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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
23 /* trans-decl.c -- Handling of backend function and variable decls, etc */
27 #include "coretypes.h"
29 #include "tree-dump.h"
30 #include "tree-gimple.h"
41 #include "trans-types.h"
42 #include "trans-array.h"
43 #include "trans-const.h"
44 /* Only for gfc_trans_code. Shouldn't need to include this. */
45 #include "trans-stmt.h"
47 #define MAX_LABEL_VALUE 99999
50 /* Holds the result of the function if no result variable specified. */
52 static GTY(()) tree current_fake_result_decl;
53 static GTY(()) tree parent_fake_result_decl;
55 static GTY(()) tree current_function_return_label;
58 /* Holds the variable DECLs for the current function. */
60 static GTY(()) tree saved_function_decls;
61 static GTY(()) tree saved_parent_function_decls;
64 /* The namespace of the module we're currently generating. Only used while
65 outputting decls for module variables. Do not rely on this being set. */
67 static gfc_namespace *module_namespace;
70 /* List of static constructor functions. */
72 tree gfc_static_ctors;
75 /* Function declarations for builtin library functions. */
77 tree gfor_fndecl_internal_realloc;
78 tree gfor_fndecl_allocate;
79 tree gfor_fndecl_allocate_array;
80 tree gfor_fndecl_deallocate;
81 tree gfor_fndecl_pause_numeric;
82 tree gfor_fndecl_pause_string;
83 tree gfor_fndecl_stop_numeric;
84 tree gfor_fndecl_stop_string;
85 tree gfor_fndecl_select_string;
86 tree gfor_fndecl_runtime_error;
87 tree gfor_fndecl_runtime_error_at;
88 tree gfor_fndecl_os_error;
89 tree gfor_fndecl_generate_error;
90 tree gfor_fndecl_set_fpe;
91 tree gfor_fndecl_set_options;
92 tree gfor_fndecl_set_convert;
93 tree gfor_fndecl_set_record_marker;
94 tree gfor_fndecl_set_max_subrecord_length;
95 tree gfor_fndecl_ctime;
96 tree gfor_fndecl_fdate;
97 tree gfor_fndecl_ttynam;
98 tree gfor_fndecl_in_pack;
99 tree gfor_fndecl_in_unpack;
100 tree gfor_fndecl_associated;
103 /* Math functions. Many other math functions are handled in
104 trans-intrinsic.c. */
106 gfc_powdecl_list gfor_fndecl_math_powi[4][3];
107 tree gfor_fndecl_math_cpowf;
108 tree gfor_fndecl_math_cpow;
109 tree gfor_fndecl_math_cpowl10;
110 tree gfor_fndecl_math_cpowl16;
111 tree gfor_fndecl_math_ishftc4;
112 tree gfor_fndecl_math_ishftc8;
113 tree gfor_fndecl_math_ishftc16;
114 tree gfor_fndecl_math_exponent4;
115 tree gfor_fndecl_math_exponent8;
116 tree gfor_fndecl_math_exponent10;
117 tree gfor_fndecl_math_exponent16;
120 /* String functions. */
122 tree gfor_fndecl_compare_string;
123 tree gfor_fndecl_concat_string;
124 tree gfor_fndecl_string_len_trim;
125 tree gfor_fndecl_string_index;
126 tree gfor_fndecl_string_scan;
127 tree gfor_fndecl_string_verify;
128 tree gfor_fndecl_string_trim;
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_ttynam =
2052 gfc_build_library_function_decl (get_identifier (PREFIX("ttynam")),
2056 gfc_charlen_type_node,
2060 gfc_build_library_function_decl (get_identifier (PREFIX("fdate")),
2064 gfc_charlen_type_node);
2067 gfc_build_library_function_decl (get_identifier (PREFIX("ctime")),
2071 gfc_charlen_type_node,
2072 gfc_int8_type_node);
2074 gfor_fndecl_adjustl =
2075 gfc_build_library_function_decl (get_identifier (PREFIX("adjustl")),
2079 gfc_charlen_type_node, pchar_type_node);
2081 gfor_fndecl_adjustr =
2082 gfc_build_library_function_decl (get_identifier (PREFIX("adjustr")),
2086 gfc_charlen_type_node, pchar_type_node);
2088 gfor_fndecl_si_kind =
2089 gfc_build_library_function_decl (get_identifier
2090 (PREFIX("selected_int_kind")),
2095 gfor_fndecl_sr_kind =
2096 gfc_build_library_function_decl (get_identifier
2097 (PREFIX("selected_real_kind")),
2102 /* Power functions. */
2104 tree ctype, rtype, itype, jtype;
2105 int rkind, ikind, jkind;
2108 static int ikinds[NIKINDS] = {4, 8, 16};
2109 static int rkinds[NRKINDS] = {4, 8, 10, 16};
2110 char name[PREFIX_LEN + 12]; /* _gfortran_pow_?n_?n */
2112 for (ikind=0; ikind < NIKINDS; ikind++)
2114 itype = gfc_get_int_type (ikinds[ikind]);
2116 for (jkind=0; jkind < NIKINDS; jkind++)
2118 jtype = gfc_get_int_type (ikinds[jkind]);
2121 sprintf(name, PREFIX("pow_i%d_i%d"), ikinds[ikind],
2123 gfor_fndecl_math_powi[jkind][ikind].integer =
2124 gfc_build_library_function_decl (get_identifier (name),
2125 jtype, 2, jtype, itype);
2126 TREE_READONLY (gfor_fndecl_math_powi[jkind][ikind].integer) = 1;
2130 for (rkind = 0; rkind < NRKINDS; rkind ++)
2132 rtype = gfc_get_real_type (rkinds[rkind]);
2135 sprintf(name, PREFIX("pow_r%d_i%d"), rkinds[rkind],
2137 gfor_fndecl_math_powi[rkind][ikind].real =
2138 gfc_build_library_function_decl (get_identifier (name),
2139 rtype, 2, rtype, itype);
2140 TREE_READONLY (gfor_fndecl_math_powi[rkind][ikind].real) = 1;
2143 ctype = gfc_get_complex_type (rkinds[rkind]);
2146 sprintf(name, PREFIX("pow_c%d_i%d"), rkinds[rkind],
2148 gfor_fndecl_math_powi[rkind][ikind].cmplx =
2149 gfc_build_library_function_decl (get_identifier (name),
2150 ctype, 2,ctype, itype);
2151 TREE_READONLY (gfor_fndecl_math_powi[rkind][ikind].cmplx) = 1;
2159 gfor_fndecl_math_cpowf =
2160 gfc_build_library_function_decl (get_identifier ("cpowf"),
2161 gfc_complex4_type_node,
