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 /* Emit code to make a call to a constant function or a library call.  */
 177 extern void emit_libcall_block (rtx, rtx, rtx, rtx);
 178
 179 /* Create but don't emit one rtl instruction to perform certain operations.
 180    Modes must match; operands must meet the operation's predicates.
 181    Likewise for subtraction and for just copying.  */
 182 extern rtx gen_add2_insn (rtx, rtx);
 183 extern rtx gen_add3_insn (rtx, rtx, rtx);
 184 extern rtx gen_sub2_insn (rtx, rtx);
 185 extern rtx gen_sub3_insn (rtx, rtx, rtx);
 186 extern rtx gen_move_insn (rtx, rtx);
 187 extern int have_add2_insn (rtx, rtx);
 188 extern int have_sub2_insn (rtx, rtx);
 189
 190 /* Emit a pair of rtl insns to compare two rtx's and to jump
 191    to a label if the comparison is true.  */
 192 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
 193                                      enum machine_mode, int, rtx);
 194
 195 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 196 extern void emit_indirect_jump (rtx);
 197
 198 /* Generate a conditional trap instruction.  */
 199 extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
 200
 201 #include "insn-config.h"
 202
 203 #ifdef HAVE_conditional_move
 204 /* Emit a conditional move operation.  */
 205 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
 206                            rtx, rtx, enum machine_mode, int);
 207
 208 /* Return nonzero if the conditional move is supported.  */
 209 int can_conditionally_move_p (enum machine_mode mode);
 210
 211 #endif
 212 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
 213                           rtx, rtx, enum machine_mode, int);
 214
 215 rtx expand_sync_operation (rtx, rtx, enum rtx_code);
 216 rtx expand_sync_fetch_operation (rtx, rtx, enum rtx_code, bool, rtx);
 217 rtx expand_sync_lock_test_and_set (rtx, rtx, rtx);
 218
 219 rtx expand_atomic_exchange (rtx, rtx, rtx, enum memmodel);
 220 rtx expand_atomic_load (rtx, rtx, enum memmodel);
 221 rtx expand_atomic_store (rtx, rtx, enum memmodel, bool);
 222 rtx expand_atomic_fetch_op (rtx, rtx, rtx, enum rtx_code, enum memmodel,
 223                               bool);
 224 rtx expand_atomic_test_and_set (rtx, rtx, enum memmodel);
 225 rtx expand_atomic_clear (rtx, enum memmodel);
 226 void expand_atomic_thread_fence (enum memmodel);
 227 void expand_atomic_signal_fence (enum memmodel);
 228
 229 \f
 230 /* Functions from expmed.c:  */
 231
 232 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 233    May emit insns.  */
 234 extern rtx negate_rtx (enum machine_mode, rtx);
 235
 236 /* Expand a logical AND operation.  */
 237 extern rtx expand_and (enum machine_mode, rtx, rtx, rtx);
 238
 239 /* Emit a store-flag operation.  */
 240 extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
 241                             int, int);
 242
 243 /* Like emit_store_flag, but always succeeds.  */
 244 extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx,
 245                                   enum machine_mode, int, int);
 246 \f
 247 /* Functions from builtins.c:  */
 248 extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int);
 249 extern tree std_build_builtin_va_list (void);
 250 extern tree std_fn_abi_va_list (tree);
 251 extern tree std_canonical_va_list_type (tree);
 252
 253 extern void std_expand_builtin_va_start (tree, rtx);
 254 extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int);
 255 extern void expand_builtin_setjmp_setup (rtx, rtx);
 256 extern void expand_builtin_setjmp_receiver (rtx);
 257 extern rtx expand_builtin_saveregs (void);
 258 extern void expand_builtin_trap (void);
 259 extern rtx builtin_strncpy_read_str (void *, HOST_WIDE_INT, enum machine_mode);
