1/* Default target hook functions. 2 Copyright (C) 2003-2015 Free Software Foundation, Inc. 3 4This file is part of GCC. 5 6GCC is free software; you can redistribute it and/or modify it under 7the terms of the GNU General Public License as published by the Free 8Software Foundation; either version 3, or (at your option) any later 9version. 10 11GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12WARRANTY; without even the implied warranty of MERCHANTABILITY or 13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14for more details. 15 16You should have received a copy of the GNU General Public License 17along with GCC; see the file COPYING3. If not see 18<http://www.gnu.org/licenses/>. */ 19 20/* The migration of target macros to target hooks works as follows: 21 22 1. Create a target hook that uses the existing target macros to 23 implement the same functionality. 24 25 2. Convert all the MI files to use the hook instead of the macro. 26 27 3. Repeat for a majority of the remaining target macros. This will 28 take some time. 29 30 4. Tell target maintainers to start migrating. 31 32 5. Eventually convert the backends to override the hook instead of 33 defining the macros. This will take some time too. 34 35 6. TBD when, poison the macros. Unmigrated targets will break at 36 this point. 37 38 Note that we expect steps 1-3 to be done by the people that 39 understand what the MI does with each macro, and step 5 to be done 40 by the target maintainers for their respective targets. 41 42 Note that steps 1 and 2 don't have to be done together, but no 43 target can override the new hook until step 2 is complete for it. 44 45 Once the macros are poisoned, we will revert to the old migration 46 rules - migrate the macro, callers, and targets all at once. This 47 comment can thus be removed at that point. */ 48 49#include "config.h" 50#include "system.h" 51#include "coretypes.h" 52#include "tm.h" 53#include "machmode.h" 54#include "rtl.h" 55#include "hash-set.h" 56#include "vec.h" 57#include "double-int.h" 58#include "input.h" 59#include "alias.h" 60#include "symtab.h" 61#include "wide-int.h" 62#include "inchash.h" 63#include "tree.h" 64#include "fold-const.h" 65#include "stor-layout.h" 66#include "varasm.h" 67#include "hashtab.h" 68#include "hard-reg-set.h" 69#include "function.h" 70#include "flags.h" 71#include "statistics.h" 72#include "real.h" 73#include "fixed-value.h" 74#include "insn-config.h" 75#include "expmed.h" 76#include "dojump.h" 77#include "explow.h" 78#include "calls.h" 79#include "emit-rtl.h" 80#include "stmt.h" 81#include "expr.h" 82#include "output.h" 83#include "diagnostic-core.h" 84#include "target.h" 85#include "tm_p.h" 86#include "target-def.h" 87#include "regs.h" 88#include "reload.h" 89#include "insn-codes.h" 90#include "optabs.h" 91#include "recog.h" 92#include "intl.h" 93#include "opts.h" 94#include "tree-ssa-alias.h" 95#include "gimple-expr.h" 96#include "gimplify.h" 97#include "stringpool.h" 98#include "tree-ssanames.h" 99 100 101bool 102default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED, 103 rtx addr ATTRIBUTE_UNUSED, 104 bool strict ATTRIBUTE_UNUSED) 105{ 106#ifdef GO_IF_LEGITIMATE_ADDRESS 107 /* Defer to the old implementation using a goto. */ 108 if (strict) 109 return strict_memory_address_p (mode, addr); 110 else 111 return memory_address_p (mode, addr); 112#else 113 gcc_unreachable (); 114#endif 115} 116 117void 118default_external_libcall (rtx fun ATTRIBUTE_UNUSED) 119{ 120#ifdef ASM_OUTPUT_EXTERNAL_LIBCALL 121 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file, fun); 122#endif 123} 124 125int 126default_unspec_may_trap_p (const_rtx x, unsigned flags) 127{ 128 int i; 129 130 /* Any floating arithmetic may trap. */ 131 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x)) && flag_trapping_math)) 132 return 1; 133 134 for (i = 0; i < XVECLEN (x, 0); ++i) 135 { 136 if (may_trap_p_1 (XVECEXP (x, 0, i), flags)) 137 return 1; 138 } 139 140 return 0; 141} 142 143machine_mode 144default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED, 145 machine_mode mode, 146 int *punsignedp ATTRIBUTE_UNUSED, 147 const_tree funtype ATTRIBUTE_UNUSED, 148 int for_return ATTRIBUTE_UNUSED) 149{ 150 if (type != NULL_TREE && for_return == 2) 151 return promote_mode (type, mode, punsignedp); 152 return mode; 153} 154 155machine_mode 156default_promote_function_mode_always_promote (const_tree type, 157 machine_mode mode, 158 int *punsignedp, 159 const_tree funtype ATTRIBUTE_UNUSED, 160 int for_return ATTRIBUTE_UNUSED) 161{ 162 return promote_mode (type, mode, punsignedp); 163} 164 165machine_mode 166default_cc_modes_compatible (machine_mode m1, machine_mode m2) 167{ 168 if (m1 == m2) 169 return m1; 170 return VOIDmode; 171} 172 173bool 174default_return_in_memory (const_tree type, 175 const_tree fntype ATTRIBUTE_UNUSED) 176{ 177 return (TYPE_MODE (type) == BLKmode); 178} 179 180rtx 181default_legitimize_address (rtx x, rtx orig_x ATTRIBUTE_UNUSED, 182 machine_mode mode ATTRIBUTE_UNUSED) 183{ 184 return x; 185} 186 187bool 188default_legitimize_address_displacement (rtx *disp ATTRIBUTE_UNUSED, 189 rtx *offset ATTRIBUTE_UNUSED, 190 machine_mode mode ATTRIBUTE_UNUSED) 191{ 192 return false; 193} 194 195rtx 196default_expand_builtin_saveregs (void) 197{ 198 error ("__builtin_saveregs not supported by this target"); 199 return const0_rtx; 200} 201 202void 203default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED, 204 machine_mode mode ATTRIBUTE_UNUSED, 205 tree type ATTRIBUTE_UNUSED, 206 int *pretend_arg_size ATTRIBUTE_UNUSED, 207 int second_time ATTRIBUTE_UNUSED) 208{ 209} 210 211/* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */ 212 213rtx 214default_builtin_setjmp_frame_value (void) 215{ 216 return virtual_stack_vars_rtx; 217} 218 219/* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */ 220 221bool 222hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED) 223{ 224 return false; 225} 226 227bool 228default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED) 229{ 230 return (targetm.calls.setup_incoming_varargs 231 != default_setup_incoming_varargs); 232} 233 234machine_mode 235default_eh_return_filter_mode (void) 236{ 237 return targetm.unwind_word_mode (); 238} 239 240machine_mode 241default_libgcc_cmp_return_mode (void) 242{ 243 return word_mode; 244} 245 246machine_mode 247default_libgcc_shift_count_mode (void) 248{ 249 return word_mode; 250} 251 252machine_mode 253default_unwind_word_mode (void) 254{ 255 return word_mode; 256} 257 258/* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */ 259 260unsigned HOST_WIDE_INT 261default_shift_truncation_mask (machine_mode mode) 262{ 263 return SHIFT_COUNT_TRUNCATED ? GET_MODE_BITSIZE (mode) - 1 : 0; 264} 265 266/* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */ 267 268unsigned int 269default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED) 270{ 271 return have_insn_for (DIV, mode) ? 