2162 1, gfc_complex4_type_node);
2163 gfor_fndecl_math_cpow =
2164 gfc_build_library_function_decl (get_identifier ("cpow"),
2165 gfc_complex8_type_node,
2166 1, gfc_complex8_type_node);
2167 if (gfc_complex10_type_node)
2168 gfor_fndecl_math_cpowl10 =
2169 gfc_build_library_function_decl (get_identifier ("cpowl"),
2170 gfc_complex10_type_node, 1,
2171 gfc_complex10_type_node);
2172 if (gfc_complex16_type_node)
2173 gfor_fndecl_math_cpowl16 =
2174 gfc_build_library_function_decl (get_identifier ("cpowl"),
2175 gfc_complex16_type_node, 1,
2176 gfc_complex16_type_node);
2178 gfor_fndecl_math_ishftc4 =
2179 gfc_build_library_function_decl (get_identifier (PREFIX("ishftc4")),
2181 3, gfc_int4_type_node,
2182 gfc_int4_type_node, gfc_int4_type_node);
2183 gfor_fndecl_math_ishftc8 =
2184 gfc_build_library_function_decl (get_identifier (PREFIX("ishftc8")),
2186 3, gfc_int8_type_node,
2187 gfc_int4_type_node, gfc_int4_type_node);
2188 if (gfc_int16_type_node)
2189 gfor_fndecl_math_ishftc16 =
2190 gfc_build_library_function_decl (get_identifier (PREFIX("ishftc16")),
2191 gfc_int16_type_node, 3,
2192 gfc_int16_type_node,
2194 gfc_int4_type_node);
2196 gfor_fndecl_math_exponent4 =
2197 gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r4")),
2199 1, gfc_real4_type_node);
2200 gfor_fndecl_math_exponent8 =
2201 gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r8")),
2203 1, gfc_real8_type_node);
2204 if (gfc_real10_type_node)
2205 gfor_fndecl_math_exponent10 =
2206 gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r10")),
2207 gfc_int4_type_node, 1,
2208 gfc_real10_type_node);
2209 if (gfc_real16_type_node)
2210 gfor_fndecl_math_exponent16 =
2211 gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r16")),
2212 gfc_int4_type_node, 1,
2213 gfc_real16_type_node);
2215 /* BLAS functions. */
2217 tree pint = build_pointer_type (integer_type_node);
2218 tree ps = build_pointer_type (gfc_get_real_type (gfc_default_real_kind));
2219 tree pd = build_pointer_type (gfc_get_real_type (gfc_default_double_kind));
2220 tree pc = build_pointer_type (gfc_get_complex_type (gfc_default_real_kind));
2221 tree pz = build_pointer_type
2222 (gfc_get_complex_type (gfc_default_double_kind));
2224 gfor_fndecl_sgemm = gfc_build_library_function_decl
2226 (gfc_option.flag_underscoring ? "sgemm_"
2228 void_type_node, 15, pchar_type_node,
2229 pchar_type_node, pint, pint, pint, ps, ps, pint,
2230 ps, pint, ps, ps, pint, integer_type_node,
2232 gfor_fndecl_dgemm = gfc_build_library_function_decl
2234 (gfc_option.flag_underscoring ? "dgemm_"
2236 void_type_node, 15, pchar_type_node,
2237 pchar_type_node, pint, pint, pint, pd, pd, pint,
2238 pd, pint, pd, pd, pint, integer_type_node,
2240 gfor_fndecl_cgemm = gfc_build_library_function_decl
2242 (gfc_option.flag_underscoring ? "cgemm_"
2244 void_type_node, 15, pchar_type_node,
2245 pchar_type_node, pint, pint, pint, pc, pc, pint,
2246 pc, pint, pc, pc, pint, integer_type_node,
2248 gfor_fndecl_zgemm = gfc_build_library_function_decl
2250 (gfc_option.flag_underscoring ? "zgemm_"
2252 void_type_node, 15, pchar_type_node,
2253 pchar_type_node, pint, pint, pint, pz, pz, pint,
2254 pz, pint, pz, pz, pint, integer_type_node,
2258 /* Other functions. */
2260 gfc_build_library_function_decl (get_identifier (PREFIX("size0")),
2261 gfc_array_index_type,
2262 1, pvoid_type_node);
2264 gfc_build_library_function_decl (get_identifier (PREFIX("size1")),
2265 gfc_array_index_type,
2267 gfc_array_index_type);
2270 gfc_build_library_function_decl (get_identifier (PREFIX ("iargc")),
2276 /* Make prototypes for runtime library functions. */
2279 gfc_build_builtin_function_decls (void)
2281 tree gfc_int4_type_node = gfc_get_int_type (4);
2282 tree gfc_logical4_type_node = gfc_get_logical_type (4);
2283 tree gfc_pint4_type_node = build_pointer_type (gfc_int4_type_node);
2285 gfor_fndecl_internal_realloc =
2286 gfc_build_library_function_decl (get_identifier
2287 (PREFIX("internal_realloc")),
2288 pvoid_type_node, 2, pvoid_type_node,
2289 gfc_array_index_type);
2291 gfor_fndecl_allocate =
2292 gfc_build_library_function_decl (get_identifier (PREFIX("allocate")),
2294 gfc_array_index_type, gfc_pint4_type_node);
2295 DECL_IS_MALLOC (gfor_fndecl_allocate) = 1;
2297 gfor_fndecl_allocate_array =
2298 gfc_build_library_function_decl (get_identifier (PREFIX("allocate_array")),
2299 pvoid_type_node, 3, pvoid_type_node,
2300 gfc_array_index_type, gfc_pint4_type_node);
2301 DECL_IS_MALLOC (gfor_fndecl_allocate_array) = 1;
2303 gfor_fndecl_deallocate =
2304 gfc_build_library_function_decl (get_identifier (PREFIX("deallocate")),
2305 void_type_node, 2, pvoid_type_node,
2306 gfc_pint4_type_node);
2308 gfor_fndecl_stop_numeric =
2309 gfc_build_library_function_decl (get_identifier (PREFIX("stop_numeric")),
2310 void_type_node, 1, gfc_int4_type_node);
2312 /* Stop doesn't return. */
2313 TREE_THIS_VOLATILE (gfor_fndecl_stop_numeric) = 1;
2315 gfor_fndecl_stop_string =
2316 gfc_build_library_function_decl (get_identifier (PREFIX("stop_string")),
2317 void_type_node, 2, pchar_type_node,
2318 gfc_int4_type_node);
2319 /* Stop doesn't return. */
2320 TREE_THIS_VOLATILE (gfor_fndecl_stop_string) = 1;
2322 gfor_fndecl_pause_numeric =
