gcc/expr.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 1987-2014 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     or the memory is unaligned on a STRICT_ALIGNMENT target.  */
  46 enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM,
  47                       EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE,
  48                       EXPAND_MEMORY};
  49
  50 /* Prevent the compiler from deferring stack pops.  See
  51    inhibit_defer_pop for more information.  */
  52 #define NO_DEFER_POP (inhibit_defer_pop += 1)
  53
  54 /* Allow the compiler to defer stack pops.  See inhibit_defer_pop for
  55    more information.  */
  56 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
  57 \f
  58 enum direction {none, upward, downward};
  59
  60 /* Structure to record the size of a sequence of arguments
  61    as the sum of a tree-expression and a constant.  This structure is
  62    also used to store offsets from the stack, which might be negative,
  63    so the variable part must be ssizetype, not sizetype.  */
  64
  65 struct args_size
  66 {
  67   HOST_WIDE_INT constant;
  68   tree var;
  69 };
  70
  71 /* Package up various arg related fields of struct args for
  72    locate_and_pad_parm.  */
  73 struct locate_and_pad_arg_data
  74 {
  75   /* Size of this argument on the stack, rounded up for any padding it
  76      gets.  If REG_PARM_STACK_SPACE is defined, then register parms are
  77      counted here, otherwise they aren't.  */
  78   struct args_size size;
  79   /* Offset of this argument from beginning of stack-args.  */
  80   struct args_size offset;
  81   /* Offset to the start of the stack slot.  Different from OFFSET
  82      if this arg pads downward.  */
  83   struct args_size slot_offset;
  84   /* The amount that the stack pointer needs to be adjusted to
  85      force alignment for the next argument.  */
  86   struct args_size alignment_pad;
  87   /* Which way we should pad this arg.  */
  88   enum direction where_pad;
  89   /* slot_offset is at least this aligned.  */
  90   unsigned int boundary;
  91 };
  92
  93 /* Add the value of the tree INC to the `struct args_size' TO.  */
  94
  95 #define ADD_PARM_SIZE(TO, INC)                                  \
  96 do {                                                            \
  97   tree inc = (INC);                                             \
  98   if (tree_fits_shwi_p (inc))                                   \
  99     (TO).constant += tree_to_shwi (inc);                        \
 100   else if ((TO).var == 0)                                       \
 101     (TO).var = fold_convert (ssizetype, inc);                   \
 102   else                                                          \
 103     (TO).var = size_binop (PLUS_EXPR, (TO).var,                 \
 104                            fold_convert (ssizetype, inc));      \
 105 } while (0)
 106
 107 #define SUB_PARM_SIZE(TO, DEC)                                  \
 108 do {                                                            \
 109   tree dec = (DEC);                                             \
 110   if (tree_fits_shwi_p (dec))                                   \
 111     (TO).constant -= tree_to_shwi (dec);                        \
 112   else if ((TO).var == 0)                                       \
 113     (TO).var = size_binop (MINUS_EXPR, ssize_int (0),           \
 114                            fold_convert (ssizetype, dec));      \
 115   else                                                          \
 116     (TO).var = size_binop (MINUS_EXPR, (TO).var,                \
 117                            fold_convert (ssizetype, dec));      \
 118 } while (0)
 119
 120 /* Convert the implicit sum in a `struct args_size' into a tree
 121    of type ssizetype.  */
 122 #define ARGS_SIZE_TREE(SIZE)                                    \
 123 ((SIZE).var == 0 ? ssize_int ((SIZE).constant)                  \
 124  : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \
 125                ssize_int ((SIZE).constant)))
 126
 127 /* Convert the implicit sum in a `struct args_size' into an rtx.  */
 128 #define ARGS_SIZE_RTX(SIZE)                                     \
 129 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant)                    \
 130  : expand_normal (ARGS_SIZE_TREE (SIZE)))
 131
 132 \f
 133 /* This structure is used to pass around information about exploded
 134    unary, binary and trinary expressions between expand_expr_real_1 and
