1 /* Definitions for code generation pass of GNU compiler. 2 Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 4 Free Software Foundation, Inc. 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free 10 Software Foundation; either version 3, or (at your option) any later 11 version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 21 22 #ifndef GCC_EXPR_H 23 #define GCC_EXPR_H 24 25 /* For inhibit_defer_pop */ 26 #include "function.h" 27 /* For XEXP, GEN_INT, rtx_code */ 28 #include "rtl.h" 29 /* For optimize_size */ 30 #include "flags.h" 31 /* For host_integerp, tree_low_cst, fold_convert, size_binop, ssize_int, 32 TREE_CODE, TYPE_SIZE, int_size_in_bytes, */ 33 #include "tree.h" 34 /* For GET_MODE_BITSIZE, word_mode */ 35 #include "machmode.h" 36 37 /* The default branch cost is 1. */ 38 #ifndef BRANCH_COST 39 #define BRANCH_COST(speed_p, predictable_p) 1 40 #endif 41 42 /* This is the 4th arg to `expand_expr'. 43 EXPAND_STACK_PARM means we are possibly expanding a call param onto 44 the stack. 45 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx. 46 EXPAND_INITIALIZER is similar but also record any labels on forced_labels. 47 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address 48 is a constant that is not a legitimate address. 49 EXPAND_WRITE means we are only going to write to the resulting rtx. 50 EXPAND_MEMORY means we are interested in a memory result, even if 51 the memory is constant and we could have propagated a constant value. */ 52 enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM, 53 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE, 54 EXPAND_MEMORY}; 55 56 /* Prevent the compiler from deferring stack pops. See 57 inhibit_defer_pop for more information. */ 58 #define NO_DEFER_POP (inhibit_defer_pop += 1) 59 60 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for 61 more information. */ 62 #define OK_DEFER_POP (inhibit_defer_pop -= 1) 63 64 /* If a memory-to-memory move would take MOVE_RATIO or more simple 65 move-instruction sequences, we will do a movmem or libcall instead. */ 66 67 #ifndef MOVE_RATIO 68 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti) 69 #define MOVE_RATIO(speed) 2 70 #else 71 /* If we are optimizing for space (-Os), cut down the default move ratio. */ 72 #define MOVE_RATIO(speed) ((speed) ? 15 : 3) 73 #endif 74 #endif 75 76 /* If a clear memory operation would take CLEAR_RATIO or more simple 77 move-instruction sequences, we will do a setmem or libcall instead. */ 78 79 #ifndef CLEAR_RATIO 80 #if defined (HAVE_setmemqi) || defined (HAVE_setmemhi) || defined (HAVE_setmemsi) || defined (HAVE_setmemdi) || defined (HAVE_setmemti) 81 #define CLEAR_RATIO(speed) 2 82 #else 83 /* If we are optimizing for space, cut down the default clear ratio. */ 84 #define CLEAR_RATIO(speed) ((speed) ? 15 :3) 85 #endif 86 #endif 87 88 /* If a memory set (to value other than zero) operation would take 89 SET_RATIO or more simple move-instruction sequences, we will do a movmem 90 or libcall instead. */ 91 #ifndef SET_RATIO 92 #define SET_RATIO(speed) MOVE_RATIO(speed) 93 #endif 94 95 enum direction {none, upward, downward}; 96 97 /* Structure to record the size of a sequence of arguments 98 as the sum of a tree-expression and a constant. This structure is 99 also used to store offsets from the stack, which might be negative, 100 so the variable part must be ssizetype, not sizetype. */ 101 102 struct args_size 103 { 104 HOST_WIDE_INT constant; 105 tree var; 106 }; 107 108 /* Package up various arg related fields of struct args for 109 locate_and_pad_parm. */ 110 struct locate_and_pad_arg_data 111 { 112 /* Size of this argument on the stack, rounded up for any padding it 113 gets. If REG_PARM_STACK_SPACE is defined, then register parms are 114 counted here, otherwise they aren't. */ 115 struct args_size size; 116 /* Offset of this argument from beginning of stack-args. */ 117 struct args_size offset; 118 /* Offset to the start of the stack slot. Different from OFFSET 119 if this arg pads downward. */ 120 struct args_size slot_offset; 121 /* The amount