1 /* Backend function setup
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software
4 Contributed by Paul Brook
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* trans-decl.c -- Handling of backend function and variable decls, etc */
26 #include "coretypes.h"
28 #include "tree-dump.h"
29 #include "tree-gimple.h"
40 #include "trans-types.h"
41 #include "trans-array.h"
42 #include "trans-const.h"
43 /* Only for gfc_trans_code. Shouldn't need to include this. */
44 #include "trans-stmt.h"
46 #define MAX_LABEL_VALUE 99999
49 /* Holds the result of the function if no result variable specified. */
51 static GTY(()) tree current_fake_result_decl;
52 static GTY(()) tree parent_fake_result_decl;
54 static GTY(()) tree current_function_return_label;
57 /* Holds the variable DECLs for the current function. */
59 static GTY(()) tree saved_function_decls;
60 static GTY(()) tree saved_parent_function_decls;
63 /* The namespace of the module we're currently generating. Only used while
64 outputting decls for module variables. Do not rely on this being set. */
66 static gfc_namespace *module_namespace;
69 /* List of static constructor functions. */
71 tree gfc_static_ctors;
74 /* Function declarations for builtin library functions. */
76 tree gfor_fndecl_pause_numeric;
77 tree gfor_fndecl_pause_string;
78 tree gfor_fndecl_stop_numeric;
79 tree gfor_fndecl_stop_string;
80 tree gfor_fndecl_select_string;
81 tree gfor_fndecl_runtime_error;
82 tree gfor_fndecl_runtime_error_at;
83 tree gfor_fndecl_os_error;
84 tree gfor_fndecl_generate_error;
85 tree gfor_fndecl_set_fpe;
86 tree gfor_fndecl_set_options;
87 tree gfor_fndecl_set_convert;
88 tree gfor_fndecl_set_record_marker;
89 tree gfor_fndecl_set_max_subrecord_length;
90 tree gfor_fndecl_ctime;
91 tree gfor_fndecl_fdate;
92 tree gfor_fndecl_ttynam;
93 tree gfor_fndecl_in_pack;
94 tree gfor_fndecl_in_unpack;
95 tree gfor_fndecl_associated;
98 /* Math functions. Many other math functions are handled in
101 gfc_powdecl_list gfor_fndecl_math_powi[4][3];
102 tree gfor_fndecl_math_cpowf;
103 tree gfor_fndecl_math_cpow;
104 tree gfor_fndecl_math_cpowl10;
105 tree gfor_fndecl_math_cpowl16;
106 tree gfor_fndecl_math_ishftc4;
107 tree gfor_fndecl_math_ishftc8;
108 tree gfor_fndecl_math_ishftc16;
109 tree gfor_fndecl_math_exponent4;
110 tree gfor_fndecl_math_exponent8;
111 tree gfor_fndecl_math_exponent10;
112 tree gfor_fndecl_math_exponent16;
115 /* String functions. */
117 tree gfor_fndecl_compare_string;
118 tree gfor_fndecl_concat_string;
119 tree gfor_fndecl_string_len_trim;
120 tree gfor_fndecl_string_index;
121 tree gfor_fndecl_string_scan;
122 tree gfor_fndecl_string_verify;
123 tree gfor_fndecl_string_trim;
124 tree gfor_fndecl_string_minmax;
125 tree gfor_fndecl_adjustl;
126 tree gfor_fndecl_adjustr;
129 /* Other misc. runtime library functions. */
131 tree gfor_fndecl_size0;
132 tree gfor_fndecl_size1;
133 tree gfor_fndecl_iargc;
135 /* Intrinsic functions implemented in FORTRAN. */
136 tree gfor_fndecl_si_kind;
137 tree gfor_fndecl_sr_kind;
139 /* BLAS gemm functions. */
140 tree gfor_fndecl_sgemm;
141 tree gfor_fndecl_dgemm;
142 tree gfor_fndecl_cgemm;
143 tree gfor_fndecl_zgemm;
147 gfc_add_decl_to_parent_function (tree decl)
150 DECL_CONTEXT (decl) = DECL_CONTEXT (current_function_decl);
151 DECL_NONLOCAL (decl) = 1;
152 TREE_CHAIN (decl) = saved_parent_function_decls;
153 saved_parent_function_decls = decl;
157 gfc_add_decl_to_function (tree decl)
160 TREE_USED (decl) = 1;
161 DECL_CONTEXT (decl) = current_function_decl;
162 TREE_CHAIN (decl) = saved_function_decls;
163 saved_function_decls = decl;
167 /* Build a backend label declaration. Set TREE_USED for named labels.