 135    friends.  */
 136 typedef struct separate_ops
 137 {
 138   enum tree_code code;
 139   location_t location;
 140   tree type;
 141   tree op0, op1, op2;
 142 } *sepops;
 143 \f
 144 /* Functions from optabs.c, commonly used, and without need for the optabs
 145    tables:  */
 146
 147 /* Passed to expand_simple_binop and expand_binop to say which options
 148    to try to use if the requested operation can't be open-coded on the
 149    requisite mode.  Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
 150    a library call.  Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
 151    using a wider mode.  OPTAB_MUST_WIDEN says try widening and don't
 152    try anything else.  */
 153
 154 enum optab_methods
 155 {
 156   OPTAB_DIRECT,
 157   OPTAB_LIB,
 158   OPTAB_WIDEN,
 159   OPTAB_LIB_WIDEN,
 160   OPTAB_MUST_WIDEN
 161 };
 162
 163 /* Generate code for a simple binary or unary operation.  "Simple" in
 164    this case means "can be unambiguously described by a (mode, code)
 165    pair and mapped to a single optab."  */
 166 extern rtx expand_simple_binop (enum machine_mode, enum rtx_code, rtx,
 167                                 rtx, rtx, int, enum optab_methods);
 168 extern rtx expand_simple_unop (enum machine_mode, enum rtx_code, rtx, rtx,
 169                                int);
 170
 171 /* Report whether the machine description contains an insn which can
 172    perform the operation described by CODE and MODE.  */
 173 extern int have_insn_for (enum rtx_code, enum machine_mode);
 174
 175 /* Emit code to make a call to a constant function or a library call.  */
 176 extern void emit_libcall_block (rtx, rtx, rtx, rtx);
 177
 178 /* Create but don't emit one rtl instruction to perform certain operations.
 179    Modes must match; operands must meet the operation's predicates.
 180    Likewise for subtraction and for just copying.  */
 181 extern rtx gen_add2_insn (rtx, rtx);
 182 extern rtx gen_add3_insn (rtx, rtx, rtx);
 183 extern rtx gen_addptr3_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_addptr3_insn (rtx, rtx, rtx);
 189 extern int have_sub2_insn (rtx, rtx);
 190
 191 /* Emit a pair of rtl insns to compare two rtx's and to jump
 192    to a label if the comparison is true.  */
 193 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
 194                                      enum machine_mode, int, rtx, int prob=-1);
 195
 196 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 197 extern void emit_indirect_jump (rtx);
 198
 199 /* Generate a conditional trap instruction.  */
 200 extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
 201
 202 #include "insn-config.h"
 203
 204 #ifdef HAVE_conditional_move
 205 /* Emit a conditional move operation.  */
 206 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
 207                            rtx, rtx, enum machine_mode, int);
 208
 209 /* Return nonzero if the conditional move is supported.  */
 210 int can_conditionally_move_p (enum machine_mode mode);
 211
 212 #endif
 213 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
 214                           rtx, rtx, enum machine_mode, int);
 215
 216 rtx expand_sync_operation (rtx, rtx, enum rtx_code);
 217 rtx expand_sync_fetch_operation (rtx, rtx, enum rtx_code, bool, rtx);
 218 rtx expand_sync_lock_test_and_set (rtx, rtx, rtx);
 219
 220 rtx expand_atomic_exchange (rtx, rtx, rtx, enum memmodel);
 221 rtx expand_atomic_load (rtx, rtx, enum memmodel);
 222 rtx expand_atomic_store (rtx, rtx, enum memmodel, bool);
 223 rtx expand_atomic_fetch_op (rtx, rtx, rtx, enum rtx_code, enum memmodel,
 224                               bool);
 225 rtx expand_atomic_test_and_set (rtx, rtx, enum memmodel);
 226 rtx expand_atomic_clear (rtx, enum memmodel);
 227 void expand_atomic_thread_fence (enum memmodel);
 228 void expand_atomic_signal_fence (enum memmodel);
 229
 230 \f
 231 /* Functions from expmed.c:  */
 232
 233 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 234    May emit insns.  */
 235 extern rtx negate_rtx (enum machine_mode, rtx);
 236
 237 /* Expand a logical AND operation.  */
 238 extern rtx expand_and (enum machine_mode, rtx, rtx, rtx);
 239
 240 /* Emit a store-flag operation.  */
 241 extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
 242                             int, int);
 243
 244 /* Like emit_store_flag, but always succeeds.  */
 245 extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx,