3 : 2; 272} 273 274/* The default implementation of TARGET_MODE_REP_EXTENDED. */ 275 276int 277default_mode_rep_extended (machine_mode mode ATTRIBUTE_UNUSED, 278 machine_mode mode_rep ATTRIBUTE_UNUSED) 279{ 280 return UNKNOWN; 281} 282 283/* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */ 284 285bool 286hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED) 287{ 288 return true; 289} 290 291/* Return machine mode for non-standard suffix 292 or VOIDmode if non-standard suffixes are unsupported. */ 293machine_mode 294default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED) 295{ 296 return VOIDmode; 297} 298 299/* The generic C++ ABI specifies this is a 64-bit value. */ 300tree 301default_cxx_guard_type (void) 302{ 303 return long_long_integer_type_node; 304} 305 306/* Returns the size of the cookie to use when allocating an array 307 whose elements have the indicated TYPE. Assumes that it is already 308 known that a cookie is needed. */ 309 310tree 311default_cxx_get_cookie_size (tree type) 312{ 313 tree cookie_size; 314 315 /* We need to allocate an additional max (sizeof (size_t), alignof 316 (true_type)) bytes. */ 317 tree sizetype_size; 318 tree type_align; 319 320 sizetype_size = size_in_bytes (sizetype); 321 type_align = size_int (TYPE_ALIGN_UNIT (type)); 322 if (tree_int_cst_lt (type_align, sizetype_size)) 323 cookie_size = sizetype_size; 324 else 325 cookie_size = type_align; 326 327 return cookie_size; 328} 329 330/* Return true if a parameter must be passed by reference. This version 331 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */ 332 333bool 334hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED, 335 machine_mode mode ATTRIBUTE_UNUSED, const_tree type ATTRIBUTE_UNUSED, 336 bool named_arg ATTRIBUTE_UNUSED) 337{ 338 return targetm.calls.must_pass_in_stack (mode, type); 339} 340 341/* Return true if a parameter follows callee copies conventions. This 342 version of the hook is true for all named arguments. */ 343 344bool 345hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED, 346 machine_mode mode ATTRIBUTE_UNUSED, 347 const_tree type ATTRIBUTE_UNUSED, bool named) 348{ 349 return named; 350} 351 352/* Emit to STREAM the assembler syntax for insn operand X. */ 353 354void 355default_print_operand (FILE *stream ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED, 356 int code ATTRIBUTE_UNUSED) 357{ 358#ifdef PRINT_OPERAND 359 PRINT_OPERAND (stream, x, code); 360#else 361 gcc_unreachable (); 362#endif 363} 364 365/* Emit to STREAM the assembler syntax for an insn operand whose memory 366 address is X. */ 367 368void 369default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED, 370 rtx x ATTRIBUTE_UNUSED) 371{ 372#ifdef PRINT_OPERAND_ADDRESS 373 PRINT_OPERAND_ADDRESS (stream, x); 374#else 375 gcc_unreachable (); 376#endif 377} 378 379/* Return true if CODE is a valid punctuation character for the 380 `print_operand' hook. */ 381 382bool 383default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED) 384{ 385#ifdef PRINT_OPERAND_PUNCT_VALID_P 386 return PRINT_OPERAND_PUNCT_VALID_P (code); 387#else 388 return false; 389#endif 390} 391 392/* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */ 393tree 394default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED) 395{ 396 const char *skipped = name + (*name == '*' ? 1 : 0); 397 const char *stripped = targetm.strip_name_encoding (skipped); 398 if (*name != '*' && user_label_prefix[0]) 399 stripped = ACONCAT ((user_label_prefix, stripped, NULL)); 400 return get_identifier (stripped); 401} 402 403/* True if MODE is valid for the target. By "valid", we mean able to 404 be manipulated in non-trivial ways. In particular, this means all 405 the arithmetic is supported. 406 407 By default we guess this means that any C type is supported. If 408 we can't map the mode back to a type that would be available in C, 409 then reject it. Special case, here, is the double-word arithmetic 410 supported by optabs.c. */ 411 412bool 413default_scalar_mode_supported_p (machine_mode mode) 414{ 415 int precision = GET_MODE_PRECISION (mode); 416 417 switch (GET_MODE_CLASS (mode)) 418 { 419 case MODE_PARTIAL_INT: 420 case MODE_INT: 421 if (precision == CHAR_TYPE_SIZE) 422 return true; 423 if (precision == SHORT_TYPE_SIZE) 424 return true; 425 if (precision == INT_TYPE_SIZE) 426 return true; 427 if (precision == LONG_TYPE_SIZE) 428 return true; 429 if (precision == LONG_LONG_TYPE_SIZE) 430 return true; 431 if (precision == 2 * BITS_PER_WORD) 432 return true; 433 return false; 434 435 case MODE_FLOAT: 436 if (precision == FLOAT_TYPE_SIZE) 437 return true; 438 if (precision == DOUBLE_TYPE_SIZE) 439 return true; 440 if (precision == LONG_DOUBLE_TYPE_SIZE) 441 return true; 442 return false; 443 444 case MODE_DECIMAL_FLOAT: 445 case MODE_FRACT: 446 case MODE_UFRACT: 447 case MODE_ACCUM: 448 case MODE_UACCUM: 449 return false; 450 451 default: 452 gcc_unreachable (); 453 } 454} 455 456/* Return true if libgcc supports floating-point mode MODE (known to 457 be supported as a scalar mode). */ 458 459bool 460default_libgcc_floating_mode_supported_p (machine_mode mode) 461{ 462 switch (mode) 463 { 464#ifdef HAVE_SFmode 465 case SFmode: 466#endif 467#ifdef HAVE_DFmode 468 case DFmode: 469#endif 470#ifdef HAVE_XFmode 471 case XFmode: 472#endif 473#ifdef HAVE_TFmode 474 case TFmode: 475#endif 476 return true; 477 478 default: 479 return false; 480 } 481} 482 483/* Make some target macros useable by target-independent code. */ 484bool 485targhook_words_big_endian (void) 486{ 487 return !!WORDS_BIG_ENDIAN; 488} 489 490bool 491targhook_float_words_big_endian (void) 492{ 493 return !!FLOAT_WORDS_BIG_ENDIAN; 494} 495 496/* True if the target supports floating-point exceptions and rounding 497 modes. */ 498 499bool 500default_float_exceptions_rounding_supported_p (void) 501{ 502#ifdef HAVE_adddf3 503 return HAVE_adddf3; 504#else 505 return false; 506#endif 507} 508 509/* True if the target supports decimal floating point. */ 510 511bool 512default_decimal_float_supported_p (void) 513{ 514 return ENABLE_DECIMAL_FLOAT; 515} 516 517/* True if the target supports fixed-point arithmetic. */ 518 519bool 520default_fixed_point_supported_p (void) 521{ 522 return ENABLE_FIXED_POINT; 523} 524 525/* True if the target supports GNU indirect functions. */ 526 527bool 528default_has_ifunc_p (void) 529{ 530 return HAVE_GNU_INDIRECT_FUNCTION; 531} 532 533/* NULL if INSN insn is valid within a low-overhead loop, otherwise returns 534 an error message. 