gcc/fortran/trans.h

   1 /* Header for code translation functions
   2    Copyright (C) 2002-2020 Free Software Foundation, Inc.
   3    Contributed by Paul Brook
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GFC_TRANS_H
  22 #define GFC_TRANS_H
  23
  24 #include "predict.h"  /* For enum br_predictor and PRED_*.  */
  25
  26 /* Mangled symbols take the form __module__name or __module.submodule__name.  */
  27 #define GFC_MAX_MANGLED_SYMBOL_LEN  (GFC_MAX_SYMBOL_LEN*3+5)
  28
  29 /* Struct for holding a block of statements.  It should be treated as an
  30    opaque entity and not modified directly.  This allows us to change the
  31    underlying representation of statement lists.  */
  32 typedef struct
  33 {
  34   tree head;
  35   unsigned int has_scope:1;
  36 }
  37 stmtblock_t;
  38
  39 /* a simplified expression */
  40 typedef struct gfc_se
  41 {
  42   /* Code blocks to be executed before and after using the value.  */
  43   stmtblock_t pre;
  44   stmtblock_t post;
  45
  46   /* the result of the expression */
  47   tree expr;
  48
  49   /* The length of a character string value.  */
  50   tree string_length;
  51
  52   /* When expr is a reference to a class object, store its vptr access
  53      here.  */
  54   tree class_vptr;
  55
  56   /* If set gfc_conv_variable will return an expression for the array
  57      descriptor. When set, want_pointer should also be set.
  58      If not set scalarizing variables will be substituted.  */
  59   unsigned descriptor_only:1;
  60
  61   /* When this is set gfc_conv_expr returns the address of a variable.  Only
  62      applies to EXPR_VARIABLE nodes.
  63      Also used by gfc_conv_array_parameter. When set this indicates a pointer
  64      to the descriptor should be returned, rather than the descriptor itself.
  65    */
  66   unsigned want_pointer:1;
  67
  68   /* An array function call returning without a temporary.  Also used for array
  69      pointer assignments.  */
  70   unsigned direct_byref:1;
  71
  72   /* If direct_byref is set, do work out the descriptor as in that case but
  73      do still create a new descriptor variable instead of using an
  74      existing one.  This is useful for special pointer assignments like
  75      rank remapping where we have to process the descriptor before
  76      assigning to final one.  */
  77   unsigned byref_noassign:1;
  78
  79   /* Ignore absent optional arguments.  Used for some intrinsics.  */
  80   unsigned ignore_optional:1;
  81
  82   /* When this is set the data and offset fields of the returned descriptor
  83      are NULL.  Used by intrinsic size.  */
  84   unsigned data_not_needed:1;
  85
  86   /* If set, gfc_conv_procedure_call does not put byref calls into se->pre.  */
  87   unsigned no_function_call:1;
  88
  89   /* If set, we will force the creation of a temporary. Useful to disable
  90      non-copying procedure argument passing optimizations, when some function
  91      args alias.  */
  92   unsigned force_tmp:1;
  93
  94   /* If set, will pass subref descriptors without a temporary.  */
  95   unsigned force_no_tmp:1;
  96
  97   /* Unconditionally calculate offset for array segments and constant
  98      arrays in gfc_conv_expr_descriptor.  */
  99   unsigned use_offset:1;
 100
 101   unsigned want_coarray:1;
 102
 103   /* Scalarization parameters.  */
 104   struct gfc_se *parent;
 105   struct gfc_ss *ss;
 106   struct gfc_loopinfo *loop;
 107 }
 108 gfc_se;
 109
 110 typedef struct gfc_co_subroutines_args
 111 {
 112   tree image_index;
 113   tree stat;
 114   tree errmsg;
 115   tree errmsg_len;
 116 }
 117 gfc_co_subroutines_args;
 118
 119 /* Denotes different types of coarray.
 120    Please keep in sync with libgfortran/caf/libcaf.h.  */
 121 enum gfc_coarray_regtype
 122 {
 123   GFC_CAF_COARRAY_STATIC,
 124   GFC_CAF_COARRAY_ALLOC,
 125   GFC_CAF_LOCK_STATIC,
 126   GFC_CAF_LOCK_ALLOC,
 127   GFC_CAF_CRITICAL,
 128   GFC_CAF_EVENT_STATIC,
 129   GFC_CAF_EVENT_ALLOC,
 130   GFC_CAF_COARRAY_ALLOC_REGISTER_ONLY,
 131   GFC_CAF_COARRAY_ALLOC_ALLOCATE_ONLY
 132 };
 133
 134
 135 /* Describes the action to take on _caf_deregister.  Keep in sync with
 136    gcc/fortran/trans.h.  The negative values are not valid for the library and
 137    are used by the drivers for building the correct call.  */
 138 enum gfc_coarray_deregtype {
 139   /* This is no coarray, i.e. build a call to a free ().  */
 140   GFC_CAF_COARRAY_NOCOARRAY = -2,
 141   /* The driver is to analyze which _caf_deregister ()-call to generate.  */
 142   GFC_CAF_COARRAY_ANALYZE = -1,
 143   GFC_CAF_COARRAY_DEREGISTER = 0,
 144   GFC_CAF_COARRAY_DEALLOCATE_ONLY
 145 };
 146
 147
 148 /* Specify the type of ref handed to the caf communication functions.
 149    Please keep in sync with libgfortran/caf/libcaf.h.  */
 150 enum gfc_caf_ref_type_t {
 151   GFC_CAF_REF_COMPONENT,
 152   GFC_CAF_REF_ARRAY,
 153   GFC_CAF_REF_STATIC_ARRAY
 154 };
 155
 156
 157 /* Give the reference type of an array ref.
 158    Please keep in sync with libgfortran/caf/libcaf.h.  */
 159 enum gfc_caf_array_ref_t {
 160   GFC_CAF_ARR_REF_NONE = 0,
 161   GFC_CAF_ARR_REF_VECTOR,
 162   GFC_CAF_ARR_REF_FULL,
 163   GFC_CAF_ARR_REF_RANGE,
 164   GFC_CAF_ARR_REF_SINGLE,
 165   GFC_CAF_ARR_REF_OPEN_END,
 166   GFC_CAF_ARR_REF_OPEN_START
 167 };
 168
 169
 170 /* trans-array (structure_alloc_comps) caf_mode bits.  */
 171 enum gfc_structure_caf_mode_t {
 172   GFC_STRUCTURE_CAF_MODE_ENABLE_COARRAY = 1 << 0,
 173   GFC_STRUCTURE_CAF_MODE_IN_COARRAY = 1 << 1,
 174   GFC_STRUCTURE_CAF_MODE_DEALLOC_ONLY = 1 << 2
 175 };
 176
 177
 178 /* The array-specific scalarization information.  The array members of
 179    this struct are indexed by actual array index, and thus can be sparse.  */
 180
 181 typedef struct gfc_array_info
 182 {
 183   mpz_t *shape;
 184
 185   /* The ref that holds information on this section.  */
 186   gfc_ref *ref;
 187   /* The descriptor of this array.  */
 188   tree descriptor;
 189   /* holds the pointer to the data array.  */
 190   tree data;
 191   /* To move some of the array index calculation out of the innermost loop.  */
 192   tree offset;
 193   tree saved_offset;
 194   tree stride0;
 195   /* Holds the SS for a subscript.  Indexed by actual dimension.  */
 196   struct gfc_ss *subscript[GFC_MAX_DIMENSIONS];
 197
 198   /* stride and delta are used to access this inside a scalarization loop.
