targhooks.c revision 1.5
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#if 1 798 /* 799 * This is a hack: 800 * It appears that our gas does not generate @PLT for hidden 801 * symbols. It could be that we need a newer version, or that 802 * this local function is handled differently on linux. 803 */ 804 DECL_VISIBILITY (t) = VISIBILITY_DEFAULT; 805#else 806 DECL_VISIBILITY (t) = VISIBILITY_HIDDEN; 807#endif 808 809 stack_chk_fail_decl = t; 810 } 811 812 return build_call_expr (t, 0); 813#endif 814} 815 816bool 817hook_bool_const_rtx_commutative_p (const_rtx x, 818 int outer_code ATTRIBUTE_UNUSED) 819{ 820 return COMMUTATIVE_P (x); 821} 822 823rtx 824default_function_value (const_tree ret_type ATTRIBUTE_UNUSED, 825 const_tree fn_decl_or_type, 826 bool outgoing ATTRIBUTE_UNUSED) 827{ 828 /* The old interface doesn't handle receiving the function type. */ 829 if (fn_decl_or_type 830 && !DECL_P (fn_decl_or_type)) 831 fn_decl_or_type = NULL; 832 833#ifdef FUNCTION_VALUE 834 return FUNCTION_VALUE (ret_type, fn_decl_or_type); 835#else 836 gcc_unreachable (); 837#endif 838} 839 840rtx 841default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED, 842 const_rtx fun ATTRIBUTE_UNUSED) 843{ 844#ifdef LIBCALL_VALUE 845 return LIBCALL_VALUE (mode); 846#else 847 gcc_unreachable (); 848#endif 849} 850 851/* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */ 852 853bool 854default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED) 855{ 856#ifdef FUNCTION_VALUE_REGNO_P 857 return FUNCTION_VALUE_REGNO_P (regno); 858#else 859 gcc_unreachable (); 860#endif 861} 862 863rtx 864default_internal_arg_pointer (void) 865{ 866 /* If the reg that the virtual arg pointer will be translated into is 867 not a fixed reg or is the stack pointer, make a copy of the virtual 868 arg pointer, and address parms via the copy. The frame pointer is 869 considered fixed even though it is not marked as such. */ 870 if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM 871 || ! (fixed_regs[ARG_POINTER_REGNUM] 872 || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM))) 873 return copy_to_reg (virtual_incoming_args_rtx); 874 else 875 return virtual_incoming_args_rtx; 876} 877 878rtx 879default_static_chain (const_tree ARG_UNUSED (fndecl_or_type), bool incoming_p) 880{ 881 if (incoming_p) 882 { 883#ifdef STATIC_CHAIN_INCOMING_REGNUM 884 return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM); 885#endif 886 } 887 888#ifdef STATIC_CHAIN_REGNUM 889 return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM); 890#endif 891 892 { 893 static bool issued_error; 894 if (!issued_error) 895 { 896 issued_error = true; 897 sorry ("nested functions not supported on this target"); 898 } 899 900 /* It really doesn't matter what we return here, so long at it 901 doesn't cause the rest of the compiler to crash. */ 902 return gen_rtx_MEM (Pmode, stack_pointer_rtx); 903 } 904} 905 906void 907default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func), 908 rtx ARG_UNUSED (r_chain)) 909{ 910 sorry ("nested function trampolines not supported on this target"); 911} 912 913int 914default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED, 915 tree funtype ATTRIBUTE_UNUSED, 916 int size ATTRIBUTE_UNUSED) 917{ 918 return 0; 919} 920 921reg_class_t 922default_branch_target_register_class (void) 923{ 924 return NO_REGS; 925} 926 927extern bool 928default_lra_p (void) 929{ 930 return false; 931} 932 933int 934default_register_priority (int hard_regno ATTRIBUTE_UNUSED) 935{ 936 return 0; 937} 938 939extern bool 940default_register_usage_leveling_p (void) 941{ 942 return false; 943} 944 945extern bool 946default_different_addr_displacement_p (void) 947{ 948 return false; 949} 950 951reg_class_t 952default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED, 953 reg_class_t reload_class_i ATTRIBUTE_UNUSED, 954 machine_mode reload_mode ATTRIBUTE_UNUSED, 955 secondary_reload_info *sri) 956{ 957 enum reg_class rclass = NO_REGS; 958 enum reg_class reload_class = (enum reg_class) reload_class_i; 959 960 if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing) 