gcc/fortran/trans.h

   1 /* Header for code translation functions
   2    Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software
   3    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 2, 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 COPYING.  If not, write to the Free
  20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  21 02110-1301, USA.  */
  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   /* Ignore absent optional arguments.  Used for some intrinsics.  */
  69   unsigned ignore_optional:1;
  70
  71   /* When this is set the data and offset fields of the returned descriptor
  72      are NULL.  Used by intrinsic size.  */
  73   unsigned data_not_needed:1;
  74
  75   /* Scalarization parameters.  */
  76   struct gfc_se *parent;
  77   struct gfc_ss *ss;
  78   struct gfc_loopinfo *loop;
  79 }
  80 gfc_se;
  81
  82
  83 /* Scalarization State chain.  Created by walking an expression tree before
  84    creating the scalarization loops. Then passed as part of a gfc_se structure
  85    to translate the expression inside the loop.  Note that these chains are
  86    terminated by gfc_se_terminator, not NULL.  A NULL pointer in a gfc_se
  87    indicates to gfc_conv_* that this is a scalar expression.
  88    Note that some member arrays correspond to scalarizer rank and others
  89    are the variable rank.  */
  90
  91 typedef struct gfc_ss_info
  92 {
  93   int dimen;
  94   /* The ref that holds information on this section.  */
  95   gfc_ref *ref;
  96   /* The descriptor of this array.  */
  97   tree descriptor;
  98   /* holds the pointer to the data array.  */
  99   tree data;
 100   /* To move some of the array index calculation out of the innermost loop.  */
 101   tree offset;
 102   tree saved_offset;
 103   tree stride0;
 104   /* Holds the SS for a subscript.  Indexed by actual dimension.  */
 105   struct gfc_ss *subscript[GFC_MAX_DIMENSIONS];
 106
 107   /* stride and delta are used to access this inside a scalarization loop.
 108      start is used in the calculation of these.  Indexed by scalarizer
 109      dimension.  */
 110   tree start[GFC_MAX_DIMENSIONS];
 111   tree end[GFC_MAX_DIMENSIONS];
 112   tree stride[GFC_MAX_DIMENSIONS];
 113   tree delta[GFC_MAX_DIMENSIONS];
 114
 115   /* Translation from scalarizer dimensions to actual dimensions.
 116      actual = dim[scalarizer]  */
 117   int dim[GFC_MAX_DIMENSIONS];
 118 }
 119 gfc_ss_info;
 120
 121 typedef enum
 122 {
 123   /* A scalar value.  This will be evaluated before entering the
 124      scalarization loop.  */
 125   GFC_SS_SCALAR,
 126
 127   /* Like GFC_SS_SCALAR except it evaluates a pointer to the expression.
 128      Used for elemental function parameters.  */
 129   GFC_SS_REFERENCE,
 130
 131   /* An array section.  Scalarization indices will be substituted during
 132      expression translation.  */
 133   GFC_SS_SECTION,
 134
 135   /* A non-elemental function call returning an array.  The call is executed
 136      before entering the scalarization loop, storing the result in a
 137      temporary.  This temporary is then used inside the scalarization loop.