that the stack pointer needs to be adjusted to 122 force alignment for the next argument. */ 123 struct args_size alignment_pad; 124 /* Which way we should pad this arg. */ 125 enum direction where_pad; 126 /* slot_offset is at least this aligned. */ 127 unsigned int boundary; 128 }; 129 130 /* Add the value of the tree INC to the `struct args_size' TO. */ 131 132 #define ADD_PARM_SIZE(TO, INC) \ 133 do { \ 134 tree inc = (INC); \ 135 if (host_integerp (inc, 0)) \ 136 (TO).constant += tree_low_cst (inc, 0); \ 137 else if ((TO).var == 0) \ 138 (TO).var = fold_convert (ssizetype, inc); \ 139 else \ 140 (TO).var = size_binop (PLUS_EXPR, (TO).var, \ 141 fold_convert (ssizetype, inc)); \ 142 } while (0) 143 144 #define SUB_PARM_SIZE(TO, DEC) \ 145 do { \ 146 tree dec = (DEC); \ 147 if (host_integerp (dec, 0)) \ 148 (TO).constant -= tree_low_cst (dec, 0); \ 149 else if ((TO).var == 0) \ 150 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \ 151 fold_convert (ssizetype, dec)); \ 152 else \ 153 (TO).var = size_binop (MINUS_EXPR, (TO).var, \ 154 fold_convert (ssizetype, dec)); \ 155 } while (0) 156 157 /* Convert the implicit sum in a `struct args_size' into a tree 158 of type ssizetype. */ 159 #define ARGS_SIZE_TREE(SIZE) \ 160 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \ 161 : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \ 162 ssize_int ((SIZE).constant))) 163 164 /* Convert the implicit sum in a `struct args_size' into an rtx. */ 165 #define ARGS_SIZE_RTX(SIZE) \ 166 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \ 167 : expand_normal (ARGS_SIZE_TREE (SIZE))) 168 169 /* Supply a default definition for FUNCTION_ARG_PADDING: 170 usually pad upward, but pad short args downward on 171 big-endian machines. */ 172 173 #define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \ 174 (! BYTES_BIG_ENDIAN \ 175 ? upward \ 176 : (((MODE) == BLKmode \ 177 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \ 178 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \ 179 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \ 180 ? downward : upward)) 181 182 #ifndef FUNCTION_ARG_PADDING 183 #define FUNCTION_ARG_PADDING(MODE, TYPE) \ 184 DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE)) 185 #endif 186 187 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let 188 FUNCTION_ARG_PADDING, which also pads the length, handle any needed 189 alignment. */ 190 191 #ifndef FUNCTION_ARG_BOUNDARY 192 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY 193 #endif 194 195 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save. 196 Normally move_insn, so Pmode stack pointer. */ 197 198 #ifndef STACK_SAVEAREA_MODE 199 #define STACK_SAVEAREA_MODE(LEVEL) Pmode 200 #endif 201 202 /* Supply a default definition of STACK_SIZE_MODE for 203 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */ 204 205 #ifndef STACK_SIZE_MODE 206 #define STACK_SIZE_MODE word_mode 207 #endif 208 209 /* Provide default values for the macros controlling stack checking. */ 210 211 /* The default is neither full builtin stack checking... */ 212 #ifndef STACK_CHECK_BUILTIN 213 #define STACK_CHECK_BUILTIN 0 214 #endif 215 216 /* ...nor static builtin stack checking. */ 217 #ifndef STACK_CHECK_STATIC_BUILTIN 218 #define STACK_CHECK_STATIC_BUILTIN 0 219 #endif 220 221 /* The default interval is one page (4096 bytes). */ 222 #ifndef STACK_CHECK_PROBE_INTERVAL_EXP 223 #define STACK_CHECK_PROBE_INTERVAL_EXP 12 224 #endif 225 226 /* The default is not to move the stack pointer. */ 227 #ifndef STACK_CHECK_MOVING_SP 228 #define STACK_CHECK_MOVING_SP 0 229 #endif 230 231 /* This is a kludge to try to capture the discrepancy between the old 232 mechanism (generic stack checking) and the new mechanism (static 233 builtin stack checking). STACK_CHECK_PROTECT needs to be bumped 234 for the latter because part of the protection area is effectively 235 included in STACK_CHECK_MAX_FRAME_SIZE for the former. */ 236 #ifdef STACK_CHECK_PROTECT 237 #define STACK_OLD_CHECK_PROTECT STACK_CHECK_PROTECT 238 #else 239 #define STACK_OLD_CHECK_PROTECT \ 240 (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 8 * 1024) 241 #endif 242 243 /* Minimum amount of stack required to recover from an anticipated stack 244 overflow detection. The default value conveys an estimate of the amount 245 of stack required to propagate an exception. */ 246 #ifndef STACK_CHECK_PROTECT 247 #define STACK_CHECK_PROTECT \ 248 (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 12 * 1024) 249 #endif 250 251 /* Make the maximum frame size be the largest we can and still only need 252 one probe per function. */ 253 #ifndef STACK_CHECK_MAX_FRAME_SIZE 254 #define STACK_CHECK_MAX_FRAME_SIZE \ 255 ((1 << STACK_CHECK_PROBE_INTERVAL_EXP) - UNITS_PER_WORD) 256 #endif 257 258 /* This is arbitrary, but should be large enough everywhere. */ 259 #ifndef STACK_CHECK_FIXED_FRAME_SIZE 260 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD) 261 #endif 262 263 /* Provide a reasonable default for the maximum size of an object to 264 allocate in the fixed frame. We may need to be able to make this 265 controllable by the user at some point. */ 266 #ifndef STACK_CHECK_MAX_VAR_SIZE 267 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100) 268 #endif 269 270 /* This structure is used to pass around information about exploded 271 unary, binary and trinary expressions between expand_expr_real_1 and 272 friends. */ 273 typedef struct separate_ops 274 { 275 enum tree_code code; 276 tree type; 277 tree op0, op1, op2; 278 location_t location; 279 } *sepops; 280 281 /* Functions from optabs.c, commonly used, and without need for the optabs 282 tables: */ 283 284 /* Passed to expand_simple_binop and expand_binop to say which options 285 to try to use if the requested operation can't be open-coded on the 286 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using 287 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try 288 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't 289 try anything else. */ 290 291 enum optab_methods 292 { 293 OPTAB_DIRECT, 294 OPTAB_LIB, 295 OPTAB_WIDEN, 296 OPTAB_LIB_WIDEN, 297 OPTAB_MUST_WIDEN 298 }; 299 300 /* Generate code for a simple binary or unary operation. "Simple" in 301 this case means "can be unambiguously described by a (mode, code) 302 pair and mapped to a single optab." */ 303 extern rtx expand_simple_binop (enum machine_mode, enum rtx_code, rtx, 304 rtx, rtx, int, enum optab_methods); 305 extern rtx expand_simple_unop (enum machine_mode, enum rtx_code, rtx, rtx, 306 int); 307 308 /* Report whether the machine description contains an insn which can 309 perform the operation described by CODE and MODE. */ 310 extern int have_insn_for (enum rtx_code, enum machine_mode); 311 312 extern rtx prepare_operand (int, rtx, int, enum machine_mode, enum machine_mode, 313 int); 314 315 /* Emit code to make a call to a constant function or a library call. */ 316 extern void emit_libcall_block (rtx, rtx, rtx, rtx); 317 318 /* Create but don't emit one rtl instruction to perform certain operations. 319 Modes must match; operands must meet the operation's predicates. 320 Likewise for subtraction and for just copying. */ 321 extern rtx gen_add2_insn (rtx, rtx); 322 extern rtx gen_add3_insn (rtx, rtx, rtx); 323 extern rtx gen_sub2_insn (rtx, rtx); 324 extern rtx gen_sub3_insn (rtx, rtx, rtx); 325 extern rtx gen_move_insn (rtx, rtx); 326 extern int have_add2_insn (rtx, rtx); 327 extern int have_sub2_insn (rtx, rtx); 328 329 /* Emit a pair of rtl insns to compare two rtx's and to jump 330 to a label if the comparison is true. */ 331 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx, 332 enum machine_mode, int, rtx); 333 334 /* Generate code to indirectly jump to a location given in the rtx LOC. */ 335 extern void emit_indirect_jump (rtx); 336 337 /* Generate a conditional trap instruction. */ 338 extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx); 339 340 #include "insn-config.h" 341 342 #ifdef HAVE_conditional_move 343 /* Emit a conditional move operation. */ 344 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode, 345 rtx, rtx, enum