168 The context of the label is always the current_function_decl. All
169 labels are marked artificial. */
172 gfc_build_label_decl (tree label_id)
174 /* 2^32 temporaries should be enough. */
175 static unsigned int tmp_num = 1;
179 if (label_id == NULL_TREE)
181 /* Build an internal label name. */
182 ASM_FORMAT_PRIVATE_NAME (label_name, "L", tmp_num++);
183 label_id = get_identifier (label_name);
188 /* Build the LABEL_DECL node. Labels have no type. */
189 label_decl = build_decl (LABEL_DECL, label_id, void_type_node);
190 DECL_CONTEXT (label_decl) = current_function_decl;
191 DECL_MODE (label_decl) = VOIDmode;
193 /* We always define the label as used, even if the original source
194 file never references the label. We don't want all kinds of
195 spurious warnings for old-style Fortran code with too many
197 TREE_USED (label_decl) = 1;
199 DECL_ARTIFICIAL (label_decl) = 1;
204 /* Returns the return label for the current function. */
207 gfc_get_return_label (void)
209 char name[GFC_MAX_SYMBOL_LEN + 10];
211 if (current_function_return_label)
212 return current_function_return_label;
214 sprintf (name, "__return_%s",
215 IDENTIFIER_POINTER (DECL_NAME (current_function_decl)));
217 current_function_return_label =
218 gfc_build_label_decl (get_identifier (name));
220 DECL_ARTIFICIAL (current_function_return_label) = 1;
222 return current_function_return_label;
226 /* Set the backend source location of a decl. */
229 gfc_set_decl_location (tree decl, locus * loc)
231 #ifdef USE_MAPPED_LOCATION
232 DECL_SOURCE_LOCATION (decl) = loc->lb->location;
234 DECL_SOURCE_LINE (decl) = loc->lb->linenum;
235 DECL_SOURCE_FILE (decl) = loc->lb->file->filename;
240 /* Return the backend label declaration for a given label structure,
241 or create it if it doesn't exist yet. */
244 gfc_get_label_decl (gfc_st_label * lp)
246 if (lp->backend_decl)
247 return lp->backend_decl;
250 char label_name[GFC_MAX_SYMBOL_LEN + 1];
253 /* Validate the label declaration from the front end. */
254 gcc_assert (lp != NULL && lp->value <= MAX_LABEL_VALUE);
256 /* Build a mangled name for the label. */
257 sprintf (label_name, "__label_%.6d", lp->value);
259 /* Build the LABEL_DECL node. */
260 label_decl = gfc_build_label_decl (get_identifier (label_name));
262 /* Tell the debugger where the label came from. */
263 if (lp->value <= MAX_LABEL_VALUE) /* An internal label. */
264 gfc_set_decl_location (label_decl, &lp->where);
266 DECL_ARTIFICIAL (label_decl) = 1;
268 /* Store the label in the label list and return the LABEL_DECL. */
269 lp->backend_decl = label_decl;
275 /* Convert a gfc_symbol to an identifier of the same name. */
278 gfc_sym_identifier (gfc_symbol * sym)
280 return (get_identifier (sym->name));
284 /* Construct mangled name from symbol name. */
287 gfc_sym_mangled_identifier (gfc_symbol * sym)
289 char name[GFC_MAX_MANGLED_SYMBOL_LEN + 1];
291 /* Prevent the mangling of identifiers that have an assigned
292 binding label (mainly those that are bind(c)). */
293 if (sym->attr.is_bind_c == 1
294 && sym->binding_label[0] != '\0')
295 return get_identifier(sym->binding_label);
297 if (sym->module == NULL)
298 return gfc_sym_identifier (sym);
301 snprintf (name, sizeof name, "__%s_MOD_%s", sym->module, sym->name);
302 return get_identifier (name);
307 /* Construct mangled function name from symbol name. */
310 gfc_sym_mangled_function_id (gfc_symbol * sym)
313 char name[GFC_MAX_MANGLED_SYMBOL_LEN + 1];
315 /* It may be possible to simply use the binding label if it's
316 provided, and remove the other checks. Then we could use it
317 for other things if we wished. */
318 if ((sym->attr.is_bind_c == 1 || sym->attr.is_iso_c == 1) &&
319 sym->binding_label[0] != '\0')
320 /* use the binding label rather than the mangled name */
321 return get_identifier (sym->binding_label);
323 if (sym->module == NULL || sym->attr.proc == PROC_EXTERNAL
324 || (sym->module != NULL && (sym->attr.external
325 || sym->attr.if_source == IFSRC_IFBODY)))
327 if (strcmp (sym->name, "MAIN__") == 0
328 || sym->attr.proc == PROC_INTRINSIC)
329 return get_identifier (sym->name);
331 if (gfc_option.flag_underscoring)
333 has_underscore = strchr (sym->name, '_') != 0;
334 if (gfc_option.flag_second_underscore && has_underscore)
335 snprintf (name, sizeof name, "%s__", sym->name);
337 snprintf (name, sizeof name, "%s_", sym->name);
338 return get_identifier (name);
341 return get_identifier (sym->name);
345 snprintf (name, sizeof name, "__%s_MOD_%s", sym->module, sym->name);
346 return get_identifier (name);
351 /* Returns true if a variable of specified size should go on the stack. */
354 gfc_can_put_var_on_stack (tree size)
356 unsigned HOST_WIDE_INT low;
358 if (!INTEGER_CST_P (size))
361 if (gfc_option.flag_max_stack_var_size < 0)
364 if (TREE_INT_CST_HIGH (size) != 0)
367 low = TREE_INT_CST_LOW (size);
368 if (low > (unsigned HOST_WIDE_INT) gfc_option.flag_max_stack_var_size)
371 /* TODO: Set a per-function stack size limit. */
377 /* gfc_finish_cray_pointee sets DECL_VALUE_EXPR for a Cray pointee to
378 an expression involving its corresponding pointer. There are
379 2 cases; one for variable size arrays, and one for everything else,
380 because variable-sized arrays require one fewer level of
384 gfc_finish_cray_pointee (tree decl, gfc_symbol *sym)
386 tree ptr_decl = gfc_get_symbol_decl (sym->cp_pointer);
389 /* Parameters need to be dereferenced. */
390 if (sym->cp_pointer->attr.dummy)
391 ptr_decl = build_fold_indirect_ref (ptr_decl);
393 /* Check to see if we're dealing with a variable-sized array. */
394 if (sym->attr.dimension
395 && TREE_CODE (TREE_TYPE (decl)) == POINTER_TYPE)
397 /* These decls will be dereferenced later, so we don't dereference
399 value = convert (TREE_TYPE (decl), ptr_decl);
403 ptr_decl = convert (build_pointer_type (TREE_TYPE (decl)),
405 value = build_fold_indirect_ref (ptr_decl);
408 SET_DECL_VALUE_EXPR (decl, value);
409 DECL_HAS_VALUE_EXPR_P (decl) = 1;
410 GFC_DECL_CRAY_POINTEE (decl) = 1;
411 /* This is a fake variable just for debugging purposes. */
412 TREE_ASM_WRITTEN (decl) = 1;
416 /* Finish processing of a declaration without an initial value. */
419 gfc_finish_decl (tree decl)
421 gcc_assert (TREE_CODE (decl) == PARM_DECL
422 || DECL_INITIAL (decl) == NULL_TREE);
424 if (TREE_CODE (decl) != VAR_DECL)
427 if (DECL_SIZE (decl) == NULL_TREE
428 && TYPE_SIZE (TREE_TYPE (decl)) != NULL_TREE)
429 layout_decl (decl, 0);
431 /* A few consistency checks. */
432 /* A static variable with an incomplete type is an error if it is
433 initialized. Also if it is not file scope. Otherwise, let it
434 through, but if it is not `extern' then it may cause an error
436 /* An automatic variable with an incomplete type is an error. */
438 /* We should know the storage size. */
439 gcc_assert (DECL_SIZE (decl) != NULL_TREE
440 || (TREE_STATIC (decl)
441 ? (!DECL_INITIAL (decl) || !DECL_CONTEXT (decl))
442 : DECL_EXTERNAL (decl)));
444 /* The storage size should be constant. */
445 gcc_assert ((!DECL_EXTERNAL (decl) && !TREE_STATIC (decl))
447 || TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST);
451 /* Apply symbol attributes to a variable, and add it to the function scope. */
454 gfc_finish_var_decl (tree decl, gfc_symbol * sym)
457 /* TREE_ADDRESSABLE means the address of this variable is actually needed.
