1 /* Definitions for code generation pass of GNU compiler. 2 Copyright (C) 1987-2013 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it under 7 the terms of the GNU General Public License as published by the Free 8 Software Foundation; either version 3, or (at your option) any later 9 version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 #ifndef GCC_EXPR_H 21 #define GCC_EXPR_H 22 23 /* For inhibit_defer_pop */ 24 #include "function.h" 25 /* For XEXP, GEN_INT, rtx_code */ 26 #include "rtl.h" 27 /* For optimize_size */ 28 #include "flags.h" 29 /* For host_integerp, tree_low_cst, fold_convert, size_binop, ssize_int, 30 TREE_CODE, TYPE_SIZE, int_size_in_bytes, */ 31 #include "tree.h" 32 /* For GET_MODE_BITSIZE, word_mode */ 33 #include "machmode.h" 34 35 /* This is the 4th arg to `expand_expr'. 36 EXPAND_STACK_PARM means we are possibly expanding a call param onto 37 the stack. 38 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx. 39 EXPAND_INITIALIZER is similar but also record any labels on forced_labels. 40 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address 41 is a constant that is not a legitimate address. 42 EXPAND_WRITE means we are only going to write to the resulting rtx. 43 EXPAND_MEMORY means we are interested in a memory result, even if 44 the memory is constant and we could have propagated a constant value, 45 or the memory is unaligned on a STRICT_ALIGNMENT target. */ 46 enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM, 47 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE, 48 EXPAND_MEMORY}; 49 50 /* Prevent the compiler from deferring stack pops. See 51 inhibit_defer_pop for more information. */ 52 #define NO_DEFER_POP (inhibit_defer_pop += 1) 53 54 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for 55 more information. */ 56 #define OK_DEFER_POP (inhibit_defer_pop -= 1) 57 58 enum direction {none, upward, downward}; 59 60 /* Structure to record the size of a sequence of arguments 61 as the sum of a tree-expression and a constant. This structure is 62 also used to store offsets from the stack, which might be negative, 63 so the variable part must be ssizetype, not sizetype. */ 64 65 struct args_size 66 { 67 HOST_WIDE_INT constant; 68 tree var; 69 }; 70 71 /* Package up various arg related fields of struct args for 72 locate_and_pad_parm. */ 73 struct locate_and_pad_arg_data 74 { 75 /* Size of this argument on the stack, rounded up for any padding it 76 gets. If REG_PARM_STACK_SPACE is defined, then register parms are 77 counted here, otherwise they aren't. */ 78 struct args_size size; 79 /* Offset of this argument from beginning of stack-args. */ 80 struct args_size offset; 81 /* Offset to the start of the stack slot. Different from OFFSET 82 if this arg pads downward. */ 83 struct args_size slot_offset; 84 /* The amount that the stack pointer needs to be adjusted to 85 force alignment for the next argument. */ 86 struct args_size alignment_pad; 87 /* Which way we should pad this arg. */ 88 enum direction where_pad; 89 /* slot_offset is at least this aligned. */ 90 unsigned int boundary; 91 }; 92 93 /* Add the value of the tree INC to the `struct args_size' TO. */ 94 95 #define ADD_PARM_SIZE(TO, INC) \ 96 do { \ 97 tree inc = (INC); \ 98 if (host_integerp (inc, 0)) \ 99 (TO).constant += tree_low_cst (inc, 0); \ 100 else if ((TO).var == 0) \ 101 (TO).var = fold_convert (ssizetype, inc); \ 102 else \ 103 (TO).var = size_binop (PLUS_EXPR, (TO).var, \ 104 fold_convert (ssizetype, inc)); \ 105 } while (0) 106 107 #define SUB_PARM_SIZE(TO, DEC) \ 108 do { \ 109 tree dec = (DEC); \ 110 if (host_integerp (dec, 0)) \ 111 (TO).constant -= tree_low_cst (dec, 0); \ 112 else if ((TO).var == 0) \ 113 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \ 114 fold_convert (ssizetype, dec)); \ 115 else \ 116 (TO).var = size_binop (MINUS_EXPR, (TO).var, \ 117 fold_convert (ssizetype, dec)); \ 118 } while (0) 119 120 /* Convert the implicit sum in a `struct args_size' into a tree 121 of type ssizetype. */ 122 #define ARGS_SIZE_TREE(SIZE) \ 123 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \ 124 : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \ 125 ssize_int ((SIZE).constant))) 126 127 /* Convert the implicit