gcc/fortran/trans.h

   1 /* Header for code translation functions
   2    Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
   3    Free Software Foundation, Inc.
   4    Contributed by Paul Brook
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GFC_TRANS_H
  23 #define GFC_TRANS_H
  24
  25 /* Mangled symbols take the form __module__name.  */
  26 #define GFC_MAX_MANGLED_SYMBOL_LEN  (GFC_MAX_SYMBOL_LEN*2+4)
  27
  28 /* Struct for holding a block of statements.  It should be treated as an
  29    opaque entity and not modified directly.  This allows us to change the
  30    underlying representation of statement lists.  */
  31 typedef struct
  32 {
  33   tree head;
  34   unsigned int has_scope:1;
  35 }
  36 stmtblock_t;
  37
  38 /* a simplified expression */
  39 typedef struct gfc_se
  40 {
  41   /* Code blocks to be executed before and after using the value.  */
  42   stmtblock_t pre;
  43   stmtblock_t post;
  44
  45   /* the result of the expression */
  46   tree expr;
  47
  48   /* The length of a character string value.  */
  49   tree string_length;
  50
  51   /* If set gfc_conv_variable will return an expression for the array
  52      descriptor. When set, want_pointer should also be set.
  53      If not set scalarizing variables will be substituted.  */
  54   unsigned descriptor_only:1;
  55
  56   /* When this is set gfc_conv_expr returns the address of a variable.  Only
  57      applies to EXPR_VARIABLE nodes.
  58      Also used by gfc_conv_array_parameter. When set this indicates a pointer
  59      to the descriptor should be returned, rather than the descriptor itself.
  60    */
  61   unsigned want_pointer:1;
  62
  63   /* An array function call returning without a temporary.  Also used for array
  64      pointer assignments.  */
  65   unsigned direct_byref:1;
  66
  67   /* If direct_byref is set, do work out the descriptor as in that case but
  68      do still create a new descriptor variable instead of using an
  69      existing one.  This is useful for special pointer assignments like
  70      rank remapping where we have to process the descriptor before
  71      assigning to final one.  */
  72   unsigned byref_noassign:1;
  73
  74   /* Ignore absent optional arguments.  Used for some intrinsics.  */
  75   unsigned ignore_optional:1;
  76
  77   /* When this is set the data and offset fields of the returned descriptor
  78      are NULL.  Used by intrinsic size.  */
  79   unsigned data_not_needed:1;
  80
  81   /* If set, gfc_conv_procedure_call does not put byref calls into se->pre.  */
  82   unsigned no_function_call:1;
  83
  84   /* If set, we will force the creation of a temporary. Useful to disable
  85      non-copying procedure argument passing optimizations, when some function
  86      args alias.  */
  87   unsigned force_tmp:1;
  88
  89   unsigned want_coarray:1;
  90
  91   /* Scalarization parameters.  */
  92   struct gfc_se *parent;
  93   struct gfc_ss *ss;
  94   struct gfc_loopinfo *loop;
  95 }
  96 gfc_se;
  97
  98
  99 /* Denotes different types of coarray.
 100    Please keep in sync with libgfortran/caf/libcaf.h.  */
 101 typedef enum
 102 {
 103   GFC_CAF_COARRAY_STATIC,
 104   GFC_CAF_COARRAY_ALLOC,
 105   GFC_CAF_LOCK,
 106   GFC_CAF_LOCK_COMP
 107 }
 108 gfc_coarray_type;
 109
 110
 111 /* The array-specific scalarization informations.  The array members of
 112    this struct are indexed by actual array index, and thus can be sparse.  */
 113
 114 typedef struct gfc_array_info
 115 {
 116   mpz_t *shape;
 117
 118   /* The ref that holds information on this section.  */
 119   gfc_ref *ref;
 120   /* The descriptor of this array.  */
 121   tree descriptor;
 122   /* holds the pointer to the data array.  */
 123   tree data;
 124   /* To move some of the array index calculation out of the innermost loop.  */
 125   tree offset;
 126   tree saved_offset;
 127   tree stride0;
 128   /* Holds the SS for a subscript.  Indexed by actual dimension.  */
 129   struct gfc_ss *subscript[GFC_MAX_DIMENSIONS];
 130
 131   /* stride and delta are used to access this inside a scalarization loop.
 132      start is used in the calculation of these.  Indexed by scalarizer
 133      dimension.  */
 134   tree start[GFC_MAX_DIMENSIONS];
 135   tree end[GFC_MAX_DIMENSIONS];
 136   tree stride[GFC_MAX_DIMENSIONS];
 137   tree delta[GFC_MAX_DIMENSIONS];
 138 }
 139 gfc_array_info;
 140
 141 typedef enum
 142 {
 143   /* A scalar value.  This will be evaluated before entering the
 144      scalarization loop.  */
 145   GFC_SS_SCALAR,
 146
 147   /* Like GFC_SS_SCALAR it evaluates the expression outside the
 148      loop. Is always evaluated as a reference to the temporary.
