations on such targets, using this function.  */
1078
1079 bool
1080 target_default_pointer_address_modes_p (void)
1081 {
1082   if (targetm.addr_space.address_mode != default_addr_space_address_mode)
1083     return false;
1084   if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
1085     return false;
1086
1087   return true;
1088 }
1089
1090 /* Named address space version of legitimate_address_p.  */
1091
1092 bool
1093 default_addr_space_legitimate_address_p (enum machine_mode mode, rtx mem,
1094                                          bool strict, addr_space_t as)
1095 {
1096   if (!ADDR_SPACE_GENERIC_P (as))
1097     gcc_unreachable ();
1098
1099   return targetm.legitimate_address_p (mode, mem, strict);
1100 }
1101
1102 /* Named address space version of LEGITIMIZE_ADDRESS.  */
1103
1104 rtx
1105 default_addr_space_legitimize_address (rtx x, rtx oldx,
1106                                        enum machine_mode mode, addr_space_t as)
1107 {
1108   if (!ADDR_SPACE_GENERIC_P (as))
1109     return x;
1110
1111   return targetm.legitimize_address (x, oldx, mode);
1112 }
1113
1114 /* The default hook for determining if one named address space is a subset of
1115    another and to return which address space to use as the common address
1116    space.  */
1117
1118 bool
1119 default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
1120 {
1121   return (subset == superset);
1122 }
1123
1124 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1125    called for targets with only a generic address space.  */
1126
1127 rtx
1128 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
1129                             tree from_type ATTRIBUTE_UNUSED,
1130                             tree to_type ATTRIBUTE_UNUSED)
1131 {
1132   gcc_unreachable ();
1133 }
1134
1135 bool
1136 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
1137 {
1138   return true;
1139 }
1140
1141 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P.  */
1142
1143 bool
1144 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED)
1145 {
1146 #ifdef GO_IF_MODE_DEPENDENT_ADDRESS
1147
1148   GO_IF_MODE_DEPENDENT_ADDRESS (CONST_CAST_RTX (addr), win);
1149   return false;
1150   /* Label `win' might (not) be used via GO_IF_MODE_DEPENDENT_ADDRESS.  */
1151  win: ATTRIBUTE_UNUSED_LABEL
1152   return true;
1153
1154 #else
1155
1156   return false;
1157
1158 #endif
1159 }
1160
1161 bool
1162 default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
1163                                          tree ARG_UNUSED (name),
1164                                          tree ARG_UNUSED (args),
1165                                          int ARG_UNUSED (flags))
1166 {
1167   warning (OPT_Wattributes,
1168            "target attribute is not supported on this machine");
1169
1170   return false;
1171 }
1172
1173 bool
1174 default_target_option_pragma_parse (tree ARG_UNUSED (args),
1175                                     tree ARG_UNUSED (pop_target))
1176 {
1177   warning (OPT_Wpragmas,
1178            "#pragma GCC target is not supported for this machine");
1179
1180   return false;
1181 }
1182
1183 bool
1184 default_target_can_inline_p (tree caller, tree callee)
1185 {
1186   bool ret = false;
1187   tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
1188   tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
1189
1190   /* If callee has no option attributes, then it is ok to inline */
1191   if (!callee_opts)
1192     ret = true;
1193
1194   /* If caller has no option attributes, but callee does then it is not ok to
1195      inline */
1196   else if (!caller_opts)
1197     ret = false;
1198
1199   /* If both caller and callee have attributes, assume that if the
1200      pointer is different, the two functions have different target
1201      options since build_target_option_node uses a hash table for the
1202      options.  */
1203   else
1204     ret = (callee_opts == caller_opts);
1205
1206   return ret;
1207 }
1208
1209 #ifndef HAVE_casesi
1210 # define HAVE_casesi 0
1211 #endif
1212
1213 /* If the machine does not have a case insn that compares the bounds,
1214    this means extra overhead for dispatch tables, which raises the
1215    threshold for using them.  */
1216
1217 unsigned int default_case_values_threshold (void)
1218 {
1219   return (HAVE_casesi ? 4 : 5);
1220 }
1221
1222 bool
1223 default_have_conditional_execution (void)
1224 {
1225 #ifdef HAVE_conditional_execution
1226   return HAVE_conditional_execution;
1227 #else
1228   return false;
1229 #endif
1230 }
1231
1232 /* Compute cost of moving registers to/from memory.  */
1233
1234 int
1235 default_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED,
1236                           reg_class_t rclass ATTRIBUTE_UNUSED,
1237                           bool in ATTRIBUTE_UNUSED)
1238 {
1239 #ifndef MEMORY_MOVE_COST
1240     return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in));
1241 #else
1242     return MEMORY_MOVE_COST (mode, (enum reg_class) rclass, in);
1243 #endif
1244 }
1245
1246 /* Compute cost of moving data from a register of class FROM to one of
1247    TO, using MODE.  */
1248
1249 int
1250 default_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED,
1251                             reg_class_t from ATTRIBUTE_UNUSED,
1252                             reg_class_t to ATTRIBUTE_UNUSED)
1253 {
1254 #ifndef REGISTER_MOVE_COST
1255   return 2;
1256 #else
1257   return REGISTER_MOVE_COST (mode, (enum reg_class) from, (enum reg_class) to);
1258 #endif
1259 }
1260
1261 bool
1262 default_profile_before_prologue (void)
