gcc/fortran/trans.h

   1 /* Header for code translation functions
   2    Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
   3    2011, 2012
   4    Free Software Foundation, Inc.
   5    Contributed by Paul Brook
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify it under
  10 the terms of the GNU General Public License as published by the Free
  11 Software Foundation; either version 3, or (at your option) any later
  12 version.
  13
  14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17 for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.  */
  22
  23 #ifndef GFC_TRANS_H
  24 #define GFC_TRANS_H
  25
  26 /* Mangled symbols take the form __module__name.  */
  27 #define GFC_MAX_MANGLED_SYMBOL_LEN  (GFC_MAX_SYMBOL_LEN*2+4)
  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   /* If set gfc_conv_variable will return an expression for the array
  53      descriptor. When set, want_pointer should also be set.
  54      If not set scalarizing variables will be substituted.  */
  55   unsigned descriptor_only:1;
  56
  57   /* When this is set gfc_conv_expr returns the address of a variable.  Only
  58      applies to EXPR_VARIABLE nodes.
  59      Also used by gfc_conv_array_parameter. When set this indicates a pointer
  60      to the descriptor should be returned, rather than the descriptor itself.
  61    */
  62   unsigned want_pointer:1;
  63
  64   /* An array function call returning without a temporary.  Also used for array
  65      pointer assignments.  */
  66   unsigned direct_byref:1;
  67
  68   /* If direct_byref is set, do work out the descriptor as in that case but
  69      do still create a new descriptor variable instead of using an
  70      existing one.  This is useful for special pointer assignments like
  71      rank remapping where we have to process the descriptor before
  72      assigning to final one.  */
  73   unsigned byref_noassign:1;
  74
  75   /* Ignore absent optional arguments.  Used for some intrinsics.  */
  76   unsigned ignore_optional:1;
  77
  78   /* When this is set the data and offset fields of the returned descriptor
  79      are NULL.  Used by intrinsic size.  */
  80   unsigned data_not_needed:1;
  81
  82   /* If set, gfc_conv_procedure_call does not put byref calls into se->pre.  */
  83   unsigned no_function_call:1;
  84
  85   /* If set, we will force the creation of a temporary. Useful to disable
  86      non-copying procedure argument passing optimizations, when some function
  87      args alias.  */
  88   unsigned force_tmp:1;
  89
  90   unsigned want_coarray:1;
  91
  92   /* Scalarization parameters.  */
  93   struct gfc_se *parent;
  94   struct gfc_ss *ss;
  95   struct gfc_loopinfo *loop;
  96 }
  97 gfc_se;
  98
  99
 100 /* Denotes different types of coarray.
 101    Please keep in sync with libgfortran/caf/libcaf.h.  */
 102 typedef enum
 103 {
 104   GFC_CAF_COARRAY_STATIC,
 105   GFC_CAF_COARRAY_ALLOC,
 106   GFC_CAF_LOCK,
 107   GFC_CAF_LOCK_COMP
 108 }
 109 gfc_coarray_type;
 110
 111
 112 /* The array-specific scalarization informations.  The array members of
 113    this struct are indexed by actual array index, and thus can be sparse.  */
 114
 115 typedef struct gfc_array_info
 116 {
 117   mpz_t *shape;
 118
 119   /* The ref that holds information on this section.  */
 120   gfc_ref *ref;
 121   /* The descriptor of this array.  */
 122   tree descriptor;
 123   /* holds the pointer to the data array.  */
 124   tree data;
 125   /* To move some of the array index calculation out of the innermost loop.  */
 126   tree offset;
 127   tree saved_offset;
 128   tree stride0;
 129   /* Holds the SS for a subscript.  Indexed by actual dimension.  */
 130   struct gfc_ss *subscript[GFC_MAX_DIMENSIONS];
 131
 132   /* stride and delta are used to access this inside a scalarization loop.
 133      start is used in the calculation of these.  Indexed by scalarizer
 134      dimension.  */
 135   tree start[GFC_MAX_DIMENSIONS];
 136   tree end[GFC_MAX_DIMENSIONS];
 137   tree stride[GFC_MAX_DIMENSIONS];
 138   tree delta[GFC_MAX_DIMENSIONS];
 139 }
 140 gfc_array_info;
 141
 142 typedef enum
 143 {
 144   /* A scalar value.  This will be evaluated before entering the
 145      scalarization loop.  */
 146   GFC_SS_SCALAR,
 147
 148   /* Like GFC_SS_SCALAR it evaluates the expression outside the
 149      loop.  Is always evaluated as a reference to the temporary, unless
 150      temporary evaluation can result in a NULL pointer dereferencing (case of
 151      optional arguments).  Used for elemental function arguments.  */
 152   GFC_SS_REFERENCE,
 153
 154   /* An array section.  Scalarization indices will be substituted during
 155      expression translation.  */
 156   GFC_SS_SECTION,
 157
 158   /* A non-elemental function call returning an array.  The call is executed
 159      before entering the scalarization loop, storing the result in a
 160      temporary.  This temporary is then used inside the scalarization loop.