 246                                   enum machine_mode, int, int);
 247
 248 /* Choose a minimal N + 1 bit approximation to 1/D that can be used to
 249    replace division by D, and put the least significant N bits of the result
 250    in *MULTIPLIER_PTR and return the most significant bit.  */
 251 extern unsigned HOST_WIDE_INT choose_multiplier (unsigned HOST_WIDE_INT, int,
 252                                                  int, unsigned HOST_WIDE_INT *,
 253                                                  int *, int *);
 254 \f
 255 /* Functions from builtins.c:  */
 256 extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int);
 257 extern tree std_build_builtin_va_list (void);
 258 extern tree std_fn_abi_va_list (tree);
 259 extern tree std_canonical_va_list_type (tree);
 260
 261 extern void std_expand_builtin_va_start (tree, rtx);
 262 extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int);
 263 extern void expand_builtin_setjmp_setup (rtx, rtx);
 264 extern void expand_builtin_setjmp_receiver (rtx);
 265 extern rtx expand_builtin_saveregs (void);
 266 extern void expand_builtin_trap (void);
 267 extern rtx builtin_strncpy_read_str (void *, HOST_WIDE_INT, enum machine_mode);
 268 \f
 269 /* Functions from expr.c:  */
 270
 271 /* This is run during target initialization to set up which modes can be
 272    used directly in memory and to initialize the block move optab.  */
 273 extern void init_expr_target (void);
 274
 275 /* This is run at the start of compiling a function.  */
 276 extern void init_expr (void);
 277
 278 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 279    Both modes must be floating or both fixed.  */
 280 extern void convert_move (rtx, rtx, int);
 281
 282 /* Convert an rtx to specified machine mode and return the result.  */
 283 extern rtx convert_to_mode (enum machine_mode, rtx, int);
 284
 285 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 286 extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int);
 287
 288 /* Emit code to move a block Y to a block X.  */
 289
 290 enum block_op_methods
 291 {
 292   BLOCK_OP_NORMAL,
 293   BLOCK_OP_NO_LIBCALL,
 294   BLOCK_OP_CALL_PARM,
 295   /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized.  */
 296   BLOCK_OP_TAILCALL
 297 };
 298
 299 extern GTY(()) tree block_clear_fn;
 300 extern void init_block_move_fn (const char *);
 301 extern void init_block_clear_fn (const char *);
 302
 303 extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
 304 extern rtx emit_block_move_via_libcall (rtx, rtx, rtx, bool);
 305 extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods,
 306                                   unsigned int, HOST_WIDE_INT,
 307                                   unsigned HOST_WIDE_INT,
 308                                   unsigned HOST_WIDE_INT,
 309                                   unsigned HOST_WIDE_INT);
 310 extern bool emit_storent_insn (rtx to, rtx from);
 311
 312 /* Copy all or part of a value X into registers starting at REGNO.
 313    The number of registers to be filled is NREGS.  */
 314 extern void move_block_to_reg (int, rtx, int, enum machine_mode);
 315
 316 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 317    The number of registers to be filled is NREGS.  */
 318 extern void move_block_from_reg (int, rtx, int);
 319
 320 /* Generate a non-consecutive group of registers represented by a PARALLEL.  */
 321 extern rtx gen_group_rtx (rtx);
 322
 323 /* Load a BLKmode value into non-consecutive registers represented by a
 324    PARALLEL.  */
 325 extern void emit_group_load (rtx, rtx, tree, int);
 326
 327 /* Similarly, but load into new temporaries.  */
 328 extern rtx emit_group_load_into_temps (rtx, rtx, tree, int);
 329
 330 /* Move a non-consecutive group of registers represented by a PARALLEL into
 331    a non-consecutive group of registers represented by a PARALLEL.  */
 332 extern void emit_group_move (rtx, rtx);
 333
 334 /* Move a group of registers represented by a PARALLEL into pseudos.  */
 335 extern rtx emit_group_move_into_temps (rtx);
 336
 337 /* Store a BLKmode value from non-consecutive registers represented by a
 338    PARALLEL.  */
 339 extern void emit_group_store (rtx, rtx, tree, int);
 340
 341 extern rtx maybe_emit_group_store (rtx, tree);
 342
 343 /* Copy BLKmode object from a set of registers.  */
 344 extern void copy_blkmode_from_reg (rtx, rtx, tree);
 345
 346 /* Mark REG as holding a parameter for the next CALL_INSN.