535 536 This function checks whether a given INSN is valid within a low-overhead 537 loop. If INSN is invalid it returns the reason for that, otherwise it 538 returns NULL. A called function may clobber any special registers required 539 for low-overhead looping. Additionally, some targets (eg, PPC) use the count 540 register for branch on table instructions. We reject the doloop pattern in 541 these cases. */ 542 543const char * 544default_invalid_within_doloop (const rtx_insn *insn) 545{ 546 if (CALL_P (insn)) 547 return "Function call in loop."; 548 549 if (tablejump_p (insn, NULL, NULL) || computed_jump_p (insn)) 550 return "Computed branch in the loop."; 551 552 return NULL; 553} 554 555/* Mapping of builtin functions to vectorized variants. */ 556 557tree 558default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED, 559 tree type_out ATTRIBUTE_UNUSED, 560 tree type_in ATTRIBUTE_UNUSED) 561{ 562 return NULL_TREE; 563} 564 565/* Vectorized conversion. */ 566 567tree 568default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED, 569 tree dest_type ATTRIBUTE_UNUSED, 570 tree src_type ATTRIBUTE_UNUSED) 571{ 572 return NULL_TREE; 573} 574 575/* Default vectorizer cost model values. */ 576 577int 578default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost, 579 tree vectype, 580 int misalign ATTRIBUTE_UNUSED) 581{ 582 unsigned elements; 583 584 switch (type_of_cost) 585 { 586 case scalar_stmt: 587 case scalar_load: 588 case scalar_store: 589 case vector_stmt: 590 case vector_load: 591 case vector_store: 592 case vec_to_scalar: 593 case scalar_to_vec: 594 case cond_branch_not_taken: 595 case vec_perm: 596 case vec_promote_demote: 597 return 1; 598 599 case unaligned_load: 600 case unaligned_store: 601 return 2; 602 603 case cond_branch_taken: 604 return 3; 605 606 case vec_construct: 607 elements = TYPE_VECTOR_SUBPARTS (vectype); 608 return elements / 2 + 1; 609 610 default: 611 gcc_unreachable (); 612 } 613} 614 615/* Reciprocal. */ 616 617tree 618default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED, 619 bool md_fn ATTRIBUTE_UNUSED, 620 bool sqrt ATTRIBUTE_UNUSED) 621{ 622 return NULL_TREE; 623} 624 625bool 626hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false ( 627 cumulative_args_t ca ATTRIBUTE_UNUSED, 628 machine_mode mode ATTRIBUTE_UNUSED, 629 const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED) 630{ 631 return false; 632} 633 634bool 635hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true ( 636 cumulative_args_t ca ATTRIBUTE_UNUSED, 637 machine_mode mode ATTRIBUTE_UNUSED, 638 const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED) 639{ 640 return true; 641} 642 643int 644hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 ( 645 cumulative_args_t ca ATTRIBUTE_UNUSED, 646 machine_mode mode ATTRIBUTE_UNUSED, 647 tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED) 648{ 649 return 0; 650} 651 652void 653default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED, 654 machine_mode mode ATTRIBUTE_UNUSED, 655 const_tree type ATTRIBUTE_UNUSED, 656 bool named ATTRIBUTE_UNUSED) 657{ 658 gcc_unreachable (); 659} 660 661rtx 662default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED, 663 machine_mode mode ATTRIBUTE_UNUSED, 664 const_tree type ATTRIBUTE_UNUSED, 665 bool named ATTRIBUTE_UNUSED) 666{ 667 gcc_unreachable (); 668} 669 670rtx 671default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED, 672 machine_mode mode ATTRIBUTE_UNUSED, 673 const_tree type ATTRIBUTE_UNUSED, 674 bool named ATTRIBUTE_UNUSED) 675{ 676 gcc_unreachable (); 677} 678 679unsigned int 680default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED, 681 const_tree type ATTRIBUTE_UNUSED) 682{ 683 return PARM_BOUNDARY; 684} 685 686unsigned int 687default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED, 688 const_tree type ATTRIBUTE_UNUSED) 689{ 690 return PARM_BOUNDARY; 691} 692 693void 694hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED) 695{ 696} 697 698const char * 699hook_invalid_arg_for_unprototyped_fn ( 700 const_tree typelist ATTRIBUTE_UNUSED, 701 const_tree funcdecl ATTRIBUTE_UNUSED, 702 const_tree val ATTRIBUTE_UNUSED) 703{ 704 return NULL; 705} 706 707/* Initialize the stack protection decls. */ 708 709/* Stack protection related decls living in libgcc. */ 710static GTY(()) tree stack_chk_guard_decl; 711 712tree 713default_stack_protect_guard (void) 714{ 715 tree t = stack_chk_guard_decl; 716 717 if (t == NULL) 718 { 719 rtx x; 720 721 t = build_decl (UNKNOWN_LOCATION, 722 VAR_DECL, get_identifier ("__stack_chk_guard"), 723 ptr_type_node); 724 TREE_STATIC (t) = 1; 725 TREE_PUBLIC (t) = 1; 726 DECL_EXTERNAL (t) = 1; 727 TREE_USED (t) = 1; 728 TREE_THIS_VOLATILE (t) = 1; 729 DECL_ARTIFICIAL (t) = 1; 730 DECL_IGNORED_P (t) = 1; 731 732 /* Do not share RTL as the declaration is visible outside of 733 current function. */ 734 x = DECL_RTL (t); 735 RTX_FLAG (x, used) = 1; 736 737 stack_chk_guard_decl = t; 738 } 739 740 return t; 741} 742 743static GTY(()) tree stack_chk_fail_decl; 744 745tree 746default_external_stack_protect_fail (void) 747{ 748 tree t = stack_chk_fail_decl; 749 750 if (t == NULL_TREE) 751 { 752 t = build_function_type_list (void_type_node, NULL_TREE); 753 t = build_decl (UNKNOWN_LOCATION, 754 FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t); 755 TREE_STATIC (t) = 1; 756 TREE_PUBLIC (t) = 1; 757 DECL_EXTERNAL (t) = 1; 758 TREE_USED (t) = 1; 759 TREE_THIS_VOLATILE (t) = 1; 760 TREE_NOTHROW (t) = 1; 761 DECL_ARTIFICIAL (t) = 1; 762 DECL_IGNORED_P (t) = 1; 763 DECL_VISIBILITY (t) = VISIBILITY_DEFAULT; 764 DECL_VISIBILITY_SPECIFIED (t) = 1; 765 766 stack_chk_fail_decl = t; 767 } 768 769 return build_call_expr (t, 0); 770} 771 772tree 773default_hidden_stack_protect_fail (void) 774{ 775#ifndef HAVE_GAS_HIDDEN 776 return default_external_stack_protect_fail (); 777#else 778 tree t = stack_chk_fail_decl; 779 780 if (!flag_pic) 781 return default_external_stack_protect_fail (); 782 783 if (t == NULL_TREE) 784 { 785 t = build_function_type_list (void_type_node, NULL_TREE); 786 t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL, 