 260 \f
 261 /* Functions from expr.c:  */
 262
 263 /* This is run during target initialization to set up which modes can be
 264    used directly in memory and to initialize the block move optab.  */
 265 extern void init_expr_target (void);
 266
 267 /* This is run at the start of compiling a function.  */
 268 extern void init_expr (void);
 269
 270 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 271    Both modes must be floating or both fixed.  */
 272 extern void convert_move (rtx, rtx, int);
 273
 274 /* Convert an rtx to specified machine mode and return the result.  */
 275 extern rtx convert_to_mode (enum machine_mode, rtx, int);
 276
 277 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 278 extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int);
 279
 280 /* Emit code to move a block Y to a block X.  */
 281
 282 enum block_op_methods
 283 {
 284   BLOCK_OP_NORMAL,
 285   BLOCK_OP_NO_LIBCALL,
 286   BLOCK_OP_CALL_PARM,
 287   /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized.  */
 288   BLOCK_OP_TAILCALL
 289 };
 290
 291 extern GTY(()) tree block_clear_fn;
 292 extern void init_block_move_fn (const char *);
 293 extern void init_block_clear_fn (const char *);
 294
 295 extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
 296 extern rtx emit_block_move_via_libcall (rtx, rtx, rtx, bool);
 297 extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods,
 298                                   unsigned int, HOST_WIDE_INT);
 299 extern bool emit_storent_insn (rtx to, rtx from);
 300
 301 /* Copy all or part of a value X into registers starting at REGNO.
 302    The number of registers to be filled is NREGS.  */
 303 extern void move_block_to_reg (int, rtx, int, enum machine_mode);
 304
 305 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 306    The number of registers to be filled is NREGS.  */
 307 extern void move_block_from_reg (int, rtx, int);
 308
 309 /* Generate a non-consecutive group of registers represented by a PARALLEL.  */
 310 extern rtx gen_group_rtx (rtx);
 311
 312 /* Load a BLKmode value into non-consecutive registers represented by a
 313    PARALLEL.  */
 314 extern void emit_group_load (rtx, rtx, tree, int);
 315
 316 /* Similarly, but load into new temporaries.  */
 317 extern rtx emit_group_load_into_temps (rtx, rtx, tree, int);
 318
 319 /* Move a non-consecutive group of registers represented by a PARALLEL into
 320    a non-consecutive group of registers represented by a PARALLEL.  */
 321 extern void emit_group_move (rtx, rtx);
 322
 323 /* Move a group of registers represented by a PARALLEL into pseudos.  */
 324 extern rtx emit_group_move_into_temps (rtx);
 325
 326 /* Store a BLKmode value from non-consecutive registers represented by a
 327    PARALLEL.  */
 328 extern void emit_group_store (rtx, rtx, tree, int);
 329
 330 /* Copy BLKmode object from a set of registers.  */
 331 extern rtx copy_blkmode_from_reg (rtx, rtx, tree);
 332
 333 /* Mark REG as holding a parameter for the next CALL_INSN.
 334    Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode.  */
 335 extern void use_reg_mode (rtx *, rtx, enum machine_mode);
 336
 337 extern rtx copy_blkmode_to_reg (enum machine_mode, tree);
 338
 339 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 340 static inline void
 341 use_reg (rtx *fusage, rtx reg)
 342 {
 343   use_reg_mode (fusage, reg, VOIDmode);
 344 }
 345
 346 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 347    for the next CALL_INSN.  */
 348 extern void use_regs (rtx *, int, int);
 349
 350 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
 351 extern void use_group_regs (rtx *, rtx);
 352
 353 /* Write zeros through the storage of OBJECT.