machine_mode, int); 346 347 /* Return nonzero if the conditional move is supported. */ 348 int can_conditionally_move_p (enum machine_mode mode); 349 350 #endif 351 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode, 352 rtx, rtx, enum machine_mode, int); 353 354 rtx expand_val_compare_and_swap (rtx, rtx, rtx, rtx); 355 rtx expand_bool_compare_and_swap (rtx, rtx, rtx, rtx); 356 rtx expand_sync_operation (rtx, rtx, enum rtx_code); 357 rtx expand_sync_fetch_operation (rtx, rtx, enum rtx_code, bool, rtx); 358 rtx expand_sync_lock_test_and_set (rtx, rtx, rtx); 359 360 /* Functions from expmed.c: */ 361 362 /* Arguments MODE, RTX: return an rtx for the negation of that value. 363 May emit insns. */ 364 extern rtx negate_rtx (enum machine_mode, rtx); 365 366 /* Expand a logical AND operation. */ 367 extern rtx expand_and (enum machine_mode, rtx, rtx, rtx); 368 369 /* Emit a store-flag operation. */ 370 extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode, 371 int, int); 372 373 /* Like emit_store_flag, but always succeeds. */ 374 extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx, 375 enum machine_mode, int, int); 376 377 /* Functions from builtins.c: */ 378 extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int); 379 extern tree std_build_builtin_va_list (void); 380 extern tree std_fn_abi_va_list (tree); 381 extern tree std_canonical_va_list_type (tree); 382 383 extern void std_expand_builtin_va_start (tree, rtx); 384 extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int); 385 extern void expand_builtin_setjmp_setup (rtx, rtx); 386 extern void expand_builtin_setjmp_receiver (rtx); 387 extern rtx expand_builtin_saveregs (void); 388 extern void expand_builtin_trap (void); 389 extern rtx builtin_strncpy_read_str (void *, HOST_WIDE_INT, enum machine_mode); 390 391 /* Functions from expr.c: */ 392 393 /* This is run during target initialization to set up which modes can be 394 used directly in memory and to initialize the block move optab. */ 395 extern void init_expr_target (void); 396 397 /* This is run at the start of compiling a function. */ 398 extern void init_expr (void); 399 400 /* Emit some rtl insns to move data between rtx's, converting machine modes. 401 Both modes must be floating or both fixed. */ 402 extern void convert_move (rtx, rtx, int); 403 404 /* Convert an rtx to specified machine mode and return the result. */ 405 extern rtx convert_to_mode (enum machine_mode, rtx, int); 406 407 /* Convert an rtx to MODE from OLDMODE and return the result. */ 408 extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int); 409 410 /* Emit code to move a block Y to a block X. */ 411 412 enum block_op_methods 413 { 414 BLOCK_OP_NORMAL, 415 BLOCK_OP_NO_LIBCALL, 416 BLOCK_OP_CALL_PARM, 417 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */ 418 BLOCK_OP_TAILCALL 419 }; 420 421 extern GTY(()) tree block_clear_fn; 422 extern void init_block_move_fn (const char *); 423 extern void init_block_clear_fn (const char *); 424 425 extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods); 426 extern rtx emit_block_move_via_libcall (rtx, rtx, rtx, bool); 427 extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods, 428 unsigned int, HOST_WIDE_INT); 429 extern bool emit_storent_insn (rtx to, rtx from); 430 431 /* Copy all or part of a value X into registers starting at REGNO. 432 The number of registers to be filled is NREGS. */ 433 extern void move_block_to_reg (int, rtx, int, enum machine_mode); 434 435 /* Copy all or part of a BLKmode value X out of registers starting at REGNO. 