1 /* Backend function setup
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software
4 Contributed by Paul Brook
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* trans-decl.c -- Handling of backend function and variable decls, etc */
26 #include "coretypes.h"
28 #include "tree-dump.h"
29 #include "tree-gimple.h"
40 #include "trans-types.h"
41 #include "trans-array.h"
42 #include "trans-const.h"
43 /* Only for gfc_trans_code. Shouldn't need to include this. */
44 #include "trans-stmt.h"
46 #define MAX_LABEL_VALUE 99999
49 /* Holds the result of the function if no result variable specified. */
51 static GTY(()) tree current_fake_result_decl;
52 static GTY(()) tree parent_fake_result_decl;
54 static GTY(()) tree current_function_return_label;
57 /* Holds the variable DECLs for the current function. */
59 static GTY(()) tree saved_function_decls;
60 static GTY(()) tree saved_parent_function_decls;
63 /* The namespace of the module we're currently generating. Only used while
64 outputting decls for module variables. Do not rely on this being set. */
66 static gfc_namespace *module_namespace;
69 /* List of static constructor functions. */
71 tree gfc_static_ctors;
74 /* Function declarations for builtin library functions. */
76 tree gfor_fndecl_internal_realloc;
77 tree gfor_fndecl_allocate;
78 tree gfor_fndecl_allocate_array;
79 tree gfor_fndecl_deallocate;
80 tree gfor_fndecl_pause_numeric;
81 tree gfor_fndecl_pause_string;
82 tree gfor_fndecl_stop_numeric;
83 tree gfor_fndecl_stop_string;
84 tree gfor_fndecl_select_string;
85 tree gfor_fndecl_runtime_error;
86 tree gfor_fndecl_runtime_error_at;
87 tree gfor_fndecl_os_error;
88 tree gfor_fndecl_generate_error;
89 tree gfor_fndecl_set_fpe;
90 tree gfor_fndecl_set_options;
91 tree gfor_fndecl_set_convert;
92 tree gfor_fndecl_set_record_marker;
93 tree gfor_fndecl_set_max_subrecord_length;
94 tree gfor_fndecl_ctime;
95 tree gfor_fndecl_fdate;
96 tree gfor_fndecl_ttynam;
97 tree gfor_fndecl_in_pack;
98 tree gfor_fndecl_in_unpack;
99 tree gfor_fndecl_associated;
102 /* Math functions. Many other math functions are handled in
103 trans-intrinsic.c. */
105 gfc_powdecl_list gfor_fndecl_math_powi[4][3];
106 tree gfor_fndecl_math_cpowf;
107 tree gfor_fndecl_math_cpow;
108 tree gfor_fndecl_math_cpowl10;
109 tree gfor_fndecl_math_cpowl16;
110 tree gfor_fndecl_math_ishftc4;
111 tree gfor_fndecl_math_ishftc8;
112 tree gfor_fndecl_math_ishftc16;
113 tree gfor_fndecl_math_exponent4;
114 tree gfor_fndecl_math_exponent8;
115 tree gfor_fndecl_math_exponent10;
116 tree gfor_fndecl_math_exponent16;
119 /* String functions. */
121 tree gfor_fndecl_compare_string;
122 tree gfor_fndecl_concat_string;
123 tree gfor_fndecl_string_len_trim;
124 tree gfor_fndecl_string_index;
125 tree gfor_fndecl_string_scan;
126 tree gfor_fndecl_string_verify;
127 tree gfor_fndecl_string_trim;
128 tree gfor_fndecl_string_minmax;
129 tree gfor_fndecl_adjustl;
130 tree gfor_fndecl_adjustr;
133 /* Other misc. runtime library functions. */
135 tree gfor_fndecl_size0;
136 tree gfor_fndecl_size1;
137 tree gfor_fndecl_iargc;
139 /* Intrinsic functions implemented in FORTRAN. */
140 tree gfor_fndecl_si_kind;
141 tree gfor_fndecl_sr_kind;
143 /* BLAS gemm functions. */
144 tree gfor_fndecl_sgemm;
145 tree gfor_fndecl_dgemm;
146 tree gfor_fndecl_cgemm;
147 tree gfor_fndecl_zgemm;
151 gfc_add_decl_to_parent_function (tree decl)
154 DECL_CONTEXT (decl) = DECL_CONTEXT (current_function_decl);
155 DECL_NONLOCAL (decl) = 1;
156 TREE_CHAIN (decl) = saved_parent_function_decls;
157 saved_parent_function_decls = decl;
161 gfc_add_decl_to_function (tree decl)
164 TREE_USED (decl) = 1;
165 DECL_CONTEXT (decl) = current_function_decl;
166 TREE_CHAIN (decl) = saved_function_decls;
167 saved_function_decls = decl;
171 /* Build a backend label declaration. Set TREE_USED for named labels.
172 The context of the label is always the current_function_decl. All
173 labels are marked artificial. */
176 gfc_build_label_decl (tree label_id)
178 /* 2^32 temporaries should be enough. */
179 static unsigned int tmp_num = 1;
183 if (label_id == NULL_TREE)
185 /* Build an internal label name. */
186 ASM_FORMAT_PRIVATE_NAME (label_name, "L", tmp_num++);
187 label_id = get_identifier (label_name);
192 /* Build the LABEL_DECL node. Labels have no type. */
193 label_decl = build_decl (LABEL_DECL, label_id, void_type_node);
194 DECL_CONTEXT (label_decl) = current_function_decl;
195 DECL_MODE (label_decl) = VOIDmode;
197 /* We always define the label as used, even if the original source
198 file never references the label. We don't want all kinds of
199 spurious warnings for old-style Fortran code with too many
201 TREE_USED (label_decl) = 1;
203 DECL_ARTIFICIAL (label_decl) = 1;
208 /* Returns the return label for the current function. */
211 gfc_get_return_label (void)
213 char name[GFC_MAX_SYMBOL_LEN + 10];
215 if (current_function_return_label)
216 return current_function_return_label;
218 sprintf (name, "__return_%s",
219 IDENTIFIER_POINTER (DECL_NAME (current_function_decl)));
221 current_function_return_label =
222 gfc_build_label_decl (get_identifier (name));
224 DECL_ARTIFICIAL (current_function_return_label) = 1;
226 return current_function_return_label;
230 /* Set the backend source location of a decl. */
233 gfc_set_decl_location (tree decl, locus * loc)
235 #ifdef USE_MAPPED_LOCATION
236 DECL_SOURCE_LOCATION (decl) = loc->lb->location;
238 DECL_SOURCE_LINE (decl) = loc->lb->linenum;
239 DECL_SOURCE_FILE (decl) = loc->lb->file->filename;
244 /* Return the backend label declaration for a given label structure,
245 or create it if it doesn't exist yet. */
248 gfc_get_label_decl (gfc_st_label * lp)
250 if (lp->backend_decl)
251 return lp->backend_decl;
254 char label_name[GFC_MAX_SYMBOL_LEN + 1];
257 /* Validate the label declaration from the front end. */
258 gcc_assert (lp != NULL && lp->value <= MAX_LABEL_VALUE);
260 /* Build a mangled name for the label. */
261 sprintf (label_name, "__label_%.6d", lp->value);
263 /* Build the LABEL_DECL node. */
264 label_decl = gfc_build_label_decl (get_identifier (label_name));
266 /* Tell the debugger where the label came from. */
267 if (lp->value <= MAX_LABEL_VALUE) /* An internal label. */
268 gfc_set_decl_location (label_decl, &lp->where);
270 DECL_ARTIFICIAL (label_decl) = 1;
272 /* Store the label in the label list and return the LABEL_DECL. */
273 lp->backend_decl = label_decl;
279 /* Convert a gfc_symbol to an identifier of the same name. */
282 gfc_sym_identifier (gfc_symbol * sym)
284 return (get_identifier (sym->name));
288 /* Construct mangled name from symbol name. */
291 gfc_sym_mangled_identifier (gfc_symbol * sym)
293 char name[GFC_MAX_MANGLED_SYMBOL_LEN + 1];
295 /* Prevent the mangling of identifiers that have an assigned
296 binding label (mainly those that are bind(c)). */
297 if (sym->attr.is_bind_c == 1
298 && sym->binding_label[0] != '\0')
299 return get_identifier(sym->binding_label);
301 if (sym->module == NULL)
302 return gfc_sym_identifier (sym);
305 snprintf (name, sizeof name, "__%s_MOD_%s", sym->module, sym->name);
306 return get_identifier (name);
311 /* Construct mangled function name from symbol name. */
314 gfc_sym_mangled_function_id (gfc_symbol * sym)
317 char name[GFC_MAX_MANGLED_SYMBOL_LEN + 1];
319 /* It may be possible to simply use the binding label if it's
320 provided, and remove the other checks. Then we could use it
321 for other things if we wished. */
322 if ((sym->attr.is_bind_c == 1 || sym->attr.is_iso_c == 1) &&
323 sym->binding_label[0] != '\0')
324 /* use the binding label rather than the mangled name */
325 return get_identifier (sym->binding_label);
327 if (sym->module == NULL || sym->attr.proc == PROC_EXTERNAL
328 || (sym->module != NULL && (sym->attr.external
329 || sym->attr.if_source == IFSRC_IFBODY)))
331 if (strcmp (sym->name, "MAIN__") == 0
332 || sym->attr.proc == PROC_INTRINSIC)
333 return get_identifier (sym->name);
335 if (gfc_option.flag_underscoring)
337 has_underscore = strchr (sym->name, '_') != 0;
338 if (gfc_option.flag_second_underscore && has_underscore)
339 snprintf (name, sizeof name, "%s__", sym->name);
341 snprintf (name, sizeof name, "%s_", sym->name);
342 return get_identifier (name);
345 return get_identifier (sym->name);
349 snprintf (name, sizeof name, "__%s_MOD_%s", sym->module, sym->name);
350 return get_identifier (name);
355 /* Returns true if a variable of specified size should go on the stack. */
358 gfc_can_put_var_on_stack (tree size)
360 unsigned HOST_WIDE_INT low;
362 if (!INTEGER_CST_P (size))
365 if (gfc_option.flag_max_stack_var_size < 0)
368 if (TREE_INT_CST_HIGH (size) != 0)
371 low = TREE_INT_CST_LOW (size);
372 if (low > (unsigned HOST_WIDE_INT) gfc_option.flag_max_stack_var_size)
375 /* TODO: Set a per-function stack size limit. */
381 /* gfc_finish_cray_pointee sets DECL_VALUE_EXPR for a Cray pointee to
382 an expression involving its corresponding pointer. There are
383 2 cases; one for variable size arrays, and one for everything else,
384 because variable-sized arrays require one fewer level of
388 gfc_finish_cray_pointee (tree decl, gfc_symbol *sym)
390 tree ptr_decl = gfc_get_symbol_decl (sym->cp_pointer);
393 /* Parameters need to be dereferenced. */
394 if (sym->cp_pointer->attr.dummy)
395 ptr_decl = build_fold_indirect_ref (ptr_decl);
397 /* Check to see if we're dealing with a variable-sized array. */
398 if (sym->attr.dimension
399 && TREE_CODE (TREE_TYPE (decl)) == POINTER_TYPE)
401 /* These decls will be dereferenced later, so we don't dereference
403 value = convert (TREE_TYPE (decl), ptr_decl);
407 ptr_decl = convert (build_pointer_type (TREE_TYPE (decl)),
409 value = build_fold_indirect_ref (ptr_decl);
412 SET_DECL_VALUE_EXPR (decl, value);
413 DECL_HAS_VALUE_EXPR_P (decl) = 1;
414 GFC_DECL_CRAY_POINTEE (decl) = 1;
415 /* This is a fake variable just for debugging purposes. */
416 TREE_ASM_WRITTEN (decl) = 1;
420 /* Finish processing of a declaration without an initial value. */
423 gfc_finish_decl (tree decl)
425 gcc_assert (TREE_CODE (decl) == PARM_DECL
426 || DECL_INITIAL (decl) == NULL_TREE);
428 if (TREE_CODE (decl) != VAR_DECL)
431 if (DECL_SIZE (decl) == NULL_TREE
432 && TYPE_SIZE (TREE_TYPE (decl)) != NULL_TREE)
433 layout_decl (decl, 0);
435 /* A few consistency checks. */
436 /* A static variable with an incomplete type is an error if it is
437 initialized. Also if it is not file scope. Otherwise, let it
438 through, but if it is not `extern' then it may cause an error
440 /* An automatic variable with an incomplete type is an error. */
442 /* We should know the storage size. */
443 gcc_assert (DECL_SIZE (decl) != NULL_TREE
444 || (TREE_STATIC (decl)
445 ? (!DECL_INITIAL (decl) || !DECL_CONTEXT (decl))
446 : DECL_EXTERNAL (decl)));
448 /* The storage size should be constant. */
449 gcc_assert ((!DECL_EXTERNAL (decl) && !TREE_STATIC (decl))
451 || TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST);
455 /* Apply symbol attributes to a variable, and add it to the function scope. */
458 gfc_finish_var_decl (tree decl, gfc_symbol * sym)
461 /* TREE_ADDRESSABLE means the address of this variable is actually needed.
462 This is the equivalent of the TARGET variables.
463 We also need to set this if the variable is passed by reference in a
466 /* Set DECL_VALUE_EXPR for Cray Pointees. */
467 if (sym->attr.cray_pointee)
468 gfc_finish_cray_pointee (decl, sym);
470 if (sym->attr.target)
471 TREE_ADDRESSABLE (decl) = 1;
472 /* If it wasn't used we wouldn't be getting it. */
473 TREE_USED (decl) = 1;
475 /* Chain this decl to the pending declarations. Don't do pushdecl()
476 because this would add them to the current scope rather than the
478 if (current_function_decl != NULL_TREE)
480 if (sym->ns->proc_name->backend_decl == current_function_decl
481 || sym->result == sym)
482 gfc_add_decl_to_function (decl);
484 gfc_add_decl_to_parent_function (decl);
487 if (sym->attr.cray_pointee)
490 if(sym->attr.is_bind_c == 1)
492 /* We need to put variables that are bind(c) into the common
493 segment of the object file, because this is what C would do.