sum in a `struct args_size' into an rtx. */ 128 #define ARGS_SIZE_RTX(SIZE) \ 129 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \ 130 : expand_normal (ARGS_SIZE_TREE (SIZE))) 131 132 133 /* This structure is used to pass around information about exploded 134 unary, binary and trinary expressions between expand_expr_real_1 and 135 friends. */ 136 typedef struct separate_ops 137 { 138 enum tree_code code; 139 location_t location; 140 tree type; 141 tree op0, op1, op2; 142 } *sepops; 143 144 /* Functions from optabs.c, commonly used, and without need for the optabs 145 tables: */ 146 147 /* Passed to expand_simple_binop and expand_binop to say which options 148 to try to use if the requested operation can't be open-coded on the 149 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using 150 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try 151 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't 152 try anything else. */ 153 154 enum optab_methods 155 { 156 OPTAB_DIRECT, 157 OPTAB_LIB, 158 OPTAB_WIDEN, 159 OPTAB_LIB_WIDEN, 160 OPTAB_MUST_WIDEN 161 }; 162 163 /* Generate code for a simple binary or unary operation. "Simple" in 164 this case means "can be unambiguously described by a (mode, code) 165 pair and mapped to a single optab." */ 166 extern rtx expand_simple_binop (enum machine_mode, enum rtx_code, rtx, 167 rtx, rtx, int, enum optab_methods); 168 extern rtx expand_simple_unop (enum machine_mode, enum rtx_code, rtx, rtx, 169 int); 170 171 /* Report whether the machine description contains an insn which can 172 perform the operation described by CODE and MODE. */ 173 extern int have_insn_for (enum rtx_code, enum machine_mode); 174 175 /* Emit code to make a call to a constant function or a library call. */ 176 extern void emit_libcall_block (rtx, rtx, rtx, rtx); 177 178 /* Create but don't emit one rtl instruction to perform certain operations. 179 Modes must match; operands must meet the operation's predicates. 180 Likewise for subtraction and for just copying. */ 181 extern rtx gen_add2_insn (rtx, rtx); 182 extern rtx gen_add3_insn (rtx, rtx, rtx); 183 extern rtx gen_sub2_insn (rtx, rtx); 184 extern rtx gen_sub3_insn (rtx, rtx, rtx); 185 extern rtx gen_move_insn (rtx, rtx); 186 extern int have_add2_insn (rtx, rtx); 187 extern int have_sub2_insn (rtx, rtx); 188 189 /* Emit a pair of rtl insns to compare two rtx's and to jump 190 to a label if the comparison is true. */ 191 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx, 192 enum machine_mode, int, rtx, int prob=-1); 193 194 /* Generate code to indirectly jump to a location given in the rtx LOC. */ 195 extern void emit_indirect_jump (rtx); 196 197 /* Generate a conditional trap instruction. */ 198 extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx); 199 200 #include "insn-config.h" 201 202 #ifdef HAVE_conditional_move 203 /* Emit a conditional move operation. */ 204 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode, 205 rtx, rtx, enum machine_mode, int); 206 207 /* Return nonzero if the conditional move is supported. */ 208 int can_conditionally_move_p (enum machine_mode mode); 209 210 #endif 211 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode, 212 rtx, rtx, enum machine_mode, int); 213 214 rtx expand_sync_operation (rtx, rtx, enum rtx_code); 215 rtx expand_sync_fetch_operation (rtx, rtx, enum rtx_code, bool, rtx); 216 rtx expand_sync_lock_test_and_set (rtx, rtx, rtx); 217 218 rtx expand_atomic_exchange (rtx, rtx, rtx, enum memmodel); 219 rtx expand_atomic_load (rtx, rtx, enum memmodel); 220 rtx expand_atomic_store (rtx, rtx, enum memmodel, bool); 221 rtx expand_atomic_fetch_op (rtx, rtx, rtx, enum rtx_code, enum memmodel, 222 bool); 223 rtx expand_atomic_test_and_set (rtx, rtx, enum memmodel); 224 rtx expand_atomic_clear (rtx, enum memmodel); 225 void expand_atomic_thread_fence (enum memmodel); 226 void expand_atomic_signal_fence (enum memmodel); 227 228 229 /* Functions from expmed.c: */ 230 231 /* Arguments MODE, RTX: return an rtx for the negation of that value. 