 347    Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode.  */
 348 extern void use_reg_mode (rtx *, rtx, enum machine_mode);
 349
 350 extern rtx copy_blkmode_to_reg (enum machine_mode, tree);
 351
 352 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 353 static inline void
 354 use_reg (rtx *fusage, rtx reg)
 355 {
 356   use_reg_mode (fusage, reg, VOIDmode);
 357 }
 358
 359 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 360    for the next CALL_INSN.  */
 361 extern void use_regs (rtx *, int, int);
 362
 363 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
 364 extern void use_group_regs (rtx *, rtx);
 365
 366 /* Write zeros through the storage of OBJECT.
 367    If OBJECT has BLKmode, SIZE is its length in bytes.  */
 368 extern rtx clear_storage (rtx, rtx, enum block_op_methods);
 369 extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods,
 370                                 unsigned int, HOST_WIDE_INT,
 371                                 unsigned HOST_WIDE_INT,
 372                                 unsigned HOST_WIDE_INT,
 373                                 unsigned HOST_WIDE_INT);
 374 /* The same, but always output an library call.  */
 375 rtx set_storage_via_libcall (rtx, rtx, rtx, bool);
 376
 377 /* Expand a setmem pattern; return true if successful.  */
 378 extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int,
 379                                     unsigned int, HOST_WIDE_INT,
 380                                     unsigned HOST_WIDE_INT,
 381                                     unsigned HOST_WIDE_INT,
 382                                     unsigned HOST_WIDE_INT);
 383
 384 extern unsigned HOST_WIDE_INT move_by_pieces_ninsns (unsigned HOST_WIDE_INT,
 385                                                      unsigned int,
 386                                                      unsigned int);
 387
 388 /* Return nonzero if it is desirable to store LEN bytes generated by
 389    CONSTFUN with several move instructions by store_by_pieces
 390    function.  CONSTFUNDATA is a pointer which will be passed as argument
 391    in every CONSTFUN call.
 392    ALIGN is maximum alignment we can assume.
 393    MEMSETP is true if this is a real memset/bzero, not a copy
 394    of a const string.  */
 395 extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
 396                                 rtx (*) (void *, HOST_WIDE_INT,
 397                                          enum machine_mode),
 398                                 void *, unsigned int, bool);
 399
 400 /* Generate several move instructions to store LEN bytes generated by
 401    CONSTFUN to block TO.  (A MEM rtx with BLKmode).  CONSTFUNDATA is a
 402    pointer which will be passed as argument in every CONSTFUN call.
 403    ALIGN is maximum alignment we can assume.
 404    MEMSETP is true if this is a real memset/bzero, not a copy.
 405    Returns TO + LEN.  */
 406 extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT,
 407                             rtx (*) (void *, HOST_WIDE_INT, enum machine_mode),
 408                             void *, unsigned int, bool, int);
 409
 410 /* Emit insns to set X from Y.  */
 411 extern rtx emit_move_insn (rtx, rtx);
 412
 413 /* Emit insns to set X from Y, with no frills.  */
 414 extern rtx emit_move_insn_1 (rtx, rtx);
 415
 416 extern rtx emit_move_complex_push (enum machine_mode, rtx, rtx);
 417 extern rtx emit_move_complex_parts (rtx, rtx);
 418 extern rtx emit_move_resolve_push (enum machine_mode, rtx);
 419
 420 /* Push a block of length SIZE (perhaps variable)
 421    and return an rtx to address the beginning of the block.  */
 422 extern rtx push_block (rtx, int, int);
 423
 424 /* Generate code to push something onto the stack, given its mode and type.  */
 425 extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int,
 426                             int, rtx, int, rtx, rtx, int, rtx);
 427
 428 /* Expand an assignment that stores the value of FROM into TO.  */
 429 extern void expand_assignment (tree, tree, bool);
 430
 431 /* Generate code for computing expression EXP,
 432    and storing the value into TARGET.