787 get_identifier ("__stack_chk_fail_local"), t); 788 TREE_STATIC (t) = 1; 789 TREE_PUBLIC (t) = 1; 790 DECL_EXTERNAL (t) = 1; 791 TREE_USED (t) = 1; 792 TREE_THIS_VOLATILE (t) = 1; 793 TREE_NOTHROW (t) = 1; 794 DECL_ARTIFICIAL (t) = 1; 795 DECL_IGNORED_P (t) = 1; 796 DECL_VISIBILITY_SPECIFIED (t) = 1; 797 DECL_VISIBILITY (t) = VISIBILITY_HIDDEN; 798 799 stack_chk_fail_decl = t; 800 } 801 802 return build_call_expr (t, 0); 803#endif 804} 805 806bool 807hook_bool_const_rtx_commutative_p (const_rtx x, 808 int outer_code ATTRIBUTE_UNUSED) 809{ 810 return COMMUTATIVE_P (x); 811} 812 813rtx 814default_function_value (const_tree ret_type ATTRIBUTE_UNUSED, 815 const_tree fn_decl_or_type, 816 bool outgoing ATTRIBUTE_UNUSED) 817{ 818 /* The old interface doesn't handle receiving the function type. */ 819 if (fn_decl_or_type 820 && !DECL_P (fn_decl_or_type)) 821 fn_decl_or_type = NULL; 822 823#ifdef FUNCTION_VALUE 824 return FUNCTION_VALUE (ret_type, fn_decl_or_type); 825#else 826 gcc_unreachable (); 827#endif 828} 829 830rtx 831default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED, 832 const_rtx fun ATTRIBUTE_UNUSED) 833{ 834#ifdef LIBCALL_VALUE 835 return LIBCALL_VALUE (mode); 836#else 837 gcc_unreachable (); 838#endif 839} 840 841/* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */ 842 843bool 844default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED) 845{ 846#ifdef FUNCTION_VALUE_REGNO_P 847 return FUNCTION_VALUE_REGNO_P (regno); 848#else 849 gcc_unreachable (); 850#endif 851} 852 853rtx 854default_internal_arg_pointer (void) 855{ 856 /* If the reg that the virtual arg pointer will be translated into is 857 not a fixed reg or is the stack pointer, make a copy of the virtual 858 arg pointer, and address parms via the copy. The frame pointer is 859 considered fixed even though it is not marked as such. */ 860 if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM 861 || ! (fixed_regs[ARG_POINTER_REGNUM] 862 || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM))) 863 return copy_to_reg (virtual_incoming_args_rtx); 864 else 865 return virtual_incoming_args_rtx; 866} 867 868rtx 869default_static_chain (const_tree ARG_UNUSED (fndecl_or_type), bool incoming_p) 870{ 871 if (incoming_p) 872 { 873#ifdef STATIC_CHAIN_INCOMING_REGNUM 874 return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM); 875#endif 876 } 877 878#ifdef STATIC_CHAIN_REGNUM 879 return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM); 880#endif 881 882 { 883 static bool issued_error; 884 if (!issued_error) 885 { 886 issued_error = true; 887 sorry ("nested functions not supported on this target"); 888 } 889 890 /* It really doesn't matter what we return here, so long at it 891 doesn't cause the rest of the compiler to crash. */ 892 return gen_rtx_MEM (Pmode, stack_pointer_rtx); 893 } 894} 895 896void 897default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func), 898 rtx ARG_UNUSED (r_chain)) 899{ 900 sorry ("nested function trampolines not supported on this target"); 901} 902 903int 904default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED, 905 tree funtype ATTRIBUTE_UNUSED, 906 int size ATTRIBUTE_UNUSED) 907{ 908 return 0; 909} 910 911reg_class_t 912default_branch_target_register_class (void) 913{ 914 return NO_REGS; 915} 916 917extern bool 918default_lra_p (void) 919{ 920 return false; 921} 922 923int 924default_register_priority (int hard_regno ATTRIBUTE_UNUSED) 925{ 926 return 0; 927} 928 929extern bool 930default_register_usage_leveling_p (void) 931{ 932 return false; 933} 934 935extern bool 936default_different_addr_displacement_p (void) 937{ 938 return false; 939} 940 941reg_class_t 942default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED, 943 reg_class_t reload_class_i ATTRIBUTE_UNUSED, 944 machine_mode reload_mode ATTRIBUTE_UNUSED, 945 secondary_reload_info *sri) 946{ 947 enum reg_class rclass = NO_REGS; 948 enum reg_class reload_class = (enum reg_class) reload_class_i; 949 950 if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing) 951 { 952 sri->icode = sri->prev_sri->t_icode; 953 return NO_REGS; 954 } 955#ifdef SECONDARY_INPUT_RELOAD_CLASS 956 if (in_p) 957 rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class, reload_mode, x); 958#endif 959#ifdef SECONDARY_OUTPUT_RELOAD_CLASS 960 if (! in_p) 961 rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class, reload_mode, x); 962#endif 963 if (rclass != NO_REGS) 964 { 965 enum insn_code icode 966 = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab, 967 reload_mode); 968 969 if (icode != CODE_FOR_nothing 970 && !insn_operand_matches (icode, in_p, x)) 971 icode = CODE_FOR_nothing; 972 else if (icode != CODE_FOR_nothing) 973 { 974 const char *insn_constraint, *scratch_constraint; 975 enum reg_class insn_class, scratch_class; 976 977 gcc_assert (insn_data[(int) icode].n_operands == 3); 978 insn_constraint = insn_data[(int) icode].operand[!in_p].constraint; 979 if (!*insn_constraint) 980 insn_class = ALL_REGS; 981 else 982 { 983 if (in_p) 984 { 985 gcc_assert (*insn_constraint == '='); 986 insn_constraint++; 987 } 988 insn_class = (reg_class_for_constraint 989 (lookup_constraint (insn_constraint))); 990 gcc_assert (insn_class != NO_REGS); 991 } 992 993 scratch_constraint = insn_data[(int) icode].operand[2].constraint; 994 /* The scratch register's constraint must start with "=&", 995 except for an input reload, where only "=" is necessary, 996 and where it might be beneficial to re-use registers from 997 the input. */ 998 gcc_assert (scratch_constraint[0] == '=' 999 && (in_p || scratch_constraint[1] == '&')); 1000 scratch_constraint++; 1001 if (*scratch_constraint == '&') 1002 scratch_constraint++; 1003 scratch_class = (reg_class_for_constraint 1004 (lookup_constraint (scratch_constraint))); 1005 1006 if (reg_class_subset_p (reload_class, insn_class)) 1007 { 1008 gcc_assert (scratch_class == rclass); 1009 rclass = NO_REGS; 1010 } 1011 else 1012 rclass = insn_class; 1013 1014 } 1015 if (rclass == NO_REGS) 1016 sri->icode = icode; 1017 else 1018 sri->t_icode = icode; 1019 } 1020 return rclass; 1021} 1022 1023/* By default, if flag_pic is true, then neither local nor global relocs 1024 should be placed in readonly memory. */ 1025 1026int 1027default_reloc_rw_mask (void) 1028{ 1029 return flag_pic ? 