436 The number of registers to be filled is NREGS. */ 437 extern void move_block_from_reg (int, rtx, int); 438 439 /* Generate a non-consecutive group of registers represented by a PARALLEL. */ 440 extern rtx gen_group_rtx (rtx); 441 442 /* Load a BLKmode value into non-consecutive registers represented by a 443 PARALLEL. */ 444 extern void emit_group_load (rtx, rtx, tree, int); 445 446 /* Similarly, but load into new temporaries. */ 447 extern rtx emit_group_load_into_temps (rtx, rtx, tree, int); 448 449 /* Move a non-consecutive group of registers represented by a PARALLEL into 450 a non-consecutive group of registers represented by a PARALLEL. */ 451 extern void emit_group_move (rtx, rtx); 452 453 /* Move a group of registers represented by a PARALLEL into pseudos. */ 454 extern rtx emit_group_move_into_temps (rtx); 455 456 /* Store a BLKmode value from non-consecutive registers represented by a 457 PARALLEL. */ 458 extern void emit_group_store (rtx, rtx, tree, int); 459 460 /* Copy BLKmode object from a set of registers. */ 461 extern rtx copy_blkmode_from_reg (rtx, rtx, tree); 462 463 extern rtx copy_blkmode_to_reg (enum machine_mode, tree); 464 465 /* Mark REG as holding a parameter for the next CALL_INSN. */ 466 extern void use_reg (rtx *, rtx); 467 468 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters 469 for the next CALL_INSN. */ 470 extern void use_regs (rtx *, int, int); 471 472 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */ 473 extern void use_group_regs (rtx *, rtx); 474 475 /* Write zeros through the storage of OBJECT. 476 If OBJECT has BLKmode, SIZE is its length in bytes. */ 477 extern rtx clear_storage (rtx, rtx, enum block_op_methods); 478 extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods, 479 unsigned int, HOST_WIDE_INT); 480 /* The same, but always output an library call. */ 481 rtx set_storage_via_libcall (rtx, rtx, rtx, bool); 482 483 /* Expand a setmem pattern; return true if successful. */ 484 extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int, 485 unsigned int, HOST_WIDE_INT); 486 487 /* Determine whether the LEN bytes can be moved by using several move 488 instructions. Return nonzero if a call to move_by_pieces should 489 succeed. */ 490 extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int); 491 492 /* Return nonzero if it is desirable to store LEN bytes generated by 493 CONSTFUN with several move instructions by store_by_pieces 494 function. CONSTFUNDATA is a pointer which will be passed as argument 495 in every CONSTFUN call. 496 ALIGN is maximum alignment we can assume. 497 MEMSETP is true if this is a real memset/bzero, not a copy 498 of a const string. */ 499 extern int can_store_by_pieces (unsigned HOST_WIDE_INT, 500 rtx (*) (void *, HOST_WIDE_INT, 501 enum machine_mode), 502 void *, unsigned int, bool); 503 504 /* Generate several move instructions to store LEN bytes generated by 505 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a 506 pointer which will be passed as argument in every CONSTFUN call. 507 ALIGN is maximum alignment we can assume. 508 MEMSETP is true if this is a real memset/bzero, not a copy. 509 Returns TO + LEN. */ 510 extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, 511 rtx (*) (void *, HOST_WIDE_INT, enum machine_mode), 512 void *, unsigned int, bool, int); 513 514 /* Emit insns to set X from Y. */ 515 extern rtx emit_move_insn (rtx, rtx); 516 517 /* Emit insns to set X from Y, with no frills. */ 518 extern rtx emit_move_insn_1 (rtx, rtx); 519 520 extern rtx emit_move_complex_push (enum machine_mode, rtx, rtx); 521 extern rtx emit_move_complex_parts (rtx, rtx); 522 523 /* Push a block of length SIZE (perhaps variable) 524 and return an rtx to address the beginning of the block. */ 525 extern rtx push_block (rtx, int, int); 526 527 /* Generate code to push something onto the stack, given its mode and type. */ 528 extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int, 529 int, rtx, int, rtx, rtx, int, rtx); 530 531 /* Expand an assignment that stores the value of FROM into TO. */ 532 extern void expand_assignment (tree, tree, bool); 533 534 /* Generate code for computing expression EXP, 535 and storing the value into TARGET. 536 If SUGGEST_REG is nonzero, copy the value through a register 537 and return that register, if that is possible. */ 538 extern rtx store_expr (tree, rtx, int, bool); 539 540 /* Given an rtx that may include add and multiply operations, 541 generate them as insns and return a pseudo-reg containing the value. 