 149      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   gfc_ss_type type;
 189   gfc_expr *expr;
 190   tree string_length;
 191 }
 192 gfc_ss_info;
 193
 194 #define gfc_get_ss_info() XCNEW (gfc_ss_info)
 195
 196
 197 /* Scalarization State chain.  Created by walking an expression tree before
 198    creating the scalarization loops.  Then passed as part of a gfc_se structure
 199    to translate the expression inside the loop.  Note that these chains are
 200    terminated by gfc_ss_terminator, not NULL.  A NULL pointer in a gfc_se
 201    indicates to gfc_conv_* that this is a scalar expression.
 202    SS structures can only belong to a single loopinfo.  They must be added
 203    otherwise they will not get freed.  */
 204
 205 typedef struct gfc_ss
 206 {
 207   gfc_ss_info *info;
 208
 209   union
 210   {
 211     /* If type is GFC_SS_SCALAR or GFC_SS_REFERENCE.  */
 212     struct
 213     {
 214       tree expr;
 215     }
 216     scalar;
 217
 218     /* GFC_SS_TEMP.  */
 219     struct
 220     {
 221       tree type;
 222     }
 223     temp;
 224     /* All other types.  */
 225     gfc_array_info info;
 226   }
 227   data;
 228
 229   int dimen;
 230   /* Translation from loop dimensions to actual array dimensions.
 231      actual_dim = dim[loop_dim]  */
 232   int dim[GFC_MAX_DIMENSIONS];
 233
 234   /* All the SS in a loop and linked through loop_chain.  The SS for an
 235      expression are linked by the next pointer.  */
 236   struct gfc_ss *loop_chain;
 237   struct gfc_ss *next;
 238
 239   /* This is used by assignments requiring temporaries. The bits specify which
 240      loops the terms appear in.  This will be 1 for the RHS expressions,
 241      2 for the LHS expressions, and 3(=1|2) for the temporary.  The bit
 242      'where' suppresses precalculation of scalars in WHERE assignments.  */
 243   unsigned useflags:2, where:1, is_alloc_lhs:1;
 244 }
 245 gfc_ss;
 246 #define gfc_get_ss() XCNEW (gfc_ss)
 247
 248 /* The contents of this aren't actually used.  A NULL SS chain indicates a
 249    scalar expression, so this pointer is used to terminate SS chains.  */
 250 extern gfc_ss * const gfc_ss_terminator;
 251
 252 /* Holds information about an expression while it is being scalarized.  */
 253 typedef struct gfc_loopinfo
 254 {
 255   stmtblock_t pre;
 256   stmtblock_t post;
 257
 258   int dimen;
 259
 260   /* All the SS involved with this loop.  */
 261   gfc_ss *ss;
 262   /* The SS describing the temporary used in an assignment.  */
 263   gfc_ss *temp_ss;
 264
 265   /* The scalarization loop index variables.  */
 266   tree loopvar[GFC_MAX_DIMENSIONS];
 267
 268   /* The bounds of the scalarization loops.  */
 269   tree from[GFC_MAX_DIMENSIONS];
 270   tree to[GFC_MAX_DIMENSIONS];
 271   gfc_ss *specloop[GFC_MAX_DIMENSIONS];
 272
 273   /* The code member contains the code for the body of the next outer loop.  */
 274   stmtblock_t code[GFC_MAX_DIMENSIONS];
 275
 276   /* Order in which the dimensions should be looped, innermost first.  */
 277   int order[GFC_MAX_DIMENSIONS];
 278
 279   /* Enum to control loop reversal.  */
 280   gfc_reverse reverse[GFC_MAX_DIMENSIONS];
 281
 282   /* The number of dimensions for which a temporary is used.  */
 283   int temp_dim;
 284
 285   /* If set we don't need the loop variables.  */
 286   unsigned array_parameter:1;
 287 }
 288 gfc_loopinfo;
 289
 290
 291 /* Information about a symbol that has been shadowed by a temporary.  */
 292 typedef struct
 293 {
 294   symbol_attribute attr;
 295   tree decl;
 296 }
 297 gfc_saved_var;
 298
 299
 300 /* Store information about a block of code together with special
 301    initialization and clean-up code.  This can be used to incrementally add
 302    init and cleanup, and in the end put everything together to a
 303    try-finally expression.  */
 304 typedef struct
 305 {
 306   tree init;
 307   tree cleanup;
 308   tree code;
 309 }
 310 gfc_wrapped_block;
 311
 312
 313 /* Initialize an init/cleanup block.  */
 314 void gfc_start_wrapped_block (gfc_wrapped_block* block, tree code);
 315 /* Add a pair of init/cleanup code to the block.  Each one might be a
 316    NULL_TREE if not required.  */
 317 void gfc_add_init_cleanup (gfc_wrapped_block* block, tree init, tree cleanup);
 318 /* Finalize the block, that is, create a single expression encapsulating the
 319    original code together with init and clean-up code.  */
 320 tree gfc_finish_wrapped_block (gfc_wrapped_block* block);
 321
 322
 323 /* Advance the SS chain to the next term.  */
 324 void gfc_advance_se_ss_chain (gfc_se *);
 325
 326 /* Call this to initialize a gfc_se structure before use
 327    first parameter is structure to initialize, second is
 328    parent to get scalarization data from, or NULL.  */
 329 void gfc_init_se (gfc_se *, gfc_se *);
 330
 331 /* Create an artificial variable decl and add it to the current scope.  */
 332 tree gfc_create_var (tree, const char *);
 333 /* Like above but doesn't add it to the current scope.  */
 334 tree gfc_create_var_np (tree, const char *);
 335
 336 /* Store the result of an expression in a temp variable so it can be used
 337    repeatedly even if the original changes */
 338 void gfc_make_safe_expr (gfc_se * se);
 339
 340 /* Makes sure se is suitable for passing as a function string parameter.  */
 341 void gfc_conv_string_parameter (gfc_se * se);
 342
 343 /* Compare two strings.  */
 344 tree gfc_build_compare_string (tree, tree, tree, tree, int, enum tree_code);
 345
 346 /* When using the gfc_conv_* make sure you understand what they do, i.e.