961 { 962 sri->icode = sri->prev_sri->t_icode; 963 return NO_REGS; 964 } 965#ifdef SECONDARY_INPUT_RELOAD_CLASS 966 if (in_p) 967 rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class, reload_mode, x); 968#endif 969#ifdef SECONDARY_OUTPUT_RELOAD_CLASS 970 if (! in_p) 971 rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class, reload_mode, x); 972#endif 973 if (rclass != NO_REGS) 974 { 975 enum insn_code icode 976 = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab, 977 reload_mode); 978 979 if (icode != CODE_FOR_nothing 980 && !insn_operand_matches (icode, in_p, x)) 981 icode = CODE_FOR_nothing; 982 else if (icode != CODE_FOR_nothing) 983 { 984 const char *insn_constraint, *scratch_constraint; 985 enum reg_class insn_class, scratch_class; 986 987 gcc_assert (insn_data[(int) icode].n_operands == 3); 988 insn_constraint = insn_data[(int) icode].operand[!in_p].constraint; 989 if (!*insn_constraint) 990 insn_class = ALL_REGS; 991 else 992 { 993 if (in_p) 994 { 995 gcc_assert (*insn_constraint == '='); 996 insn_constraint++; 997 } 998 insn_class = (reg_class_for_constraint 999 (lookup_constraint (insn_constraint))); 1000 gcc_assert (insn_class != NO_REGS); 1001 } 1002 1003 scratch_constraint = insn_data[(int) icode].operand[2].constraint; 1004 /* The scratch register's constraint must start with "=&", 1005 except for an input reload, where only "=" is necessary, 1006 and where it might be beneficial to re-use registers from 1007 the input. */ 1008 gcc_assert (scratch_constraint[0] == '=' 1009 && (in_p || scratch_constraint[1] == '&')); 1010 scratch_constraint++; 1011 if (*scratch_constraint == '&') 1012 scratch_constraint++; 1013 scratch_class = (reg_class_for_constraint 1014 (lookup_constraint (scratch_constraint))); 1015 1016 if (reg_class_subset_p (reload_class, insn_class)) 1017 { 1018 gcc_assert (scratch_class == rclass); 1019 rclass = NO_REGS; 1020 } 1021 else 1022 rclass = insn_class; 1023 1024 } 1025 if (rclass == NO_REGS) 1026 sri->icode = icode; 1027 else 1028 sri->t_icode = icode; 1029 } 1030 return rclass; 1031} 1032 1033/* By default, if flag_pic is true, then neither local nor global relocs 1034 should be placed in readonly memory. */ 1035 1036int 1037default_reloc_rw_mask (void) 1038{ 1039 return flag_pic ? 3 : 0; 1040} 1041 1042/* By default, do no modification. */ 1043tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED, 1044 tree id) 1045{ 1046 return id; 1047} 1048 1049/* Default to natural alignment for vector types. */ 1050HOST_WIDE_INT 1051default_vector_alignment (const_tree type) 1052{ 1053 return tree_to_shwi (TYPE_SIZE (type)); 1054} 1055 1056bool 1057default_builtin_vector_alignment_reachable (const_tree type, bool is_packed) 1058{ 1059 if (is_packed) 1060 return false; 1061 1062 /* Assuming that types whose size is > pointer-size are not guaranteed to be 1063 naturally aligned. */ 1064 if (tree_int_cst_compare (TYPE_SIZE (type), bitsize_int (POINTER_SIZE)) > 0) 1065 return false; 1066 1067 /* Assuming that types whose size is <= pointer-size 1068 are naturally aligned. */ 1069 return true; 1070} 1071 1072/* By default, assume that a target supports any factor of misalignment 1073 memory access if it supports movmisalign patten. 1074 is_packed is true if the memory access is defined in a packed struct. */ 1075bool 1076default_builtin_support_vector_misalignment (machine_mode mode, 1077 const_tree type 1078 ATTRIBUTE_UNUSED, 1079 int misalignment 1080 ATTRIBUTE_UNUSED, 1081 bool is_packed 1082 ATTRIBUTE_UNUSED) 1083{ 1084 if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing) 1085 return true; 1086 return false; 1087} 1088 1089/* By default, only attempt to parallelize bitwise operations, and 1090 possibly adds/subtracts using bit-twiddling. */ 1091 1092machine_mode 1093default_preferred_simd_mode (machine_mode mode ATTRIBUTE_UNUSED) 1094{ 1095 return word_mode; 1096} 1097 1098/* By default only the size derived from the preferred vector mode 1099 is tried. */ 1100 1101unsigned int 1102default_autovectorize_vector_sizes (void) 1103{ 1104 return 0; 1105} 