gcc/fortran/trans-io.c

   1 /* IO Code translation/library interface
   2    Copyright (C) 2002, 2003, 2004 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 <stdio.h>
  29 #include "ggc.h"
  30 #include "toplev.h"
  31 #include "real.h"
  32 #include <assert.h>
  33 #include <gmp.h>
  34 #include "gfortran.h"
  35 #include "trans.h"
  36 #include "trans-stmt.h"
  37 #include "trans-array.h"
  38 #include "trans-types.h"
  39 #include "trans-const.h"
  40
  41
  42 static GTY(()) tree gfc_pint4_type_node;
  43
  44 /* Members of the ioparm structure.  */
  45
  46 static GTY(()) tree ioparm_unit;
  47 static GTY(()) tree ioparm_err;
  48 static GTY(()) tree ioparm_end;
  49 static GTY(()) tree ioparm_eor;
  50 static GTY(()) tree ioparm_list_format;
  51 static GTY(()) tree ioparm_library_return;
  52 static GTY(()) tree ioparm_iostat;
  53 static GTY(()) tree ioparm_exist;
  54 static GTY(()) tree ioparm_opened;
  55 static GTY(()) tree ioparm_number;
  56 static GTY(()) tree ioparm_named;
  57 static GTY(()) tree ioparm_rec;
  58 static GTY(()) tree ioparm_nextrec;
  59 static GTY(()) tree ioparm_size;
  60 static GTY(()) tree ioparm_recl_in;
  61 static GTY(()) tree ioparm_recl_out;
  62 static GTY(()) tree ioparm_iolength;
  63 static GTY(()) tree ioparm_file;
  64 static GTY(()) tree ioparm_file_len;
  65 static GTY(()) tree ioparm_status;
  66 static GTY(()) tree ioparm_status_len;
  67 static GTY(()) tree ioparm_access;
  68 static GTY(()) tree ioparm_access_len;
  69 static GTY(()) tree ioparm_form;
  70 static GTY(()) tree ioparm_form_len;
  71 static GTY(()) tree ioparm_blank;
  72 static GTY(()) tree ioparm_blank_len;
  73 static GTY(()) tree ioparm_position;
  74 static GTY(()) tree ioparm_position_len;
  75 static GTY(()) tree ioparm_action;
  76 static GTY(()) tree ioparm_action_len;
  77 static GTY(()) tree ioparm_delim;
  78 static GTY(()) tree ioparm_delim_len;
  79 static GTY(()) tree ioparm_pad;
  80 static GTY(()) tree ioparm_pad_len;
  81 static GTY(()) tree ioparm_format;
  82 static GTY(()) tree ioparm_format_len;
  83 static GTY(()) tree ioparm_advance;
  84 static GTY(()) tree ioparm_advance_len;
  85 static GTY(()) tree ioparm_name;
  86 static GTY(()) tree ioparm_name_len;
  87 static GTY(()) tree ioparm_internal_unit;
  88 static GTY(()) tree ioparm_internal_unit_len;
  89 static GTY(()) tree ioparm_sequential;
  90 static GTY(()) tree ioparm_sequential_len;
  91 static GTY(()) tree ioparm_direct;
  92 static GTY(()) tree ioparm_direct_len;
  93 static GTY(()) tree ioparm_formatted;
  94 static GTY(()) tree ioparm_formatted_len;
  95 static GTY(()) tree ioparm_unformatted;
  96 static GTY(()) tree ioparm_unformatted_len;
  97 static GTY(()) tree ioparm_read;
  98 static GTY(()) tree ioparm_read_len;
  99 static GTY(()) tree ioparm_write;
 100 static GTY(()) tree ioparm_write_len;
 101 static GTY(()) tree ioparm_readwrite;
 102 static GTY(()) tree ioparm_readwrite_len;
 103 static GTY(()) tree ioparm_namelist_name;
 104 static GTY(()) tree ioparm_namelist_name_len;
 105 static GTY(()) tree ioparm_namelist_read_mode;
 106
 107 /* The global I/O variables */
 108
 109 static GTY(()) tree ioparm_var;
 110 static GTY(()) tree locus_file;
 111 static GTY(()) tree locus_line;
 112
 113
 114 /* Library I/O subroutines */
 115
 116 static GTY(()) tree iocall_read;
 117 static GTY(()) tree iocall_read_done;
 118 static GTY(()) tree iocall_write;
 119 static GTY(()) tree iocall_write_done;
 120 static GTY(()) tree iocall_x_integer;
 121 static GTY(()) tree iocall_x_logical;
 122 static GTY(()) tree iocall_x_character;
 123 static GTY(()) tree iocall_x_real;
 124 static GTY(()) tree iocall_x_complex;
 125 static GTY(()) tree iocall_open;
 126 static GTY(()) tree iocall_close;
 127 static GTY(()) tree iocall_inquire;
 128 static GTY(()) tree iocall_iolength;
 129 static GTY(()) tree iocall_iolength_done;
 130 static GTY(()) tree iocall_rewind;
 131 static GTY(()) tree iocall_backspace;
 132 static GTY(()) tree iocall_endfile;
 133 static GTY(()) tree iocall_set_nml_val_int;
 134 static GTY(()) tree iocall_set_nml_val_float;
 135 static GTY(()) tree iocall_set_nml_val_char;
 136 static GTY(()) tree iocall_set_nml_val_complex;
 137 static GTY(()) tree iocall_set_nml_val_log;
 138
 139 /* Variable for keeping track of what the last data transfer statement
 140    was.  Used for deciding which subroutine to call when the data
 141    transfer is complete. */
 142 static enum { READ, WRITE, IOLENGTH } last_dt;
 143
 144 #define ADD_FIELD(name, type)                                           \
 145   ioparm_ ## name = gfc_add_field_to_struct                             \
 146         (&(TYPE_FIELDS (ioparm_type)), ioparm_type,                     \
