gcc/fortran/trans.h

   1 /* Header for code translation functions
   2    Copyright (C) 2002-2013 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 /* Mangled symbols take the form __module__name.  */
  25 #define GFC_MAX_MANGLED_SYMBOL_LEN  (GFC_MAX_SYMBOL_LEN*2+4)
  26
  27 /* Struct for holding a block of statements.  It should be treated as an
  28    opaque entity and not modified directly.  This allows us to change the
  29    underlying representation of statement lists.  */
  30 typedef struct
  31 {
  32   tree head;
  33   unsigned int has_scope:1;
  34 }
  35 stmtblock_t;
  36
  37 /* a simplified expression */
  38 typedef struct gfc_se
  39 {
  40   /* Code blocks to be executed before and after using the value.  */
  41   stmtblock_t pre;
  42   stmtblock_t post;
  43
  44   /* the result of the expression */
  45   tree expr;
  46
  47   /* The length of a character string value.  */
  48   tree string_length;
  49
  50   /* If set gfc_conv_variable will return an expression for the array
  51      descriptor. When set, want_pointer should also be set.
  52      If not set scalarizing variables will be substituted.  */
  53   unsigned descriptor_only:1;
  54
  55   /* When this is set gfc_conv_expr returns the address of a variable.  Only
  56      applies to EXPR_VARIABLE nodes.
  57      Also used by gfc_conv_array_parameter. When set this indicates a pointer
  58      to the descriptor should be returned, rather than the descriptor itself.
  59    */
  60   unsigned want_pointer:1;
  61
  62   /* An array function call returning without a temporary.  Also used for array
  63      pointer assignments.  */
  64   unsigned direct_byref:1;
  65
  66   /* If direct_byref is set, do work out the descriptor as in that case but
  67      do still create a new descriptor variable instead of using an
  68      existing one.  This is useful for special pointer assignments like
  69      rank remapping where we have to process the descriptor before
  70      assigning to final one.  */
  71   unsigned byref_noassign:1;
  72
  73   /* Ignore absent optional arguments.  Used for some intrinsics.  */
  74   unsigned ignore_optional:1;
  75
  76   /* When this is set the data and offset fields of the returned descriptor
  77      are NULL.  Used by intrinsic size.  */
  78   unsigned data_not_needed:1;
  79
  80   /* If set, gfc_conv_procedure_call does not put byref calls into se->pre.  */
  81   unsigned no_function_call:1;
  82
  83   /* If set, we will force the creation of a temporary. Useful to disable
  84      non-copying procedure argument passing optimizations, when some function
  85      args alias.  */
  86   unsigned force_tmp:1;
  87
  88   unsigned want_coarray:1;
  89
  90   /* Scalarization parameters.  */
  91   struct gfc_se *parent;
  92   struct gfc_ss *ss;
  93   struct gfc_loopinfo *loop;
  94 }
  95 gfc_se;
  96
  97
  98 /* Denotes different types of coarray.
  99    Please keep in sync with libgfortran/caf/libcaf.h.  */
 100 typedef enum
 101 {
 102   GFC_CAF_COARRAY_STATIC,
 103   GFC_CAF_COARRAY_ALLOC,
 104   GFC_CAF_LOCK,
 105   GFC_CAF_LOCK_COMP
 106 }
 107 gfc_coarray_type;
 108
 109
 110 /* The array-specific scalarization information.  The array members of
 111    this struct are indexed by actual array index, and thus can be sparse.  */
 112
 113 typedef struct gfc_array_info
 114 {
 115   mpz_t *shape;
 116
 117   /* The ref that holds information on this section.  */
 118   gfc_ref *ref;
 119   /* The descriptor of this array.  */
 120   tree descriptor;
 121   /* holds the pointer to the data array.  */
 122   tree data;
 123   /* To move some of the array index calculation out of the innermost loop.  */
 124   tree offset;
 125   tree saved_offset;
 126   tree stride0;
 127   /* Holds the SS for a subscript.  Indexed by actual dimension.  */
 128   struct gfc_ss *subscript[GFC_MAX_DIMENSIONS];
 129
 130   /* stride and delta are used to access this inside a scalarization loop.
 131      start is used in the calculation of these.  Indexed by scalarizer
 132      dimension.  */
 133   tree start[GFC_MAX_DIMENSIONS];
 134   tree end[GFC_MAX_DIMENSIONS];
 135   tree stride[GFC_MAX_DIMENSIONS];
 136   tree delta[GFC_MAX_DIMENSIONS];
 137 }
 138 gfc_array_info;
 139
 140 typedef enum
 141 {
 142   /* A scalar value.  This will be evaluated before entering the
 143      scalarization loop.  */
 144   GFC_SS_SCALAR,
 145
 146   /* Like GFC_SS_SCALAR it evaluates the expression outside the
 147      loop.  Is always evaluated as a reference to the temporary, unless
 148      temporary evaluation can result in a NULL pointer dereferencing (case of
 149      optional arguments).  Used for elemental function arguments.  */
 150   GFC_SS_REFERENCE,
 151
 152   /* An array section.  Scalarization indices will be substituted during
 153      expression translation.  */
 154   GFC_SS_SECTION,
 155
 156   /* A non-elemental function call returning an array.  The call is executed
 157      before entering the scalarization loop, storing the result in a
 158      temporary.  This temporary is then used inside the scalarization loop.