 199      start is used in the calculation of these.  Indexed by scalarizer
 200      dimension.  */
 201   tree start[GFC_MAX_DIMENSIONS];
 202   tree end[GFC_MAX_DIMENSIONS];
 203   tree stride[GFC_MAX_DIMENSIONS];
 204   tree delta[GFC_MAX_DIMENSIONS];
 205 }
 206 gfc_array_info;
 207
 208 enum gfc_ss_type
 209 {
 210   /* A scalar value.  This will be evaluated before entering the
 211      scalarization loop.  */
 212   GFC_SS_SCALAR,
 213
 214   /* Like GFC_SS_SCALAR it evaluates the expression outside the
 215      loop.  Is always evaluated as a reference to the temporary, unless
 216      temporary evaluation can result in a NULL pointer dereferencing (case of
 217      optional arguments).  Used for elemental function arguments.  */
 218   GFC_SS_REFERENCE,
 219
 220   /* An array section.  Scalarization indices will be substituted during
 221      expression translation.  */
 222   GFC_SS_SECTION,
 223
 224   /* A non-elemental function call returning an array.  The call is executed
 225      before entering the scalarization loop, storing the result in a
 226      temporary.  This temporary is then used inside the scalarization loop.
 227      Simple assignments, e.g. a(:) = fn(), are handled without a temporary
 228      as a special case.  */
 229   GFC_SS_FUNCTION,
 230
 231   /* An array constructor.  The current implementation is sub-optimal in
 232      many cases.  It allocated a temporary, assigns the values to it, then
 233      uses this temporary inside the scalarization loop.  */
 234   GFC_SS_CONSTRUCTOR,
 235
 236   /* A vector subscript.  The vector's descriptor is cached in the
 237      "descriptor" field of the associated gfc_ss_info.  */
 238   GFC_SS_VECTOR,
 239
 240   /* A temporary array allocated by the scalarizer.  Its rank can be less
 241      than that of the assignment expression.  */
 242   GFC_SS_TEMP,
 243
 244   /* An intrinsic function call.  Many intrinsic functions which map directly
 245      to library calls are created as GFC_SS_FUNCTION nodes.  */
 246   GFC_SS_INTRINSIC,
 247
 248   /* A component of a derived type.  */
 249   GFC_SS_COMPONENT
 250 };
 251
 252
 253 typedef struct gfc_ss_info
 254 {
 255   int refcount;
 256   gfc_ss_type type;
 257   gfc_expr *expr;
 258   tree string_length;
 259
 260   union
 261   {
 262     /* If type is GFC_SS_SCALAR or GFC_SS_REFERENCE.  */
 263     struct
 264     {
 265       /* If the scalar is passed as actual argument to an (elemental) procedure,
 266          this is the symbol of the corresponding dummy argument.  */
 267       gfc_symbol *dummy_arg;
 268       tree value;
 269       /* Tells that the scalar is a reference to a variable that might
 270          be present on the lhs, so that we should evaluate the value
 271          itself before the loop, not just the reference.  */
 272       unsigned needs_temporary:1;
 273     }
 274     scalar;
 275
 276     /* GFC_SS_TEMP.  */
 277     struct
 278     {
 279       tree type;
 280     }
 281     temp;
 282
 283     /* All other types.  */
 284     gfc_array_info array;
 285   }
 286   data;
 287
 288   /* This is used by assignments requiring temporaries.  The bits specify which
 289      loops the terms appear in.  This will be 1 for the RHS expressions,
 290      2 for the LHS expressions, and 3(=1|2) for the temporary.  */
 291   unsigned useflags:2;
 292
 293   /* Suppresses precalculation of scalars in WHERE assignments.  */
 294   unsigned where:1;
 295
 296   /* This set for an elemental function that contains expressions for
 297      external arrays, thereby triggering creation of a temporary.  */
 298   unsigned array_outer_dependency:1;
 299
 300   /* Tells whether the SS is for an actual argument which can be a NULL
 301      reference.  In other words, the associated dummy argument is OPTIONAL.
 302      Used to handle elemental procedures.  */
 303   bool can_be_null_ref;
 304 }
 305 gfc_ss_info;
 306
 307 #define gfc_get_ss_info() XCNEW (gfc_ss_info)
 308
 309
 310 /* Scalarization State chain.  Created by walking an expression tree before
 311    creating the scalarization loops.  Then passed as part of a gfc_se structure
 312    to translate the expression inside the loop.  Note that these chains are
 313    terminated by gfc_ss_terminator, not NULL.  A NULL pointer in a gfc_se
 314    indicates to gfc_conv_* that this is a scalar expression.
 315    SS structures can only belong to a single loopinfo.  They must be added
 316    otherwise they will not get freed.  */
 317
 318 typedef struct gfc_ss
 319 {
 320   gfc_ss_info *info;
 321
 322   int dimen;
 323   /* Translation from loop dimensions to actual array dimensions.