1106 1107/* By default, the cost model accumulates three separate costs (prologue, 1108 loop body, and epilogue) for a vectorized loop or block. So allocate an 1109 array of three unsigned ints, set it to zero, and return its address. */ 1110 1111void * 1112default_init_cost (struct loop *loop_info ATTRIBUTE_UNUSED) 1113{ 1114 unsigned *cost = XNEWVEC (unsigned, 3); 1115 cost[vect_prologue] = cost[vect_body] = cost[vect_epilogue] = 0; 1116 return cost; 1117} 1118 1119/* By default, the cost model looks up the cost of the given statement 1120 kind and mode, multiplies it by the occurrence count, accumulates 1121 it into the cost specified by WHERE, and returns the cost added. */ 1122 1123unsigned 1124default_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind, 1125 struct _stmt_vec_info *stmt_info, int misalign, 1126 enum vect_cost_model_location where) 1127{ 1128 unsigned *cost = (unsigned *) data; 1129 unsigned retval = 0; 1130 1131 tree vectype = stmt_info ? stmt_vectype (stmt_info) : NULL_TREE; 1132 int stmt_cost = targetm.vectorize.builtin_vectorization_cost (kind, vectype, 1133 misalign); 1134 /* Statements in an inner loop relative to the loop being 1135 vectorized are weighted more heavily. The value here is 1136 arbitrary and could potentially be improved with analysis. */ 1137 if (where == vect_body && stmt_info && stmt_in_inner_loop_p (stmt_info)) 1138 count *= 50; /* FIXME. */ 1139 1140 retval = (unsigned) (count * stmt_cost); 1141 cost[where] += retval; 1142 1143 return retval; 1144} 1145 1146/* By default, the cost model just returns the accumulated costs. */ 1147 1148void 1149default_finish_cost (void *data, unsigned *prologue_cost, 1150 unsigned *body_cost, unsigned *epilogue_cost) 1151{ 1152 unsigned *cost = (unsigned *) data; 1153 *prologue_cost = cost[vect_prologue]; 1154 *body_cost = cost[vect_body]; 1155 *epilogue_cost = cost[vect_epilogue]; 1156} 1157 1158/* Free the cost data. */ 1159 1160void 1161default_destroy_cost_data (void *data) 1162{ 1163 free (data); 1164} 1165 1166/* Determine whether or not a pointer mode is valid. Assume defaults 1167 of ptr_mode or Pmode - can be overridden. */ 1168bool 1169default_valid_pointer_mode (machine_mode mode) 1170{ 1171 return (mode == ptr_mode || mode == Pmode); 1172} 1173 1174/* Determine whether the memory reference specified by REF may alias 1175 the C libraries errno location. */ 1176bool 1177default_ref_may_alias_errno (ao_ref *ref) 1178{ 1179 tree base = ao_ref_base (ref); 1180 /* The default implementation assumes the errno location is 1181 a declaration of type int or is always accessed via a 1182 pointer to int. We assume that accesses to errno are 1183 not deliberately obfuscated (even in conforming ways). */ 1184 if (TYPE_UNSIGNED (TREE_TYPE (base)) 1185 || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node)) 1186 return false; 1187 /* The default implementation assumes an errno location 1188 declaration is never defined in the current compilation unit. */ 1189 if (DECL_P (base) 1190 && !TREE_STATIC (base)) 1191 return true; 1192 else if (TREE_CODE (base) == MEM_REF 1193 && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME) 1194 { 1195 struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0)); 1196 return !pi || pi->pt.anything || pi->pt.nonlocal; 1197 } 1198 return false; 1199} 1200 1201/* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode 1202 for the generic address space only. */ 1203 1204machine_mode 1205default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED) 1206{ 1207 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace)); 1208 return ptr_mode; 1209} 1210 1211/* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode 1212 for the generic address space only. */ 1213 1214machine_mode 1215default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED) 1216{ 1217 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace)); 1218 return Pmode; 1219} 1220 1221/* Named address space version of valid_pointer_mode. */ 1222 1223bool 1224default_addr_space_valid_pointer_mode (machine_mode mode, addr_space_t