232 May emit insns. */ 233 extern rtx negate_rtx (enum machine_mode, rtx); 234 235 /* Expand a logical AND operation. */ 236 extern rtx expand_and (enum machine_mode, rtx, rtx, rtx); 237 238 /* Emit a store-flag operation. */ 239 extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode, 240 int, int); 241 242 /* Like emit_store_flag, but always succeeds. */ 243 extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx, 244 enum machine_mode, int, int); 245 246 /* Choose a minimal N + 1 bit approximation to 1/D that can be used to 247 replace division by D, and put the least significant N bits of the result 248 in *MULTIPLIER_PTR and return the most significant bit. */ 249 extern unsigned HOST_WIDE_INT choose_multiplier (unsigned HOST_WIDE_INT, int, 250 int, unsigned HOST_WIDE_INT *, 251 int *, int *); 252 253 /* Functions from builtins.c: */ 254 extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int); 255 extern tree std_build_builtin_va_list (void); 256 extern tree std_fn_abi_va_list (tree); 257 extern tree std_canonical_va_list_type (tree); 258 259 extern void std_expand_builtin_va_start (tree, rtx); 260 extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int); 261 extern void expand_builtin_setjmp_setup (rtx, rtx); 262 extern void expand_builtin_setjmp_receiver (rtx); 263 extern rtx expand_builtin_saveregs (void); 264 extern void expand_builtin_trap (void); 265 extern rtx builtin_strncpy_read_str (void *, HOST_WIDE_INT, enum machine_mode); 266 267 /* Functions from expr.c: */ 268 269 /* This is run during target initialization to set up which modes can be 270 used directly in memory and to initialize the block move optab. */ 271 extern void init_expr_target (void); 272 273 /* This is run at the start of compiling a function. */ 274 extern void init_expr (void); 275 276 /* Emit some rtl insns to move data between rtx's, converting machine modes. 277 Both modes must be floating or both fixed. */ 278 extern void convert_move (rtx, rtx, int); 279 280 /* Convert an rtx to specified machine mode and return the result. */ 281 extern rtx convert_to_mode (enum machine_mode, rtx, int); 282 283 /* Convert an rtx to MODE from OLDMODE and return the result. */ 284 extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int); 285 286 /* Emit code to move a block Y to a block X. */ 287 288 enum block_op_methods 289 { 290 BLOCK_OP_NORMAL, 291 BLOCK_OP_NO_LIBCALL, 292 BLOCK_OP_CALL_PARM, 293 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */ 294 BLOCK_OP_TAILCALL 295 }; 296 297 extern GTY(()) tree block_clear_fn; 298 extern void init_block_move_fn (const char *); 299 extern void init_block_clear_fn (const char *); 300 301 extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods); 302 extern rtx emit_block_move_via_libcall (rtx, rtx, rtx, bool); 303 extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods, 304 unsigned int, HOST_WIDE_INT); 305 extern bool emit_storent_insn (rtx to, rtx from); 306 307 /* Copy all or part of a value X into registers starting at REGNO. 308 The number of registers to be filled is NREGS. */ 309 extern void move_block_to_reg (int, rtx, int, enum machine_mode); 310 311 /* Copy all or part of a BLKmode value X out of registers starting at REGNO. 312 The number of registers to be filled is NREGS. */ 313 extern void move_block_from_reg (int, rtx, int); 314 315 /* Generate a non-consecutive group of registers represented by a PARALLEL. */ 316 extern rtx gen_group_rtx (rtx); 317 318 /* Load a BLKmode value into non-consecutive registers represented by a 319 PARALLEL. */ 320 extern void emit_group_load (rtx, rtx, tree, int); 321 322 /* Similarly, but load into new temporaries. */ 323 extern rtx emit_group_load_into_temps (rtx, rtx, tree, int); 324 325 /* Move a non-consecutive group of registers represented by a PARALLEL into 326 a non-consecutive group of registers represented by a PARALLEL. */ 327 extern void emit_group_move (rtx, rtx); 328 329 /* Move a group of registers represented by a PARALLEL into pseudos. */ 330 extern rtx emit_group_move_into_temps (rtx); 331 332 /* Store a BLKmode value from non-consecutive registers represented by a 333 PARALLEL. */ 334 extern void emit_group_store (rtx, rtx, tree, int); 335 336 extern rtx maybe_emit_group_store (rtx, tree); 337 338 /* Copy BLKmode object from a set of registers. */ 339 extern void copy_blkmode_from_reg (rtx, rtx, tree); 340 341 /* Mark REG as holding a