 324      actual_dim = dim[loop_dim]  */
 325   int dim[GFC_MAX_DIMENSIONS];
 326
 327   /* All the SS in a loop and linked through loop_chain.  The SS for an
 328      expression are linked by the next pointer.  */
 329   struct gfc_ss *loop_chain;
 330   struct gfc_ss *next;
 331
 332   /* Non-null if the ss is part of a nested loop.  */
 333   struct gfc_ss *parent;
 334
 335   /* If the evaluation of an expression requires a nested loop (for example
 336      if the sum intrinsic is evaluated inline), this points to the nested
 337      loop's gfc_ss.  */
 338   struct gfc_ss *nested_ss;
 339
 340   /* The loop this gfc_ss is in.  */
 341   struct gfc_loopinfo *loop;
 342
 343   unsigned is_alloc_lhs:1;
 344   unsigned no_bounds_check:1;
 345 }
 346 gfc_ss;
 347 #define gfc_get_ss() XCNEW (gfc_ss)
 348
 349 /* The contents of this aren't actually used.  A NULL SS chain indicates a
 350    scalar expression, so this pointer is used to terminate SS chains.  */
 351 extern gfc_ss * const gfc_ss_terminator;
 352
 353 /* Holds information about an expression while it is being scalarized.  */
 354 typedef struct gfc_loopinfo
 355 {
 356   stmtblock_t pre;
 357   stmtblock_t post;
 358
 359   int dimen;
 360
 361   /* All the SS involved with this loop.  */
 362   gfc_ss *ss;
 363   /* The SS describing the temporary used in an assignment.  */
 364   gfc_ss *temp_ss;
 365
 366   /* Non-null if this loop is nested in another one.  */
 367   struct gfc_loopinfo *parent;
 368
 369   /* Chain of nested loops.  */
 370   struct gfc_loopinfo *nested, *next;
 371
 372   /* The scalarization loop index variables.  */
 373   tree loopvar[GFC_MAX_DIMENSIONS];
 374
 375   /* The bounds of the scalarization loops.  */
 376   tree from[GFC_MAX_DIMENSIONS];
 377   tree to[GFC_MAX_DIMENSIONS];
 378   gfc_ss *specloop[GFC_MAX_DIMENSIONS];
 379
 380   /* The code member contains the code for the body of the next outer loop.  */
 381   stmtblock_t code[GFC_MAX_DIMENSIONS];
 382
 383   /* Order in which the dimensions should be looped, innermost first.  */
 384   int order[GFC_MAX_DIMENSIONS];
 385
 386   /* Enum to control loop reversal.  */
 387   gfc_reverse reverse[GFC_MAX_DIMENSIONS];
 388
 389   /* The number of dimensions for which a temporary is used.  */
 390   int temp_dim;
 391
 392   /* If set we don't need the loop variables.  */
 393   unsigned array_parameter:1;
 394 }
 395 gfc_loopinfo;
 396
 397 #define gfc_get_loopinfo() XCNEW (gfc_loopinfo)
 398
 399 /* Information about a symbol that has been shadowed by a temporary.  */
 400 typedef struct
 401 {
 402   symbol_attribute attr;
 403   tree decl;
 404 }
 405 gfc_saved_var;
 406
 407
 408 /* Store information about a block of code together with special
 409    initialization and clean-up code.  This can be used to incrementally add
 410    init and cleanup, and in the end put everything together to a
 411    try-finally expression.  */
 412 typedef struct
 413 {
 414   tree init;
 415   tree cleanup;
 416   tree code;
 417 }
 418 gfc_wrapped_block;
 419
 420 /* Class API functions.  */
 421 tree gfc_class_set_static_fields (tree, tree, tree);
 422 tree gfc_class_data_get (tree);
 423 tree gfc_class_vptr_get (tree);
 424 tree gfc_class_len_get (tree);
 425 tree gfc_class_len_or_zero_get (tree);
 426 gfc_expr * gfc_find_and_cut_at_last_class_ref (gfc_expr *, bool is_mold = false);
 427 /* Get an accessor to the class' vtab's * field, when a class handle is
 428    available.  */
 429 tree gfc_class_vtab_hash_get (tree);
 430 tree gfc_class_vtab_size_get (tree);
 431 tree gfc_class_vtab_extends_get (tree);
 432 tree gfc_class_vtab_def_init_get (tree);
 433 tree gfc_class_vtab_copy_get (tree);
 434 tree gfc_class_vtab_final_get (tree);
 435 /* Get an accessor to the vtab's * field, when a vptr handle is present.  */
 436 tree gfc_vtpr_hash_get (tree);
 437 tree gfc_vptr_size_get (tree);
 438 tree gfc_vptr_extends_get (tree);
 439 tree gfc_vptr_def_init_get (tree);
 440 tree gfc_vptr_copy_get (tree);
 441 tree gfc_vptr_final_get (tree);
 442 tree gfc_vptr_deallocate_get (tree);
 443 void gfc_reset_vptr (stmtblock_t *, gfc_expr *);
 444 void gfc_reset_len (stmtblock_t *, gfc_expr *);
 445 tree gfc_get_class_from_expr (tree);
 446 tree gfc_get_vptr_from_expr (tree);
 447 tree gfc_get_class_array_ref (tree, tree, tree, bool);
 448 tree gfc_copy_class_to_class (tree, tree, tree, bool);
 449 bool gfc_add_finalizer_call (stmtblock_t *, gfc_expr *);
 450 bool gfc_add_comp_finalizer_call (stmtblock_t *, tree, gfc_component *, bool);
 451
 452 void gfc_conv_derived_to_class (gfc_se *, gfc_expr *, gfc_typespec, tree, bool,
 453                                 bool);
 454 void gfc_conv_class_to_class (gfc_se *, gfc_expr *, gfc_typespec, bool, bool,
 455                               bool, bool);
 456
 457 /* Initialize an init/cleanup block.  */
 458 void gfc_start_wrapped_block (gfc_wrapped_block* block, tree code);
 459 /* Add a pair of init/cleanup code to the block.  Each one might be a
 460    NULL_TREE if not required.  */
 461 void gfc_add_init_cleanup (gfc_wrapped_block* block, tree init, tree cleanup);
 462 /* Finalize the block, that is, create a single expression encapsulating the
 463    original code together with init and clean-up code.  */
 464 tree gfc_finish_wrapped_block (gfc_wrapped_block* block);
 465
 466
 467 /* Advance the SS chain to the next term.  */
 468 void gfc_advance_se_ss_chain (gfc_se *);
 469
 470 /* Call this to initialize a gfc_se structure before use
 471    first parameter is structure to initialize, second is
 472    parent to get scalarization data from, or NULL.  */
 473 void gfc_init_se (gfc_se *, gfc_se *);
 474
 475 /* Create an artificial variable decl and add it to the current scope.  */
 476 tree gfc_create_var (tree, const char *);
 477 /* Like above but doesn't add it to the current scope.  */
 478 tree gfc_create_var_np (tree, const char *);
 479
 480 /* Store the result of an expression in a temp variable so it can be used
 481    repeatedly even if the original changes */
 482 void gfc_make_safe_expr (gfc_se * se);
 483
 484 /* Makes sure se is suitable for passing as a function string parameter.  */
 485 void gfc_conv_string_parameter (gfc_se * se);
 486
 487 /* Compare two strings.  */
 488 tree gfc_build_compare_string (tree, tree, tree, tree, int, enum tree_code);
 489
 490 /* When using the gfc_conv_* make sure you understand what they do, i.e.
