gcc/fortran/trans-io.c

   1 /* IO Code translation/library interface
   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, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "tree.h"
  27 #include "tree-gimple.h"
  28 #include "ggc.h"
  29 #include "toplev.h"
  30 #include "real.h"
  31 #include "gfortran.h"
  32 #include "trans.h"
  33 #include "trans-stmt.h"
  34 #include "trans-array.h"
  35 #include "trans-types.h"
  36 #include "trans-const.h"
  37
  38
  39 /* Members of the ioparm structure.  */
  40
  41 static GTY(()) tree ioparm_unit;
  42 static GTY(()) tree ioparm_err;
  43 static GTY(()) tree ioparm_end;
  44 static GTY(()) tree ioparm_eor;
  45 static GTY(()) tree ioparm_list_format;
  46 static GTY(()) tree ioparm_library_return;
  47 static GTY(()) tree ioparm_iostat;
  48 static GTY(()) tree ioparm_exist;
  49 static GTY(()) tree ioparm_opened;
  50 static GTY(()) tree ioparm_number;
  51 static GTY(()) tree ioparm_named;
  52 static GTY(()) tree ioparm_rec;
  53 static GTY(()) tree ioparm_nextrec;
  54 static GTY(()) tree ioparm_size;
  55 static GTY(()) tree ioparm_recl_in;
  56 static GTY(()) tree ioparm_recl_out;
  57 static GTY(()) tree ioparm_iolength;
  58 static GTY(()) tree ioparm_file;
  59 static GTY(()) tree ioparm_file_len;
  60 static GTY(()) tree ioparm_status;
  61 static GTY(()) tree ioparm_status_len;
  62 static GTY(()) tree ioparm_access;
  63 static GTY(()) tree ioparm_access_len;
  64 static GTY(()) tree ioparm_form;
  65 static GTY(()) tree ioparm_form_len;
  66 static GTY(()) tree ioparm_blank;
  67 static GTY(()) tree ioparm_blank_len;
  68 static GTY(()) tree ioparm_position;
  69 static GTY(()) tree ioparm_position_len;
  70 static GTY(()) tree ioparm_action;
  71 static GTY(()) tree ioparm_action_len;
  72 static GTY(()) tree ioparm_delim;
  73 static GTY(()) tree ioparm_delim_len;
  74 static GTY(()) tree ioparm_pad;
  75 static GTY(()) tree ioparm_pad_len;
  76 static GTY(()) tree ioparm_format;
  77 static GTY(()) tree ioparm_format_len;
  78 static GTY(()) tree ioparm_advance;
  79 static GTY(()) tree ioparm_advance_len;
  80 static GTY(()) tree ioparm_name;
  81 static GTY(()) tree ioparm_name_len;
  82 static GTY(()) tree ioparm_internal_unit;
  83 static GTY(()) tree ioparm_internal_unit_len;
  84 static GTY(()) tree ioparm_sequential;
  85 static GTY(()) tree ioparm_sequential_len;
  86 static GTY(()) tree ioparm_direct;
  87 static GTY(()) tree ioparm_direct_len;
  88 static GTY(()) tree ioparm_formatted;
  89 static GTY(()) tree ioparm_formatted_len;
  90 static GTY(()) tree ioparm_unformatted;
  91 static GTY(()) tree ioparm_unformatted_len;
  92 static GTY(()) tree ioparm_read;
  93 static GTY(()) tree ioparm_read_len;
  94 static GTY(()) tree ioparm_write;
  95 static GTY(()) tree ioparm_write_len;
  96 static GTY(()) tree ioparm_readwrite;
  97 static GTY(()) tree ioparm_readwrite_len;
  98 static GTY(()) tree ioparm_namelist_name;
  99 static GTY(()) tree ioparm_namelist_name_len;
 100 static GTY(()) tree ioparm_namelist_read_mode;
 101
 102 /* The global I/O variables */
 103
 104 static GTY(()) tree ioparm_var;
 105 static GTY(()) tree locus_file;
 106 static GTY(()) tree locus_line;
 107
 108
 109 /* Library I/O subroutines */
 110
 111 static GTY(()) tree iocall_read;
 112 static GTY(()) tree iocall_read_done;
 113 static GTY(()) tree iocall_write;
 114 static GTY(()) tree iocall_write_done;
 115 static GTY(()) tree iocall_x_integer;
 116 static GTY(()) tree iocall_x_logical;
 117 static GTY(()) tree iocall_x_character;
 118 static GTY(()) tree iocall_x_real;
 119 static GTY(()) tree iocall_x_complex;
 120 static GTY(()) tree iocall_open;
 121 static GTY(()) tree iocall_close;
 122 static GTY(()) tree iocall_inquire;
 123 static GTY(()) tree iocall_iolength;
 124 static GTY(()) tree iocall_iolength_done;
 125 static GTY(()) tree iocall_rewind;
 126 static GTY(()) tree iocall_backspace;
 127 static GTY(()) tree iocall_endfile;
 128 static GTY(()) tree iocall_set_nml_val_int;
 129 static GTY(()) tree iocall_set_nml_val_float;
 130 static GTY(()) tree iocall_set_nml_val_char;
 131 static GTY(()) tree iocall_set_nml_val_complex;
 132 static GTY(()) tree iocall_set_nml_val_log;
 133
 134 /* Variable for keeping track of what the last data transfer statement
 135    was.  Used for deciding which subroutine to call when the data
 136    transfer is complete.  */
 137 static enum { READ, WRITE, IOLENGTH } last_dt;
 138
 139 #define ADD_FIELD(name, type)                                           \
 140   ioparm_ ## name = gfc_add_field_to_struct                             \
 141         (&(TYPE_FIELDS (ioparm_type)), ioparm_type,                     \
 142          get_identifier (stringize(name)), type)
 143
 144 #define ADD_STRING(name) \
 145   ioparm_ ## name = gfc_add_field_to_struct                             \
 146         (&(TYPE_FIELDS (ioparm_type)), ioparm_type,                     \
 147          get_identifier (stringize(name)), pchar_type_node);            \
 148   ioparm_ ## name ## _len = gfc_add_field_to_struct                     \
 149         (&(TYPE_FIELDS (ioparm_type)), ioparm_type,                     \
 150          get_identifier (stringize(name) "_len"), gfc_charlen_type_node)
 151
 152
 153 /* Create function decls for IO library functions.  */
 154
 155 void
 156 gfc_build_io_library_fndecls (void)
 157 {
 158   tree gfc_int4_type_node;
 159   tree gfc_pint4_type_node;
 160   tree ioparm_type;
 161