 159      Simple assignments, e.g. a(:) = fn(), are handled without a temporary
 160      as a special case.  */
 161   GFC_SS_FUNCTION,
 162
 163   /* An array constructor.  The current implementation is sub-optimal in
 164      many cases.  It allocated a temporary, assigns the values to it, then
 165      uses this temporary inside the scalarization loop.  */
 166   GFC_SS_CONSTRUCTOR,
 167
 168   /* A vector subscript.  The vector's descriptor is cached in the
 169      "descriptor" field of the associated gfc_ss_info.  */
 170   GFC_SS_VECTOR,
 171
 172   /* A temporary array allocated by the scalarizer.  Its rank can be less
 173      than that of the assignment expression.  */
 174   GFC_SS_TEMP,
 175
 176   /* An intrinsic function call.  Many intrinsic functions which map directly
 177      to library calls are created as GFC_SS_FUNCTION nodes.  */
 178   GFC_SS_INTRINSIC,
 179
 180   /* A component of a derived type.  */
 181   GFC_SS_COMPONENT
 182 }
 183 gfc_ss_type;
 184
 185
 186 typedef struct gfc_ss_info
 187 {
 188   int refcount;
 189   gfc_ss_type type;
 190   gfc_expr *expr;
 191   tree string_length;
 192
 193   union
 194   {
 195     /* If type is GFC_SS_SCALAR or GFC_SS_REFERENCE.  */
 196     struct
 197     {
 198       tree value;
 199     }
 200     scalar;
 201
 202     /* GFC_SS_TEMP.  */
 203     struct
 204     {
 205       tree type;
 206     }
 207     temp;
 208
 209     /* All other types.  */
 210     gfc_array_info array;
 211   }
 212   data;
 213
 214   /* This is used by assignments requiring temporaries.  The bits specify which
 215      loops the terms appear in.  This will be 1 for the RHS expressions,
 216      2 for the LHS expressions, and 3(=1|2) for the temporary.  */
 217   unsigned useflags:2;
 218
 219   /* Suppresses precalculation of scalars in WHERE assignments.  */
 220   unsigned where:1;
 221
 222   /* Tells whether the SS is for an actual argument which can be a NULL
 223      reference.  In other words, the associated dummy argument is OPTIONAL.
 224      Used to handle elemental procedures.  */
 225   bool can_be_null_ref;
 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 void gfc_reset_vptr (stmtblock_t *, gfc_expr *);
 345 tree gfc_class_set_static_fields (tree, tree, tree);
 346 tree gfc_vtable_hash_get (tree);
 347 tree gfc_vtable_size_get (tree);
 348 tree gfc_vtable_extends_get (tree);
 349 tree gfc_vtable_def_init_get (tree);
 350 tree gfc_vtable_copy_get (tree);
 351 tree gfc_vtable_final_get (tree);
 352 tree gfc_get_vptr_from_expr (tree);
 353 tree gfc_get_class_array_ref (tree, tree);
 354 tree gfc_copy_class_to_class (tree, tree, tree);
 355 tree gfc_build_final_call (gfc_typespec, gfc_expr *, gfc_expr *, bool,
 356                            gfc_expr *);
 357 void gfc_conv_derived_to_class (gfc_se *, gfc_expr *, gfc_typespec, tree, bool,
 358                                 bool);
 359 void gfc_conv_class_to_class (gfc_se *, gfc_expr *, gfc_typespec, bool, bool,
 360                               bool, bool);
 361
 362 /* Initialize an init/cleanup block.  */
 363 void gfc_start_wrapped_block (gfc_wrapped_block* block, tree code);
 364 /* Add a pair of init/cleanup code to the block.  Each one might be a
 365    NULL_TREE if not required.  */
 366 void gfc_add_init_cleanup (gfc_wrapped_block* block, tree init, tree cleanup);
 367 /* Finalize the block, that is, create a single expression encapsulating the
 368    original code together with init and clean-up code.  */
 369 tree gfc_finish_wrapped_block (gfc_wrapped_block* block);
 370
 371
 372 /* Advance the SS chain to the next term.  */
 373 void gfc_advance_se_ss_chain (gfc_se *);
 374
 375 /* Call this to initialize a gfc_se structure before use
 376    first parameter is structure to initialize, second is
 377    parent to get scalarization data from, or NULL.  */
 378 void gfc_init_se (gfc_se *, gfc_se *);
 379
 380 /* Create an artificial variable decl and add it to the current scope.  */
 381 tree gfc_create_var (tree, const char *);
 382 /* Like above but doesn't add it to the current scope.  */
 383 tree gfc_create_var_np (tree, const char *);
 384
 385 /* Store the result of an expression in a temp variable so it can be used
 386    repeatedly even if the original changes */
 387 void gfc_make_safe_expr (gfc_se * se);
 388
 389 /* Makes sure se is suitable for passing as a function string parameter.  */
 390 void gfc_conv_string_parameter (gfc_se * se);
 391
 392 /* Compare two strings.  */
 393 tree gfc_build_compare_string (tree, tree, tree, tree, int, enum tree_code);
 394
 395 /* When using the gfc_conv_* make sure you understand what they do, i.e.