 491    when a POST chain may be created, and what the returned expression may be
 492    used for.  Note that character strings have special handling.  This
 493    should not be a problem as most statements/operations only deal with
 494    numeric/logical types.  See the implementations in trans-expr.c
 495    for details of the individual functions.  */
 496
 497 void gfc_conv_expr (gfc_se * se, gfc_expr * expr);
 498 void gfc_conv_expr_val (gfc_se * se, gfc_expr * expr);
 499 void gfc_conv_expr_lhs (gfc_se * se, gfc_expr * expr);
 500 void gfc_conv_expr_reference (gfc_se * se, gfc_expr * expr,
 501                               bool add_clobber = false);
 502 void gfc_conv_expr_type (gfc_se * se, gfc_expr *, tree);
 503
 504
 505 /* trans-expr.c */
 506 tree gfc_conv_scalar_to_descriptor (gfc_se *, tree, symbol_attribute);
 507 tree gfc_get_ultimate_alloc_ptr_comps_caf_token (gfc_se *, gfc_expr *);
 508 void gfc_conv_scalar_char_value (gfc_symbol *sym, gfc_se *se, gfc_expr **expr);
 509 tree gfc_string_to_single_character (tree len, tree str, int kind);
 510 tree gfc_get_tree_for_caf_expr (gfc_expr *);
 511 void gfc_get_caf_token_offset (gfc_se*, tree *, tree *, tree, tree, gfc_expr *);
 512 tree gfc_caf_get_image_index (stmtblock_t *, gfc_expr *, tree);
 513
 514 /* Find the decl containing the auxiliary variables for assigned variables.  */
 515 void gfc_conv_label_variable (gfc_se * se, gfc_expr * expr);
 516 /* If the value is not constant, Create a temporary and copy the value.  */
 517 tree gfc_evaluate_now_loc (location_t, tree, stmtblock_t *);
 518 tree gfc_evaluate_now (tree, stmtblock_t *);
 519 tree gfc_evaluate_now_function_scope (tree, stmtblock_t *);
 520
 521 /* Find the appropriate variant of a math intrinsic.  */
 522 tree gfc_builtin_decl_for_float_kind (enum built_in_function, int);
 523
 524 tree size_of_string_in_bytes (int, tree);
 525
 526 /* Intrinsic procedure handling.  */
 527 tree gfc_conv_intrinsic_subroutine (gfc_code *);
 528 void gfc_conv_intrinsic_function (gfc_se *, gfc_expr *);
 529 bool gfc_conv_ieee_arithmetic_function (gfc_se *, gfc_expr *);
 530 tree gfc_save_fp_state (stmtblock_t *);
 531 void gfc_restore_fp_state (stmtblock_t *, tree);
 532
 533 bool gfc_expr_is_variable (gfc_expr *);
 534
 535 /* Does an intrinsic map directly to an external library call
 536    This is true for array-returning intrinsics, unless
 537    gfc_inline_intrinsic_function_p returns true.  */
 538 int gfc_is_intrinsic_libcall (gfc_expr *);
 539
 540 /* Used to call ordinary functions/subroutines
 541    and procedure pointer components.  */
 542 int gfc_conv_procedure_call (gfc_se *, gfc_symbol *, gfc_actual_arglist *,
 543                              gfc_expr *, vec<tree, va_gc> *);
 544
 545 void gfc_conv_subref_array_arg (gfc_se *, gfc_expr *, int, sym_intent, bool,
 546                                 const gfc_symbol *fsym = NULL,
 547                                 const char *proc_name = NULL,
 548                                 gfc_symbol *sym = NULL,
 549                                 bool check_contiguous = false);
 550
 551 void gfc_conv_is_contiguous_expr (gfc_se *, gfc_expr *);
 552
 553 /* Generate code for a scalar assignment.  */
 554 tree gfc_trans_scalar_assign (gfc_se *, gfc_se *, gfc_typespec, bool, bool,
 555                               bool c = false);
 556
 557 /* Translate COMMON blocks.  */
 558 void gfc_trans_common (gfc_namespace *);
 559
 560 /* Translate a derived type constructor.  */
 561 void gfc_conv_structure (gfc_se *, gfc_expr *, int);
 562
 563 /* Return an expression which determines if a dummy parameter is present.  */
 564 tree gfc_conv_expr_present (gfc_symbol *, bool use_saved_decl = false);
 565 /* Convert a missing, dummy argument into a null or zero.  */
 566 void gfc_conv_missing_dummy (gfc_se *, gfc_expr *, gfc_typespec, int);
 567
 568 /* Lowering of component references.  */
 569 void gfc_conv_component_ref (gfc_se * se, gfc_ref * ref);
 570 void conv_parent_component_references (gfc_se * se, gfc_ref * ref);
 571
 572 /* Automatically dereference var.  */
 573 tree gfc_maybe_dereference_var (gfc_symbol *, tree, bool desc_only = false,
 574                                 bool is_classarray = false);
 575
 576 /* Generate code to allocate a string temporary.  */
 577 tree gfc_conv_string_tmp (gfc_se *, tree, tree);
 578 /* Get the string length variable belonging to an expression.  */
 579 tree gfc_get_expr_charlen (gfc_expr *);
 580 /* Initialize a string length variable.  */
 581 void gfc_conv_string_length (gfc_charlen *, gfc_expr *, stmtblock_t *);
 582 /* Ensure type sizes can be gimplified.  */
 583 void gfc_trans_vla_type_sizes (gfc_symbol *, stmtblock_t *);
 584
 585 /* Add an expression to the end of a block.  */
 586 void gfc_add_expr_to_block (stmtblock_t *, tree);
 587 /* Add an expression to the beginning of a block.  */
 588 void gfc_prepend_expr_to_block (stmtblock_t *, tree);
 589 /* Add a block to the end of a block.  */
 590 void gfc_add_block_to_block (stmtblock_t *, stmtblock_t *);
 591 /* Add a MODIFY_EXPR to a block.  */
 592 void gfc_add_modify_loc (location_t, stmtblock_t *, tree, tree);
 593 void gfc_add_modify (stmtblock_t *, tree, tree);
 594
 595 /* Initialize a statement block.  */
 596 void gfc_init_block (stmtblock_t *);
 597 /* Start a new statement block.  Like gfc_init_block but also starts a new
 598    variable scope.  */
 599 void gfc_start_block (stmtblock_t *);
 600 /* Finish a statement block.  Also closes the scope if the block was created
 601    with gfc_start_block.  */
 602 tree gfc_finish_block (stmtblock_t *);
 603 /* Merge the scope of a block with its parent.  */
 604 void gfc_merge_block_scope (stmtblock_t * block);
 605
 606 /* Return the backend label decl.  */
 607 tree gfc_get_label_decl (gfc_st_label *);
 608
 609 /* Return the decl for an external function.  */
 610 tree gfc_get_extern_function_decl (gfc_symbol *,
 611                                    gfc_actual_arglist *args = NULL);
 612
 613 /* Return the decl for a function.  */
 614 tree gfc_get_function_decl (gfc_symbol *);
 615
 616 /* Build an ADDR_EXPR.  */
 617 tree gfc_build_addr_expr (tree, tree);
 618
 619 /* Build an ARRAY_REF.  */
 620 tree gfc_build_array_ref (tree, tree, tree, tree vptr = NULL_TREE);
 621
 622 /* Creates a label.  Decl is artificial if label_id == NULL_TREE.  */
 623 tree gfc_build_label_decl (tree);
 624
 625 /* Return the decl used to hold the function return value.