 138      Simple assignments, eg. a(:) = fn() are handles without a temporary
 139      as a special case.  */
 140   GFC_SS_FUNCTION,
 141
 142   /* An array constructor.  The current implementation is sub-optimal in
 143      many cases.  It allocated a temporary, assigns the values to it, then
 144      uses this temporary inside the scalarization loop.  */
 145   GFC_SS_CONSTRUCTOR,
 146
 147   /* A vector subscript.  The vector's descriptor is cached in the
 148      "descriptor" field of the associated gfc_ss_info.  */
 149   GFC_SS_VECTOR,
 150
 151   /* A temporary array allocated by the scalarizer.  Its rank can be less
 152      than that of the assignment expression.  */
 153   GFC_SS_TEMP,
 154
 155   /* An intrinsic function call.  Many intrinsic functions which map directly
 156      to library calls are created as GFC_SS_FUNCTION nodes.  */
 157   GFC_SS_INTRINSIC,
 158
 159   /* A component of a derived type.  */
 160   GFC_SS_COMPONENT
 161 }
 162 gfc_ss_type;
 163
 164 /* SS structures can only belong to a single loopinfo.  They must be added
 165    otherwise they will not get freed.  */
 166 typedef struct gfc_ss
 167 {
 168   gfc_ss_type type;
 169   gfc_expr *expr;
 170   mpz_t *shape;
 171   tree string_length;
 172   union
 173   {
 174     /* If type is GFC_SS_SCALAR or GFC_SS_REFERENCE.  */
 175     struct
 176     {
 177       tree expr;
 178     }
 179     scalar;
 180
 181     /* GFC_SS_TEMP.  */
 182     struct
 183     {
 184       /* The rank of the temporary.  May be less than the rank of the
 185          assigned expression.  */
 186       int dimen;
 187       tree type;
 188     }
 189     temp;
 190     /* All other types.  */
 191     gfc_ss_info info;
 192   }
 193   data;
 194
 195   /* All the SS in a loop and linked through loop_chain.  The SS for an
 196      expression are linked by the next pointer.  */
 197   struct gfc_ss *loop_chain;
 198   struct gfc_ss *next;
 199
 200   /* This is used by assignments requiring temporaries. The bits specify which
 201      loops the terms appear in.  This will be 1 for the RHS expressions,
 202      2 for the LHS expressions, and 3(=1|2) for the temporary.  */
 203   unsigned useflags:2;
 204 }
 205 gfc_ss;
 206 #define gfc_get_ss() gfc_getmem(sizeof(gfc_ss))
 207
 208 /* The contents of this aren't actually used.  A NULL SS chain indicates a
 209    scalar expression, so this pointer is used to terminate SS chains.  */
 210 extern gfc_ss * const gfc_ss_terminator;
 211
 212 /* Holds information about an expression while it is being scalarized.  */
 213 typedef struct gfc_loopinfo
 214 {
 215   stmtblock_t pre;
 216   stmtblock_t post;
 217
 218   int dimen;
 219
 220   /* All the SS involved with this loop.  */
 221   gfc_ss *ss;
 222   /* The SS describing the temporary used in an assignment.  */
 223   gfc_ss *temp_ss;
 224
 225   /* The scalarization loop index variables.  */
 226   tree loopvar[GFC_MAX_DIMENSIONS];
 227
 228   /* The bounds of the scalarization loops.  */
 229   tree from[GFC_MAX_DIMENSIONS];
 230   tree to[GFC_MAX_DIMENSIONS];
 231   gfc_ss *specloop[GFC_MAX_DIMENSIONS];
 232
 233   /* The code member contains the code for the body of the next outer loop.  */
 234   stmtblock_t code[GFC_MAX_DIMENSIONS];
 235
 236   /* Order in which the dimensions should be looped, innermost first.  */
 237   int order[GFC_MAX_DIMENSIONS];
 238
 239   /* The number of dimensions for which a temporary is used.  */
 240   int temp_dim;
 241
 242   /* If set we don't need the loop variables.  */
 243   unsigned array_parameter:1;
 244 }
 245 gfc_loopinfo;
 246
 247
 248 /* Information about a symbol that has been shadowed by a temporary.  */
 249 typedef struct
 250 {
 251   symbol_attribute attr;
 252   tree decl;
 253 }
 254 gfc_saved_var;
 255
 256
 257 /* Advance the SS chain to the next term.  */
 258 void gfc_advance_se_ss_chain (gfc_se *);
 259
 260 /* Call this to initialize a gfc_se structure before use
 261    first parameter is structure to initialize, second is
 262    parent to get scalarization data from, or NULL.  */
 263 void gfc_init_se (gfc_se *, gfc_se *);
 264
 265 /* Create an artificial variable decl and add it to the current scope.  */
 266 tree gfc_create_var (tree, const char *);
 267 /* Like above but doesn't add it to the current scope.  */
 268 tree gfc_create_var_np (tree, const char *);
 269
 270 /* Store the result of an expression in a temp variable so it can be used
 271    repeatedly even if the original changes */
 272 void gfc_make_safe_expr (gfc_se * se);
 273
 274 /* Makes sure se is suitable for passing as a function string parameter.  */
 275 void gfc_conv_string_parameter (gfc_se * se);
 276
 277 /* Compare two strings.  */
 278 tree gfc_build_compare_string (tree, tree, tree, tree);
 279
 280 /* Add an item to the end of TREE_LIST.  */
 281 tree gfc_chainon_list (tree, tree);
 282
 283 /* When using the gfc_conv_* make sure you understand what they do, i.e.
