gcc/expr.h

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