458 This is the equivalent of the TARGET variables.
459 We also need to set this if the variable is passed by reference in a
462 /* Set DECL_VALUE_EXPR for Cray Pointees. */
463 if (sym->attr.cray_pointee)
464 gfc_finish_cray_pointee (decl, sym);
466 if (sym->attr.target)
467 TREE_ADDRESSABLE (decl) = 1;
468 /* If it wasn't used we wouldn't be getting it. */
469 TREE_USED (decl) = 1;
471 /* Chain this decl to the pending declarations. Don't do pushdecl()
472 because this would add them to the current scope rather than the
474 if (current_function_decl != NULL_TREE)
476 if (sym->ns->proc_name->backend_decl == current_function_decl
477 || sym->result == sym)
478 gfc_add_decl_to_function (decl);
480 gfc_add_decl_to_parent_function (decl);
483 if (sym->attr.cray_pointee)
486 if(sym->attr.is_bind_c == 1)
488 /* We need to put variables that are bind(c) into the common
489 segment of the object file, because this is what C would do.
490 gfortran would typically put them in either the BSS or
491 initialized data segments, and only mark them as common if
492 they were part of common blocks. However, if they are not put
493 into common space, then C cannot initialize global fortran
494 variables that it interoperates with and the draft says that
495 either Fortran or C should be able to initialize it (but not
496 both, of course.) (J3/04-007, section 15.3). */
497 TREE_PUBLIC(decl) = 1;
498 DECL_COMMON(decl) = 1;
501 /* If a variable is USE associated, it's always external. */
502 if (sym->attr.use_assoc)
504 DECL_EXTERNAL (decl) = 1;
505 TREE_PUBLIC (decl) = 1;
507 else if (sym->module && !sym->attr.result && !sym->attr.dummy)
509 /* TODO: Don't set sym->module for result or dummy variables. */
510 gcc_assert (current_function_decl == NULL_TREE || sym->result == sym);
511 /* This is the declaration of a module variable. */
512 TREE_PUBLIC (decl) = 1;
513 TREE_STATIC (decl) = 1;
516 if ((sym->attr.save || sym->attr.data || sym->value)
517 && !sym->attr.use_assoc)
518 TREE_STATIC (decl) = 1;
520 if (sym->attr.volatile_)
522 TREE_THIS_VOLATILE (decl) = 1;
523 new = build_qualified_type (TREE_TYPE (decl), TYPE_QUAL_VOLATILE);
524 TREE_TYPE (decl) = new;
527 /* Keep variables larger than max-stack-var-size off stack. */
528 if (!sym->ns->proc_name->attr.recursive
529 && INTEGER_CST_P (DECL_SIZE_UNIT (decl))
530 && !gfc_can_put_var_on_stack (DECL_SIZE_UNIT (decl))
531 /* Put variable length auto array pointers always into stack. */
532 && (TREE_CODE (TREE_TYPE (decl)) != POINTER_TYPE
533 || sym->attr.dimension == 0
534 || sym->as->type != AS_EXPLICIT
536 || sym->attr.allocatable)
537 && !DECL_ARTIFICIAL (decl))
538 TREE_STATIC (decl) = 1;
540 /* Handle threadprivate variables. */
541 if (sym->attr.threadprivate
542 && (TREE_STATIC (decl) || DECL_EXTERNAL (decl)))
543 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
547 /* Allocate the lang-specific part of a decl. */
550 gfc_allocate_lang_decl (tree decl)
552 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
553 ggc_alloc_cleared (sizeof (struct lang_decl));
556 /* Remember a symbol to generate initialization/cleanup code at function
560 gfc_defer_symbol_init (gfc_symbol * sym)
566 /* Don't add a symbol twice. */
570 last = head = sym->ns->proc_name;
573 /* Make sure that setup code for dummy variables which are used in the
574 setup of other variables is generated first. */
577 /* Find the first dummy arg seen after us, or the first non-dummy arg.