parameter for the next CALL_INSN. 342 Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */ 343 extern void use_reg_mode (rtx *, rtx, enum machine_mode); 344 345 extern rtx copy_blkmode_to_reg (enum machine_mode, tree); 346 347 /* Mark REG as holding a parameter for the next CALL_INSN. */ 348 static inline void 349 use_reg (rtx *fusage, rtx reg) 350 { 351 use_reg_mode (fusage, reg, VOIDmode); 352 } 353 354 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters 355 for the next CALL_INSN. */ 356 extern void use_regs (rtx *, int, int); 357 358 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */ 359 extern void use_group_regs (rtx *, rtx); 360 361 /* Write zeros through the storage of OBJECT. 362 If OBJECT has BLKmode, SIZE is its length in bytes. */ 363 extern rtx clear_storage (rtx, rtx, enum block_op_methods); 364 extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods, 365 unsigned int, HOST_WIDE_INT); 366 /* The same, but always output an library call. */ 367 rtx set_storage_via_libcall (rtx, rtx, rtx, bool); 368 369 /* Expand a setmem pattern; return true if successful. */ 370 extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int, 371 unsigned int, HOST_WIDE_INT); 372 373 extern unsigned HOST_WIDE_INT move_by_pieces_ninsns (unsigned HOST_WIDE_INT, 374 unsigned int, 375 unsigned int); 376 377 /* Return nonzero if it is desirable to store LEN bytes generated by 378 CONSTFUN with several move instructions by store_by_pieces 379 function. CONSTFUNDATA is a pointer which will be passed as argument 380 in every CONSTFUN call. 381 ALIGN is maximum alignment we can assume. 382 MEMSETP is true if this is a real memset/bzero, not a copy 383 of a const string. */ 384 extern int can_store_by_pieces (unsigned HOST_WIDE_INT, 385 rtx (*) (void *, HOST_WIDE_INT, 386 enum machine_mode), 387 void *, unsigned int, bool); 388 389 /* Generate several move instructions to store LEN bytes generated by 390 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a 391 pointer which will be passed as argument in every CONSTFUN call. 392 ALIGN is maximum alignment we can assume. 393 MEMSETP is true if this is a real memset/bzero, not a copy. 394 Returns TO + LEN. */ 395 extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, 396 rtx (*) (void *, HOST_WIDE_INT, enum machine_mode), 397 void *, unsigned int, bool, int); 398 399 /* Emit insns to set X from Y. */ 400 extern rtx emit_move_insn (rtx, rtx); 401 402 /* Emit insns to set X from Y, with no frills. */ 403 extern rtx emit_move_insn_1 (rtx, rtx); 404 405 extern rtx emit_move_complex_push (enum machine_mode, rtx, rtx); 406 extern rtx emit_move_complex_parts (rtx, rtx); 407 408 /* Push a block of length SIZE (perhaps variable) 409 and return an rtx to address the beginning of the block. */ 410 extern rtx push_block (rtx, int, int); 411 412 /* Generate code to push something onto the stack, given its mode and type. */ 413 extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int, 414 int, rtx, int, rtx, rtx, int, rtx); 415 416 /* Expand an assignment that stores the value of FROM into TO. */ 417 extern void expand_assignment (tree, tree, bool); 418 419 /* Generate code for computing expression EXP, 420 and storing the value into TARGET. 421 If SUGGEST_REG is nonzero, copy the value through a register 422 and return that register, if that is possible. */ 423 extern rtx store_expr (tree, rtx, int, bool); 424 425 /* Given an rtx that may include add and multiply operations, 426 generate them as insns and return a pseudo-reg containing the value. 427 Useful after calling expand_expr with 1 as sum_ok. */ 428 extern rtx force_operand (rtx, rtx); 429 430 /* Work horses for expand_expr. */ 431 extern rtx expand_expr_real (tree, rtx, enum machine_mode, 432 enum expand_modifier, rtx *, bool); 433 extern rtx expand_expr_real_1 (tree, rtx, enum machine_mode, 434 enum expand_modifier, rtx *, bool); 435 extern rtx expand_expr_real_2 (sepops, rtx, enum machine_mode, 436 enum expand_modifier); 437 438 /* Generate code for computing expression EXP. 439 An rtx for the computed value is returned. The value is never null. 440 In the case of a void EXP, const0_rtx is returned. */ 441 static inline rtx 442 expand_expr (tree exp, rtx