 433    If SUGGEST_REG is nonzero, copy the value through a register
 434    and return that register, if that is possible.  */
 435 extern rtx store_expr (tree, rtx, int, bool);
 436
 437 /* Given an rtx that may include add and multiply operations,
 438    generate them as insns and return a pseudo-reg containing the value.
 439    Useful after calling expand_expr with 1 as sum_ok.  */
 440 extern rtx force_operand (rtx, rtx);
 441
 442 /* Work horses for expand_expr.  */
 443 extern rtx expand_expr_real (tree, rtx, enum machine_mode,
 444                              enum expand_modifier, rtx *, bool);
 445 extern rtx expand_expr_real_1 (tree, rtx, enum machine_mode,
 446                                enum expand_modifier, rtx *, bool);
 447 extern rtx expand_expr_real_2 (sepops, rtx, enum machine_mode,
 448                                enum expand_modifier);
 449
 450 /* Generate code for computing expression EXP.
 451    An rtx for the computed value is returned.  The value is never null.
 452    In the case of a void EXP, const0_rtx is returned.  */
 453 static inline rtx
 454 expand_expr (tree exp, rtx target, enum machine_mode mode,
 455              enum expand_modifier modifier)
 456 {
 457   return expand_expr_real (exp, target, mode, modifier, NULL, false);
 458 }
 459
 460 static inline rtx
 461 expand_normal (tree exp)
 462 {
 463   return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL, false);
 464 }
 465
 466 /* At the start of a function, record that we have no previously-pushed
 467    arguments waiting to be popped.  */
 468 extern void init_pending_stack_adjust (void);
 469
 470 /* Discard any pending stack adjustment.  */
 471 extern void discard_pending_stack_adjust (void);
 472
 473 /* When exiting from function, if safe, clear out any pending stack adjust
 474    so the adjustment won't get done.  */
 475 extern void clear_pending_stack_adjust (void);
 476
 477 /* Pop any previously-pushed arguments that have not been popped yet.  */
 478 extern void do_pending_stack_adjust (void);
 479
 480 /* Struct for saving/restoring of pending_stack_adjust/stack_pointer_delta
 481    values.  */
 482
 483 struct saved_pending_stack_adjust
 484 {
 485   /* Saved value of pending_stack_adjust.  */
 486   int x_pending_stack_adjust;
 487
 488   /* Saved value of stack_pointer_delta.  */
 489   int x_stack_pointer_delta;
 490 };
 491
 492 /* Remember pending_stack_adjust/stack_pointer_delta.