 161      Simple assignments, e.g. a(:) = fn(), are handled without a temporary
 162      as a special case.  */
 163   GFC_SS_FUNCTION,
 164
 165   /* An array constructor.  The current implementation is sub-optimal in
 166      many cases.  It allocated a temporary, assigns the values to it, then
 167      uses this temporary inside the scalarization loop.  */
 168   GFC_SS_CONSTRUCTOR,
 169
 170   /* A vector subscript.  The vector's descriptor is cached in the
 171      "descriptor" field of the associated gfc_ss_info.  */
 172   GFC_SS_VECTOR,
 173
 174   /* A temporary array allocated by the scalarizer.  Its rank can be less
 175      than that of the assignment expression.  */
 176   GFC_SS_TEMP,
 177
 178   /* An intrinsic function call.  Many intrinsic functions which map directly
 179      to library calls are created as GFC_SS_FUNCTION nodes.  */
 180   GFC_SS_INTRINSIC,
 181
 182   /* A component of a derived type.  */
 183   GFC_SS_COMPONENT
 184 }
 185 gfc_ss_type;
 186
 187
 188 typedef struct gfc_ss_info
 189 {
 190   int refcount;
 191   gfc_ss_type type;
 192   gfc_expr *expr;
 193   tree string_length;
 194
 195   union
 196   {
 197     /* If type is GFC_SS_SCALAR or GFC_SS_REFERENCE.  */
 198     struct
 199     {
 200       tree value;
 201       /* Tells whether the reference can be null in the GFC_SS_REFERENCE case.
 202          Used to handle elemental procedures' optional arguments.  */
 203       bool can_be_null_ref;
 204     }
 205     scalar;
 206
 207     /* GFC_SS_TEMP.  */
 208     struct
 209     {
 210       tree type;
 211     }
 212     temp;
 213
 214     /* All other types.  */
 215     gfc_array_info array;
 216   }
 217   data;
 218
 219   /* This is used by assignments requiring temporaries.  The bits specify which
 220      loops the terms appear in.  This will be 1 for the RHS expressions,
 221      2 for the LHS expressions, and 3(=1|2) for the temporary.  */
 222   unsigned useflags:2;
 223
 224   /* Suppresses precalculation of scalars in WHERE assignments.  */
 225   unsigned where:1;
 226 }
 227 gfc_ss_info;
 228
 229 #define gfc_get_ss_info() XCNEW (gfc_ss_info)
 230
 231
 232 /* Scalarization State chain.  Created by walking an expression tree before
 233    creating the scalarization loops.  Then passed as part of a gfc_se structure
 234    to translate the expression inside the loop.  Note that these chains are
 235    terminated by gfc_ss_terminator, not NULL.  A NULL pointer in a gfc_se
 236    indicates to gfc_conv_* that this is a scalar expression.
 237    SS structures can only belong to a single loopinfo.  They must be added
 238    otherwise they will not get freed.  */
 239
 240 typedef struct gfc_ss
 241 {
 242   gfc_ss_info *info;
 243
 244   int dimen;
 245   /* Translation from loop dimensions to actual array dimensions.
 246      actual_dim = dim[loop_dim]  */
 247   int dim[GFC_MAX_DIMENSIONS];
 248
 249   /* All the SS in a loop and linked through loop_chain.  The SS for an
 250      expression are linked by the next pointer.  */
 251   struct gfc_ss *loop_chain;
 252   struct gfc_ss *next;
 253
 254   /* Non-null if the ss is part of a nested loop.  */
 255   struct gfc_ss *parent;
 256
 257   /* If the evaluation of an expression requires a nested loop (for example
 258      if the sum intrinsic is evaluated inline), this points to the nested
 259      loop's gfc_ss.  */
 260   struct gfc_ss *nested_ss;
 261
 262   /* The loop this gfc_ss is in.  */
 263   struct gfc_loopinfo *loop;
 264
 265   unsigned is_alloc_lhs:1;
 266 }
 267 gfc_ss;
 268 #define gfc_get_ss() XCNEW (gfc_ss)
 269
 270 /* The contents of this aren't actually used.  A NULL SS chain indicates a
 271    scalar expression, so this pointer is used to terminate SS chains.  */
 272 extern gfc_ss * const gfc_ss_terminator;
 273
 274 /* Holds information about an expression while it is being scalarized.  */
 275 typedef struct gfc_loopinfo
 276 {
 277   stmtblock_t pre;
 278   stmtblock_t post;
 279
 280   int dimen;
 281
 282   /* All the SS involved with this loop.  */
 283   gfc_ss *ss;
 284   /* The SS describing the temporary used in an assignment.  */
 285   gfc_ss *temp_ss;
 286
 287   /* Non-null if this loop is nested in another one.  */
 288   struct gfc_loopinfo *parent;
 289
 290   /* Chain of nested loops.  */
 291   struct gfc_loopinfo *nested, *next;
 292
 293   /* The scalarization loop index variables.  */
 294   tree loopvar[GFC_MAX_DIMENSIONS];
 295
 296   /* The bounds of the scalarization loops.  */
 297   tree from[GFC_MAX_DIMENSIONS];
 298   tree to[GFC_MAX_DIMENSIONS];
 299   gfc_ss *specloop[GFC_MAX_DIMENSIONS];