578 This is a circular list, so don't go past the head. */
580 && (!p->attr.dummy || p->dummy_order > sym->dummy_order))
586 /* Insert in between last and p. */
592 /* Create an array index type variable with function scope. */
595 create_index_var (const char * pfx, int nest)
599 decl = gfc_create_var_np (gfc_array_index_type, pfx);
601 gfc_add_decl_to_parent_function (decl);
603 gfc_add_decl_to_function (decl);
608 /* Create variables to hold all the non-constant bits of info for a
609 descriptorless array. Remember these in the lang-specific part of the
613 gfc_build_qualified_array (tree decl, gfc_symbol * sym)
619 type = TREE_TYPE (decl);
621 /* We just use the descriptor, if there is one. */
622 if (GFC_DESCRIPTOR_TYPE_P (type))
625 gcc_assert (GFC_ARRAY_TYPE_P (type));
626 nest = (sym->ns->proc_name->backend_decl != current_function_decl)
627 && !sym->attr.contained;
629 for (dim = 0; dim < GFC_TYPE_ARRAY_RANK (type); dim++)
631 if (GFC_TYPE_ARRAY_LBOUND (type, dim) == NULL_TREE)
633 GFC_TYPE_ARRAY_LBOUND (type, dim) = create_index_var ("lbound", nest);
634 TREE_NO_WARNING (GFC_TYPE_ARRAY_LBOUND (type, dim)) = 1;
636 /* Don't try to use the unknown bound for assumed shape arrays. */
637 if (GFC_TYPE_ARRAY_UBOUND (type, dim) == NULL_TREE
638 && (sym->as->type != AS_ASSUMED_SIZE
639 || dim < GFC_TYPE_ARRAY_RANK (type) - 1))
641 GFC_TYPE_ARRAY_UBOUND (type, dim) = create_index_var ("ubound", nest);
642 TREE_NO_WARNING (GFC_TYPE_ARRAY_UBOUND (type, dim)) = 1;
645 if (GFC_TYPE_ARRAY_STRIDE (type, dim) == NULL_TREE)
647 GFC_TYPE_ARRAY_STRIDE (type, dim) = create_index_var ("stride", nest);
648 TREE_NO_WARNING (GFC_TYPE_ARRAY_STRIDE (type, dim)) = 1;
651 if (GFC_TYPE_ARRAY_OFFSET (type) == NULL_TREE)
653 GFC_TYPE_ARRAY_OFFSET (type) = gfc_create_var_np (gfc_array_index_type,
655 TREE_NO_WARNING (GFC_TYPE_ARRAY_OFFSET (type)) = 1;
658 gfc_add_decl_to_parent_function (GFC_TYPE_ARRAY_OFFSET (type));
660 gfc_add_decl_to_function (GFC_TYPE_ARRAY_OFFSET (type));
663 if (GFC_TYPE_ARRAY_SIZE (type) == NULL_TREE
664 && sym->as->type != AS_ASSUMED_SIZE)
666 GFC_TYPE_ARRAY_SIZE (type) = create_index_var ("size", nest);
667 TREE_NO_WARNING (GFC_TYPE_ARRAY_SIZE (type)) = 1;
670 if (POINTER_TYPE_P (type))
672 gcc_assert (GFC_ARRAY_TYPE_P (TREE_TYPE (type)));
673 gcc_assert (TYPE_LANG_SPECIFIC (type)
674 == TYPE_LANG_SPECIFIC (TREE_TYPE (type)));
675 type = TREE_TYPE (type);
678 if (! COMPLETE_TYPE_P (type) && GFC_TYPE_ARRAY_SIZE (type))
682 size = build2 (MINUS_EXPR, gfc_array_index_type,
683 GFC_TYPE_ARRAY_SIZE (type), gfc_index_one_node);
684 range = build_range_type (gfc_array_index_type, gfc_index_zero_node,
686 TYPE_DOMAIN (type) = range;
692 /* For some dummy arguments we don't use the actual argument directly.
693 Instead we create a local decl and use that. This allows us to perform
694 initialization, and construct full type information. */
697 gfc_build_dummy_array_decl (gfc_symbol * sym, tree dummy)
707 if (sym->attr.pointer || sym->attr.allocatable)
710 /* Add to list of variables if not a fake result variable. */
711 if (sym->attr.result || sym->attr.dummy)
712 gfc_defer_symbol_init (sym);
714 type = TREE_TYPE (dummy);
715 gcc_assert (TREE_CODE (dummy) == PARM_DECL
716 && POINTER_TYPE_P (type));
718 /* Do we know the element size? */
719 known_size = sym->ts.type != BT_CHARACTER
720 || INTEGER_CST_P (sym->ts.cl->backend_decl);
722 if (known_size && !GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (type)))
724 /* For descriptorless arrays with known element size the actual
725 argument is sufficient. */
726 gcc_assert (GFC_ARRAY_TYPE_P (type));
727 gfc_build_qualified_array (dummy, sym);
731 type = TREE_TYPE (type);
732 if (GFC_DESCRIPTOR_TYPE_P (type))
734 /* Create a descriptorless array pointer. */
737 if (!gfc_option.flag_repack_arrays)
739 if (as->type == AS_ASSUMED_SIZE)
740 packed = PACKED_FULL;
744 if (as->type == AS_EXPLICIT)
746 packed = PACKED_FULL;
747 for (n = 0; n < as->rank; n++)
751 && as->upper[n]->expr_type == EXPR_CONSTANT
752 && as->lower[n]->expr_type == EXPR_CONSTANT))
753 packed = PACKED_PARTIAL;
757 packed = PACKED_PARTIAL;
760 type = gfc_typenode_for_spec (&sym->ts);
761 type = gfc_get_nodesc_array_type (type, sym->as, packed);
765 /* We now have an expression for the element size, so create a fully
766 qualified type. Reset sym->backend decl or this will just return the
768 DECL_ARTIFICIAL (sym->backend_decl) = 1;
769 sym->backend_decl = NULL_TREE;
770 type = gfc_sym_type (sym);
771 packed = PACKED_FULL;
774 ASM_FORMAT_PRIVATE_NAME (name, IDENTIFIER_POINTER (DECL_NAME (dummy)), 0);
775 decl = build_decl (VAR_DECL, get_identifier (name), type);
777 DECL_ARTIFICIAL (decl) = 1;
778 TREE_PUBLIC (decl) = 0;
779 TREE_STATIC (decl) = 0;
780 DECL_EXTERNAL (decl) = 0;
782 /* We should never get deferred shape arrays here. We used to because of
784 gcc_assert (sym->as->type != AS_DEFERRED);
786 if (packed == PACKED_PARTIAL)