 162   gfc_int4_type_node = gfc_get_int_type (4);
 163   gfc_pint4_type_node = build_pointer_type (gfc_int4_type_node);
 164
 165   /* Build the st_parameter structure.  Information associated with I/O
 166      calls are transferred here.  This must match the one defined in the
 167      library exactly.  */
 168
 169   ioparm_type = make_node (RECORD_TYPE);
 170   TYPE_NAME (ioparm_type) = get_identifier ("_gfc_ioparm");
 171
 172   ADD_FIELD (unit, gfc_int4_type_node);
 173   ADD_FIELD (err, gfc_int4_type_node);
 174   ADD_FIELD (end, gfc_int4_type_node);
 175   ADD_FIELD (eor, gfc_int4_type_node);
 176   ADD_FIELD (list_format, gfc_int4_type_node);
 177   ADD_FIELD (library_return, gfc_int4_type_node);
 178
 179   ADD_FIELD (iostat, gfc_pint4_type_node);
 180   ADD_FIELD (exist, gfc_pint4_type_node);
 181   ADD_FIELD (opened, gfc_pint4_type_node);
 182   ADD_FIELD (number, gfc_pint4_type_node);
 183   ADD_FIELD (named, gfc_pint4_type_node);
 184   ADD_FIELD (rec, gfc_int4_type_node);
 185   ADD_FIELD (nextrec, gfc_pint4_type_node);
 186   ADD_FIELD (size, gfc_pint4_type_node);
 187
 188   ADD_FIELD (recl_in, gfc_int4_type_node);
 189   ADD_FIELD (recl_out, gfc_pint4_type_node);
 190
 191   ADD_FIELD (iolength, gfc_pint4_type_node);
 192
 193   ADD_STRING (file);
 194   ADD_STRING (status);
 195
 196   ADD_STRING (access);
 197   ADD_STRING (form);
 198   ADD_STRING (blank);
 199   ADD_STRING (position);
 200   ADD_STRING (action);
 201   ADD_STRING (delim);
 202   ADD_STRING (pad);
 203   ADD_STRING (format);
 204   ADD_STRING (advance);
 205   ADD_STRING (name);
 206   ADD_STRING (internal_unit);
 207   ADD_STRING (sequential);
 208
 209   ADD_STRING (direct);
 210   ADD_STRING (formatted);
 211   ADD_STRING (unformatted);
 212   ADD_STRING (read);
 213   ADD_STRING (write);
 214   ADD_STRING (readwrite);
 215
 216   ADD_STRING (namelist_name);
 217   ADD_FIELD (namelist_read_mode, gfc_int4_type_node);
 218
 219   gfc_finish_type (ioparm_type);
 220
 221   ioparm_var = build_decl (VAR_DECL, get_identifier (PREFIX("ioparm")),
 222                            ioparm_type);
 223   DECL_EXTERNAL (ioparm_var) = 1;
 224   TREE_PUBLIC (ioparm_var) = 1;
 225
 226   locus_line = build_decl (VAR_DECL, get_identifier (PREFIX("line")),
 227                            gfc_int4_type_node);
 228   DECL_EXTERNAL (locus_line) = 1;
 229   TREE_PUBLIC (locus_line) = 1;
 230
 231   locus_file = build_decl (VAR_DECL, get_identifier (PREFIX("filename")),
 232                            pchar_type_node);
 233   DECL_EXTERNAL (locus_file) = 1;
 234   TREE_PUBLIC (locus_file) = 1;
 235
 236   /* Define the transfer functions.  */
 237
 238   iocall_x_integer =
 239     gfc_build_library_function_decl (get_identifier
 240                                      (PREFIX("transfer_integer")),
 241                                      void_type_node, 2, pvoid_type_node,
 242                                      gfc_int4_type_node);
 243
 244   iocall_x_logical =
 245     gfc_build_library_function_decl (get_identifier
 246                                      (PREFIX("transfer_logical")),
 247                                      void_type_node, 2, pvoid_type_node,
 248                                      gfc_int4_type_node);
 249
 250   iocall_x_character =
 251     gfc_build_library_function_decl (get_identifier
 252                                      (PREFIX("transfer_character")),
 253                                      void_type_node, 2, pvoid_type_node,
 254                                      gfc_int4_type_node);
 255
 256   iocall_x_real =
 257     gfc_build_library_function_decl (get_identifier (PREFIX("transfer_real")),
 258                                      void_type_node, 2,
 259                                      pvoid_type_node, gfc_int4_type_node);
 260
 261   iocall_x_complex =
 262     gfc_build_library_function_decl (get_identifier
 263                                      (PREFIX("transfer_complex")),
 264                                      void_type_node, 2, pvoid_type_node,
 265                                      gfc_int4_type_node);
 266
 267   /* Library entry points */
 268
 269   iocall_read =
 270     gfc_build_library_function_decl (get_identifier (PREFIX("st_read")),
 271                                      void_type_node, 0);
 272
 273   iocall_write =
 274     gfc_build_library_function_decl (get_identifier (PREFIX("st_write")),
 275                                      void_type_node, 0);
 276   iocall_open =
 277     gfc_build_library_function_decl (get_identifier (PREFIX("st_open")),
 278                                      void_type_node, 0);
 279
 280   iocall_close =
 281     gfc_build_library_function_decl (get_identifier (PREFIX("st_close")),
 282                                      void_type_node, 0);
 283
 284   iocall_inquire =
 285     gfc_build_library_function_decl (get_identifier (PREFIX("st_inquire")),
 286                                      gfc_int4_type_node, 0);
 287
 288   iocall_iolength =
 289     gfc_build_library_function_decl(get_identifier (PREFIX("st_iolength")),
 290                                     void_type_node, 0);
 291
 292   iocall_rewind =
 293     gfc_build_library_function_decl (get_identifier (PREFIX("st_rewind")),
 294                                      gfc_int4_type_node, 0);
 295
 296   iocall_backspace =
 297     gfc_build_library_function_decl (get_identifier (PREFIX("st_backspace")),
 298                                      gfc_int4_type_node, 0);
 299