 300
 301   /* The code member contains the code for the body of the next outer loop.  */
 302   stmtblock_t code[GFC_MAX_DIMENSIONS];
 303
 304   /* Order in which the dimensions should be looped, innermost first.  */
 305   int order[GFC_MAX_DIMENSIONS];
 306
 307   /* Enum to control loop reversal.  */
 308   gfc_reverse reverse[GFC_MAX_DIMENSIONS];
 309
 310   /* The number of dimensions for which a temporary is used.  */
 311   int temp_dim;
 312
 313   /* If set we don't need the loop variables.  */
 314   unsigned array_parameter:1;
 315 }
 316 gfc_loopinfo;
 317
 318 #define gfc_get_loopinfo() XCNEW (gfc_loopinfo)
 319
 320 /* Information about a symbol that has been shadowed by a temporary.  */
 321 typedef struct
 322 {
 323   symbol_attribute attr;
 324   tree decl;
 325 }
 326 gfc_saved_var;
 327
 328
 329 /* Store information about a block of code together with special
 330    initialization and clean-up code.  This can be used to incrementally add
 331    init and cleanup, and in the end put everything together to a
 332    try-finally expression.  */
 333 typedef struct
 334 {
 335   tree init;
 336   tree cleanup;
 337   tree code;
 338 }
 339 gfc_wrapped_block;
 340
 341 /* Class API functions.  */
 342 tree gfc_class_data_get (tree);
 343 tree gfc_class_vptr_get (tree);
 344 tree gfc_vtable_hash_get (tree);
 345 tree gfc_vtable_size_get (tree);
 346 tree gfc_vtable_extends_get (tree);
 347 tree gfc_vtable_def_init_get (tree);
 348 tree gfc_vtable_copy_get (tree);
 349
 350 /* Initialize an init/cleanup block.  */
 351 void gfc_start_wrapped_block (gfc_wrapped_block* block, tree code);
 352 /* Add a pair of init/cleanup code to the block.  Each one might be a
 353    NULL_TREE if not required.  */
 354 void gfc_add_init_cleanup (gfc_wrapped_block* block, tree init, tree cleanup);
 355 /* Finalize the block, that is, create a single expression encapsulating the
 356    original code together with init and clean-up code.  */
 357 tree gfc_finish_wrapped_block (gfc_wrapped_block* block);
 358
 359
 360 /* Advance the SS chain to the next term.  */
 361 void gfc_advance_se_ss_chain (gfc_se *);
 362
 363 /* Call this to initialize a gfc_se structure before use
 364    first parameter is structure to initialize, second is
 365    parent to get scalarization data from, or NULL.  */
 366 void gfc_init_se (gfc_se *, gfc_se *);
 367
 368 /* Create an artificial variable decl and add it to the current scope.  */
 369 tree gfc_create_var (tree, const char *);
 370 /* Like above but doesn't add it to the current scope.  */
 371 tree gfc_create_var_np (tree, const char *);
 372
 373 /* Store the result of an expression in a temp variable so it can be used
 374    repeatedly even if the original changes */
 375 void gfc_make_safe_expr (gfc_se * se);
 376
 377 /* Makes sure se is suitable for passing as a function string parameter.  */
 378 void gfc_conv_string_parameter (gfc_se * se);
 379
 380 /* Compare two strings.  */
 381 tree gfc_build_compare_string (tree, tree, tree, tree, int, enum tree_code);
 382
 383 /* When using the gfc_conv_* make sure you understand what they do, i.e.
 384    when a POST chain may be created, and what the returned expression may be
 385    used for.  Note that character strings have special handling.  This
 386    should not be a problem as most statements/operations only deal with
 387    numeric/logical types.  See the implementations in trans-expr.c
 388    for details of the individual functions.  */
 389
 390 void gfc_conv_expr (gfc_se * se, gfc_expr * expr);
 391 void gfc_conv_expr_val (gfc_se * se, gfc_expr * expr);
 392 void gfc_conv_expr_lhs (gfc_se * se, gfc_expr * expr);
 393 void gfc_conv_expr_reference (gfc_se * se, gfc_expr *);
 394 void gfc_conv_expr_type (gfc_se * se, gfc_expr *, tree);
 395
 396 /* trans-expr.c */
 397 void gfc_conv_scalar_char_value (gfc_symbol *sym, gfc_se *se, gfc_expr **expr);
 398 tree gfc_string_to_single_character (tree len, tree str, int kind);
 399
 400 /* Find the decl containing the auxiliary variables for assigned variables.  */
 401 void gfc_conv_label_variable (gfc_se * se, gfc_expr * expr);
 402 /* If the value is not constant, Create a temporary and copy the value.  */
 403 tree gfc_evaluate_now_loc (location_t, tree, stmtblock_t *);
 404 tree gfc_evaluate_now (tree, stmtblock_t *);
 405
 406 /* Find the appropriate variant of a math intrinsic.  */
 407 tree gfc_builtin_decl_for_float_kind (enum built_in_function, int);
 408
 409 /* Intrinsic procedure handling.  */
 410 tree gfc_conv_intrinsic_subroutine (gfc_code *);
 411 void gfc_conv_intrinsic_function (gfc_se *, gfc_expr *);
 412