 284    when a POST chain may be created, and what the returned expression may be
 285    used for.  Note that character strings have special handling.  This
 286    should not be a problem as most statements/operations only deal with
 287    numeric/logical types.  See the implementations in trans-expr.c
 288    for details of the individual functions.  */
 289
 290 void gfc_conv_expr (gfc_se * se, gfc_expr * expr);
 291 void gfc_conv_expr_val (gfc_se * se, gfc_expr * expr);
 292 void gfc_conv_expr_lhs (gfc_se * se, gfc_expr * expr);
 293 void gfc_conv_expr_reference (gfc_se * se, gfc_expr *);
 294 void gfc_conv_expr_type (gfc_se * se, gfc_expr *, tree);
 295
 296 /* Find the decl containing the auxiliary variables for assigned variables.  */
 297 void gfc_conv_label_variable (gfc_se * se, gfc_expr * expr);
 298 /* If the value is not constant, Create a temporary and copy the value.  */
 299 tree gfc_evaluate_now (tree, stmtblock_t *);
 300
 301 /* Intrinsic function handling.  */
 302 void gfc_conv_intrinsic_function (gfc_se *, gfc_expr *);
 303
 304 /* Does an intrinsic map directly to an external library call.  */
 305 int gfc_is_intrinsic_libcall (gfc_expr *);
 306
 307 /* Used to call the elemental subroutines used in operator assignments.  */
 308 tree gfc_conv_operator_assign (gfc_se *, gfc_se *, gfc_symbol *);
 309
 310 /* Also used to CALL subroutines.  */
 311 int gfc_conv_function_call (gfc_se *, gfc_symbol *, gfc_actual_arglist *,
 312                             tree);
 313
 314 void gfc_conv_aliased_arg (gfc_se *, gfc_expr *, int, sym_intent);
 315 bool is_aliased_array (gfc_expr *);
 316
 317 /* gfc_trans_* shouldn't call push/poplevel, use gfc_push/pop_scope */
 318
 319 /* Generate code for a scalar assignment.  */
 320 tree gfc_trans_scalar_assign (gfc_se *, gfc_se *, gfc_typespec, bool, bool);
 321
 322 /* Translate COMMON blocks.  */
 323 void gfc_trans_common (gfc_namespace *);
 324
 325 /* Translate a derived type constructor.  */
 326 void gfc_conv_structure (gfc_se *, gfc_expr *, int);
 327
 328 /* Return an expression which determines if a dummy parameter is present.  */
 329 tree gfc_conv_expr_present (gfc_symbol *);
 330 /* Convert a missing, dummy argument into a null or zero.  */
 331 void gfc_conv_missing_dummy (gfc_se *, gfc_expr *, gfc_typespec);
 332
 333 /* Generate code to allocate a string temporary.  */
 334 tree gfc_conv_string_tmp (gfc_se *, tree, tree);
 335 /* Get the string length variable belonging to an expression.  */
 336 tree gfc_get_expr_charlen (gfc_expr *);
 337 /* Initialize a string length variable.  */
 338 void gfc_trans_init_string_length (gfc_charlen *, stmtblock_t *);
 339 /* Ensure type sizes can be gimplified.  */
 340 void gfc_trans_vla_type_sizes (gfc_symbol *, stmtblock_t *);
 341
 342 /* Add an expression to the end of a block.  */
 343 void gfc_add_expr_to_block (stmtblock_t *, tree);
 344 /* Add a block to the end of a block.  */
 345 void gfc_add_block_to_block (stmtblock_t *, stmtblock_t *);
 346 /* Add a MODIFY_EXPR or a GIMPLE_MODIFY_STMT to a block.  */
 347 void gfc_add_modify (stmtblock_t *, tree, tree, bool);
 348 #define gfc_add_modify_expr(BLOCK, LHS, RHS) \
 349        gfc_add_modify ((BLOCK), (LHS), (RHS), false)
 350 #define gfc_add_modify_stmt(BLOCK, LHS, RHS) \
 351        gfc_add_modify ((BLOCK), (LHS), (RHS), true)
 352
 353 /* Initialize a statement block.  */
 354 void gfc_init_block (stmtblock_t *);
 355 /* Start a new statement block.  Like gfc_init_block but also starts a new
 356    variable scope.  */
 357 void gfc_start_block (stmtblock_t *);
 358 /* Finish a statement block.  Also closes the scope if the block was created
 359    with gfc_start_block.  */
 360 tree gfc_finish_block (stmtblock_t *);
 361 /* Merge the scope of a block with its parent.  */
 362 void gfc_merge_block_scope (stmtblock_t * block);
 363
 364 /* Return the backend label decl.  */
 365 tree gfc_get_label_decl (gfc_st_label *);
 366
 367 /* Return the decl for an external function.  */
 368 tree gfc_get_extern_function_decl (gfc_symbol *);
 369
 370 /* Return the decl for a function.  */
 371 tree gfc_get_function_decl (gfc_symbol *);
 372
 373 /* Build an ADDR_EXPR.  */
 374 tree gfc_build_addr_expr (tree, tree);
 375
 376 /* Build an ARRAY_REF.  */
 377 tree gfc_build_array_ref (tree, tree);
 378
 379 /* Creates a label.  Decl is artificial if label_id == NULL_TREE.  */
 380 tree gfc_build_label_decl (tree);
 381
 382 /* Return the decl used to hold the function return value.