 396    when a POST chain may be created, and what the returned expression may be
 397    used for.  Note that character strings have special handling.  This
 398    should not be a problem as most statements/operations only deal with
 399    numeric/logical types.  See the implementations in trans-expr.c
 400    for details of the individual functions.  */
 401
 402 void gfc_conv_expr (gfc_se * se, gfc_expr * expr);
 403 void gfc_conv_expr_val (gfc_se * se, gfc_expr * expr);
 404 void gfc_conv_expr_lhs (gfc_se * se, gfc_expr * expr);
 405 void gfc_conv_expr_reference (gfc_se * se, gfc_expr *);
 406 void gfc_conv_expr_type (gfc_se * se, gfc_expr *, tree);
 407
 408 tree gfc_conv_scalar_to_descriptor (gfc_se *, tree, symbol_attribute);
 409
 410
 411 /* trans-expr.c */
 412 void gfc_conv_scalar_char_value (gfc_symbol *sym, gfc_se *se, gfc_expr **expr);
 413 tree gfc_string_to_single_character (tree len, tree str, int kind);
 414
 415 /* Find the decl containing the auxiliary variables for assigned variables.  */
 416 void gfc_conv_label_variable (gfc_se * se, gfc_expr * expr);
 417 /* If the value is not constant, Create a temporary and copy the value.  */
 418 tree gfc_evaluate_now_loc (location_t, tree, stmtblock_t *);
 419 tree gfc_evaluate_now (tree, stmtblock_t *);
 420
 421 /* Find the appropriate variant of a math intrinsic.  */
 422 tree gfc_builtin_decl_for_float_kind (enum built_in_function, int);
 423
 424 /* Intrinsic procedure handling.  */
 425 tree gfc_conv_intrinsic_subroutine (gfc_code *);
 426 void gfc_conv_intrinsic_function (gfc_se *, gfc_expr *);
 427
 428 /* Does an intrinsic map directly to an external library call
 429    This is true for array-returning intrinsics, unless
 430    gfc_inline_intrinsic_function_p returns true.  */
 431 int gfc_is_intrinsic_libcall (gfc_expr *);
 432
 433 /* Used to call ordinary functions/subroutines
 434    and procedure pointer components.  */
 435 int gfc_conv_procedure_call (gfc_se *, gfc_symbol *, gfc_actual_arglist *,
 436                              gfc_expr *, vec<tree, va_gc> *);
 437
 438 void gfc_conv_subref_array_arg (gfc_se *, gfc_expr *, int, sym_intent, bool);
 439
 440 /* Generate code for a scalar assignment.  */
 441 tree gfc_trans_scalar_assign (gfc_se *, gfc_se *, gfc_typespec, bool, bool,
 442                               bool);
 443
 444 /* Translate COMMON blocks.  */
 445 void gfc_trans_common (gfc_namespace *);
 446
 447 /* Translate a derived type constructor.  */
 448 void gfc_conv_structure (gfc_se *, gfc_expr *, int);
 449
 450 /* Return an expression which determines if a dummy parameter is present.  */
 451 tree gfc_conv_expr_present (gfc_symbol *);
 452 /* Convert a missing, dummy argument into a null or zero.  */
 453 void gfc_conv_missing_dummy (gfc_se *, gfc_expr *, gfc_typespec, int);
 454
 455 /* Generate code to allocate a string temporary.  */
 456 tree gfc_conv_string_tmp (gfc_se *, tree, tree);
 457 /* Get the string length variable belonging to an expression.  */
 458 tree gfc_get_expr_charlen (gfc_expr *);
 459 /* Initialize a string length variable.  */
 460 void gfc_conv_string_length (gfc_charlen *, gfc_expr *, stmtblock_t *);
 461 /* Ensure type sizes can be gimplified.  */
 462 void gfc_trans_vla_type_sizes (gfc_symbol *, stmtblock_t *);
 463
 464 /* Add an expression to the end of a block.  */
 465 void gfc_add_expr_to_block (stmtblock_t *, tree);
 466 /* Add an expression to the beginning of a block.  */
 467 void gfc_prepend_expr_to_block (stmtblock_t *, tree);
 468 /* Add a block to the end of a block.  */
 469 void gfc_add_block_to_block (stmtblock_t *, stmtblock_t *);
 470 /* Add a MODIFY_EXPR to a block.  */
 471 void gfc_add_modify_loc (location_t, stmtblock_t *, tree, tree);
 472 void gfc_add_modify (stmtblock_t *, tree, tree);
 473
 474 /* Initialize a statement block.  */
 475 void gfc_init_block (stmtblock_t *);
 476 /* Start a new statement block.  Like gfc_init_block but also starts a new
 477    variable scope.  */
 478 void gfc_start_block (stmtblock_t *);
 479 /* Finish a statement block.  Also closes the scope if the block was created
 480    with gfc_start_block.  */
 481 tree gfc_finish_block (stmtblock_t *);
 482 /* Merge the scope of a block with its parent.  */
 483 void gfc_merge_block_scope (stmtblock_t * block);
 484
 485 /* Return the backend label decl.  */
 486 tree gfc_get_label_decl (gfc_st_label *);
 487
 488 /* Return the decl for an external function.  */
 489 tree gfc_get_extern_function_decl (gfc_symbol *);
 490
 491 /* Return the decl for a function.  */
 492 tree gfc_get_function_decl (gfc_symbol *);
 493
 494 /* Build an ADDR_EXPR.  */
 495 tree gfc_build_addr_expr (tree, tree);
 496
 497 /* Build an ARRAY_REF.  */
 498 tree gfc_build_array_ref (tree, tree, tree);
 499
 500 /* Creates a label.  Decl is artificial if label_id == NULL_TREE.  */
 501 tree gfc_build_label_decl (tree);
 502
 503 /* Return the decl used to hold the function return value.