 413 /* Does an intrinsic map directly to an external library call
 414    This is true for array-returning intrinsics, unless
 415    gfc_inline_intrinsic_function_p returns true.  */
 416 int gfc_is_intrinsic_libcall (gfc_expr *);
 417
 418 /* Used to call ordinary functions/subroutines
 419    and procedure pointer components.  */
 420 int gfc_conv_procedure_call (gfc_se *, gfc_symbol *, gfc_actual_arglist *,
 421                              gfc_expr *, VEC(tree,gc) *);
 422
 423 void gfc_conv_subref_array_arg (gfc_se *, gfc_expr *, int, sym_intent, bool);
 424
 425 /* gfc_trans_* shouldn't call push/poplevel, use gfc_push/pop_scope */
 426
 427 /* Generate code for a scalar assignment.  */
 428 tree gfc_trans_scalar_assign (gfc_se *, gfc_se *, gfc_typespec, bool, bool,
 429                               bool);
 430
 431 /* Translate COMMON blocks.  */
 432 void gfc_trans_common (gfc_namespace *);
 433
 434 /* Translate a derived type constructor.  */
 435 void gfc_conv_structure (gfc_se *, gfc_expr *, int);
 436
 437 /* Return an expression which determines if a dummy parameter is present.  */
 438 tree gfc_conv_expr_present (gfc_symbol *);
 439 /* Convert a missing, dummy argument into a null or zero.  */
 440 void gfc_conv_missing_dummy (gfc_se *, gfc_expr *, gfc_typespec, int);
 441
 442 /* Generate code to allocate a string temporary.  */
 443 tree gfc_conv_string_tmp (gfc_se *, tree, tree);
 444 /* Get the string length variable belonging to an expression.  */
 445 tree gfc_get_expr_charlen (gfc_expr *);
 446 /* Initialize a string length variable.  */
 447 void gfc_conv_string_length (gfc_charlen *, gfc_expr *, stmtblock_t *);
 448 /* Ensure type sizes can be gimplified.  */
 449 void gfc_trans_vla_type_sizes (gfc_symbol *, stmtblock_t *);
 450
 451 /* Add an expression to the end of a block.  */
 452 void gfc_add_expr_to_block (stmtblock_t *, tree);
 453 /* Add an expression to the beginning of a block.  */
 454 void gfc_prepend_expr_to_block (stmtblock_t *, tree);
 455 /* Add a block to the end of a block.  */
 456 void gfc_add_block_to_block (stmtblock_t *, stmtblock_t *);
 457 /* Add a MODIFY_EXPR to a block.  */
 458 void gfc_add_modify_loc (location_t, stmtblock_t *, tree, tree);
 459 void gfc_add_modify (stmtblock_t *, tree, tree);
 460
 461 /* Initialize a statement block.  */
 462 void gfc_init_block (stmtblock_t *);
 463 /* Start a new statement block.  Like gfc_init_block but also starts a new
 464    variable scope.  */
 465 void gfc_start_block (stmtblock_t *);
 466 /* Finish a statement block.  Also closes the scope if the block was created
 467    with gfc_start_block.  */
 468 tree gfc_finish_block (stmtblock_t *);
 469 /* Merge the scope of a block with its parent.  */
 470 void gfc_merge_block_scope (stmtblock_t * block);
 471
 472 /* Return the backend label decl.  */
 473 tree gfc_get_label_decl (gfc_st_label *);
 474
 475 /* Return the decl for an external function.  */
 476 tree gfc_get_extern_function_decl (gfc_symbol *);
 477
 478 /* Return the decl for a function.  */
 479 tree gfc_get_function_decl (gfc_symbol *);
 480
 481 /* Build an ADDR_EXPR.  */
 482 tree gfc_build_addr_expr (tree, tree);
 483
 484 /* Build an ARRAY_REF.  */
 485 tree gfc_build_array_ref (tree, tree, tree);
 486
 487 /* Creates a label.  Decl is artificial if label_id == NULL_TREE.  */
 488 tree gfc_build_label_decl (tree);
 489
 490 /* Return the decl used to hold the function return value.
 491    Do not use if the function has an explicit result variable.  */
 492 tree gfc_get_fake_result_decl (gfc_symbol *, int);
 493
 494 /* Add a decl to the binding level for the current function.  */
 495 void gfc_add_decl_to_function (tree);
 496
 497 /* Make prototypes for runtime library functions.  */
 498 void gfc_build_builtin_function_decls (void);
 499
 500 /* Set the backend source location of a decl.  */
 501 void gfc_set_decl_location (tree, locus *);
 502
 503 /* Get a module symbol backend_decl if possible.  */
 504 bool gfc_get_module_backend_decl (gfc_symbol *);
 505
 506 /* Return the variable decl for a symbol.  */
 507 tree gfc_get_symbol_decl (gfc_symbol *);
 508
 509 /* Build a static initializer.  */
 510 tree gfc_conv_initializer (gfc_expr *, gfc_typespec *, tree, bool, bool, bool);
 511
 512 /* Assign a default initializer to a derived type.  */
 513 void gfc_init_default_dt (gfc_symbol *, stmtblock_t *, bool);
 514
 515 /* Substitute a temporary variable in place of the real one.  */
 516 void gfc_shadow_sym (gfc_symbol *, tree, gfc_saved_var *);
 517
 518 /* Restore the original variable.  */
 519 void gfc_restore_sym (gfc_symbol *, gfc_saved_var *);