 347    when a POST chain may be created, and what the returned expression may be
 348    used for.  Note that character strings have special handling.  This
 349    should not be a problem as most statements/operations only deal with
 350    numeric/logical types.  See the implementations in trans-expr.c
 351    for details of the individual functions.  */
 352
 353 void gfc_conv_expr (gfc_se * se, gfc_expr * expr);
 354 void gfc_conv_expr_val (gfc_se * se, gfc_expr * expr);
 355 void gfc_conv_expr_lhs (gfc_se * se, gfc_expr * expr);
 356 void gfc_conv_expr_reference (gfc_se * se, gfc_expr *);
 357 void gfc_conv_expr_type (gfc_se * se, gfc_expr *, tree);
 358
 359 /* trans-expr.c */
 360 void gfc_conv_scalar_char_value (gfc_symbol *sym, gfc_se *se, gfc_expr **expr);
 361 tree gfc_string_to_single_character (tree len, tree str, int kind);
 362
 363 /* Find the decl containing the auxiliary variables for assigned variables.  */
 364 void gfc_conv_label_variable (gfc_se * se, gfc_expr * expr);
 365 /* If the value is not constant, Create a temporary and copy the value.  */
 366 tree gfc_evaluate_now_loc (location_t, tree, stmtblock_t *);
 367 tree gfc_evaluate_now (tree, stmtblock_t *);
 368
 369 /* Find the appropriate variant of a math intrinsic.  */
 370 tree gfc_builtin_decl_for_float_kind (enum built_in_function, int);
 371
 372 /* Intrinsic procedure handling.  */
 373 tree gfc_conv_intrinsic_subroutine (gfc_code *);
 374 void gfc_conv_intrinsic_function (gfc_se *, gfc_expr *);
 375
 376 /* Is the intrinsic expanded inline.  */
 377 bool gfc_inline_intrinsic_function_p (gfc_expr *);
 378
 379 /* Does an intrinsic map directly to an external library call
 380    This is true for array-returning intrinsics, unless
 381    gfc_inline_intrinsic_function_p returns true.  */
 382 int gfc_is_intrinsic_libcall (gfc_expr *);
 383
 384 /* Used to call ordinary functions/subroutines
 385    and procedure pointer components.  */
 386 int gfc_conv_procedure_call (gfc_se *, gfc_symbol *, gfc_actual_arglist *,
 387                              gfc_expr *, VEC(tree,gc) *);
 388
 389 void gfc_conv_subref_array_arg (gfc_se *, gfc_expr *, int, sym_intent, bool);
 390
 391 /* gfc_trans_* shouldn't call push/poplevel, use gfc_push/pop_scope */
 392
 393 /* Generate code for a scalar assignment.  */
 394 tree gfc_trans_scalar_assign (gfc_se *, gfc_se *, gfc_typespec, bool, bool,
 395                               bool);
 396
 397 /* Translate COMMON blocks.  */
 398 void gfc_trans_common (gfc_namespace *);
 399
 400 /* Translate a derived type constructor.  */
 401 void gfc_conv_structure (gfc_se *, gfc_expr *, int);
 402
 403 /* Return an expression which determines if a dummy parameter is present.  */
 404 tree gfc_conv_expr_present (gfc_symbol *);
 405 /* Convert a missing, dummy argument into a null or zero.  */
 406 void gfc_conv_missing_dummy (gfc_se *, gfc_expr *, gfc_typespec, int);
 407
 408 /* Generate code to allocate a string temporary.  */
 409 tree gfc_conv_string_tmp (gfc_se *, tree, tree);
 410 /* Get the string length variable belonging to an expression.  */
 411 tree gfc_get_expr_charlen (gfc_expr *);
 412 /* Initialize a string length variable.  */
 413 void gfc_conv_string_length (gfc_charlen *, gfc_expr *, stmtblock_t *);
 414 /* Ensure type sizes can be gimplified.  */
 415 void gfc_trans_vla_type_sizes (gfc_symbol *, stmtblock_t *);
 416
 417 /* Add an expression to the end of a block.  */
 418 void gfc_add_expr_to_block (stmtblock_t *, tree);
 419 /* Add an expression to the beginning of a block.  */
 420 void gfc_prepend_expr_to_block (stmtblock_t *, tree);
 421 /* Add a block to the end of a block.  */
 422 void gfc_add_block_to_block (stmtblock_t *, stmtblock_t *);
 423 /* Add a MODIFY_EXPR to a block.  */
 424 void gfc_add_modify_loc (location_t, stmtblock_t *, tree, tree);
 425 void gfc_add_modify (stmtblock_t *, tree, tree);
 426
 427 /* Initialize a statement block.  */
 428 void gfc_init_block (stmtblock_t *);
 429 /* Start a new statement block.  Like gfc_init_block but also starts a new
 430    variable scope.  */
 431 void gfc_start_block (stmtblock_t *);
 432 /* Finish a statement block.  Also closes the scope if the block was created
 433    with gfc_start_block.  */
 434 tree gfc_finish_block (stmtblock_t *);
 435 /* Merge the scope of a block with its parent.  */