 504    Do not use if the function has an explicit result variable.  */
 505 tree gfc_get_fake_result_decl (gfc_symbol *, int);
 506
 507 /* Add a decl to the binding level for the current function.  */
 508 void gfc_add_decl_to_function (tree);
 509
 510 /* Make prototypes for runtime library functions.  */
 511 void gfc_build_builtin_function_decls (void);
 512
 513 /* Set the backend source location of a decl.  */
 514 void gfc_set_decl_location (tree, locus *);
 515
 516 /* Get a module symbol backend_decl if possible.  */
 517 bool gfc_get_module_backend_decl (gfc_symbol *);
 518
 519 /* Return the variable decl for a symbol.  */
 520 tree gfc_get_symbol_decl (gfc_symbol *);
 521
 522 /* Build a static initializer.  */
 523 tree gfc_conv_initializer (gfc_expr *, gfc_typespec *, tree, bool, bool, bool);
 524
 525 /* Assign a default initializer to a derived type.  */
 526 void gfc_init_default_dt (gfc_symbol *, stmtblock_t *, bool);
 527
 528 /* Substitute a temporary variable in place of the real one.  */
 529 void gfc_shadow_sym (gfc_symbol *, tree, gfc_saved_var *);
 530
 531 /* Restore the original variable.  */
 532 void gfc_restore_sym (gfc_symbol *, gfc_saved_var *);
 533
 534 /* Setting a decl assembler name, mangling it according to target rules
 535    (like Windows @NN decorations).  */
 536 void gfc_set_decl_assembler_name (tree, tree);
 537
 538 /* Returns true if a variable of specified size should go on the stack.  */
 539 int gfc_can_put_var_on_stack (tree);
 540
 541 /* Allocate the lang-specific part of a decl node.  */
 542 void gfc_allocate_lang_decl (tree);
 543
 544 /* Advance along a TREE_CHAIN.  */
 545 tree gfc_advance_chain (tree, int);
 546
 547 /* Create a decl for a function.  */
 548 void gfc_create_function_decl (gfc_namespace *, bool);
 549 /* Generate the code for a function.  */
 550 void gfc_generate_function_code (gfc_namespace *);
 551 /* Output a BLOCK DATA program unit.  */
 552 void gfc_generate_block_data (gfc_namespace *);
 553 /* Output a decl for a module variable.  */
 554 void gfc_generate_module_vars (gfc_namespace *);
 555 /* Get the appropriate return statement for a procedure.  */
 556 tree gfc_generate_return (void);
 557
 558 struct GTY(()) module_htab_entry {
 559   const char *name;
 560   tree namespace_decl;
 561   htab_t GTY ((param_is (union tree_node))) decls;
 562 };
 563
 564 struct module_htab_entry *gfc_find_module (const char *);
 565 void gfc_module_add_decl (struct module_htab_entry *, tree);
 566
 567 /* Get and set the current location.  */
 568 void gfc_save_backend_locus (locus *);
 569 void gfc_set_backend_locus (locus *);
 570 void gfc_restore_backend_locus (locus *);
 571
 572 /* Handle static constructor functions.  */
 573 extern GTY(()) tree gfc_static_ctors;
 574 void gfc_generate_constructors (void);
 575
 576 /* Get the string length of an array constructor.  */
 577 bool get_array_ctor_strlen (stmtblock_t *, gfc_constructor_base, tree *);
 578
 579 /* Mark a condition as likely or unlikely.  */
 580 tree gfc_likely (tree);
 581 tree gfc_unlikely (tree);
 582
 583 /* Generate a runtime error call.  */
 584 tree gfc_trans_runtime_error (bool, locus*, const char*, ...);
 585
 586 /* Generate a runtime warning/error check.  */
 587 void gfc_trans_runtime_check (bool, bool, tree, stmtblock_t *, locus *,
 588                               const char *, ...);
 589
 590 /* Generate a runtime check for same string length.  */
 591 void gfc_trans_same_strlen_check (const char*, locus*, tree, tree,
 592                                   stmtblock_t*);
 593
 594 /* Generate a call to free() after checking that its arg is non-NULL.  */
 595 tree gfc_call_free (tree);
 596
 597 /* Allocate memory after performing a few checks.  */
 598 tree gfc_call_malloc (stmtblock_t *, tree, tree);
 599
 600 /* Build a memcpy call.  */
 601 tree gfc_build_memcpy_call (tree, tree, tree);
 602
 603 /* Allocate memory for allocatable variables, with optional status variable.  */
 604 void gfc_allocate_allocatable (stmtblock_t*, tree, tree, tree, tree,
 605                                tree, tree, tree, gfc_expr*);
 606