 300   iocall_endfile =
 301     gfc_build_library_function_decl (get_identifier (PREFIX("st_endfile")),
 302                                      gfc_int4_type_node, 0);
 303   /* Library helpers */
 304
 305   iocall_read_done =
 306     gfc_build_library_function_decl (get_identifier (PREFIX("st_read_done")),
 307                                      gfc_int4_type_node, 0);
 308
 309   iocall_write_done =
 310     gfc_build_library_function_decl (get_identifier (PREFIX("st_write_done")),
 311                                      gfc_int4_type_node, 0);
 312
 313   iocall_iolength_done =
 314     gfc_build_library_function_decl (get_identifier (PREFIX("st_iolength_done")),
 315                                      gfc_int4_type_node, 0);
 316
 317   iocall_set_nml_val_int =
 318     gfc_build_library_function_decl (get_identifier (PREFIX("st_set_nml_var_int")),
 319                                      void_type_node, 4,
 320                                      pvoid_type_node, pvoid_type_node,
 321                                      gfc_int4_type_node,gfc_int4_type_node);
 322
 323   iocall_set_nml_val_float =
 324     gfc_build_library_function_decl (get_identifier (PREFIX("st_set_nml_var_float")),
 325                                      void_type_node, 4,
 326                                      pvoid_type_node, pvoid_type_node,
 327                                      gfc_int4_type_node,gfc_int4_type_node);
 328   iocall_set_nml_val_char =
 329     gfc_build_library_function_decl (get_identifier (PREFIX("st_set_nml_var_char")),
 330                                      void_type_node, 5,
 331                                      pvoid_type_node, pvoid_type_node,
 332                                      gfc_int4_type_node, gfc_int4_type_node,
 333                                      gfc_charlen_type_node);
 334   iocall_set_nml_val_complex =
 335     gfc_build_library_function_decl (get_identifier (PREFIX("st_set_nml_var_complex")),
 336                                      void_type_node, 4,
 337                                      pvoid_type_node, pvoid_type_node,
 338                                      gfc_int4_type_node,gfc_int4_type_node);
 339   iocall_set_nml_val_log =
 340     gfc_build_library_function_decl (get_identifier (PREFIX("st_set_nml_var_log")),
 341                                      void_type_node, 4,
 342                                      pvoid_type_node, pvoid_type_node,
 343                                      gfc_int4_type_node,gfc_int4_type_node);
 344
 345 }
 346
 347
 348 /* Generate code to store an non-string I/O parameter into the
 349    ioparm structure.  This is a pass by value.  */
 350
 351 static void
 352 set_parameter_value (stmtblock_t * block, tree var, gfc_expr * e)
 353 {
 354   gfc_se se;
 355   tree tmp;
 356
 357   gfc_init_se (&se, NULL);
 358   gfc_conv_expr_type (&se, e, TREE_TYPE (var));
 359   gfc_add_block_to_block (block, &se.pre);
 360
 361   tmp = build3 (COMPONENT_REF, TREE_TYPE (var), ioparm_var, var, NULL_TREE);
 362   gfc_add_modify_expr (block, tmp, se.expr);
 363 }
 364
 365
 366 /* Generate code to store an non-string I/O parameter into the
 367    ioparm structure.  This is pass by reference.  */
 368
 369 static void
 370 set_parameter_ref (stmtblock_t * block, tree var, gfc_expr * e)
 371 {
 372   gfc_se se;
 373   tree tmp;
 374
 375   gfc_init_se (&se, NULL);
 376   se.want_pointer = 1;
 377
 378   gfc_conv_expr_type (&se, e, TREE_TYPE (var));
 379   gfc_add_block_to_block (block, &se.pre);
 380
 381   tmp = build3 (COMPONENT_REF, TREE_TYPE (var), ioparm_var, var, NULL_TREE);
 382   gfc_add_modify_expr (block, tmp, se.expr);
 383 }
 384
 385
 386 /* Generate code to store a string and its length into the
 387    ioparm structure.  */
 388
 389 static void
 390 set_string (stmtblock_t * block, stmtblock_t * postblock, tree var,
 391             tree var_len, gfc_expr * e)
 392 {
 393   gfc_se se;
 394   tree tmp;
 395   tree msg;
 396   tree io;
 397   tree len;
 398
 399   gfc_init_se (&se, NULL);
 400   gfc_conv_expr (&se, e);
 401
 402   io = build3 (COMPONENT_REF, TREE_TYPE (var), ioparm_var, var, NULL_TREE);
 403   len = build3 (COMPONENT_REF, TREE_TYPE (var_len), ioparm_var, var_len,
 404                 NULL_TREE);
 405
 406   /* Integer variable assigned a format label.  */
 407   if (e->ts.type == BT_INTEGER && e->symtree->n.sym->attr.assign == 1)
 408     {
 409       msg =
 410         gfc_build_cstring_const ("Assigned label is not a format label");
 411       tmp = GFC_DECL_STRING_LEN (se.expr);
 412       tmp = build2 (LE_EXPR, boolean_type_node,
 413                     tmp, convert (TREE_TYPE (tmp), integer_minus_one_node));
 414       gfc_trans_runtime_check (tmp, msg, &se.pre);
 415       gfc_add_modify_expr (&se.pre, io, GFC_DECL_ASSIGN_ADDR (se.expr));
 416       gfc_add_modify_expr (&se.pre, len, GFC_DECL_STRING_LEN (se.expr));
 417     }
 418   else
 419     {
 420       gfc_conv_string_parameter (&se);
 421       gfc_add_modify_expr (&se.pre, io, fold_convert (TREE_TYPE (io), se.expr));
 422       gfc_add_modify_expr (&se.pre, len, se.string_length);
 423     }
 424
 425   gfc_add_block_to_block (block, &se.pre);
 426   gfc_add_block_to_block (postblock, &se.post);
 427
 428 }
 429
 430
 431 /* Set a member of the ioparm structure to one.  */
 432 static void
 433 set_flag (stmtblock_t *block, tree var)
 434 {
 435   tree tmp, type = TREE_TYPE (var);
 436
 437   tmp = build3 (COMPONENT_REF, type, ioparm_var, var, NULL_TREE);