as) 1225{ 1226 if (!ADDR_SPACE_GENERIC_P (as)) 1227 return (mode == targetm.addr_space.pointer_mode (as) 1228 || mode == targetm.addr_space.address_mode (as)); 1229 1230 return targetm.valid_pointer_mode (mode); 1231} 1232 1233/* Some places still assume that all pointer or address modes are the 1234 standard Pmode and ptr_mode. These optimizations become invalid if 1235 the target actually supports multiple different modes. For now, 1236 we disable such optimizations on such targets, using this function. */ 1237 1238bool 1239target_default_pointer_address_modes_p (void) 1240{ 1241 if (targetm.addr_space.address_mode != default_addr_space_address_mode) 1242 return false; 1243 if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode) 1244 return false; 1245 1246 return true; 1247} 1248 1249/* Named address space version of legitimate_address_p. */ 1250 1251bool 1252default_addr_space_legitimate_address_p (machine_mode mode, rtx mem, 1253 bool strict, addr_space_t as) 1254{ 1255 if (!ADDR_SPACE_GENERIC_P (as)) 1256 gcc_unreachable (); 1257 1258 return targetm.legitimate_address_p (mode, mem, strict); 1259} 1260 1261/* Named address space version of LEGITIMIZE_ADDRESS. */ 1262 1263rtx 1264default_addr_space_legitimize_address (rtx x, rtx oldx, 1265 machine_mode mode, addr_space_t as) 1266{ 1267 if (!ADDR_SPACE_GENERIC_P (as)) 1268 return x; 1269 1270 return targetm.legitimize_address (x, oldx, mode); 1271} 1272 1273/* The default hook for determining if one named address space is a subset of 1274 another and to return which address space to use as the common address 1275 space. */ 1276 1277bool 1278default_addr_space_subset_p (addr_space_t subset, addr_space_t superset) 1279{ 1280 return (subset == superset); 1281} 1282 1283/* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be 1284 called for targets with only a generic address space. */ 1285 1286rtx 1287default_addr_space_convert (rtx op ATTRIBUTE_UNUSED, 1288 tree from_type ATTRIBUTE_UNUSED, 1289 tree to_type ATTRIBUTE_UNUSED) 1290{ 1291 gcc_unreachable (); 1292} 1293 1294bool 1295default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED) 1296{ 1297 return true; 1298} 1299 1300/* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */ 1301 1302bool 1303default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED, 1304 addr_space_t addrspace ATTRIBUTE_UNUSED) 1305{ 1306 return false; 1307} 1308 1309bool 1310default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl), 1311 tree ARG_UNUSED (name), 1312 tree ARG_UNUSED (args), 1313 int ARG_UNUSED (flags)) 1314{ 1315 warning (OPT_Wattributes, 1316 "target attribute is not supported on this machine"); 1317 1318 return false; 1319} 1320 1321bool 1322default_target_option_pragma_parse (tree ARG_UNUSED (args), 1323 tree ARG_UNUSED (pop_target)) 1324{ 1325 /* If args is NULL the caller is handle_pragma_pop_options (). In that case, 1326 emit no warning because "#pragma GCC pop_target" is valid on targets that 1327 do not have the "target" pragma. */ 1328 if (args) 1329 warning (OPT_Wpragmas, 1330 "#pragma GCC target is not supported for this machine"); 1331 1332 return false; 1333} 1334 1335bool 1336default_target_can_inline_p (tree caller, tree callee) 1337{ 1338 bool ret = false; 1339 tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee); 1340 tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller); 1341 1342 /* If callee has no option attributes, then it is ok to inline */ 1343 if (!callee_opts) 1344 ret = true; 1345 1346 /* If caller has no option attributes, but callee does then it is not ok to 1347 inline */ 1348 else if (!caller_opts) 1349 ret = false; 1350 1351 /* If both caller and callee have attributes, assume that if the 1352 pointer is different, the two functions have different target 1353 options since build_target_option_node uses a hash table for the 1354 options. */ 1355 else 1356 ret = (callee_opts == caller_opts); 1357 1358 return ret; 1359} 1360 1361#ifndef HAVE_casesi 1362# define HAVE_casesi 0 1363#endif 1364 1365/* If the machine does not have a case insn that compares the bounds, 1366 this means extra overhead for dispatch tables, which raises the 1367 threshold for using them. */ 1368 1369unsigned int 1370default_case_values_threshold (void) 1371{ 1372 return (HAVE_casesi ? 