 354    If OBJECT has BLKmode, SIZE is its length in bytes.  */
 355 extern rtx clear_storage (rtx, rtx, enum block_op_methods);
 356 extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods,
 357                                 unsigned int, HOST_WIDE_INT);
 358 /* The same, but always output an library call.  */
 359 rtx set_storage_via_libcall (rtx, rtx, rtx, bool);
 360
 361 /* Expand a setmem pattern; return true if successful.  */
 362 extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int,
 363                                     unsigned int, HOST_WIDE_INT);
 364
 365 /* Determine whether the LEN bytes can be moved by using several move
 366    instructions.  Return nonzero if a call to move_by_pieces should
 367    succeed.  */
 368 extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
 369
 370 extern unsigned HOST_WIDE_INT move_by_pieces_ninsns (unsigned HOST_WIDE_INT,
 371                                                      unsigned int,
 372                                                      unsigned int);
 373
 374 /* Return nonzero if it is desirable to store LEN bytes generated by
 375    CONSTFUN with several move instructions by store_by_pieces
 376    function.  CONSTFUNDATA is a pointer which will be passed as argument
 377    in every CONSTFUN call.
 378    ALIGN is maximum alignment we can assume.
 379    MEMSETP is true if this is a real memset/bzero, not a copy
 380    of a const string.  */
 381 extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
 382                                 rtx (*) (void *, HOST_WIDE_INT,
 383                                          enum machine_mode),
 384                                 void *, unsigned int, bool);
 385
 386 /* Generate several move instructions to store LEN bytes generated by
 387    CONSTFUN to block TO.  (A MEM rtx with BLKmode).  CONSTFUNDATA is a
 388    pointer which will be passed as argument in every CONSTFUN call.
 389    ALIGN is maximum alignment we can assume.
 390    MEMSETP is true if this is a real memset/bzero, not a copy.
 391    Returns TO + LEN.  */
 392 extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT,
 393                             rtx (*) (void *, HOST_WIDE_INT, enum machine_mode),
 394                             void *, unsigned int, bool, int);
 395
 396 /* Emit insns to set X from Y.  */
 397 extern rtx emit_move_insn (rtx, rtx);
 398
 399 /* Emit insns to set X from Y, with no frills.  */
 400 extern rtx emit_move_insn_1 (rtx, rtx);
 401
 402 extern rtx emit_move_complex_push (enum machine_mode, rtx, rtx);
 403 extern rtx emit_move_complex_parts (rtx, rtx);
 404
 405 /* Push a block of length SIZE (perhaps variable)
 406    and return an rtx to address the beginning of the block.  */
 407 extern rtx push_block (rtx, int, int);
 408
 409 /* Generate code to push something onto the stack, given its mode and type.  */
 410 extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int,
 411                             int, rtx, int, rtx, rtx, int, rtx);
 412
 413 /* Expand an assignment that stores the value of FROM into TO.  */
 414 extern void expand_assignment (tree, tree, bool);
 415
 416 /* Generate code for computing expression EXP,
 417    and storing the value into TARGET.
 418    If SUGGEST_REG is nonzero, copy the value through a register
 419    and return that register, if that is possible.  */
 420 extern rtx store_expr (tree, rtx, int, bool);
 421
 422 /* Given an rtx that may include add and multiply operations,
 423    generate them as insns and return a pseudo-reg containing the value.
 424    Useful after calling expand_expr with 1 as sum_ok.  */
 425 extern rtx force_operand (rtx, rtx);
 426
 427 /* Work horses for expand_expr.  */
 428 extern rtx expand_expr_real (tree, rtx, enum machine_mode,
 429                              enum expand_modifier, rtx *);
 430 extern rtx expand_expr_real_1 (tree, rtx, enum machine_mode,
 431                                enum expand_modifier, rtx *);
 432 extern rtx expand_expr_real_2 (sepops, rtx, enum machine_mode,
 433                                enum expand_modifier);
 434
 435 /* Generate code for computing expression EXP.
