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 tree_fits_[su]hwi_p, tree_to_[su]hwi, fold_convert, size_binop,
  30    ssize_int, TREE_CODE, TYPE_SIZE, int_size_in_bytes,    */
  31 #include "tree-core.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 enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM,
  46                       EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE,
  47                       EXPAND_MEMORY};
  48
  49 /* Prevent the compiler from deferring stack pops.  See
  50    inhibit_defer_pop for more information.  */
  51 #define NO_DEFER_POP (inhibit_defer_pop += 1)
  52
  53 /* Allow the compiler to defer stack pops.  See inhibit_defer_pop for
  54    more information.  */
  55 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
  56 \f
  57 enum direction {none, upward, downward};
  58
  59 /* Structure to record the size of a sequence of arguments
  60    as the sum of a tree-expression and a constant.  This structure is
  61    also used to store offsets from the stack, which might be negative,
  62    so the variable part must be ssizetype, not sizetype.  */
  63
  64 struct args_size
  65 {
  66   HOST_WIDE_INT constant;
  67   tree var;
  68 };
  69
  70 /* Package up various arg related fields of struct args for
  71    locate_and_pad_parm.  */
  72 struct locate_and_pad_arg_data
  73 {
  74   /* Size of this argument on the stack, rounded up for any padding it
  75      gets.  If REG_PARM_STACK_SPACE is defined, then register parms are
  76      counted here, otherwise they aren't.  */
  77   struct args_size size;
  78   /* Offset of this argument from beginning of stack-args.  */
  79   struct args_size offset;
  80   /* Offset to the start of the stack slot.  Different from OFFSET
  81      if this arg pads downward.  */
  82   struct args_size slot_offset;
  83   /* The amount that the stack pointer needs to be adjusted to
  84      force alignment for the next argument.  */
  85   struct args_size alignment_pad;
  86   /* Which way we should pad this arg.  */
  87   enum direction where_pad;
  88   /* slot_offset is at least this aligned.  */
  89   unsigned int boundary;
  90 };
  91
  92 /* Add the value of the tree INC to the `struct args_size' TO.  */
  93
  94 #define ADD_PARM_SIZE(TO, INC)                                  \
  95 do {                                                            \
  96   tree inc = (INC);                                             \
  97   if (tree_fits_shwi_p (inc))                                   \
  98     (TO).constant += tree_to_shwi (inc);                        \
  99   else if ((TO).var == 0)                                       \
 100     (TO).var = fold_convert (ssizetype, inc);                   \
 101   else                                                          \
 102     (TO).var = size_binop (PLUS_EXPR, (TO).var,                 \
 103                            fold_convert (ssizetype, inc));      \
 104 } while (0)
 105
 106 #define SUB_PARM_SIZE(TO, DEC)                                  \
 107 do {                                                            \
 108   tree dec = (DEC);                                             \
 109   if (tree_fits_shwi_p (dec))                                   \
 110     (TO).constant -= tree_to_shwi (dec);                        \
 111   else if ((TO).var == 0)                                       \
 112     (TO).var = size_binop (MINUS_EXPR, ssize_int (0),           \
 113                            fold_convert (ssizetype, dec));      \
 114   else                                                          \
 115     (TO).var = size_binop (MINUS_EXPR, (TO).var,                \
 116                            fold_convert (ssizetype, dec));      \
 117 } while (0)
 118
 119 /* Convert the implicit sum in a `struct args_size' into a tree
 120    of type ssizetype.  */
 121 #define ARGS_SIZE_TREE(SIZE)                                    \
 122 ((SIZE).var == 0 ? ssize_int ((SIZE).constant)                  \
 123  : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \
 124                ssize_int ((SIZE).constant)))
 125
 126 /* Convert the implicit sum in a `struct args_size' into an rtx.  */
 127 #define ARGS_SIZE_RTX(SIZE)                                     \
 128 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant)                    \
 129  : expand_normal (ARGS_SIZE_TREE (SIZE)))
 130
 131 \f
 132 /* This structure is used to pass around information about exploded