 493    To be used around code that may call do_pending_stack_adjust (),
 494    but the generated code could be discarded e.g. using delete_insns_since.  */
 495
 496 extern void save_pending_stack_adjust (saved_pending_stack_adjust *);
 497
 498 /* Restore the saved pending_stack_adjust/stack_pointer_delta.  */
 499
 500 extern void restore_pending_stack_adjust (saved_pending_stack_adjust *);
 501
 502 /* Return the tree node and offset if a given argument corresponds to
 503    a string constant.  */
 504 extern tree string_constant (tree, tree *);
 505
 506 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
 507 extern void jumpifnot (tree, rtx, int);
 508 extern void jumpifnot_1 (enum tree_code, tree, tree, rtx, int);
 509
 510 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
 511 extern void jumpif (tree, rtx, int);
 512 extern void jumpif_1 (enum tree_code, tree, tree, rtx, int);
 513
 514 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
 515    the result is zero, or IF_TRUE_LABEL if the result is one.  */
 516 extern void do_jump (tree, rtx, rtx, int);
 517 extern void do_jump_1 (enum tree_code, tree, tree, rtx, rtx, int);
 518
 519 extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int,
 520                                      enum machine_mode, rtx, rtx, rtx, int);
 521
 522 /* Two different ways of generating switch statements.  */
 523 extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx, int);
 524 extern int try_tablejump (tree, tree, tree, tree, rtx, rtx, int);
 525
 526 /* Functions from alias.c */
 527 #include "alias.h"
 528
 529 \f
 530 /* rtl.h and tree.h were included.  */
 531 /* Return an rtx for the size in bytes of the value of an expr.  */
 532 extern rtx expr_size (tree);
 533
 534 /* Return a wide integer for the size in bytes of the value of EXP, or -1
 535    if the size can vary or is larger than an integer.  */
 536 extern HOST_WIDE_INT int_expr_size (tree);
 537
 538 /* Return an rtx that refers to the value returned by a function
 539    in its original home.  This becomes invalid if any more code is emitted.  */
 540 extern rtx hard_function_value (const_tree, const_tree, const_tree, int);
 541
 542 extern rtx prepare_call_address (tree, rtx, rtx, rtx *, int, int);
 543
 544 extern bool shift_return_value (enum machine_mode, bool, rtx);
 545
 546 extern rtx expand_call (tree, rtx, int);
 547
 548 extern void fixup_tail_calls (void);
 549
 550 #ifdef TREE_CODE
 551 extern rtx expand_variable_shift (enum tree_code, enum machine_mode,
 552                                   rtx, tree, rtx, int);
 553 extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, int, rtx,
 554                              int);
 555 extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx,
 556                           rtx, int);
 557 #endif
 558
 559 extern void locate_and_pad_parm (enum machine_mode, tree, int, int, int,
 560                                  tree, struct args_size *,
 561                                  struct locate_and_pad_arg_data *);
 562
 563 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
 564 extern rtx label_rtx (tree);
 565
 566 /* As label_rtx, but additionally the label is placed on the forced label
 567    list of its containing function (i.e. it is treated as reachable even
 568    if how is not obvious).  */
 569 extern rtx force_label_rtx (tree);
 570
 571 /* Return an rtx like arg but sans any constant terms.
 572    Returns the original rtx if it has no constant terms.
 573    The constant terms are added and stored via a second arg.  */
 574 extern rtx eliminate_constant_term (rtx, rtx *);
 575
 576 /* Convert arg to a valid memory address for specified machine mode that points
 577    to a specific named address space, by emitting insns to perform arithmetic
 578    if necessary.  */
 579 extern rtx memory_address_addr_space (enum machine_mode, rtx, addr_space_t);
 580
 581 /* Like memory_address_addr_space, except assume the memory address points to
 582    the generic named address space.  */
 583 #define memory_address(MODE,RTX) \
 584         memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC)
 585
 586 /* Return a memory reference like MEMREF, but with its mode changed
 587    to MODE and its address changed to ADDR.
 588    (VOIDmode means don't change the mode.