 436    An rtx for the computed value is returned.  The value is never null.
 437    In the case of a void EXP, const0_rtx is returned.  */
 438 static inline rtx
 439 expand_expr (tree exp, rtx target, enum machine_mode mode,
 440              enum expand_modifier modifier)
 441 {
 442   return expand_expr_real (exp, target, mode, modifier, NULL);
 443 }
 444
 445 static inline rtx
 446 expand_normal (tree exp)
 447 {
 448   return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL);
 449 }
 450
 451 /* At the start of a function, record that we have no previously-pushed
 452    arguments waiting to be popped.  */
 453 extern void init_pending_stack_adjust (void);
 454
 455 /* Discard any pending stack adjustment.  */
 456 extern void discard_pending_stack_adjust (void);
 457
 458 /* When exiting from function, if safe, clear out any pending stack adjust
 459    so the adjustment won't get done.  */
 460 extern void clear_pending_stack_adjust (void);
 461
 462 /* Pop any previously-pushed arguments that have not been popped yet.  */
 463 extern void do_pending_stack_adjust (void);
 464
 465 /* Return the tree node and offset if a given argument corresponds to
 466    a string constant.  */
 467 extern tree string_constant (tree, tree *);
 468
 469 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
 470 extern void jumpifnot (tree, rtx, int);
 471 extern void jumpifnot_1 (enum tree_code, tree, tree, rtx, int);
 472
 473 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
 474 extern void jumpif (tree, rtx, int);
 475 extern void jumpif_1 (enum tree_code, tree, tree, rtx, int);
 476
 477 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
 478    the result is zero, or IF_TRUE_LABEL if the result is one.  */
 479 extern void do_jump (tree, rtx, rtx, int);
 480 extern void do_jump_1 (enum tree_code, tree, tree, rtx, rtx, int);
 481
 482 extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int,
 483                                      enum machine_mode, rtx, rtx, rtx, int);
 484
 485 /* Two different ways of generating switch statements.  */
 486 extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx);
 487 extern int try_tablejump (tree, tree, tree, tree, rtx, rtx);
 488
 489 /* Functions from alias.c */
 490 #include "alias.h"
 491
 492 \f
 493 /* rtl.h and tree.h were included.  */
 494 /* Return an rtx for the size in bytes of the value of an expr.  */
 495 extern rtx expr_size (tree);
 496
 497 /* Return a wide integer for the size in bytes of the value of EXP, or -1
 498    if the size can vary or is larger than an integer.  */
 499 extern HOST_WIDE_INT int_expr_size (tree);
 500
 501 /* Return an rtx that refers to the value returned by a function
 502    in its original home.  This becomes invalid if any more code is emitted.  */
 503 extern rtx hard_function_value (const_tree, const_tree, const_tree, int);
 504
 505 extern rtx prepare_call_address (tree, rtx, rtx, rtx *, int, int);
 506
 507 extern bool shift_return_value (enum machine_mode, bool, rtx);
 508
 509 extern rtx expand_call (tree, rtx, int);
 510
 511 extern void fixup_tail_calls (void);
 512
 513 #ifdef TREE_CODE
 514 extern rtx expand_variable_shift (enum tree_code, enum machine_mode,
 515                                   rtx, tree, rtx, int);
 516 extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, int, rtx,
 517                              int);
 518 extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx,
 519                           rtx, int);
 520 #endif
 521
 522 extern void locate_and_pad_parm (enum machine_mode, tree, int, int, tree,
 523                                  struct args_size *,
 524                                  struct locate_and_pad_arg_data *);
 525
 526 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
 527 extern rtx label_rtx (tree);
 528
 529 /* As label_rtx, but additionally the label is placed on the forced label
 530    list of its containing function (i.e. it is treated as reachable even
 531    if how is not obvious).  */
 532 extern rtx force_label_rtx (tree);
 533
 534 /* Return an rtx like arg but sans any constant terms.