 436 void gfc_merge_block_scope (stmtblock_t * block);
 437
 438 /* Return the backend label decl.  */
 439 tree gfc_get_label_decl (gfc_st_label *);
 440
 441 /* Return the decl for an external function.  */
 442 tree gfc_get_extern_function_decl (gfc_symbol *);
 443
 444 /* Return the decl for a function.  */
 445 tree gfc_get_function_decl (gfc_symbol *);
 446
 447 /* Build an ADDR_EXPR.  */
 448 tree gfc_build_addr_expr (tree, tree);
 449
 450 /* Build an ARRAY_REF.  */
 451 tree gfc_build_array_ref (tree, tree, tree);
 452
 453 /* Creates a label.  Decl is artificial if label_id == NULL_TREE.  */
 454 tree gfc_build_label_decl (tree);
 455
 456 /* Return the decl used to hold the function return value.
 457    Do not use if the function has an explicit result variable.  */
 458 tree gfc_get_fake_result_decl (gfc_symbol *, int);
 459
 460 /* Add a decl to the binding level for the current function.  */
 461 void gfc_add_decl_to_function (tree);
 462
 463 /* Make prototypes for runtime library functions.  */
 464 void gfc_build_builtin_function_decls (void);
 465
 466 /* Set the backend source location of a decl.  */
 467 void gfc_set_decl_location (tree, locus *);
 468
 469 /* Get a module symbol backend_decl if possible.  */
 470 bool gfc_get_module_backend_decl (gfc_symbol *);
 471
 472 /* Return the variable decl for a symbol.  */
 473 tree gfc_get_symbol_decl (gfc_symbol *);
 474
 475 /* Build a static initializer.  */
 476 tree gfc_conv_initializer (gfc_expr *, gfc_typespec *, tree, bool, bool, bool);
 477
 478 /* Assign a default initializer to a derived type.  */
 479 void gfc_init_default_dt (gfc_symbol *, stmtblock_t *, bool);
 480
 481 /* Substitute a temporary variable in place of the real one.  */
 482 void gfc_shadow_sym (gfc_symbol *, tree, gfc_saved_var *);
 483
 484 /* Restore the original variable.  */
 485 void gfc_restore_sym (gfc_symbol *, gfc_saved_var *);
 486
 487 /* Setting a decl assembler name, mangling it according to target rules
 488    (like Windows @NN decorations).  */
 489 void gfc_set_decl_assembler_name (tree, tree);
 490
 491 /* Returns true if a variable of specified size should go on the stack.  */
 492 int gfc_can_put_var_on_stack (tree);
 493
 494 /* Allocate the lang-specific part of a decl node.  */
 495 void gfc_allocate_lang_decl (tree);
 496
 497 /* Advance along a TREE_CHAIN.  */
 498 tree gfc_advance_chain (tree, int);
 499
 500 /* Create a decl for a function.  */
 501 void gfc_create_function_decl (gfc_namespace *, bool);
 502 /* Generate the code for a function.  */
 503 void gfc_generate_function_code (gfc_namespace *);
 504 /* Output a BLOCK DATA program unit.  */
 505 void gfc_generate_block_data (gfc_namespace *);
 506 /* Output a decl for a module variable.  */
 507 void gfc_generate_module_vars (gfc_namespace *);
 508 /* Get the appropriate return statement for a procedure.  */
 509 tree gfc_generate_return (void);
 510
 511 struct GTY(()) module_htab_entry {
 512   const char *name;
 513   tree namespace_decl;
 514   htab_t GTY ((param_is (union tree_node))) decls;
 515 };
 516
 517 struct module_htab_entry *gfc_find_module (const char *);
 518 void gfc_module_add_decl (struct module_htab_entry *, tree);
 519
 520 /* Get and set the current location.  */
 521 void gfc_save_backend_locus (locus *);
 522 void gfc_set_backend_locus (locus *);
 523 void gfc_restore_backend_locus (locus *);
 524
 525 /* Handle static constructor functions.  */
 526 extern GTY(()) tree gfc_static_ctors;
 527 void gfc_generate_constructors (void);
 528
 529 /* Get the string length of an array constructor.  */
 530 bool get_array_ctor_strlen (stmtblock_t *, gfc_constructor_base, tree *);
 531
 532 /* Mark a condition as likely or unlikely.  */
 533 tree gfc_likely (tree);
 534 tree gfc_unlikely (tree);
 535
 536 /* Generate a runtime error call.  */
 537 tree gfc_trans_runtime_error (bool, locus*, const char*, ...);
 538
 539 /* Generate a runtime warning/error check.  */
 540 void gfc_trans_runtime_check (bool, bool, tree, stmtblock_t *, locus *,
 541                               const char *, ...);
 542
 543 /* Generate a runtime check for same string length.  */
 544 void gfc_trans_same_strlen_check (const char*, locus*, tree, tree,
 545                                   stmtblock_t*);
 546
 547 /* Generate a call to free() after checking that its arg is non-NULL.  */