 589    NULL for ADDR means don't change the address.)  */
 590 extern rtx change_address (rtx, enum machine_mode, rtx);
 591
 592 /* Return a memory reference like MEMREF, but with its mode changed
 593    to MODE and its address offset by OFFSET bytes.  */
 594 #define adjust_address(MEMREF, MODE, OFFSET) \
 595   adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 0, 0)
 596
 597 /* Likewise, but the reference is not required to be valid.  */
 598 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
 599   adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1, 0, 0)
 600
 601 /* Return a memory reference like MEMREF, but with its mode changed
 602    to MODE and its address offset by OFFSET bytes.  Assume that it's
 603    for a bitfield and conservatively drop the underlying object if we
 604    cannot be sure to stay within its bounds.  */
 605 #define adjust_bitfield_address(MEMREF, MODE, OFFSET) \
 606   adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 1, 0)
 607
 608 /* As for adjust_bitfield_address, but specify that the width of
 609    BLKmode accesses is SIZE bytes.  */
 610 #define adjust_bitfield_address_size(MEMREF, MODE, OFFSET, SIZE) \
 611   adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 1, SIZE)
 612
 613 /* Likewise, but the reference is not required to be valid.  */
 614 #define adjust_bitfield_address_nv(MEMREF, MODE, OFFSET) \
 615   adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1, 1, 0)
 616
 617 /* Return a memory reference like MEMREF, but with its mode changed
 618    to MODE and its address changed to ADDR, which is assumed to be
 619    increased by OFFSET bytes from MEMREF.  */
 620 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
 621   adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
 622
 623 /* Likewise, but the reference is not required to be valid.  */
 624 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
 625   adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
 626
 627 extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int,
 628                              int, HOST_WIDE_INT);
 629 extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx,
 630                                         HOST_WIDE_INT, int);
 631
 632 /* Return a memory reference like MEMREF, but whose address is changed by
 633    adding OFFSET, an RTX, to it.  POW2 is the highest power of two factor
 634    known to be in OFFSET (possibly 1).  */
 635 extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT);
 636
 637 /* Definitions from emit-rtl.c */
 638 #include "emit-rtl.h"
 639
 640 /* Return a memory reference like MEMREF, but with its mode widened to
 641    MODE and adjusted by OFFSET.  */
 642 extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT);
 643
 644 /* Return a memory reference like MEMREF, but which is known to have a
 645    valid address.  */
 646 extern rtx validize_mem (rtx);
 647
 648 extern rtx use_anchored_address (rtx);
 649
 650 /* Given REF, a MEM, and T, either the type of X or the expression
 651    corresponding to REF, set the memory attributes.  OBJECTP is nonzero
 652    if we are making a new object of this type.  */
 653 extern void set_mem_attributes (rtx, tree, int);
 654
 655 /* Similar, except that BITPOS has not yet been applied to REF, so if
 656    we alter MEM_OFFSET according to T then we should subtract BITPOS
 657    expecting that it'll be added back in later.  */
 658 extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT);
 659
 660 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
 661    bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
 662    -1 if not known.  */
 663 extern int get_mem_align_offset (rtx, unsigned int);
 664
 665 /* Assemble the static constant template for function entry trampolines.  */
 666 extern rtx assemble_trampoline_template (void);
 667
 668 /* Copy given rtx to a new temp reg and return that.  */
 669 extern rtx copy_to_reg (rtx);
 670
 671 /* Like copy_to_reg but always make the reg Pmode.  */
 672 extern rtx copy_addr_to_reg (rtx);
 673
 674 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
 675 extern rtx copy_to_mode_reg (enum machine_mode, rtx);
 676
 677 /* Copy given rtx to given temp reg and return that.  */
 678 extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode);
 679
 680 /* Copy a value to a register if it isn't already a register.
 681    Args are mode (in case value is a constant) and the value.  */
 682 extern rtx force_reg (enum machine_mode, rtx);
 683
 684 /* Return given rtx, copied into a new temp reg if it was in memory.  */
 685 extern rtx force_not_mem (rtx);
 686
 687 /* Return mode and signedness to use when an argument or result in the
 688    given mode is promoted.  */
 689 extern enum machine_mode promote_function_mode (const_tree, enum machine_mode, int *,
 690                                                 const_tree, int);