 383    Do not use if the function has an explicit result variable.  */
 384 tree gfc_get_fake_result_decl (gfc_symbol *, int);
 385
 386 /* Get the return label for the current function.  */
 387 tree gfc_get_return_label (void);
 388
 389 /* Add a decl to the binding level for the current function.  */
 390 void gfc_add_decl_to_function (tree);
 391
 392 /* Make prototypes for runtime library functions.  */
 393 void gfc_build_builtin_function_decls (void);
 394
 395 /* Set the backend source location of a decl.  */
 396 void gfc_set_decl_location (tree, locus *);
 397
 398 /* Return the variable decl for a symbol.  */
 399 tree gfc_get_symbol_decl (gfc_symbol *);
 400
 401 /* Build a static initializer.  */
 402 tree gfc_conv_initializer (gfc_expr *, gfc_typespec *, tree, bool, bool);
 403
 404 /* Substitute a temporary variable in place of the real one.  */
 405 void gfc_shadow_sym (gfc_symbol *, tree, gfc_saved_var *);
 406
 407 /* Restore the original variable.  */
 408 void gfc_restore_sym (gfc_symbol *, gfc_saved_var *);
 409
 410 /* Returns true if a variable of specified size should go on the stack.  */
 411 int gfc_can_put_var_on_stack (tree);
 412
 413 /* Allocate the lang-specific part of a decl node.  */
 414 void gfc_allocate_lang_decl (tree);
 415
 416 /* Advance along a TREE_CHAIN.  */
 417 tree gfc_advance_chain (tree, int);
 418
 419 /* Create a decl for a function.  */
 420 void gfc_create_function_decl (gfc_namespace *);
 421 /* Generate the code for a function.  */
 422 void gfc_generate_function_code (gfc_namespace *);
 423 /* Output a BLOCK DATA program unit.  */
 424 void gfc_generate_block_data (gfc_namespace *);
 425 /* Output a decl for a module variable.  */
 426 void gfc_generate_module_vars (gfc_namespace *);
 427
 428 /* Get and set the current location.  */
 429 void gfc_set_backend_locus (locus *);
 430 void gfc_get_backend_locus (locus *);
 431
 432 /* Handle static constructor functions.  */
 433 extern GTY(()) tree gfc_static_ctors;
 434 void gfc_generate_constructors (void);
 435
 436 /* Get the string length of an array constructor.  */
 437 bool get_array_ctor_strlen (gfc_constructor *, tree *);
 438
 439 /* Generate a runtime error check.  */
 440 void gfc_trans_runtime_check (tree, const char *, stmtblock_t *, locus *);
 441
 442 /* Generate code for an assignment, includes scalarization.  */
 443 tree gfc_trans_assignment (gfc_expr *, gfc_expr *, bool);
 444
 445 /* Generate code for a pointer assignment.  */
 446 tree gfc_trans_pointer_assignment (gfc_expr *, gfc_expr *);
 447
 448 /* Initialize function decls for library functions.  */
 449 void gfc_build_intrinsic_lib_fndecls (void);
 450 /* Create function decls for IO library functions.  */
 451 void gfc_build_io_library_fndecls (void);
 452 /* Build a function decl for a library function.  */
 453 tree gfc_build_library_function_decl (tree, tree, int, ...);
 454
 455 /* somewhere! */
 456 tree pushdecl (tree);
 457 tree pushdecl_top_level (tree);
 458 void pushlevel (int);
 459 tree poplevel (int, int, int);
 460 tree getdecls (void);
 461 tree gfc_truthvalue_conversion (tree);
 462 tree gfc_builtin_function (tree);
 463
 464 /* In trans-openmp.c */
 465 bool gfc_omp_privatize_by_reference (tree);
 466 enum omp_clause_default_kind gfc_omp_predetermined_sharing (tree);