target, enum machine_mode mode, 443 enum expand_modifier modifier) 444 { 445 return expand_expr_real (exp, target, mode, modifier, NULL, false); 446 } 447 448 static inline rtx 449 expand_normal (tree exp) 450 { 451 return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL, false); 452 } 453 454 /* At the start of a function, record that we have no previously-pushed 455 arguments waiting to be popped. */ 456 extern void init_pending_stack_adjust (void); 457 458 /* Discard any pending stack adjustment. */ 459 extern void discard_pending_stack_adjust (void); 460 461 /* When exiting from function, if safe, clear out any pending stack adjust 462 so the adjustment won't get done. */ 463 extern void clear_pending_stack_adjust (void); 464 465 /* Pop any previously-pushed arguments that have not been popped yet. */ 466 extern void do_pending_stack_adjust (void); 467 468 /* Return the tree node and offset if a given argument corresponds to 469 a string constant. */ 470 extern tree string_constant (tree, tree *); 471 472 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */ 473 extern void jumpifnot (tree, rtx, int); 474 extern void jumpifnot_1 (enum tree_code, tree, tree, rtx, int); 475 476 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */ 477 extern void jumpif (tree, rtx, int); 478 extern void jumpif_1 (enum tree_code, tree, tree, rtx, int); 479 480 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if 481 the result is zero, or IF_TRUE_LABEL if the result is one. */ 482 extern void do_jump (tree, rtx, rtx, int); 483 extern void do_jump_1 (enum tree_code, tree, tree, rtx, rtx, int); 484 485 extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int, 486 enum machine_mode, rtx, rtx, rtx, int); 487 488 /* Two different ways of generating switch statements. */ 489 extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx, int); 490 extern int try_tablejump (tree, tree, tree, tree, rtx, rtx, int); 491 492 /* Functions from alias.c */ 493 #include "alias.h" 494 495 496 /* rtl.h and tree.h were included. */ 497 /* Return an rtx for the size in bytes of the value of an expr. */ 498 extern rtx expr_size (tree); 499 500 /* Return a wide integer for the size in bytes of the value of EXP, or -1 501 if the size can vary or is larger than an integer. */ 502 extern HOST_WIDE_INT int_expr_size (tree); 503 504 /* Return an rtx that refers to the value returned by a function 505 in its original home. This becomes invalid if any more code is emitted. */ 506 extern rtx hard_function_value (const_tree, const_tree, const_tree, int); 507 508 extern rtx prepare_call_address (tree, rtx, rtx, rtx *, int, int); 509 510 extern bool shift_return_value (enum machine_mode, bool, rtx); 511 512 extern rtx expand_call (tree, rtx, int); 513 514 extern void fixup_tail_calls (void); 515 516 #ifdef TREE_CODE 517 extern rtx expand_variable_shift (enum tree_code, enum machine_mode, 518 rtx, tree, rtx, int); 519 extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, int, rtx, 520 int); 521 extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx, 522 rtx, int); 523 #endif 524 525 extern void locate_and_pad_parm (enum machine_mode, tree, int, int, int, 526 tree, struct args_size *, 527 struct locate_and_pad_arg_data *); 528 529 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */ 530 extern rtx label_rtx (tree); 531 532 /* As label_rtx, but additionally the label is placed on the forced label 533 list of its containing function (i.e. it is treated as reachable even 534 if how is not obvious). */ 535 extern rtx force_label_rtx (tree); 536 537 /* Return an rtx like arg but sans any constant terms. 538 Returns the original rtx if it has no constant terms. 