 691
 692 /* Return mode and signedness to use when an object in the given mode
 693    is promoted.  */
 694 extern enum machine_mode promote_mode (const_tree, enum machine_mode, int *);
 695
 696 /* Return mode and signedness to use when object is promoted.  */
 697 enum machine_mode promote_decl_mode (const_tree, int *);
 698
 699 /* Remove some bytes from the stack.  An rtx says how many.  */
 700 extern void adjust_stack (rtx);
 701
 702 /* Add some bytes to the stack.  An rtx says how many.  */
 703 extern void anti_adjust_stack (rtx);
 704
 705 /* Add some bytes to the stack while probing it.  An rtx says how many. */
 706 extern void anti_adjust_stack_and_probe (rtx, bool);
 707
 708 /* This enum is used for the following two functions.  */
 709 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
 710
 711 /* Save the stack pointer at the specified level.  */
 712 extern void emit_stack_save (enum save_level, rtx *);
 713
 714 /* Restore the stack pointer from a save area of the specified level.  */
 715 extern void emit_stack_restore (enum save_level, rtx);
 716
 717 /* Invoke emit_stack_save for the nonlocal_goto_save_area.  */
 718 extern void update_nonlocal_goto_save_area (void);
 719
 720 /* Allocate some space on the stack dynamically and return its address.  */
 721 extern rtx allocate_dynamic_stack_space (rtx, unsigned, unsigned, bool);
 722
 723 /* Emit one stack probe at ADDRESS, an address within the stack.  */
 724 extern void emit_stack_probe (rtx);
 725
 726 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
 727    FIRST is a constant and size is a Pmode RTX.  These are offsets from
 728    the current stack pointer.  STACK_GROWS_DOWNWARD says whether to add
 729    or subtract them from the stack pointer.  */
 730 extern void probe_stack_range (HOST_WIDE_INT, rtx);
 731
 732 /* Return an rtx that refers to the value returned by a library call
 733    in its original home.  This becomes invalid if any more code is emitted.  */
 734 extern rtx hard_libcall_value (enum machine_mode, rtx);
 735
 736 extern void store_bit_field (rtx, unsigned HOST_WIDE_INT,
 737                              unsigned HOST_WIDE_INT,
 738                              unsigned HOST_WIDE_INT,
 739                              unsigned HOST_WIDE_INT,
 740                              enum machine_mode, rtx);
 741 extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT,
 742                               unsigned HOST_WIDE_INT, int, rtx,
 743                               enum machine_mode, enum machine_mode);
 744 extern rtx extract_low_bits (enum machine_mode, enum machine_mode, rtx);
 745 extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int);
 746 extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int);
 747
 748 extern rtx assemble_static_space (unsigned HOST_WIDE_INT);
 749 extern int safe_from_p (const_rtx, tree, int);
 750 extern bool split_comparison (enum rtx_code, enum machine_mode,
 751                               enum rtx_code *, enum rtx_code *);
 752
 753 /* Call this once to initialize the contents of the optabs
 754    appropriately for the current target machine.  */
 755 extern void init_optabs (void);
 756 extern void init_all_optabs (struct target_optabs *);
 757
 758 /* Call this to initialize an optab function entry.  */
 759 extern rtx init_one_libfunc (const char *);
 760 extern rtx set_user_assembler_libfunc (const char *, const char *);
 761
 762 /* Build a decl for a libfunc named NAME. */
 763 extern tree build_libfunc_function (const char *);
 764
 765 /* Get the personality libfunc for a function decl.  */
 766 rtx get_personality_function (tree);
 767
 768
 769 /* In stmt.c */
 770
 771 /* Expand a GIMPLE_SWITCH statement.  */
 772 extern void expand_case (gimple);
 773
 774 /* Like expand_case but special-case for SJLJ exception dispatching.  */
 775 extern void expand_sjlj_dispatch_table (rtx, vec<tree> );
 776
 777 /* Determine whether the LEN bytes can be moved by using several move
 778    instructions.  Return nonzero if a call to move_by_pieces should
 779    succeed.  */
 780 extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
 781
 782 extern unsigned HOST_WIDE_INT highest_pow2_factor (const_tree);
 783 bool array_at_struct_end_p (tree);
 784
 785 /* Return a tree of sizetype representing the size, in bytes, of the element
 786    of EXP, an ARRAY_REF or an ARRAY_RANGE_REF.  */
 787 extern tree array_ref_element_size (tree);
 788
 789 extern bool categorize_ctor_elements (const_tree, HOST_WIDE_INT *,
 790                                       HOST_WIDE_INT *, bool *);
 791
 792 /* Return a tree representing the offset, in bytes, of the field referenced
 793    by EXP.  This does not include any offset in DECL_FIELD_BIT_OFFSET.  */
 794 extern tree component_ref_field_offset (tree);
 795
 796 #endif /* GCC_EXPR_H */