 147          get_identifier (stringize(name)), type)
 148
 149 #define ADD_STRING(name) \
 150   ioparm_ ## name = gfc_add_field_to_struct                             \
 151         (&(TYPE_FIELDS (ioparm_type)), ioparm_type,                     \
 152          get_identifier (stringize(name)), pchar_type_node);            \
 153   ioparm_ ## name ## _len = gfc_add_field_to_struct                     \
 154         (&(TYPE_FIELDS (ioparm_type)), ioparm_type,                     \
 155          get_identifier (stringize(name) "_len"), gfc_int4_type_node)
 156
 157
 158 /* Create function decls for IO library functions.  */
 159
 160 void
 161 gfc_build_io_library_fndecls (void)
 162 {
 163   tree ioparm_type;
 164
 165   gfc_pint4_type_node = build_pointer_type (gfc_int4_type_node);
 166
 167 /* Build the st_parameter structure.  Information associated with I/O
 168    calls are transferred here.  This must match the one defined in the
 169    library exactly. */
 170
 171   ioparm_type = make_node (RECORD_TYPE);
 172   TYPE_NAME (ioparm_type) = get_identifier ("_gfc_ioparm");
 173
 174   ADD_FIELD (unit, gfc_int4_type_node);
 175   ADD_FIELD (err, gfc_int4_type_node);
 176   ADD_FIELD (end, gfc_int4_type_node);
 177   ADD_FIELD (eor, gfc_int4_type_node);
 178   ADD_FIELD (list_format, gfc_int4_type_node);
 179   ADD_FIELD (library_return, gfc_int4_type_node);
 180
 181   ADD_FIELD (iostat, gfc_pint4_type_node);
 182   ADD_FIELD (exist, gfc_pint4_type_node);
 183   ADD_FIELD (opened, gfc_pint4_type_node);
 184   ADD_FIELD (number, gfc_pint4_type_node);
 185   ADD_FIELD (named, gfc_pint4_type_node);
 186   ADD_FIELD (rec, gfc_pint4_type_node);
 187   ADD_FIELD (nextrec, gfc_pint4_type_node);
 188   ADD_FIELD (size, gfc_pint4_type_node);
 189
 190   ADD_FIELD (recl_in, gfc_pint4_type_node);
 191   ADD_FIELD (recl_out, gfc_pint4_type_node);
 192
 193   ADD_FIELD (iolength, gfc_pint4_type_node);
 194
 195   ADD_STRING (file);
 196   ADD_STRING (status);
 197
 198   ADD_STRING (access);
 199   ADD_STRING (form);
 200   ADD_STRING (blank);
 201   ADD_STRING (position);
 202   ADD_STRING (action);
 203   ADD_STRING (delim);
 204   ADD_STRING (pad);
 205   ADD_STRING (format);
 206   ADD_STRING (advance);
 207   ADD_STRING (name);
 208   ADD_STRING (internal_unit);
 209   ADD_STRING (sequential);
 210
 211   ADD_STRING (direct);
 212   ADD_STRING (formatted);
 213   ADD_STRING (unformatted);
 214   ADD_STRING (read);
 215   ADD_STRING (write);
 216   ADD_STRING (readwrite);
 217
 218   ADD_STRING (namelist_name);
 219   ADD_FIELD (namelist_read_mode, gfc_int4_type_node);
 220
 221   gfc_finish_type (ioparm_type);
 222
 223   ioparm_var = build_decl (VAR_DECL, get_identifier (PREFIX("ioparm")),
 224                            ioparm_type);
 225   DECL_EXTERNAL (ioparm_var) = 1;
 226   TREE_PUBLIC (ioparm_var) = 1;
 227
 228   locus_line = build_decl (VAR_DECL, get_identifier (PREFIX("line")),
 229                            gfc_int4_type_node);
 230   DECL_EXTERNAL (locus_line) = 1;
 231   TREE_PUBLIC (locus_line) = 1;
 232
 233   locus_file = build_decl (VAR_DECL, get_identifier (PREFIX("filename")),
 234                            pchar_type_node);
 235   DECL_EXTERNAL (locus_file) = 1;
 236   TREE_PUBLIC (locus_file) = 1;
 237
 238   /* Define the transfer functions.  */
 239
 240   iocall_x_integer =
 241     gfc_build_library_function_decl (get_identifier
 242                                      (PREFIX("transfer_integer")),
 243                                      void_type_node, 2, pvoid_type_node,
 244                                      gfc_int4_type_node);
 245
 246   iocall_x_logical =
 247     gfc_build_library_function_decl (get_identifier
 248                                      (PREFIX("transfer_logical")),
 249                                      void_type_node, 2, pvoid_type_node,
 250                                      gfc_int4_type_node);
 251
 252   iocall_x_character =
 253     gfc_build_library_function_decl (get_identifier
 254                                      (PREFIX("transfer_character")),
 255                                      void_type_node, 2, pvoid_type_node,
 256                                      gfc_int4_type_node);
 257
 258   iocall_x_real =
 259     gfc_build_library_function_decl (get_identifier (PREFIX("transfer_real")),
 260                                      void_type_node, 2,
 261                                      pvoid_type_node, gfc_int4_type_node);
 262
 263   iocall_x_complex =
 264     gfc_build_library_function_decl (get_identifier
 265                                      (PREFIX("transfer_complex")),
 266                                      void_type_node, 2, pvoid_type_node,