 607 /* Allocate memory, with optional status variable.  */
 608 void gfc_allocate_using_malloc (stmtblock_t *, tree, tree, tree);
 609
 610 /* Generate code to deallocate an array.  */
 611 tree gfc_deallocate_with_status (tree, tree, tree, tree, tree, bool,
 612                                  gfc_expr *, bool);
 613 tree gfc_deallocate_scalar_with_status (tree, tree, bool, gfc_expr*, gfc_typespec);
 614
 615 /* Generate code to call realloc().  */
 616 tree gfc_call_realloc (stmtblock_t *, tree, tree);
 617
 618 /* Generate code for an assignment, includes scalarization.  */
 619 tree gfc_trans_assignment (gfc_expr *, gfc_expr *, bool, bool);
 620
 621 /* Generate code for a pointer assignment.  */
 622 tree gfc_trans_pointer_assignment (gfc_expr *, gfc_expr *);
 623
 624 /* Initialize function decls for library functions.  */
 625 void gfc_build_intrinsic_lib_fndecls (void);
 626 /* Create function decls for IO library functions.  */
 627 void gfc_trans_io_runtime_check (tree, tree, int, const char *, stmtblock_t *);
 628 void gfc_build_io_library_fndecls (void);
 629 /* Build a function decl for a library function.  */
 630 tree gfc_build_library_function_decl (tree, tree, int, ...);
 631 tree gfc_build_library_function_decl_with_spec (tree name, const char *spec,
 632                                                 tree rettype, int nargs, ...);
 633
 634 /* Process the local variable decls of a block construct.  */
 635 void gfc_process_block_locals (gfc_namespace*);
 636
 637 /* Output initialization/clean-up code that was deferred.  */
 638 void gfc_trans_deferred_vars (gfc_symbol*, gfc_wrapped_block *);
 639
 640 /* In f95-lang.c.  */
 641 tree pushdecl (tree);
 642 tree pushdecl_top_level (tree);
 643 void pushlevel (void);
 644 tree poplevel (int, int);
 645 tree getdecls (void);
 646
 647 /* In trans-types.c.  */
 648 struct array_descr_info;
 649 bool gfc_get_array_descr_info (const_tree, struct array_descr_info *);
 650
 651 /* In trans-openmp.c */
 652 bool gfc_omp_privatize_by_reference (const_tree);
 653 enum omp_clause_default_kind gfc_omp_predetermined_sharing (tree);
 654 tree gfc_omp_report_decl (tree);
 655 tree gfc_omp_clause_default_ctor (tree, tree, tree);
 656 tree gfc_omp_clause_copy_ctor (tree, tree, tree);
 657 tree gfc_omp_clause_assign_op (tree, tree, tree);
 658 tree gfc_omp_clause_dtor (tree, tree);
 659 bool gfc_omp_disregard_value_expr (tree, bool);
 660 bool gfc_omp_private_debug_clause (tree, bool);
 661 bool gfc_omp_private_outer_ref (tree);
 662 struct gimplify_omp_ctx;
 663 void gfc_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *, tree);
 664
 665 /* Runtime library function decls.  */
 666 extern GTY(()) tree gfor_fndecl_pause_numeric;
 667 extern GTY(()) tree gfor_fndecl_pause_string;
 668 extern GTY(()) tree gfor_fndecl_stop_numeric;
 669 extern GTY(()) tree gfor_fndecl_stop_numeric_f08;
 670 extern GTY(()) tree gfor_fndecl_stop_string;
 671 extern GTY(()) tree gfor_fndecl_error_stop_numeric;
 672 extern GTY(()) tree gfor_fndecl_error_stop_string;
 673 extern GTY(()) tree gfor_fndecl_runtime_error;
 674 extern GTY(()) tree gfor_fndecl_runtime_error_at;
 675 extern GTY(()) tree gfor_fndecl_runtime_warning_at;
 676 extern GTY(()) tree gfor_fndecl_os_error;
 677 extern GTY(()) tree gfor_fndecl_generate_error;
 678 extern GTY(()) tree gfor_fndecl_set_fpe;
 679 extern GTY(()) tree gfor_fndecl_set_options;
 680 extern GTY(()) tree gfor_fndecl_ttynam;
 681 extern GTY(()) tree gfor_fndecl_ctime;
 682 extern GTY(()) tree gfor_fndecl_fdate;
 683 extern GTY(()) tree gfor_fndecl_in_pack;
 684 extern GTY(()) tree gfor_fndecl_in_unpack;
 685 extern GTY(()) tree gfor_fndecl_associated;
 686
 687
 688 /* Coarray run-time library function decls.  */
 689 extern GTY(()) tree gfor_fndecl_caf_init;
 690 extern GTY(()) tree gfor_fndecl_caf_finalize;
 691 extern GTY(()) tree gfor_fndecl_caf_register;
 692 extern GTY(()) tree gfor_fndecl_caf_deregister;
 693 extern GTY(()) tree gfor_fndecl_caf_critical;
 694 extern GTY(()) tree gfor_fndecl_caf_end_critical;
 695 extern GTY(()) tree gfor_fndecl_caf_sync_all;
 696 extern GTY(()) tree gfor_fndecl_caf_sync_images;