3 : 0; 1030} 1031 1032/* By default, do no modification. */ 1033tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED, 1034 tree id) 1035{ 1036 return id; 1037} 1038 1039/* Default to natural alignment for vector types. */ 1040HOST_WIDE_INT 1041default_vector_alignment (const_tree type) 1042{ 1043 return tree_to_shwi (TYPE_SIZE (type)); 1044} 1045 1046bool 1047default_builtin_vector_alignment_reachable (const_tree type, bool is_packed) 1048{ 1049 if (is_packed) 1050 return false; 1051 1052 /* Assuming that types whose size is > pointer-size are not guaranteed to be 1053 naturally aligned. */ 1054 if (tree_int_cst_compare (TYPE_SIZE (type), bitsize_int (POINTER_SIZE)) > 0) 1055 return false; 1056 1057 /* Assuming that types whose size is <= pointer-size 1058 are naturally aligned. */ 1059 return true; 1060} 1061 1062/* By default, assume that a target supports any factor of misalignment 1063 memory access if it supports movmisalign patten. 1064 is_packed is true if the memory access is defined in a packed struct. */ 1065bool 1066default_builtin_support_vector_misalignment (machine_mode mode, 1067 const_tree type 1068 ATTRIBUTE_UNUSED, 1069 int misalignment 1070 ATTRIBUTE_UNUSED, 1071 bool is_packed 1072 ATTRIBUTE_UNUSED) 1073{ 1074 if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing) 1075 return true; 1076 return false; 1077} 1078 1079/* By default, only attempt to parallelize bitwise operations, and 1080 possibly adds/subtracts using bit-twiddling. */ 1081 1082machine_mode 1083default_preferred_simd_mode (machine_mode mode ATTRIBUTE_UNUSED) 1084{ 1085 return word_mode; 1086} 1087 1088/* By default only the size derived from the preferred vector mode 1089 is tried. */ 1090 1091unsigned int 1092default_autovectorize_vector_sizes (void) 1093{ 1094 return 0; 1095} 1096 1097/* By default, the cost model accumulates three separate costs (prologue, 1098 loop body, and epilogue) for a vectorized loop or block. So allocate an 1099 array of three unsigned ints, set it to zero, and return its address. */ 1100 1101void * 1102default_init_cost (struct loop *loop_info ATTRIBUTE_UNUSED) 1103{ 1104 unsigned *cost = XNEWVEC (unsigned, 3); 1105 cost[vect_prologue] = cost[vect_body] = cost[vect_epilogue] = 0; 1106 return cost; 1107} 1108 1109/* By default, the cost model looks up the cost of the given statement 1110 kind and mode, multiplies it by the occurrence count, accumulates 1111 it into the cost specified by WHERE, and returns the cost added. */ 1112 1113unsigned 1114default_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind, 1115 struct _stmt_vec_info *stmt_info, int misalign, 1116 enum vect_cost_model_location where) 1117{ 1118 unsigned *cost = (unsigned *) data; 1119 unsigned retval = 0; 1120 1121 tree vectype = stmt_info ? stmt_vectype (stmt_info) : NULL_TREE; 1122 int stmt_cost = targetm.vectorize.builtin_vectorization_cost (kind, vectype, 1123 misalign); 1124 /* Statements in an inner loop relative to the loop being 1125 vectorized are weighted more heavily. The value here is 1126 arbitrary and could potentially be improved with analysis. */ 1127 if (where == vect_body && stmt_info && stmt_in_inner_loop_p (stmt_info)) 1128 count *= 50; /* FIXME. */ 1129 1130 retval = (unsigned) (count * stmt_cost); 1131 cost[where] += retval; 1132 1133 return retval; 1134} 1135 1136/* By default, the cost model just returns the accumulated costs. */ 1137 1138void 1139default_finish_cost (void *data, unsigned *prologue_cost, 1140 unsigned *body_cost, unsigned *epilogue_cost) 1141{ 1142 unsigned *cost = (unsigned *) data; 1143 *prologue_cost = cost[vect_prologue]; 1144 *body_cost = cost[vect_body]; 1145 *epilogue_cost = cost[vect_epilogue]; 1146} 1147 1148/* Free the cost data. */ 1149 1150void 1151default_destroy_cost_data (void *data) 1152{ 1153 free (data); 1154} 1155 1156/* Determine whether or not a pointer mode is valid. Assume defaults 1157 of ptr_mode or Pmode - can be overridden. */ 1158bool 1159default_valid_pointer_mode (machine_mode mode) 1160{ 1161 return (mode == ptr_mode || mode == Pmode); 1162} 1163 1164/* Determine whether the memory reference specified by REF may alias 1165 the C libraries errno location. */ 1166bool 1167default_ref_may_alias_errno (ao_ref *ref) 1168{ 1169 tree base = ao_ref_base (ref); 1170 /* The default implementation assumes the errno location is 1171 a declaration of type int or is always accessed via a 1172 pointer to int. We assume that accesses to errno are 1173 not deliberately obfuscated (even in conforming ways). */ 1174 if (TYPE_UNSIGNED (TREE_TYPE (base)) 1175 || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node)) 1176 return false; 1177 /* The default implementation assumes an errno location 1178 declaration is never defined in the current compilation unit. */ 1179 if (DECL_P (base) 1180 && !TREE_STATIC (base)) 1181 return true; 1182 else if (TREE_CODE (base) == MEM_REF 1183 && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME) 1184 { 1185 struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0)); 1186 return !pi || pi->pt.anything || pi->pt.nonlocal; 1187 } 1188 return false; 1189} 1190 1191/* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode 1192 for the generic address space only. */ 1193 1194machine_mode 1195default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED) 1196{ 1197 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace)); 1198 return ptr_mode; 1199} 1200 1201/* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode 1202 for the generic address space only. */ 1203 1204machine_mode 1205default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED) 1206{ 1207 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace)); 1208 return Pmode; 1209} 1210 1211/* Named address space version of valid_pointer_mode. */ 1212 1213bool 1214default_addr_space_valid_pointer_mode (machine_mode mode, addr_space_t as) 1215{ 1216 if (!ADDR_SPACE_GENERIC_P (as)) 1217 return (mode == targetm.addr_space.pointer_mode (as) 1218 || mode == targetm.addr_space.address_mode (as)); 1219 1220 return targetm.valid_pointer_mode (mode); 1221} 1222 1223/* Some places still assume that all pointer or address modes are the 1224 standard Pmode and ptr_mode. These optimizations become invalid if 1225 the target actually supports multiple different modes. For now, 1226 we disable such optimizations on such targets, using this function. */ 1227 1228bool 1229target_default_pointer_address_modes_p (void) 1230{ 1231 if (targetm.addr_space.address_mode != default_addr_space_address_mode) 1232 return false; 1233 if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode) 1234 return false; 1235 1236 return true; 1237} 1238 1239/* Named address space version of legitimate_address_p. */ 