787 GFC_DECL_PARTIAL_PACKED_ARRAY (decl) = 1;
788 else if (packed == PACKED_FULL)
789 GFC_DECL_PACKED_ARRAY (decl) = 1;
791 gfc_build_qualified_array (decl, sym);
793 if (DECL_LANG_SPECIFIC (dummy))
794 DECL_LANG_SPECIFIC (decl) = DECL_LANG_SPECIFIC (dummy);
796 gfc_allocate_lang_decl (decl);
798 GFC_DECL_SAVED_DESCRIPTOR (decl) = dummy;
800 if (sym->ns->proc_name->backend_decl == current_function_decl
801 || sym->attr.contained)
802 gfc_add_decl_to_function (decl);
804 gfc_add_decl_to_parent_function (decl);
810 /* Return a constant or a variable to use as a string length. Does not
811 add the decl to the current scope. */
814 gfc_create_string_length (gfc_symbol * sym)
818 gcc_assert (sym->ts.cl);
819 gfc_conv_const_charlen (sym->ts.cl);
821 if (sym->ts.cl->backend_decl == NULL_TREE)
823 char name[GFC_MAX_MANGLED_SYMBOL_LEN + 2];
825 /* Also prefix the mangled name. */
826 strcpy (&name[1], sym->name);
828 length = build_decl (VAR_DECL, get_identifier (name),
829 gfc_charlen_type_node);
830 DECL_ARTIFICIAL (length) = 1;
831 TREE_USED (length) = 1;
832 if (sym->ns->proc_name->tlink != NULL)
833 gfc_defer_symbol_init (sym);
834 sym->ts.cl->backend_decl = length;
837 return sym->ts.cl->backend_decl;
840 /* If a variable is assigned a label, we add another two auxiliary
844 gfc_add_assign_aux_vars (gfc_symbol * sym)
850 gcc_assert (sym->backend_decl);
852 decl = sym->backend_decl;
853 gfc_allocate_lang_decl (decl);
854 GFC_DECL_ASSIGN (decl) = 1;
855 length = build_decl (VAR_DECL, create_tmp_var_name (sym->name),
856 gfc_charlen_type_node);
857 addr = build_decl (VAR_DECL, create_tmp_var_name (sym->name),
859 gfc_finish_var_decl (length, sym);
860 gfc_finish_var_decl (addr, sym);
861 /* STRING_LENGTH is also used as flag. Less than -1 means that
862 ASSIGN_ADDR can not be used. Equal -1 means that ASSIGN_ADDR is the
863 target label's address. Otherwise, value is the length of a format string
864 and ASSIGN_ADDR is its address. */
865 if (TREE_STATIC (length))
866 DECL_INITIAL (length) = build_int_cst (NULL_TREE, -2);
868 gfc_defer_symbol_init (sym);
870 GFC_DECL_STRING_LEN (decl) = length;
871 GFC_DECL_ASSIGN_ADDR (decl) = addr;
874 /* Return the decl for a gfc_symbol, create it if it doesn't already
878 gfc_get_symbol_decl (gfc_symbol * sym)
881 tree length = NULL_TREE;
884 gcc_assert (sym->attr.referenced
885 || sym->attr.use_assoc
886 || sym->ns->proc_name->attr.if_source == IFSRC_IFBODY);
888 if (sym->ns && sym->ns->proc_name->attr.function)
889 byref = gfc_return_by_reference (sym->ns->proc_name);
893 if ((sym->attr.dummy && ! sym->attr.function) || (sym->attr.result && byref))
895 /* Return via extra parameter. */
896 if (sym->attr.result && byref
897 && !sym->backend_decl)
900 DECL_ARGUMENTS (sym->ns->proc_name->backend_decl);
901 /* For entry master function skip over the __entry
903 if (sym->ns->proc_name->attr.entry_master)
904 sym->backend_decl = TREE_CHAIN (sym->backend_decl);
907 /* Dummy variables should already have been created. */
908 gcc_assert (sym->backend_decl);
910 /* Create a character length variable. */
911 if (sym->ts.type == BT_CHARACTER)
913 if (sym->ts.cl->backend_decl == NULL_TREE)
914 length = gfc_create_string_length (sym);
916 length = sym->ts.cl->backend_decl;
917 if (TREE_CODE (length) == VAR_DECL
918 && DECL_CONTEXT (length) == NULL_TREE)
920 /* Add the string length to the same context as the symbol. */
921 if (DECL_CONTEXT (sym->backend_decl) == current_function_decl)
922 gfc_add_decl_to_function (length);
924 gfc_add_decl_to_parent_function (length);
926 gcc_assert (DECL_CONTEXT (sym->backend_decl) ==
927 DECL_CONTEXT (length));
929 gfc_defer_symbol_init (sym);
933 /* Use a copy of the descriptor for dummy arrays. */
934 if (sym->attr.dimension && !TREE_USED (sym->backend_decl))
936 decl = gfc_build_dummy_array_decl (sym, sym->backend_decl);
937 /* Prevent the dummy from being detected as unused if it is copied. */
938 if (sym->backend_decl != NULL && decl != sym->backend_decl)
939 DECL_ARTIFICIAL (sym->backend_decl) = 1;
940 sym->backend_decl = decl;
943 TREE_USED (sym->backend_decl) = 1;
944 if (sym->attr.assign && GFC_DECL_ASSIGN (sym->backend_decl) == 0)
946 gfc_add_assign_aux_vars (sym);
948 return sym->backend_decl;
951 if (sym->backend_decl)
952 return sym->backend_decl;
954 /* Catch function declarations. Only used for actual parameters. */
955 if (sym->attr.flavor == FL_PROCEDURE)
957 decl = gfc_get_extern_function_decl (sym);
961 if (sym->attr.intrinsic)
962 internal_error ("intrinsic variable which isn't a procedure");
964 /* Create string length decl first so that they can be used in the
966 if (sym->ts.type == BT_CHARACTER)
967 length = gfc_create_string_length (sym);
969 /* Create the decl for the variable. */
970 decl = build_decl (VAR_DECL, gfc_sym_identifier (sym), gfc_sym_type (sym));
972 gfc_set_decl_location (decl, &sym->declared_at);
974 /* Symbols from modules should have their assembler names mangled.