 133    unary, binary and trinary expressions between expand_expr_real_1 and
 134    friends.  */
 135 typedef struct separate_ops
 136 {
 137   enum tree_code code;
 138   location_t location;
 139   tree type;
 140   tree op0, op1, op2;
 141 } *sepops;
 142 \f
 143 /* Functions from optabs.c, commonly used, and without need for the optabs
 144    tables:  */
 145
 146 /* Passed to expand_simple_binop and expand_binop to say which options
 147    to try to use if the requested operation can't be open-coded on the
 148    requisite mode.  Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
 149    a library call.  Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
 150    using a wider mode.  OPTAB_MUST_WIDEN says try widening and don't
 151    try anything else.  */
 152
 153 enum optab_methods
 154 {
 155   OPTAB_DIRECT,
 156   OPTAB_LIB,
 157   OPTAB_WIDEN,
 158   OPTAB_LIB_WIDEN,
 159   OPTAB_MUST_WIDEN
 160 };
 161
 162 /* Generate code for a simple binary or unary operation.  "Simple" in
 163    this case means "can be unambiguously described by a (mode, code)
 164    pair and mapped to a single optab."  */
 165 extern rtx expand_simple_binop (enum machine_mode, enum rtx_code, rtx,
 166                                 rtx, rtx, int, enum optab_methods);
 167 extern rtx expand_simple_unop (enum machine_mode, enum rtx_code, rtx, rtx,
 168                                int);
 169
 170 /* Report whether the machine description contains an insn which can
 171    perform the operation described by CODE and MODE.  */
 172 extern int have_insn_for (enum rtx_code, enum machine_mode);
 173
 174 /* Emit code to make a call to a constant function or a library call.  */
 175 extern void emit_libcall_block (rtx, rtx, rtx, rtx);
 176
 177 /* Create but don't emit one rtl instruction to perform certain operations.
 178    Modes must match; operands must meet the operation's predicates.
 179    Likewise for subtraction and for just copying.  */
 180 extern rtx gen_add2_insn (rtx, rtx);
 181 extern rtx gen_add3_insn (rtx, rtx, rtx);
 182 extern rtx gen_sub2_insn (rtx, rtx);
 183 extern rtx gen_sub3_insn (rtx, rtx, rtx);
 184 extern rtx gen_move_insn (rtx, rtx);
 185 extern int have_add2_insn (rtx, rtx);
 186 extern int have_sub2_insn (rtx, rtx);
 187
 188 /* Emit a pair of rtl insns to compare two rtx's and to jump
 189    to a label if the comparison is true.  */
 190 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
 191                                      enum machine_mode, int, rtx, int prob=-1);
 192
 193 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 194 extern void emit_indirect_jump (rtx);
 195
 196 /* Generate a conditional trap instruction.  */
 197 extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
 198
 199 #include "insn-config.h"
 200
 201 #ifdef HAVE_conditional_move
 202 /* Emit a conditional move operation.  */
 203 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
 204                            rtx, rtx, enum machine_mode, int);
 205
 206 /* Return nonzero if the conditional move is supported.  */
 207 int can_conditionally_move_p (enum machine_mode mode);
 208
 209 #endif
 210 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
 211                           rtx, rtx, enum machine_mode, int);
 212
 213 rtx expand_sync_operation (rtx, rtx, enum rtx_code);
 214 rtx expand_sync_fetch_operation (rtx, rtx, enum rtx_code, bool, rtx);
 215 rtx expand_sync_lock_test_and_set (rtx, rtx, rtx);
 216
 217 rtx expand_atomic_exchange (rtx, rtx, rtx, enum memmodel);
 218 rtx expand_atomic_load (rtx, rtx, enum memmodel);
 219 rtx expand_atomic_store (rtx, rtx, enum memmodel, bool);
 220 rtx expand_atomic_fetch_op (rtx, rtx, rtx, enum rtx_code, enum memmodel,
 221                               bool);
 222 rtx expand_atomic_test_and_set (rtx, rtx, enum memmodel);
 223 rtx expand_atomic_clear (rtx, enum memmodel);
 224 void expand_atomic_thread_fence (enum memmodel);
 225 void expand_atomic_signal_fence (enum memmodel);
 226
 227 \f
 228 /* Functions from expmed.c:  */
 229
 230 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 231    May emit insns.  */
 232 extern rtx negate_rtx (enum machine_mode, rtx);
 233
 234 /* Expand a logical AND operation.  */
 235 extern rtx expand_and (enum machine_mode, rtx, rtx, rtx);
 236
 237 /* Emit a store-flag operation.  */
 238 extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
 239                             int, int);
 240
 241 /* Like emit_store_flag, but always succeeds.  */