494 gfortran would typically put them in either the BSS or
495 initialized data segments, and only mark them as common if
496 they were part of common blocks. However, if they are not put
497 into common space, then C cannot initialize global fortran
498 variables that it interoperates with and the draft says that
499 either Fortran or C should be able to initialize it (but not
500 both, of course.) (J3/04-007, section 15.3). */
501 TREE_PUBLIC(decl) = 1;
502 DECL_COMMON(decl) = 1;
505 /* If a variable is USE associated, it's always external. */
506 if (sym->attr.use_assoc)
508 DECL_EXTERNAL (decl) = 1;
509 TREE_PUBLIC (decl) = 1;
511 else if (sym->module && !sym->attr.result && !sym->attr.dummy)
513 /* TODO: Don't set sym->module for result or dummy variables. */
514 gcc_assert (current_function_decl == NULL_TREE || sym->result == sym);
515 /* This is the declaration of a module variable. */
516 TREE_PUBLIC (decl) = 1;
517 TREE_STATIC (decl) = 1;
520 if ((sym->attr.save || sym->attr.data || sym->value)
521 && !sym->attr.use_assoc)
522 TREE_STATIC (decl) = 1;
524 if (sym->attr.volatile_)
526 TREE_THIS_VOLATILE (decl) = 1;
527 new = build_qualified_type (TREE_TYPE (decl), TYPE_QUAL_VOLATILE);
528 TREE_TYPE (decl) = new;
531 /* Keep variables larger than max-stack-var-size off stack. */
532 if (!sym->ns->proc_name->attr.recursive
533 && INTEGER_CST_P (DECL_SIZE_UNIT (decl))
534 && !gfc_can_put_var_on_stack (DECL_SIZE_UNIT (decl))
535 /* Put variable length auto array pointers always into stack. */
536 && (TREE_CODE (TREE_TYPE (decl)) != POINTER_TYPE
537 || sym->attr.dimension == 0
538 || sym->as->type != AS_EXPLICIT
540 || sym->attr.allocatable)
541 && !DECL_ARTIFICIAL (decl))
542 TREE_STATIC (decl) = 1;
544 /* Handle threadprivate variables. */
545 if (sym->attr.threadprivate
546 && (TREE_STATIC (decl) || DECL_EXTERNAL (decl)))
547 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
551 /* Allocate the lang-specific part of a decl. */
554 gfc_allocate_lang_decl (tree decl)
556 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
557 ggc_alloc_cleared (sizeof (struct lang_decl));
560 /* Remember a symbol to generate initialization/cleanup code at function
564 gfc_defer_symbol_init (gfc_symbol * sym)
570 /* Don't add a symbol twice. */
574 last = head = sym->ns->proc_name;
577 /* Make sure that setup code for dummy variables which are used in the
578 setup of other variables is generated first. */
581 /* Find the first dummy arg seen after us, or the first non-dummy arg.
582 This is a circular list, so don't go past the head. */
584 && (!p->attr.dummy || p->dummy_order > sym->dummy_order))
590 /* Insert in between last and p. */
596 /* Create an array index type variable with function scope. */
599 create_index_var (const char * pfx, int nest)
603 decl = gfc_create_var_np (gfc_array_index_type, pfx);
605 gfc_add_decl_to_parent_function (decl);
607 gfc_add_decl_to_function (decl);
612 /* Create variables to hold all the non-constant bits of info for a
613 descriptorless array. Remember these in the lang-specific part of the
617 gfc_build_qualified_array (tree decl, gfc_symbol * sym)
623 type = TREE_TYPE (decl);
625 /* We just use the descriptor, if there is one. */
626 if (GFC_DESCRIPTOR_TYPE_P (type))
629 gcc_assert (GFC_ARRAY_TYPE_P (type));
630 nest = (sym->ns->proc_name->backend_decl != current_function_decl)
631 && !sym->attr.contained;
633 for (dim = 0; dim < GFC_TYPE_ARRAY_RANK (type); dim++)
635 if (GFC_TYPE_ARRAY_LBOUND (type, dim) == NULL_TREE)
637 GFC_TYPE_ARRAY_LBOUND (type, dim) = create_index_var ("lbound", nest);
638 TREE_NO_WARNING (GFC_TYPE_ARRAY_LBOUND (type, dim)) = 1;
640 /* Don't try to use the unknown bound for assumed shape arrays. */
641 if (GFC_TYPE_ARRAY_UBOUND (type, dim) == NULL_TREE
642 && (sym->as->type != AS_ASSUMED_SIZE
643 || dim < GFC_TYPE_ARRAY_RANK (type) - 1))
645 GFC_TYPE_ARRAY_UBOUND (type, dim) = create_index_var ("ubound", nest);
646 TREE_NO_WARNING (GFC_TYPE_ARRAY_UBOUND (type, dim)) = 1;
649 if (GFC_TYPE_ARRAY_STRIDE (type, dim) == NULL_TREE)
651 GFC_TYPE_ARRAY_STRIDE (type, dim) = create_index_var ("stride", nest);
652 TREE_NO_WARNING (GFC_TYPE_ARRAY_STRIDE (type, dim)) = 1;
655 if (GFC_TYPE_ARRAY_OFFSET (type) == NULL_TREE)
657 GFC_TYPE_ARRAY_OFFSET (type) = gfc_create_var_np (gfc_array_index_type,
659 TREE_NO_WARNING (GFC_TYPE_ARRAY_OFFSET (type)) = 1;
662 gfc_add_decl_to_parent_function (GFC_TYPE_ARRAY_OFFSET (type));
664 gfc_add_decl_to_function (GFC_TYPE_ARRAY_OFFSET (type));
667 if (GFC_TYPE_ARRAY_SIZE (type) == NULL_TREE
668 && sym->as->type != AS_ASSUMED_SIZE)
670 GFC_TYPE_ARRAY_SIZE (type) = create_index_var ("size", nest);
671 TREE_NO_WARNING (GFC_TYPE_ARRAY_SIZE (type)) = 1;
674 if (POINTER_TYPE_P (type))
676 gcc_assert (GFC_ARRAY_TYPE_P (TREE_TYPE (type)));
677 gcc_assert (TYPE_LANG_SPECIFIC (type)
678 == TYPE_LANG_SPECIFIC (TREE_TYPE (type)));
679 type = TREE_TYPE (type);
682 if (! COMPLETE_TYPE_P (type) && GFC_TYPE_ARRAY_SIZE (type))
686 size = build2 (MINUS_EXPR, gfc_array_index_type,
687 GFC_TYPE_ARRAY_SIZE (type), gfc_index_one_node);
688 range = build_range_type (gfc_array_index_type, gfc_index_zero_node,
690 TYPE_DOMAIN (type) = range;
696 /* For some dummy arguments we don't use the actual argument directly.
697 Instead we create a local decl and use that. This allows us to perform
698 initialization, and construct full type information. */
701 gfc_build_dummy_array_decl (gfc_symbol * sym, tree dummy)
711 if (sym->attr.pointer || sym->attr.allocatable)
714 /* Add to list of variables if not a fake result variable. */
715 if (sym->attr.result || sym->attr.dummy)
716 gfc_defer_symbol_init (sym);
718 type = TREE_TYPE (dummy);
719 gcc_assert (TREE_CODE (dummy) == PARM_DECL
720 && POINTER_TYPE_P (type));
722 /* Do we know the element size? */
723 known_size = sym->ts.type != BT_CHARACTER
724 || INTEGER_CST_P (sym->ts.cl->backend_decl);
726 if (known_size && !GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (type)))
728 /* For descriptorless arrays with known element size the actual
729 argument is sufficient. */
730 gcc_assert (GFC_ARRAY_TYPE_P (type));
731 gfc_build_qualified_array (dummy, sym);
735 type = TREE_TYPE (type);
736 if (GFC_DESCRIPTOR_TYPE_P (type))
738 /* Create a descriptorless array pointer. */
741 if (!gfc_option.flag_repack_arrays)
743 if (as->type == AS_ASSUMED_SIZE)
744 packed = PACKED_FULL;
748 if (as->type == AS_EXPLICIT)
750 packed = PACKED_FULL;
751 for (n = 0; n < as->rank; n++)
755 && as->upper[n]->expr_type == EXPR_CONSTANT
756 && as->lower[n]->expr_type == EXPR_CONSTANT))
757 packed = PACKED_PARTIAL;
761 packed = PACKED_PARTIAL;
764 type = gfc_typenode_for_spec (&sym->ts);
765 type = gfc_get_nodesc_array_type (type, sym->as, packed);
769 /* We now have an expression for the element size, so create a fully
770 qualified type. Reset sym->backend decl or this will just return the
772 DECL_ARTIFICIAL (sym->backend_decl) = 1;
773 sym->backend_decl = NULL_TREE;
774 type = gfc_sym_type (sym);
775 packed = PACKED_FULL;
778 ASM_FORMAT_PRIVATE_NAME (name, IDENTIFIER_POINTER (DECL_NAME (dummy)), 0);
779 decl = build_decl (VAR_DECL, get_identifier (name), type);
781 DECL_ARTIFICIAL (decl) = 1;
782 TREE_PUBLIC (decl) = 0;
783 TREE_STATIC (decl) = 0;
784 DECL_EXTERNAL (decl) = 0;
786 /* We should never get deferred shape arrays here. We used to because of
788 gcc_assert (sym->as->type != AS_DEFERRED);
790 if (packed == PACKED_PARTIAL)
791 GFC_DECL_PARTIAL_PACKED_ARRAY (decl) = 1;
792 else if (packed == PACKED_FULL)
793 GFC_DECL_PACKED_ARRAY (decl) = 1;
795 gfc_build_qualified_array (decl, sym);
797 if (DECL_LANG_SPECIFIC (dummy))
798 DECL_LANG_SPECIFIC (decl) = DECL_LANG_SPECIFIC (dummy);
800 gfc_allocate_lang_decl (decl);
802 GFC_DECL_SAVED_DESCRIPTOR (decl) = dummy;
804 if (sym->ns->proc_name->backend_decl == current_function_decl
805 || sym->attr.contained)
806 gfc_add_decl_to_function (decl);
808 gfc_add_decl_to_parent_function (decl);
814 /* Return a constant or a variable to use as a string length. Does not
815 add the decl to the current scope. */
818 gfc_create_string_length (gfc_symbol * sym)
822 gcc_assert (sym->ts.cl);
823 gfc_conv_const_charlen (sym->ts.cl);
825 if (sym->ts.cl->backend_decl == NULL_TREE)
827 char name[GFC_MAX_MANGLED_SYMBOL_LEN + 2];
829 /* Also prefix the mangled name. */
830 strcpy (&name[1], sym->name);
832 length = build_decl (VAR_DECL, get_identifier (name),
833 gfc_charlen_type_node);
834 DECL_ARTIFICIAL (length) = 1;
835 TREE_USED (length) = 1;
836 if (sym->ns->proc_name->tlink != NULL)
837 gfc_defer_symbol_init (sym);
838 sym->ts.cl->backend_decl = length;
841 return sym->ts.cl->backend_decl;
844 /* If a variable is assigned a label, we add another two auxiliary
848 gfc_add_assign_aux_vars (gfc_symbol * sym)
854 gcc_assert (sym->backend_decl);
856 decl = sym->backend_decl;
857 gfc_allocate_lang_decl (decl);
858 GFC_DECL_ASSIGN (decl) = 1;
859 length = build_decl (VAR_DECL, create_tmp_var_name (sym->name),
860 gfc_charlen_type_node);
861 addr = build_decl (VAR_DECL, create_tmp_var_name (sym->name),
863 gfc_finish_var_decl (length, sym);
864 gfc_finish_var_decl (addr, sym);
865 /* STRING_LENGTH is also used as flag. Less than -1 means that
866 ASSIGN_ADDR can not be used. Equal -1 means that ASSIGN_ADDR is the
867 target label's address. Otherwise, value is the length of a format string
868 and ASSIGN_ADDR is its address. */
869 if (TREE_STATIC (length))
870 DECL_INITIAL (length) = build_int_cst (NULL_TREE, -2);
872 gfc_defer_symbol_init (sym);
874 GFC_DECL_STRING_LEN (decl) = length;
875 GFC_DECL_ASSIGN_ADDR (decl) = addr;
878 /* Return the decl for a gfc_symbol, create it if it doesn't already
882 gfc_get_symbol_decl (gfc_symbol * sym)
885 tree length = NULL_TREE;
888 gcc_assert (sym->attr.referenced
889 || sym->attr.use_assoc
890 || sym->ns->proc_name->attr.if_source == IFSRC_IFBODY);
892 if (sym->ns && sym->ns->proc_name->attr.function)
893 byref = gfc_return_by_reference (sym->ns->proc_name);
897 if ((sym->attr.dummy && ! sym->attr.function) || (sym->attr.result && byref))
899 /* Return via extra parameter. */
900 if (sym->attr.result && byref
901 && !sym->backend_decl)
904 DECL_ARGUMENTS (sym->ns->proc_name->backend_decl);
905 /* For entry master function skip over the __entry
907 if (sym->ns->proc_name->attr.entry_master)
908 sym->backend_decl = TREE_CHAIN (sym->backend_decl);
911 /* Dummy variables should already have been created. */
912 gcc_assert (sym->backend_decl);
914 /* Create a character length variable. */
915 if (sym->ts.type == BT_CHARACTER)
917 if (sym->ts.cl->backend_decl == NULL_TREE)
918 length = gfc_create_string_length (sym);
920 length = sym->ts.cl->backend_decl;
921 if (TREE_CODE (length) == VAR_DECL
922 && DECL_CONTEXT (length) == NULL_TREE)
924 /* Add the string length to the same context as the symbol. */
925 if (DECL_CONTEXT (sym->backend_decl) == current_function_decl)
926 gfc_add_decl_to_function (length);
928 gfc_add_decl_to_parent_function (length);
930 gcc_assert (DECL_CONTEXT (sym->backend_decl) ==
931 DECL_CONTEXT (length));
933 gfc_defer_symbol_init (sym);
937 /* Use a copy of the descriptor for dummy arrays. */
938 if (sym->attr.dimension && !TREE_USED (sym->backend_decl))
940 decl = gfc_build_dummy_array_decl (sym, sym->backend_decl);
941 /* Prevent the dummy from being detected as unused if it is copied. */
942 if (sym->backend_decl != NULL && decl != sym->backend_decl)
943 DECL_ARTIFICIAL (sym->backend_decl) = 1;
944 sym->backend_decl = decl;
947 TREE_USED (sym->backend_decl) = 1;
948 if (sym->attr.assign && GFC_DECL_ASSIGN (sym->backend_decl) == 0)
950 gfc_add_assign_aux_vars (sym);
952 return sym->backend_decl;
955 if (sym->backend_decl)
956 return sym->backend_decl;
958 /* Catch function declarations. Only used for actual parameters. */
959 if (sym->attr.flavor == FL_PROCEDURE)
961 decl = gfc_get_extern_function_decl (sym);
965 if (sym->attr.intrinsic)
966 internal_error ("intrinsic variable which isn't a procedure");
968 /* Create string length decl first so that they can be used in the
970 if (sym->ts.type == BT_CHARACTER)
971 length = gfc_create_string_length (sym);
973 /* Create the decl for the variable. */
974 decl = build_decl (VAR_DECL, gfc_sym_identifier (sym), gfc_sym_type (sym));
976 gfc_set_decl_location (decl, &sym->declared_at);
978 /* Symbols from modules should have their assembler names mangled.