975 This is done here rather than in gfc_finish_var_decl because it
976 is different for string length variables. */
978 SET_DECL_ASSEMBLER_NAME (decl, gfc_sym_mangled_identifier (sym));
980 if (sym->attr.dimension)
982 /* Create variables to hold the non-constant bits of array info. */
983 gfc_build_qualified_array (decl, sym);
985 /* Remember this variable for allocation/cleanup. */
986 gfc_defer_symbol_init (sym);
988 if ((sym->attr.allocatable || !sym->attr.dummy) && !sym->attr.pointer)
989 GFC_DECL_PACKED_ARRAY (decl) = 1;
992 if (sym->ts.type == BT_DERIVED && sym->ts.derived->attr.alloc_comp)
993 gfc_defer_symbol_init (sym);
995 gfc_finish_var_decl (decl, sym);
997 if (sym->ts.type == BT_CHARACTER)
999 /* Character variables need special handling. */
1000 gfc_allocate_lang_decl (decl);
1002 if (TREE_CODE (length) != INTEGER_CST)
1004 char name[GFC_MAX_MANGLED_SYMBOL_LEN + 2];
1008 /* Also prefix the mangled name for symbols from modules. */
1009 strcpy (&name[1], sym->name);
1012 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (length)));
1013 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (name));
1015 gfc_finish_var_decl (length, sym);
1016 gcc_assert (!sym->value);
1019 else if (sym->attr.subref_array_pointer)
1021 /* We need the span for these beasts. */
1022 gfc_allocate_lang_decl (decl);
1025 if (sym->attr.subref_array_pointer)
1028 GFC_DECL_SUBREF_ARRAY_P (decl) = 1;
1029 span = build_decl (VAR_DECL, create_tmp_var_name ("span"),
1030 gfc_array_index_type);
1031 gfc_finish_var_decl (span, sym);
1032 TREE_STATIC (span) = 1;
1033 DECL_INITIAL (span) = build_int_cst (NULL_TREE, 0);
1035 GFC_DECL_SPAN (decl) = span;
1038 sym->backend_decl = decl;
1040 if (sym->attr.assign)
1041 gfc_add_assign_aux_vars (sym);
1043 if (TREE_STATIC (decl) && !sym->attr.use_assoc)
1045 /* Add static initializer. */
1046 DECL_INITIAL (decl) = gfc_conv_initializer (sym->value, &sym->ts,
1047 TREE_TYPE (decl), sym->attr.dimension,
1048 sym->attr.pointer || sym->attr.allocatable);
1055 /* Substitute a temporary variable in place of the real one. */
1058 gfc_shadow_sym (gfc_symbol * sym, tree decl, gfc_saved_var * save)
1060 save->attr = sym->attr;
1061 save->decl = sym->backend_decl;
1063 gfc_clear_attr (&sym->attr);
1064 sym->attr.referenced = 1;
1065 sym->attr.flavor = FL_VARIABLE;
1067 sym->backend_decl = decl;
1071 /* Restore the original variable. */
1074 gfc_restore_sym (gfc_symbol * sym, gfc_saved_var * save)
1076 sym->attr = save->attr;
1077 sym->backend_decl = save->decl;
1081 /* Get a basic decl for an external function. */
1084 gfc_get_extern_function_decl (gfc_symbol * sym)
1089 gfc_intrinsic_sym *isym;
1091 char s[GFC_MAX_SYMBOL_LEN + 23]; /* "_gfortran_f2c_specific" and '\0'. */
1095 if (sym->backend_decl)
1096 return sym->backend_decl;
1098 /* We should never be creating external decls for alternate entry points.
1099 The procedure may be an alternate entry point, but we don't want/need
1101 gcc_assert (!(sym->attr.entry || sym->attr.entry_master));
1103 if (sym->attr.intrinsic)
1105 /* Call the resolution function to get the actual name. This is
1106 a nasty hack which relies on the resolution functions only looking
1107 at the first argument. We pass NULL for the second argument
1108 otherwise things like AINT get confused. */
1109 isym = gfc_find_function (sym->name);
1110 gcc_assert (isym->resolve.f0 != NULL);
1112 memset (&e, 0, sizeof (e));
1113 e.expr_type = EXPR_FUNCTION;
1115 memset (&argexpr, 0, sizeof (argexpr));
1116 gcc_assert (isym->formal);
1117 argexpr.ts = isym->formal->ts;
1119 if (isym->formal->next == NULL)
1120 isym->resolve.f1 (&e, &argexpr);
1123 if (isym->formal->next->next == NULL)
1124 isym->resolve.f2 (&e, &argexpr, NULL);
1127 if (isym->formal->next->next->next == NULL)
1128 isym->resolve.f3 (&e, &argexpr, NULL, NULL);
1131 /* All specific intrinsics take less than 5 arguments. */
1132 gcc_assert (isym->formal->next->next->next->next == NULL);
1133 isym->resolve.f4 (&e, &argexpr, NULL, NULL, NULL);
1138 if (gfc_option.flag_f2c
1139 && ((e.ts.type == BT_REAL && e.ts.kind == gfc_default_real_kind)
1140 || e.ts.type == BT_COMPLEX))
1142 /* Specific which needs a different implementation if f2c
1143 calling conventions are used. */
1144 sprintf (s, "_gfortran_f2c_specific%s", e.value.function.name);
1147 sprintf (s, "_gfortran_specific%s", e.value.function.name);
1149 name = get_identifier (s);
1150 mangled_name = name;
1154 name = gfc_sym_identifier (sym);
1155 mangled_name = gfc_sym_mangled_function_id (sym);
1158 type = gfc_get_function_type (sym);
1159 fndecl = build_decl (FUNCTION_DECL, name, type);
1161 SET_DECL_ASSEMBLER_NAME (fndecl, mangled_name);
1162 /* If the return type is a pointer, avoid alias issues by setting
1163 DECL_IS_MALLOC to nonzero. This means that the function should be
1164 treated as if it were a malloc, meaning it returns a pointer that
1166 if (POINTER_TYPE_P (type))
1167 DECL_IS_MALLOC (fndecl) = 1;
1169 /* Set the context of this decl. */
1170 if (0 && sym->ns && sym->ns->proc_name)
1172 /* TODO: Add external decls to the appropriate scope. */
1173 DECL_CONTEXT (fndecl) = sym->ns->proc_name->backend_decl;
1177 /* Global declaration, e.g. intrinsic subroutine. */
1178 DECL_CONTEXT (fndecl) = NULL_TREE;
1181 DECL_EXTERNAL (fndecl) = 1;