 467 tree gfc_omp_clause_default_ctor (tree, tree);
 468 bool gfc_omp_disregard_value_expr (tree, bool);
 469 bool gfc_omp_private_debug_clause (tree, bool);
 470 struct gimplify_omp_ctx;
 471 void gfc_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *, tree);
 472
 473 /* Runtime library function decls.  */
 474 extern GTY(()) tree gfor_fndecl_internal_malloc;
 475 extern GTY(()) tree gfor_fndecl_internal_malloc64;
 476 extern GTY(()) tree gfor_fndecl_internal_realloc;
 477 extern GTY(()) tree gfor_fndecl_internal_realloc64;
 478 extern GTY(()) tree gfor_fndecl_internal_free;
 479 extern GTY(()) tree gfor_fndecl_allocate;
 480 extern GTY(()) tree gfor_fndecl_allocate64;
 481 extern GTY(()) tree gfor_fndecl_allocate_array;
 482 extern GTY(()) tree gfor_fndecl_allocate64_array;
 483 extern GTY(()) tree gfor_fndecl_deallocate;
 484 extern GTY(()) tree gfor_fndecl_pause_numeric;
 485 extern GTY(()) tree gfor_fndecl_pause_string;
 486 extern GTY(()) tree gfor_fndecl_stop_numeric;
 487 extern GTY(()) tree gfor_fndecl_stop_string;
 488 extern GTY(()) tree gfor_fndecl_select_string;
 489 extern GTY(()) tree gfor_fndecl_runtime_error;
 490 extern GTY(()) tree gfor_fndecl_set_fpe;
 491 extern GTY(()) tree gfor_fndecl_set_std;
 492 extern GTY(()) tree gfor_fndecl_ttynam;
 493 extern GTY(()) tree gfor_fndecl_ctime;
 494 extern GTY(()) tree gfor_fndecl_fdate;
 495 extern GTY(()) tree gfor_fndecl_in_pack;
 496 extern GTY(()) tree gfor_fndecl_in_unpack;
 497 extern GTY(()) tree gfor_fndecl_associated;
 498
 499 /* Math functions.  Many other math functions are handled in
 500    trans-intrinsic.c.  */
 501
 502 typedef struct gfc_powdecl_list GTY(())
 503 {
 504   tree integer;
 505   tree real;
 506   tree cmplx;
 507 }
 508 gfc_powdecl_list;
 509
 510 extern GTY(()) gfc_powdecl_list gfor_fndecl_math_powi[4][3];
 511 extern GTY(()) tree gfor_fndecl_math_cpowf;
 512 extern GTY(()) tree gfor_fndecl_math_cpow;
 513 extern GTY(()) tree gfor_fndecl_math_cpowl10;
 514 extern GTY(()) tree gfor_fndecl_math_cpowl16;
 515 extern GTY(()) tree gfor_fndecl_math_ishftc4;
 516 extern GTY(()) tree gfor_fndecl_math_ishftc8;
 517 extern GTY(()) tree gfor_fndecl_math_ishftc16;
 518 extern GTY(()) tree gfor_fndecl_math_exponent4;
 519 extern GTY(()) tree gfor_fndecl_math_exponent8;
 520 extern GTY(()) tree gfor_fndecl_math_exponent10;
 521 extern GTY(()) tree gfor_fndecl_math_exponent16;
 522
 523 /* BLAS functions.  */
 524 extern GTY(()) tree gfor_fndecl_sgemm;
 525 extern GTY(()) tree gfor_fndecl_dgemm;
 526 extern GTY(()) tree gfor_fndecl_cgemm;
 527 extern GTY(()) tree gfor_fndecl_zgemm;
 528
 529 /* String functions.  */
 530 extern GTY(()) tree gfor_fndecl_compare_string;
 531 extern GTY(()) tree gfor_fndecl_concat_string;
 532 extern GTY(()) tree gfor_fndecl_string_len_trim;
 533 extern GTY(()) tree gfor_fndecl_string_index;
 534 extern GTY(()) tree gfor_fndecl_string_scan;
 535 extern GTY(()) tree gfor_fndecl_string_verify;
 536 extern GTY(()) tree gfor_fndecl_string_trim;
 537 extern GTY(()) tree gfor_fndecl_adjustl;
 538 extern GTY(()) tree gfor_fndecl_adjustr;
 539
 540 /* Other misc. runtime library functions.  */
 541 extern GTY(()) tree gfor_fndecl_size0;
 542 extern GTY(()) tree gfor_fndecl_size1;
 543 extern GTY(()) tree gfor_fndecl_iargc;
 544
 545 /* Implemented in FORTRAN.  */