979 This is done here rather than in gfc_finish_var_decl because it
980 is different for string length variables. */
982 SET_DECL_ASSEMBLER_NAME (decl, gfc_sym_mangled_identifier (sym));
984 if (sym->attr.dimension)
986 /* Create variables to hold the non-constant bits of array info. */
987 gfc_build_qualified_array (decl, sym);
989 /* Remember this variable for allocation/cleanup. */
990 gfc_defer_symbol_init (sym);
992 if ((sym->attr.allocatable || !sym->attr.dummy) && !sym->attr.pointer)
993 GFC_DECL_PACKED_ARRAY (decl) = 1;
996 if (sym->ts.type == BT_DERIVED && sym->ts.derived->attr.alloc_comp)
997 gfc_defer_symbol_init (sym);
999 gfc_finish_var_decl (decl, sym);
1001 if (sym->ts.type == BT_CHARACTER)
1003 /* Character variables need special handling. */
1004 gfc_allocate_lang_decl (decl);
1006 if (TREE_CODE (length) != INTEGER_CST)
1008 char name[GFC_MAX_MANGLED_SYMBOL_LEN + 2];
1012 /* Also prefix the mangled name for symbols from modules. */
1013 strcpy (&name[1], sym->name);
1016 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (length)));
1017 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (name));
1019 gfc_finish_var_decl (length, sym);
1020 gcc_assert (!sym->value);
1023 sym->backend_decl = decl;
1025 if (sym->attr.assign)
1026 gfc_add_assign_aux_vars (sym);
1028 if (TREE_STATIC (decl) && !sym->attr.use_assoc)
1030 /* Add static initializer. */
1031 DECL_INITIAL (decl) = gfc_conv_initializer (sym->value, &sym->ts,
1032 TREE_TYPE (decl), sym->attr.dimension,
1033 sym->attr.pointer || sym->attr.allocatable);
1040 /* Substitute a temporary variable in place of the real one. */
1043 gfc_shadow_sym (gfc_symbol * sym, tree decl, gfc_saved_var * save)
1045 save->attr = sym->attr;
1046 save->decl = sym->backend_decl;
1048 gfc_clear_attr (&sym->attr);
1049 sym->attr.referenced = 1;
1050 sym->attr.flavor = FL_VARIABLE;
1052 sym->backend_decl = decl;
1056 /* Restore the original variable. */
1059 gfc_restore_sym (gfc_symbol * sym, gfc_saved_var * save)
1061 sym->attr = save->attr;
1062 sym->backend_decl = save->decl;
1066 /* Get a basic decl for an external function. */
1069 gfc_get_extern_function_decl (gfc_symbol * sym)
1074 gfc_intrinsic_sym *isym;
1076 char s[GFC_MAX_SYMBOL_LEN + 23]; /* "_gfortran_f2c_specific" and '\0'. */
1080 if (sym->backend_decl)
1081 return sym->backend_decl;
1083 /* We should never be creating external decls for alternate entry points.
1084 The procedure may be an alternate entry point, but we don't want/need
1086 gcc_assert (!(sym->attr.entry || sym->attr.entry_master));
1088 if (sym->attr.intrinsic)
1090 /* Call the resolution function to get the actual name. This is
1091 a nasty hack which relies on the resolution functions only looking
1092 at the first argument. We pass NULL for the second argument
1093 otherwise things like AINT get confused. */
1094 isym = gfc_find_function (sym->name);
1095 gcc_assert (isym->resolve.f0 != NULL);
1097 memset (&e, 0, sizeof (e));
1098 e.expr_type = EXPR_FUNCTION;
1100 memset (&argexpr, 0, sizeof (argexpr));
1101 gcc_assert (isym->formal);
1102 argexpr.ts = isym->formal->ts;
1104 if (isym->formal->next == NULL)
1105 isym->resolve.f1 (&e, &argexpr);
1108 if (isym->formal->next->next == NULL)
1109 isym->resolve.f2 (&e, &argexpr, NULL);
1112 /* All specific intrinsics take less than 4 arguments. */
1113 gcc_assert (isym->formal->next->next->next == NULL);
1114 isym->resolve.f3 (&e, &argexpr, NULL, NULL);
1118 if (gfc_option.flag_f2c
1119 && ((e.ts.type == BT_REAL && e.ts.kind == gfc_default_real_kind)
1120 || e.ts.type == BT_COMPLEX))
1122 /* Specific which needs a different implementation if f2c
1123 calling conventions are used. */
1124 sprintf (s, "_gfortran_f2c_specific%s", e.value.function.name);
1127 sprintf (s, "_gfortran_specific%s", e.value.function.name);
1129 name = get_identifier (s);
1130 mangled_name = name;
1134 name = gfc_sym_identifier (sym);
1135 mangled_name = gfc_sym_mangled_function_id (sym);
1138 type = gfc_get_function_type (sym);
1139 fndecl = build_decl (FUNCTION_DECL, name, type);
1141 SET_DECL_ASSEMBLER_NAME (fndecl, mangled_name);
1142 /* If the return type is a pointer, avoid alias issues by setting
1143 DECL_IS_MALLOC to nonzero. This means that the function should be
1144 treated as if it were a malloc, meaning it returns a pointer that
1146 if (POINTER_TYPE_P (type))
1147 DECL_IS_MALLOC (fndecl) = 1;
1149 /* Set the context of this decl. */
1150 if (0 && sym->ns && sym->ns->proc_name)
1152 /* TODO: Add external decls to the appropriate scope. */
1153 DECL_CONTEXT (fndecl) = sym->ns->proc_name->backend_decl;
1157 /* Global declaration, e.g. intrinsic subroutine. */
1158 DECL_CONTEXT (fndecl) = NULL_TREE;
1161 DECL_EXTERNAL (fndecl) = 1;
1163 /* This specifies if a function is globally addressable, i.e. it is
1164 the opposite of declaring static in C. */
1165 TREE_PUBLIC (fndecl) = 1;
1167 /* Set attributes for PURE functions. A call to PURE function in the
1168 Fortran 95 sense is both pure and without side effects in the C
1170 if (sym->attr.pure || sym->attr.elemental)
1172 if (sym->attr.function && !gfc_return_by_reference (sym))
1173 DECL_IS_PURE (fndecl) = 1;
1174 /* TODO: check if pure SUBROUTINEs don't have INTENT(OUT)
1175 parameters and don't use alternate returns (is this
1176 allowed?). In that case, calls to them are meaningless, and
1177 can be optimized away. See also in build_function_decl(). */
1178 TREE_SIDE_EFFECTS (fndecl) = 0;
1181 /* Mark non-returning functions. */
1182 if (sym->attr.noreturn)
1183 TREE_THIS_VOLATILE(fndecl) = 1;
1185 sym->backend_decl = fndecl;
1187 if (DECL_CONTEXT (fndecl) == NULL_TREE)
1188 pushdecl_top_level (fndecl);
1194 /* Create a declaration for a procedure. For external functions (in the C
1195 sense) use gfc_get_extern_function_decl. HAS_ENTRIES is true if this is
1196 a master function with alternate entry points. */
1199 build_function_decl (gfc_symbol * sym)
1202 symbol_attribute attr;
1204 gfc_formal_arglist *f;
1206 gcc_assert (!sym->backend_decl);
1207 gcc_assert (!sym->attr.external);
1209 /* Set the line and filename. sym->declared_at seems to point to the
1210 last statement for subroutines, but it'll do for now. */
1211 gfc_set_backend_locus (&sym->declared_at);
1213 /* Allow only one nesting level. Allow public declarations. */
1214 gcc_assert (current_function_decl == NULL_TREE
1215 || DECL_CONTEXT (current_function_decl) == NULL_TREE);
1217 type = gfc_get_function_type (sym);
1218 fndecl = build_decl (FUNCTION_DECL, gfc_sym_identifier (sym), type);
1220 /* Perform name mangling if this is a top level or module procedure. */
1221 if (current_function_decl == NULL_TREE)
1222 SET_DECL_ASSEMBLER_NAME (fndecl, gfc_sym_mangled_function_id (sym));
1224 /* Figure out the return type of the declared function, and build a
1225 RESULT_DECL for it. If this is a subroutine with alternate
1226 returns, build a RESULT_DECL for it. */
1229 result_decl = NULL_TREE;
1230 /* TODO: Shouldn't this just be TREE_TYPE (TREE_TYPE (fndecl)). */
1233 if (gfc_return_by_reference (sym))
1234 type = void_type_node;
1237 if (sym->result != sym)
1238 result_decl = gfc_sym_identifier (sym->result);
1240 type = TREE_TYPE (TREE_TYPE (fndecl));
1245 /* Look for alternate return placeholders. */
1246 int has_alternate_returns = 0;
1247 for (f = sym->formal; f; f = f->next)
1251 has_alternate_returns = 1;
1256 if (has_alternate_returns)
1257 type = integer_type_node;
1259 type = void_type_node;
1262 result_decl = build_decl (RESULT_DECL, result_decl, type);
1263 DECL_ARTIFICIAL (result_decl) = 1;
1264 DECL_IGNORED_P (result_decl) = 1;
1265 DECL_CONTEXT (result_decl) = fndecl;
1266 DECL_RESULT (fndecl) = result_decl;
1268 /* Don't call layout_decl for a RESULT_DECL.