 242 extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx,
 243                                   enum machine_mode, int, int);
 244
 245 /* Choose a minimal N + 1 bit approximation to 1/D that can be used to
 246    replace division by D, and put the least significant N bits of the result
 247    in *MULTIPLIER_PTR and return the most significant bit.  */
 248 extern unsigned HOST_WIDE_INT choose_multiplier (unsigned HOST_WIDE_INT, int,
 249                                                  int, unsigned HOST_WIDE_INT *,
 250                                                  int *, int *);
 251 \f
 252 /* Functions from builtins.c:  */
 253 extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int);
 254 extern tree std_build_builtin_va_list (void);
 255 extern tree std_fn_abi_va_list (tree);
 256 extern tree std_canonical_va_list_type (tree);
 257
 258 extern void std_expand_builtin_va_start (tree, rtx);
 259 extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int);
 260 extern void expand_builtin_setjmp_setup (rtx, rtx);
 261 extern void expand_builtin_setjmp_receiver (rtx);
 262 extern rtx expand_builtin_saveregs (void);
 263 extern void expand_builtin_trap (void);
 264 extern rtx builtin_strncpy_read_str (void *, HOST_WIDE_INT, enum machine_mode);
 265 \f
 266 /* Functions from expr.c:  */
 267
 268 /* This is run during target initialization to set up which modes can be
 269    used directly in memory and to initialize the block move optab.  */
 270 extern void init_expr_target (void);
 271
 272 /* This is run at the start of compiling a function.  */
 273 extern void init_expr (void);
 274
 275 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 276    Both modes must be floating or both fixed.  */
 277 extern void convert_move (rtx, rtx, int);
 278
 279 /* Convert an rtx to specified machine mode and return the result.  */
 280 extern rtx convert_to_mode (enum machine_mode, rtx, int);
 281
 282 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 283 extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int);
 284
 285 /* Emit code to move a block Y to a block X.  */
 286
 287 enum block_op_methods
 288 {
 289   BLOCK_OP_NORMAL,
 290   BLOCK_OP_NO_LIBCALL,
 291   BLOCK_OP_CALL_PARM,
 292   /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized.  */
 293   BLOCK_OP_TAILCALL
 294 };
 295
 296 extern GTY(()) tree block_clear_fn;
 297 extern void init_block_move_fn (const char *);
 298 extern void init_block_clear_fn (const char *);
 299
 300 extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
 301 extern rtx emit_block_move_via_libcall (rtx, rtx, rtx, bool);
 302 extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods,
 303                                   unsigned int, HOST_WIDE_INT,
 304                                   unsigned HOST_WIDE_INT,
 305                                   unsigned HOST_WIDE_INT);
 306 extern bool emit_storent_insn (rtx to, rtx from);
 307
 308 /* Copy all or part of a value X into registers starting at REGNO.
 309    The number of registers to be filled is NREGS.  */
 310 extern void move_block_to_reg (int, rtx, int, enum machine_mode);
 311
 312 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 313    The number of registers to be filled is NREGS.  */
 314 extern void move_block_from_reg (int, rtx, int);
 315
 316 /* Generate a non-consecutive group of registers represented by a PARALLEL.  */
 317 extern rtx gen_group_rtx (rtx);
 318
 319 /* Load a BLKmode value into non-consecutive registers represented by a
 320    PARALLEL.  */
 321 extern void emit_group_load (rtx, rtx, tree, int);
 322
 323 /* Similarly, but load into new temporaries.  */
 324 extern rtx emit_group_load_into_temps (rtx, rtx, tree, int);
 325
 326 /* Move a non-consecutive group of registers represented by a PARALLEL into
 327    a non-consecutive group of registers represented by a PARALLEL.  */
 328 extern void emit_group_move (rtx, rtx);
 329
 330 /* Move a group of registers represented by a PARALLEL into pseudos.  */
 331 extern rtx emit_group_move_into_temps (rtx);
 332
 333 /* Store a BLKmode value from non-consecutive registers represented by a
 334    PARALLEL.  */
 335 extern void emit_group_store (rtx, rtx, tree, int);
 336
 337 extern rtx maybe_emit_group_store (rtx, tree);
 338
 339 /* Copy BLKmode object from a set of registers.  */
 340 extern void copy_blkmode_from_reg (rtx, rtx, tree);
 341
 342 /* Mark REG as holding a parameter for the next CALL_INSN.