2323 gfc_build_library_function_decl (get_identifier (PREFIX("pause_numeric")),
2324 void_type_node, 1, gfc_int4_type_node);
2326 gfor_fndecl_pause_string =
2327 gfc_build_library_function_decl (get_identifier (PREFIX("pause_string")),
2328 void_type_node, 2, pchar_type_node,
2329 gfc_int4_type_node);
2331 gfor_fndecl_select_string =
2332 gfc_build_library_function_decl (get_identifier (PREFIX("select_string")),
2333 integer_type_node, 0);
2335 gfor_fndecl_runtime_error =
2336 gfc_build_library_function_decl (get_identifier (PREFIX("runtime_error")),
2337 void_type_node, 1, pchar_type_node);
2338 /* The runtime_error function does not return. */
2339 TREE_THIS_VOLATILE (gfor_fndecl_runtime_error) = 1;
2341 gfor_fndecl_runtime_error_at =
2342 gfc_build_library_function_decl (get_identifier (PREFIX("runtime_error_at")),
2343 void_type_node, 2, pchar_type_node,
2345 /* The runtime_error_at function does not return. */
2346 TREE_THIS_VOLATILE (gfor_fndecl_runtime_error_at) = 1;
2348 gfor_fndecl_generate_error =
2349 gfc_build_library_function_decl (get_identifier (PREFIX("generate_error")),
2350 void_type_node, 3, pvoid_type_node,
2351 integer_type_node, pchar_type_node);
2353 gfor_fndecl_os_error =
2354 gfc_build_library_function_decl (get_identifier (PREFIX("os_error")),
2355 void_type_node, 1, pchar_type_node);
2356 /* The runtime_error function does not return. */
2357 TREE_THIS_VOLATILE (gfor_fndecl_os_error) = 1;
2359 gfor_fndecl_set_fpe =
2360 gfc_build_library_function_decl (get_identifier (PREFIX("set_fpe")),
2361 void_type_node, 1, integer_type_node);
2363 /* Keep the array dimension in sync with the call, later in this file. */
2364 gfor_fndecl_set_options =
2365 gfc_build_library_function_decl (get_identifier (PREFIX("set_options")),
2366 void_type_node, 2, integer_type_node,
2369 gfor_fndecl_set_convert =
2370 gfc_build_library_function_decl (get_identifier (PREFIX("set_convert")),
2371 void_type_node, 1, integer_type_node);
2373 gfor_fndecl_set_record_marker =
2374 gfc_build_library_function_decl (get_identifier (PREFIX("set_record_marker")),
2375 void_type_node, 1, integer_type_node);
2377 gfor_fndecl_set_max_subrecord_length =
2378 gfc_build_library_function_decl (get_identifier (PREFIX("set_max_subrecord_length")),
2379 void_type_node, 1, integer_type_node);
2381 gfor_fndecl_in_pack = gfc_build_library_function_decl (
2382 get_identifier (PREFIX("internal_pack")),
2383 pvoid_type_node, 1, pvoid_type_node);
2385 gfor_fndecl_in_unpack = gfc_build_library_function_decl (
2386 get_identifier (PREFIX("internal_unpack")),
2387 pvoid_type_node, 1, pvoid_type_node);
2389 gfor_fndecl_associated =
2390 gfc_build_library_function_decl (
2391 get_identifier (PREFIX("associated")),
2392 gfc_logical4_type_node,
2397 gfc_build_intrinsic_function_decls ();
2398 gfc_build_intrinsic_lib_fndecls ();
2399 gfc_build_io_library_fndecls ();
2403 /* Evaluate the length of dummy character variables. */
2406 gfc_trans_dummy_character (gfc_symbol *sym, gfc_charlen *cl, tree fnbody)
2410 gfc_finish_decl (cl->backend_decl);
2412 gfc_start_block (&body);
2414 /* Evaluate the string length expression. */
2415 gfc_trans_init_string_length (cl, &body);
2417 gfc_trans_vla_type_sizes (sym, &body);
2419 gfc_add_expr_to_block (&body, fnbody);
2420 return gfc_finish_block (&body);
2424 /* Allocate and cleanup an automatic character variable. */
2427 gfc_trans_auto_character_variable (gfc_symbol * sym, tree fnbody)
2433 gcc_assert (sym->backend_decl);
2434 gcc_assert (sym->ts.cl && sym->ts.cl->length);
2436 gfc_start_block (&body);
2438 /* Evaluate the string length expression. */
2439 gfc_trans_init_string_length (sym->ts.cl, &body);
2441 gfc_trans_vla_type_sizes (sym, &body);
2443 decl = sym->backend_decl;
2445 /* Emit a DECL_EXPR for this variable, which will cause the
2446 gimplifier to allocate storage, and all that good stuff. */
2447 tmp = build1 (DECL_EXPR, TREE_TYPE (decl), decl);
2448 gfc_add_expr_to_block (&body, tmp);
2450 gfc_add_expr_to_block (&body, fnbody);
2451 return gfc_finish_block (&body);
2454 /* Set the initial value of ASSIGN statement auxiliary variable explicitly. */
2457 gfc_trans_assign_aux_var (gfc_symbol * sym, tree fnbody)
2461 gcc_assert (sym->backend_decl);
2462 gfc_start_block (&body);
2464 /* Set the initial value to length. See the comments in
2465 function gfc_add_assign_aux_vars in this file. */
2466 gfc_add_modify_expr (&body, GFC_DECL_STRING_LEN (sym->backend_decl),
2467 build_int_cst (NULL_TREE, -2));
2469 gfc_add_expr_to_block (&body, fnbody);
2470 return gfc_finish_block (&body);
2474 gfc_trans_vla_one_sizepos (tree *tp, stmtblock_t *body)
2476 tree t = *tp, var, val;
2478 if (t == NULL || t == error_mark_node)
2480 if (TREE_CONSTANT (t) || DECL_P (t))
2483 if (TREE_CODE (t) == SAVE_EXPR)
2485 if (SAVE_EXPR_RESOLVED_P (t))
2487 *tp = TREE_OPERAND (t, 0);
2490 val = TREE_OPERAND (t, 0);
2495 var = gfc_create_var_np (TREE_TYPE (t), NULL);
2496 gfc_add_decl_to_function (var);
2497 gfc_add_modify_expr (body, var, val);
2498 if (TREE_CODE (t) == SAVE_EXPR)
2499 TREE_OPERAND (t, 0) = var;
2504 gfc_trans_vla_type_sizes_1 (tree type, stmtblock_t *body)
2508 if (type == NULL || type == error_mark_node)
2511 type = TYPE_MAIN_VARIANT (type);