1269 layout_decl (result_decl, 0); */
1271 /* If the return type is a pointer, avoid alias issues by setting
1272 DECL_IS_MALLOC to nonzero. This means that the function should be
1273 treated as if it were a malloc, meaning it returns a pointer that
1275 if (POINTER_TYPE_P (type))
1276 DECL_IS_MALLOC (fndecl) = 1;
1278 /* Set up all attributes for the function. */
1279 DECL_CONTEXT (fndecl) = current_function_decl;
1280 DECL_EXTERNAL (fndecl) = 0;
1282 /* This specifies if a function is globally visible, i.e. it is
1283 the opposite of declaring static in C. */
1284 if (DECL_CONTEXT (fndecl) == NULL_TREE
1285 && !sym->attr.entry_master)
1286 TREE_PUBLIC (fndecl) = 1;
1288 /* TREE_STATIC means the function body is defined here. */
1289 TREE_STATIC (fndecl) = 1;
1291 /* Set attributes for PURE functions. A call to a PURE function in the
1292 Fortran 95 sense is both pure and without side effects in the C
1294 if (attr.pure || attr.elemental)
1296 /* TODO: check if a pure SUBROUTINE has no INTENT(OUT) arguments
1297 including an alternate return. In that case it can also be
1298 marked as PURE. See also in gfc_get_extern_function_decl(). */
1299 if (attr.function && !gfc_return_by_reference (sym))
1300 DECL_IS_PURE (fndecl) = 1;
1301 TREE_SIDE_EFFECTS (fndecl) = 0;
1304 /* Layout the function declaration and put it in the binding level
1305 of the current function. */
1308 sym->backend_decl = fndecl;
1312 /* Create the DECL_ARGUMENTS for a procedure. */
1315 create_function_arglist (gfc_symbol * sym)
1318 gfc_formal_arglist *f;
1319 tree typelist, hidden_typelist;
1320 tree arglist, hidden_arglist;
1324 fndecl = sym->backend_decl;
1326 /* Build formal argument list. Make sure that their TREE_CONTEXT is
1327 the new FUNCTION_DECL node. */
1328 arglist = NULL_TREE;
1329 hidden_arglist = NULL_TREE;
1330 typelist = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
1332 if (sym->attr.entry_master)
1334 type = TREE_VALUE (typelist);
1335 parm = build_decl (PARM_DECL, get_identifier ("__entry"), type);
1337 DECL_CONTEXT (parm) = fndecl;
1338 DECL_ARG_TYPE (parm) = type;
1339 TREE_READONLY (parm) = 1;
1340 gfc_finish_decl (parm);
1341 DECL_ARTIFICIAL (parm) = 1;
1343 arglist = chainon (arglist, parm);
1344 typelist = TREE_CHAIN (typelist);
1347 if (gfc_return_by_reference (sym))
1349 tree type = TREE_VALUE (typelist), length = NULL;
1351 if (sym->ts.type == BT_CHARACTER)
1353 /* Length of character result. */
1354 tree len_type = TREE_VALUE (TREE_CHAIN (typelist));
1355 gcc_assert (len_type == gfc_charlen_type_node);
1357 length = build_decl (PARM_DECL,
1358 get_identifier (".__result"),
1360 if (!sym->ts.cl->length)
1362 sym->ts.cl->backend_decl = length;
1363 TREE_USED (length) = 1;
1365 gcc_assert (TREE_CODE (length) == PARM_DECL);
1366 DECL_CONTEXT (length) = fndecl;
1367 DECL_ARG_TYPE (length) = len_type;
1368 TREE_READONLY (length) = 1;
1369 DECL_ARTIFICIAL (length) = 1;
1370 gfc_finish_decl (length);
1371 if (sym->ts.cl->backend_decl == NULL
1372 || sym->ts.cl->backend_decl == length)
1377 if (sym->ts.cl->backend_decl == NULL)
1379 tree len = build_decl (VAR_DECL,
1380 get_identifier ("..__result"),
1381 gfc_charlen_type_node);
1382 DECL_ARTIFICIAL (len) = 1;
1383 TREE_USED (len) = 1;
1384 sym->ts.cl->backend_decl = len;
1387 /* Make sure PARM_DECL type doesn't point to incomplete type. */
1388 arg = sym->result ? sym->result : sym;
1389 backend_decl = arg->backend_decl;
1390 /* Temporary clear it, so that gfc_sym_type creates complete
1392 arg->backend_decl = NULL;
1393 type = gfc_sym_type (arg);
1394 arg->backend_decl = backend_decl;
1395 type = build_reference_type (type);
1399 parm = build_decl (PARM_DECL, get_identifier ("__result"), type);
1401 DECL_CONTEXT (parm) = fndecl;
1402 DECL_ARG_TYPE (parm) = TREE_VALUE (typelist);
1403 TREE_READONLY (parm) = 1;
1404 DECL_ARTIFICIAL (parm) = 1;
1405 gfc_finish_decl (parm);
1407 arglist = chainon (arglist, parm);
1408 typelist = TREE_CHAIN (typelist);
1410 if (sym->ts.type == BT_CHARACTER)
1412 gfc_allocate_lang_decl (parm);
1413 arglist = chainon (arglist, length);
1414 typelist = TREE_CHAIN (typelist);
1418 hidden_typelist = typelist;
1419 for (f = sym->formal; f; f = f->next)
1420 if (f->sym != NULL) /* Ignore alternate returns. */
1421 hidden_typelist = TREE_CHAIN (hidden_typelist);
1423 for (f = sym->formal; f; f = f->next)
1425 char name[GFC_MAX_SYMBOL_LEN + 2];
1427 /* Ignore alternate returns. */
1431 type = TREE_VALUE (typelist);
1433 if (f->sym->ts.type == BT_CHARACTER)
1435 tree len_type = TREE_VALUE (hidden_typelist);
1436 tree length = NULL_TREE;
1437 gcc_assert (len_type == gfc_charlen_type_node);
1439 strcpy (&name[1], f->sym->name);
1441 length = build_decl (PARM_DECL, get_identifier (name), len_type);
1443 hidden_arglist = chainon (hidden_arglist, length);
1444 DECL_CONTEXT (length) = fndecl;
1445 DECL_ARTIFICIAL (length) = 1;
1446 DECL_ARG_TYPE (length) = len_type;
1447 TREE_READONLY (length) = 1;
1448 gfc_finish_decl (length);
1450 /* TODO: Check string lengths when -fbounds-check. */
1452 /* Use the passed value for assumed length variables. */
1453 if (!f->sym->ts.cl->length)
1455 TREE_USED (length) = 1;
1456 if (!f->sym->ts.cl->backend_decl)
1457 f->sym->ts.cl->backend_decl = length;
1460 /* there is already another variable using this
1461 gfc_charlen node, build a new one for this variable
1462 and chain it into the list of gfc_charlens.
1463 This happens for e.g. in the case
1465 since CHARACTER declarations on the same line share
1466 the same gfc_charlen node. */
1469 cl = gfc_get_charlen ();
1470 cl->backend_decl = length;
1471 cl->next = f->sym->ts.cl->next;
1472 f->sym->ts.cl->next = cl;
1477 hidden_typelist = TREE_CHAIN (hidden_typelist);
1479 if (f->sym->ts.cl->backend_decl == NULL
1480 || f->sym->ts.cl->backend_decl == length)
1482 if (f->sym->ts.cl->backend_decl == NULL)
1483 gfc_create_string_length (f->sym);
1485 /* Make sure PARM_DECL type doesn't point to incomplete type. */
1486 if (f->sym->attr.flavor == FL_PROCEDURE)
1487 type = build_pointer_type (gfc_get_function_type (f->sym));
1489 type = gfc_sym_type (f->sym);
1493 /* For non-constant length array arguments, make sure they use
1494 a different type node from TYPE_ARG_TYPES type. */
1495 if (f->sym->attr.dimension
1496 && type == TREE_VALUE (typelist)
1497 && TREE_CODE (type) == POINTER_TYPE
1498 && GFC_ARRAY_TYPE_P (type)
1499 && f->sym->as->type != AS_ASSUMED_SIZE
1500 && ! COMPLETE_TYPE_P (TREE_TYPE (type)))
1502 if (f->sym->attr.flavor == FL_PROCEDURE)
1503 type = build_pointer_type (gfc_get_function_type (f->sym));
1505 type = gfc_sym_type (f->sym);
1508 /* Build a the argument declaration. */
1509 parm = build_decl (PARM_DECL, gfc_sym_identifier (f->sym), type);
1511 /* Fill in arg stuff. */
1512 DECL_CONTEXT (parm) = fndecl;
1513 DECL_ARG_TYPE (parm) = TREE_VALUE (typelist);
1514 /* All implementation args are read-only. */
1515 TREE_READONLY (parm) = 1;
1517 gfc_finish_decl (parm);
1519 f->sym->backend_decl = parm;
1521 arglist = chainon (arglist, parm);
1522 typelist = TREE_CHAIN (typelist);
1525 /* Add the hidden string length parameters. */
1526 arglist = chainon (arglist, hidden_arglist);
1528 gcc_assert (hidden_typelist == NULL_TREE
1529 || TREE_VALUE (hidden_typelist) == void_type_node);
1530 DECL_ARGUMENTS (fndecl) = arglist;
1533 /* Convert FNDECL's code to GIMPLE and handle any nested functions. */
1536 gfc_gimplify_function (tree fndecl)
1538 struct cgraph_node *cgn;
1540 gimplify_function_tree (fndecl);
1541 dump_function (TDI_generic, fndecl);
1543 /* Generate errors for structured block violations. */
1544 /* ??? Could be done as part of resolve_labels. */
1546 diagnose_omp_structured_block_errors (fndecl);
1548 /* Convert all nested functions to GIMPLE now. We do things in this order
1549 so that items like VLA sizes are expanded properly in the context of the
1550 correct function. */
1551 cgn = cgraph_node (fndecl);
1552 for (cgn = cgn->nested; cgn; cgn = cgn->next_nested)
1553 gfc_gimplify_function (cgn->decl);
1557 /* Do the setup necessary before generating the body of a function. */
1560 trans_function_start (gfc_symbol * sym)
1564 fndecl = sym->backend_decl;
1566 /* Let GCC know the current scope is this function. */
1567 current_function_decl = fndecl;
1569 /* Let the world know what we're about to do. */
1570 announce_function (fndecl);
1572 if (DECL_CONTEXT (fndecl) == NULL_TREE)
1574 /* Create RTL for function declaration. */
1575 rest_of_decl_compilation (fndecl, 1, 0);
1578 /* Create RTL for function definition. */
1579 make_decl_rtl (fndecl);
1581 init_function_start (fndecl);
1583 /* Even though we're inside a function body, we still don't want to
1584 call expand_expr to calculate the size of a variable-sized array.
1585 We haven't necessarily assigned RTL to all variables yet, so it's
1586 not safe to try to expand expressions involving them. */
1587 cfun->x_dont_save_pending_sizes_p = 1;
1589 /* function.c requires a push at the start of the function. */
1593 /* Create thunks for alternate entry points. */
1596 build_entry_thunks (gfc_namespace * ns)
1598 gfc_formal_arglist *formal;
1599 gfc_formal_arglist *thunk_formal;
1601 gfc_symbol *thunk_sym;
1609 /* This should always be a toplevel function. */
1610 gcc_assert (current_function_decl == NULL_TREE);
1612 gfc_get_backend_locus (&old_loc);
1613 for (el = ns->entries; el; el = el->next)
1615 thunk_sym = el->sym;
1617 build_function_decl (thunk_sym);
1618 create_function_arglist (thunk_sym);
1620 trans_function_start (thunk_sym);
1622 thunk_fndecl = thunk_sym->backend_decl;
1624 gfc_start_block (&body);
1626 /* Pass extra parameter identifying this entry point. */
1627 tmp = build_int_cst (gfc_array_index_type, el->id);
1628 args = tree_cons (NULL_TREE, tmp, NULL_TREE);
1629 string_args = NULL_TREE;
1631 if (thunk_sym->attr.function)
1633 if (gfc_return_by_reference (ns->proc_name))
1635 tree ref = DECL_ARGUMENTS (current_function_decl);
1636 args = tree_cons (NULL_TREE, ref, args);
1637 if (ns->proc_name->ts.type == BT_CHARACTER)
1638 args = tree_cons (NULL_TREE, TREE_CHAIN (ref),
1643 for (formal = ns->proc_name->formal; formal; formal = formal->next)
1645 /* Ignore alternate returns. */
1646 if (formal->sym == NULL)
1649 /* We don't have a clever way of identifying arguments, so resort to
1650 a brute-force search. */
1651 for (thunk_formal = thunk_sym->formal;
1653 thunk_formal = thunk_formal->next)
1655 if (thunk_formal->sym == formal->sym)
1661 /* Pass the argument. */
1662 DECL_ARTIFICIAL (thunk_formal->sym->backend_decl) = 1;
1663 args = tree_cons (NULL_TREE, thunk_formal->sym->backend_decl,
1665 if (formal->sym->ts.type == BT_CHARACTER)
1667 tmp = thunk_formal->sym->ts.cl->backend_decl;
1668 string_args = tree_cons (NULL_TREE, tmp, string_args);
1673 /* Pass NULL for a missing argument. */
1674 args = tree_cons (NULL_TREE, null_pointer_node, args);
1675 if (formal->sym->ts.type == BT_CHARACTER)
1677 tmp = build_int_cst (gfc_charlen_type_node, 0);
1678 string_args = tree_cons (NULL_TREE, tmp, string_args);
1683 /* Call the master function. */
1684 args = nreverse (args);
1685 args = chainon (args, nreverse (string_args));
1686 tmp = ns->proc_name->backend_decl;
1687 tmp = build_function_call_expr (tmp, args);
1688 if (ns->proc_name->attr.mixed_entry_master)
1690 tree union_decl, field;
1691 tree master_type = TREE_TYPE (ns->proc_name->backend_decl);
1693 union_decl = build_decl (VAR_DECL, get_identifier ("__result"),
1694 TREE_TYPE (master_type));
1695 DECL_ARTIFICIAL (union_decl) = 1;
1696 DECL_EXTERNAL (union_decl) = 0;
1697 TREE_PUBLIC (union_decl) = 0;
1698 TREE_USED (union_decl) = 1;
1699 layout_decl (union_decl, 0);
1700 pushdecl (union_decl);
1702 DECL_CONTEXT (union_decl) = current_function_decl;
1703 tmp = build2 (MODIFY_EXPR,
1704 TREE_TYPE (union_decl),
1706 gfc_add_expr_to_block (&body, tmp);
1708 for (field = TYPE_FIELDS (TREE_TYPE (union_decl));
1709 field; field = TREE_CHAIN (field))
1710 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (field)),
1711 thunk_sym->result->name) == 0)
1713 gcc_assert (field != NULL_TREE);
1714 tmp = build3 (COMPONENT_REF, TREE_TYPE (field), union_decl, field,
1716 tmp = build2 (MODIFY_EXPR,
1717 TREE_TYPE (DECL_RESULT (current_function_decl)),
1718 DECL_RESULT (current_function_decl), tmp);
1719 tmp = build1_v (RETURN_EXPR, tmp);
1721 else if (TREE_TYPE (DECL_RESULT (current_function_decl))
1724 tmp = build2 (MODIFY_EXPR,
1725 TREE_TYPE (DECL_RESULT (current_function_decl)),
1726 DECL_RESULT (current_function_decl), tmp);
1727 tmp = build1_v (RETURN_EXPR, tmp);
1729 gfc_add_expr_to_block (&body, tmp);
1731 /* Finish off this function and send it for code generation. */
1732 DECL_SAVED_TREE (thunk_fndecl) = gfc_finish_block (&body);
1734 BLOCK_SUPERCONTEXT (DECL_INITIAL (thunk_fndecl)) = thunk_fndecl;
1736 /* Output the GENERIC tree. */
1737 dump_function (TDI_original, thunk_fndecl);
1739 /* Store the end of the function, so that we get good line number
1740 info for the epilogue. */
1741 cfun->function_end_locus = input_location;
1743 /* We're leaving the context of this function, so zap cfun.