 548 tree gfc_call_free (tree);
 549
 550 /* Allocate memory after performing a few checks.  */
 551 tree gfc_call_malloc (stmtblock_t *, tree, tree);
 552
 553 /* Build a memcpy call.  */
 554 tree gfc_build_memcpy_call (tree, tree, tree);
 555
 556 /* Allocate memory for allocatable variables, with optional status variable.  */
 557 void gfc_allocate_allocatable (stmtblock_t*, tree, tree, tree,
 558                                tree, tree, tree, gfc_expr*);
 559
 560 /* Allocate memory, with optional status variable.  */
 561 void gfc_allocate_using_malloc (stmtblock_t *, tree, tree, tree);
 562
 563 /* Generate code to deallocate an array.  */
 564 tree gfc_deallocate_with_status (tree, tree, bool, gfc_expr*);
 565 tree gfc_deallocate_scalar_with_status (tree, tree, bool, gfc_expr*, gfc_typespec);
 566
 567 /* Generate code to call realloc().  */
 568 tree gfc_call_realloc (stmtblock_t *, tree, tree);
 569
 570 /* Generate code for an assignment, includes scalarization.  */
 571 tree gfc_trans_assignment (gfc_expr *, gfc_expr *, bool, bool);
 572
 573 /* Generate code for a pointer assignment.  */
 574 tree gfc_trans_pointer_assignment (gfc_expr *, gfc_expr *);
 575
 576 /* Initialize function decls for library functions.  */
 577 void gfc_build_intrinsic_lib_fndecls (void);
 578 /* Create function decls for IO library functions.  */
 579 void gfc_trans_io_runtime_check (tree, tree, int, const char *, stmtblock_t *);
 580 void gfc_build_io_library_fndecls (void);
 581 /* Build a function decl for a library function.  */
 582 tree gfc_build_library_function_decl (tree, tree, int, ...);
 583 tree gfc_build_library_function_decl_with_spec (tree name, const char *spec,
 584                                                 tree rettype, int nargs, ...);
 585
 586 /* Process the local variable decls of a block construct.  */
 587 void gfc_process_block_locals (gfc_namespace*);
 588
 589 /* Output initialization/clean-up code that was deferred.  */
 590 void gfc_trans_deferred_vars (gfc_symbol*, gfc_wrapped_block *);
 591
 592 /* In f95-lang.c.  */
 593 tree pushdecl (tree);
 594 tree pushdecl_top_level (tree);
 595 void pushlevel (int);
 596 tree poplevel (int, int, int);
 597 tree getdecls (void);
 598 tree gfc_truthvalue_conversion (tree);
 599 tree gfc_builtin_function (tree);
 600
 601 /* In trans-types.c.  */
 602 struct array_descr_info;
 603 bool gfc_get_array_descr_info (const_tree, struct array_descr_info *);
 604
 605 /* In trans-openmp.c */
 606 bool gfc_omp_privatize_by_reference (const_tree);
 607 enum omp_clause_default_kind gfc_omp_predetermined_sharing (tree);
 608 tree gfc_omp_report_decl (tree);
 609 tree gfc_omp_clause_default_ctor (tree, tree, tree);
 610 tree gfc_omp_clause_copy_ctor (tree, tree, tree);
 611 tree gfc_omp_clause_assign_op (tree, tree, tree);
 612 tree gfc_omp_clause_dtor (tree, tree);
 613 bool gfc_omp_disregard_value_expr (tree, bool);
 614 bool gfc_omp_private_debug_clause (tree, bool);
 615 bool gfc_omp_private_outer_ref (tree);
 616 struct gimplify_omp_ctx;
 617 void gfc_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *, tree);
 618
 619 /* Runtime library function decls.  */
 620 extern GTY(()) tree gfor_fndecl_pause_numeric;
 621 extern GTY(()) tree gfor_fndecl_pause_string;
 622 extern GTY(()) tree gfor_fndecl_stop_numeric;
 623 extern GTY(()) tree gfor_fndecl_stop_numeric_f08;
 624 extern GTY(()) tree gfor_fndecl_stop_string;
 625 extern GTY(()) tree gfor_fndecl_error_stop_numeric;
 626 extern GTY(()) tree gfor_fndecl_error_stop_string;
 627 extern GTY(()) tree gfor_fndecl_runtime_error;
 628 extern GTY(()) tree gfor_fndecl_runtime_error_at;
 629 extern GTY(()) tree gfor_fndecl_runtime_warning_at;
 630 extern GTY(()) tree gfor_fndecl_os_error;
 631 extern GTY(()) tree gfor_fndecl_generate_error;
 632 extern GTY(()) tree gfor_fndecl_set_fpe;
 633 extern GTY(()) tree gfor_fndecl_set_options;
 634 extern GTY(()) tree gfor_fndecl_ttynam;
 635 extern GTY(()) tree gfor_fndecl_ctime;
 636 extern GTY(()) tree gfor_fndecl_fdate;
 637 extern GTY(()) tree gfor_fndecl_in_pack;
 638 extern GTY(()) tree gfor_fndecl_in_unpack;
 639 extern GTY(()) tree gfor_fndecl_associated;
 640
 641
 642 /* Coarray run-time library function decls.  */
 643 extern GTY(()) tree gfor_fndecl_caf_init;
 644 extern GTY(()) tree gfor_fndecl_caf_finalize;