 343    Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode.  */
 344 extern void use_reg_mode (rtx *, rtx, enum machine_mode);
 345
 346 extern rtx copy_blkmode_to_reg (enum machine_mode, tree);
 347
 348 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 349 static inline void
 350 use_reg (rtx *fusage, rtx reg)
 351 {
 352   use_reg_mode (fusage, reg, VOIDmode);
 353 }
 354
 355 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 356    for the next CALL_INSN.  */
 357 extern void use_regs (rtx *, int, int);
 358
 359 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
 360 extern void use_group_regs (rtx *, rtx);
 361
 362 /* Write zeros through the storage of OBJECT.
 363    If OBJECT has BLKmode, SIZE is its length in bytes.  */
 364 extern rtx clear_storage (rtx, rtx, enum block_op_methods);
 365 extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods,
 366                                 unsigned int, HOST_WIDE_INT,
 367                                 unsigned HOST_WIDE_INT,
 368                                 unsigned HOST_WIDE_INT);
 369 /* The same, but always output an library call.  */
 370 rtx set_storage_via_libcall (rtx, rtx, rtx, bool);
 371
 372 /* Expand a setmem pattern; return true if successful.  */
 373 extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int,
 374                                     unsigned int, HOST_WIDE_INT,
 375                                     unsigned HOST_WIDE_INT,
 376                                     unsigned HOST_WIDE_INT);
 377
 378 extern unsigned HOST_WIDE_INT move_by_pieces_ninsns (unsigned HOST_WIDE_INT,
 379                                                      unsigned int,
 380                                                      unsigned int);
 381
 382 /* Return nonzero if it is desirable to store LEN bytes generated by
 383    CONSTFUN with several move instructions by store_by_pieces
 384    function.  CONSTFUNDATA is a pointer which will be passed as argument
 385    in every CONSTFUN call.
 386    ALIGN is maximum alignment we can assume.
 387    MEMSETP is true if this is a real memset/bzero, not a copy
 388    of a const string.  */
 389 extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
 390                                 rtx (*) (void *, HOST_WIDE_INT,
 391                                          enum machine_mode),
 392                                 void *, unsigned int, bool);
 393
 394 /* Generate several move instructions to store LEN bytes generated by
 395    CONSTFUN to block TO.  (A MEM rtx with BLKmode).  CONSTFUNDATA is a
 396    pointer which will be passed as argument in every CONSTFUN call.
 397    ALIGN is maximum alignment we can assume.
 398    MEMSETP is true if this is a real memset/bzero, not a copy.
 399    Returns TO + LEN.  */
 400 extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT,
 401                             rtx (*) (void *, HOST_WIDE_INT, enum machine_mode),
 402                             void *, unsigned int, bool, int);
 403
 404 /* Emit insns to set X from Y.  */
 405 extern rtx emit_move_insn (rtx, rtx);
 406
 407 /* Emit insns to set X from Y, with no frills.  */
 408 extern rtx emit_move_insn_1 (rtx, rtx);
 409
 410 extern rtx emit_move_complex_push (enum machine_mode, rtx, rtx);
 411 extern rtx emit_move_complex_parts (rtx, rtx);
 412
 413 /* Push a block of length SIZE (perhaps variable)
 414    and return an rtx to address the beginning of the block.  */
 415 extern rtx push_block (rtx, int, int);
 416
 417 /* Generate code to push something onto the stack, given its mode and type.  */
 418 extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int,
 419                             int, rtx, int, rtx, rtx, int, rtx);
 420
 421 /* Expand an assignment that stores the value of FROM into TO.  */
 422 extern void expand_assignment (tree, tree, bool);
 423
 424 /* Generate code for computing expression EXP,
 425    and storing the value into TARGET.
 426    If SUGGEST_REG is nonzero, copy the value through a register
 427    and return that register, if that is possible.  */
 428 extern rtx store_expr (tree, rtx, int, bool);
 429
 430 /* Given an rtx that may include add and multiply operations,
 431    generate them as insns and return a pseudo-reg containing the value.
 432    Useful after calling expand_expr with 1 as sum_ok.  */
 433 extern rtx force_operand (rtx, rtx);
 434
 435 /* Work horses for expand_expr.  */
 436 extern rtx expand_expr_real (tree, rtx, enum machine_mode,
 437                              enum expand_modifier, rtx *);
 438 extern rtx expand_expr_real_1 (tree, rtx, enum machine_mode,
 439                                enum expand_modifier, rtx *);
 440 extern rtx expand_expr_real_2 (sepops, rtx, enum machine_mode,
 441                                enum expand_modifier);
 442
 443 /* Generate code for computing expression EXP.