 697 extern GTY(()) tree gfor_fndecl_caf_error_stop;
 698 extern GTY(()) tree gfor_fndecl_caf_error_stop_str;
 699
 700 /* Coarray global variables for num_images/this_image.  */
 701 extern GTY(()) tree gfort_gvar_caf_num_images;
 702 extern GTY(()) tree gfort_gvar_caf_this_image;
 703
 704
 705 /* Math functions.  Many other math functions are handled in
 706    trans-intrinsic.c.  */
 707
 708 typedef struct GTY(()) gfc_powdecl_list {
 709   tree integer;
 710   tree real;
 711   tree cmplx;
 712 }
 713 gfc_powdecl_list;
 714
 715 extern GTY(()) gfc_powdecl_list gfor_fndecl_math_powi[4][3];
 716 extern GTY(()) tree gfor_fndecl_math_ishftc4;
 717 extern GTY(()) tree gfor_fndecl_math_ishftc8;
 718 extern GTY(()) tree gfor_fndecl_math_ishftc16;
 719
 720 /* BLAS functions.  */
 721 extern GTY(()) tree gfor_fndecl_sgemm;
 722 extern GTY(()) tree gfor_fndecl_dgemm;
 723 extern GTY(()) tree gfor_fndecl_cgemm;
 724 extern GTY(()) tree gfor_fndecl_zgemm;
 725
 726 /* String functions.  */
 727 extern GTY(()) tree gfor_fndecl_compare_string;
 728 extern GTY(()) tree gfor_fndecl_concat_string;
 729 extern GTY(()) tree gfor_fndecl_string_len_trim;
 730 extern GTY(()) tree gfor_fndecl_string_index;
 731 extern GTY(()) tree gfor_fndecl_string_scan;
 732 extern GTY(()) tree gfor_fndecl_string_verify;
 733 extern GTY(()) tree gfor_fndecl_string_trim;
 734 extern GTY(()) tree gfor_fndecl_string_minmax;
 735 extern GTY(()) tree gfor_fndecl_adjustl;
 736 extern GTY(()) tree gfor_fndecl_adjustr;
 737 extern GTY(()) tree gfor_fndecl_select_string;
 738 extern GTY(()) tree gfor_fndecl_compare_string_char4;
 739 extern GTY(()) tree gfor_fndecl_concat_string_char4;
 740 extern GTY(()) tree gfor_fndecl_string_len_trim_char4;
 741 extern GTY(()) tree gfor_fndecl_string_index_char4;
 742 extern GTY(()) tree gfor_fndecl_string_scan_char4;
 743 extern GTY(()) tree gfor_fndecl_string_verify_char4;
 744 extern GTY(()) tree gfor_fndecl_string_trim_char4;
 745 extern GTY(()) tree gfor_fndecl_string_minmax_char4;
 746 extern GTY(()) tree gfor_fndecl_adjustl_char4;
 747 extern GTY(()) tree gfor_fndecl_adjustr_char4;
 748 extern GTY(()) tree gfor_fndecl_select_string_char4;
 749
 750 /* Conversion between character kinds.  */
 751 extern GTY(()) tree gfor_fndecl_convert_char1_to_char4;
 752 extern GTY(()) tree gfor_fndecl_convert_char4_to_char1;
 753
 754 /* Other misc. runtime library functions.  */
 755 extern GTY(()) tree gfor_fndecl_size0;
 756 extern GTY(()) tree gfor_fndecl_size1;
 757 extern GTY(()) tree gfor_fndecl_iargc;
 758
 759 /* Implemented in Fortran.  */
 760 extern GTY(()) tree gfor_fndecl_sc_kind;
 761 extern GTY(()) tree gfor_fndecl_si_kind;
 762 extern GTY(()) tree gfor_fndecl_sr_kind;
 763
 764
 765 /* True if node is an integer constant.  */
 766 #define INTEGER_CST_P(node) (TREE_CODE(node) == INTEGER_CST)
 767
 768 /* gfortran-specific declaration information, the _CONT versions denote
 769    arrays with CONTIGUOUS attribute.  */
 770
 771 enum gfc_array_kind
 772 {
 773   GFC_ARRAY_UNKNOWN,
 774   GFC_ARRAY_ASSUMED_SHAPE,
 775   GFC_ARRAY_ASSUMED_SHAPE_CONT,
 776   GFC_ARRAY_ASSUMED_RANK,
 777   GFC_ARRAY_ASSUMED_RANK_CONT,
 778   GFC_ARRAY_ALLOCATABLE,
 779   GFC_ARRAY_POINTER,
 780   GFC_ARRAY_POINTER_CONT
 781 };
 782
 783 /* Array types only.  */
 784 /* FIXME: the variable_size annotation here is needed because these types are
 785    variable-sized in some other frontends.  Due to gengtype deficiency the GTY
 786    options of such types have to agree across all frontends. */
 787 struct GTY((variable_size))     lang_type        {
 788   int rank, corank;
 789   enum gfc_array_kind akind;
 790   tree lbound[GFC_MAX_DIMENSIONS];
 791   tree ubound[GFC_MAX_DIMENSIONS];
 792   tree stride[GFC_MAX_DIMENSIONS];
 793   tree size;
 794   tree offset;
 795   tree dtype;
 796   tree dataptr_type;
 797   tree span;
 798   tree base_decl[2];
 799   tree nonrestricted_type;
 800   tree caf_token;
 801   tree caf_offset;
 802 };
 803
 804 struct GTY((variable_size)) lang_decl {
 805   /* Dummy variables.  */
 806   tree saved_descriptor;
 807   /* Assigned integer nodes.  Stringlength is the IO format string's length.