539 The constant terms are added and stored via a second arg. */ 540 extern rtx eliminate_constant_term (rtx, rtx *); 541 542 /* Convert arg to a valid memory address for specified machine mode that points 543 to a specific named address space, by emitting insns to perform arithmetic 544 if necessary. */ 545 extern rtx memory_address_addr_space (enum machine_mode, rtx, addr_space_t); 546 547 /* Like memory_address_addr_space, except assume the memory address points to 548 the generic named address space. */ 549 #define memory_address(MODE,RTX) \ 550 memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC) 551 552 /* Return a memory reference like MEMREF, but with its mode changed 553 to MODE and its address changed to ADDR. 554 (VOIDmode means don't change the mode. 555 NULL for ADDR means don't change the address.) */ 556 extern rtx change_address (rtx, enum machine_mode, rtx); 557 558 /* Return a memory reference like MEMREF, but with its mode changed 559 to MODE and its address offset by OFFSET bytes. */ 560 #define adjust_address(MEMREF, MODE, OFFSET) \ 561 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 0, 0) 562 563 /* Likewise, but the reference is not required to be valid. */ 564 #define adjust_address_nv(MEMREF, MODE, OFFSET) \ 565 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1, 0, 0) 566 567 /* Return a memory reference like MEMREF, but with its mode changed 568 to MODE and its address offset by OFFSET bytes. Assume that it's 569 for a bitfield and conservatively drop the underlying object if we 570 cannot be sure to stay within its bounds. */ 571 #define adjust_bitfield_address(MEMREF, MODE, OFFSET) \ 572 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 1, 0) 573 574 /* As for adjust_bitfield_address, but specify that the width of 575 BLKmode accesses is SIZE bytes. */ 576 #define adjust_bitfield_address_size(MEMREF, MODE, OFFSET, SIZE) \ 577 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 1, SIZE) 578 579 /* Likewise, but the reference is not required to be valid. */ 580 #define adjust_bitfield_address_nv(MEMREF, MODE, OFFSET) \ 581 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1, 1, 0) 582 583 /* Return a memory reference like MEMREF, but with its mode changed 584 to MODE and its address changed to ADDR, which is assumed to be 585 increased by OFFSET bytes from MEMREF. */ 586 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \ 587 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1) 588 589 /* Likewise, but the reference is not required to be valid. */ 590 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \ 591 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0) 592 593 extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int, 594 int, HOST_WIDE_INT); 595 extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx, 596 HOST_WIDE_INT, int); 597 598 /* Return a memory reference like MEMREF, but whose address is changed by 599 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor 600 known to be in OFFSET (possibly 1). */ 601 extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT); 602 603 /* Definitions from emit-rtl.c */ 604 #include "emit-rtl.h" 605 606 /* Return a memory reference like MEMREF, but with its mode widened to 607 MODE and adjusted by OFFSET. */ 608 extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT); 609 610 /* Return a memory reference like MEMREF, but which is known to have a 611 valid address. */ 612 extern rtx validize_mem (rtx); 613 614 extern rtx use_anchored_address (rtx); 615 616 /* Given REF, a MEM, and T, either the type of X or the expression 617 corresponding to REF, set the memory attributes. OBJECTP is nonzero 618 if we are making a new object of this type. */ 619 extern void set_mem_attributes (rtx, tree, int); 620 621 /* Similar, except that BITPOS has not yet been applied to REF, so if 622 we alter MEM_OFFSET according to T then we should subtract BITPOS 623 expecting that it'll be added back in later. */ 624 extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT); 625 626 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN 627 bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or 628 -1 if not known. */ 629 extern int get_mem_align_offset (rtx, unsigned int); 630 631 /* Assemble the static constant template for function entry trampolines. */ 632 extern rtx assemble_trampoline_template (void); 633 634 /* Copy given rtx to a new temp reg and return that. */ 635 extern rtx copy_to_reg (rtx); 636 637 /* Like copy_to_reg but always make the reg Pmode. */ 638 extern rtx copy_addr_to_reg (rtx); 639 640 /* Like copy_to_reg but always make the reg the specified mode MODE. */ 641 extern rtx copy_to_mode_reg (enum machine_mode, rtx); 642 643 /* Copy given rtx to given temp reg and return that. */ 644 extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode); 645 646 /* Copy a value to a register if it isn't already a register. 