 520
 521 /* Setting a decl assembler name, mangling it according to target rules
 522    (like Windows @NN decorations).  */
 523 void gfc_set_decl_assembler_name (tree, tree);
 524
 525 /* Returns true if a variable of specified size should go on the stack.  */
 526 int gfc_can_put_var_on_stack (tree);
 527
 528 /* Allocate the lang-specific part of a decl node.  */
 529 void gfc_allocate_lang_decl (tree);
 530
 531 /* Advance along a TREE_CHAIN.  */
 532 tree gfc_advance_chain (tree, int);
 533
 534 /* Create a decl for a function.  */
 535 void gfc_create_function_decl (gfc_namespace *, bool);
 536 /* Generate the code for a function.  */
 537 void gfc_generate_function_code (gfc_namespace *);
 538 /* Output a BLOCK DATA program unit.  */
 539 void gfc_generate_block_data (gfc_namespace *);
 540 /* Output a decl for a module variable.  */
 541 void gfc_generate_module_vars (gfc_namespace *);
 542 /* Get the appropriate return statement for a procedure.  */
 543 tree gfc_generate_return (void);
 544
 545 struct GTY(()) module_htab_entry {
 546   const char *name;
 547   tree namespace_decl;
 548   htab_t GTY ((param_is (union tree_node))) decls;
 549 };
 550
 551 struct module_htab_entry *gfc_find_module (const char *);
 552 void gfc_module_add_decl (struct module_htab_entry *, tree);
 553
 554 /* Get and set the current location.  */
 555 void gfc_save_backend_locus (locus *);
 556 void gfc_set_backend_locus (locus *);
 557 void gfc_restore_backend_locus (locus *);
 558
 559 /* Handle static constructor functions.  */
 560 extern GTY(()) tree gfc_static_ctors;
 561 void gfc_generate_constructors (void);
 562
 563 /* Get the string length of an array constructor.  */
 564 bool get_array_ctor_strlen (stmtblock_t *, gfc_constructor_base, tree *);
 565
 566 /* Mark a condition as likely or unlikely.  */
 567 tree gfc_likely (tree);
 568 tree gfc_unlikely (tree);
 569
 570 /* Generate a runtime error call.  */
 571 tree gfc_trans_runtime_error (bool, locus*, const char*, ...);
 572
 573 /* Generate a runtime warning/error check.  */
 574 void gfc_trans_runtime_check (bool, bool, tree, stmtblock_t *, locus *,
 575                               const char *, ...);
 576
 577 /* Generate a runtime check for same string length.  */
 578 void gfc_trans_same_strlen_check (const char*, locus*, tree, tree,
 579                                   stmtblock_t*);
 580
 581 /* Generate a call to free() after checking that its arg is non-NULL.  */
 582 tree gfc_call_free (tree);
 583
 584 /* Allocate memory after performing a few checks.  */
 585 tree gfc_call_malloc (stmtblock_t *, tree, tree);
 586
 587 /* Build a memcpy call.  */
 588 tree gfc_build_memcpy_call (tree, tree, tree);
 589
 590 /* Allocate memory for allocatable variables, with optional status variable.  */
 591 void gfc_allocate_allocatable (stmtblock_t*, tree, tree, tree, tree,
 592                                tree, tree, tree, gfc_expr*);
 593
 594 /* Allocate memory, with optional status variable.  */
 595 void gfc_allocate_using_malloc (stmtblock_t *, tree, tree, tree);
 596
 597 /* Generate code to deallocate an array.  */
 598 tree gfc_deallocate_with_status (tree, tree, tree, tree, tree, bool,
 599                                  gfc_expr *, bool);
 600 tree gfc_deallocate_scalar_with_status (tree, tree, bool, gfc_expr*, gfc_typespec);
 601
 602 /* Generate code to call realloc().  */
 603 tree gfc_call_realloc (stmtblock_t *, tree, tree);
 604
 605 /* Generate code for an assignment, includes scalarization.  */
 606 tree gfc_trans_assignment (gfc_expr *, gfc_expr *, bool, bool);
 607
 608 /* Generate code for a pointer assignment.  */
 609 tree gfc_trans_pointer_assignment (gfc_expr *, gfc_expr *);
 610
 611 /* Initialize function decls for library functions.  */
 612 void gfc_build_intrinsic_lib_fndecls (void);
 613 /* Create function decls for IO library functions.  */
 614 void gfc_trans_io_runtime_check (tree, tree, int, const char *, stmtblock_t *);
 615 void gfc_build_io_library_fndecls (void);
 616 /* Build a function decl for a library function.  */
 617 tree gfc_build_library_function_decl (tree, tree, int, ...);
 618 tree gfc_build_library_function_decl_with_spec (tree name, const char *spec,
 619                                                 tree rettype, int nargs, ...);
 620
 621 /* Process the local variable decls of a block construct.  */
 622 void gfc_process_block_locals (gfc_namespace*);
 623
 624 /* Output initialization/clean-up code that was deferred.  */
 625 void gfc_trans_deferred_vars (gfc_symbol*, gfc_wrapped_block *);
 626
 627 /* In f95-lang.c.  */
 628 tree pushdecl (tree);