 267                                      gfc_int4_type_node);
 268
 269   /* Library entry points */
 270
 271   iocall_read =
 272     gfc_build_library_function_decl (get_identifier (PREFIX("st_read")),
 273                                      void_type_node, 0);
 274
 275   iocall_write =
 276     gfc_build_library_function_decl (get_identifier (PREFIX("st_write")),
 277                                      void_type_node, 0);
 278   iocall_open =
 279     gfc_build_library_function_decl (get_identifier (PREFIX("st_open")),
 280                                      void_type_node, 0);
 281
 282   iocall_close =
 283     gfc_build_library_function_decl (get_identifier (PREFIX("st_close")),
 284                                      void_type_node, 0);
 285
 286   iocall_inquire =
 287     gfc_build_library_function_decl (get_identifier (PREFIX("st_inquire")),
 288                                      gfc_int4_type_node, 0);
 289
 290   iocall_iolength =
 291     gfc_build_library_function_decl(get_identifier (PREFIX("st_iolength")),
 292                                     void_type_node, 0);
 293
 294   iocall_rewind =
 295     gfc_build_library_function_decl (get_identifier (PREFIX("st_rewind")),
 296                                      gfc_int4_type_node, 0);
 297
 298   iocall_backspace =
 299     gfc_build_library_function_decl (get_identifier (PREFIX("st_backspace")),
 300                                      gfc_int4_type_node, 0);
 301
 302   iocall_endfile =
 303     gfc_build_library_function_decl (get_identifier (PREFIX("st_endfile")),
 304                                      gfc_int4_type_node, 0);
 305   /* Library helpers */
 306
 307   iocall_read_done =
 308     gfc_build_library_function_decl (get_identifier (PREFIX("st_read_done")),
 309                                      gfc_int4_type_node, 0);
 310
 311   iocall_write_done =
 312     gfc_build_library_function_decl (get_identifier (PREFIX("st_write_done")),
 313                                      gfc_int4_type_node, 0);
 314
 315   iocall_iolength_done =
 316     gfc_build_library_function_decl (get_identifier (PREFIX("st_iolength_done")),
 317                                      gfc_int4_type_node, 0);
 318
 319   iocall_set_nml_val_int =
 320     gfc_build_library_function_decl (get_identifier (PREFIX("st_set_nml_var_int")),
 321                                      void_type_node, 4,
 322                                      pvoid_type_node, pvoid_type_node,
 323                                      gfc_int4_type_node,gfc_int4_type_node);
 324
 325   iocall_set_nml_val_float =
 326     gfc_build_library_function_decl (get_identifier (PREFIX("st_set_nml_var_float")),
 327                                      void_type_node, 4,
 328                                      pvoid_type_node, pvoid_type_node,
 329                                      gfc_int4_type_node,gfc_int4_type_node);
 330   iocall_set_nml_val_char =
 331     gfc_build_library_function_decl (get_identifier (PREFIX("st_set_nml_var_char")),
 332                                      void_type_node, 4,
 333                                      pvoid_type_node, pvoid_type_node,
 334                                      gfc_int4_type_node,gfc_int4_type_node);
 335   iocall_set_nml_val_complex =
 336     gfc_build_library_function_decl (get_identifier (PREFIX("st_set_nml_var_complex")),
 337                                      void_type_node, 4,
 338                                      pvoid_type_node, pvoid_type_node,
 339                                      gfc_int4_type_node,gfc_int4_type_node);
 340   iocall_set_nml_val_log =
 341     gfc_build_library_function_decl (get_identifier (PREFIX("st_set_nml_var_log")),
 342                                      void_type_node, 4,
 343                                      pvoid_type_node, pvoid_type_node,
 344                                      gfc_int4_type_node,gfc_int4_type_node);
 345
 346 }
 347
 348
 349 /* Generate code to store an non-string I/O parameter into the
 350    ioparm structure.  This is a pass by value.  */
 351
 352 static void
 353 set_parameter_value (stmtblock_t * block, tree var, gfc_expr * e)
 354 {
 355   gfc_se se;
 356   tree tmp;
 357
 358   gfc_init_se (&se, NULL);
 359   gfc_conv_expr_type (&se, e, TREE_TYPE (var));
 360   gfc_add_block_to_block (block, &se.pre);
 361
 362   tmp = build (COMPONENT_REF, TREE_TYPE (var), ioparm_var, var, NULL_TREE);
 363   gfc_add_modify_expr (block, tmp, se.expr);
 364 }
 365
 366
 367 /* Generate code to store an non-string I/O parameter into the
 368    ioparm structure.  This is pass by reference.  */
 369
 370 static void
 371 set_parameter_ref (stmtblock_t * block, tree var, gfc_expr * e)
 372 {