 535    Returns the original rtx if it has no constant terms.
 536    The constant terms are added and stored via a second arg.  */
 537 extern rtx eliminate_constant_term (rtx, rtx *);
 538
 539 /* Convert arg to a valid memory address for specified machine mode that points
 540    to a specific named address space, by emitting insns to perform arithmetic
 541    if necessary.  */
 542 extern rtx memory_address_addr_space (enum machine_mode, rtx, addr_space_t);
 543
 544 /* Like memory_address_addr_space, except assume the memory address points to
 545    the generic named address space.  */
 546 #define memory_address(MODE,RTX) \
 547         memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC)
 548
 549 /* Return a memory reference like MEMREF, but with its mode changed
 550    to MODE and its address changed to ADDR.
 551    (VOIDmode means don't change the mode.
 552    NULL for ADDR means don't change the address.)  */
 553 extern rtx change_address (rtx, enum machine_mode, rtx);
 554
 555 /* Return a memory reference like MEMREF, but with its mode changed
 556    to MODE and its address offset by OFFSET bytes.  */
 557 #define adjust_address(MEMREF, MODE, OFFSET) \
 558   adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
 559
 560 /* Likewise, but the reference is not required to be valid.  */
 561 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
 562   adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
 563
 564 /* Return a memory reference like MEMREF, but with its mode changed
 565    to MODE and its address changed to ADDR, which is assumed to be
 566    increased by OFFSET bytes from MEMREF.  */
 567 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
 568   adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
 569
 570 /* Likewise, but the reference is not required to be valid.  */
 571 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
 572   adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
 573
 574 extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int);
 575 extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx,
 576                                         HOST_WIDE_INT, int);
 577
 578 /* Return a memory reference like MEMREF, but whose address is changed by
 579    adding OFFSET, an RTX, to it.  POW2 is the highest power of two factor
 580    known to be in OFFSET (possibly 1).  */
 581 extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT);
 582
 583 /* Definitions from emit-rtl.c */
 584 #include "emit-rtl.h"
 585
 586 /* Return a memory reference like MEMREF, but with its mode widened to
 587    MODE and adjusted by OFFSET.  */
 588 extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT);
 589
 590 /* Return a memory reference like MEMREF, but which is known to have a
 591    valid address.  */
 592 extern rtx validize_mem (rtx);
 593
 594 extern rtx use_anchored_address (rtx);
 595
 596 /* Given REF, a MEM, and T, either the type of X or the expression
 597    corresponding to REF, set the memory attributes.  OBJECTP is nonzero
 598    if we are making a new object of this type.  */
 599 extern void set_mem_attributes (rtx, tree, int);
 600
 601 /* Similar, except that BITPOS has not yet been applied to REF, so if
 602    we alter MEM_OFFSET according to T then we should subtract BITPOS
 603    expecting that it'll be added back in later.  */
 604 extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT);
 605
 606 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
 607    bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
 608    -1 if not known.  */
 609 extern int get_mem_align_offset (rtx, unsigned int);
 610
 611 /* Assemble the static constant template for function entry trampolines.  */
 612 extern rtx assemble_trampoline_template (void);
 613
 614 /* Copy given rtx to a new temp reg and return that.  */
 615 extern rtx copy_to_reg (rtx);
 616
 617 /* Like copy_to_reg but always make the reg Pmode.  */
 618 extern rtx copy_addr_to_reg (rtx);
 619
 620 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
 621 extern rtx copy_to_mode_reg (enum machine_mode, rtx);
 622
 623 /* Copy given rtx to given temp reg and return that.  */
 624 extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode);
 625
 626 /* Copy a value to a register if it isn't already a register.