1263 {
1264 #ifdef PROFILE_BEFORE_PROLOGUE
1265   return true;
1266 #else
1267   return false;
1268 #endif
1269 }
1270
1271 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS.  */
1272
1273 reg_class_t
1274 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED,
1275                                 reg_class_t rclass)
1276 {
1277 #ifdef PREFERRED_RELOAD_CLASS
1278   return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass);
1279 #else
1280   return rclass;
1281 #endif
1282 }
1283
1284 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS.  */
1285
1286 reg_class_t
1287 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED,
1288                                        reg_class_t rclass)
1289 {
1290 #ifdef PREFERRED_OUTPUT_RELOAD_CLASS
1291   return PREFERRED_OUTPUT_RELOAD_CLASS (x, (enum reg_class) rclass);
1292 #else
1293   return rclass;
1294 #endif
1295 }
1296
1297 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS.  */
1298 reg_class_t
1299 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED)
1300 {
1301   return NO_REGS;
1302 }
1303
1304 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P.  */
1305
1306 bool
1307 default_class_likely_spilled_p (reg_class_t rclass)
1308 {
1309   return (reg_class_size[(int) rclass] == 1);
1310 }
1311
1312 /* Determine the debugging unwind mechanism for the target.  */
1313
1314 enum unwind_info_type
1315 default_debug_unwind_info (void)
1316 {
1317   /* If the target wants to force the use of dwarf2 unwind info, let it.  */
1318   /* ??? Change all users to the hook, then poison this.  */
1319 #ifdef DWARF2_FRAME_INFO
1320   if (DWARF2_FRAME_INFO)
1321     return UI_DWARF2;
1322 #endif
1323
1324   /* Otherwise, only turn it on if dwarf2 debugging is enabled.  */
1325 #ifdef DWARF2_DEBUGGING_INFO
1326   if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1327     return UI_DWARF2;
1328 #endif
1329
1330   return UI_NONE;
1331 }
1332
1333 /* To be used by targets where reg_raw_mode doesn't return the right
1334    mode for registers used in apply_builtin_return and apply_builtin_arg.  */
1335
1336 enum machine_mode
1337 default_get_reg_raw_mode(int regno)
1338 {
1339   return reg_raw_mode[regno];
1340 }
1341
1342 /* Return true if the state of option OPTION should be stored in PCH files
1343    and checked by default_pch_valid_p.  Store the option's current state
1344    in STATE if so.  */
1345
1346 static inline bool
1347 option_affects_pch_p (int option, struct cl_option_state *state)
1348 {
1349   if ((cl_options[option].flags & CL_TARGET) == 0)
1350     return false;
1351   if (option_flag_var (option, &global_options) == &target_flags)
1352     if (targetm.check_pch_target_flags)
1353       return false;
1354   return get_option_state (&global_options, option, state);
1355 }
1356
1357 /* Default version of get_pch_validity.
1358    By default, every flag difference is fatal; that will be mostly right for
1359    most targets, but completely right for very few.  */
1360
1361 void *
1362 default_get_pch_validity (size_t *sz)
1363 {
1364   struct cl_option_state state;
1365   size_t i;
1366   char *result, *r;
1367
1368   *sz = 2;
1369   if (targetm.check_pch_target_flags)
1370     *sz += sizeof (target_flags);
1371   for (i = 0; i < cl_options_count; i++)
1372     if (option_affects_pch_p (i, &state))
1373       *sz += state.size;
1374
1375   result = r = XNEWVEC (char, *sz);
1376   r[0] = flag_pic;
1377   r[1] = flag_pie;
1378   r += 2;
1379   if (targetm.check_pch_target_flags)
1380     {
1381       memcpy (r, &target_flags, sizeof (target_flags));
1382       r += sizeof (target_flags);
1383     }
1384
1385   for (i = 0; i < cl_options_count; i++)
1386     if (option_affects_pch_p (i, &state))
1387       {
1388         memcpy (r, state.data, state.size);
1389         r += state.size;
1390       }
1391
1392   return result;
1393 }
1394
1395 /* Return a message which says that a PCH file was created with a different
1396    setting of OPTION.  */
1397
1398 static const char *
1399 pch_option_mismatch (const char *option)
1400 {
1401   char *r;
1402
1403   asprintf (&r, _("created and used with differing settings of '%s'"), option);
1404   if (r == NULL)
1405     return _("out of memory");
1406   return r;
1407 }
1408
1409 /* Default version of pch_valid_p.  */
1410
1411 const char *
1412 default_pch_valid_p (const void *data_p, size_t len)
1413 {
1414   struct cl_option_state state;
1415   const char *data = (const char *)data_p;
1416   size_t i;
1417
1418   /* -fpic and -fpie also usually make a PCH invalid.  */
1419   if (data[0] != flag_pic)
1420     return _("created and used with different settings of -fpic");
1421   if (data[1] != flag_pie)
1422     return _("created and used with different settings of -fpie");
1423   data += 2;
1424
1425   /* Check target_flags.  */
1426   if (targetm.check_pch_target_flags)
1427     {
1428       int tf;
1429       const char *r;
1430
1431       memcpy (&tf, data, sizeof (target_flags));
1432       data += sizeof (target_flags);
1433       len -= sizeof (target_flags);
1434       r = targetm.check_pch_target_flags (tf);
1435       if (r != NULL)
1436         return r;
1437     }
1438
1439   for (i = 0; i < cl_options_count; i++)
1440     if (option_affects_pch_p (i, &state))
1441       {
1442         if (memcmp (data, state.data, state.size) != 0)
1443           return pch_option_mismatch (cl_options[i].opt_text);
1444         data += state.size;
1445         len -= state.size;
1446       }
1447
1448   return NULL;
1449 }
1450
1451 #include "gt-targhooks.h"