 438   gfc_add_modify_expr (block, tmp, convert (type, integer_one_node));
 439 }
 440
 441
 442 /* Add a case to a IO-result switch.  */
 443
 444 static void
 445 add_case (int label_value, gfc_st_label * label, stmtblock_t * body)
 446 {
 447   tree tmp, value;
 448
 449   if (label == NULL)
 450     return;                     /* No label, no case */
 451
 452   value = build_int_cst (NULL_TREE, label_value);
 453
 454   /* Make a backend label for this case.  */
 455   tmp = gfc_build_label_decl (NULL_TREE);
 456
 457   /* And the case itself.  */
 458   tmp = build3_v (CASE_LABEL_EXPR, value, NULL_TREE, tmp);
 459   gfc_add_expr_to_block (body, tmp);
 460
 461   /* Jump to the label.  */
 462   tmp = build1_v (GOTO_EXPR, gfc_get_label_decl (label));
 463   gfc_add_expr_to_block (body, tmp);
 464 }
 465
 466
 467 /* Generate a switch statement that branches to the correct I/O
 468    result label.  The last statement of an I/O call stores the
 469    result into a variable because there is often cleanup that
 470    must be done before the switch, so a temporary would have to
 471    be created anyway.  */
 472
 473 static void
 474 io_result (stmtblock_t * block, gfc_st_label * err_label,
 475            gfc_st_label * end_label, gfc_st_label * eor_label)
 476 {
 477   stmtblock_t body;
 478   tree tmp, rc;
 479
 480   /* If no labels are specified, ignore the result instead
 481      of building an empty switch.  */
 482   if (err_label == NULL
 483       && end_label == NULL
 484       && eor_label == NULL)
 485     return;
 486
 487   /* Build a switch statement.  */
 488   gfc_start_block (&body);
 489
 490   /* The label values here must be the same as the values
 491      in the library_return enum in the runtime library */
 492   add_case (1, err_label, &body);
 493   add_case (2, end_label, &body);
 494   add_case (3, eor_label, &body);
 495
 496   tmp = gfc_finish_block (&body);
 497
 498   rc = build3 (COMPONENT_REF, TREE_TYPE (ioparm_library_return), ioparm_var,
 499                ioparm_library_return, NULL_TREE);
 500
 501   tmp = build3_v (SWITCH_EXPR, rc, tmp, NULL_TREE);
 502
 503   gfc_add_expr_to_block (block, tmp);
 504 }
 505
 506
 507 /* Store the current file and line number to variables so that if a
 508    library call goes awry, we can tell the user where the problem is.  */
 509
 510 static void
 511 set_error_locus (stmtblock_t * block, locus * where)
 512 {
 513   gfc_file *f;
 514   tree tmp;
 515   int line;
 516
 517   f = where->lb->file;
 518   tmp = gfc_build_cstring_const (f->filename);
 519
 520   tmp = gfc_build_addr_expr (pchar_type_node, tmp);
 521   gfc_add_modify_expr (block, locus_file, tmp);
 522
 523 #ifdef USE_MAPPED_LOCATION
 524   line = LOCATION_LINE (where->lb->location);
 525 #else
 526   line = where->lb->linenum;
 527 #endif
 528   gfc_add_modify_expr (block, locus_line, build_int_cst (NULL_TREE, line));
 529 }
 530
 531
 532 /* Translate an OPEN statement.  */
 533
 534 tree
 535 gfc_trans_open (gfc_code * code)
 536 {
 537   stmtblock_t block, post_block;
 538   gfc_open *p;
 539   tree tmp;
 540
 541   gfc_init_block (&block);
 542   gfc_init_block (&post_block);
 543
 544   set_error_locus (&block, &code->loc);
 545   p = code->ext.open;
 546
 547   if (p->unit)
 548     set_parameter_value (&block, ioparm_unit, p->unit);
 549
 550   if (p->file)
 551     set_string (&block, &post_block, ioparm_file, ioparm_file_len, p->file);
 552
 553   if (p->status)
 554     set_string (&block, &post_block, ioparm_status,
 555                 ioparm_status_len, p->status);
 556
 557   if (p->access)
 558     set_string (&block, &post_block, ioparm_access,
 559                 ioparm_access_len, p->access);
 560
 561   if (p->form)
 562     set_string (&block, &post_block, ioparm_form, ioparm_form_len, p->form);
 563
 564   if (p->recl)
 565     set_parameter_value (&block, ioparm_recl_in, p->recl);
 566
 567   if (p->blank)
 568     set_string (&block, &post_block, ioparm_blank, ioparm_blank_len,
 569                 p->blank);
 570
 571   if (p->position)
 572     set_string (&block, &post_block, ioparm_position,
 573                 ioparm_position_len, p->position);
 574
 575   if (p->action)
 576     set_string (&block, &post_block, ioparm_action,
 577                 ioparm_action_len, p->action);
 578
 579   if (p->delim)
 580     set_string (&block, &post_block, ioparm_delim, ioparm_delim_len,
 581                 p->delim);
 582
 583   if (p->pad)
 584     set_string (&block, &post_block, ioparm_pad, ioparm_pad_len, p->pad);
 585
 586   if (p->iostat)
 587     set_parameter_ref (&block, ioparm_iostat, p->iostat);
 588
 589   if (p->err)
 590     set_flag (&block, ioparm_err);
 591
 592   tmp = gfc_build_function_call (iocall_open, NULL_TREE);
 593   gfc_add_expr_to_block (&block, tmp);
 594
 595   gfc_add_block_to_block (&block, &post_block);
 596
 597   io_result (&block, p->err, NULL, NULL);
 598
 599   return gfc_finish_block (&block);
 600 }
 601
 602
 603 /* Translate a CLOSE statement.  */
 604
 605 tree
 606 gfc_trans_close (gfc_code * code)
 607 {
 608   stmtblock_t block, post_block;
 609   gfc_close *p;
 610   tree tmp;
 611
 612   gfc_init_block (&block);
 613   gfc_init_block (&post_block);
 614
 615   set_error_locus (&block, &code->loc);
 616   p = code->ext.close;
 617
 618   if (p->unit)
 619     set_parameter_value (&block, ioparm_unit, p->unit);
 620
 621   if (p->status)