2513 if (TREE_CODE (type) == INTEGER_TYPE)
2515 gfc_trans_vla_one_sizepos (&TYPE_MIN_VALUE (type), body);
2516 gfc_trans_vla_one_sizepos (&TYPE_MAX_VALUE (type), body);
2518 for (t = TYPE_NEXT_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
2520 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (type);
2521 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (type);
2524 else if (TREE_CODE (type) == ARRAY_TYPE)
2526 gfc_trans_vla_type_sizes_1 (TREE_TYPE (type), body);
2527 gfc_trans_vla_type_sizes_1 (TYPE_DOMAIN (type), body);
2528 gfc_trans_vla_one_sizepos (&TYPE_SIZE (type), body);
2529 gfc_trans_vla_one_sizepos (&TYPE_SIZE_UNIT (type), body);
2531 for (t = TYPE_NEXT_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
2533 TYPE_SIZE (t) = TYPE_SIZE (type);
2534 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (type);
2539 /* Make sure all type sizes and array domains are either constant,
2540 or variable or parameter decls. This is a simplified variant
2541 of gimplify_type_sizes, but we can't use it here, as none of the
2542 variables in the expressions have been gimplified yet.
2543 As type sizes and domains for various variable length arrays
2544 contain VAR_DECLs that are only initialized at gfc_trans_deferred_vars
2545 time, without this routine gimplify_type_sizes in the middle-end
2546 could result in the type sizes being gimplified earlier than where
2547 those variables are initialized. */
2550 gfc_trans_vla_type_sizes (gfc_symbol *sym, stmtblock_t *body)
2552 tree type = TREE_TYPE (sym->backend_decl);
2554 if (TREE_CODE (type) == FUNCTION_TYPE
2555 && (sym->attr.function || sym->attr.result || sym->attr.entry))
2557 if (! current_fake_result_decl)
2560 type = TREE_TYPE (TREE_VALUE (current_fake_result_decl));
2563 while (POINTER_TYPE_P (type))
2564 type = TREE_TYPE (type);
2566 if (GFC_DESCRIPTOR_TYPE_P (type))
2568 tree etype = GFC_TYPE_ARRAY_DATAPTR_TYPE (type);
2570 while (POINTER_TYPE_P (etype))
2571 etype = TREE_TYPE (etype);
2573 gfc_trans_vla_type_sizes_1 (etype, body);
2576 gfc_trans_vla_type_sizes_1 (type, body);
2580 /* Generate function entry and exit code, and add it to the function body.
2582 Allocation and initialization of array variables.
2583 Allocation of character string variables.
2584 Initialization and possibly repacking of dummy arrays.
2585 Initialization of ASSIGN statement auxiliary variable. */
2588 gfc_trans_deferred_vars (gfc_symbol * proc_sym, tree fnbody)
2592 gfc_formal_arglist *f;
2594 bool seen_trans_deferred_array = false;
2596 /* Deal with implicit return variables. Explicit return variables will
2597 already have been added. */
2598 if (gfc_return_by_reference (proc_sym) && proc_sym->result == proc_sym)
2600 if (!current_fake_result_decl)
2602 gfc_entry_list *el = NULL;
2603 if (proc_sym->attr.entry_master)
2605 for (el = proc_sym->ns->entries; el; el = el->next)
2606 if (el->sym != el->sym->result)
2610 warning (0, "Function does not return a value");
2612 else if (proc_sym->as)
2614 tree result = TREE_VALUE (current_fake_result_decl);
2615 fnbody = gfc_trans_dummy_array_bias (proc_sym, result, fnbody);
2617 /* An automatic character length, pointer array result. */
2618 if (proc_sym->ts.type == BT_CHARACTER
2619 && TREE_CODE (proc_sym->ts.cl->backend_decl) == VAR_DECL)
2620 fnbody = gfc_trans_dummy_character (proc_sym, proc_sym->ts.cl,
2623 else if (proc_sym->ts.type == BT_CHARACTER)
2625 if (TREE_CODE (proc_sym->ts.cl->backend_decl) == VAR_DECL)
2626 fnbody = gfc_trans_dummy_character (proc_sym, proc_sym->ts.cl,
2630 gcc_assert (gfc_option.flag_f2c
2631 && proc_sym->ts.type == BT_COMPLEX);
2634 for (sym = proc_sym->tlink; sym != proc_sym; sym = sym->tlink)
2636 bool sym_has_alloc_comp = (sym->ts.type == BT_DERIVED)
2637 && sym->ts.derived->attr.alloc_comp;
2638 if (sym->attr.dimension)
2640 switch (sym->as->type)
2643 if (sym->attr.dummy || sym->attr.result)
2645 gfc_trans_dummy_array_bias (sym, sym->backend_decl, fnbody);
2646 else if (sym->attr.pointer || sym->attr.allocatable)
2648 if (TREE_STATIC (sym->backend_decl))
2649 gfc_trans_static_array_pointer (sym);
2652 seen_trans_deferred_array = true;
2653 fnbody = gfc_trans_deferred_array (sym, fnbody);
2658 if (sym_has_alloc_comp)
2660 seen_trans_deferred_array = true;
2661 fnbody = gfc_trans_deferred_array (sym, fnbody);
2664 gfc_get_backend_locus (&loc);
2665 gfc_set_backend_locus (&sym->declared_at);
2666 fnbody = gfc_trans_auto_array_allocation (sym->backend_decl,
2668 gfc_set_backend_locus (&loc);
2672 case AS_ASSUMED_SIZE:
2673 /* Must be a dummy parameter. */
2674 gcc_assert (sym->attr.dummy);
2676 /* We should always pass assumed size arrays the g77 way. */
2677 fnbody = gfc_trans_g77_array (sym, fnbody);
2680 case AS_ASSUMED_SHAPE:
2681 /* Must be a dummy parameter. */
2682 gcc_assert (sym->attr.dummy);
2684 fnbody = gfc_trans_dummy_array_bias (sym, sym->backend_decl,
2689 seen_trans_deferred_array = true;
2690 fnbody = gfc_trans_deferred_array (sym, fnbody);
2696 if (sym_has_alloc_comp && !seen_trans_deferred_array)
2697 fnbody = gfc_trans_deferred_array (sym, fnbody);
2699 else if (sym_has_alloc_comp)
2700 fnbody = gfc_trans_deferred_array (sym, fnbody);
2701 else if (sym->ts.type == BT_CHARACTER)