 373   gfc_se se;
 374   tree tmp;
 375
 376   gfc_init_se (&se, NULL);
 377   se.want_pointer = 1;
 378
 379   gfc_conv_expr_type (&se, e, TREE_TYPE (var));
 380   gfc_add_block_to_block (block, &se.pre);
 381
 382   tmp = build (COMPONENT_REF, TREE_TYPE (var), ioparm_var, var, NULL_TREE);
 383   gfc_add_modify_expr (block, tmp, se.expr);
 384 }
 385
 386
 387 /* Generate code to store a string and its length into the
 388    ioparm structure.  */
 389
 390 static void
 391 set_string (stmtblock_t * block, stmtblock_t * postblock, tree var,
 392             tree var_len, gfc_expr * e)
 393 {
 394   gfc_se se;
 395   tree tmp;
 396   tree msg;
 397   tree io;
 398   tree len;
 399
 400   gfc_init_se (&se, NULL);
 401   gfc_conv_expr (&se, e);
 402
 403   io = build (COMPONENT_REF, TREE_TYPE (var), ioparm_var, var, NULL_TREE);
 404   len = build (COMPONENT_REF, TREE_TYPE (var_len), ioparm_var, var_len,
 405                NULL_TREE);
 406
 407   /*  Integer variable assigned a format label.  */
 408   if (e->ts.type == BT_INTEGER && e->symtree->n.sym->attr.assign == 1)
 409     {
 410       msg =
 411         gfc_build_string_const (37, "Assigned label is not a format label");
 412       tmp = GFC_DECL_STRING_LEN (se.expr);
 413       tmp = build (LE_EXPR, boolean_type_node, 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, 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;
 436
 437   tmp = build (COMPONENT_REF, TREE_TYPE(var), ioparm_var, var, NULL_TREE);
 438   gfc_add_modify_expr (block, tmp, 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_2 (label_value, 0);
 453
 454   /* Make a backend label for this case.  */
 455   tmp = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
 456   DECL_CONTEXT (tmp) = current_function_decl;
 457
 458   /* And the case itself.  */
 459   tmp = build_v (CASE_LABEL_EXPR, value, NULL_TREE, tmp);
 460   gfc_add_expr_to_block (body, tmp);
 461
 462   /* Jump to the label.  */
 463   tmp = build1_v (GOTO_EXPR, gfc_get_label_decl (label));
 464   gfc_add_expr_to_block (body, tmp);
 465 }
 466
 467
 468 /* Generate a switch statement that branches to the correct I/O
 469    result label.  The last statement of an I/O call stores the
 470    result into a variable because there is often cleanup that
 471    must be done before the switch, so a temporary would have to
 472    be created anyway.  */
 473
 474 static void
 475 io_result (stmtblock_t * block, gfc_st_label * err_label,
 476            gfc_st_label * end_label, gfc_st_label * eor_label)
 477 {
 478   stmtblock_t body;
 479   tree tmp, rc;
 480
 481   /* If no labels are specified, ignore the result instead
 482      of building an empty switch.  */
 483   if (err_label == NULL
 484       && end_label == NULL
 485       && eor_label == NULL)
 486     return;
 487
 488   /* Build a switch statement.  */
 489   gfc_start_block (&body);
 490
 491   /* The label values here must be the same as the values
 492      in the library_return enum in the runtime library */
 493   add_case (1, err_label, &body);
 494   add_case (2, end_label, &body);
 495   add_case (3, eor_label, &body);
 496
 497   tmp = gfc_finish_block (&body);
 498
 499   rc = build (COMPONENT_REF, TREE_TYPE (ioparm_library_return), ioparm_var,
 500               ioparm_library_return, NULL_TREE);
 501
 502   tmp = build_v (SWITCH_EXPR, rc, tmp, NULL_TREE);
 503
 504   gfc_add_expr_to_block (block, tmp);
 505 }
 506
 507
 508 /* Store the current file and line number to variables so that if a
 509    library call goes awry, we can tell the user where the problem is.  */
 510
 511 static void
 512 set_error_locus (stmtblock_t * block, locus * where)
 513 {
 514   gfc_file *f;
 515   tree tmp;
 516   int line;
 517
 518   f = where->lb->file;
 519   tmp = gfc_build_string_const (strlen (f->filename) + 1, f->filename);
 520
 521   tmp = gfc_build_addr_expr (pchar_type_node, tmp);
 522   gfc_add_modify_expr (block, locus_file, tmp);
 523
 524   line = where->lb->linenum;
 525   gfc_add_modify_expr (block, locus_line, build_int_2 (line, 0));
 526 }
 527
 528
 529 /* Translate an OPEN statement.  */
 530
 531 tree
 532 gfc_trans_open (gfc_code * code)
 533 {
 534   stmtblock_t block, post_block;
 535   gfc_open *p;
 536   tree tmp;
 537
 538   gfc_init_block (&block);
 539   gfc_init_block (&post_block);
 540
 541   set_error_locus (&block, &code->loc);
 542   p = code->ext.open;
 543
 544   if (p->unit)
 545     set_parameter_value (&block, ioparm_unit, p->unit);
 546
 547   if (p->file)
 548     set_string (&block, &post_block, ioparm_file, ioparm_file_len, p->file);
 549
 550   if (p->status)
 551     set_string (&block, &post_block, ioparm_status,
 552                 ioparm_status_len, p->status);