 622     set_string (&block, &post_block, ioparm_status,
 623                 ioparm_status_len, p->status);
 624
 625   if (p->iostat)
 626     set_parameter_ref (&block, ioparm_iostat, p->iostat);
 627
 628   if (p->err)
 629     set_flag (&block, ioparm_err);
 630
 631   tmp = gfc_build_function_call (iocall_close, NULL_TREE);
 632   gfc_add_expr_to_block (&block, tmp);
 633
 634   gfc_add_block_to_block (&block, &post_block);
 635
 636   io_result (&block, p->err, NULL, NULL);
 637
 638   return gfc_finish_block (&block);
 639 }
 640
 641
 642 /* Common subroutine for building a file positioning statement.  */
 643
 644 static tree
 645 build_filepos (tree function, gfc_code * code)
 646 {
 647   stmtblock_t block;
 648   gfc_filepos *p;
 649   tree tmp;
 650
 651   p = code->ext.filepos;
 652
 653   gfc_init_block (&block);
 654
 655   set_error_locus (&block, &code->loc);
 656
 657   if (p->unit)
 658     set_parameter_value (&block, ioparm_unit, p->unit);
 659
 660   if (p->iostat)
 661     set_parameter_ref (&block, ioparm_iostat, p->iostat);
 662
 663   if (p->err)
 664     set_flag (&block, ioparm_err);
 665
 666   tmp = gfc_build_function_call (function, NULL);
 667   gfc_add_expr_to_block (&block, tmp);
 668
 669   io_result (&block, p->err, NULL, NULL);
 670
 671   return gfc_finish_block (&block);
 672 }
 673
 674
 675 /* Translate a BACKSPACE statement.  */
 676
 677 tree
 678 gfc_trans_backspace (gfc_code * code)
 679 {
 680
 681   return build_filepos (iocall_backspace, code);
 682 }
 683
 684
 685 /* Translate an ENDFILE statement.  */
 686
 687 tree
 688 gfc_trans_endfile (gfc_code * code)
 689 {
 690
 691   return build_filepos (iocall_endfile, code);
 692 }
 693
 694
 695 /* Translate a REWIND statement.  */
 696
 697 tree
 698 gfc_trans_rewind (gfc_code * code)
 699 {
 700
 701   return build_filepos (iocall_rewind, code);
 702 }
 703
 704
 705 /* Translate the non-IOLENGTH form of an INQUIRE statement.  */
 706
 707 tree
 708 gfc_trans_inquire (gfc_code * code)
 709 {
 710   stmtblock_t block, post_block;
 711   gfc_inquire *p;
 712   tree tmp;
 713
 714   gfc_init_block (&block);
 715   gfc_init_block (&post_block);
 716
 717   set_error_locus (&block, &code->loc);
 718   p = code->ext.inquire;
 719
 720   if (p->unit)
 721     set_parameter_value (&block, ioparm_unit, p->unit);
 722
 723   if (p->file)
 724     set_string (&block, &post_block, ioparm_file, ioparm_file_len, p->file);
 725
 726   if (p->iostat)
 727     set_parameter_ref (&block, ioparm_iostat, p->iostat);
 728
 729   if (p->exist)
 730     set_parameter_ref (&block, ioparm_exist, p->exist);
 731
 732   if (p->opened)
 733     set_parameter_ref (&block, ioparm_opened, p->opened);
 734
 735   if (p->number)
 736     set_parameter_ref (&block, ioparm_number, p->number);
 737
 738   if (p->named)
 739     set_parameter_ref (&block, ioparm_named, p->named);
 740
 741   if (p->name)
 742     set_string (&block, &post_block, ioparm_name, ioparm_name_len, p->name);
 743
 744   if (p->access)
 745     set_string (&block, &post_block, ioparm_access,
 746                 ioparm_access_len, p->access);
 747
 748   if (p->sequential)
 749     set_string (&block, &post_block, ioparm_sequential,
 750                 ioparm_sequential_len, p->sequential);
 751
 752   if (p->direct)
 753     set_string (&block, &post_block, ioparm_direct,
 754                 ioparm_direct_len, p->direct);
 755
 756   if (p->form)
 757     set_string (&block, &post_block, ioparm_form, ioparm_form_len, p->form);
 758
 759   if (p->formatted)
 760     set_string (&block, &post_block, ioparm_formatted,
 761                 ioparm_formatted_len, p->formatted);
 762
 763   if (p->unformatted)
 764     set_string (&block, &post_block, ioparm_unformatted,
 765                 ioparm_unformatted_len, p->unformatted);
 766
 767   if (p->recl)
 768     set_parameter_ref (&block, ioparm_recl_out, p->recl);
 769
 770   if (p->nextrec)
 771     set_parameter_ref (&block, ioparm_nextrec, p->nextrec);
 772
 773   if (p->blank)
 774     set_string (&block, &post_block, ioparm_blank, ioparm_blank_len,
 775                 p->blank);
 776
 777   if (p->position)
 778     set_string (&block, &post_block, ioparm_position,
 779                 ioparm_position_len, p->position);
 780
 781   if (p->action)
 782     set_string (&block, &post_block, ioparm_action,
 783                 ioparm_action_len, p->action);
 784
 785   if (p->read)
 786     set_string (&block, &post_block, ioparm_read, ioparm_read_len, p->read);
 787
 788   if (p->write)
 789     set_string (&block, &post_block, ioparm_write,
 790                 ioparm_write_len, p->write);
 791
 792   if (p->readwrite)
 793     set_string (&block, &post_block, ioparm_readwrite,
 794                 ioparm_readwrite_len, p->readwrite);
 795
 796   if (p->delim)
 797     set_string (&block, &post_block, ioparm_delim, ioparm_delim_len,
 798                 p->delim);
 799
 800   if (p->pad)
 801     set_string (&block, &post_block, ioparm_pad, ioparm_pad_len,
 802                 p->pad);
 803
 804   if (p->err)
 805     set_flag (&block, ioparm_err);
 806
 807   tmp = gfc_build_function_call (iocall_inquire, NULL);
 808   gfc_add_expr_to_block (&block, tmp);
 809
 810   gfc_add_block_to_block (&block, &post_block);
 811
 812   io_result (&block, p->err, NULL, NULL);
 813
 814   return gfc_finish_block (&block);
 815 }
 816
 817
 818 static gfc_expr *
 819 gfc_new_nml_name_expr (const char * name)
 820 {
 821    gfc_expr * nml_name;