1183 /* This specifies if a function is globally addressable, i.e. it is
1184 the opposite of declaring static in C. */
1185 TREE_PUBLIC (fndecl) = 1;
1187 /* Set attributes for PURE functions. A call to PURE function in the
1188 Fortran 95 sense is both pure and without side effects in the C
1190 if (sym->attr.pure || sym->attr.elemental)
1192 if (sym->attr.function && !gfc_return_by_reference (sym))
1193 DECL_IS_PURE (fndecl) = 1;
1194 /* TODO: check if pure SUBROUTINEs don't have INTENT(OUT)
1195 parameters and don't use alternate returns (is this
1196 allowed?). In that case, calls to them are meaningless, and
1197 can be optimized away. See also in build_function_decl(). */
1198 TREE_SIDE_EFFECTS (fndecl) = 0;
1201 /* Mark non-returning functions. */
1202 if (sym->attr.noreturn)
1203 TREE_THIS_VOLATILE(fndecl) = 1;
1205 sym->backend_decl = fndecl;
1207 if (DECL_CONTEXT (fndecl) == NULL_TREE)
1208 pushdecl_top_level (fndecl);
1214 /* Create a declaration for a procedure. For external functions (in the C
1215 sense) use gfc_get_extern_function_decl. HAS_ENTRIES is true if this is
1216 a master function with alternate entry points. */
1219 build_function_decl (gfc_symbol * sym)
1222 symbol_attribute attr;
1224 gfc_formal_arglist *f;
1226 gcc_assert (!sym->backend_decl);
1227 gcc_assert (!sym->attr.external);
1229 /* Set the line and filename. sym->declared_at seems to point to the
1230 last statement for subroutines, but it'll do for now. */
1231 gfc_set_backend_locus (&sym->declared_at);
1233 /* Allow only one nesting level. Allow public declarations. */
1234 gcc_assert (current_function_decl == NULL_TREE
1235 || DECL_CONTEXT (current_function_decl) == NULL_TREE);
1237 type = gfc_get_function_type (sym);
1238 fndecl = build_decl (FUNCTION_DECL, gfc_sym_identifier (sym), type);
1240 /* Perform name mangling if this is a top level or module procedure. */
1241 if (current_function_decl == NULL_TREE)
1242 SET_DECL_ASSEMBLER_NAME (fndecl, gfc_sym_mangled_function_id (sym));
1244 /* Figure out the return type of the declared function, and build a
1245 RESULT_DECL for it. If this is a subroutine with alternate
1246 returns, build a RESULT_DECL for it. */
1249 result_decl = NULL_TREE;
1250 /* TODO: Shouldn't this just be TREE_TYPE (TREE_TYPE (fndecl)). */
1253 if (gfc_return_by_reference (sym))
1254 type = void_type_node;
1257 if (sym->result != sym)
1258 result_decl = gfc_sym_identifier (sym->result);
1260 type = TREE_TYPE (TREE_TYPE (fndecl));
1265 /* Look for alternate return placeholders. */
1266 int has_alternate_returns = 0;
1267 for (f = sym->formal; f; f = f->next)
1271 has_alternate_returns = 1;
1276 if (has_alternate_returns)
1277 type = integer_type_node;
1279 type = void_type_node;
1282 result_decl = build_decl (RESULT_DECL, result_decl, type);
1283 DECL_ARTIFICIAL (result_decl) = 1;
1284 DECL_IGNORED_P (result_decl) = 1;
1285 DECL_CONTEXT (result_decl) = fndecl;
1286 DECL_RESULT (fndecl) = result_decl;
1288 /* Don't call layout_decl for a RESULT_DECL.
1289 layout_decl (result_decl, 0); */
1291 /* If the return type is a pointer, avoid alias issues by setting
1292 DECL_IS_MALLOC to nonzero. This means that the function should be
1293 treated as if it were a malloc, meaning it returns a pointer that
1295 if (POINTER_TYPE_P (type))
1296 DECL_IS_MALLOC (fndecl) = 1;
1298 /* Set up all attributes for the function. */
1299 DECL_CONTEXT (fndecl) = current_function_decl;
1300 DECL_EXTERNAL (fndecl) = 0;
1302 /* This specifies if a function is globally visible, i.e. it is
1303 the opposite of declaring static in C. */
1304 if (DECL_CONTEXT (fndecl) == NULL_TREE
1305 && !sym->attr.entry_master)
1306 TREE_PUBLIC (fndecl) = 1;
1308 /* TREE_STATIC means the function body is defined here. */
1309 TREE_STATIC (fndecl) = 1;
1311 /* Set attributes for PURE functions. A call to a PURE function in the
1312 Fortran 95 sense is both pure and without side effects in the C
1314 if (attr.pure || attr.elemental)
1316 /* TODO: check if a pure SUBROUTINE has no INTENT(OUT) arguments
1317 including an alternate return. In that case it can also be
1318 marked as PURE. See also in gfc_get_extern_function_decl(). */
1319 if (attr.function && !gfc_return_by_reference (sym))
1320 DECL_IS_PURE (fndecl) = 1;
1321 TREE_SIDE_EFFECTS (fndecl) = 0;
1324 /* For -fwhole-program to work well, MAIN__ needs to have the
1325 "externally_visible" attribute. */
1326 if (attr.is_main_program)
1327 DECL_ATTRIBUTES (fndecl)
1328 = tree_cons (get_identifier("externally_visible"), NULL_TREE, NULL_TREE);
1330 /* Layout the function declaration and put it in the binding level
1331 of the current function. */
1334 sym->backend_decl = fndecl;
1338 /* Create the DECL_ARGUMENTS for a procedure. */
1341 create_function_arglist (gfc_symbol * sym)
1344 gfc_formal_arglist *f;
1345 tree typelist, hidden_typelist;
1346 tree arglist, hidden_arglist;
1350 fndecl = sym->backend_decl;
1352 /* Build formal argument list. Make sure that their TREE_CONTEXT is
1353 the new FUNCTION_DECL node. */
1354 arglist = NULL_TREE;
1355 hidden_arglist = NULL_TREE;
1356 typelist = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
1358 if (sym->attr.entry_master)
1360 type = TREE_VALUE (typelist);
1361 parm = build_decl (PARM_DECL, get_identifier ("__entry"), type);
1363 DECL_CONTEXT (parm) = fndecl;