1240 1241bool 1242default_addr_space_legitimate_address_p (machine_mode mode, rtx mem, 1243 bool strict, addr_space_t as) 1244{ 1245 if (!ADDR_SPACE_GENERIC_P (as)) 1246 gcc_unreachable (); 1247 1248 return targetm.legitimate_address_p (mode, mem, strict); 1249} 1250 1251/* Named address space version of LEGITIMIZE_ADDRESS. */ 1252 1253rtx 1254default_addr_space_legitimize_address (rtx x, rtx oldx, 1255 machine_mode mode, addr_space_t as) 1256{ 1257 if (!ADDR_SPACE_GENERIC_P (as)) 1258 return x; 1259 1260 return targetm.legitimize_address (x, oldx, mode); 1261} 1262 1263/* The default hook for determining if one named address space is a subset of 1264 another and to return which address space to use as the common address 1265 space. */ 1266 1267bool 1268default_addr_space_subset_p (addr_space_t subset, addr_space_t superset) 1269{ 1270 return (subset == superset); 1271} 1272 1273/* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be 1274 called for targets with only a generic address space. */ 1275 1276rtx 1277default_addr_space_convert (rtx op ATTRIBUTE_UNUSED, 1278 tree from_type ATTRIBUTE_UNUSED, 1279 tree to_type ATTRIBUTE_UNUSED) 1280{ 1281 gcc_unreachable (); 1282} 1283 1284bool 1285default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED) 1286{ 1287 return true; 1288} 1289 1290/* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */ 1291 1292bool 1293default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED, 1294 addr_space_t addrspace ATTRIBUTE_UNUSED) 1295{ 1296 return false; 1297} 1298 1299bool 1300default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl), 1301 tree ARG_UNUSED (name), 1302 tree ARG_UNUSED (args), 1303 int ARG_UNUSED (flags)) 1304{ 1305 warning (OPT_Wattributes, 1306 "target attribute is not supported on this machine"); 1307 1308 return false; 1309} 1310 1311bool 1312default_target_option_pragma_parse (tree ARG_UNUSED (args), 1313 tree ARG_UNUSED (pop_target)) 1314{ 1315 /* If args is NULL the caller is handle_pragma_pop_options (). In that case, 1316 emit no warning because "#pragma GCC pop_target" is valid on targets that 1317 do not have the "target" pragma. */ 1318 if (args) 1319 warning (OPT_Wpragmas, 1320 "#pragma GCC target is not supported for this machine"); 1321 1322 return false; 1323} 1324 1325bool 1326default_target_can_inline_p (tree caller, tree callee) 1327{ 1328 bool ret = false; 1329 tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee); 1330 tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller); 1331 1332 /* If callee has no option attributes, then it is ok to inline */ 1333 if (!callee_opts) 1334 ret = true; 1335 1336 /* If caller has no option attributes, but callee does then it is not ok to 1337 inline */ 1338 else if (!caller_opts) 1339 ret = false; 1340 1341 /* If both caller and callee have attributes, assume that if the 1342 pointer is different, the two functions have different target 1343 options since build_target_option_node uses a hash table for the 1344 options. */ 1345 else 1346 ret = (callee_opts == caller_opts); 1347 1348 return ret; 1349} 1350 1351#ifndef HAVE_casesi 1352# define HAVE_casesi 0 1353#endif 1354 1355/* If the machine does not have a case insn that compares the bounds, 1356 this means extra overhead for dispatch tables, which raises the 1357 threshold for using them. */ 1358 1359unsigned int 1360default_case_values_threshold (void) 1361{ 1362 return (HAVE_casesi ? 4 : 5); 1363} 1364 1365bool 1366default_have_conditional_execution (void) 1367{ 1368#ifdef HAVE_conditional_execution 1369 return HAVE_conditional_execution; 1370#else 1371 return false; 1372#endif 1373} 1374 1375/* By default we assume that c99 functions are present at the runtime, 1376 but sincos is not. */ 1377bool 1378default_libc_has_function (enum function_class fn_class) 1379{ 1380 if (fn_class == function_c94 1381 || fn_class == function_c99_misc 1382 || fn_class == function_c99_math_complex) 1383 return true; 1384 1385 return false; 1386} 1387 1388bool 1389gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED) 1390{ 1391 return true; 1392} 1393 1394bool 1395no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED) 1396{ 1397 return false; 1398} 1399 1400tree 1401default_builtin_tm_load_store (tree ARG_UNUSED (type)) 1402{ 1403 return NULL_TREE; 1404} 1405 1406/* Compute cost of moving registers to/from memory. */ 1407 1408int 1409default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED, 1410 reg_class_t rclass ATTRIBUTE_UNUSED, 1411 bool in ATTRIBUTE_UNUSED) 1412{ 1413#ifndef MEMORY_MOVE_COST 1414 return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in)); 1415#else 1416 return MEMORY_MOVE_COST (mode, (enum reg_class) rclass, in); 1417#endif 1418} 1419 1420/* Compute cost of moving data from a register of class FROM to one of 1421 TO, using MODE. */ 1422 1423int 1424default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED, 1425 reg_class_t from ATTRIBUTE_UNUSED, 1426 reg_class_t to ATTRIBUTE_UNUSED) 1427{ 1428#ifndef REGISTER_MOVE_COST 1429 return 2; 1430#else 1431 return REGISTER_MOVE_COST (mode, (enum reg_class) from, (enum reg_class) to); 1432#endif 1433} 1434 1435/* For hooks which use the MOVE_RATIO macro, this gives the legacy default 1436 behaviour. SPEED_P is true if we are compiling for speed. */ 1437 1438unsigned int 1439get_move_ratio (bool speed_p ATTRIBUTE_UNUSED) 1440{ 1441 unsigned int move_ratio; 1442#ifdef MOVE_RATIO 1443 move_ratio = (unsigned int) MOVE_RATIO (speed_p); 1444#else 1445#if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti) 1446 move_ratio = 2; 1447#else /* No movmem patterns, pick a default. */ 1448 move_ratio = ((speed_p) ? 