 822    nml_name = gfc_get_expr();
 823    nml_name->ref = NULL;
 824    nml_name->expr_type = EXPR_CONSTANT;
 825    nml_name->ts.kind = gfc_default_character_kind;
 826    nml_name->ts.type = BT_CHARACTER;
 827    nml_name->value.character.length = strlen(name);
 828    nml_name->value.character.string = gfc_getmem (strlen (name) + 1);
 829    strcpy (nml_name->value.character.string, name);
 830
 831    return nml_name;
 832 }
 833
 834 static gfc_expr *
 835 get_new_var_expr(gfc_symbol * sym)
 836 {
 837   gfc_expr * nml_var;
 838
 839   nml_var = gfc_get_expr();
 840   nml_var->expr_type = EXPR_VARIABLE;
 841   nml_var->ts = sym->ts;
 842   if (sym->as)
 843     nml_var->rank = sym->as->rank;
 844   nml_var->symtree = (gfc_symtree *)gfc_getmem (sizeof (gfc_symtree));
 845   nml_var->symtree->n.sym = sym;
 846   nml_var->where = sym->declared_at;
 847   sym->attr.referenced = 1;
 848
 849   return nml_var;
 850 }
 851
 852 /* For a scalar variable STRING whose address is ADDR_EXPR, generate a
 853    call to iocall_set_nml_val.  For derived type variable, recursively
 854    generate calls to iocall_set_nml_val for each leaf field. The leafs
 855    have no names -- their STRING field is null, and are interpreted by
 856    the run-time library as having only the value, as in the example:
 857
 858    &foo bzz=1,2,3,4,5/
 859
 860    Note that the first output field appears after the name of the
 861    variable, not of the field name.  This causes a little complication
 862    documented below.  */
 863
 864 static void
 865 transfer_namelist_element (stmtblock_t * block, gfc_typespec * ts, tree addr_expr,
 866                            tree string, tree string_length)
 867 {
 868   tree tmp, args, arg2;
 869   tree expr;
 870
 871   gcc_assert (POINTER_TYPE_P (TREE_TYPE (addr_expr)));
 872
 873   if (ts->type == BT_DERIVED)
 874     {
 875       gfc_component *c;
 876       expr = gfc_build_indirect_ref (addr_expr);
 877
 878       for (c = ts->derived->components; c; c = c->next)
 879         {
 880           tree field = c->backend_decl;
 881           gcc_assert (field && TREE_CODE (field) == FIELD_DECL);
 882           tmp = build3 (COMPONENT_REF, TREE_TYPE (field),
 883                         expr, field, NULL_TREE);
 884
 885           if (c->dimension)
 886             gfc_todo_error ("NAMELIST IO of array in derived type");
 887           if (!c->pointer)
 888             tmp = gfc_build_addr_expr (NULL, tmp);
 889           transfer_namelist_element (block, &c->ts, tmp, string, string_length);
 890
 891           /* The first output field bears the name of the topmost
 892              derived type variable.  All other fields are anonymous
 893              and appear with nulls in their string and string_length
 894              fields.  After the first use, we set string and
 895              string_length to null.  */
 896           string = null_pointer_node;
 897           string_length = integer_zero_node;
 898         }
 899
 900       return;
 901     }
 902
 903   args = gfc_chainon_list (NULL_TREE, addr_expr);
 904   args = gfc_chainon_list (args, string);
 905   args = gfc_chainon_list (args, string_length);
 906   arg2 = build_int_cst (gfc_array_index_type, ts->kind);
 907   args = gfc_chainon_list (args,arg2);
 908
 909   switch (ts->type)
 910     {
 911     case BT_INTEGER:
 912       tmp = gfc_build_function_call (iocall_set_nml_val_int, args);
 913       break;
 914
 915     case BT_CHARACTER:
 916       expr = gfc_build_indirect_ref (addr_expr);
 917       gcc_assert (TREE_CODE (TREE_TYPE (expr)) == ARRAY_TYPE);
 918       args = gfc_chainon_list (args,
 919                                TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (expr))));
 920       tmp = gfc_build_function_call (iocall_set_nml_val_char, args);
 921       break;
 922
 923     case BT_REAL:
 924       tmp = gfc_build_function_call (iocall_set_nml_val_float, args);
 925       break;
 926
 927     case BT_LOGICAL:
 928       tmp = gfc_build_function_call (iocall_set_nml_val_log, args);
 929       break;
 930
 931     case BT_COMPLEX:
 932       tmp = gfc_build_function_call (iocall_set_nml_val_complex, args);
 933       break;
 934
 935     default :
 936       internal_error ("Bad namelist IO basetype (%d)", ts->type);
 937     }
 938
 939   gfc_add_expr_to_block (block, tmp);
 940 }
 941
 942 /* Create a data transfer statement.  Not all of the fields are valid
 943    for both reading and writing, but improper use has been filtered
 944    out by now.  */
 945
 946 static tree
 947 build_dt (tree * function, gfc_code * code)
 948 {
 949   stmtblock_t block, post_block;
 950   gfc_dt *dt;
 951   tree tmp;
 952   gfc_expr *nmlname, *nmlvar;
 953   gfc_namelist *nml;
 954   gfc_se se,se2;
 955
 956   gfc_init_block (&block);
 957   gfc_init_block (&post_block);
 958
 959   set_error_locus (&block, &code->loc);
 960   dt = code->ext.dt;
 961
 962   gcc_assert (dt != NULL);
 963
 964   if (dt->io_unit)
 965     {
 966       if (dt->io_unit->ts.type == BT_CHARACTER)
 967         {
 968           set_string (&block, &post_block, ioparm_internal_unit,
 969                       ioparm_internal_unit_len, dt->io_unit);
 970         }
 971       else
 972         set_parameter_value (&block, ioparm_unit, dt->io_unit);
 973     }
 974
 975   if (dt->rec)
 976     set_parameter_value (&block, ioparm_rec, dt->rec);
 977
 978   if (dt->advance)
 979     set_string (&block, &post_block, ioparm_advance, ioparm_advance_len,
