gcc/fortran/trans.h

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