15 : 3); 1449#endif 1450#endif 1451 return move_ratio; 1452} 1453 1454/* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be 1455 used; return FALSE if the movmem/setmem optab should be expanded, or 1456 a call to memcpy emitted. */ 1457 1458bool 1459default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size, 1460 unsigned int alignment, 1461 enum by_pieces_operation op, 1462 bool speed_p) 1463{ 1464 unsigned int max_size = 0; 1465 unsigned int ratio = 0; 1466 1467 switch (op) 1468 { 1469 case CLEAR_BY_PIECES: 1470 max_size = STORE_MAX_PIECES; 1471 ratio = CLEAR_RATIO (speed_p); 1472 break; 1473 case MOVE_BY_PIECES: 1474 max_size = MOVE_MAX_PIECES; 1475 ratio = get_move_ratio (speed_p); 1476 break; 1477 case SET_BY_PIECES: 1478 max_size = STORE_MAX_PIECES; 1479 ratio = SET_RATIO (speed_p); 1480 break; 1481 case STORE_BY_PIECES: 1482 max_size = STORE_MAX_PIECES; 1483 ratio = get_move_ratio (speed_p); 1484 break; 1485 } 1486 1487 return move_by_pieces_ninsns (size, alignment, max_size + 1) < ratio; 1488} 1489 1490bool 1491default_profile_before_prologue (void) 1492{ 1493#ifdef PROFILE_BEFORE_PROLOGUE 1494 return true; 1495#else 1496 return false; 1497#endif 1498} 1499 1500/* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */ 1501 1502reg_class_t 1503default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED, 1504 reg_class_t rclass) 1505{ 1506#ifdef PREFERRED_RELOAD_CLASS 1507 return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass); 1508#else 1509 return rclass; 1510#endif 1511} 1512 1513/* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */ 1514 1515reg_class_t 1516default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED, 1517 reg_class_t rclass) 1518{ 1519 return rclass; 1520} 1521 1522/* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */ 1523reg_class_t 1524default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED) 1525{ 1526 return NO_REGS; 1527} 1528 1529/* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */ 1530 1531bool 1532default_class_likely_spilled_p (reg_class_t rclass) 1533{ 1534 return (reg_class_size[(int) rclass] == 1); 1535} 1536 1537/* The default implementation of TARGET_CLASS_MAX_NREGS. */ 1538 1539unsigned char 1540default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED, 1541 machine_mode mode ATTRIBUTE_UNUSED) 1542{ 1543#ifdef CLASS_MAX_NREGS 1544 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class) rclass, mode); 1545#else 1546 return ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD); 1547#endif 1548} 1549 1550/* Determine the debugging unwind mechanism for the target. */ 1551 1552enum unwind_info_type 1553default_debug_unwind_info (void) 1554{ 1555 /* If the target wants to force the use of dwarf2 unwind info, let it. */ 1556 /* ??? Change all users to the hook, then poison this. */ 1557#ifdef DWARF2_FRAME_INFO 1558 if (DWARF2_FRAME_INFO) 1559 return UI_DWARF2; 1560#endif 1561 1562 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */ 1563#ifdef DWARF2_DEBUGGING_INFO 1564 if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG) 1565 return UI_DWARF2; 1566#endif 1567 1568 return UI_NONE; 1569} 1570 1571/* Determine the correct mode for a Dwarf frame register that represents 1572 register REGNO. */ 1573 1574machine_mode 1575default_dwarf_frame_reg_mode (int regno) 1576{ 1577 machine_mode save_mode = reg_raw_mode[regno]; 1578 1579 if (HARD_REGNO_CALL_PART_CLOBBERED (regno, save_mode)) 1580 save_mode = choose_hard_reg_mode (regno, 1, true); 1581 return save_mode; 1582} 1583 1584/* To be used by targets where reg_raw_mode doesn't return the right 1585 mode for registers used in apply_builtin_return and apply_builtin_arg. */ 1586 1587machine_mode 1588default_get_reg_raw_mode (int regno) 1589{ 1590 return reg_raw_mode[regno]; 1591} 1592 1593/* Return true if a leaf function should stay leaf even with profiling 1594 enabled. */ 1595 1596bool 1597default_keep_leaf_when_profiled () 1598{ 1599 return false; 1600} 1601 1602/* Return true if the state of option OPTION should be stored in PCH files 1603 and checked by default_pch_valid_p. Store the option's current state 1604 in STATE if so. */ 1605 1606static inline bool 1607option_affects_pch_p (int option, struct cl_option_state *state) 1608{ 1609 if ((cl_options[option].flags & CL_TARGET) == 0) 1610 return false; 1611 if ((cl_options[option].flags & CL_PCH_IGNORE) != 0) 1612 return false; 1613 if (option_flag_var (option, &global_options) == &target_flags) 1614 if (targetm.check_pch_target_flags) 1615 return false; 1616 return get_option_state (&global_options, option, state); 1617} 1618 1619/* Default version of get_pch_validity. 1620 By default, every flag difference is fatal; that will be mostly right for 1621 most targets, but completely right for very few. */ 1622 1623void * 1624default_get_pch_validity (size_t *sz) 1625{ 1626 struct cl_option_state state; 1627 size_t i; 1628 char *result, *r; 1629 1630 *sz = 2; 1631 if (targetm.check_pch_target_flags) 1632 *sz += sizeof (target_flags); 1633 for (i = 0; i < cl_options_count; i++) 1634 if (option_affects_pch_p (i, &state)) 1635 *sz += state.size; 1636 1637 result = r = XNEWVEC (char, *sz); 1638 r[0] = flag_pic; 1639 r[1] = flag_pie; 1640 r += 2; 1641 if (targetm.check_pch_target_flags) 1642 { 1643 memcpy (r, &target_flags, sizeof (target_flags)); 1644 r += sizeof (target_flags); 1645 } 1646 1647 for (i = 0; i < cl_options_count; i++) 1648 if (option_affects_pch_p (i, &state)) 1649 { 1650 memcpy (r, state.data, state.size); 1651 r += state.size; 1652 } 1653 1654 return result; 1655} 1656 1657/* Return a message which says that a PCH file was created with a different 1658 setting of OPTION. */ 1659 1660static const char * 1661pch_option_mismatch (const char *option) 1662{ 1663 return xasprintf (_("created and used with differing settings of '%s'"), 1664 option); 1665} 1666 1667/* Default version of pch_valid_p. */ 1668 1669const char * 1670default_pch_valid_p (const void *data_p, size_t len) 1671{ 1672 struct cl_option_state state; 1673 const char *data = (const char *)data_p; 1674 size_t i; 1675 1676 /* -fpic and -fpie also usually make a PCH invalid. */ 1677 if (data[0] != flag_pic) 1678 return _("created and used with different settings of -fpic"); 1679 if (data[1] != flag_pie) 1680 return _("created and used with different settings of -fpie"); 1681 data += 2; 1682 1683 /* Check target_flags. */ 1684 if (targetm.check_pch_target_flags) 1685 { 1686 int tf; 1687 const char *r; 1688 1689 memcpy (&tf, data, sizeof (target_flags)); 1690 data += sizeof (target_flags); 1691 len -= sizeof (target_flags); 1692 r = targetm.check_pch_target_flags (tf); 1693 if (r != NULL) 1694 return r; 1695 } 1696 1697 for (i = 0; i < cl_options_count; i++) 1698 if (option_affects_pch_p (i, &state)) 1699 { 1700 if (memcmp (data, state.data, state.size) != 0) 1701 return pch_option_mismatch (cl_options[i].opt_text); 1702 data += state.size; 1703 len -= state.size; 1704 } 1705 1706 return NULL; 1707} 1708 1709/* Default version of cstore_mode. */ 1710 1711machine_mode 1712default_cstore_mode (enum insn_code icode) 1713{ 1714 return insn_data[(int) icode].operand[0].mode; 1715} 1716 1717/* Default version of member_type_forces_blk. */ 1718 1719bool 1720default_member_type_forces_blk (const_tree, machine_mode) 1721{ 1722 return false; 1723} 1724 1725rtx 1726default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED, 