 980                 dt->advance);
 981
 982   if (dt->format_expr)
 983     set_string (&block, &post_block, ioparm_format, ioparm_format_len,
 984                 dt->format_expr);
 985
 986   if (dt->format_label)
 987     {
 988       if (dt->format_label == &format_asterisk)
 989         set_flag (&block, ioparm_list_format);
 990       else
 991         set_string (&block, &post_block, ioparm_format,
 992                     ioparm_format_len, dt->format_label->format);
 993     }
 994
 995   if (dt->iostat)
 996     set_parameter_ref (&block, ioparm_iostat, dt->iostat);
 997
 998   if (dt->size)
 999     set_parameter_ref (&block, ioparm_size, dt->size);
1000
1001   if (dt->err)
1002     set_flag (&block, ioparm_err);
1003
1004   if (dt->eor)
1005     set_flag(&block, ioparm_eor);
1006
1007   if (dt->end)
1008     set_flag(&block, ioparm_end);
1009
1010   if (dt->namelist)
1011     {
1012        if (dt->format_expr || dt->format_label)
1013           fatal_error("A format cannot be specified with a namelist");
1014
1015        nmlname = gfc_new_nml_name_expr(dt->namelist->name);
1016
1017        set_string (&block, &post_block, ioparm_namelist_name,
1018                 ioparm_namelist_name_len, nmlname);
1019
1020        if (last_dt == READ)
1021           set_flag (&block, ioparm_namelist_read_mode);
1022
1023         for (nml = dt->namelist->namelist; nml; nml = nml->next)
1024           {
1025             gfc_init_se (&se, NULL);
1026             gfc_init_se (&se2, NULL);
1027             nmlvar = get_new_var_expr (nml->sym);
1028             nmlname = gfc_new_nml_name_expr (nml->sym->name);
1029             gfc_conv_expr_reference (&se2, nmlname);
1030             gfc_conv_expr_reference (&se, nmlvar);
1031             gfc_evaluate_now (se.expr, &se.pre);
1032
1033             transfer_namelist_element (&block, &nml->sym->ts, se.expr,
1034                                        se2.expr, se2.string_length);
1035           }
1036     }
1037
1038   tmp = gfc_build_function_call (*function, NULL_TREE);
1039   gfc_add_expr_to_block (&block, tmp);
1040
1041   gfc_add_block_to_block (&block, &post_block);
1042
1043   return gfc_finish_block (&block);
1044 }
1045
1046
1047 /* Translate the IOLENGTH form of an INQUIRE statement.  We treat
1048    this as a third sort of data transfer statement, except that
1049    lengths are summed instead of actually transferring any data.  */
1050
1051 tree
1052 gfc_trans_iolength (gfc_code * code)
1053 {
1054   stmtblock_t block;
1055   gfc_inquire *inq;
1056   tree dt;
1057
1058   gfc_init_block (&block);
1059
1060   set_error_locus (&block, &code->loc);
1061
1062   inq = code->ext.inquire;
1063
1064   /* First check that preconditions are met.  */
1065   gcc_assert (inq != NULL);
1066   gcc_assert (inq->iolength != NULL);
1067
1068   /* Connect to the iolength variable.  */
1069   if (inq->iolength)
1070     set_parameter_ref (&block, ioparm_iolength, inq->iolength);
1071
1072   /* Actual logic.  */
1073   last_dt = IOLENGTH;
1074   dt = build_dt(&iocall_iolength, code);
1075
1076   gfc_add_expr_to_block (&block, dt);
1077
1078   return gfc_finish_block (&block);
1079 }
1080
1081
1082 /* Translate a READ statement.  */
1083
1084 tree
1085 gfc_trans_read (gfc_code * code)
1086 {
1087
1088   last_dt = READ;
1089   return build_dt (&iocall_read, code);
1090 }
1091
1092
1093 /* Translate a WRITE statement */
1094
1095 tree
1096 gfc_trans_write (gfc_code * code)
1097 {
1098
1099   last_dt = WRITE;
1100   return build_dt (&iocall_write, code);
1101 }
1102
1103
1104 /* Finish a data transfer statement.  */
1105
1106 tree
1107 gfc_trans_dt_end (gfc_code * code)
1108 {
1109   tree function, tmp;
1110   stmtblock_t block;
1111
1112   gfc_init_block (&block);
1113
1114   switch (last_dt)
1115     {
1116     case READ:
1117       function = iocall_read_done;
1118       break;
1119
1120     case WRITE:
1121       function = iocall_write_done;
1122       break;
1123
1124     case IOLENGTH:
1125       function = iocall_iolength_done;
1126       break;
1127
1128     default:
1129       gcc_unreachable ();
1130     }
1131
1132   tmp = gfc_build_function_call (function, NULL);
1133   gfc_add_expr_to_block (&block, tmp);
1134
1135   if (last_dt != IOLENGTH)
1136     {
1137       gcc_assert (code->ext.dt != NULL);
1138       io_result (&block, code->ext.dt->err,
1139                  code->ext.dt->end, code->ext.dt->eor);
1140     }
1141
1142   return gfc_finish_block (&block);
1143 }
1144
1145 static void
1146 transfer_expr (gfc_se * se, gfc_typespec * ts, tree addr_expr);
1147
1148 /* Given an array field in a derived type variable, generate the code
1149    for the loop that iterates over array elements, and the code that
1150    accesses those array elements.  Use transfer_expr to generate code
1151    for transferring that element.  Because elements may also be
1152    derived types, transfer_expr and transfer_array_component are mutually
1153    recursive.  */
1154
1155 static tree
1156 transfer_array_component (tree expr, gfc_component * cm)
1157 {
1158   tree tmp;
1159   stmtblock_t body;
1160   stmtblock_t block;
1161   gfc_loopinfo loop;
1162   int n;
1163   gfc_ss *ss;
1164   gfc_se se;
1165
1166   gfc_start_block (&block);
1167   gfc_init_se (&se, NULL);
1168
1169   /* Create and initialize Scalarization Status.  Unlike in
1170      gfc_trans_transfer, we can't simply use gfc_walk_expr to take
1171      care of this task, because we don't have a gfc_expr at hand.