 626    Do not use if the function has an explicit result variable.  */
 627 tree gfc_get_fake_result_decl (gfc_symbol *, int);
 628
 629 /* Add a decl to the binding level for the current function.  */
 630 void gfc_add_decl_to_function (tree);
 631
 632 /* Make prototypes for runtime library functions.  */
 633 void gfc_build_builtin_function_decls (void);
 634
 635 /* Set the backend source location of a decl.  */
 636 void gfc_set_decl_location (tree, locus *);
 637
 638 /* Get a module symbol backend_decl if possible.  */
 639 bool gfc_get_module_backend_decl (gfc_symbol *);
 640
 641 /* Return the variable decl for a symbol.  */
 642 tree gfc_get_symbol_decl (gfc_symbol *);
 643
 644 /* Build a static initializer.  */
 645 tree gfc_conv_initializer (gfc_expr *, gfc_typespec *, tree, bool, bool, bool);
 646
 647 /* Assign a default initializer to a derived type.  */
 648 void gfc_init_default_dt (gfc_symbol *, stmtblock_t *, bool);
 649
 650 /* Substitute a temporary variable in place of the real one.  */
 651 void gfc_shadow_sym (gfc_symbol *, tree, gfc_saved_var *);
 652
 653 /* Restore the original variable.  */
 654 void gfc_restore_sym (gfc_symbol *, gfc_saved_var *);
 655
 656 /* Setting a decl assembler name, mangling it according to target rules
 657    (like Windows @NN decorations).  */
 658 void gfc_set_decl_assembler_name (tree, tree);
 659
 660 /* Returns true if a variable of specified size should go on the stack.  */
 661 int gfc_can_put_var_on_stack (tree);
 662
 663 /* Set GFC_DECL_SCALAR_* on decl from sym if needed.  */
 664 void gfc_finish_decl_attrs (tree, symbol_attribute *);
 665
 666 /* Allocate the lang-specific part of a decl node.  */
 667 void gfc_allocate_lang_decl (tree);
 668
 669 /* Get the location suitable for the ME from a gfortran locus; required to get
 670    the column number right.  */
 671 location_t gfc_get_location (locus *);
 672
 673 /* Advance along a TREE_CHAIN.  */
 674 tree gfc_advance_chain (tree, int);
 675
 676 /* Create a decl for a function.  */
 677 void gfc_create_function_decl (gfc_namespace *, bool);
 678 /* Generate the code for a function.  */
 679 void gfc_generate_function_code (gfc_namespace *);
 680 /* Output a BLOCK DATA program unit.  */
 681 void gfc_generate_block_data (gfc_namespace *);
 682 /* Output a decl for a module variable.  */
 683 void gfc_generate_module_vars (gfc_namespace *);
 684 /* Get the appropriate return statement for a procedure.  */
 685 tree gfc_generate_return (void);
 686
 687 struct module_decl_hasher : ggc_ptr_hash<tree_node>
 688 {
 689   typedef const char *compare_type;
 690
 691   static hashval_t hash (tree);
 692   static bool equal (tree, const char *);
 693 };
 694
 695 struct GTY((for_user)) module_htab_entry {
 696   const char *name;
 697   tree namespace_decl;
 698   hash_table<module_decl_hasher> *GTY (()) decls;
 699 };
 700
 701 struct module_htab_entry *gfc_find_module (const char *);
 702 void gfc_module_add_decl (struct module_htab_entry *, tree);
 703
 704 /* Get and set the current location.  */
 705 void gfc_save_backend_locus (locus *);
 706 void gfc_set_backend_locus (locus *);
 707 void gfc_restore_backend_locus (locus *);
 708
 709 /* Handle static constructor functions.  */
 710 extern GTY(()) tree gfc_static_ctors;
 711 void gfc_generate_constructors (void);
 712
 713 /* Get the string length of an array constructor.  */
 714 bool get_array_ctor_strlen (stmtblock_t *, gfc_constructor_base, tree *);
 715
 716 /* Mark a condition as likely or unlikely.  */
 717 tree gfc_likely (tree, enum br_predictor);
 718 tree gfc_unlikely (tree, enum br_predictor);
 719
 720 /* Return the string length of a deferred character length component.  */
 721 bool gfc_deferred_strlen (gfc_component *, tree *);
 722
 723 /* Generate a runtime error call.  */
 724 tree gfc_trans_runtime_error (bool, locus*, const char*, ...);
 725
 726 /* Generate a runtime warning/error check.  */
 727 void gfc_trans_runtime_check (bool, bool, tree, stmtblock_t *, locus *,
 728                               const char *, ...);
 729
 730 /* Generate a runtime check for same string length.  */
 731 void gfc_trans_same_strlen_check (const char*, locus*, tree, tree,
 732                                   stmtblock_t*);
 733
 734 /* Generate a call to free().  */
 735 tree gfc_call_free (tree);
 736
 737 /* Allocate memory after performing a few checks.  */
 738 tree gfc_call_malloc (stmtblock_t *, tree, tree);
 739
 740 /* Build a memcpy call.  */
 741 tree gfc_build_memcpy_call (tree, tree, tree);
 742
 743 /* Register memory with the coarray library.  */
 744 void gfc_allocate_using_caf_lib (stmtblock_t *, tree, tree, tree, tree, tree,
 745                                  tree, gfc_coarray_regtype);
 746
 747 /* Allocate memory for allocatable variables, with optional status variable.  */
 748 void gfc_allocate_allocatable (stmtblock_t*, tree, tree, tree, tree,
 749                                tree, tree, tree, gfc_expr*, int);
 750
 751 /* Allocate memory, with optional status variable.  */
 752 void gfc_allocate_using_malloc (stmtblock_t *, tree, tree, tree);
 753
 754 /* Generate code to deallocate an array.  */
 755 tree gfc_deallocate_with_status (tree, tree, tree, tree, tree, bool,
 756                                  gfc_expr *, int, tree a = NULL_TREE,
 757                                  tree c = NULL_TREE);
 758 tree gfc_deallocate_scalar_with_status (tree, tree, tree, bool, gfc_expr*,
 759                                         gfc_typespec, bool c = false);
 760
 761 /* Generate code to call realloc().  */
 762 tree gfc_call_realloc (stmtblock_t *, tree, tree);
 763
 764 /* Assign a derived type constructor to a variable.  */
 765 tree gfc_trans_structure_assign (tree, gfc_expr *, bool, bool c = false);
 766
 767 /* Generate code for an assignment, includes scalarization.  */
 768 tree gfc_trans_assignment (gfc_expr *, gfc_expr *, bool, bool, bool p = false,