 629 tree pushdecl_top_level (tree);
 630 void pushlevel (int);
 631 tree poplevel (int, int, int);
 632 tree getdecls (void);
 633 tree gfc_truthvalue_conversion (tree);
 634 tree gfc_builtin_function (tree);
 635
 636 /* In trans-types.c.  */
 637 struct array_descr_info;
 638 bool gfc_get_array_descr_info (const_tree, struct array_descr_info *);
 639
 640 /* In trans-openmp.c */
 641 bool gfc_omp_privatize_by_reference (const_tree);
 642 enum omp_clause_default_kind gfc_omp_predetermined_sharing (tree);
 643 tree gfc_omp_report_decl (tree);
 644 tree gfc_omp_clause_default_ctor (tree, tree, tree);
 645 tree gfc_omp_clause_copy_ctor (tree, tree, tree);
 646 tree gfc_omp_clause_assign_op (tree, tree, tree);
 647 tree gfc_omp_clause_dtor (tree, tree);
 648 bool gfc_omp_disregard_value_expr (tree, bool);
 649 bool gfc_omp_private_debug_clause (tree, bool);
 650 bool gfc_omp_private_outer_ref (tree);
 651 struct gimplify_omp_ctx;
 652 void gfc_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *, tree);
 653
 654 /* Runtime library function decls.  */
 655 extern GTY(()) tree gfor_fndecl_pause_numeric;
 656 extern GTY(()) tree gfor_fndecl_pause_string;
 657 extern GTY(()) tree gfor_fndecl_stop_numeric;
 658 extern GTY(()) tree gfor_fndecl_stop_numeric_f08;
 659 extern GTY(()) tree gfor_fndecl_stop_string;
 660 extern GTY(()) tree gfor_fndecl_error_stop_numeric;
 661 extern GTY(()) tree gfor_fndecl_error_stop_string;
 662 extern GTY(()) tree gfor_fndecl_runtime_error;
 663 extern GTY(()) tree gfor_fndecl_runtime_error_at;
 664 extern GTY(()) tree gfor_fndecl_runtime_warning_at;
 665 extern GTY(()) tree gfor_fndecl_os_error;
 666 extern GTY(()) tree gfor_fndecl_generate_error;
 667 extern GTY(()) tree gfor_fndecl_set_fpe;
 668 extern GTY(()) tree gfor_fndecl_set_options;
 669 extern GTY(()) tree gfor_fndecl_ttynam;
 670 extern GTY(()) tree gfor_fndecl_ctime;
 671 extern GTY(()) tree gfor_fndecl_fdate;
 672 extern GTY(()) tree gfor_fndecl_in_pack;
 673 extern GTY(()) tree gfor_fndecl_in_unpack;
 674 extern GTY(()) tree gfor_fndecl_associated;
 675
 676
 677 /* Coarray run-time library function decls.  */
 678 extern GTY(()) tree gfor_fndecl_caf_init;
 679 extern GTY(()) tree gfor_fndecl_caf_finalize;
 680 extern GTY(()) tree gfor_fndecl_caf_register;
 681 extern GTY(()) tree gfor_fndecl_caf_deregister;
 682 extern GTY(()) tree gfor_fndecl_caf_critical;
 683 extern GTY(()) tree gfor_fndecl_caf_end_critical;
 684 extern GTY(()) tree gfor_fndecl_caf_sync_all;
 685 extern GTY(()) tree gfor_fndecl_caf_sync_images;
 686 extern GTY(()) tree gfor_fndecl_caf_error_stop;
 687 extern GTY(()) tree gfor_fndecl_caf_error_stop_str;
 688
 689 /* Coarray global variables for num_images/this_image.  */
 690 extern GTY(()) tree gfort_gvar_caf_num_images;
 691 extern GTY(()) tree gfort_gvar_caf_this_image;
 692
 693
 694 /* Math functions.  Many other math functions are handled in
 695    trans-intrinsic.c.  */
 696
 697 typedef struct GTY(()) gfc_powdecl_list {
 698   tree integer;
 699   tree real;
 700   tree cmplx;
 701 }
 702 gfc_powdecl_list;
 703
 704 extern GTY(()) gfc_powdecl_list gfor_fndecl_math_powi[4][3];
 705 extern GTY(()) tree gfor_fndecl_math_ishftc4;
 706 extern GTY(()) tree gfor_fndecl_math_ishftc8;
 707 extern GTY(()) tree gfor_fndecl_math_ishftc16;
 708
 709 /* BLAS functions.  */
 710 extern GTY(()) tree gfor_fndecl_sgemm;
 711 extern GTY(()) tree gfor_fndecl_dgemm;
 712 extern GTY(()) tree gfor_fndecl_cgemm;
 713 extern GTY(()) tree gfor_fndecl_zgemm;
 714
 715 /* String functions.  */
 716 extern GTY(()) tree gfor_fndecl_compare_string;
 717 extern GTY(()) tree gfor_fndecl_concat_string;
 718 extern GTY(()) tree gfor_fndecl_string_len_trim;
 719 extern GTY(()) tree gfor_fndecl_string_index;
 720 extern GTY(()) tree gfor_fndecl_string_scan;
 721 extern GTY(()) tree gfor_fndecl_string_verify;
 722 extern GTY(()) tree gfor_fndecl_string_trim;
 723 extern GTY(()) tree gfor_fndecl_string_minmax;
 724 extern GTY(()) tree gfor_fndecl_adjustl;
 725 extern GTY(()) tree gfor_fndecl_adjustr;
 726 extern GTY(()) tree gfor_fndecl_select_string;
 727 extern GTY(()) tree gfor_fndecl_compare_string_char4;
 728 extern GTY(()) tree gfor_fndecl_concat_string_char4;
 729 extern GTY(()) tree gfor_fndecl_string_len_trim_char4;
 730 extern GTY(()) tree gfor_fndecl_string_index_char4;
 731 extern GTY(()) tree gfor_fndecl_string_scan_char4;
 732 extern GTY(()) tree gfor_fndecl_string_verify_char4;
 733 extern GTY(()) tree gfor_fndecl_string_trim_char4;
 734 extern GTY(()) tree gfor_fndecl_string_minmax_char4;
 735 extern GTY(()) tree gfor_fndecl_adjustl_char4;
 736 extern GTY(()) tree gfor_fndecl_adjustr_char4;