542 Useful after calling expand_expr with 1 as sum_ok. */ 543 extern rtx force_operand (rtx, rtx); 544 545 /* Work horses for expand_expr. */ 546 extern rtx expand_expr_real (tree, rtx, enum machine_mode, 547 enum expand_modifier, rtx *); 548 extern rtx expand_expr_real_1 (tree, rtx, enum machine_mode, 549 enum expand_modifier, rtx *); 550 extern rtx expand_expr_real_2 (sepops, rtx, enum machine_mode, 551 enum expand_modifier); 552 553 /* Generate code for computing expression EXP. 554 An rtx for the computed value is returned. The value is never null. 555 In the case of a void EXP, const0_rtx is returned. */ 556 static inline rtx 557 expand_expr (tree exp, rtx target, enum machine_mode mode, 558 enum expand_modifier modifier) 559 { 560 return expand_expr_real (exp, target, mode, modifier, NULL); 561 } 562 563 static inline rtx 564 expand_normal (tree exp) 565 { 566 return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL); 567 } 568 569 /* At the start of a function, record that we have no previously-pushed 570 arguments waiting to be popped. */ 571 extern void init_pending_stack_adjust (void); 572 573 /* Discard any pending stack adjustment. */ 574 extern void discard_pending_stack_adjust (void); 575 576 /* When exiting from function, if safe, clear out any pending stack adjust 577 so the adjustment won't get done. */ 578 extern void clear_pending_stack_adjust (void); 579 580 /* Pop any previously-pushed arguments that have not been popped yet. */ 581 extern void do_pending_stack_adjust (void); 582 583 /* Return the tree node and offset if a given argument corresponds to 584 a string constant. */ 585 extern tree string_constant (tree, tree *); 586 587 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */ 588 extern void jumpifnot (tree, rtx, int); 589 extern void jumpifnot_1 (enum tree_code, tree, tree, rtx, int); 590 591 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */ 592 extern void jumpif (tree, rtx, int); 593 extern void jumpif_1 (enum tree_code, tree, tree, rtx, int); 594 595 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if 596 the result is zero, or IF_TRUE_LABEL if the result is one. */ 597 extern void do_jump (tree, rtx, rtx, int); 598 extern void do_jump_1 (enum tree_code, tree, tree, rtx, rtx, int); 599 600 extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int, 601 enum machine_mode, rtx, rtx, rtx, int); 602 603 /* Two different ways of generating switch statements. */ 604 extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx); 605 extern int try_tablejump (tree, tree, tree, tree, rtx, rtx); 606 607 /* Functions from alias.c */ 608 #include "alias.h" 609 610 611 /* rtl.h and tree.h were included. */ 612 /* Return an rtx for the size in bytes of the value of an expr. */ 613 extern rtx expr_size (tree); 614 615 /* Return a wide integer for the size in bytes of the value of EXP, or -1 616 if the size can vary or is larger than an integer. */ 617 extern HOST_WIDE_INT int_expr_size (tree); 618 619 /* Return an rtx that refers to the value returned by a function 620 in its original home. This becomes invalid if any more code is emitted. */ 621 extern rtx hard_function_value (const_tree, const_tree, const_tree, int); 622 623 extern rtx prepare_call_address (tree, rtx, rtx, rtx *, int, int); 624 625 extern bool shift_return_value (enum machine_mode, bool, rtx); 626 627 extern rtx expand_call (tree, rtx, int); 628 629 extern void fixup_tail_calls (void); 630 631 #ifdef TREE_CODE 632 extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, tree, rtx, 633 int); 634 extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx, 635 rtx, int); 636 #endif 637 638 extern void locate_and_pad_parm (enum machine_mode, tree, int, int, tree, 639 struct args_size *, 640 struct locate_and_pad_arg_data *); 641 642 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */ 643 extern rtx label_rtx (tree); 644 645 /* As label_rtx, but additionally the label is placed on the forced label 646 list of its containing function (i.e. it is treated as reachable even 647 if how is not obvious). */ 648 extern rtx force_label_rtx (tree); 649 650 /* Return an rtx like arg but sans any constant terms. 