 769                            bool a = true);
 770
 771 /* Generate code for a pointer assignment.  */
 772 tree gfc_trans_pointer_assignment (gfc_expr *, gfc_expr *);
 773
 774 /* Initialize function decls for library functions.  */
 775 void gfc_build_intrinsic_lib_fndecls (void);
 776 /* Create function decls for IO library functions.  */
 777 void gfc_build_io_library_fndecls (void);
 778 /* Build a function decl for a library function.  */
 779 tree gfc_build_library_function_decl (tree, tree, int, ...);
 780 tree gfc_build_library_function_decl_with_spec (tree name, const char *spec,
 781                                                 tree rettype, int nargs, ...);
 782
 783 /* Process the local variable decls of a block construct.  */
 784 void gfc_process_block_locals (gfc_namespace*);
 785
 786 /* Output initialization/clean-up code that was deferred.  */
 787 void gfc_trans_deferred_vars (gfc_symbol*, gfc_wrapped_block *);
 788
 789 /* In f95-lang.c.  */
 790 tree pushdecl (tree);
 791 tree pushdecl_top_level (tree);
 792 void pushlevel (void);
 793 tree poplevel (int, int);
 794 tree getdecls (void);
 795
 796 /* In trans-types.c.  */
 797 struct array_descr_info;
 798 bool gfc_get_array_descr_info (const_tree, struct array_descr_info *);
 799
 800 /* In trans-openmp.c */
 801 bool gfc_omp_is_allocatable_or_ptr (const_tree);
 802 tree gfc_omp_check_optional_argument (tree, bool);
 803 tree gfc_omp_array_data (tree, bool);
 804 bool gfc_omp_privatize_by_reference (const_tree);
 805 enum omp_clause_default_kind gfc_omp_predetermined_sharing (tree);
 806 enum omp_clause_defaultmap_kind gfc_omp_predetermined_mapping (tree);
 807 tree gfc_omp_report_decl (tree);
 808 tree gfc_omp_clause_default_ctor (tree, tree, tree);
 809 tree gfc_omp_clause_copy_ctor (tree, tree, tree);
 810 tree gfc_omp_clause_assign_op (tree, tree, tree);
 811 tree gfc_omp_clause_linear_ctor (tree, tree, tree, tree);
 812 tree gfc_omp_clause_dtor (tree, tree);
 813 void gfc_omp_finish_clause (tree, gimple_seq *);
 814 bool gfc_omp_scalar_p (tree);
 815 bool gfc_omp_disregard_value_expr (tree, bool);
 816 bool gfc_omp_private_debug_clause (tree, bool);
 817 bool gfc_omp_private_outer_ref (tree);
 818 struct gimplify_omp_ctx;
 819 void gfc_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *, tree);
 820
 821 /* Runtime library function decls.  */
 822 extern GTY(()) tree gfor_fndecl_pause_numeric;
 823 extern GTY(()) tree gfor_fndecl_pause_string;
 824 extern GTY(()) tree gfor_fndecl_stop_numeric;
 825 extern GTY(()) tree gfor_fndecl_stop_string;
 826 extern GTY(()) tree gfor_fndecl_error_stop_numeric;
 827 extern GTY(()) tree gfor_fndecl_error_stop_string;
 828 extern GTY(()) tree gfor_fndecl_runtime_error;
 829 extern GTY(()) tree gfor_fndecl_runtime_error_at;
 830 extern GTY(()) tree gfor_fndecl_runtime_warning_at;
 831 extern GTY(()) tree gfor_fndecl_os_error_at;
 832 extern GTY(()) tree gfor_fndecl_generate_error;
 833 extern GTY(()) tree gfor_fndecl_set_fpe;
 834 extern GTY(()) tree gfor_fndecl_set_options;
 835 extern GTY(()) tree gfor_fndecl_ttynam;
 836 extern GTY(()) tree gfor_fndecl_ctime;
 837 extern GTY(()) tree gfor_fndecl_fdate;
 838 extern GTY(()) tree gfor_fndecl_in_pack;
 839 extern GTY(()) tree gfor_fndecl_in_unpack;
 840 extern GTY(()) tree gfor_fndecl_cfi_to_gfc;
 841 extern GTY(()) tree gfor_fndecl_gfc_to_cfi;
 842 extern GTY(()) tree gfor_fndecl_associated;
 843 extern GTY(()) tree gfor_fndecl_system_clock4;
 844 extern GTY(()) tree gfor_fndecl_system_clock8;
 845
 846
 847 /* Coarray run-time library function decls.  */
 848 extern GTY(()) tree gfor_fndecl_caf_init;
 849 extern GTY(()) tree gfor_fndecl_caf_finalize;
 850 extern GTY(()) tree gfor_fndecl_caf_this_image;
 851 extern GTY(()) tree gfor_fndecl_caf_num_images;
 852 extern GTY(()) tree gfor_fndecl_caf_register;
 853 extern GTY(()) tree gfor_fndecl_caf_deregister;
 854 extern GTY(()) tree gfor_fndecl_caf_get;
 855 extern GTY(()) tree gfor_fndecl_caf_send;
 856 extern GTY(()) tree gfor_fndecl_caf_sendget;
 857 extern GTY(()) tree gfor_fndecl_caf_get_by_ref;
 858 extern GTY(()) tree gfor_fndecl_caf_send_by_ref;
 859 extern GTY(()) tree gfor_fndecl_caf_sendget_by_ref;
 860 extern GTY(()) tree gfor_fndecl_caf_sync_all;
 861 extern GTY(()) tree gfor_fndecl_caf_sync_memory;
 862 extern GTY(()) tree gfor_fndecl_caf_sync_images;
 863 extern GTY(()) tree gfor_fndecl_caf_stop_numeric;
 864 extern GTY(()) tree gfor_fndecl_caf_stop_str;
 865 extern GTY(()) tree gfor_fndecl_caf_error_stop;
 866 extern GTY(()) tree gfor_fndecl_caf_error_stop_str;
 867 extern GTY(()) tree gfor_fndecl_caf_atomic_def;
 868 extern GTY(()) tree gfor_fndecl_caf_atomic_ref;
 869 extern GTY(()) tree gfor_fndecl_caf_atomic_cas;
 870 extern GTY(()) tree gfor_fndecl_caf_atomic_op;
 871 extern GTY(()) tree gfor_fndecl_caf_lock;
 872 extern GTY(()) tree gfor_fndecl_caf_unlock;
 873 extern GTY(()) tree gfor_fndecl_caf_event_post;
 874 extern GTY(()) tree gfor_fndecl_caf_event_wait;
 875 extern GTY(()) tree gfor_fndecl_caf_event_query;
 876 extern GTY(()) tree gfor_fndecl_caf_fail_image;
 877 extern GTY(()) tree gfor_fndecl_caf_failed_images;
 878 extern GTY(()) tree gfor_fndecl_caf_image_status;
 879 extern GTY(()) tree gfor_fndecl_caf_stopped_images;
 880 extern GTY(()) tree gfor_fndecl_caf_form_team;
 881 extern GTY(()) tree gfor_fndecl_caf_change_team;
 882 extern GTY(()) tree gfor_fndecl_caf_end_team;
 883 extern GTY(()) tree gfor_fndecl_caf_get_team;
 884 extern GTY(()) tree gfor_fndecl_caf_sync_team;
 885 extern GTY(()) tree gfor_fndecl_caf_team_number;
 886 extern GTY(()) tree gfor_fndecl_co_broadcast;
 887 extern GTY(()) tree gfor_fndecl_co_max;
 888 extern GTY(()) tree gfor_fndecl_co_min;
 889 extern GTY(()) tree gfor_fndecl_co_reduce;
 890 extern GTY(()) tree gfor_fndecl_co_sum;
 891 extern GTY(()) tree gfor_fndecl_caf_is_present;
 892
 893 /* Math functions.  Many other math functions are handled in
 894    trans-intrinsic.c.  */
 895
 896 typedef struct GTY(()) gfc_powdecl_list {