 808      Addr is the address of the string or the target label. Stringlength is
 809      initialized to -2 and assigned to -1 when addr is assigned to the
 810      address of target label.  */
 811   tree stringlen;
 812   tree addr;
 813   tree span;
 814   /* For assumed-shape coarrays.  */
 815   tree token, caf_offset;
 816 };
 817
 818
 819 #define GFC_DECL_ASSIGN_ADDR(node) DECL_LANG_SPECIFIC(node)->addr
 820 #define GFC_DECL_STRING_LEN(node) DECL_LANG_SPECIFIC(node)->stringlen
 821 #define GFC_DECL_SPAN(node) DECL_LANG_SPECIFIC(node)->span
 822 #define GFC_DECL_TOKEN(node) DECL_LANG_SPECIFIC(node)->token
 823 #define GFC_DECL_CAF_OFFSET(node) DECL_LANG_SPECIFIC(node)->caf_offset
 824 #define GFC_DECL_SAVED_DESCRIPTOR(node) \
 825   (DECL_LANG_SPECIFIC(node)->saved_descriptor)
 826 #define GFC_DECL_PACKED_ARRAY(node) DECL_LANG_FLAG_0(node)
 827 #define GFC_DECL_PARTIAL_PACKED_ARRAY(node) DECL_LANG_FLAG_1(node)
 828 #define GFC_DECL_ASSIGN(node) DECL_LANG_FLAG_2(node)
 829 #define GFC_DECL_COMMON_OR_EQUIV(node) DECL_LANG_FLAG_3(node)
 830 #define GFC_DECL_CRAY_POINTEE(node) DECL_LANG_FLAG_4(node)
 831 #define GFC_DECL_RESULT(node) DECL_LANG_FLAG_5(node)
 832 #define GFC_DECL_SUBREF_ARRAY_P(node) DECL_LANG_FLAG_6(node)
 833 #define GFC_DECL_CLASS(node) DECL_LANG_FLAG_8(node)
 834
 835 /* An array descriptor.  */
 836 #define GFC_DESCRIPTOR_TYPE_P(node) TYPE_LANG_FLAG_1(node)
 837 /* An array without a descriptor.  */
 838 #define GFC_ARRAY_TYPE_P(node) TYPE_LANG_FLAG_2(node)
 839 /* Fortran POINTER type.  */
 840 #define GFC_POINTER_TYPE_P(node) TYPE_LANG_FLAG_3(node)
 841 /* Fortran CLASS type.  */
 842 #define GFC_CLASS_TYPE_P(node) TYPE_LANG_FLAG_4(node)
 843 /* The GFC_TYPE_ARRAY_* members are present in both descriptor and
 844    descriptorless array types.  */
 845 #define GFC_TYPE_ARRAY_LBOUND(node, dim) \
 846   (TYPE_LANG_SPECIFIC(node)->lbound[dim])
 847 #define GFC_TYPE_ARRAY_UBOUND(node, dim) \
 848   (TYPE_LANG_SPECIFIC(node)->ubound[dim])
 849 #define GFC_TYPE_ARRAY_STRIDE(node, dim) \
 850   (TYPE_LANG_SPECIFIC(node)->stride[dim])
 851 #define GFC_TYPE_ARRAY_RANK(node) (TYPE_LANG_SPECIFIC(node)->rank)
 852 #define GFC_TYPE_ARRAY_CORANK(node) (TYPE_LANG_SPECIFIC(node)->corank)
 853 #define GFC_TYPE_ARRAY_CAF_TOKEN(node) (TYPE_LANG_SPECIFIC(node)->caf_token)
 854 #define GFC_TYPE_ARRAY_CAF_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->caf_offset)
 855 #define GFC_TYPE_ARRAY_SIZE(node) (TYPE_LANG_SPECIFIC(node)->size)
 856 #define GFC_TYPE_ARRAY_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->offset)
 857 #define GFC_TYPE_ARRAY_AKIND(node) (TYPE_LANG_SPECIFIC(node)->akind)
 858 /* Code should use gfc_get_dtype instead of accessing this directly.  It may
 859    not be known when the type is created.  */
 860 #define GFC_TYPE_ARRAY_DTYPE(node) (TYPE_LANG_SPECIFIC(node)->dtype)
 861 #define GFC_TYPE_ARRAY_DATAPTR_TYPE(node) \
 862   (TYPE_LANG_SPECIFIC(node)->dataptr_type)
 863 #define GFC_TYPE_ARRAY_SPAN(node) (TYPE_LANG_SPECIFIC(node)->span)
 864 #define GFC_TYPE_ARRAY_BASE_DECL(node, internal) \
 865   (TYPE_LANG_SPECIFIC(node)->base_decl[(internal)])
 866
 867
 868 /* Build an expression with void type.  */
 869 #define build1_v(code, arg) \
 870         fold_build1_loc (input_location, code, void_type_node, arg)
 871 #define build2_v(code, arg1, arg2) \
 872         fold_build2_loc (input_location, code, void_type_node, arg1, arg2)
 873 #define build3_v(code, arg1, arg2, arg3) \
 874         fold_build3_loc (input_location, code, void_type_node, arg1, arg2, arg3)
 875 #define build4_v(code, arg1, arg2, arg3, arg4) \
 876         build4_loc (input_location, code, void_type_node, arg1, arg2, \