 546 extern GTY(()) tree gfor_fndecl_si_kind;
 547 extern GTY(()) tree gfor_fndecl_sr_kind;
 548
 549
 550 /* True if node is an integer constant.  */
 551 #define INTEGER_CST_P(node) (TREE_CODE(node) == INTEGER_CST)
 552
 553 /* G95-specific declaration information.  */
 554
 555 /* Array types only.  */
 556 struct lang_type                GTY(())
 557 {
 558   int rank;
 559   tree lbound[GFC_MAX_DIMENSIONS];
 560   tree ubound[GFC_MAX_DIMENSIONS];
 561   tree stride[GFC_MAX_DIMENSIONS];
 562   tree size;
 563   tree offset;
 564   tree dtype;
 565   tree dataptr_type;
 566 };
 567
 568 struct lang_decl                GTY(())
 569 {
 570   /* Dummy variables.  */
 571   tree saved_descriptor;
 572   /* Assigned integer nodes.  Stringlength is the IO format string's length.
 573      Addr is the address of the string or the target label. Stringlength is
 574      initialized to -2 and assigned to -1 when addr is assigned to the
 575      address of target label.  */
 576   tree stringlen;
 577   tree addr;
 578 };
 579
 580
 581 #define GFC_DECL_ASSIGN_ADDR(node) DECL_LANG_SPECIFIC(node)->addr
 582 #define GFC_DECL_STRING_LEN(node) DECL_LANG_SPECIFIC(node)->stringlen
 583 #define GFC_DECL_SAVED_DESCRIPTOR(node) \
 584   (DECL_LANG_SPECIFIC(node)->saved_descriptor)
 585 #define GFC_DECL_PACKED_ARRAY(node) DECL_LANG_FLAG_0(node)
 586 #define GFC_DECL_PARTIAL_PACKED_ARRAY(node) DECL_LANG_FLAG_1(node)
 587 #define GFC_DECL_ASSIGN(node) DECL_LANG_FLAG_2(node)
 588 #define GFC_DECL_COMMON_OR_EQUIV(node) DECL_LANG_FLAG_3(node)
 589 #define GFC_DECL_CRAY_POINTEE(node) DECL_LANG_FLAG_4(node)
 590 #define GFC_DECL_RESULT(node) DECL_LANG_FLAG_5(node)
 591
 592 /* An array descriptor.  */
 593 #define GFC_DESCRIPTOR_TYPE_P(node) TYPE_LANG_FLAG_1(node)
 594 /* An array without a descriptor.  */
 595 #define GFC_ARRAY_TYPE_P(node) TYPE_LANG_FLAG_2(node)
 596 /* The GFC_TYPE_ARRAY_* members are present in both descriptor and
 597    descriptorless array types.  */
 598 #define GFC_TYPE_ARRAY_LBOUND(node, dim) \
 599   (TYPE_LANG_SPECIFIC(node)->lbound[dim])
 600 #define GFC_TYPE_ARRAY_UBOUND(node, dim) \
 601   (TYPE_LANG_SPECIFIC(node)->ubound[dim])
 602 #define GFC_TYPE_ARRAY_STRIDE(node, dim) \
 603   (TYPE_LANG_SPECIFIC(node)->stride[dim])
 604 #define GFC_TYPE_ARRAY_RANK(node) (TYPE_LANG_SPECIFIC(node)->rank)
 605 #define GFC_TYPE_ARRAY_SIZE(node) (TYPE_LANG_SPECIFIC(node)->size)
 606 #define GFC_TYPE_ARRAY_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->offset)
 607 /* Code should use gfc_get_dtype instead of accesig this directly.  It may
 608    not be known when the type is created.  */
 609 #define GFC_TYPE_ARRAY_DTYPE(node) (TYPE_LANG_SPECIFIC(node)->dtype)
 610 #define GFC_TYPE_ARRAY_DATAPTR_TYPE(node) \
 611   (TYPE_LANG_SPECIFIC(node)->dataptr_type)
 612
 613 /* I changed this from sorry(...) because it should not return.  */
 614 /* TODO: Remove gfc_todo_error before releasing version 1.0.  */
 615 #define gfc_todo_error(args...) fatal_error("gfc_todo: Not Implemented: " args)
 616
 617 /* Build an expression with void type.  */
 618 #define build1_v(code, arg) build1(code, void_type_node, arg)
 619 #define build2_v(code, arg1, arg2) build2(code, void_type_node, \
 620                                           arg1, arg2)
 621 #define build3_v(code, arg1, arg2, arg3) build3(code, void_type_node, \