1172      Build one manually, as in gfc_trans_subarray_assign.  */
1173
1174   ss = gfc_get_ss ();
1175   ss->type = GFC_SS_COMPONENT;
1176   ss->expr = NULL;
1177   ss->shape = gfc_get_shape (cm->as->rank);
1178   ss->next = gfc_ss_terminator;
1179   ss->data.info.dimen = cm->as->rank;
1180   ss->data.info.descriptor = expr;
1181   ss->data.info.data = gfc_conv_array_data (expr);
1182   ss->data.info.offset = gfc_conv_array_offset (expr);
1183   for (n = 0; n < cm->as->rank; n++)
1184     {
1185       ss->data.info.dim[n] = n;
1186       ss->data.info.start[n] = gfc_conv_array_lbound (expr, n);
1187       ss->data.info.stride[n] = gfc_index_one_node;
1188
1189       mpz_init (ss->shape[n]);
1190       mpz_sub (ss->shape[n], cm->as->upper[n]->value.integer,
1191                cm->as->lower[n]->value.integer);
1192       mpz_add_ui (ss->shape[n], ss->shape[n], 1);
1193     }
1194
1195   /* Once we got ss, we use scalarizer to create the loop.  */
1196
1197   gfc_init_loopinfo (&loop);
1198   gfc_add_ss_to_loop (&loop, ss);
1199   gfc_conv_ss_startstride (&loop);
1200   gfc_conv_loop_setup (&loop);
1201   gfc_mark_ss_chain_used (ss, 1);
1202   gfc_start_scalarized_body (&loop, &body);
1203
1204   gfc_copy_loopinfo_to_se (&se, &loop);
1205   se.ss = ss;
1206
1207   /* gfc_conv_tmp_array_ref assumes that se.expr contains the array.  */
1208   se.expr = expr;
1209   gfc_conv_tmp_array_ref (&se);
1210
1211   /* Now se.expr contains an element of the array.  Take the address and pass
1212      it to the IO routines.  */
1213   tmp = gfc_build_addr_expr (NULL, se.expr);
1214   transfer_expr (&se, &cm->ts, tmp);
1215
1216   /* We are done now with the loop body.  Wrap up the scalarizer and
1217      return.  */
1218
1219   gfc_add_block_to_block (&body, &se.pre);
1220   gfc_add_block_to_block (&body, &se.post);
1221
1222   gfc_trans_scalarizing_loops (&loop, &body);
1223
1224   gfc_add_block_to_block (&block, &loop.pre);
1225   gfc_add_block_to_block (&block, &loop.post);
1226
1227   for (n = 0; n < cm->as->rank; n++)
1228     mpz_clear (ss->shape[n]);
1229   gfc_free (ss->shape);
1230
1231   gfc_cleanup_loop (&loop);
1232
1233   return gfc_finish_block (&block);
1234 }
1235
1236 /* Generate the call for a scalar transfer node.  */
1237
1238 static void
1239 transfer_expr (gfc_se * se, gfc_typespec * ts, tree addr_expr)
1240 {
1241   tree args, tmp, function, arg2, field, expr;
1242   gfc_component *c;
1243   int kind;
1244
1245   kind = ts->kind;
1246   function = NULL;
1247   arg2 = NULL;
1248
1249   switch (ts->type)
1250     {
1251     case BT_INTEGER:
1252       arg2 = build_int_cst (NULL_TREE, kind);
1253       function = iocall_x_integer;
1254       break;
1255
1256     case BT_REAL:
1257       arg2 = build_int_cst (NULL_TREE, kind);
1258       function = iocall_x_real;
1259       break;
1260
1261     case BT_COMPLEX:
1262       arg2 = build_int_cst (NULL_TREE, kind);
1263       function = iocall_x_complex;
1264       break;
1265
1266     case BT_LOGICAL:
1267       arg2 = build_int_cst (NULL_TREE, kind);
1268       function = iocall_x_logical;
1269       break;
1270
1271     case BT_CHARACTER:
1272       if (se->string_length)
1273         arg2 = se->string_length;
1274       else
1275         {
1276           tmp = gfc_build_indirect_ref (addr_expr);
1277           gcc_assert (TREE_CODE (TREE_TYPE (tmp)) == ARRAY_TYPE);
1278           arg2 = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (tmp)));
1279         }
1280       function = iocall_x_character;
1281       break;
1282
1283     case BT_DERIVED:
1284       /* Recurse into the elements of the derived type.  */
1285       expr = gfc_evaluate_now (addr_expr, &se->pre);
1286       expr = gfc_build_indirect_ref (expr);
1287
1288       for (c = ts->derived->components; c; c = c->next)
1289         {
1290           field = c->backend_decl;
1291           gcc_assert (field && TREE_CODE (field) == FIELD_DECL);
1292
1293           tmp = build3 (COMPONENT_REF, TREE_TYPE (field), expr, field,
1294                         NULL_TREE);
1295
1296           if (c->dimension)
1297             {
1298               tmp = transfer_array_component (tmp, c);
1299               gfc_add_expr_to_block (&se->pre, tmp);
1300             }
1301           else
1302             {
1303               if (!c->pointer)
1304                 tmp = gfc_build_addr_expr (NULL, tmp);
1305               transfer_expr (se, &c->ts, tmp);
1306             }
1307         }
1308       return;
1309
1310     default:
1311       internal_error ("Bad IO basetype (%d)", ts->type);
1312     }
1313
1314   args = gfc_chainon_list (NULL_TREE, addr_expr);
1315   args = gfc_chainon_list (args, arg2);
1316
1317   tmp = gfc_build_function_call (function, args);
1318   gfc_add_expr_to_block (&se->pre, tmp);
1319   gfc_add_block_to_block (&se->pre, &se->post);
1320
1321 }
1322
1323
1324 /* gfc_trans_transfer()-- Translate a TRANSFER code node */
1325
1326 tree
1327 gfc_trans_transfer (gfc_code * code)
1328 {
1329   stmtblock_t block, body;
1330   gfc_loopinfo loop;
1331   gfc_expr *expr;
1332   gfc_ss *ss;
1333   gfc_se se;
1334   tree tmp;
1335
1336   gfc_start_block (&block);
1337
1338   expr = code->expr;
1339   ss = gfc_walk_expr (expr);
1340
1341   gfc_init_se (&se, NULL);
1342
1343   if (ss == gfc_ss_terminator)
1344     gfc_init_block (&body);
1345   else
1346     {
1347       /* Initialize the scalarizer.  */
1348       gfc_init_loopinfo (&loop);
1349       gfc_add_ss_to_loop (&loop, ss);
1350
1351       /* Initialize the loop.  */
1352       gfc_conv_ss_startstride (&loop);
1353       gfc_conv_loop_setup (&loop);
1354
1355       /* The main loop body.  */
1356       gfc_mark_ss_chain_used (ss, 1);
1357       gfc_start_scalarized_body (&loop, &body);
1358
1359       gfc_copy_loopinfo_to_se (&se, &loop);
1360       se.ss = ss;
1361     }
1362
1363   gfc_conv_expr_reference (&se, expr);
1364
1365   transfer_expr (&se, &expr->ts, se.expr);
1366
1367   gfc_add_block_to_block (&body, &se.pre);
1368   gfc_add_block_to_block (&body, &se.post);
1369
1370   if (se.ss == NULL)
1371     tmp = gfc_finish_block (&body);
1372   else
1373     {
1374       gcc_assert (se.ss == gfc_ss_terminator);
1375       gfc_trans_scalarizing_loops (&loop, &body);
1376
1377       gfc_add_block_to_block (&loop.pre, &loop.post);
1378       tmp = gfc_finish_block (&loop.pre);
1379       gfc_cleanup_loop (&loop);
1380     }
1381
1382   gfc_add_expr_to_block (&block, tmp);
1383
1384   return gfc_finish_block (&block);
1385 }
1386
1387 #include "gt-fortran-trans-io.h"
1388