 627    Args are mode (in case value is a constant) and the value.  */
 628 extern rtx force_reg (enum machine_mode, rtx);
 629
 630 /* Return given rtx, copied into a new temp reg if it was in memory.  */
 631 extern rtx force_not_mem (rtx);
 632
 633 /* Return mode and signedness to use when an argument or result in the
 634    given mode is promoted.  */
 635 extern enum machine_mode promote_function_mode (const_tree, enum machine_mode, int *,
 636                                                 const_tree, int);
 637
 638 /* Return mode and signedness to use when an object in the given mode
 639    is promoted.  */
 640 extern enum machine_mode promote_mode (const_tree, enum machine_mode, int *);
 641
 642 /* Return mode and signedness to use when object is promoted.  */
 643 enum machine_mode promote_decl_mode (const_tree, int *);
 644
 645 /* Remove some bytes from the stack.  An rtx says how many.  */
 646 extern void adjust_stack (rtx);
 647
 648 /* Add some bytes to the stack.  An rtx says how many.  */
 649 extern void anti_adjust_stack (rtx);
 650
 651 /* Add some bytes to the stack while probing it.  An rtx says how many. */
 652 extern void anti_adjust_stack_and_probe (rtx, bool);
 653
 654 /* This enum is used for the following two functions.  */
 655 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
 656
 657 /* Save the stack pointer at the specified level.  */
 658 extern void emit_stack_save (enum save_level, rtx *);
 659
 660 /* Restore the stack pointer from a save area of the specified level.  */
 661 extern void emit_stack_restore (enum save_level, rtx);
 662
 663 /* Invoke emit_stack_save for the nonlocal_goto_save_area.  */
 664 extern void update_nonlocal_goto_save_area (void);
 665
 666 /* Allocate some space on the stack dynamically and return its address.  */
 667 extern rtx allocate_dynamic_stack_space (rtx, unsigned, unsigned, bool);
 668
 669 /* Emit one stack probe at ADDRESS, an address within the stack.  */
 670 extern void emit_stack_probe (rtx);
 671
 672 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
 673    FIRST is a constant and size is a Pmode RTX.  These are offsets from
 674    the current stack pointer.  STACK_GROWS_DOWNWARD says whether to add
 675    or subtract them from the stack pointer.  */
 676 extern void probe_stack_range (HOST_WIDE_INT, rtx);
 677
 678 /* Return an rtx that refers to the value returned by a library call
 679    in its original home.  This becomes invalid if any more code is emitted.  */
 680 extern rtx hard_libcall_value (enum machine_mode, rtx);
 681
 682 /* Return the mode desired by operand N of a particular bitfield
 683    insert/extract insn, or MAX_MACHINE_MODE if no such insn is
 684    available.  */
 685
 686 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
 687 extern enum machine_mode
 688 mode_for_extraction (enum extraction_pattern, int);
 689
 690 extern void store_bit_field (rtx, unsigned HOST_WIDE_INT,
 691                              unsigned HOST_WIDE_INT,
 692                              unsigned HOST_WIDE_INT,
 693                              unsigned HOST_WIDE_INT,
 694                              enum machine_mode, rtx);
 695 extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT,
 696                               unsigned HOST_WIDE_INT, int, bool, rtx,
 697                               enum machine_mode, enum machine_mode);
 698 extern rtx extract_low_bits (enum machine_mode, enum machine_mode, rtx);
 699 extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int);
 700 extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int);
 701
 702 extern rtx assemble_static_space (unsigned HOST_WIDE_INT);
 703 extern int safe_from_p (const_rtx, tree, int);
 704 extern bool split_comparison (enum rtx_code, enum machine_mode,
 705                               enum rtx_code *, enum rtx_code *);
 706
 707 /* Call this once to initialize the contents of the optabs
 708    appropriately for the current target machine.  */
 709 extern void init_optabs (void);
 710 extern void init_all_optabs (void);
 711
 712 /* Call this to initialize an optab function entry.  */
 713 extern rtx init_one_libfunc (const char *);
 714 extern rtx set_user_assembler_libfunc (const char *, const char *);
 715
 716 /* Build a decl for a libfunc named NAME. */
 717 extern tree build_libfunc_function (const char *);
 718
 719 /* Get the personality libfunc for a function decl.  */
 720 rtx get_personality_function (tree);
 721
 722 #endif /* GCC_EXPR_H */