 553
 554   if (p->access)
 555     set_string (&block, &post_block, ioparm_access,
 556                 ioparm_access_len, p->access);
 557
 558   if (p->form)
 559     set_string (&block, &post_block, ioparm_form, ioparm_form_len, p->form);
 560
 561   if (p->recl)
 562     set_parameter_value (&block, ioparm_recl_in, p->recl);
 563
 564   if (p->blank)
 565     set_string (&block, &post_block, ioparm_blank, ioparm_blank_len,
 566                 p->blank);
 567
 568   if (p->position)
 569     set_string (&block, &post_block, ioparm_position,
 570                 ioparm_position_len, p->position);
 571
 572   if (p->action)
 573     set_string (&block, &post_block, ioparm_action,
 574                 ioparm_action_len, p->action);
 575
 576   if (p->delim)
 577     set_string (&block, &post_block, ioparm_delim, ioparm_delim_len,
 578                 p->delim);
 579
 580   if (p->pad)
 581     set_string (&block, &post_block, ioparm_pad, ioparm_pad_len, p->pad);
 582
 583   if (p->iostat)
 584     set_parameter_ref (&block, ioparm_iostat, p->iostat);
 585
 586   if (p->err)
 587     set_flag (&block, ioparm_err);
 588
 589   tmp = gfc_build_function_call (iocall_open, NULL_TREE);
 590   gfc_add_expr_to_block (&block, tmp);
 591
 592   gfc_add_block_to_block (&block, &post_block);
 593
 594   io_result (&block, p->err, NULL, NULL);
 595
 596   return gfc_finish_block (&block);
 597 }
 598
 599
 600 /* Translate a CLOSE statement.  */
 601
 602 tree
 603 gfc_trans_close (gfc_code * code)
 604 {
 605   stmtblock_t block, post_block;
 606   gfc_close *p;
 607   tree tmp;
 608
 609   gfc_init_block (&block);
 610   gfc_init_block (&post_block);
 611
 612   set_error_locus (&block, &code->loc);
 613   p = code->ext.close;
 614
 615   if (p->unit)
 616     set_parameter_value (&block, ioparm_unit, p->unit);
 617
 618   if (p->status)
 619     set_string (&block, &post_block, ioparm_status,
 620                 ioparm_status_len, p->status);
 621
 622   if (p->iostat)
 623     set_parameter_ref (&block, ioparm_iostat, p->iostat);
 624
 625   if (p->err)
 626     set_flag (&block, ioparm_err);
 627
 628   tmp = gfc_build_function_call (iocall_close, NULL_TREE);
 629   gfc_add_expr_to_block (&block, tmp);
 630
 631   gfc_add_block_to_block (&block, &post_block);
 632
 633   io_result (&block, p->err, NULL, NULL);
 634
 635   return gfc_finish_block (&block);
 636 }
 637
 638
 639 /* Common subroutine for building a file positioning statement.  */
 640
 641 static tree
 642 build_filepos (tree function, gfc_code * code)
 643 {
 644   stmtblock_t block;
 645   gfc_filepos *p;
 646   tree tmp;
 647
 648   p = code->ext.filepos;
 649
 650   gfc_init_block (&block);
 651
 652   set_error_locus (&block, &code->loc);
 653
 654   if (p->unit)
 655     set_parameter_value (&block, ioparm_unit, p->unit);
 656
 657   if (p->iostat)
 658     set_parameter_ref (&block, ioparm_iostat, p->iostat);
 659
 660   if (p->err)
 661     set_flag (&block, ioparm_err);
 662
 663   tmp = gfc_build_function_call (function, NULL);
 664   gfc_add_expr_to_block (&block, tmp);
 665
 666   io_result (&block, p->err, NULL, NULL);
 667
 668   return gfc_finish_block (&block);
 669 }
 670
 671
 672 /* Translate a BACKSPACE statement.  */
 673
 674 tree
 675 gfc_trans_backspace (gfc_code * code)
 676 {
 677
 678   return build_filepos (iocall_backspace, code);
 679 }
 680
 681
 682 /* Translate an ENDFILE statement.  */
 683
 684 tree
 685 gfc_trans_endfile (gfc_code * code)
 686 {
 687
 688   return build_filepos (iocall_endfile, code);
 689 }
 690
 691
 692 /* Translate a REWIND statement.  */
 693
 694 tree
 695 gfc_trans_rewind (gfc_code * code)
 696 {
 697
 698   return build_filepos (iocall_rewind, code);
 699 }
 700
 701
 702 /* Translate the non-IOLENGTH form of an INQUIRE statement.  */
 703
 704 tree
 705 gfc_trans_inquire (gfc_code * code)
 706 {
 707   stmtblock_t block, post_block;
 708   gfc_inquire *p;
 709   tree tmp;
 710
 711   gfc_init_block (&block);
 712   gfc_init_block (&post_block);
 713
 714   set_error_locus (&block, &code->loc);
 715   p = code->ext.inquire;
 716
 717   if (p->unit)
 718     set_parameter_value (&block, ioparm_unit, p->unit);
 719
 720   if (p->file)
 721     set_string (&block, &post_block, ioparm_file, ioparm_file_len, p->file);
 722
 723   if (p->iostat)
 724     set_parameter_ref (&block, ioparm_iostat, p->iostat);
 725
 726   if (p->exist)
 727     set_parameter_ref (&block, ioparm_exist, p->exist);
 728
 729   if (p->opened)
 730     set_parameter_ref (&block, ioparm_opened, p->opened);
 731
 732   if (p->number)
 733     set_parameter_ref (&block, ioparm_number, p->number);
 734
 735   if (p->named)
 736     set_parameter_ref (&block, ioparm_named, p->named);