 897   tree integer;
 898   tree real;
 899   tree cmplx;
 900 }
 901 gfc_powdecl_list;
 902
 903 extern GTY(()) gfc_powdecl_list gfor_fndecl_math_powi[4][3];
 904 extern GTY(()) tree gfor_fndecl_math_ishftc4;
 905 extern GTY(()) tree gfor_fndecl_math_ishftc8;
 906 extern GTY(()) tree gfor_fndecl_math_ishftc16;
 907
 908 /* BLAS functions.  */
 909 extern GTY(()) tree gfor_fndecl_sgemm;
 910 extern GTY(()) tree gfor_fndecl_dgemm;
 911 extern GTY(()) tree gfor_fndecl_cgemm;
 912 extern GTY(()) tree gfor_fndecl_zgemm;
 913
 914 /* String functions.  */
 915 extern GTY(()) tree gfor_fndecl_compare_string;
 916 extern GTY(()) tree gfor_fndecl_concat_string;
 917 extern GTY(()) tree gfor_fndecl_string_len_trim;
 918 extern GTY(()) tree gfor_fndecl_string_index;
 919 extern GTY(()) tree gfor_fndecl_string_scan;
 920 extern GTY(()) tree gfor_fndecl_string_verify;
 921 extern GTY(()) tree gfor_fndecl_string_trim;
 922 extern GTY(()) tree gfor_fndecl_string_minmax;
 923 extern GTY(()) tree gfor_fndecl_adjustl;
 924 extern GTY(()) tree gfor_fndecl_adjustr;
 925 extern GTY(()) tree gfor_fndecl_select_string;
 926 extern GTY(()) tree gfor_fndecl_compare_string_char4;
 927 extern GTY(()) tree gfor_fndecl_concat_string_char4;
 928 extern GTY(()) tree gfor_fndecl_string_len_trim_char4;
 929 extern GTY(()) tree gfor_fndecl_string_index_char4;
 930 extern GTY(()) tree gfor_fndecl_string_scan_char4;
 931 extern GTY(()) tree gfor_fndecl_string_verify_char4;
 932 extern GTY(()) tree gfor_fndecl_string_trim_char4;
 933 extern GTY(()) tree gfor_fndecl_string_minmax_char4;
 934 extern GTY(()) tree gfor_fndecl_adjustl_char4;
 935 extern GTY(()) tree gfor_fndecl_adjustr_char4;
 936 extern GTY(()) tree gfor_fndecl_select_string_char4;
 937
 938 /* Conversion between character kinds.  */
 939 extern GTY(()) tree gfor_fndecl_convert_char1_to_char4;
 940 extern GTY(()) tree gfor_fndecl_convert_char4_to_char1;
 941
 942 /* Other misc. runtime library functions.  */
 943 extern GTY(()) tree gfor_fndecl_size0;
 944 extern GTY(()) tree gfor_fndecl_size1;
 945 extern GTY(()) tree gfor_fndecl_iargc;
 946 extern GTY(()) tree gfor_fndecl_kill;
 947 extern GTY(()) tree gfor_fndecl_kill_sub;
 948 extern GTY(()) tree gfor_fndecl_is_contiguous0;
 949
 950 /* Implemented in Fortran.  */
 951 extern GTY(()) tree gfor_fndecl_sc_kind;
 952 extern GTY(()) tree gfor_fndecl_si_kind;
 953 extern GTY(()) tree gfor_fndecl_sr_kind;
 954
 955 /* IEEE-related.  */
 956 extern GTY(()) tree gfor_fndecl_ieee_procedure_entry;
 957 extern GTY(()) tree gfor_fndecl_ieee_procedure_exit;
 958
 959 /* RANDOM_INIT.  */
 960 extern GTY(()) tree gfor_fndecl_random_init;
 961
 962 /* True if node is an integer constant.  */
 963 #define INTEGER_CST_P(node) (TREE_CODE(node) == INTEGER_CST)
 964
 965 /* gfortran-specific declaration information, the _CONT versions denote
 966    arrays with CONTIGUOUS attribute.  */
 967
 968 #define GFC_DTYPE_ELEM_LEN 0
 969 #define GFC_DTYPE_VERSION 1
 970 #define GFC_DTYPE_RANK 2
 971 #define GFC_DTYPE_TYPE 3
 972 #define GFC_DTYPE_ATTRIBUTE 4
 973
 974 enum gfc_array_kind
 975 {
 976   GFC_ARRAY_UNKNOWN,
 977   GFC_ARRAY_ASSUMED_SHAPE,
 978   GFC_ARRAY_ASSUMED_SHAPE_CONT,
 979   GFC_ARRAY_ASSUMED_RANK,
 980   GFC_ARRAY_ASSUMED_RANK_CONT,
 981   GFC_ARRAY_ALLOCATABLE,
 982   GFC_ARRAY_POINTER,
 983   GFC_ARRAY_POINTER_CONT
 984 };
 985
 986 /* Array types only.  */
 987 struct GTY(())  lang_type        {
 988   int rank, corank;
 989   enum gfc_array_kind akind;
 990   tree lbound[GFC_MAX_DIMENSIONS];
 991   tree ubound[GFC_MAX_DIMENSIONS];
 992   tree stride[GFC_MAX_DIMENSIONS];
 993   tree size;
 994   tree offset;
 995   tree dtype;
 996   tree dataptr_type;
 997   tree base_decl[2];
 998   tree nonrestricted_type;
 999   tree caf_token;
1000   tree caf_offset;
1001 };
1002
1003 struct GTY(()) lang_decl {
1004   /* Dummy variables.  */
1005   tree saved_descriptor;
1006   /* Assigned integer nodes.  Stringlength is the IO format string's length.
1007      Addr is the address of the string or the target label. Stringlength is
1008      initialized to -2 and assigned to -1 when addr is assigned to the
1009      address of target label.  */
1010   tree stringlen;
1011   tree addr;
1012   /* For assumed-shape coarrays.  */
1013   tree token, caf_offset;
1014   unsigned int scalar_allocatable : 1;
1015   unsigned int scalar_pointer : 1;
1016   unsigned int optional_arg : 1;
1017 };
1018
1019
1020 #define GFC_DECL_ASSIGN_ADDR(node) DECL_LANG_SPECIFIC(node)->addr
1021 #define GFC_DECL_STRING_LEN(node) DECL_LANG_SPECIFIC(node)->stringlen
1022 #define GFC_DECL_TOKEN(node) DECL_LANG_SPECIFIC(node)->token
1023 #define GFC_DECL_CAF_OFFSET(node) DECL_LANG_SPECIFIC(node)->caf_offset
1024 #define GFC_DECL_SAVED_DESCRIPTOR(node) \
1025   (DECL_LANG_SPECIFIC(node)->saved_descriptor)
1026 #define GFC_DECL_SCALAR_ALLOCATABLE(node) \
1027   (DECL_LANG_SPECIFIC (node)->scalar_allocatable)
1028 #define GFC_DECL_SCALAR_POINTER(node) \
1029   (DECL_LANG_SPECIFIC (node)->scalar_pointer)
1030 #define GFC_DECL_OPTIONAL_ARGUMENT(node) \
1031   (DECL_LANG_SPECIFIC (node)->optional_arg)
1032 #define GFC_DECL_GET_SCALAR_ALLOCATABLE(node) \
1033   (DECL_LANG_SPECIFIC (node) ? GFC_DECL_SCALAR_ALLOCATABLE (node) : 0)
1034 #define GFC_DECL_GET_SCALAR_POINTER(node) \
1035   (DECL_LANG_SPECIFIC (node) ? GFC_DECL_SCALAR_POINTER (node) : 0)
1036 #define GFC_DECL_PACKED_ARRAY(node) DECL_LANG_FLAG_0(node)
1037 #define GFC_DECL_PARTIAL_PACKED_ARRAY(node) DECL_LANG_FLAG_1(node)
1038 #define GFC_DECL_ASSIGN(node) DECL_LANG_FLAG_2(node)
1039 #define GFC_DECL_COMMON_OR_EQUIV(node) DECL_LANG_FLAG_3(node)
1040 #define GFC_DECL_CRAY_POINTEE(node) DECL_LANG_FLAG_4(node)
1041 #define GFC_DECL_RESULT(node) DECL_LANG_FLAG_5(node)
1042 #define GFC_DECL_PTR_ARRAY_P(node) DECL_LANG_FLAG_6(node)
1043 #define GFC_DECL_ASSOCIATE_VAR_P(node) DECL_LANG_FLAG_7(node)
1044 #define GFC_DECL_CLASS(node) DECL_LANG_FLAG_8(node)
1045
1046 /* An array descriptor.  */