1744 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
1745 tree_rest_of_compilation. */
1748 current_function_decl = NULL_TREE;
1750 gfc_gimplify_function (thunk_fndecl);
1751 cgraph_finalize_function (thunk_fndecl, false);
1753 /* We share the symbols in the formal argument list with other entry
1754 points and the master function. Clear them so that they are
1755 recreated for each function. */
1756 for (formal = thunk_sym->formal; formal; formal = formal->next)
1757 if (formal->sym != NULL) /* Ignore alternate returns. */
1759 formal->sym->backend_decl = NULL_TREE;
1760 if (formal->sym->ts.type == BT_CHARACTER)
1761 formal->sym->ts.cl->backend_decl = NULL_TREE;
1764 if (thunk_sym->attr.function)
1766 if (thunk_sym->ts.type == BT_CHARACTER)
1767 thunk_sym->ts.cl->backend_decl = NULL_TREE;
1768 if (thunk_sym->result->ts.type == BT_CHARACTER)
1769 thunk_sym->result->ts.cl->backend_decl = NULL_TREE;
1773 gfc_set_backend_locus (&old_loc);
1777 /* Create a decl for a function, and create any thunks for alternate entry
1781 gfc_create_function_decl (gfc_namespace * ns)
1783 /* Create a declaration for the master function. */
1784 build_function_decl (ns->proc_name);
1786 /* Compile the entry thunks. */
1788 build_entry_thunks (ns);
1790 /* Now create the read argument list. */
1791 create_function_arglist (ns->proc_name);
1794 /* Return the decl used to hold the function return value. If
1795 parent_flag is set, the context is the parent_scope. */
1798 gfc_get_fake_result_decl (gfc_symbol * sym, int parent_flag)
1802 tree this_fake_result_decl;
1803 tree this_function_decl;
1805 char name[GFC_MAX_SYMBOL_LEN + 10];
1809 this_fake_result_decl = parent_fake_result_decl;
1810 this_function_decl = DECL_CONTEXT (current_function_decl);
1814 this_fake_result_decl = current_fake_result_decl;
1815 this_function_decl = current_function_decl;
1819 && sym->ns->proc_name->backend_decl == this_function_decl
1820 && sym->ns->proc_name->attr.entry_master
1821 && sym != sym->ns->proc_name)
1824 if (this_fake_result_decl != NULL)
1825 for (t = TREE_CHAIN (this_fake_result_decl); t; t = TREE_CHAIN (t))
1826 if (strcmp (IDENTIFIER_POINTER (TREE_PURPOSE (t)), sym->name) == 0)
1829 return TREE_VALUE (t);
1830 decl = gfc_get_fake_result_decl (sym->ns->proc_name, parent_flag);
1833 this_fake_result_decl = parent_fake_result_decl;
1835 this_fake_result_decl = current_fake_result_decl;
1837 if (decl && sym->ns->proc_name->attr.mixed_entry_master)
1841 for (field = TYPE_FIELDS (TREE_TYPE (decl));
1842 field; field = TREE_CHAIN (field))
1843 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (field)),
1847 gcc_assert (field != NULL_TREE);
1848 decl = build3 (COMPONENT_REF, TREE_TYPE (field), decl, field,
1852 var = create_tmp_var_raw (TREE_TYPE (decl), sym->name);
1854 gfc_add_decl_to_parent_function (var);
1856 gfc_add_decl_to_function (var);
1858 SET_DECL_VALUE_EXPR (var, decl);
1859 DECL_HAS_VALUE_EXPR_P (var) = 1;
1860 GFC_DECL_RESULT (var) = 1;
1862 TREE_CHAIN (this_fake_result_decl)
1863 = tree_cons (get_identifier (sym->name), var,
1864 TREE_CHAIN (this_fake_result_decl));
1868 if (this_fake_result_decl != NULL_TREE)
1869 return TREE_VALUE (this_fake_result_decl);
1871 /* Only when gfc_get_fake_result_decl is called by gfc_trans_return,
1876 if (sym->ts.type == BT_CHARACTER)
1878 if (sym->ts.cl->backend_decl == NULL_TREE)
1879 length = gfc_create_string_length (sym);
1881 length = sym->ts.cl->backend_decl;
1882 if (TREE_CODE (length) == VAR_DECL
1883 && DECL_CONTEXT (length) == NULL_TREE)
1884 gfc_add_decl_to_function (length);
1887 if (gfc_return_by_reference (sym))
1889 decl = DECL_ARGUMENTS (this_function_decl);
1891 if (sym->ns->proc_name->backend_decl == this_function_decl
1892 && sym->ns->proc_name->attr.entry_master)
1893 decl = TREE_CHAIN (decl);
1895 TREE_USED (decl) = 1;
1897 decl = gfc_build_dummy_array_decl (sym, decl);
1901 sprintf (name, "__result_%.20s",
1902 IDENTIFIER_POINTER (DECL_NAME (this_function_decl)));
1904 if (!sym->attr.mixed_entry_master && sym->attr.function)
1905 decl = build_decl (VAR_DECL, get_identifier (name),
1906 gfc_sym_type (sym));
1908 decl = build_decl (VAR_DECL, get_identifier (name),
1909 TREE_TYPE (TREE_TYPE (this_function_decl)));
1910 DECL_ARTIFICIAL (decl) = 1;
1911 DECL_EXTERNAL (decl) = 0;
1912 TREE_PUBLIC (decl) = 0;
1913 TREE_USED (decl) = 1;
1914 GFC_DECL_RESULT (decl) = 1;
1915 TREE_ADDRESSABLE (decl) = 1;
1917 layout_decl (decl, 0);
1920 gfc_add_decl_to_parent_function (decl);
1922 gfc_add_decl_to_function (decl);
1926 parent_fake_result_decl = build_tree_list (NULL, decl);
1928 current_fake_result_decl = build_tree_list (NULL, decl);
1934 /* Builds a function decl. The remaining parameters are the types of the
1935 function arguments. Negative nargs indicates a varargs function. */
1938 gfc_build_library_function_decl (tree name, tree rettype, int nargs, ...)
1947 /* Library functions must be declared with global scope. */
1948 gcc_assert (current_function_decl == NULL_TREE);
1950 va_start (p, nargs);
1953 /* Create a list of the argument types. */
1954 for (arglist = NULL_TREE, n = abs (nargs); n > 0; n--)
1956 argtype = va_arg (p, tree);
1957 arglist = gfc_chainon_list (arglist, argtype);
1962 /* Terminate the list. */
1963 arglist = gfc_chainon_list (arglist, void_type_node);
1966 /* Build the function type and decl. */
1967 fntype = build_function_type (rettype, arglist);
1968 fndecl = build_decl (FUNCTION_DECL, name, fntype);
1970 /* Mark this decl as external. */
1971 DECL_EXTERNAL (fndecl) = 1;
1972 TREE_PUBLIC (fndecl) = 1;
1978 rest_of_decl_compilation (fndecl, 1, 0);
1984 gfc_build_intrinsic_function_decls (void)
1986 tree gfc_int4_type_node = gfc_get_int_type (4);
1987 tree gfc_int8_type_node = gfc_get_int_type (8);
1988 tree gfc_int16_type_node = gfc_get_int_type (16);
1989 tree gfc_logical4_type_node = gfc_get_logical_type (4);
1990 tree gfc_real4_type_node = gfc_get_real_type (4);
1991 tree gfc_real8_type_node = gfc_get_real_type (8);
1992 tree gfc_real10_type_node = gfc_get_real_type (10);
1993 tree gfc_real16_type_node = gfc_get_real_type (16);
1994 tree gfc_complex4_type_node = gfc_get_complex_type (4);
1995 tree gfc_complex8_type_node = gfc_get_complex_type (8);
1996 tree gfc_complex10_type_node = gfc_get_complex_type (10);
1997 tree gfc_complex16_type_node = gfc_get_complex_type (16);
1999 /* String functions. */
2000 gfor_fndecl_compare_string =
2001 gfc_build_library_function_decl (get_identifier (PREFIX("compare_string")),
2004 gfc_charlen_type_node, pchar_type_node,
2005 gfc_charlen_type_node, pchar_type_node);
2007 gfor_fndecl_concat_string =
2008 gfc_build_library_function_decl (get_identifier (PREFIX("concat_string")),
2011 gfc_charlen_type_node, pchar_type_node,
2012 gfc_charlen_type_node, pchar_type_node,
2013 gfc_charlen_type_node, pchar_type_node);
2015 gfor_fndecl_string_len_trim =
2016 gfc_build_library_function_decl (get_identifier (PREFIX("string_len_trim")),
2018 2, gfc_charlen_type_node,
2021 gfor_fndecl_string_index =
2022 gfc_build_library_function_decl (get_identifier (PREFIX("string_index")),
2024 5, gfc_charlen_type_node, pchar_type_node,
2025 gfc_charlen_type_node, pchar_type_node,
2026 gfc_logical4_type_node);
2028 gfor_fndecl_string_scan =
2029 gfc_build_library_function_decl (get_identifier (PREFIX("string_scan")),
2031 5, gfc_charlen_type_node, pchar_type_node,
2032 gfc_charlen_type_node, pchar_type_node,
2033 gfc_logical4_type_node);
2035 gfor_fndecl_string_verify =
2036 gfc_build_library_function_decl (get_identifier (PREFIX("string_verify")),
2038 5, gfc_charlen_type_node, pchar_type_node,
2039 gfc_charlen_type_node, pchar_type_node,
2040 gfc_logical4_type_node);
2042 gfor_fndecl_string_trim =
2043 gfc_build_library_function_decl (get_identifier (PREFIX("string_trim")),
2046 build_pointer_type (gfc_charlen_type_node),
2048 gfc_charlen_type_node,
2051 gfor_fndecl_string_minmax =
2052 gfc_build_library_function_decl (get_identifier (PREFIX("string_minmax")),
2054 build_pointer_type (gfc_charlen_type_node),
2055 ppvoid_type_node, integer_type_node,
2058 gfor_fndecl_ttynam =
2059 gfc_build_library_function_decl (get_identifier (PREFIX("ttynam")),
2063 gfc_charlen_type_node,
2067 gfc_build_library_function_decl (get_identifier (PREFIX("fdate")),
2071 gfc_charlen_type_node);
2074 gfc_build_library_function_decl (get_identifier (PREFIX("ctime")),
2078 gfc_charlen_type_node,
2079 gfc_int8_type_node);
2081 gfor_fndecl_adjustl =
2082 gfc_build_library_function_decl (get_identifier (PREFIX("adjustl")),
2086 gfc_charlen_type_node, pchar_type_node);
2088 gfor_fndecl_adjustr =
2089 gfc_build_library_function_decl (get_identifier (PREFIX("adjustr")),
2093 gfc_charlen_type_node, pchar_type_node);
2095 gfor_fndecl_si_kind =
2096 gfc_build_library_function_decl (get_identifier
2097 (PREFIX("selected_int_kind")),
2102 gfor_fndecl_sr_kind =
2103 gfc_build_library_function_decl (get_identifier
2104 (PREFIX("selected_real_kind")),
2109 /* Power functions. */
2111 tree ctype, rtype, itype, jtype;
2112 int rkind, ikind, jkind;
2115 static int ikinds[NIKINDS] = {4, 8, 16};
2116 static int rkinds[NRKINDS] = {4, 8, 10, 16};
2117 char name[PREFIX_LEN + 12]; /* _gfortran_pow_?n_?n */
2119 for (ikind=0; ikind < NIKINDS; ikind++)
2121 itype = gfc_get_int_type (ikinds[ikind]);
2123 for (jkind=0; jkind < NIKINDS; jkind++)
2125 jtype = gfc_get_int_type (ikinds[jkind]);
2128 sprintf(name, PREFIX("pow_i%d_i%d"), ikinds[ikind],
2130 gfor_fndecl_math_powi[jkind][ikind].integer =
2131 gfc_build_library_function_decl (get_identifier (name),
2132 jtype, 2, jtype, itype);
2133 TREE_READONLY (gfor_fndecl_math_powi[jkind][ikind].integer) = 1;
2137 for (rkind = 0; rkind < NRKINDS; rkind ++)
2139 rtype = gfc_get_real_type (rkinds[rkind]);
2142 sprintf(name, PREFIX("pow_r%d_i%d"), rkinds[rkind],
2144 gfor_fndecl_math_powi[rkind][ikind].real =
2145 gfc_build_library_function_decl (get_identifier (name),
2146 rtype, 2, rtype, itype);
2147 TREE_READONLY (gfor_fndecl_math_powi[rkind][ikind].real) = 1;
2150 ctype = gfc_get_complex_type (rkinds[rkind]);
2153 sprintf(name, PREFIX("pow_c%d_i%d"), rkinds[rkind],
2155 gfor_fndecl_math_powi[rkind][ikind].cmplx =
2156 gfc_build_library_function_decl (get_identifier (name),
2157 ctype, 2,ctype, itype);
2158 TREE_READONLY (gfor_fndecl_math_powi[rkind][ikind].cmplx) = 1;
2166 gfor_fndecl_math_cpowf =
2167 gfc_build_library_function_decl (get_identifier ("cpowf"),
2168 gfc_complex4_type_node,
2169 1, gfc_complex4_type_node);
2170 gfor_fndecl_math_cpow =
2171 gfc_build_library_function_decl (get_identifier ("cpow"),
2172 gfc_complex8_type_node,
2173 1, gfc_complex8_type_node);
2174 if (gfc_complex10_type_node)
2175 gfor_fndecl_math_cpowl10 =
2176 gfc_build_library_function_decl (get_identifier ("cpowl"),
2177 gfc_complex10_type_node, 1,
2178 gfc_complex10_type_node);
2179 if (gfc_complex16_type_node)
2180 gfor_fndecl_math_cpowl16 =
2181 gfc_build_library_function_decl (get_identifier ("cpowl"),
2182 gfc_complex16_type_node, 1,
2183 gfc_complex16_type_node);
2185 gfor_fndecl_math_ishftc4 =
2186 gfc_build_library_function_decl (get_identifier (PREFIX("ishftc4")),
2188 3, gfc_int4_type_node,
2189 gfc_int4_type_node, gfc_int4_type_node);
2190 gfor_fndecl_math_ishftc8 =
2191 gfc_build_library_function_decl (get_identifier (PREFIX("ishftc8")),
2193 3, gfc_int8_type_node,
2194 gfc_int4_type_node, gfc_int4_type_node);
2195 if (gfc_int16_type_node)
2196 gfor_fndecl_math_ishftc16 =
2197 gfc_build_library_function_decl (get_identifier (PREFIX("ishftc16")),