 737
 738   if (p->name)
 739     set_string (&block, &post_block, ioparm_name, ioparm_name_len, p->name);
 740
 741   if (p->access)
 742     set_string (&block, &post_block, ioparm_access,
 743                 ioparm_access_len, p->access);
 744
 745   if (p->sequential)
 746     set_string (&block, &post_block, ioparm_sequential,
 747                 ioparm_sequential_len, p->sequential);
 748
 749   if (p->direct)
 750     set_string (&block, &post_block, ioparm_direct,
 751                 ioparm_direct_len, p->direct);
 752
 753   if (p->form)
 754     set_string (&block, &post_block, ioparm_form, ioparm_form_len, p->form);
 755
 756   if (p->formatted)
 757     set_string (&block, &post_block, ioparm_formatted,
 758                 ioparm_formatted_len, p->formatted);
 759
 760   if (p->unformatted)
 761     set_string (&block, &post_block, ioparm_unformatted,
 762                 ioparm_unformatted_len, p->unformatted);
 763
 764   if (p->recl)
 765     set_parameter_ref (&block, ioparm_recl_out, p->recl);
 766
 767   if (p->nextrec)
 768     set_parameter_ref (&block, ioparm_nextrec, p->nextrec);
 769
 770   if (p->blank)
 771     set_string (&block, &post_block, ioparm_blank, ioparm_blank_len,
 772                 p->blank);
 773
 774   if (p->position)
 775     set_string (&block, &post_block, ioparm_position,
 776                 ioparm_position_len, p->position);
 777
 778   if (p->action)
 779     set_string (&block, &post_block, ioparm_action,
 780                 ioparm_action_len, p->action);
 781
 782   if (p->read)
 783     set_string (&block, &post_block, ioparm_read, ioparm_read_len, p->read);
 784
 785   if (p->write)
 786     set_string (&block, &post_block, ioparm_write,
 787                 ioparm_write_len, p->write);
 788
 789   if (p->readwrite)
 790     set_string (&block, &post_block, ioparm_readwrite,
 791                 ioparm_readwrite_len, p->readwrite);
 792
 793   if (p->delim)
 794     set_string (&block, &post_block, ioparm_delim, ioparm_delim_len,
 795                 p->delim);
 796
 797   if (p->err)
 798     set_flag (&block, ioparm_err);
 799
 800   tmp = gfc_build_function_call (iocall_inquire, NULL);
 801   gfc_add_expr_to_block (&block, tmp);
 802
 803   gfc_add_block_to_block (&block, &post_block);
 804
 805   io_result (&block, p->err, NULL, NULL);
 806
 807   return gfc_finish_block (&block);
 808 }
 809
 810
 811 static gfc_expr *
 812 gfc_new_nml_name_expr (char * name)
 813 {
 814    gfc_expr * nml_name;
 815    nml_name = gfc_get_expr();
 816    nml_name->ref = NULL;
 817    nml_name->expr_type = EXPR_CONSTANT;
 818    nml_name->ts.kind = gfc_default_character_kind ();
 819    nml_name->ts.type = BT_CHARACTER;
 820    nml_name->value.character.length = strlen(name);
 821    nml_name->value.character.string = name;
 822
 823    return nml_name;
 824 }
 825
 826 static gfc_expr *
 827 get_new_var_expr(gfc_symbol * sym)
 828 {
 829   gfc_expr * nml_var;
 830
 831   nml_var = gfc_get_expr();
 832   nml_var->expr_type = EXPR_VARIABLE;
 833   nml_var->ts = sym->ts;
 834   if (sym->as)
 835     nml_var->rank = sym->as->rank;
 836   nml_var->symtree = (gfc_symtree *)gfc_getmem (sizeof (gfc_symtree));
 837   nml_var->symtree->n.sym = sym;
 838   nml_var->where = sym->declared_at;
 839   sym->attr.referenced = 1;
 840
 841   return nml_var;
 842 }
 843
 844
 845 /* Create a data transfer statement.  Not all of the fields are valid
 846    for both reading and writing, but improper use has been filtered
 847    out by now.  */
 848
 849 static tree
 850 build_dt (tree * function, gfc_code * code)
 851 {
 852   stmtblock_t block, post_block;
 853   gfc_dt *dt;
 854   tree tmp, args, arg2;
 855   gfc_expr *nmlname, *nmlvar;
 856   gfc_namelist *nml, *nml_tail;
 857   gfc_se se,se2;
 858   int ts_kind, ts_type, name_len;
 859
 860   gfc_init_block (&block);
 861   gfc_init_block (&post_block);
 862
 863   set_error_locus (&block, &code->loc);
 864   dt = code->ext.dt;
 865
 866   assert (dt != NULL);
 867
 868   if (dt->io_unit)
 869     {
 870       if (dt->io_unit->ts.type == BT_CHARACTER)
 871         {
 872           set_string (&block, &post_block, ioparm_internal_unit,
 873                       ioparm_internal_unit_len, dt->io_unit);
 874         }
 875       else
 876         set_parameter_value (&block, ioparm_unit, dt->io_unit);
 877     }
 878
 879   if (dt->rec)
 880     set_parameter_value (&block, ioparm_rec, dt->rec);
 881
 882   if (dt->advance)
 883     set_string (&block, &post_block, ioparm_advance, ioparm_advance_len,
 884                 dt->advance);
 885
 886   if (dt->format_expr)
 887     set_string (&block, &post_block, ioparm_format, ioparm_format_len,