2703 gfc_get_backend_locus (&loc);
2704 gfc_set_backend_locus (&sym->declared_at);
2705 if (sym->attr.dummy || sym->attr.result)
2706 fnbody = gfc_trans_dummy_character (sym, sym->ts.cl, fnbody);
2708 fnbody = gfc_trans_auto_character_variable (sym, fnbody);
2709 gfc_set_backend_locus (&loc);
2711 else if (sym->attr.assign)
2713 gfc_get_backend_locus (&loc);
2714 gfc_set_backend_locus (&sym->declared_at);
2715 fnbody = gfc_trans_assign_aux_var (sym, fnbody);
2716 gfc_set_backend_locus (&loc);
2722 gfc_init_block (&body);
2724 for (f = proc_sym->formal; f; f = f->next)
2726 if (f->sym && f->sym->tlink == NULL && f->sym->ts.type == BT_CHARACTER)
2728 gcc_assert (f->sym->ts.cl->backend_decl != NULL);
2729 if (TREE_CODE (f->sym->ts.cl->backend_decl) == PARM_DECL)
2730 gfc_trans_vla_type_sizes (f->sym, &body);
2733 /* If an INTENT(OUT) dummy of derived type has a default
2734 initializer, it must be initialized here. */
2735 if (f->sym && f->sym->attr.intent == INTENT_OUT
2736 && f->sym->ts.type == BT_DERIVED
2737 && !f->sym->ts.derived->attr.alloc_comp
2742 gcc_assert (!f->sym->attr.allocatable);
2743 gfc_set_sym_referenced (f->sym);
2744 tmpe = gfc_lval_expr_from_sym (f->sym);
2745 tmp = gfc_trans_assignment (tmpe, f->sym->value, false);
2747 present = gfc_conv_expr_present (f->sym);
2748 tmp = build3 (COND_EXPR, TREE_TYPE (tmp), present,
2749 tmp, build_empty_stmt ());
2750 gfc_add_expr_to_block (&body, tmp);
2751 gfc_free_expr (tmpe);
2755 if (gfc_return_by_reference (proc_sym) && proc_sym->ts.type == BT_CHARACTER
2756 && current_fake_result_decl != NULL)
2758 gcc_assert (proc_sym->ts.cl->backend_decl != NULL);
2759 if (TREE_CODE (proc_sym->ts.cl->backend_decl) == PARM_DECL)
2760 gfc_trans_vla_type_sizes (proc_sym, &body);
2763 gfc_add_expr_to_block (&body, fnbody);
2764 return gfc_finish_block (&body);
2768 /* Output an initialized decl for a module variable. */
2771 gfc_create_module_variable (gfc_symbol * sym)
2775 /* Module functions with alternate entries are dealt with later and
2776 would get caught by the next condition. */
2777 if (sym->attr.entry)
2780 /* Make sure we convert the types of the derived types from iso_c_binding
2782 if (sym->attr.flavor != FL_PROCEDURE && sym->attr.is_iso_c
2783 && sym->ts.type == BT_DERIVED)
2784 sym->backend_decl = gfc_typenode_for_spec (&(sym->ts));
2786 /* Only output variables and array valued parameters. */
2787 if (sym->attr.flavor != FL_VARIABLE
2788 && (sym->attr.flavor != FL_PARAMETER || sym->attr.dimension == 0))
2791 /* Don't generate variables from other modules. Variables from
2792 COMMONs will already have been generated. */
2793 if (sym->attr.use_assoc || sym->attr.in_common)
2796 /* Equivalenced variables arrive here after creation. */
2797 if (sym->backend_decl
2798 && (sym->equiv_built || sym->attr.in_equivalence))
2801 if (sym->backend_decl)
2802 internal_error ("backend decl for module variable %s already exists",
2805 /* We always want module variables to be created. */
2806 sym->attr.referenced = 1;
2807 /* Create the decl. */
2808 decl = gfc_get_symbol_decl (sym);
2810 /* Create the variable. */
2812 rest_of_decl_compilation (decl, 1, 0);
2814 /* Also add length of strings. */
2815 if (sym->ts.type == BT_CHARACTER)
2819 length = sym->ts.cl->backend_decl;
2820 if (!INTEGER_CST_P (length))
2823 rest_of_decl_compilation (length, 1, 0);
2829 /* Generate all the required code for module variables. */
2832 gfc_generate_module_vars (gfc_namespace * ns)
2834 module_namespace = ns;
2836 /* Check if the frontend left the namespace in a reasonable state. */
2837 gcc_assert (ns->proc_name && !ns->proc_name->tlink);
2839 /* Generate COMMON blocks. */
2840 gfc_trans_common (ns);
2842 /* Create decls for all the module variables. */
2843 gfc_traverse_ns (ns, gfc_create_module_variable);
2847 gfc_generate_contained_functions (gfc_namespace * parent)
2851 /* We create all the prototypes before generating any code. */
2852 for (ns = parent->contained; ns; ns = ns->sibling)
2854 /* Skip namespaces from used modules. */
2855 if (ns->parent != parent)
2858 gfc_create_function_decl (ns);
2861 for (ns = parent->contained; ns; ns = ns->sibling)
2863 /* Skip namespaces from used modules. */
2864 if (ns->parent != parent)
2867 gfc_generate_function_code (ns);
2872 /* Drill down through expressions for the array specification bounds and
2873 character length calling generate_local_decl for all those variables
2874 that have not already been declared. */
2877 generate_local_decl (gfc_symbol *);
2880 generate_expr_decls (gfc_symbol *sym, gfc_expr *e)
2882 gfc_actual_arglist *arg;
2889 switch (e->expr_type)
2892 for (arg = e->value.function.actual; arg; arg = arg->next)
2893 generate_expr_decls (sym, arg->expr);
2896 /* If the variable is not the same as the dependent, 'sym', and
2897 it is not marked as being declared and it is in the same
2898 namespace as 'sym', add it to the local declarations. */
2900 if (sym == e->symtree->n.sym
2901 || e->symtree->n.sym->mark
2902 || e->symtree->n.sym->ns != sym->ns)
2905 generate_local_decl (e->symtree->n.sym);
2909 generate_expr_decls (sym, e->value.op.op1);
2910 generate_expr_decls (sym, e->value.op.op2);
2919 for (ref = e->ref; ref; ref = ref->next)