4 : 5); 1373} 1374 1375bool 1376default_have_conditional_execution (void) 1377{ 1378#ifdef HAVE_conditional_execution 1379 return HAVE_conditional_execution; 1380#else 1381 return false; 1382#endif 1383} 1384 1385/* By default we assume that c99 functions are present at the runtime, 1386 but sincos is not. */ 1387bool 1388default_libc_has_function (enum function_class fn_class) 1389{ 1390 if (fn_class == function_c94 1391 || fn_class == function_c99_misc 1392 || fn_class == function_c99_math_complex) 1393 return true; 1394 1395 return false; 1396} 1397 1398bool 1399gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED) 1400{ 1401 return true; 1402} 1403 1404bool 1405no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED) 1406{ 1407 return false; 1408} 1409 1410tree 1411default_builtin_tm_load_store (tree ARG_UNUSED (type)) 1412{ 1413 return NULL_TREE; 1414} 1415 1416/* Compute cost of moving registers to/from memory. */ 1417 1418int 1419default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED, 1420 reg_class_t rclass ATTRIBUTE_UNUSED, 1421 bool in ATTRIBUTE_UNUSED) 1422{ 1423#ifndef MEMORY_MOVE_COST 1424 return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in)); 1425#else 1426 return MEMORY_MOVE_COST (mode, (enum reg_class) rclass, in); 1427#endif 1428} 1429 1430/* Compute cost of moving data from a register of class FROM to one of 1431 TO, using MODE. */ 1432 1433int 1434default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED, 1435 reg_class_t from ATTRIBUTE_UNUSED, 1436 reg_class_t to ATTRIBUTE_UNUSED) 1437{ 1438#ifndef REGISTER_MOVE_COST 1439 return 2; 1440#else 1441 return REGISTER_MOVE_COST (mode, (enum reg_class) from, (enum reg_class) to); 1442#endif 1443} 1444 1445/* For hooks which use the MOVE_RATIO macro, this gives the legacy default 1446 behaviour. SPEED_P is true if we are compiling for speed. */ 1447 1448unsigned int 1449get_move_ratio (bool speed_p ATTRIBUTE_UNUSED) 1450{ 1451 unsigned int move_ratio; 1452#ifdef MOVE_RATIO 1453 move_ratio = (unsigned int) MOVE_RATIO (speed_p); 1454#else 1455#if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti) 1456 move_ratio = 2; 1457#else /* No movmem patterns, pick a default. */ 1458 move_ratio = ((speed_p) ? 15 : 3); 1459#endif 1460#endif 1461 return move_ratio; 1462} 1463 1464/* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be 1465 used; return FALSE if the movmem/setmem optab should be expanded, or 1466 a call to memcpy emitted. */ 1467 1468bool 1469default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size, 1470 unsigned int alignment, 1471 enum by_pieces_operation op, 1472 bool speed_p) 1473{ 1474 unsigned int max_size = 0; 1475 unsigned int ratio = 0; 1476 1477 switch (op) 1478 { 1479 case CLEAR_BY_PIECES: 1480 max_size = STORE_MAX_PIECES; 1481 ratio = CLEAR_RATIO (speed_p); 1482 break; 1483 case MOVE_BY_PIECES: 1484 max_size = MOVE_MAX_PIECES; 1485 ratio = get_move_ratio (speed_p); 1486 break; 1487 case SET_BY_PIECES: 1488 max_size = STORE_MAX_PIECES; 1489 ratio = SET_RATIO (speed_p); 1490 break; 1491 case STORE_BY_PIECES: 1492 max_size = STORE_MAX_PIECES; 1493 ratio = get_move_ratio (speed_p); 1494 break; 1495 } 1496 1497 return move_by_pieces_ninsns (size, alignment, max_size + 1) < ratio; 1498} 1499 1500bool 1501default_profile_before_prologue (void) 1502{ 1503#ifdef PROFILE_BEFORE_PROLOGUE 1504 return true; 1505#else 1506 return false; 1507#endif 1508} 1509 1510/* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */ 1511 1512reg_class_t 1513default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED, 1514 reg_class_t rclass) 1515{ 1516#ifdef PREFERRED_RELOAD_CLASS 1517 return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass); 1518#else 1519 return rclass; 1520#endif 1521} 1522 1523/* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */ 1524 1525reg_class_t 