 888                 dt->format_expr);
 889
 890   if (dt->format_label)
 891     {
 892       if (dt->format_label == &format_asterisk)
 893         set_flag (&block, ioparm_list_format);
 894       else
 895         set_string (&block, &post_block, ioparm_format,
 896                     ioparm_format_len, dt->format_label->format);
 897     }
 898
 899   if (dt->iostat)
 900     set_parameter_ref (&block, ioparm_iostat, dt->iostat);
 901
 902   if (dt->size)
 903     set_parameter_ref (&block, ioparm_size, dt->size);
 904
 905   if (dt->err)
 906     set_flag (&block, ioparm_err);
 907
 908   if (dt->eor)
 909     set_flag(&block, ioparm_eor);
 910
 911   if (dt->end)
 912     set_flag(&block, ioparm_end);
 913
 914   if (dt->namelist)
 915     {
 916        if (dt->format_expr || dt->format_label)
 917           fatal_error("A format cannot be specified with a namelist");
 918
 919        nmlname = gfc_new_nml_name_expr(dt->namelist->name);
 920
 921        set_string (&block, &post_block, ioparm_namelist_name,
 922                 ioparm_namelist_name_len, nmlname);
 923
 924        if (last_dt == READ)
 925           set_flag (&block, ioparm_namelist_read_mode);
 926
 927        nml = dt->namelist->namelist;
 928        nml_tail = dt->namelist->namelist_tail;
 929
 930        while(nml != NULL)
 931        {
 932           gfc_init_se (&se, NULL);
 933           gfc_init_se (&se2, NULL);
 934           nmlvar = get_new_var_expr(nml->sym);
 935           nmlname = gfc_new_nml_name_expr(nml->sym->name);
 936           name_len = strlen(nml->sym->name);
 937           ts_kind = nml->sym->ts.kind;
 938           ts_type = nml->sym->ts.type;
 939
 940           gfc_conv_expr_reference (&se2, nmlname);
 941           gfc_conv_expr_reference (&se, nmlvar);
 942           args = gfc_chainon_list (NULL_TREE, se.expr);
 943           args = gfc_chainon_list (args, se2.expr);
 944           args = gfc_chainon_list (args, se2.string_length);
 945           arg2 = build_int_2 (ts_kind, 0);
 946           args = gfc_chainon_list (args,arg2);
 947           switch (ts_type)
 948             {
 949             case BT_INTEGER:
 950               tmp = gfc_build_function_call (iocall_set_nml_val_int, args);
 951               break;
 952             case BT_CHARACTER:
 953               tmp = gfc_build_function_call (iocall_set_nml_val_char, args);
 954               break;
 955             case BT_REAL:
 956               tmp = gfc_build_function_call (iocall_set_nml_val_float, args);
 957               break;
 958             case BT_LOGICAL:
 959               tmp = gfc_build_function_call (iocall_set_nml_val_log, args);
 960               break;
 961             case BT_COMPLEX:
 962               tmp = gfc_build_function_call (iocall_set_nml_val_complex, args);
 963               break;
 964             default :
 965               internal_error ("Bad namelist IO basetype (%d)", ts_type);
 966             }
 967
 968           gfc_add_expr_to_block (&block, tmp);
 969
 970           nml = nml->next;
 971        }
 972     }
 973
 974   tmp = gfc_build_function_call (*function, NULL_TREE);
 975   gfc_add_expr_to_block (&block, tmp);
 976
 977   gfc_add_block_to_block (&block, &post_block);
 978
 979   return gfc_finish_block (&block);
 980 }
 981
 982
 983 /* Translate the IOLENGTH form of an INQUIRE statement.  We treat
 984    this as a third sort of data transfer statement, except that
 985    lengths are summed instead of actually transfering any data.  */
 986
 987 tree
 988 gfc_trans_iolength (gfc_code * code)
 989 {
 990   stmtblock_t block;
 991   gfc_inquire *inq;
 992   tree dt;
 993
 994   gfc_init_block (&block);
 995
 996   set_error_locus (&block, &code->loc);
 997
 998   inq = code->ext.inquire;
 999
1000   /* First check that preconditions are met.  */
1001   assert(inq != NULL);
1002   assert(inq->iolength != NULL);
1003
1004   /* Connect to the iolength variable.  */
1005   if (inq->iolength)
1006     set_parameter_ref (&block, ioparm_iolength, inq->iolength);
1007
1008   /* Actual logic.  */
1009   last_dt = IOLENGTH;
1010   dt = build_dt(&iocall_iolength, code);
1011
1012   gfc_add_expr_to_block (&block, dt);
1013
1014   return gfc_finish_block (&block);
1015 }
1016
1017
1018 /* Translate a READ statement.  */
1019
1020 tree
1021 gfc_trans_read (gfc_code * code)
1022 {
1023
1024   last_dt = READ;
1025   return build_dt (&iocall_read, code);
1026 }
1027
1028
1029 /* Translate a WRITE statement */
1030
1031 tree
1032 gfc_trans_write (gfc_code * code)
1033 {
1034
1035   last_dt = WRITE;
1036   return build_dt (&iocall_write, code);
1037 }
1038
1039
1040 /* Finish a data transfer statement.  */
1041
1042 tree
1043 gfc_trans_dt_end (gfc_code * code)