2924 for (i = 0; i < ref->u.ar.dimen; i++)
2926 generate_expr_decls (sym, ref->u.ar.start[i]);
2927 generate_expr_decls (sym, ref->u.ar.end[i]);
2928 generate_expr_decls (sym, ref->u.ar.stride[i]);
2933 generate_expr_decls (sym, ref->u.ss.start);
2934 generate_expr_decls (sym, ref->u.ss.end);
2938 if (ref->u.c.component->ts.type == BT_CHARACTER
2939 && ref->u.c.component->ts.cl->length->expr_type
2941 generate_expr_decls (sym, ref->u.c.component->ts.cl->length);
2943 if (ref->u.c.component->as)
2944 for (i = 0; i < ref->u.c.component->as->rank; i++)
2946 generate_expr_decls (sym, ref->u.c.component->as->lower[i]);
2947 generate_expr_decls (sym, ref->u.c.component->as->upper[i]);
2956 /* Check for dependencies in the character length and array spec. */
2959 generate_dependency_declarations (gfc_symbol *sym)
2963 if (sym->ts.type == BT_CHARACTER
2964 && sym->ts.cl->length->expr_type != EXPR_CONSTANT)
2965 generate_expr_decls (sym, sym->ts.cl->length);
2967 if (sym->as && sym->as->rank)
2969 for (i = 0; i < sym->as->rank; i++)
2971 generate_expr_decls (sym, sym->as->lower[i]);
2972 generate_expr_decls (sym, sym->as->upper[i]);
2978 /* Generate decls for all local variables. We do this to ensure correct
2979 handling of expressions which only appear in the specification of
2983 generate_local_decl (gfc_symbol * sym)
2985 if (sym->attr.flavor == FL_VARIABLE)
2987 /* Check for dependencies in the array specification and string
2988 length, adding the necessary declarations to the function. We
2989 mark the symbol now, as well as in traverse_ns, to prevent
2990 getting stuck in a circular dependency. */
2992 if (!sym->attr.dummy && !sym->ns->proc_name->attr.entry_master)
2993 generate_dependency_declarations (sym);
2995 if (sym->attr.referenced)
2996 gfc_get_symbol_decl (sym);
2997 /* INTENT(out) dummy arguments are likely meant to be set. */
2998 else if (warn_unused_variable
3000 && sym->attr.intent == INTENT_OUT)
3001 gfc_warning ("dummy argument '%s' at %L was declared INTENT(OUT) but was not set",
3002 sym->name, &sym->declared_at);
3003 /* Specific warning for unused dummy arguments. */
3004 else if (warn_unused_variable && sym->attr.dummy)
3005 gfc_warning ("unused dummy argument '%s' at %L", sym->name,
3007 /* Warn for unused variables, but not if they're inside a common
3008 block or are use-associated. */
3009 else if (warn_unused_variable
3010 && !(sym->attr.in_common || sym->attr.use_assoc))
3011 gfc_warning ("unused variable '%s' declared at %L", sym->name,
3013 /* For variable length CHARACTER parameters, the PARM_DECL already
3014 references the length variable, so force gfc_get_symbol_decl
3015 even when not referenced. If optimize > 0, it will be optimized
3016 away anyway. But do this only after emitting -Wunused-parameter
3017 warning if requested. */
3018 if (sym->attr.dummy && ! sym->attr.referenced
3019 && sym->ts.type == BT_CHARACTER
3020 && sym->ts.cl->backend_decl != NULL
3021 && TREE_CODE (sym->ts.cl->backend_decl) == VAR_DECL)
3023 sym->attr.referenced = 1;
3024 gfc_get_symbol_decl (sym);
3027 /* We do not want the middle-end to warn about unused parameters
3028 as this was already done above. */
3029 if (sym->attr.dummy && sym->backend_decl != NULL_TREE)
3030 TREE_NO_WARNING(sym->backend_decl) = 1;
3032 else if (sym->attr.flavor == FL_PARAMETER)
3034 if (warn_unused_variable
3035 && !sym->attr.referenced
3036 && !sym->attr.use_assoc)
3037 gfc_warning ("unused parameter '%s' declared at %L", sym->name,
3041 if (sym->attr.dummy == 1)
3043 /* Modify the tree type for scalar character dummy arguments of bind(c)
3044 procedures if they are passed by value. The tree type for them will
3045 be promoted to INTEGER_TYPE for the middle end, which appears to be
3046 what C would do with characters passed by-value. The value attribute
3047 implies the dummy is a scalar. */
3048 if (sym->attr.value == 1 && sym->backend_decl != NULL
3049 && sym->ts.type == BT_CHARACTER && sym->ts.is_c_interop
3050 && sym->ns->proc_name != NULL && sym->ns->proc_name->attr.is_bind_c)
3051 TREE_TYPE (sym->backend_decl) = unsigned_char_type_node;
3054 /* Make sure we convert the types of the derived types from iso_c_binding
3056 if (sym->attr.flavor != FL_PROCEDURE && sym->attr.is_iso_c
3057 && sym->ts.type == BT_DERIVED)
3058 sym->backend_decl = gfc_typenode_for_spec (&(sym->ts));
3062 generate_local_vars (gfc_namespace * ns)
3064 gfc_traverse_ns (ns, generate_local_decl);
3068 /* Generate a switch statement to jump to the correct entry point. Also
3069 creates the label decls for the entry points. */
3072 gfc_trans_entry_master_switch (gfc_entry_list * el)
3079 gfc_init_block (&block);
3080 for (; el; el = el->next)
3082 /* Add the case label. */
3083 label = gfc_build_label_decl (NULL_TREE);
3084 val = build_int_cst (gfc_array_index_type, el->id);
3085 tmp = build3_v (CASE_LABEL_EXPR, val, NULL_TREE, label);
3086 gfc_add_expr_to_block (&block, tmp);
3088 /* And jump to the actual entry point. */
3089 label = gfc_build_label_decl (NULL_TREE);
3090 tmp = build1_v (GOTO_EXPR, label);
3091 gfc_add_expr_to_block (&block, tmp);
3093 /* Save the label decl. */
3096 tmp = gfc_finish_block (&block);
3097 /* The first argument selects the entry point. */