 737 extern GTY(()) tree gfor_fndecl_select_string_char4;
 738
 739 /* Conversion between character kinds.  */
 740 extern GTY(()) tree gfor_fndecl_convert_char1_to_char4;
 741 extern GTY(()) tree gfor_fndecl_convert_char4_to_char1;
 742
 743 /* Other misc. runtime library functions.  */
 744 extern GTY(()) tree gfor_fndecl_size0;
 745 extern GTY(()) tree gfor_fndecl_size1;
 746 extern GTY(()) tree gfor_fndecl_iargc;
 747
 748 /* Implemented in Fortran.  */
 749 extern GTY(()) tree gfor_fndecl_sc_kind;
 750 extern GTY(()) tree gfor_fndecl_si_kind;
 751 extern GTY(()) tree gfor_fndecl_sr_kind;
 752
 753
 754 /* True if node is an integer constant.  */
 755 #define INTEGER_CST_P(node) (TREE_CODE(node) == INTEGER_CST)
 756
 757 /* gfortran-specific declaration information, the _CONT versions denote
 758    arrays with CONTIGUOUS attribute.  */
 759
 760 enum gfc_array_kind
 761 {
 762   GFC_ARRAY_UNKNOWN,
 763   GFC_ARRAY_ASSUMED_SHAPE,
 764   GFC_ARRAY_ASSUMED_SHAPE_CONT,
 765   GFC_ARRAY_ALLOCATABLE,
 766   GFC_ARRAY_POINTER,
 767   GFC_ARRAY_POINTER_CONT
 768 };
 769
 770 /* Array types only.  */
 771 /* FIXME: the variable_size annotation here is needed because these types are
 772    variable-sized in some other frontends.  Due to gengtype deficiency the GTY
 773    options of such types have to agree across all frontends. */
 774 struct GTY((variable_size))     lang_type        {
 775   int rank, corank;
 776   enum gfc_array_kind akind;
 777   tree lbound[GFC_MAX_DIMENSIONS];
 778   tree ubound[GFC_MAX_DIMENSIONS];
 779   tree stride[GFC_MAX_DIMENSIONS];
 780   tree size;
 781   tree offset;
 782   tree dtype;
 783   tree dataptr_type;
 784   tree span;
 785   tree base_decl[2];
 786   tree nonrestricted_type;
 787   tree caf_token;
 788   tree caf_offset;
 789 };
 790
 791 struct GTY((variable_size)) lang_decl {
 792   /* Dummy variables.  */
 793   tree saved_descriptor;
 794   /* Assigned integer nodes.  Stringlength is the IO format string's length.
 795      Addr is the address of the string or the target label. Stringlength is
 796      initialized to -2 and assigned to -1 when addr is assigned to the
 797      address of target label.  */
 798   tree stringlen;
 799   tree addr;
 800   tree span;
 801   /* For assumed-shape coarrays.  */
 802   tree token, caf_offset;
 803 };
 804
 805
 806 #define GFC_DECL_ASSIGN_ADDR(node) DECL_LANG_SPECIFIC(node)->addr
 807 #define GFC_DECL_STRING_LEN(node) DECL_LANG_SPECIFIC(node)->stringlen
 808 #define GFC_DECL_SPAN(node) DECL_LANG_SPECIFIC(node)->span
 809 #define GFC_DECL_TOKEN(node) DECL_LANG_SPECIFIC(node)->token
 810 #define GFC_DECL_CAF_OFFSET(node) DECL_LANG_SPECIFIC(node)->caf_offset
 811 #define GFC_DECL_SAVED_DESCRIPTOR(node) \
 812   (DECL_LANG_SPECIFIC(node)->saved_descriptor)
 813 #define GFC_DECL_PACKED_ARRAY(node) DECL_LANG_FLAG_0(node)
 814 #define GFC_DECL_PARTIAL_PACKED_ARRAY(node) DECL_LANG_FLAG_1(node)
 815 #define GFC_DECL_ASSIGN(node) DECL_LANG_FLAG_2(node)
 816 #define GFC_DECL_COMMON_OR_EQUIV(node) DECL_LANG_FLAG_3(node)
 817 #define GFC_DECL_CRAY_POINTEE(node) DECL_LANG_FLAG_4(node)
 818 #define GFC_DECL_RESULT(node) DECL_LANG_FLAG_5(node)
 819 #define GFC_DECL_SUBREF_ARRAY_P(node) DECL_LANG_FLAG_6(node)
 820 #define GFC_DECL_PUSH_TOPLEVEL(node) DECL_LANG_FLAG_7(node)
 821 #define GFC_DECL_CLASS(node) DECL_LANG_FLAG_8(node)
 822
 823 /* An array descriptor.  */
 824 #define GFC_DESCRIPTOR_TYPE_P(node) TYPE_LANG_FLAG_1(node)
 825 /* An array without a descriptor.  */
 826 #define GFC_ARRAY_TYPE_P(node) TYPE_LANG_FLAG_2(node)
 827 /* Fortran POINTER type.  */
 828 #define GFC_POINTER_TYPE_P(node) TYPE_LANG_FLAG_3(node)
 829 /* The GFC_TYPE_ARRAY_* members are present in both descriptor and
 830    descriptorless array types.  */
 831 #define GFC_TYPE_ARRAY_LBOUND(node, dim) \
 832   (TYPE_LANG_SPECIFIC(node)->lbound[dim])
 833 #define GFC_TYPE_ARRAY_UBOUND(node, dim) \
 834   (TYPE_LANG_SPECIFIC(node)->ubound[dim])
 835 #define GFC_TYPE_ARRAY_STRIDE(node, dim) \
 836   (TYPE_LANG_SPECIFIC(node)->stride[dim])
 837 #define GFC_TYPE_ARRAY_RANK(node) (TYPE_LANG_SPECIFIC(node)->rank)
 838 #define GFC_TYPE_ARRAY_CORANK(node) (TYPE_LANG_SPECIFIC(node)->corank)
 839 #define GFC_TYPE_ARRAY_CAF_TOKEN(node) (TYPE_LANG_SPECIFIC(node)->caf_token)
 840 #define GFC_TYPE_ARRAY_CAF_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->caf_offset)
 841 #define GFC_TYPE_ARRAY_SIZE(node) (TYPE_LANG_SPECIFIC(node)->size)
 842 #define GFC_TYPE_ARRAY_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->offset)
 843 #define GFC_TYPE_ARRAY_AKIND(node) (TYPE_LANG_SPECIFIC(node)->akind)