1526default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED, 1527 reg_class_t rclass) 1528{ 1529 return rclass; 1530} 1531 1532/* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */ 1533reg_class_t 1534default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED) 1535{ 1536 return NO_REGS; 1537} 1538 1539/* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */ 1540 1541bool 1542default_class_likely_spilled_p (reg_class_t rclass) 1543{ 1544 return (reg_class_size[(int) rclass] == 1); 1545} 1546 1547/* The default implementation of TARGET_CLASS_MAX_NREGS. */ 1548 1549unsigned char 1550default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED, 1551 machine_mode mode ATTRIBUTE_UNUSED) 1552{ 1553#ifdef CLASS_MAX_NREGS 1554 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class) rclass, mode); 1555#else 1556 return ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD); 1557#endif 1558} 1559 1560/* Determine the debugging unwind mechanism for the target. */ 1561 1562enum unwind_info_type 1563default_debug_unwind_info (void) 1564{ 1565 /* If the target wants to force the use of dwarf2 unwind info, let it. */ 1566 /* ??? Change all users to the hook, then poison this. */ 1567#ifdef DWARF2_FRAME_INFO 1568 if (DWARF2_FRAME_INFO) 1569 return UI_DWARF2; 1570#endif 1571 1572 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */ 1573#ifdef DWARF2_DEBUGGING_INFO 1574 if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG) 1575 return UI_DWARF2; 1576#endif 1577 1578 return UI_NONE; 1579} 1580 1581/* Determine the correct mode for a Dwarf frame register that represents 1582 register REGNO. */ 1583 1584machine_mode 1585default_dwarf_frame_reg_mode (int regno) 1586{ 1587 machine_mode save_mode = reg_raw_mode[regno]; 1588 1589 if (HARD_REGNO_CALL_PART_CLOBBERED (regno, save_mode)) 1590 save_mode = choose_hard_reg_mode (regno, 1, true); 1591 return save_mode; 1592} 1593 1594/* To be used by targets where reg_raw_mode doesn't return the right 1595 mode for registers used in apply_builtin_return and apply_builtin_arg. */ 1596 1597machine_mode 1598default_get_reg_raw_mode (int regno) 1599{ 1600 return reg_raw_mode[regno]; 1601} 1602 1603/* Return true if a leaf function should stay leaf even with profiling 1604 enabled. */ 1605 1606bool 1607default_keep_leaf_when_profiled () 1608{ 1609 return false; 1610} 1611 1612/* Return true if the state of option OPTION should be stored in PCH files 1613 and checked by default_pch_valid_p. Store the option's current state 1614 in STATE if so. */ 1615 1616static inline bool 1617option_affects_pch_p (int option, struct cl_option_state *state) 1618{ 1619 if ((cl_options[option].flags & CL_TARGET) == 0) 1620 return false; 1621 if ((cl_options[option].flags & CL_PCH_IGNORE) != 0) 1622 return false; 1623 if (option_flag_var (option, &global_options) == &target_flags) 1624 if (targetm.check_pch_target_flags) 1625 return false; 1626 return get_option_state (&global_options, option, state); 1627} 1628 1629/* Default version of get_pch_validity. 1630 By default, every flag difference is fatal; that will be mostly right for 1631 most targets, but completely right for very few. */ 1632 1633void * 1634default_get_pch_validity (size_t *sz) 1635{ 1636 struct cl_option_state state; 1637 size_t i; 1638 char *result, *r; 1639 1640 *sz = 2; 1641 if (targetm.check_pch_target_flags) 1642 *sz += sizeof (target_flags); 1643 for (i = 0; i < cl_options_count; i++) 1644 if (option_affects_pch_p (i, &state)) 1645 *sz += state.size; 1646 1647 result = r = XNEWVEC (char, *sz); 1648 r[0] = flag_pic; 1649 r[1] = flag_pie; 1650 r += 2; 1651 if (targetm.check_pch_target_flags) 1652 { 1653 memcpy (r, &target_flags, sizeof (target_flags)); 1654 r += sizeof (target_flags); 1655 } 1656 1657 for (i = 0; i < cl_options_count; i++) 1658 if (option_affects_pch_p (i, &state)) 1659 { 1660 memcpy (r, state.data, state.size); 1661 r += state.size; 1662 } 1663 1664 return result; 1665} 1666 1667/* Return a message which says that a PCH file was created with a different 1668 setting of OPTION. */ 1669 1670static const char * 1671pch_option_mismatch (const char *option) 1672{ 1673 return xasprintf (_("created and used with differing settings of '%s'"), 1674 option); 1675} 1676 1677/* Default version of pch_valid_p. */ 1678 1679const char * 1680default_pch_valid_p (const void *data_p, size_t len) 1681{ 1682 struct cl_option_state state; 1683 const char *data = (const char *)data_p; 1684 size_t i; 1685 1686 /* -fpic and -fpie also usually make a PCH invalid. */ 1687 if (data[0] != flag_pic) 1688 return _("created and used with different settings of -fpic"); 1689 if (data[1] != flag_pie) 1690 return _("created and used with different settings of -fpie"); 1691 data += 2; 1692 1693 /* Check target_flags. */ 1694 if (targetm.check_pch_target_flags) 1695 { 1696 int tf; 1697 const char *r; 1698 1699 memcpy (&tf, data, sizeof (target_flags)); 1700 data += sizeof (target_flags); 1701 len -= sizeof (target_flags); 1702 r = targetm.check_pch_target_flags (tf); 1703 if (r != NULL) 1704 return r; 1705 } 1706 1707 for (i = 0; i < cl_options_count; i++) 1708 if (option_affects_pch_p (i, &state)) 1709 { 1710 if (memcmp (data, state.data, state.size) != 0) 1711 return pch_option_mismatch (cl_options[i].opt_text); 1712 data += state.size; 1713 len -= state.size; 1714 } 1715 1716 return NULL; 1717} 1718 1719/* Default version of cstore_mode. */ 1720 1721machine_mode 1722default_cstore_mode (enum insn_code icode) 1723{ 1724 return insn_data[(int) icode].operand[0].mode; 1725} 1726 1727/* Default version of member_type_forces_blk. */ 1728 1729bool 1730default_member_type_forces_blk (const_tree, machine_mode) 1731{ 1732 return false; 1733} 1734 1735rtx 1736default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED, 1737 rtx ptr ATTRIBUTE_UNUSED, 1738 rtx bnd ATTRIBUTE_UNUSED) 1739{ 1740 gcc_unreachable (); 1741} 1742 1743void 1744default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED, 1745 rtx addr ATTRIBUTE_UNUSED, 1746 rtx bounds ATTRIBUTE_UNUSED, 1747 rtx to ATTRIBUTE_UNUSED) 1748{ 1749 gcc_unreachable (); 1750} 1751 1752rtx 1753default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED) 1754{ 1755 gcc_unreachable (); 1756} 1757 1758void 1759default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED, 1760 rtx bounds ATTRIBUTE_UNUSED) 1761{ 1762 gcc_unreachable (); 1763} 1764 1765/* Default version of canonicalize_comparison. */ 1766 1767void 1768default_canonicalize_comparison (int *, rtx *, rtx *, bool) 1769{ 1770} 1771 1772/* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */ 1773 1774void 1775default_atomic_assign_expand_fenv (tree *, tree *, tree *) 1776{ 1777} 1778 1779#ifndef PAD_VARARGS_DOWN 1780#define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN 1781#endif 1782 1783/* Build an indirect-ref expression over the given TREE, which represents a 1784 piece of a va_arg() expansion. */ 1785tree 1786build_va_arg_indirect_ref (tree addr) 1787{ 1788 addr = build_simple_mem_ref_loc (EXPR_LOCATION (addr), addr); 1789 return addr; 1790} 1791 1792/* The "standard" implementation of va_arg: read the value from the 1793 current (padded) address and increment by the (padded) size. */ 1794 1795tree 1796std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p, 1797 gimple_seq *post_p) 1798{ 1799 tree addr, t, type_size, rounded_size, valist_tmp; 1800 unsigned HOST_WIDE_INT align, boundary; 1801 bool indirect; 1802 1803#ifdef ARGS_GROW_DOWNWARD 1804 /* All of the alignment and movement below is for args-grow-up machines. 1805 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all 1806 implement their own specialized gimplify_va_arg_expr routines. */ 1807 gcc_unreachable (); 1808#endif 1809 1810 indirect = pass_by_reference (NULL, TYPE_MODE (type), type, false); 1811 if (indirect) 1812 type = build_pointer_type (type); 1813 1814 align = PARM_BOUNDARY / BITS_PER_UNIT; 1815 boundary = targetm.calls.function_arg_boundary (TYPE_MODE (type), type); 1816 1817 /* When we align parameter on stack for caller, if the parameter 1818 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be 1819 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee 1820 here with