3098 val = DECL_ARGUMENTS (current_function_decl);
3099 tmp = build3_v (SWITCH_EXPR, val, tmp, NULL_TREE);
3104 /* Generate code for a function. */
3107 gfc_generate_function_code (gfc_namespace * ns)
3120 sym = ns->proc_name;
3122 /* Check that the frontend isn't still using this. */
3123 gcc_assert (sym->tlink == NULL);
3126 /* Create the declaration for functions with global scope. */
3127 if (!sym->backend_decl)
3128 gfc_create_function_decl (ns);
3130 fndecl = sym->backend_decl;
3131 old_context = current_function_decl;
3135 push_function_context ();
3136 saved_parent_function_decls = saved_function_decls;
3137 saved_function_decls = NULL_TREE;
3140 trans_function_start (sym);
3142 gfc_start_block (&block);
3144 if (ns->entries && ns->proc_name->ts.type == BT_CHARACTER)
3146 /* Copy length backend_decls to all entry point result
3151 gfc_conv_const_charlen (ns->proc_name->ts.cl);
3152 backend_decl = ns->proc_name->result->ts.cl->backend_decl;
3153 for (el = ns->entries; el; el = el->next)
3154 el->sym->result->ts.cl->backend_decl = backend_decl;
3157 /* Translate COMMON blocks. */
3158 gfc_trans_common (ns);
3160 /* Null the parent fake result declaration if this namespace is
3161 a module function or an external procedures. */
3162 if ((ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
3163 || ns->parent == NULL)
3164 parent_fake_result_decl = NULL_TREE;
3166 gfc_generate_contained_functions (ns);
3168 generate_local_vars (ns);
3170 /* Keep the parent fake result declaration in module functions
3171 or external procedures. */
3172 if ((ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
3173 || ns->parent == NULL)
3174 current_fake_result_decl = parent_fake_result_decl;
3176 current_fake_result_decl = NULL_TREE;
3178 current_function_return_label = NULL;
3180 /* Now generate the code for the body of this function. */
3181 gfc_init_block (&body);
3183 /* If this is the main program, add a call to set_options to set up the
3184 runtime library Fortran language standard parameters. */
3185 if (sym->attr.is_main_program)
3187 tree array_type, array, var;
3189 /* Passing a new option to the library requires four modifications:
3190 + add it to the tree_cons list below
3191 + change the array size in the call to build_array_type
3192 + change the first argument to the library call
3193 gfor_fndecl_set_options
3194 + modify the library (runtime/compile_options.c)! */
3195 array = tree_cons (NULL_TREE,
3196 build_int_cst (integer_type_node,
3197 gfc_option.warn_std), NULL_TREE);
3198 array = tree_cons (NULL_TREE,
3199 build_int_cst (integer_type_node,
3200 gfc_option.allow_std), array);
3201 array = tree_cons (NULL_TREE,
3202 build_int_cst (integer_type_node, pedantic), array);
3203 array = tree_cons (NULL_TREE,
3204 build_int_cst (integer_type_node,
3205 gfc_option.flag_dump_core), array);
3206 array = tree_cons (NULL_TREE,
3207 build_int_cst (integer_type_node,
3208 gfc_option.flag_backtrace), array);
3209 array = tree_cons (NULL_TREE,
3210 build_int_cst (integer_type_node,
3211 gfc_option.flag_sign_zero), array);
3213 array = tree_cons (NULL_TREE,
3214 build_int_cst (integer_type_node,
3215 flag_bounds_check), array);
3217 array_type = build_array_type (integer_type_node,
3218 build_index_type (build_int_cst (NULL_TREE,
3220 array = build_constructor_from_list (array_type, nreverse (array));
3221 TREE_CONSTANT (array) = 1;
3222 TREE_INVARIANT (array) = 1;
3223 TREE_STATIC (array) = 1;
3225 /* Create a static variable to hold the jump table. */
3226 var = gfc_create_var (array_type, "options");
3227 TREE_CONSTANT (var) = 1;
3228 TREE_INVARIANT (var) = 1;
3229 TREE_STATIC (var) = 1;
3230 TREE_READONLY (var) = 1;
3231 DECL_INITIAL (var) = array;
3232 var = gfc_build_addr_expr (pvoid_type_node, var);
3234 tmp = build_call_expr (gfor_fndecl_set_options, 2,
3235 build_int_cst (integer_type_node, 7), var);
3236 gfc_add_expr_to_block (&body, tmp);
3239 /* If this is the main program and a -ffpe-trap option was provided,
3240 add a call to set_fpe so that the library will raise a FPE when
3242 if (sym->attr.is_main_program && gfc_option.fpe != 0)
3244 tmp = build_call_expr (gfor_fndecl_set_fpe, 1,
3245 build_int_cst (integer_type_node,
3247 gfc_add_expr_to_block (&body, tmp);
3250 /* If this is the main program and an -fconvert option was provided,
3251 add a call to set_convert. */
3253 if (sym->attr.is_main_program && gfc_option.convert != CONVERT_NATIVE)
3255 tmp = build_call_expr (gfor_fndecl_set_convert, 1,
3256 build_int_cst (integer_type_node,
3257 gfc_option.convert));
3258 gfc_add_expr_to_block (&body, tmp);
3261 /* If this is the main program and an -frecord-marker option was provided,
3262 add a call to set_record_marker. */
3264 if (sym->attr.is_main_program && gfc_option.record_marker != 0)
3266 tmp = build_call_expr (gfor_fndecl_set_record_marker, 1,
3267 build_int_cst (integer_type_node,
3268 gfc_option.record_marker));
3269 gfc_add_expr_to_block (&body, tmp);
3272 if (sym->attr.is_main_program && gfc_option.max_subrecord_length != 0)
3274 tmp = build_call_expr (gfor_fndecl_set_max_subrecord_length,
3276 build_int_cst (integer_type_node,
3277 gfc_option.max_subrecord_length));
3278 gfc_add_expr_to_block (&body, tmp);