 645 extern GTY(()) tree gfor_fndecl_caf_register;
 646 extern GTY(()) tree gfor_fndecl_caf_critical;
 647 extern GTY(()) tree gfor_fndecl_caf_end_critical;
 648 extern GTY(()) tree gfor_fndecl_caf_sync_all;
 649 extern GTY(()) tree gfor_fndecl_caf_sync_images;
 650 extern GTY(()) tree gfor_fndecl_caf_error_stop;
 651 extern GTY(()) tree gfor_fndecl_caf_error_stop_str;
 652
 653 /* Coarray global variables for num_images/this_image.  */
 654 extern GTY(()) tree gfort_gvar_caf_num_images;
 655 extern GTY(()) tree gfort_gvar_caf_this_image;
 656
 657
 658 /* Math functions.  Many other math functions are handled in
 659    trans-intrinsic.c.  */
 660
 661 typedef struct GTY(()) gfc_powdecl_list {
 662   tree integer;
 663   tree real;
 664   tree cmplx;
 665 }
 666 gfc_powdecl_list;
 667
 668 extern GTY(()) gfc_powdecl_list gfor_fndecl_math_powi[4][3];
 669 extern GTY(()) tree gfor_fndecl_math_ishftc4;
 670 extern GTY(()) tree gfor_fndecl_math_ishftc8;
 671 extern GTY(()) tree gfor_fndecl_math_ishftc16;
 672
 673 /* BLAS functions.  */
 674 extern GTY(()) tree gfor_fndecl_sgemm;
 675 extern GTY(()) tree gfor_fndecl_dgemm;
 676 extern GTY(()) tree gfor_fndecl_cgemm;
 677 extern GTY(()) tree gfor_fndecl_zgemm;
 678
 679 /* String functions.  */
 680 extern GTY(()) tree gfor_fndecl_compare_string;
 681 extern GTY(()) tree gfor_fndecl_concat_string;
 682 extern GTY(()) tree gfor_fndecl_string_len_trim;
 683 extern GTY(()) tree gfor_fndecl_string_index;
 684 extern GTY(()) tree gfor_fndecl_string_scan;
 685 extern GTY(()) tree gfor_fndecl_string_verify;
 686 extern GTY(()) tree gfor_fndecl_string_trim;
 687 extern GTY(()) tree gfor_fndecl_string_minmax;
 688 extern GTY(()) tree gfor_fndecl_adjustl;
 689 extern GTY(()) tree gfor_fndecl_adjustr;
 690 extern GTY(()) tree gfor_fndecl_select_string;
 691 extern GTY(()) tree gfor_fndecl_compare_string_char4;
 692 extern GTY(()) tree gfor_fndecl_concat_string_char4;
 693 extern GTY(()) tree gfor_fndecl_string_len_trim_char4;
 694 extern GTY(()) tree gfor_fndecl_string_index_char4;
 695 extern GTY(()) tree gfor_fndecl_string_scan_char4;
 696 extern GTY(()) tree gfor_fndecl_string_verify_char4;
 697 extern GTY(()) tree gfor_fndecl_string_trim_char4;
 698 extern GTY(()) tree gfor_fndecl_string_minmax_char4;
 699 extern GTY(()) tree gfor_fndecl_adjustl_char4;
 700 extern GTY(()) tree gfor_fndecl_adjustr_char4;
 701 extern GTY(()) tree gfor_fndecl_select_string_char4;
 702
 703 /* Conversion between character kinds.  */
 704 extern GTY(()) tree gfor_fndecl_convert_char1_to_char4;
 705 extern GTY(()) tree gfor_fndecl_convert_char4_to_char1;
 706
 707 /* Other misc. runtime library functions.  */
 708 extern GTY(()) tree gfor_fndecl_size0;
 709 extern GTY(()) tree gfor_fndecl_size1;
 710 extern GTY(()) tree gfor_fndecl_iargc;
 711
 712 /* Implemented in Fortran.  */
 713 extern GTY(()) tree gfor_fndecl_sc_kind;
 714 extern GTY(()) tree gfor_fndecl_si_kind;
 715 extern GTY(()) tree gfor_fndecl_sr_kind;
 716
 717
 718 /* True if node is an integer constant.  */
 719 #define INTEGER_CST_P(node) (TREE_CODE(node) == INTEGER_CST)
 720
 721 /* gfortran-specific declaration information, the _CONT versions denote
 722    arrays with CONTIGUOUS attribute.  */
 723
 724 enum gfc_array_kind
 725 {
 726   GFC_ARRAY_UNKNOWN,
 727   GFC_ARRAY_ASSUMED_SHAPE,
 728   GFC_ARRAY_ASSUMED_SHAPE_CONT,
 729   GFC_ARRAY_ALLOCATABLE,
 730   GFC_ARRAY_POINTER,
 731   GFC_ARRAY_POINTER_CONT
 732 };
 733
 734 /* Array types only.  */
 735 /* FIXME: the variable_size annotation here is needed because these types are
 736    variable-sized in some other frontends.  Due to gengtype deficiency the GTY
 737    options of such types have to agree across all frontends. */
 738 struct GTY((variable_size))     lang_type        {
 739   int rank, corank;
 740   enum gfc_array_kind akind;
 741   tree lbound[GFC_MAX_DIMENSIONS];
 742   tree ubound[GFC_MAX_DIMENSIONS];
 743   tree stride[GFC_MAX_DIMENSIONS];
 744   tree size;
 745   tree offset;
 746   tree dtype;
 747   tree dataptr_type;
 748   tree span;
 749   tree base_decl[2];
 750   tree nonrestricted_type;
 751   tree caf_token;
 752   tree caf_offset;
 753 };
 754
 755 struct GTY((variable_size)) lang_decl {
 756   /* Dummy variables.  */
 757   tree saved_descriptor;
 758   /* Assigned integer nodes.  Stringlength is the IO format string's length.