2198 gfc_int16_type_node, 3,
2199 gfc_int16_type_node,
2201 gfc_int4_type_node);
2203 gfor_fndecl_math_exponent4 =
2204 gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r4")),
2206 1, gfc_real4_type_node);
2207 gfor_fndecl_math_exponent8 =
2208 gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r8")),
2210 1, gfc_real8_type_node);
2211 if (gfc_real10_type_node)
2212 gfor_fndecl_math_exponent10 =
2213 gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r10")),
2214 gfc_int4_type_node, 1,
2215 gfc_real10_type_node);
2216 if (gfc_real16_type_node)
2217 gfor_fndecl_math_exponent16 =
2218 gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r16")),
2219 gfc_int4_type_node, 1,
2220 gfc_real16_type_node);
2222 /* BLAS functions. */
2224 tree pint = build_pointer_type (integer_type_node);
2225 tree ps = build_pointer_type (gfc_get_real_type (gfc_default_real_kind));
2226 tree pd = build_pointer_type (gfc_get_real_type (gfc_default_double_kind));
2227 tree pc = build_pointer_type (gfc_get_complex_type (gfc_default_real_kind));
2228 tree pz = build_pointer_type
2229 (gfc_get_complex_type (gfc_default_double_kind));
2231 gfor_fndecl_sgemm = gfc_build_library_function_decl
2233 (gfc_option.flag_underscoring ? "sgemm_"
2235 void_type_node, 15, pchar_type_node,
2236 pchar_type_node, pint, pint, pint, ps, ps, pint,
2237 ps, pint, ps, ps, pint, integer_type_node,
2239 gfor_fndecl_dgemm = gfc_build_library_function_decl
2241 (gfc_option.flag_underscoring ? "dgemm_"
2243 void_type_node, 15, pchar_type_node,
2244 pchar_type_node, pint, pint, pint, pd, pd, pint,
2245 pd, pint, pd, pd, pint, integer_type_node,
2247 gfor_fndecl_cgemm = gfc_build_library_function_decl
2249 (gfc_option.flag_underscoring ? "cgemm_"
2251 void_type_node, 15, pchar_type_node,
2252 pchar_type_node, pint, pint, pint, pc, pc, pint,
2253 pc, pint, pc, pc, pint, integer_type_node,
2255 gfor_fndecl_zgemm = gfc_build_library_function_decl
2257 (gfc_option.flag_underscoring ? "zgemm_"
2259 void_type_node, 15, pchar_type_node,
2260 pchar_type_node, pint, pint, pint, pz, pz, pint,
2261 pz, pint, pz, pz, pint, integer_type_node,
2265 /* Other functions. */
2267 gfc_build_library_function_decl (get_identifier (PREFIX("size0")),
2268 gfc_array_index_type,
2269 1, pvoid_type_node);
2271 gfc_build_library_function_decl (get_identifier (PREFIX("size1")),
2272 gfc_array_index_type,
2274 gfc_array_index_type);
2277 gfc_build_library_function_decl (get_identifier (PREFIX ("iargc")),
2283 /* Make prototypes for runtime library functions. */
2286 gfc_build_builtin_function_decls (void)
2288 tree gfc_int4_type_node = gfc_get_int_type (4);
2289 tree gfc_logical4_type_node = gfc_get_logical_type (4);
2290 tree gfc_pint4_type_node = build_pointer_type (gfc_int4_type_node);
2292 gfor_fndecl_internal_realloc =
2293 gfc_build_library_function_decl (get_identifier
2294 (PREFIX("internal_realloc")),
2295 pvoid_type_node, 2, pvoid_type_node,
2296 gfc_array_index_type);
2298 gfor_fndecl_allocate =
2299 gfc_build_library_function_decl (get_identifier (PREFIX("allocate")),
2301 gfc_array_index_type, gfc_pint4_type_node);
2302 DECL_IS_MALLOC (gfor_fndecl_allocate) = 1;
2304 gfor_fndecl_allocate_array =
2305 gfc_build_library_function_decl (get_identifier (PREFIX("allocate_array")),
2306 pvoid_type_node, 3, pvoid_type_node,
2307 gfc_array_index_type, gfc_pint4_type_node);
2308 DECL_IS_MALLOC (gfor_fndecl_allocate_array) = 1;
2310 gfor_fndecl_deallocate =
2311 gfc_build_library_function_decl (get_identifier (PREFIX("deallocate")),
2312 void_type_node, 2, pvoid_type_node,
2313 gfc_pint4_type_node);
2315 gfor_fndecl_stop_numeric =
2316 gfc_build_library_function_decl (get_identifier (PREFIX("stop_numeric")),
2317 void_type_node, 1, gfc_int4_type_node);
2319 /* Stop doesn't return. */
2320 TREE_THIS_VOLATILE (gfor_fndecl_stop_numeric) = 1;
2322 gfor_fndecl_stop_string =
2323 gfc_build_library_function_decl (get_identifier (PREFIX("stop_string")),
2324 void_type_node, 2, pchar_type_node,
2325 gfc_int4_type_node);
2326 /* Stop doesn't return. */
2327 TREE_THIS_VOLATILE (gfor_fndecl_stop_string) = 1;
2329 gfor_fndecl_pause_numeric =
2330 gfc_build_library_function_decl (get_identifier (PREFIX("pause_numeric")),
2331 void_type_node, 1, gfc_int4_type_node);
2333 gfor_fndecl_pause_string =
2334 gfc_build_library_function_decl (get_identifier (PREFIX("pause_string")),
2335 void_type_node, 2, pchar_type_node,
2336 gfc_int4_type_node);
2338 gfor_fndecl_select_string =
2339 gfc_build_library_function_decl (get_identifier (PREFIX("select_string")),
2340 integer_type_node, 0);
2342 gfor_fndecl_runtime_error =
2343 gfc_build_library_function_decl (get_identifier (PREFIX("runtime_error")),
2344 void_type_node, 1, pchar_type_node);
2345 /* The runtime_error function does not return. */
2346 TREE_THIS_VOLATILE (gfor_fndecl_runtime_error) = 1;
2348 gfor_fndecl_runtime_error_at =
2349 gfc_build_library_function_decl (get_identifier (PREFIX("runtime_error_at")),
2350 void_type_node, 2, pchar_type_node,
2352 /* The runtime_error_at function does not return. */
2353 TREE_THIS_VOLATILE (gfor_fndecl_runtime_error_at) = 1;
2355 gfor_fndecl_generate_error =
2356 gfc_build_library_function_decl (get_identifier (PREFIX("generate_error")),
2357 void_type_node, 3, pvoid_type_node,
2358 integer_type_node, pchar_type_node);
2360 gfor_fndecl_os_error =
2361 gfc_build_library_function_decl (get_identifier (PREFIX("os_error")),
2362 void_type_node, 1, pchar_type_node);
2363 /* The runtime_error function does not return. */
2364 TREE_THIS_VOLATILE (gfor_fndecl_os_error) = 1;
2366 gfor_fndecl_set_fpe =
2367 gfc_build_library_function_decl (get_identifier (PREFIX("set_fpe")),
2368 void_type_node, 1, integer_type_node);
2370 /* Keep the array dimension in sync with the call, later in this file. */
2371 gfor_fndecl_set_options =
2372 gfc_build_library_function_decl (get_identifier (PREFIX("set_options")),
2373 void_type_node, 2, integer_type_node,
2376 gfor_fndecl_set_convert =
2377 gfc_build_library_function_decl (get_identifier (PREFIX("set_convert")),
2378 void_type_node, 1, integer_type_node);
2380 gfor_fndecl_set_record_marker =
2381 gfc_build_library_function_decl (get_identifier (PREFIX("set_record_marker")),
2382 void_type_node, 1, integer_type_node);
2384 gfor_fndecl_set_max_subrecord_length =
2385 gfc_build_library_function_decl (get_identifier (PREFIX("set_max_subrecord_length")),
2386 void_type_node, 1, integer_type_node);
2388 gfor_fndecl_in_pack = gfc_build_library_function_decl (
2389 get_identifier (PREFIX("internal_pack")),
2390 pvoid_type_node, 1, pvoid_type_node);
2392 gfor_fndecl_in_unpack = gfc_build_library_function_decl (
2393 get_identifier (PREFIX("internal_unpack")),
2394 pvoid_type_node, 1, pvoid_type_node);
2396 gfor_fndecl_associated =
2397 gfc_build_library_function_decl (
2398 get_identifier (PREFIX("associated")),
2399 gfc_logical4_type_node,
2404 gfc_build_intrinsic_function_decls ();
2405 gfc_build_intrinsic_lib_fndecls ();
2406 gfc_build_io_library_fndecls ();
2410 /* Evaluate the length of dummy character variables. */
2413 gfc_trans_dummy_character (gfc_symbol *sym, gfc_charlen *cl, tree fnbody)
2417 gfc_finish_decl (cl->backend_decl);
2419 gfc_start_block (&body);
2421 /* Evaluate the string length expression. */
2422 gfc_trans_init_string_length (cl, &body);
2424 gfc_trans_vla_type_sizes (sym, &body);
2426 gfc_add_expr_to_block (&body, fnbody);
2427 return gfc_finish_block (&body);
2431 /* Allocate and cleanup an automatic character variable. */
2434 gfc_trans_auto_character_variable (gfc_symbol * sym, tree fnbody)
2440 gcc_assert (sym->backend_decl);
2441 gcc_assert (sym->ts.cl && sym->ts.cl->length);
2443 gfc_start_block (&body);
2445 /* Evaluate the string length expression. */
2446 gfc_trans_init_string_length (sym->ts.cl, &body);
2448 gfc_trans_vla_type_sizes (sym, &body);
2450 decl = sym->backend_decl;
2452 /* Emit a DECL_EXPR for this variable, which will cause the
2453 gimplifier to allocate storage, and all that good stuff. */
2454 tmp = build1 (DECL_EXPR, TREE_TYPE (decl), decl);
2455 gfc_add_expr_to_block (&body, tmp);
2457 gfc_add_expr_to_block (&body, fnbody);
2458 return gfc_finish_block (&body);
2461 /* Set the initial value of ASSIGN statement auxiliary variable explicitly. */
2464 gfc_trans_assign_aux_var (gfc_symbol * sym, tree fnbody)
2468 gcc_assert (sym->backend_decl);
2469 gfc_start_block (&body);
2471 /* Set the initial value to length. See the comments in
2472 function gfc_add_assign_aux_vars in this file. */
2473 gfc_add_modify_expr (&body, GFC_DECL_STRING_LEN (sym->backend_decl),
2474 build_int_cst (NULL_TREE, -2));
2476 gfc_add_expr_to_block (&body, fnbody);
2477 return gfc_finish_block (&body);
2481 gfc_trans_vla_one_sizepos (tree *tp, stmtblock_t *body)
2483 tree t = *tp, var, val;
2485 if (t == NULL || t == error_mark_node)
2487 if (TREE_CONSTANT (t) || DECL_P (t))
2490 if (TREE_CODE (t) == SAVE_EXPR)
2492 if (SAVE_EXPR_RESOLVED_P (t))
2494 *tp = TREE_OPERAND (t, 0);
2497 val = TREE_OPERAND (t, 0);
2502 var = gfc_create_var_np (TREE_TYPE (t), NULL);
2503 gfc_add_decl_to_function (var);
2504 gfc_add_modify_expr (body, var, val);
2505 if (TREE_CODE (t) == SAVE_EXPR)
2506 TREE_OPERAND (t, 0) = var;
2511 gfc_trans_vla_type_sizes_1 (tree type, stmtblock_t *body)
2515 if (type == NULL || type == error_mark_node)
2518 type = TYPE_MAIN_VARIANT (type);
2520 if (TREE_CODE (type) == INTEGER_TYPE)
2522 gfc_trans_vla_one_sizepos (&TYPE_MIN_VALUE (type), body);
2523 gfc_trans_vla_one_sizepos (&TYPE_MAX_VALUE (type), body);
2525 for (t = TYPE_NEXT_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
2527 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (type);
2528 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (type);
2531 else if (TREE_CODE (type) == ARRAY_TYPE)
2533 gfc_trans_vla_type_sizes_1 (TREE_TYPE (type), body);
2534 gfc_trans_vla_type_sizes_1 (TYPE_DOMAIN (type), body);
2535 gfc_trans_vla_one_sizepos (&TYPE_SIZE (type), body);
2536 gfc_trans_vla_one_sizepos (&TYPE_SIZE_UNIT (type), body);
2538 for (t = TYPE_NEXT_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
2540 TYPE_SIZE (t) = TYPE_SIZE (type);
2541 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (type);
2546 /* Make sure all type sizes and array domains are either constant,
2547 or variable or parameter decls. This is a simplified variant
2548 of gimplify_type_sizes, but we can't use it here, as none of the
2549 variables in the expressions have been gimplified yet.
2550 As type sizes and domains for various variable length arrays
2551 contain VAR_DECLs that are only initialized at gfc_trans_deferred_vars
2552 time, without this routine gimplify_type_sizes in the middle-end
2553 could result in the type sizes being gimplified earlier than where
2554 those variables are initialized. */
2557 gfc_trans_vla_type_sizes (gfc_symbol *sym, stmtblock_t *body)
2559 tree type = TREE_TYPE (sym->backend_decl);
2561 if (TREE_CODE (type) == FUNCTION_TYPE
2562 && (sym->attr.function || sym->attr.result || sym->attr.entry))
2564 if (! current_fake_result_decl)
2567 type = TREE_TYPE (TREE_VALUE (current_fake_result_decl));
2570 while (POINTER_TYPE_P (type))
2571 type = TREE_TYPE (type);
2573 if (GFC_DESCRIPTOR_TYPE_P (type))
2575 tree etype = GFC_TYPE_ARRAY_DATAPTR_TYPE (type);
2577 while (POINTER_TYPE_P (etype))
2578 etype = TREE_TYPE (etype);
2580 gfc_trans_vla_type_sizes_1 (etype, body);
2583 gfc_trans_vla_type_sizes_1 (type, body);
2587 /* Generate function entry and exit code, and add it to the function body.