 444    An rtx for the computed value is returned.  The value is never null.
 445    In the case of a void EXP, const0_rtx is returned.  */
 446 static inline rtx
 447 expand_expr (tree exp, rtx target, enum machine_mode mode,
 448              enum expand_modifier modifier)
 449 {
 450   return expand_expr_real (exp, target, mode, modifier, NULL);
 451 }
 452
 453 static inline rtx
 454 expand_normal (tree exp)
 455 {
 456   return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL);
 457 }
 458
 459 /* At the start of a function, record that we have no previously-pushed
 460    arguments waiting to be popped.  */
 461 extern void init_pending_stack_adjust (void);
 462
 463 /* Discard any pending stack adjustment.  */
 464 extern void discard_pending_stack_adjust (void);
 465
 466 /* When exiting from function, if safe, clear out any pending stack adjust
 467    so the adjustment won't get done.  */
 468 extern void clear_pending_stack_adjust (void);
 469
 470 /* Pop any previously-pushed arguments that have not been popped yet.  */
 471 extern void do_pending_stack_adjust (void);
 472
 473 /* Return the tree node and offset if a given argument corresponds to
 474    a string constant.  */
 475 extern tree string_constant (tree, tree *);
 476
 477 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
 478 extern void jumpifnot (tree, rtx, int);
 479 extern void jumpifnot_1 (enum tree_code, tree, tree, rtx, int);
 480
 481 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
 482 extern void jumpif (tree, rtx, int);
 483 extern void jumpif_1 (enum tree_code, tree, tree, rtx, int);
 484
 485 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
 486    the result is zero, or IF_TRUE_LABEL if the result is one.  */
 487 extern void do_jump (tree, rtx, rtx, int);
 488 extern void do_jump_1 (enum tree_code, tree, tree, rtx, rtx, int);
 489
 490 extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int,
 491                                      enum machine_mode, rtx, rtx, rtx, int);
 492
 493 /* Two different ways of generating switch statements.  */
 494 extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx, int);
 495 extern int try_tablejump (tree, tree, tree, tree, rtx, rtx, int);
 496
 497 /* Functions from alias.c */
 498 #include "alias.h"
 499
 500 \f
 501 /* rtl.h and tree.h were included.  */
 502 /* Return an rtx for the size in bytes of the value of an expr.  */
 503 extern rtx expr_size (tree);
 504
 505 /* Return a wide integer for the size in bytes of the value of EXP, or -1
 506    if the size can vary or is larger than an integer.  */
 507 extern HOST_WIDE_INT int_expr_size (tree);
 508
 509 /* Return an rtx that refers to the value returned by a function
 510    in its original home.  This becomes invalid if any more code is emitted.  */
 511 extern rtx hard_function_value (const_tree, const_tree, const_tree, int);
 512
 513 extern rtx prepare_call_address (tree, rtx, rtx, rtx *, int, int);
 514
 515 extern bool shift_return_value (enum machine_mode, bool, rtx);
 516
 517 extern rtx expand_call (tree, rtx, int);
 518
 519 extern void fixup_tail_calls (void);
 520
 521 #ifdef TREE_CODE
 522 extern rtx expand_variable_shift (enum tree_code, enum machine_mode,
 523                                   rtx, tree, rtx, int);
 524 extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, int, rtx,
 525                              int);
 526 extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx,
 527                           rtx, int);
 528 #endif
 529
 530 extern void locate_and_pad_parm (enum machine_mode, tree, int, int, int,
 531                                  tree, struct args_size *,
 532                                  struct locate_and_pad_arg_data *);
 533
 534 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
 535 extern rtx label_rtx (tree);
 536
 537 /* As label_rtx, but additionally the label is placed on the forced label
 538    list of its containing function (i.e. it is treated as reachable even
 539    if how is not obvious).  */
 540 extern rtx force_label_rtx (tree);
 541
 542 /* Return an rtx like arg but sans any constant terms.