 877                     arg3, arg4)
 878
 879 /* This group of functions allows a caller to evaluate an expression from
 880    the callee's interface.  It establishes a mapping between the interface's
 881    dummy arguments and the caller's actual arguments, then applies that
 882    mapping to a given gfc_expr.
 883
 884    You can initialize a mapping structure like so:
 885
 886        gfc_interface_mapping mapping;
 887        ...
 888        gfc_init_interface_mapping (&mapping);
 889
 890    You should then evaluate each actual argument into a temporary
 891    gfc_se structure, here called "se", and map the result to the
 892    dummy argument's symbol, here called "sym":
 893
 894        gfc_add_interface_mapping (&mapping, sym, &se);
 895
 896    After adding all mappings, you should call:
 897
 898        gfc_finish_interface_mapping (&mapping, pre, post);
 899
 900    where "pre" and "post" are statement blocks for initialization
 901    and finalization code respectively.  You can then evaluate an
 902    interface expression "expr" as follows:
 903
 904        gfc_apply_interface_mapping (&mapping, se, expr);
 905
 906    Once you've evaluated all expressions, you should free
 907    the mapping structure with:
 908
 909        gfc_free_interface_mapping (&mapping); */
 910
 911
 912 /* This structure represents a mapping from OLD to NEW, where OLD is a
 913    dummy argument symbol and NEW is a symbol that represents the value
 914    of an actual argument.  Mappings are linked together using NEXT
 915    (in no particular order).  */
 916 typedef struct gfc_interface_sym_mapping
 917 {
 918   struct gfc_interface_sym_mapping *next;
 919   gfc_symbol *old;
 920   gfc_symtree *new_sym;
 921   gfc_expr *expr;
 922 }
 923 gfc_interface_sym_mapping;
 924
 925
 926 /* This structure is used by callers to evaluate an expression from
 927    a callee's interface.  */
 928 typedef struct gfc_interface_mapping
 929 {
 930   /* Maps the interface's dummy arguments to the values that the caller
 931      is passing.  The whole list is owned by this gfc_interface_mapping.  */
 932   gfc_interface_sym_mapping *syms;
 933
 934   /* A list of gfc_charlens that were needed when creating copies of
 935      expressions.  The whole list is owned by this gfc_interface_mapping.  */
 936   gfc_charlen *charlens;
 937 }
 938 gfc_interface_mapping;
 939
 940 void gfc_init_interface_mapping (gfc_interface_mapping *);
 941 void gfc_free_interface_mapping (gfc_interface_mapping *);
 942 void gfc_add_interface_mapping (gfc_interface_mapping *,
 943                                 gfc_symbol *, gfc_se *, gfc_expr *);
 944 void gfc_finish_interface_mapping (gfc_interface_mapping *,
 945                                    stmtblock_t *, stmtblock_t *);
 946 void gfc_apply_interface_mapping (gfc_interface_mapping *,
 947                                   gfc_se *, gfc_expr *);
 948
 949
 950 /* Standard error messages used in all the trans-*.c files.  */
 951 extern const char gfc_msg_fault[];
 952 extern const char gfc_msg_wrong_return[];
 953
 954 #define OMPWS_WORKSHARE_FLAG    1       /* Set if in a workshare construct.  */
 955 #define OMPWS_CURR_SINGLEUNIT   2       /* Set if current gfc_code in workshare
 956                                            construct is not workshared.  */
 957 #define OMPWS_SCALARIZER_WS     4       /* Set if scalarizer should attempt
 958                                            to create parallel loops.  */
 959 #define OMPWS_NOWAIT            8       /* Use NOWAIT on OMP_FOR.  */
 960 extern int ompws_flags;
 961
 962 #endif /* GFC_TRANS_H */