1727 rtx ptr ATTRIBUTE_UNUSED, 1728 rtx bnd ATTRIBUTE_UNUSED) 1729{ 1730 gcc_unreachable (); 1731} 1732 1733void 1734default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED, 1735 rtx addr ATTRIBUTE_UNUSED, 1736 rtx bounds ATTRIBUTE_UNUSED, 1737 rtx to ATTRIBUTE_UNUSED) 1738{ 1739 gcc_unreachable (); 1740} 1741 1742rtx 1743default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED) 1744{ 1745 gcc_unreachable (); 1746} 1747 1748void 1749default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED, 1750 rtx bounds ATTRIBUTE_UNUSED) 1751{ 1752 gcc_unreachable (); 1753} 1754 1755/* Default version of canonicalize_comparison. */ 1756 1757void 1758default_canonicalize_comparison (int *, rtx *, rtx *, bool) 1759{ 1760} 1761 1762/* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */ 1763 1764void 1765default_atomic_assign_expand_fenv (tree *, tree *, tree *) 1766{ 1767} 1768 1769#ifndef PAD_VARARGS_DOWN 1770#define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN 1771#endif 1772 1773/* Build an indirect-ref expression over the given TREE, which represents a 1774 piece of a va_arg() expansion. */ 1775tree 1776build_va_arg_indirect_ref (tree addr) 1777{ 1778 addr = build_simple_mem_ref_loc (EXPR_LOCATION (addr), addr); 1779 return addr; 1780} 1781 1782/* The "standard" implementation of va_arg: read the value from the 1783 current (padded) address and increment by the (padded) size. */ 1784 1785tree 1786std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p, 1787 gimple_seq *post_p) 1788{ 1789 tree addr, t, type_size, rounded_size, valist_tmp; 1790 unsigned HOST_WIDE_INT align, boundary; 1791 bool indirect; 1792 1793#ifdef ARGS_GROW_DOWNWARD 1794 /* All of the alignment and movement below is for args-grow-up machines. 1795 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all 1796 implement their own specialized gimplify_va_arg_expr routines. */ 1797 gcc_unreachable (); 1798#endif 1799 1800 indirect = pass_by_reference (NULL, TYPE_MODE (type), type, false); 1801 if (indirect) 1802 type = build_pointer_type (type); 1803 1804 align = PARM_BOUNDARY / BITS_PER_UNIT; 1805 boundary = targetm.calls.function_arg_boundary (TYPE_MODE (type), type); 1806 1807 /* When we align parameter on stack for caller, if the parameter 1808 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be 1809 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee 1810 here with caller. */ 1811 if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT) 1812 boundary = MAX_SUPPORTED_STACK_ALIGNMENT; 1813 1814 boundary /= BITS_PER_UNIT; 1815 1816 /* Hoist the valist value into a temporary for the moment. */ 1817 valist_tmp = get_initialized_tmp_var (valist, pre_p, NULL); 1818 1819 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually 1820 requires greater alignment, we must perform dynamic alignment. */ 1821 if (boundary > align 1822 && !integer_zerop (TYPE_SIZE (type))) 1823 { 1824 t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp, 1825 fold_build_pointer_plus_hwi (valist_tmp, boundary - 1)); 1826 gimplify_and_add (t, pre_p); 1827 1828 t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp, 1829 fold_build2 (BIT_AND_EXPR, TREE_TYPE (valist), 1830 valist_tmp, 1831 build_int_cst (TREE_TYPE (valist), -boundary))); 1832 gimplify_and_add (t, pre_p); 1833 } 1834 else 1835 boundary = align; 1836 1837 /* If the actual alignment is less than the alignment of the type, 1838 adjust the type accordingly so that we don't assume strict alignment 1839 when dereferencing the pointer. */ 1840 boundary *= BITS_PER_UNIT; 1841 if (boundary < TYPE_ALIGN (type)) 1842 { 1843 type = build_variant_type_copy (type); 1844 TYPE_ALIGN (type) = boundary; 1845 } 1846 1847 /* Compute the rounded size of the type. */ 1848 type_size = size_in_bytes (type); 1849 rounded_size = round_up (type_size, align); 1850 1851 /* Reduce rounded_size so it's sharable with the postqueue. */ 1852 gimplify_expr (&rounded_size, pre_p, post_p, is_gimple_val, fb_rvalue); 1853 1854 /* Get AP. */ 1855 addr = valist_tmp; 1856 if (PAD_VARARGS_DOWN && !integer_zerop (rounded_size)) 1857 { 1858 /* Small args are padded downward. */ 1859 t = fold_build2_loc (input_location, GT_EXPR, sizetype, 1860 rounded_size, size_int (align)); 1861 t = fold_build3 (COND_EXPR, sizetype, t, size_zero_node, 1862 size_binop (MINUS_EXPR, rounded_size, type_size)); 1863 addr = fold_build_pointer_plus (addr, t); 1864 } 1865 1866 /* Compute new value for AP. */ 1867 t = fold_build_pointer_plus (valist_tmp, rounded_size); 1868 t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist, t); 1869 gimplify_and_add (t, pre_p); 1870 1871 addr = fold_convert (build_pointer_type (type), addr); 1872 1873 if (indirect) 1874 addr = build_va_arg_indirect_ref (addr); 1875 1876 return build_va_arg_indirect_ref (addr); 1877} 1878 1879tree 1880default_chkp_bound_type (void) 1881{ 1882 tree res = make_node (POINTER_BOUNDS_TYPE); 1883 TYPE_PRECISION (res) = TYPE_PRECISION (size_type_node) * 2; 1884 TYPE_NAME (res) = get_identifier ("__bounds_type"); 1885 SET_TYPE_MODE (res, targetm.chkp_bound_mode ()); 1886 layout_type (res); 1887 return res; 1888} 1889 1890enum machine_mode 1891default_chkp_bound_mode (void) 1892{ 1893 return VOIDmode; 1894} 1895 1896tree 1897default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED) 1898{ 1899 return NULL_TREE; 1900} 1901 1902rtx 1903default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED, 1904 const_tree fn_decl_or_type ATTRIBUTE_UNUSED, 1905 bool outgoing ATTRIBUTE_UNUSED) 1906{ 1907 gcc_unreachable (); 1908} 1909 1910tree 1911default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED, 1912 HOST_WIDE_INT ub ATTRIBUTE_UNUSED) 1913{ 1914 return NULL_TREE; 1915} 1916 1917int 1918default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED, 1919 tree lb ATTRIBUTE_UNUSED, 1920 tree ub ATTRIBUTE_UNUSED, 1921 tree *stmts ATTRIBUTE_UNUSED) 1922{ 1923 return 0; 1924} 1925 1926void 1927default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED, 1928 enum machine_mode mode ATTRIBUTE_UNUSED, 1929 tree type ATTRIBUTE_UNUSED, 1930 int *pretend_arg_size ATTRIBUTE_UNUSED, 1931 int second_time ATTRIBUTE_UNUSED) 1932{ 1933} 1934 1935/* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do 1936 not support nested low-overhead loops. */ 1937 1938bool 1939can_use_doloop_if_innermost (const widest_int &, const widest_int &, 1940 unsigned int loop_depth, bool) 1941{ 1942 return loop_depth == 1; 1943} 1944 1945#include "gt-targhooks.h" 1946