2589 Allocation and initialization of array variables.
2590 Allocation of character string variables.
2591 Initialization and possibly repacking of dummy arrays.
2592 Initialization of ASSIGN statement auxiliary variable. */
2595 gfc_trans_deferred_vars (gfc_symbol * proc_sym, tree fnbody)
2599 gfc_formal_arglist *f;
2601 bool seen_trans_deferred_array = false;
2603 /* Deal with implicit return variables. Explicit return variables will
2604 already have been added. */
2605 if (gfc_return_by_reference (proc_sym) && proc_sym->result == proc_sym)
2607 if (!current_fake_result_decl)
2609 gfc_entry_list *el = NULL;
2610 if (proc_sym->attr.entry_master)
2612 for (el = proc_sym->ns->entries; el; el = el->next)
2613 if (el->sym != el->sym->result)
2617 warning (0, "Function does not return a value");
2619 else if (proc_sym->as)
2621 tree result = TREE_VALUE (current_fake_result_decl);
2622 fnbody = gfc_trans_dummy_array_bias (proc_sym, result, fnbody);
2624 /* An automatic character length, pointer array result. */
2625 if (proc_sym->ts.type == BT_CHARACTER
2626 && TREE_CODE (proc_sym->ts.cl->backend_decl) == VAR_DECL)
2627 fnbody = gfc_trans_dummy_character (proc_sym, proc_sym->ts.cl,
2630 else if (proc_sym->ts.type == BT_CHARACTER)
2632 if (TREE_CODE (proc_sym->ts.cl->backend_decl) == VAR_DECL)
2633 fnbody = gfc_trans_dummy_character (proc_sym, proc_sym->ts.cl,
2637 gcc_assert (gfc_option.flag_f2c
2638 && proc_sym->ts.type == BT_COMPLEX);
2641 for (sym = proc_sym->tlink; sym != proc_sym; sym = sym->tlink)
2643 bool sym_has_alloc_comp = (sym->ts.type == BT_DERIVED)
2644 && sym->ts.derived->attr.alloc_comp;
2645 if (sym->attr.dimension)
2647 switch (sym->as->type)
2650 if (sym->attr.dummy || sym->attr.result)
2652 gfc_trans_dummy_array_bias (sym, sym->backend_decl, fnbody);
2653 else if (sym->attr.pointer || sym->attr.allocatable)
2655 if (TREE_STATIC (sym->backend_decl))
2656 gfc_trans_static_array_pointer (sym);
2659 seen_trans_deferred_array = true;
2660 fnbody = gfc_trans_deferred_array (sym, fnbody);
2665 if (sym_has_alloc_comp)
2667 seen_trans_deferred_array = true;
2668 fnbody = gfc_trans_deferred_array (sym, fnbody);
2671 gfc_get_backend_locus (&loc);
2672 gfc_set_backend_locus (&sym->declared_at);
2673 fnbody = gfc_trans_auto_array_allocation (sym->backend_decl,
2675 gfc_set_backend_locus (&loc);
2679 case AS_ASSUMED_SIZE:
2680 /* Must be a dummy parameter. */
2681 gcc_assert (sym->attr.dummy);
2683 /* We should always pass assumed size arrays the g77 way. */
2684 fnbody = gfc_trans_g77_array (sym, fnbody);
2687 case AS_ASSUMED_SHAPE:
2688 /* Must be a dummy parameter. */
2689 gcc_assert (sym->attr.dummy);
2691 fnbody = gfc_trans_dummy_array_bias (sym, sym->backend_decl,
2696 seen_trans_deferred_array = true;
2697 fnbody = gfc_trans_deferred_array (sym, fnbody);
2703 if (sym_has_alloc_comp && !seen_trans_deferred_array)
2704 fnbody = gfc_trans_deferred_array (sym, fnbody);
2706 else if (sym_has_alloc_comp)
2707 fnbody = gfc_trans_deferred_array (sym, fnbody);
2708 else if (sym->ts.type == BT_CHARACTER)
2710 gfc_get_backend_locus (&loc);
2711 gfc_set_backend_locus (&sym->declared_at);
2712 if (sym->attr.dummy || sym->attr.result)
2713 fnbody = gfc_trans_dummy_character (sym, sym->ts.cl, fnbody);
2715 fnbody = gfc_trans_auto_character_variable (sym, fnbody);
2716 gfc_set_backend_locus (&loc);
2718 else if (sym->attr.assign)
2720 gfc_get_backend_locus (&loc);
2721 gfc_set_backend_locus (&sym->declared_at);
2722 fnbody = gfc_trans_assign_aux_var (sym, fnbody);
2723 gfc_set_backend_locus (&loc);
2729 gfc_init_block (&body);
2731 for (f = proc_sym->formal; f; f = f->next)
2733 if (f->sym && f->sym->tlink == NULL && f->sym->ts.type == BT_CHARACTER)
2735 gcc_assert (f->sym->ts.cl->backend_decl != NULL);
2736 if (TREE_CODE (f->sym->ts.cl->backend_decl) == PARM_DECL)
2737 gfc_trans_vla_type_sizes (f->sym, &body);
2740 /* If an INTENT(OUT) dummy of derived type has a default
2741 initializer, it must be initialized here. */
2742 if (f->sym && f->sym->attr.intent == INTENT_OUT
2743 && f->sym->ts.type == BT_DERIVED
2744 && !f->sym->ts.derived->attr.alloc_comp
2749 gcc_assert (!f->sym->attr.allocatable);
2750 gfc_set_sym_referenced (f->sym);
2751 tmpe = gfc_lval_expr_from_sym (f->sym);
2752 tmp = gfc_trans_assignment (tmpe, f->sym->value, false);
2754 present = gfc_conv_expr_present (f->sym);
2755 tmp = build3 (COND_EXPR, TREE_TYPE (tmp), present,
2756 tmp, build_empty_stmt ());
2757 gfc_add_expr_to_block (&body, tmp);
2758 gfc_free_expr (tmpe);
2762 if (gfc_return_by_reference (proc_sym) && proc_sym->ts.type == BT_CHARACTER
2763 && current_fake_result_decl != NULL)
2765 gcc_assert (proc_sym->ts.cl->backend_decl != NULL);
2766 if (TREE_CODE (proc_sym->ts.cl->backend_decl) == PARM_DECL)
2767 gfc_trans_vla_type_sizes (proc_sym, &body);
2770 gfc_add_expr_to_block (&body, fnbody);
2771 return gfc_finish_block (&body);
2775 /* Output an initialized decl for a module variable. */
2778 gfc_create_module_variable (gfc_symbol * sym)
2782 /* Module functions with alternate entries are dealt with later and
2783 would get caught by the next condition. */
2784 if (sym->attr.entry)
2787 /* Make sure we convert the types of the derived types from iso_c_binding
2789 if (sym->attr.flavor != FL_PROCEDURE && sym->attr.is_iso_c
2790 && sym->ts.type == BT_DERIVED)
2791 sym->backend_decl = gfc_typenode_for_spec (&(sym->ts));
2793 /* Only output variables and array valued parameters. */
2794 if (sym->attr.flavor != FL_VARIABLE
2795 && (sym->attr.flavor != FL_PARAMETER || sym->attr.dimension == 0))
2798 /* Don't generate variables from other modules. Variables from
2799 COMMONs will already have been generated. */
2800 if (sym->attr.use_assoc || sym->attr.in_common)
2803 /* Equivalenced variables arrive here after creation. */
2804 if (sym->backend_decl
2805 && (sym->equiv_built || sym->attr.in_equivalence))
2808 if (sym->backend_decl)
2809 internal_error ("backend decl for module variable %s already exists",
2812 /* We always want module variables to be created. */
2813 sym->attr.referenced = 1;
2814 /* Create the decl. */
2815 decl = gfc_get_symbol_decl (sym);
2817 /* Create the variable. */
2819 rest_of_decl_compilation (decl, 1, 0);
2821 /* Also add length of strings. */
2822 if (sym->ts.type == BT_CHARACTER)
2826 length = sym->ts.cl->backend_decl;
2827 if (!INTEGER_CST_P (length))
2830 rest_of_decl_compilation (length, 1, 0);
2836 /* Generate all the required code for module variables. */
2839 gfc_generate_module_vars (gfc_namespace * ns)
2841 module_namespace = ns;
2843 /* Check if the frontend left the namespace in a reasonable state. */
2844 gcc_assert (ns->proc_name && !ns->proc_name->tlink);
2846 /* Generate COMMON blocks. */
2847 gfc_trans_common (ns);
2849 /* Create decls for all the module variables. */
2850 gfc_traverse_ns (ns, gfc_create_module_variable);
2854 gfc_generate_contained_functions (gfc_namespace * parent)
2858 /* We create all the prototypes before generating any code. */
2859 for (ns = parent->contained; ns; ns = ns->sibling)
2861 /* Skip namespaces from used modules. */
2862 if (ns->parent != parent)
2865 gfc_create_function_decl (ns);
2868 for (ns = parent->contained; ns; ns = ns->sibling)
2870 /* Skip namespaces from used modules. */
2871 if (ns->parent != parent)
2874 gfc_generate_function_code (ns);
2879 /* Drill down through expressions for the array specification bounds and
2880 character length calling generate_local_decl for all those variables
2881 that have not already been declared. */
2884 generate_local_decl (gfc_symbol *);
2887 generate_expr_decls (gfc_symbol *sym, gfc_expr *e)
2889 gfc_actual_arglist *arg;
2896 switch (e->expr_type)
2899 for (arg = e->value.function.actual; arg; arg = arg->next)
2900 generate_expr_decls (sym, arg->expr);
2903 /* If the variable is not the same as the dependent, 'sym', and
2904 it is not marked as being declared and it is in the same
2905 namespace as 'sym', add it to the local declarations. */
2907 if (sym == e->symtree->n.sym
2908 || e->symtree->n.sym->mark
2909 || e->symtree->n.sym->ns != sym->ns)
2912 generate_local_decl (e->symtree->n.sym);
2916 generate_expr_decls (sym, e->value.op.op1);
2917 generate_expr_decls (sym, e->value.op.op2);
2926 for (ref = e->ref; ref; ref = ref->next)
2931 for (i = 0; i < ref->u.ar.dimen; i++)
2933 generate_expr_decls (sym, ref->u.ar.start[i]);
2934 generate_expr_decls (sym, ref->u.ar.end[i]);
2935 generate_expr_decls (sym, ref->u.ar.stride[i]);
2940 generate_expr_decls (sym, ref->u.ss.start);
2941 generate_expr_decls (sym, ref->u.ss.end);
2945 if (ref->u.c.component->ts.type == BT_CHARACTER
2946 && ref->u.c.component->ts.cl->length->expr_type
2948 generate_expr_decls (sym, ref->u.c.component->ts.cl->length);
2950 if (ref->u.c.component->as)
2951 for (i = 0; i < ref->u.c.component->as->rank; i++)
2953 generate_expr_decls (sym, ref->u.c.component->as->lower[i]);
2954 generate_expr_decls (sym, ref->u.c.component->as->upper[i]);
2963 /* Check for dependencies in the character length and array spec. */
2966 generate_dependency_declarations (gfc_symbol *sym)
2970 if (sym->ts.type == BT_CHARACTER
2971 && sym->ts.cl->length->expr_type != EXPR_CONSTANT)
2972 generate_expr_decls (sym, sym->ts.cl->length);
2974 if (sym->as && sym->as->rank)
2976 for (i = 0; i < sym->as->rank; i++)
2978 generate_expr_decls (sym, sym->as->lower[i]);
2979 generate_expr_decls (sym, sym->as->upper[i]);
2985 /* Generate decls for all local variables. We do this to ensure correct
2986 handling of expressions which only appear in the specification of
2990 generate_local_decl (gfc_symbol * sym)
2992 if (sym->attr.flavor == FL_VARIABLE)
2994 /* Check for dependencies in the array specification and string
2995 length, adding the necessary declarations to the function. We
2996 mark the symbol now, as well as in traverse_ns, to prevent
2997 getting stuck in a circular dependency. */
2999 if (!sym->attr.dummy && !sym->ns->proc_name->attr.entry_master)
3000 generate_dependency_declarations (sym);
3002 if (sym->attr.referenced)
3003 gfc_get_symbol_decl (sym);
3004 /* INTENT(out) dummy arguments are likely meant to be set. */
3005 else if (warn_unused_variable
3007 && sym->attr.intent == INTENT_OUT)
3008 gfc_warning ("Dummy argument '%s' at %L was declared INTENT(OUT) but was not set",
3009 sym->name, &sym->declared_at);
3010 /* Specific warning for unused dummy arguments. */
3011 else if (warn_unused_variable && sym->attr.dummy)
3012 gfc_warning ("Unused dummy argument '%s' at %L", sym->name,
3014 /* Warn for unused variables, but not if they're inside a common
3015 block or are use-associated. */
3016 else if (warn_unused_variable
3017 && !(sym->attr.in_common || sym->attr.use_assoc))
3018 gfc_warning ("Unused variable '%s' declared at %L", sym->name,
3020 /* For variable length CHARACTER parameters, the PARM_DECL already
3021 references the length variable, so force gfc_get_symbol_decl
3022 even when not referenced. If optimize > 0, it will be optimized
3023 away anyway. But do this only after emitting -Wunused-parameter
3024 warning if requested. */
3025 if (sym->attr.dummy && ! sym->attr.referenced
3026 && sym->ts.type == BT_CHARACTER
3027 && sym->ts.cl->backend_decl != NULL
3028 && TREE_CODE (sym->ts.cl->backend_decl) == VAR_DECL)
3030 sym->attr.referenced = 1;
3031 gfc_get_symbol_decl (sym);
3034 /* We do not want the middle-end to warn about unused parameters
3035 as this was already done above. */
3036 if (sym->attr.dummy && sym->backend_decl != NULL_TREE)
3037 TREE_NO_WARNING(sym->backend_decl) = 1;
3039 else if (sym->attr.flavor == FL_PARAMETER)
3041 if (warn_unused_parameter
3042 && !sym->attr.referenced
3043 && !sym->attr.use_assoc)
3044 gfc_warning ("Unused parameter '%s' declared at %L", sym->name,
3048 if (sym->attr.dummy == 1)
3050 /* Modify the tree type for scalar character dummy arguments of bind(c)
3051 procedures if they are passed by value. The tree type for them will
3052 be promoted to INTEGER_TYPE for the middle end, which appears to be