1047 #define GFC_DESCRIPTOR_TYPE_P(node) TYPE_LANG_FLAG_1(node)
1048 /* An array without a descriptor.  */
1049 #define GFC_ARRAY_TYPE_P(node) TYPE_LANG_FLAG_2(node)
1050 /* Fortran CLASS type.  */
1051 #define GFC_CLASS_TYPE_P(node) TYPE_LANG_FLAG_4(node)
1052 /* The GFC_TYPE_ARRAY_* members are present in both descriptor and
1053    descriptorless array types.  */
1054 #define GFC_TYPE_ARRAY_LBOUND(node, dim) \
1055   (TYPE_LANG_SPECIFIC(node)->lbound[dim])
1056 #define GFC_TYPE_ARRAY_UBOUND(node, dim) \
1057   (TYPE_LANG_SPECIFIC(node)->ubound[dim])
1058 #define GFC_TYPE_ARRAY_STRIDE(node, dim) \
1059   (TYPE_LANG_SPECIFIC(node)->stride[dim])
1060 #define GFC_TYPE_ARRAY_RANK(node) (TYPE_LANG_SPECIFIC(node)->rank)
1061 #define GFC_TYPE_ARRAY_CORANK(node) (TYPE_LANG_SPECIFIC(node)->corank)
1062 #define GFC_TYPE_ARRAY_CAF_TOKEN(node) (TYPE_LANG_SPECIFIC(node)->caf_token)
1063 #define GFC_TYPE_ARRAY_CAF_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->caf_offset)
1064 #define GFC_TYPE_ARRAY_SIZE(node) (TYPE_LANG_SPECIFIC(node)->size)
1065 #define GFC_TYPE_ARRAY_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->offset)
1066 #define GFC_TYPE_ARRAY_AKIND(node) (TYPE_LANG_SPECIFIC(node)->akind)
1067 /* Code should use gfc_get_dtype instead of accessing this directly.  It may
1068    not be known when the type is created.  */
1069 #define GFC_TYPE_ARRAY_DTYPE(node) (TYPE_LANG_SPECIFIC(node)->dtype)
1070 #define GFC_TYPE_ARRAY_DATAPTR_TYPE(node) \
1071   (TYPE_LANG_SPECIFIC(node)->dataptr_type)
1072 #define GFC_TYPE_ARRAY_BASE_DECL(node, internal) \
1073   (TYPE_LANG_SPECIFIC(node)->base_decl[(internal)])
1074
1075
1076 /* Build an expression with void type.  */
1077 #define build1_v(code, arg) \
1078         fold_build1_loc (input_location, code, void_type_node, arg)
1079 #define build2_v(code, arg1, arg2) \
1080         fold_build2_loc (input_location, code, void_type_node, arg1, arg2)
1081 #define build3_v(code, arg1, arg2, arg3) \
1082         fold_build3_loc (input_location, code, void_type_node, arg1, arg2, arg3)
1083 #define build4_v(code, arg1, arg2, arg3, arg4) \
1084         build4_loc (input_location, code, void_type_node, arg1, arg2, \
1085                     arg3, arg4)
1086
1087 /* This group of functions allows a caller to evaluate an expression from
1088    the callee's interface.  It establishes a mapping between the interface's
1089    dummy arguments and the caller's actual arguments, then applies that
1090    mapping to a given gfc_expr.
1091
1092    You can initialize a mapping structure like so:
1093
1094        gfc_interface_mapping mapping;
1095        ...
1096        gfc_init_interface_mapping (&mapping);
1097
1098    You should then evaluate each actual argument into a temporary
1099    gfc_se structure, here called "se", and map the result to the
1100    dummy argument's symbol, here called "sym":
1101
1102        gfc_add_interface_mapping (&mapping, sym, &se);
1103
1104    After adding all mappings, you should call:
1105
1106        gfc_finish_interface_mapping (&mapping, pre, post);
1107
1108    where "pre" and "post" are statement blocks for initialization
1109    and finalization code respectively.  You can then evaluate an
1110    interface expression "expr" as follows:
1111
1112        gfc_apply_interface_mapping (&mapping, se, expr);
1113
1114    Once you've evaluated all expressions, you should free
1115    the mapping structure with:
1116
1117        gfc_free_interface_mapping (&mapping); */
1118
1119
1120 /* This structure represents a mapping from OLD to NEW, where OLD is a
1121    dummy argument symbol and NEW is a symbol that represents the value
1122    of an actual argument.  Mappings are linked together using NEXT
1123    (in no particular order).  */
1124 typedef struct gfc_interface_sym_mapping
1125 {
1126   struct gfc_interface_sym_mapping *next;
1127   gfc_symbol *old;
1128   gfc_symtree *new_sym;
1129   gfc_expr *expr;
1130 }
1131 gfc_interface_sym_mapping;
1132
1133
1134 /* This structure is used by callers to evaluate an expression from
1135    a callee's interface.  */
1136 typedef struct gfc_interface_mapping
1137 {
1138   /* Maps the interface's dummy arguments to the values that the caller
1139      is passing.  The whole list is owned by this gfc_interface_mapping.  */
1140   gfc_interface_sym_mapping *syms;
1141
1142   /* A list of gfc_charlens that were needed when creating copies of
1143      expressions.  The whole list is owned by this gfc_interface_mapping.  */
1144   gfc_charlen *charlens;
1145 }
1146 gfc_interface_mapping;
1147
1148 void gfc_init_interface_mapping (gfc_interface_mapping *);
1149 void gfc_free_interface_mapping (gfc_interface_mapping *);
1150 void gfc_add_interface_mapping (gfc_interface_mapping *,
1151                                 gfc_symbol *, gfc_se *, gfc_expr *);
1152 void gfc_finish_interface_mapping (gfc_interface_mapping *,
1153                                    stmtblock_t *, stmtblock_t *);
1154 void gfc_apply_interface_mapping (gfc_interface_mapping *,
1155                                   gfc_se *, gfc_expr *);
1156
1157
1158 /* Standard error messages used in all the trans-*.c files.  */
1159 extern const char gfc_msg_fault[];
1160 extern const char gfc_msg_wrong_return[];
1161
1162 #define OMPWS_WORKSHARE_FLAG    1       /* Set if in a workshare construct.  */
1163 #define OMPWS_CURR_SINGLEUNIT   2       /* Set if current gfc_code in workshare
1164                                            construct is not workshared.  */
1165 #define OMPWS_SCALARIZER_WS     4       /* Set if scalarizer should attempt
1166                                            to create parallel loops.  */
1167 #define OMPWS_SCALARIZER_BODY   8       /* Set if handling body of potential
1168                                            parallel loop.  */
1169 #define OMPWS_NOWAIT            16      /* Use NOWAIT on OMP_FOR.  */
1170 extern int ompws_flags;
1171
1172 #endif /* GFC_TRANS_H */