 622                                                 arg1, arg2, arg3)
 623 #define build4_v(code, arg1, arg2, arg3, arg4) build4(code, void_type_node, \
 624                                                       arg1, arg2, arg3, arg4)
 625
 626 /* This group of functions allows a caller to evaluate an expression from
 627    the callee's interface.  It establishes a mapping between the interface's
 628    dummy arguments and the caller's actual arguments, then applies that
 629    mapping to a given gfc_expr.
 630
 631    You can initialize a mapping structure like so:
 632
 633        gfc_interface_mapping mapping;
 634        ...
 635        gfc_init_interface_mapping (&mapping);
 636
 637    You should then evaluate each actual argument into a temporary
 638    gfc_se structure, here called "se", and map the result to the
 639    dummy argument's symbol, here called "sym":
 640
 641        gfc_add_interface_mapping (&mapping, sym, &se);
 642
 643    After adding all mappings, you should call:
 644
 645        gfc_finish_interface_mapping (&mapping, pre, post);
 646
 647    where "pre" and "post" are statement blocks for initialization
 648    and finalization code respectively.  You can then evaluate an
 649    interface expression "expr" as follows:
 650
 651        gfc_apply_interface_mapping (&mapping, se, expr);
 652
 653    Once you've evaluated all expressions, you should free
 654    the mapping structure with:
 655
 656        gfc_free_interface_mapping (&mapping); */
 657
 658
 659 /* This structure represents a mapping from OLD to NEW, where OLD is a
 660    dummy argument symbol and NEW is a symbol that represents the value
 661    of an actual argument.  Mappings are linked together using NEXT
 662    (in no particular order).  */
 663 typedef struct gfc_interface_sym_mapping
 664 {
 665   struct gfc_interface_sym_mapping *next;
 666   gfc_symbol *old;
 667   gfc_symtree *new;
 668 }
 669 gfc_interface_sym_mapping;
 670
 671
 672 /* This structure is used by callers to evaluate an expression from
 673    a callee's interface.  */
 674 typedef struct gfc_interface_mapping
 675 {
 676   /* Maps the interface's dummy arguments to the values that the caller
 677      is passing.  The whole list is owned by this gfc_interface_mapping.  */
 678   gfc_interface_sym_mapping *syms;
 679
 680   /* A list of gfc_charlens that were needed when creating copies of
 681      expressions.  The whole list is owned by this gfc_interface_mapping.  */
 682   gfc_charlen *charlens;
 683 }
 684 gfc_interface_mapping;
 685
 686 void gfc_init_interface_mapping (gfc_interface_mapping *);
 687 void gfc_free_interface_mapping (gfc_interface_mapping *);
 688 void gfc_add_interface_mapping (gfc_interface_mapping *,
 689                                 gfc_symbol *, gfc_se *);
 690 void gfc_finish_interface_mapping (gfc_interface_mapping *,
 691                                    stmtblock_t *, stmtblock_t *);
 692 void gfc_apply_interface_mapping (gfc_interface_mapping *,
 693                                   gfc_se *, gfc_expr *);
 694
 695
 696 /* Standard error messages used in all the trans-*.c files.  */
 697 extern char gfc_msg_bounds[];
 698 extern char gfc_msg_fault[];
 699 extern char gfc_msg_wrong_return[];
 700
 701
 702 #endif /* GFC_TRANS_H */