647 Args are mode (in case value is a constant) and the value. */ 648 extern rtx force_reg (enum machine_mode, rtx); 649 650 /* Return given rtx, copied into a new temp reg if it was in memory. */ 651 extern rtx force_not_mem (rtx); 652 653 /* Return mode and signedness to use when an argument or result in the 654 given mode is promoted. */ 655 extern enum machine_mode promote_function_mode (const_tree, enum machine_mode, int *, 656 const_tree, int); 657 658 /* Return mode and signedness to use when an object in the given mode 659 is promoted. */ 660 extern enum machine_mode promote_mode (const_tree, enum machine_mode, int *); 661 662 /* Return mode and signedness to use when object is promoted. */ 663 enum machine_mode promote_decl_mode (const_tree, int *); 664 665 /* Remove some bytes from the stack. An rtx says how many. */ 666 extern void adjust_stack (rtx); 667 668 /* Add some bytes to the stack. An rtx says how many. */ 669 extern void anti_adjust_stack (rtx); 670 671 /* Add some bytes to the stack while probing it. An rtx says how many. */ 672 extern void anti_adjust_stack_and_probe (rtx, bool); 673 674 /* This enum is used for the following two functions. */ 675 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL}; 676 677 /* Save the stack pointer at the specified level. */ 678 extern void emit_stack_save (enum save_level, rtx *); 679 680 /* Restore the stack pointer from a save area of the specified level. */ 681 extern void emit_stack_restore (enum save_level, rtx); 682 683 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */ 684 extern void update_nonlocal_goto_save_area (void); 685 686 /* Allocate some space on the stack dynamically and return its address. */ 687 extern rtx allocate_dynamic_stack_space (rtx, unsigned, unsigned, bool); 688 689 /* Emit one stack probe at ADDRESS, an address within the stack. */ 690 extern void emit_stack_probe (rtx); 691 692 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive. 693 FIRST is a constant and size is a Pmode RTX. These are offsets from 694 the current stack pointer. STACK_GROWS_DOWNWARD says whether to add 695 or subtract them from the stack pointer. */ 696 extern void probe_stack_range (HOST_WIDE_INT, rtx); 697 698 /* Return an rtx that refers to the value returned by a library call 699 in its original home. This becomes invalid if any more code is emitted. */ 700 extern rtx hard_libcall_value (enum machine_mode, rtx); 701 702 extern void store_bit_field (rtx, unsigned HOST_WIDE_INT, 703 unsigned HOST_WIDE_INT, 704 unsigned HOST_WIDE_INT, 705 unsigned HOST_WIDE_INT, 706 enum machine_mode, rtx); 707 extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT, 708 unsigned HOST_WIDE_INT, int, bool, rtx, 709 enum machine_mode, enum machine_mode); 710 extern rtx extract_low_bits (enum machine_mode, enum machine_mode, rtx); 711 extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int); 712 extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int); 713 714 extern rtx assemble_static_space (unsigned HOST_WIDE_INT); 715 extern int safe_from_p (const_rtx, tree, int); 716 extern bool split_comparison (enum rtx_code, enum machine_mode, 717 enum rtx_code *, enum rtx_code *); 718 719 /* Call this once to initialize the contents of the optabs 720 appropriately for the current target machine. */ 721 extern void init_optabs (void); 722 extern void init_all_optabs (struct target_optabs *); 723 724 /* Call this to initialize an optab function entry. */ 725 extern rtx init_one_libfunc (const char *); 726 extern rtx set_user_assembler_libfunc (const char *, const char *); 727 728 /* Build a decl for a libfunc named NAME. */ 729 extern tree build_libfunc_function (const char *); 730 731 /* Get the personality libfunc for a function decl. */ 732 rtx get_personality_function (tree); 733 734 735 /* In stmt.c */ 736 737 /* Expand a GIMPLE_SWITCH statement. */ 738 extern void expand_case (gimple); 739 740 /* Like expand_case but special-case for SJLJ exception dispatching. */ 741 extern void expand_sjlj_dispatch_table (rtx, vec<tree> ); 742 743 #endif /* GCC_EXPR_H */ 744