3053 what C would do with characters passed by-value. The value attribute
3054 implies the dummy is a scalar. */
3055 if (sym->attr.value == 1 && sym->backend_decl != NULL
3056 && sym->ts.type == BT_CHARACTER && sym->ts.is_c_interop
3057 && sym->ns->proc_name != NULL && sym->ns->proc_name->attr.is_bind_c)
3058 TREE_TYPE (sym->backend_decl) = unsigned_char_type_node;
3061 /* Make sure we convert the types of the derived types from iso_c_binding
3063 if (sym->attr.flavor != FL_PROCEDURE && sym->attr.is_iso_c
3064 && sym->ts.type == BT_DERIVED)
3065 sym->backend_decl = gfc_typenode_for_spec (&(sym->ts));
3069 generate_local_vars (gfc_namespace * ns)
3071 gfc_traverse_ns (ns, generate_local_decl);
3075 /* Generate a switch statement to jump to the correct entry point. Also
3076 creates the label decls for the entry points. */
3079 gfc_trans_entry_master_switch (gfc_entry_list * el)
3086 gfc_init_block (&block);
3087 for (; el; el = el->next)
3089 /* Add the case label. */
3090 label = gfc_build_label_decl (NULL_TREE);
3091 val = build_int_cst (gfc_array_index_type, el->id);
3092 tmp = build3_v (CASE_LABEL_EXPR, val, NULL_TREE, label);
3093 gfc_add_expr_to_block (&block, tmp);
3095 /* And jump to the actual entry point. */
3096 label = gfc_build_label_decl (NULL_TREE);
3097 tmp = build1_v (GOTO_EXPR, label);
3098 gfc_add_expr_to_block (&block, tmp);
3100 /* Save the label decl. */
3103 tmp = gfc_finish_block (&block);
3104 /* The first argument selects the entry point. */
3105 val = DECL_ARGUMENTS (current_function_decl);
3106 tmp = build3_v (SWITCH_EXPR, val, tmp, NULL_TREE);
3111 /* Generate code for a function. */
3114 gfc_generate_function_code (gfc_namespace * ns)
3127 sym = ns->proc_name;
3129 /* Check that the frontend isn't still using this. */
3130 gcc_assert (sym->tlink == NULL);
3133 /* Create the declaration for functions with global scope. */
3134 if (!sym->backend_decl)
3135 gfc_create_function_decl (ns);
3137 fndecl = sym->backend_decl;
3138 old_context = current_function_decl;
3142 push_function_context ();
3143 saved_parent_function_decls = saved_function_decls;
3144 saved_function_decls = NULL_TREE;
3147 trans_function_start (sym);
3149 gfc_start_block (&block);
3151 if (ns->entries && ns->proc_name->ts.type == BT_CHARACTER)
3153 /* Copy length backend_decls to all entry point result
3158 gfc_conv_const_charlen (ns->proc_name->ts.cl);
3159 backend_decl = ns->proc_name->result->ts.cl->backend_decl;
3160 for (el = ns->entries; el; el = el->next)
3161 el->sym->result->ts.cl->backend_decl = backend_decl;
3164 /* Translate COMMON blocks. */
3165 gfc_trans_common (ns);
3167 /* Null the parent fake result declaration if this namespace is
3168 a module function or an external procedures. */
3169 if ((ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
3170 || ns->parent == NULL)
3171 parent_fake_result_decl = NULL_TREE;
3173 gfc_generate_contained_functions (ns);
3175 generate_local_vars (ns);
3177 /* Keep the parent fake result declaration in module functions
3178 or external procedures. */
3179 if ((ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
3180 || ns->parent == NULL)
3181 current_fake_result_decl = parent_fake_result_decl;
3183 current_fake_result_decl = NULL_TREE;
3185 current_function_return_label = NULL;
3187 /* Now generate the code for the body of this function. */
3188 gfc_init_block (&body);
3190 /* If this is the main program, add a call to set_options to set up the
3191 runtime library Fortran language standard parameters. */
3192 if (sym->attr.is_main_program)
3194 tree array_type, array, var;
3196 /* Passing a new option to the library requires four modifications:
3197 + add it to the tree_cons list below
3198 + change the array size in the call to build_array_type
3199 + change the first argument to the library call
3200 gfor_fndecl_set_options
3201 + modify the library (runtime/compile_options.c)! */
3202 array = tree_cons (NULL_TREE,
3203 build_int_cst (integer_type_node,
3204 gfc_option.warn_std), NULL_TREE);
3205 array = tree_cons (NULL_TREE,
3206 build_int_cst (integer_type_node,
3207 gfc_option.allow_std), array);
3208 array = tree_cons (NULL_TREE,
3209 build_int_cst (integer_type_node, pedantic), array);
3210 array = tree_cons (NULL_TREE,
3211 build_int_cst (integer_type_node,
3212 gfc_option.flag_dump_core), array);
3213 array = tree_cons (NULL_TREE,
3214 build_int_cst (integer_type_node,
3215 gfc_option.flag_backtrace), array);
3216 array = tree_cons (NULL_TREE,
3217 build_int_cst (integer_type_node,
3218 gfc_option.flag_sign_zero), array);
3220 array = tree_cons (NULL_TREE,
3221 build_int_cst (integer_type_node,
3222 flag_bounds_check), array);
3224 array_type = build_array_type (integer_type_node,
3225 build_index_type (build_int_cst (NULL_TREE,
3227 array = build_constructor_from_list (array_type, nreverse (array));
3228 TREE_CONSTANT (array) = 1;
3229 TREE_INVARIANT (array) = 1;
3230 TREE_STATIC (array) = 1;
3232 /* Create a static variable to hold the jump table. */
3233 var = gfc_create_var (array_type, "options");
3234 TREE_CONSTANT (var) = 1;
3235 TREE_INVARIANT (var) = 1;
3236 TREE_STATIC (var) = 1;
3237 TREE_READONLY (var) = 1;
3238 DECL_INITIAL (var) = array;
3239 var = gfc_build_addr_expr (pvoid_type_node, var);
3241 tmp = build_call_expr (gfor_fndecl_set_options, 2,
3242 build_int_cst (integer_type_node, 7), var);
3243 gfc_add_expr_to_block (&body, tmp);
3246 /* If this is the main program and a -ffpe-trap option was provided,
3247 add a call to set_fpe so that the library will raise a FPE when
3249 if (sym->attr.is_main_program && gfc_option.fpe != 0)
3251 tmp = build_call_expr (gfor_fndecl_set_fpe, 1,
3252 build_int_cst (integer_type_node,
3254 gfc_add_expr_to_block (&body, tmp);
3257 /* If this is the main program and an -fconvert option was provided,
3258 add a call to set_convert. */
3260 if (sym->attr.is_main_program && gfc_option.convert != CONVERT_NATIVE)
3262 tmp = build_call_expr (gfor_fndecl_set_convert, 1,
3263 build_int_cst (integer_type_node,
3264 gfc_option.convert));
3265 gfc_add_expr_to_block (&body, tmp);
3268 /* If this is the main program and an -frecord-marker option was provided,
3269 add a call to set_record_marker. */
3271 if (sym->attr.is_main_program && gfc_option.record_marker != 0)
3273 tmp = build_call_expr (gfor_fndecl_set_record_marker, 1,
3274 build_int_cst (integer_type_node,
3275 gfc_option.record_marker));
3276 gfc_add_expr_to_block (&body, tmp);
3279 if (sym->attr.is_main_program && gfc_option.max_subrecord_length != 0)
3281 tmp = build_call_expr (gfor_fndecl_set_max_subrecord_length,
3283 build_int_cst (integer_type_node,
3284 gfc_option.max_subrecord_length));
3285 gfc_add_expr_to_block (&body, tmp);
3288 if (TREE_TYPE (DECL_RESULT (fndecl)) != void_type_node
3289 && sym->attr.subroutine)
3291 tree alternate_return;
3292 alternate_return = gfc_get_fake_result_decl (sym, 0);
3293 gfc_add_modify_expr (&body, alternate_return, integer_zero_node);
3298 /* Jump to the correct entry point. */
3299 tmp = gfc_trans_entry_master_switch (ns->entries);
3300 gfc_add_expr_to_block (&body, tmp);
3303 tmp = gfc_trans_code (ns->code);
3304 gfc_add_expr_to_block (&body, tmp);
3306 /* Add a return label if needed. */
3307 if (current_function_return_label)
3309 tmp = build1_v (LABEL_EXPR, current_function_return_label);
3310 gfc_add_expr_to_block (&body, tmp);
3313 tmp = gfc_finish_block (&body);
3314 /* Add code to create and cleanup arrays. */
3315 tmp = gfc_trans_deferred_vars (sym, tmp);
3317 if (TREE_TYPE (DECL_RESULT (fndecl)) != void_type_node)
3319 if (sym->attr.subroutine || sym == sym->result)
3321 if (current_fake_result_decl != NULL)
3322 result = TREE_VALUE (current_fake_result_decl);
3325 current_fake_result_decl = NULL_TREE;
3328 result = sym->result->backend_decl;
3330 if (result != NULL_TREE && sym->attr.function
3331 && sym->ts.type == BT_DERIVED
3332 && sym->ts.derived->attr.alloc_comp
3333 && !sym->attr.pointer)
3335 rank = sym->as ? sym->as->rank : 0;
3336 tmp2 = gfc_nullify_alloc_comp (sym->ts.derived, result, rank);
3337 gfc_add_expr_to_block (&block, tmp2);
3340 gfc_add_expr_to_block (&block, tmp);
3342 if (result == NULL_TREE)
3343 warning (0, "Function return value not set");
3346 /* Set the return value to the dummy result variable. The
3347 types may be different for scalar default REAL functions
3348 with -ff2c, therefore we have to convert. */
3349 tmp = convert (TREE_TYPE (DECL_RESULT (fndecl)), result);
3350 tmp = build2 (MODIFY_EXPR, TREE_TYPE (tmp),
3351 DECL_RESULT (fndecl), tmp);
3352 tmp = build1_v (RETURN_EXPR, tmp);
3353 gfc_add_expr_to_block (&block, tmp);
3357 gfc_add_expr_to_block (&block, tmp);
3360 /* Add all the decls we created during processing. */
3361 decl = saved_function_decls;
3366 next = TREE_CHAIN (decl);
3367 TREE_CHAIN (decl) = NULL_TREE;
3371 saved_function_decls = NULL_TREE;
3373 DECL_SAVED_TREE (fndecl) = gfc_finish_block (&block);
3375 /* Finish off this function and send it for code generation. */
3377 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
3379 /* Output the GENERIC tree. */
3380 dump_function (TDI_original, fndecl);
3382 /* Store the end of the function, so that we get good line number
3383 info for the epilogue. */
3384 cfun->function_end_locus = input_location;
3386 /* We're leaving the context of this function, so zap cfun.
3387 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
3388 tree_rest_of_compilation. */
3393 pop_function_context ();
3394 saved_function_decls = saved_parent_function_decls;
3396 current_function_decl = old_context;
3398 if (decl_function_context (fndecl))
3399 /* Register this function with cgraph just far enough to get it
3400 added to our parent's nested function list. */
3401 (void) cgraph_node (fndecl);
3404 gfc_gimplify_function (fndecl);
3405 cgraph_finalize_function (fndecl, false);
3410 gfc_generate_constructors (void)
3412 gcc_assert (gfc_static_ctors == NULL_TREE);
3420 if (gfc_static_ctors == NULL_TREE)
3423 fnname = get_file_function_name ("I");
3424 type = build_function_type (void_type_node,
3425 gfc_chainon_list (NULL_TREE, void_type_node));
3427 fndecl = build_decl (FUNCTION_DECL, fnname, type);
3428 TREE_PUBLIC (fndecl) = 1;
3430 decl = build_decl (RESULT_DECL, NULL_TREE, void_type_node);
3431 DECL_ARTIFICIAL (decl) = 1;
3432 DECL_IGNORED_P (decl) = 1;
3433 DECL_CONTEXT (decl) = fndecl;
3434 DECL_RESULT (fndecl) = decl;
3438 current_function_decl = fndecl;
3440 rest_of_decl_compilation (fndecl, 1, 0);
3442 make_decl_rtl (fndecl);
3444 init_function_start (fndecl);
3448 for (; gfc_static_ctors; gfc_static_ctors = TREE_CHAIN (gfc_static_ctors))
3450 tmp = build_call_expr (TREE_VALUE (gfc_static_ctors), 0);
3451 DECL_SAVED_TREE (fndecl) = build_stmt (EXPR_STMT, tmp);
3456 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
3458 free_after_parsing (cfun);
3459 free_after_compilation (cfun);
3461 tree_rest_of_compilation (fndecl);
3463 current_function_decl = NULL_TREE;
3467 /* Translates a BLOCK DATA program unit. This means emitting the
3468 commons contained therein plus their initializations. We also emit
3469 a globally visible symbol to make sure that each BLOCK DATA program
3470 unit remains unique. */
3473 gfc_generate_block_data (gfc_namespace * ns)
3478 /* Tell the backend the source location of the block data. */
3480 gfc_set_backend_locus (&ns->proc_name->declared_at);
3482 gfc_set_backend_locus (&gfc_current_locus);
3484 /* Process the DATA statements. */
3485 gfc_trans_common (ns);
3487 /* Create a global symbol with the mane of the block data. This is to
3488 generate linker errors if the same name is used twice. It is never
3491 id = gfc_sym_mangled_function_id (ns->proc_name);
3493 id = get_identifier ("__BLOCK_DATA__");
3495 decl = build_decl (VAR_DECL, id, gfc_array_index_type);
3496 TREE_PUBLIC (decl) = 1;
3497 TREE_STATIC (decl) = 1;
3500 rest_of_decl_compilation (decl, 1, 0);
3504 #include "gt-fortran-trans-decl.h"