gcc/expr.h

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