caller. */ 1821 if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT) 1822 boundary = MAX_SUPPORTED_STACK_ALIGNMENT; 1823 1824 boundary /= BITS_PER_UNIT; 1825 1826 /* Hoist the valist value into a temporary for the moment. */ 1827 valist_tmp = get_initialized_tmp_var (valist, pre_p, NULL); 1828 1829 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually 1830 requires greater alignment, we must perform dynamic alignment. */ 1831 if (boundary > align 1832 && !integer_zerop (TYPE_SIZE (type))) 1833 { 1834 t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp, 1835 fold_build_pointer_plus_hwi (valist_tmp, boundary - 1)); 1836 gimplify_and_add (t, pre_p); 1837 1838 t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp, 1839 fold_build2 (BIT_AND_EXPR, TREE_TYPE (valist), 1840 valist_tmp, 1841 build_int_cst (TREE_TYPE (valist), -boundary))); 1842 gimplify_and_add (t, pre_p); 1843 } 1844 else 1845 boundary = align; 1846 1847 /* If the actual alignment is less than the alignment of the type, 1848 adjust the type accordingly so that we don't assume strict alignment 1849 when dereferencing the pointer. */ 1850 boundary *= BITS_PER_UNIT; 1851 if (boundary < TYPE_ALIGN (type)) 1852 { 1853 type = build_variant_type_copy (type); 1854 TYPE_ALIGN (type) = boundary; 1855 } 1856 1857 /* Compute the rounded size of the type. */ 1858 type_size = size_in_bytes (type); 1859 rounded_size = round_up (type_size, align); 1860 1861 /* Reduce rounded_size so it's sharable with the postqueue. */ 1862 gimplify_expr (&rounded_size, pre_p, post_p, is_gimple_val, fb_rvalue); 1863 1864 /* Get AP. */ 1865 addr = valist_tmp; 1866 if (PAD_VARARGS_DOWN && !integer_zerop (rounded_size)) 1867 { 1868 /* Small args are padded downward. */ 1869 t = fold_build2_loc (input_location, GT_EXPR, sizetype, 1870 rounded_size, size_int (align)); 1871 t = fold_build3 (COND_EXPR, sizetype, t, size_zero_node, 1872 size_binop (MINUS_EXPR, rounded_size, type_size)); 1873 addr = fold_build_pointer_plus (addr, t); 1874 } 1875 1876 /* Compute new value for AP. */ 1877 t = fold_build_pointer_plus (valist_tmp, rounded_size); 1878 t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist, t); 1879 gimplify_and_add (t, pre_p); 1880 1881 addr = fold_convert (build_pointer_type (type), addr); 1882 1883 if (indirect) 1884 addr = build_va_arg_indirect_ref (addr); 1885 1886 return build_va_arg_indirect_ref (addr); 1887} 1888 1889tree 1890default_chkp_bound_type (void) 1891{ 1892 tree res = make_node (POINTER_BOUNDS_TYPE); 1893 TYPE_PRECISION (res) = TYPE_PRECISION (size_type_node) * 2; 1894 TYPE_NAME (res) = get_identifier ("__bounds_type"); 1895 SET_TYPE_MODE (res, targetm.chkp_bound_mode ()); 1896 layout_type (res); 1897 return res; 1898} 1899 1900enum machine_mode 1901default_chkp_bound_mode (void) 1902{ 1903 return VOIDmode; 1904} 1905 1906tree 1907default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED) 1908{ 1909 return NULL_TREE; 1910} 1911 1912rtx 1913default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED, 1914 const_tree fn_decl_or_type ATTRIBUTE_UNUSED, 1915 bool outgoing ATTRIBUTE_UNUSED) 1916{ 1917 gcc_unreachable (); 1918} 1919 1920tree 1921default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED, 1922 HOST_WIDE_INT ub ATTRIBUTE_UNUSED) 1923{ 1924 return NULL_TREE; 1925} 1926 1927int 1928default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED, 1929 tree lb ATTRIBUTE_UNUSED, 1930 tree ub ATTRIBUTE_UNUSED, 1931 tree *stmts ATTRIBUTE_UNUSED) 1932{ 1933 return 0; 1934} 1935 1936void 1937default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED, 1938 enum machine_mode mode ATTRIBUTE_UNUSED, 1939 tree type ATTRIBUTE_UNUSED, 1940 int *pretend_arg_size ATTRIBUTE_UNUSED, 1941 int second_time ATTRIBUTE_UNUSED) 1942{ 1943} 1944 1945/* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do 1946 not support nested low-overhead loops. */ 1947 1948bool 1949can_use_doloop_if_innermost (const widest_int &, const widest_int &, 1950 unsigned int loop_depth, bool) 1951{ 1952 return loop_depth == 1; 1953} 1954 1955#include "gt-targhooks.h" 1956