 844 /* Code should use gfc_get_dtype instead of accessing this directly.  It may
 845    not be known when the type is created.  */
 846 #define GFC_TYPE_ARRAY_DTYPE(node) (TYPE_LANG_SPECIFIC(node)->dtype)
 847 #define GFC_TYPE_ARRAY_DATAPTR_TYPE(node) \
 848   (TYPE_LANG_SPECIFIC(node)->dataptr_type)
 849 #define GFC_TYPE_ARRAY_SPAN(node) (TYPE_LANG_SPECIFIC(node)->span)
 850 #define GFC_TYPE_ARRAY_BASE_DECL(node, internal) \
 851   (TYPE_LANG_SPECIFIC(node)->base_decl[(internal)])
 852
 853
 854 /* Build an expression with void type.  */
 855 #define build1_v(code, arg) \
 856         fold_build1_loc (input_location, code, void_type_node, arg)
 857 #define build2_v(code, arg1, arg2) \
 858         fold_build2_loc (input_location, code, void_type_node, arg1, arg2)
 859 #define build3_v(code, arg1, arg2, arg3) \
 860         fold_build3_loc (input_location, code, void_type_node, arg1, arg2, arg3)
 861 #define build4_v(code, arg1, arg2, arg3, arg4) \
 862         build4_loc (input_location, code, void_type_node, arg1, arg2, \
 863                     arg3, arg4)
 864
 865 /* This group of functions allows a caller to evaluate an expression from
 866    the callee's interface.  It establishes a mapping between the interface's
 867    dummy arguments and the caller's actual arguments, then applies that
 868    mapping to a given gfc_expr.
 869
 870    You can initialize a mapping structure like so:
 871
 872        gfc_interface_mapping mapping;
 873        ...
 874        gfc_init_interface_mapping (&mapping);
 875
 876    You should then evaluate each actual argument into a temporary
 877    gfc_se structure, here called "se", and map the result to the
 878    dummy argument's symbol, here called "sym":
 879
 880        gfc_add_interface_mapping (&mapping, sym, &se);
 881
 882    After adding all mappings, you should call:
 883
 884        gfc_finish_interface_mapping (&mapping, pre, post);
 885
 886    where "pre" and "post" are statement blocks for initialization
 887    and finalization code respectively.  You can then evaluate an
 888    interface expression "expr" as follows:
 889
 890        gfc_apply_interface_mapping (&mapping, se, expr);
 891
 892    Once you've evaluated all expressions, you should free
 893    the mapping structure with:
 894
 895        gfc_free_interface_mapping (&mapping); */
 896
 897
 898 /* This structure represents a mapping from OLD to NEW, where OLD is a
 899    dummy argument symbol and NEW is a symbol that represents the value
 900    of an actual argument.  Mappings are linked together using NEXT
 901    (in no particular order).  */
 902 typedef struct gfc_interface_sym_mapping
 903 {
 904   struct gfc_interface_sym_mapping *next;
 905   gfc_symbol *old;
 906   gfc_symtree *new_sym;
 907   gfc_expr *expr;
 908 }
 909 gfc_interface_sym_mapping;
 910
 911
 912 /* This structure is used by callers to evaluate an expression from
 913    a callee's interface.  */
 914 typedef struct gfc_interface_mapping
 915 {
 916   /* Maps the interface's dummy arguments to the values that the caller
 917      is passing.  The whole list is owned by this gfc_interface_mapping.  */
 918   gfc_interface_sym_mapping *syms;
 919
 920   /* A list of gfc_charlens that were needed when creating copies of
 921      expressions.  The whole list is owned by this gfc_interface_mapping.  */
 922   gfc_charlen *charlens;
 923 }
 924 gfc_interface_mapping;
 925
 926 void gfc_init_interface_mapping (gfc_interface_mapping *);
 927 void gfc_free_interface_mapping (gfc_interface_mapping *);
 928 void gfc_add_interface_mapping (gfc_interface_mapping *,
 929                                 gfc_symbol *, gfc_se *, gfc_expr *);
 930 void gfc_finish_interface_mapping (gfc_interface_mapping *,
 931                                    stmtblock_t *, stmtblock_t *);
 932 void gfc_apply_interface_mapping (gfc_interface_mapping *,
 933                                   gfc_se *, gfc_expr *);
 934
 935
 936 /* Standard error messages used in all the trans-*.c files.  */
 937 extern const char gfc_msg_fault[];
 938 extern const char gfc_msg_wrong_return[];
 939
 940 #define OMPWS_WORKSHARE_FLAG    1       /* Set if in a workshare construct.  */
 941 #define OMPWS_CURR_SINGLEUNIT   2       /* Set if current gfc_code in workshare
 942                                            construct is not workshared.  */
 943 #define OMPWS_SCALARIZER_WS     4       /* Set if scalarizer should attempt
 944                                            to create parallel loops.  */
 945 #define OMPWS_NOWAIT            8       /* Use NOWAIT on OMP_FOR.  */
 946 extern int ompws_flags;
 947
 948 #endif /* GFC_TRANS_H */