651 Returns the original rtx if it has no constant terms. 652 The constant terms are added and stored via a second arg. */ 653 extern rtx eliminate_constant_term (rtx, rtx *); 654 655 /* Convert arg to a valid memory address for specified machine mode that points 656 to a specific named address space, by emitting insns to perform arithmetic 657 if necessary. */ 658 extern rtx memory_address_addr_space (enum machine_mode, rtx, addr_space_t); 659 660 /* Like memory_address_addr_space, except assume the memory address points to 661 the generic named address space. */ 662 #define memory_address(MODE,RTX) \ 663 memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC) 664 665 /* Return a memory reference like MEMREF, but with its mode changed 666 to MODE and its address changed to ADDR. 667 (VOIDmode means don't change the mode. 668 NULL for ADDR means don't change the address.) */ 669 extern rtx change_address (rtx, enum machine_mode, rtx); 670 671 /* Return a memory reference like MEMREF, but with its mode changed 672 to MODE and its address offset by OFFSET bytes. */ 673 #define adjust_address(MEMREF, MODE, OFFSET) \ 674 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1) 675 676 /* Likewise, but the reference is not required to be valid. */ 677 #define adjust_address_nv(MEMREF, MODE, OFFSET) \ 678 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1) 679 680 /* Return a memory reference like MEMREF, but with its mode changed 681 to MODE and its address changed to ADDR, which is assumed to be 682 increased by OFFSET bytes from MEMREF. */ 683 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \ 684 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1) 685 686 /* Likewise, but the reference is not required to be valid. */ 687 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \ 688 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0) 689 690 extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int); 691 extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx, 692 HOST_WIDE_INT, int); 693 694 /* Return a memory reference like MEMREF, but whose address is changed by 695 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor 696 known to be in OFFSET (possibly 1). */ 697 extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT); 698 699 /* Definitions from emit-rtl.c */ 700 #include "emit-rtl.h" 701 702 /* Return a memory reference like MEMREF, but with its mode widened to 703 MODE and adjusted by OFFSET. */ 704 extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT); 705 706 /* Return a memory reference like MEMREF, but which is known to have a 707 valid address. */ 708 extern rtx validize_mem (rtx); 709 710 extern rtx use_anchored_address (rtx); 711 712 /* Given REF, a MEM, and T, either the type of X or the expression 713 corresponding to REF, set the memory attributes. OBJECTP is nonzero 714 if we are making a new object of this type. */ 715 extern void set_mem_attributes (rtx, tree, int); 716 717 /* Similar, except that BITPOS has not yet been applied to REF, so if 718 we alter MEM_OFFSET according to T then we should subtract BITPOS 719 expecting that it'll be added back in later. */ 720 extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT); 721 722 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN 723 bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or 724 -1 if not known. */ 725 extern int get_mem_align_offset (rtx, unsigned int); 726 727 /* Assemble the static constant template for function entry trampolines. */ 728 extern rtx assemble_trampoline_template (void); 729 730 /* Copy given rtx to a new temp reg and return that. */ 731 extern rtx copy_to_reg (rtx); 732 733 /* Like copy_to_reg but always make the reg Pmode. */ 734 extern rtx copy_addr_to_reg (rtx); 735 736 /* Like copy_to_reg but always make the reg the specified mode MODE. */ 737 extern rtx copy_to_mode_reg (enum machine_mode, rtx); 738 739 /* Copy given rtx to given temp reg and return that. */ 740 extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode); 741 742 /* Copy a value to a register if it isn't already a register. 