 759      Addr is the address of the string or the target label. Stringlength is
 760      initialized to -2 and assigned to -1 when addr is assigned to the
 761      address of target label.  */
 762   tree stringlen;
 763   tree addr;
 764   tree span;
 765   /* For assumed-shape coarrays.  */
 766   tree token, caf_offset;
 767 };
 768
 769
 770 #define GFC_DECL_ASSIGN_ADDR(node) DECL_LANG_SPECIFIC(node)->addr
 771 #define GFC_DECL_STRING_LEN(node) DECL_LANG_SPECIFIC(node)->stringlen
 772 #define GFC_DECL_SPAN(node) DECL_LANG_SPECIFIC(node)->span
 773 #define GFC_DECL_TOKEN(node) DECL_LANG_SPECIFIC(node)->token
 774 #define GFC_DECL_CAF_OFFSET(node) DECL_LANG_SPECIFIC(node)->caf_offset
 775 #define GFC_DECL_SAVED_DESCRIPTOR(node) \
 776   (DECL_LANG_SPECIFIC(node)->saved_descriptor)
 777 #define GFC_DECL_PACKED_ARRAY(node) DECL_LANG_FLAG_0(node)
 778 #define GFC_DECL_PARTIAL_PACKED_ARRAY(node) DECL_LANG_FLAG_1(node)
 779 #define GFC_DECL_ASSIGN(node) DECL_LANG_FLAG_2(node)
 780 #define GFC_DECL_COMMON_OR_EQUIV(node) DECL_LANG_FLAG_3(node)
 781 #define GFC_DECL_CRAY_POINTEE(node) DECL_LANG_FLAG_4(node)
 782 #define GFC_DECL_RESULT(node) DECL_LANG_FLAG_5(node)
 783 #define GFC_DECL_SUBREF_ARRAY_P(node) DECL_LANG_FLAG_6(node)
 784
 785 /* An array descriptor.  */
 786 #define GFC_DESCRIPTOR_TYPE_P(node) TYPE_LANG_FLAG_1(node)
 787 /* An array without a descriptor.  */
 788 #define GFC_ARRAY_TYPE_P(node) TYPE_LANG_FLAG_2(node)
 789 /* Fortran POINTER type.  */
 790 #define GFC_POINTER_TYPE_P(node) TYPE_LANG_FLAG_3(node)
 791 /* The GFC_TYPE_ARRAY_* members are present in both descriptor and
 792    descriptorless array types.  */
 793 #define GFC_TYPE_ARRAY_LBOUND(node, dim) \
 794   (TYPE_LANG_SPECIFIC(node)->lbound[dim])
 795 #define GFC_TYPE_ARRAY_UBOUND(node, dim) \
 796   (TYPE_LANG_SPECIFIC(node)->ubound[dim])
 797 #define GFC_TYPE_ARRAY_STRIDE(node, dim) \
 798   (TYPE_LANG_SPECIFIC(node)->stride[dim])
 799 #define GFC_TYPE_ARRAY_RANK(node) (TYPE_LANG_SPECIFIC(node)->rank)
 800 #define GFC_TYPE_ARRAY_CORANK(node) (TYPE_LANG_SPECIFIC(node)->corank)
 801 #define GFC_TYPE_ARRAY_CAF_TOKEN(node) (TYPE_LANG_SPECIFIC(node)->caf_token)
 802 #define GFC_TYPE_ARRAY_CAF_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->caf_offset)
 803 #define GFC_TYPE_ARRAY_SIZE(node) (TYPE_LANG_SPECIFIC(node)->size)
 804 #define GFC_TYPE_ARRAY_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->offset)
 805 #define GFC_TYPE_ARRAY_AKIND(node) (TYPE_LANG_SPECIFIC(node)->akind)
 806 /* Code should use gfc_get_dtype instead of accessing this directly.  It may
 807    not be known when the type is created.  */
 808 #define GFC_TYPE_ARRAY_DTYPE(node) (TYPE_LANG_SPECIFIC(node)->dtype)
 809 #define GFC_TYPE_ARRAY_DATAPTR_TYPE(node) \
 810   (TYPE_LANG_SPECIFIC(node)->dataptr_type)
 811 #define GFC_TYPE_ARRAY_SPAN(node) (TYPE_LANG_SPECIFIC(node)->span)
 812 #define GFC_TYPE_ARRAY_BASE_DECL(node, internal) \
 813   (TYPE_LANG_SPECIFIC(node)->base_decl[(internal)])
 814
 815
 816 /* Build an expression with void type.  */
 817 #define build1_v(code, arg) \
 818         fold_build1_loc (input_location, code, void_type_node, arg)
 819 #define build2_v(code, arg1, arg2) \
 820         fold_build2_loc (input_location, code, void_type_node, arg1, arg2)
 821 #define build3_v(code, arg1, arg2, arg3) \
 822         fold_build3_loc (input_location, code, void_type_node, arg1, arg2, arg3)
 823 #define build4_v(code, arg1, arg2, arg3, arg4) \
 824         build4_loc (input_location, code, void_type_node, arg1, arg2, \
 825                     arg3, arg4)
 826