 543    Returns the original rtx if it has no constant terms.
 544    The constant terms are added and stored via a second arg.  */
 545 extern rtx eliminate_constant_term (rtx, rtx *);
 546
 547 /* Convert arg to a valid memory address for specified machine mode that points
 548    to a specific named address space, by emitting insns to perform arithmetic
 549    if necessary.  */
 550 extern rtx memory_address_addr_space (enum machine_mode, rtx, addr_space_t);
 551
 552 /* Like memory_address_addr_space, except assume the memory address points to
 553    the generic named address space.  */
 554 #define memory_address(MODE,RTX) \
 555         memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC)
 556
 557 /* Return a memory reference like MEMREF, but with its mode changed
 558    to MODE and its address changed to ADDR.
 559    (VOIDmode means don't change the mode.
 560    NULL for ADDR means don't change the address.)  */
 561 extern rtx change_address (rtx, enum machine_mode, rtx);
 562
 563 /* Return a memory reference like MEMREF, but with its mode changed
 564    to MODE and its address offset by OFFSET bytes.  */
 565 #define adjust_address(MEMREF, MODE, OFFSET) \
 566   adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 0, 0)
 567
 568 /* Likewise, but the reference is not required to be valid.  */
 569 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
 570   adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1, 0, 0)
 571
 572 /* Return a memory reference like MEMREF, but with its mode changed
 573    to MODE and its address offset by OFFSET bytes.  Assume that it's
 574    for a bitfield and conservatively drop the underlying object if we
 575    cannot be sure to stay within its bounds.  */
 576 #define adjust_bitfield_address(MEMREF, MODE, OFFSET) \
 577   adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 1, 0)
 578
 579 /* As for adjust_bitfield_address, but specify that the width of
 580    BLKmode accesses is SIZE bytes.  */
 581 #define adjust_bitfield_address_size(MEMREF, MODE, OFFSET, SIZE) \
 582   adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 1, SIZE)
 583
 584 /* Likewise, but the reference is not required to be valid.  */
 585 #define adjust_bitfield_address_nv(MEMREF, MODE, OFFSET) \
 586   adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1, 1, 0)
 587
 588 /* Return a memory reference like MEMREF, but with its mode changed
 589    to MODE and its address changed to ADDR, which is assumed to be
 590    increased by OFFSET bytes from MEMREF.  */
 591 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
 592   adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
 593
 594 /* Likewise, but the reference is not required to be valid.  */
 595 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
 596   adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
 597
 598 extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int,
 599                              int, HOST_WIDE_INT);
 600 extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx,
 601                                         HOST_WIDE_INT, int);
 602
 603 /* Return a memory reference like MEMREF, but whose address is changed by
 604    adding OFFSET, an RTX, to it.  POW2 is the highest power of two factor
 605    known to be in OFFSET (possibly 1).  */
 606 extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT);
 607
 608 /* Definitions from emit-rtl.c */
 609 #include "emit-rtl.h"
 610
 611 /* Return a memory reference like MEMREF, but with its mode widened to
 612    MODE and adjusted by OFFSET.  */
 613 extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT);
 614
 615 /* Return a memory reference like MEMREF, but which is known to have a
 616    valid address.  */
 617 extern rtx validize_mem (rtx);
 618
 619 extern rtx use_anchored_address (rtx);
 620
 621 /* Given REF, a MEM, and T, either the type of X or the expression
 622    corresponding to REF, set the memory attributes.  OBJECTP is nonzero
 623    if we are making a new object of this type.  */
 624 extern void set_mem_attributes (rtx, tree, int);
 625
 626 /* Similar, except that BITPOS has not yet been applied to REF, so if
 627    we alter MEM_OFFSET according to T then we should subtract BITPOS
 628    expecting that it'll be added back in later.  */
 629 extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT);
 630
 631 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
 632    bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
 633    -1 if not known.  */
 634 extern int get_mem_align_offset (rtx, unsigned int);
 635
 636 /* Assemble the static constant template for function entry trampolines.  */
 637 extern rtx assemble_trampoline_template (void);
 638
 639 /* Copy given rtx to a new temp reg and return that.  */
 640 extern rtx copy_to_reg (rtx);
 641
 642 /* Like copy_to_reg but always make the reg Pmode.  */
 643 extern rtx copy_addr_to_reg (rtx);
 644
 645 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
 646 extern rtx copy_to_mode_reg (enum machine_mode, rtx);
 647
 648 /* Copy given rtx to given temp reg and return that.  */
 649 extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode);
 650
 651 /* Copy a value to a register if it isn't already a register.