3281 if (TREE_TYPE (DECL_RESULT (fndecl)) != void_type_node
3282 && sym->attr.subroutine)
3284 tree alternate_return;
3285 alternate_return = gfc_get_fake_result_decl (sym, 0);
3286 gfc_add_modify_expr (&body, alternate_return, integer_zero_node);
3291 /* Jump to the correct entry point. */
3292 tmp = gfc_trans_entry_master_switch (ns->entries);
3293 gfc_add_expr_to_block (&body, tmp);
3296 tmp = gfc_trans_code (ns->code);
3297 gfc_add_expr_to_block (&body, tmp);
3299 /* Add a return label if needed. */
3300 if (current_function_return_label)
3302 tmp = build1_v (LABEL_EXPR, current_function_return_label);
3303 gfc_add_expr_to_block (&body, tmp);
3306 tmp = gfc_finish_block (&body);
3307 /* Add code to create and cleanup arrays. */
3308 tmp = gfc_trans_deferred_vars (sym, tmp);
3310 if (TREE_TYPE (DECL_RESULT (fndecl)) != void_type_node)
3312 if (sym->attr.subroutine || sym == sym->result)
3314 if (current_fake_result_decl != NULL)
3315 result = TREE_VALUE (current_fake_result_decl);
3318 current_fake_result_decl = NULL_TREE;
3321 result = sym->result->backend_decl;
3323 if (result != NULL_TREE && sym->attr.function
3324 && sym->ts.type == BT_DERIVED
3325 && sym->ts.derived->attr.alloc_comp
3326 && !sym->attr.pointer)
3328 rank = sym->as ? sym->as->rank : 0;
3329 tmp2 = gfc_nullify_alloc_comp (sym->ts.derived, result, rank);
3330 gfc_add_expr_to_block (&block, tmp2);
3333 gfc_add_expr_to_block (&block, tmp);
3335 if (result == NULL_TREE)
3336 warning (0, "Function return value not set");
3339 /* Set the return value to the dummy result variable. The
3340 types may be different for scalar default REAL functions
3341 with -ff2c, therefore we have to convert. */
3342 tmp = convert (TREE_TYPE (DECL_RESULT (fndecl)), result);
3343 tmp = build2 (MODIFY_EXPR, TREE_TYPE (tmp),
3344 DECL_RESULT (fndecl), tmp);
3345 tmp = build1_v (RETURN_EXPR, tmp);
3346 gfc_add_expr_to_block (&block, tmp);
3350 gfc_add_expr_to_block (&block, tmp);
3353 /* Add all the decls we created during processing. */
3354 decl = saved_function_decls;
3359 next = TREE_CHAIN (decl);
3360 TREE_CHAIN (decl) = NULL_TREE;
3364 saved_function_decls = NULL_TREE;
3366 DECL_SAVED_TREE (fndecl) = gfc_finish_block (&block);
3368 /* Finish off this function and send it for code generation. */
3370 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
3372 /* Output the GENERIC tree. */
3373 dump_function (TDI_original, fndecl);
3375 /* Store the end of the function, so that we get good line number
3376 info for the epilogue. */
3377 cfun->function_end_locus = input_location;
3379 /* We're leaving the context of this function, so zap cfun.
3380 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
3381 tree_rest_of_compilation. */
3386 pop_function_context ();
3387 saved_function_decls = saved_parent_function_decls;
3389 current_function_decl = old_context;
3391 if (decl_function_context (fndecl))
3392 /* Register this function with cgraph just far enough to get it
3393 added to our parent's nested function list. */
3394 (void) cgraph_node (fndecl);
3397 gfc_gimplify_function (fndecl);
3398 cgraph_finalize_function (fndecl, false);
3403 gfc_generate_constructors (void)
3405 gcc_assert (gfc_static_ctors == NULL_TREE);
3413 if (gfc_static_ctors == NULL_TREE)
3416 fnname = get_file_function_name ("I");
3417 type = build_function_type (void_type_node,
3418 gfc_chainon_list (NULL_TREE, void_type_node));
3420 fndecl = build_decl (FUNCTION_DECL, fnname, type);
3421 TREE_PUBLIC (fndecl) = 1;
3423 decl = build_decl (RESULT_DECL, NULL_TREE, void_type_node);
3424 DECL_ARTIFICIAL (decl) = 1;
3425 DECL_IGNORED_P (decl) = 1;
3426 DECL_CONTEXT (decl) = fndecl;
3427 DECL_RESULT (fndecl) = decl;
3431 current_function_decl = fndecl;
3433 rest_of_decl_compilation (fndecl, 1, 0);
3435 make_decl_rtl (fndecl);
3437 init_function_start (fndecl);
3441 for (; gfc_static_ctors; gfc_static_ctors = TREE_CHAIN (gfc_static_ctors))
3443 tmp = build_call_expr (TREE_VALUE (gfc_static_ctors), 0);
3444 DECL_SAVED_TREE (fndecl) = build_stmt (EXPR_STMT, tmp);
3449 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
3451 free_after_parsing (cfun);
3452 free_after_compilation (cfun);
3454 tree_rest_of_compilation (fndecl);
3456 current_function_decl = NULL_TREE;
3460 /* Translates a BLOCK DATA program unit. This means emitting the
3461 commons contained therein plus their initializations. We also emit
3462 a globally visible symbol to make sure that each BLOCK DATA program
3463 unit remains unique. */
3466 gfc_generate_block_data (gfc_namespace * ns)
3471 /* Tell the backend the source location of the block data. */
3473 gfc_set_backend_locus (&ns->proc_name->declared_at);
3475 gfc_set_backend_locus (&gfc_current_locus);
3477 /* Process the DATA statements. */
3478 gfc_trans_common (ns);
3480 /* Create a global symbol with the mane of the block data. This is to
3481 generate linker errors if the same name is used twice. It is never
3484 id = gfc_sym_mangled_function_id (ns->proc_name);
3486 id = get_identifier ("__BLOCK_DATA__");
3488 decl = build_decl (VAR_DECL, id, gfc_array_index_type);
3489 TREE_PUBLIC (decl) = 1;
3490 TREE_STATIC (decl) = 1;
3493 rest_of_decl_compilation (decl, 1, 0);
3497 #include "gt-fortran-trans-decl.h"