 827 /* This group of functions allows a caller to evaluate an expression from
 828    the callee's interface.  It establishes a mapping between the interface's
 829    dummy arguments and the caller's actual arguments, then applies that
 830    mapping to a given gfc_expr.
 831
 832    You can initialize a mapping structure like so:
 833
 834        gfc_interface_mapping mapping;
 835        ...
 836        gfc_init_interface_mapping (&mapping);
 837
 838    You should then evaluate each actual argument into a temporary
 839    gfc_se structure, here called "se", and map the result to the
 840    dummy argument's symbol, here called "sym":
 841
 842        gfc_add_interface_mapping (&mapping, sym, &se);
 843
 844    After adding all mappings, you should call:
 845
 846        gfc_finish_interface_mapping (&mapping, pre, post);
 847
 848    where "pre" and "post" are statement blocks for initialization
 849    and finalization code respectively.  You can then evaluate an
 850    interface expression "expr" as follows:
 851
 852        gfc_apply_interface_mapping (&mapping, se, expr);
 853
 854    Once you've evaluated all expressions, you should free
 855    the mapping structure with:
 856
 857        gfc_free_interface_mapping (&mapping); */
 858
 859
 860 /* This structure represents a mapping from OLD to NEW, where OLD is a
 861    dummy argument symbol and NEW is a symbol that represents the value
 862    of an actual argument.  Mappings are linked together using NEXT
 863    (in no particular order).  */
 864 typedef struct gfc_interface_sym_mapping
 865 {
 866   struct gfc_interface_sym_mapping *next;
 867   gfc_symbol *old;
 868   gfc_symtree *new_sym;
 869   gfc_expr *expr;
 870 }
 871 gfc_interface_sym_mapping;
 872
 873
 874 /* This structure is used by callers to evaluate an expression from
 875    a callee's interface.  */
 876 typedef struct gfc_interface_mapping
 877 {
 878   /* Maps the interface's dummy arguments to the values that the caller
 879      is passing.  The whole list is owned by this gfc_interface_mapping.  */
 880   gfc_interface_sym_mapping *syms;
 881
 882   /* A list of gfc_charlens that were needed when creating copies of
 883      expressions.  The whole list is owned by this gfc_interface_mapping.  */
 884   gfc_charlen *charlens;
 885 }
 886 gfc_interface_mapping;
 887
 888 void gfc_init_interface_mapping (gfc_interface_mapping *);
 889 void gfc_free_interface_mapping (gfc_interface_mapping *);
 890 void gfc_add_interface_mapping (gfc_interface_mapping *,
 891                                 gfc_symbol *, gfc_se *, gfc_expr *);
 892 void gfc_finish_interface_mapping (gfc_interface_mapping *,
 893                                    stmtblock_t *, stmtblock_t *);
 894 void gfc_apply_interface_mapping (gfc_interface_mapping *,
 895                                   gfc_se *, gfc_expr *);
 896
 897
 898 /* Standard error messages used in all the trans-*.c files.  */
 899 extern const char gfc_msg_fault[];
 900 extern const char gfc_msg_wrong_return[];
 901
 902 #define OMPWS_WORKSHARE_FLAG    1       /* Set if in a workshare construct.  */
 903 #define OMPWS_CURR_SINGLEUNIT   2       /* Set if current gfc_code in workshare
 904                                            construct is not workshared.  */
 905 #define OMPWS_SCALARIZER_WS     4       /* Set if scalarizer should attempt
 906                                            to create parallel loops.  */
 907 #define OMPWS_NOWAIT            8       /* Use NOWAIT on OMP_FOR.  */
 908 extern int ompws_flags;
 909
 910 #endif /* GFC_TRANS_H */