 652    Args are mode (in case value is a constant) and the value.  */
 653 extern rtx force_reg (enum machine_mode, rtx);
 654
 655 /* Return given rtx, copied into a new temp reg if it was in memory.  */
 656 extern rtx force_not_mem (rtx);
 657
 658 /* Return mode and signedness to use when an argument or result in the
 659    given mode is promoted.  */
 660 extern enum machine_mode promote_function_mode (const_tree, enum machine_mode, int *,
 661                                                 const_tree, int);
 662
 663 /* Return mode and signedness to use when an object in the given mode
 664    is promoted.  */
 665 extern enum machine_mode promote_mode (const_tree, enum machine_mode, int *);
 666
 667 /* Return mode and signedness to use when object is promoted.  */
 668 enum machine_mode promote_decl_mode (const_tree, int *);
 669
 670 /* Remove some bytes from the stack.  An rtx says how many.  */
 671 extern void adjust_stack (rtx);
 672
 673 /* Add some bytes to the stack.  An rtx says how many.  */
 674 extern void anti_adjust_stack (rtx);
 675
 676 /* Add some bytes to the stack while probing it.  An rtx says how many. */
 677 extern void anti_adjust_stack_and_probe (rtx, bool);
 678
 679 /* This enum is used for the following two functions.  */
 680 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
 681
 682 /* Save the stack pointer at the specified level.  */
 683 extern void emit_stack_save (enum save_level, rtx *);
 684
 685 /* Restore the stack pointer from a save area of the specified level.  */
 686 extern void emit_stack_restore (enum save_level, rtx);
 687
 688 /* Invoke emit_stack_save for the nonlocal_goto_save_area.  */
 689 extern void update_nonlocal_goto_save_area (void);
 690
 691 /* Allocate some space on the stack dynamically and return its address.  */
 692 extern rtx allocate_dynamic_stack_space (rtx, unsigned, unsigned, bool);
 693
 694 /* Emit one stack probe at ADDRESS, an address within the stack.  */
 695 extern void emit_stack_probe (rtx);
 696
 697 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
 698    FIRST is a constant and size is a Pmode RTX.  These are offsets from
 699    the current stack pointer.  STACK_GROWS_DOWNWARD says whether to add
 700    or subtract them from the stack pointer.  */
 701 extern void probe_stack_range (HOST_WIDE_INT, rtx);
 702
 703 /* Return an rtx that refers to the value returned by a library call
 704    in its original home.  This becomes invalid if any more code is emitted.  */
 705 extern rtx hard_libcall_value (enum machine_mode, rtx);
 706
 707 extern void store_bit_field (rtx, unsigned HOST_WIDE_INT,
 708                              unsigned HOST_WIDE_INT,
 709                              unsigned HOST_WIDE_INT,
 710                              unsigned HOST_WIDE_INT,
 711                              enum machine_mode, rtx);
 712 extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT,
 713                               unsigned HOST_WIDE_INT, int, rtx,
 714                               enum machine_mode, enum machine_mode);
 715 extern rtx extract_low_bits (enum machine_mode, enum machine_mode, rtx);
 716 extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int);
 717 extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int);
 718
 719 extern rtx assemble_static_space (unsigned HOST_WIDE_INT);
 720 extern int safe_from_p (const_rtx, tree, int);
 721 extern bool split_comparison (enum rtx_code, enum machine_mode,
 722                               enum rtx_code *, enum rtx_code *);
 723
 724 /* Call this once to initialize the contents of the optabs
 725    appropriately for the current target machine.  */
 726 extern void init_optabs (void);
 727 extern void init_all_optabs (struct target_optabs *);
 728
 729 /* Call this to initialize an optab function entry.  */
 730 extern rtx init_one_libfunc (const char *);
 731 extern rtx set_user_assembler_libfunc (const char *, const char *);
 732
 733 /* Build a decl for a libfunc named NAME. */
 734 extern tree build_libfunc_function (const char *);
 735
 736 /* Get the personality libfunc for a function decl.  */
 737 rtx get_personality_function (tree);
 738
 739
 740 /* In stmt.c */
 741
 742 /* Expand a GIMPLE_SWITCH statement.  */
 743 extern void expand_case (gimple);
 744
 745 /* Like expand_case but special-case for SJLJ exception dispatching.  */
 746 extern void expand_sjlj_dispatch_table (rtx, vec<tree> );
 747
 748 #endif /* GCC_EXPR_H */