1044 {
1045   tree function, tmp;
1046   stmtblock_t block;
1047
1048   gfc_init_block (&block);
1049
1050   switch (last_dt)
1051     {
1052     case READ:
1053       function = iocall_read_done;
1054       break;
1055
1056     case WRITE:
1057       function = iocall_write_done;
1058       break;
1059
1060     case IOLENGTH:
1061       function = iocall_iolength_done;
1062       break;
1063
1064     default:
1065       abort ();
1066     }
1067
1068   tmp = gfc_build_function_call (function, NULL);
1069   gfc_add_expr_to_block (&block, tmp);
1070
1071   if (last_dt != IOLENGTH)
1072     {
1073       assert(code->ext.dt != NULL);
1074       io_result (&block, code->ext.dt->err,
1075                  code->ext.dt->end, code->ext.dt->eor);
1076     }
1077
1078   return gfc_finish_block (&block);
1079 }
1080
1081
1082 /* Generate the call for a scalar transfer node.  */
1083
1084 static void
1085 transfer_expr (gfc_se * se, gfc_typespec * ts, tree addr_expr)
1086 {
1087   tree args, tmp, function, arg2, field, expr;
1088   gfc_component *c;
1089   int kind;
1090
1091   kind = ts->kind;
1092   function = NULL;
1093   arg2 = NULL;
1094
1095   switch (ts->type)
1096     {
1097     case BT_INTEGER:
1098       arg2 = build_int_2 (kind, 0);
1099       function = iocall_x_integer;
1100       break;
1101
1102     case BT_REAL:
1103       arg2 = build_int_2 (kind, 0);
1104       function = iocall_x_real;
1105       break;
1106
1107     case BT_COMPLEX:
1108       arg2 = build_int_2 (kind, 0);
1109       function = iocall_x_complex;
1110       break;
1111
1112     case BT_LOGICAL:
1113       arg2 = build_int_2 (kind, 0);
1114       function = iocall_x_logical;
1115       break;
1116
1117     case BT_CHARACTER:
1118       arg2 = se->string_length;
1119       function = iocall_x_character;
1120       break;
1121
1122     case BT_DERIVED:
1123       expr = gfc_evaluate_now (addr_expr, &se->pre);
1124       expr = gfc_build_indirect_ref (expr);
1125
1126       for (c = ts->derived->components; c; c = c->next)
1127         {
1128           field = c->backend_decl;
1129           assert (field && TREE_CODE (field) == FIELD_DECL);
1130
1131           tmp = build (COMPONENT_REF, TREE_TYPE (field), expr, field,
1132                        NULL_TREE);
1133
1134           if (c->ts.type == BT_CHARACTER)
1135             {
1136               assert (TREE_CODE (TREE_TYPE (tmp)) == ARRAY_TYPE);
1137               se->string_length =
1138                 TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (tmp)));
1139             }
1140           transfer_expr (se, &c->ts, gfc_build_addr_expr (NULL, tmp));
1141         }
1142       return;
1143
1144     default:
1145       internal_error ("Bad IO basetype (%d)", ts->type);
1146     }
1147
1148   args = gfc_chainon_list (NULL_TREE, addr_expr);
1149   args = gfc_chainon_list (args, arg2);
1150
1151   tmp = gfc_build_function_call (function, args);
1152   gfc_add_expr_to_block (&se->pre, tmp);
1153   gfc_add_block_to_block (&se->pre, &se->post);
1154
1155 }
1156
1157
1158 /* gfc_trans_transfer()-- Translate a TRANSFER code node */
1159
1160 tree
1161 gfc_trans_transfer (gfc_code * code)
1162 {
1163   stmtblock_t block, body;
1164   gfc_loopinfo loop;
1165   gfc_expr *expr;
1166   gfc_ss *ss;
1167   gfc_se se;
1168   tree tmp;
1169
1170   gfc_start_block (&block);
1171
1172   expr = code->expr;
1173   ss = gfc_walk_expr (expr);
1174
1175   gfc_init_se (&se, NULL);
1176
1177   if (ss == gfc_ss_terminator)
1178     gfc_init_block (&body);
1179   else
1180     {
1181       /* Initialize the scalarizer.  */
1182       gfc_init_loopinfo (&loop);
1183       gfc_add_ss_to_loop (&loop, ss);
1184
1185       /* Initialize the loop.  */
1186       gfc_conv_ss_startstride (&loop);
1187       gfc_conv_loop_setup (&loop);
1188
1189       /* The main loop body.  */
1190       gfc_mark_ss_chain_used (ss, 1);
1191       gfc_start_scalarized_body (&loop, &body);
1192
1193       gfc_copy_loopinfo_to_se (&se, &loop);
1194       se.ss = ss;
1195     }
1196
1197   gfc_conv_expr_reference (&se, expr);
1198
1199   transfer_expr (&se, &expr->ts, se.expr);
1200
1201   gfc_add_block_to_block (&body, &se.pre);
1202   gfc_add_block_to_block (&body, &se.post);
1203
1204   if (se.ss == NULL)
1205     tmp = gfc_finish_block (&body);
1206   else
1207     {
1208       assert (se.ss == gfc_ss_terminator);
1209       gfc_trans_scalarizing_loops (&loop, &body);
1210
1211       gfc_add_block_to_block (&loop.pre, &loop.post);
1212       tmp = gfc_finish_block (&loop.pre);
1213       gfc_cleanup_loop (&loop);
1214     }
1215
1216   gfc_add_expr_to_block (&block, tmp);
1217
1218   return gfc_finish_block (&block);;
1219 }
1220
1221 #include "gt-fortran-trans-io.h"
1222