743 Args are mode (in case value is a constant) and the value. */ 744 extern rtx force_reg (enum machine_mode, rtx); 745 746 /* Return given rtx, copied into a new temp reg if it was in memory. */ 747 extern rtx force_not_mem (rtx); 748 749 /* Return mode and signedness to use when an argument or result in the 750 given mode is promoted. */ 751 extern enum machine_mode promote_function_mode (const_tree, enum machine_mode, int *, 752 const_tree, int); 753 754 /* Return mode and signedness to use when an object in the given mode 755 is promoted. */ 756 extern enum machine_mode promote_mode (const_tree, enum machine_mode, int *); 757 758 /* Return mode and signedness to use when object is promoted. */ 759 enum machine_mode promote_decl_mode (const_tree, int *); 760 761 /* Remove some bytes from the stack. An rtx says how many. */ 762 extern void adjust_stack (rtx); 763 764 /* Add some bytes to the stack. An rtx says how many. */ 765 extern void anti_adjust_stack (rtx); 766 767 /* Add some bytes to the stack while probing it. An rtx says how many. */ 768 extern void anti_adjust_stack_and_probe (rtx, bool); 769 770 /* This enum is used for the following two functions. */ 771 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL}; 772 773 /* Save the stack pointer at the specified level. */ 774 extern void emit_stack_save (enum save_level, rtx *, rtx); 775 776 /* Restore the stack pointer from a save area of the specified level. */ 777 extern void emit_stack_restore (enum save_level, rtx, rtx); 778 779 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */ 780 extern void update_nonlocal_goto_save_area (void); 781 782 /* Allocate some space on the stack dynamically and return its address. An rtx 783 says how many bytes. */ 784 extern rtx allocate_dynamic_stack_space (rtx, rtx, int); 785 786 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive. 787 FIRST is a constant and size is a Pmode RTX. These are offsets from 788 the current stack pointer. STACK_GROWS_DOWNWARD says whether to add 789 or subtract them from the stack pointer. */ 790 extern void probe_stack_range (HOST_WIDE_INT, rtx); 791 792 /* Return an rtx that refers to the value returned by a library call 793 in its original home. This becomes invalid if any more code is emitted. */ 794 extern rtx hard_libcall_value (enum machine_mode, rtx); 795 796 /* Return the mode desired by operand N of a particular bitfield 797 insert/extract insn, or MAX_MACHINE_MODE if no such insn is 798 available. */ 799 800 enum extraction_pattern { EP_insv, EP_extv, EP_extzv }; 801 extern enum machine_mode 802 mode_for_extraction (enum extraction_pattern, int); 803 804 extern void store_bit_field (rtx, unsigned HOST_WIDE_INT, 805 unsigned HOST_WIDE_INT, enum machine_mode, rtx); 806 extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT, 807 unsigned HOST_WIDE_INT, int, rtx, 808 enum machine_mode, enum machine_mode); 809 extern rtx extract_low_bits (enum machine_mode, enum machine_mode, rtx); 810 extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int); 811 extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int); 812 813 extern rtx assemble_static_space (unsigned HOST_WIDE_INT); 814 extern int safe_from_p (const_rtx, tree, int); 815 extern bool split_comparison (enum rtx_code, enum machine_mode, 816 enum rtx_code *, enum rtx_code *); 817 818 /* Call this once to initialize the contents of the optabs 819 appropriately for the current target machine. */ 820 extern void init_optabs (void); 821 extern void init_all_optabs (void); 822 823 /* Call this to initialize an optab function entry. */ 824 extern rtx init_one_libfunc (const char *); 825 extern rtx set_user_assembler_libfunc (const char *, const char *); 826 827 /* Build a decl for a libfunc named NAME. */ 828 extern tree build_libfunc_function (const char *); 829 830 /* Get the personality libfunc for a function decl. */ 831 rtx get_personality_function (tree); 832 833 extern int vector_mode_valid_p (enum machine_mode); 834 835 #endif /* GCC_EXPR_H */ 836