1364 DECL_ARG_TYPE (parm) = type;
1365 TREE_READONLY (parm) = 1;
1366 gfc_finish_decl (parm);
1367 DECL_ARTIFICIAL (parm) = 1;
1369 arglist = chainon (arglist, parm);
1370 typelist = TREE_CHAIN (typelist);
1373 if (gfc_return_by_reference (sym))
1375 tree type = TREE_VALUE (typelist), length = NULL;
1377 if (sym->ts.type == BT_CHARACTER)
1379 /* Length of character result. */
1380 tree len_type = TREE_VALUE (TREE_CHAIN (typelist));
1381 gcc_assert (len_type == gfc_charlen_type_node);
1383 length = build_decl (PARM_DECL,
1384 get_identifier (".__result"),
1386 if (!sym->ts.cl->length)
1388 sym->ts.cl->backend_decl = length;
1389 TREE_USED (length) = 1;
1391 gcc_assert (TREE_CODE (length) == PARM_DECL);
1392 DECL_CONTEXT (length) = fndecl;
1393 DECL_ARG_TYPE (length) = len_type;
1394 TREE_READONLY (length) = 1;
1395 DECL_ARTIFICIAL (length) = 1;
1396 gfc_finish_decl (length);
1397 if (sym->ts.cl->backend_decl == NULL
1398 || sym->ts.cl->backend_decl == length)
1403 if (sym->ts.cl->backend_decl == NULL)
1405 tree len = build_decl (VAR_DECL,
1406 get_identifier ("..__result"),
1407 gfc_charlen_type_node);
1408 DECL_ARTIFICIAL (len) = 1;
1409 TREE_USED (len) = 1;
1410 sym->ts.cl->backend_decl = len;
1413 /* Make sure PARM_DECL type doesn't point to incomplete type. */
1414 arg = sym->result ? sym->result : sym;
1415 backend_decl = arg->backend_decl;
1416 /* Temporary clear it, so that gfc_sym_type creates complete
1418 arg->backend_decl = NULL;
1419 type = gfc_sym_type (arg);
1420 arg->backend_decl = backend_decl;
1421 type = build_reference_type (type);
1425 parm = build_decl (PARM_DECL, get_identifier ("__result"), type);
1427 DECL_CONTEXT (parm) = fndecl;
1428 DECL_ARG_TYPE (parm) = TREE_VALUE (typelist);
1429 TREE_READONLY (parm) = 1;
1430 DECL_ARTIFICIAL (parm) = 1;
1431 gfc_finish_decl (parm);
1433 arglist = chainon (arglist, parm);
1434 typelist = TREE_CHAIN (typelist);
1436 if (sym->ts.type == BT_CHARACTER)
1438 gfc_allocate_lang_decl (parm);
1439 arglist = chainon (arglist, length);
1440 typelist = TREE_CHAIN (typelist);
1444 hidden_typelist = typelist;
1445 for (f = sym->formal; f; f = f->next)
1446 if (f->sym != NULL) /* Ignore alternate returns. */
1447 hidden_typelist = TREE_CHAIN (hidden_typelist);
1449 for (f = sym->formal; f; f = f->next)
1451 char name[GFC_MAX_SYMBOL_LEN + 2];
1453 /* Ignore alternate returns. */
1457 type = TREE_VALUE (typelist);
1459 if (f->sym->ts.type == BT_CHARACTER)
1461 tree len_type = TREE_VALUE (hidden_typelist);
1462 tree length = NULL_TREE;
1463 gcc_assert (len_type == gfc_charlen_type_node);
1465 strcpy (&name[1], f->sym->name);
1467 length = build_decl (PARM_DECL, get_identifier (name), len_type);
1469 hidden_arglist = chainon (hidden_arglist, length);
1470 DECL_CONTEXT (length) = fndecl;
1471 DECL_ARTIFICIAL (length) = 1;
1472 DECL_ARG_TYPE (length) = len_type;
1473 TREE_READONLY (length) = 1;
1474 gfc_finish_decl (length);
1476 /* TODO: Check string lengths when -fbounds-check. */
1478 /* Use the passed value for assumed length variables. */
1479 if (!f->sym->ts.cl->length)
1481 TREE_USED (length) = 1;
1482 gcc_assert (!f->sym->ts.cl->backend_decl);
1483 f->sym->ts.cl->backend_decl = length;
1486 hidden_typelist = TREE_CHAIN (hidden_typelist);
1488 if (f->sym->ts.cl->backend_decl == NULL
1489 || f->sym->ts.cl->backend_decl == length)
1491 if (f->sym->ts.cl->backend_decl == NULL)
1492 gfc_create_string_length (f->sym);
1494 /* Make sure PARM_DECL type doesn't point to incomplete type. */
1495 if (f->sym->attr.flavor == FL_PROCEDURE)
1496 type = build_pointer_type (gfc_get_function_type (f->sym));
1498 type = gfc_sym_type (f->sym);
1502 /* For non-constant length array arguments, make sure they use
1503 a different type node from TYPE_ARG_TYPES type. */
1504 if (f->sym->attr.dimension
1505 && type == TREE_VALUE (typelist)
1506 && TREE_CODE (type) == POINTER_TYPE
1507 && GFC_ARRAY_TYPE_P (type)
1508 && f->sym->as->type != AS_ASSUMED_SIZE
1509 && ! COMPLETE_TYPE_P (TREE_TYPE (type)))
1511 if (f->sym->attr.flavor == FL_PROCEDURE)
1512 type = build_pointer_type (gfc_get_function_type (f->sym));
1514 type = gfc_sym_type (f->sym);
1517 /* Build a the argument declaration. */
1518 parm = build_decl (PARM_DECL, gfc_sym_identifier (f->sym), type);
1520 /* Fill in arg stuff. */
1521 DECL_CONTEXT (parm) = fndecl;
1522 DECL_ARG_TYPE (parm) = TREE_VALUE (typelist);
1523 /* All implementation args are read-only. */
1524 TREE_READONLY (parm) = 1;
1526 gfc_finish_decl (parm);
1528 f->sym->backend_decl = parm;
1530 arglist = chainon (arglist, parm);
1531 typelist = TREE_CHAIN (typelist);
1534 /* Add the hidden string length parameters. */
1535 arglist = chainon (arglist, hidden_arglist);
1537 gcc_assert (hidden_typelist == NULL_TREE
1538 || TREE_VALUE (hidden_typelist) == void_type_node);
1539 DECL_ARGUMENTS (fndecl) = arglist;
1542 /* Convert FNDECL's code to GIMPLE and handle any nested functions. */
1545 gfc_gimplify_function (tree fndecl)
1547 struct cgraph_node *cgn;
1549 gimplify_function_tree (fndecl);
1550 dump_function (TDI_generic, fndecl);
1552 /* Generate errors for structured block violations. */
1553 /* ??? Could be done as part of resolve_labels. */
1555 diagnose_omp_structured_block_errors (fndecl);
1557 /* Convert all nested functions to GIMPLE now. We do things in this order
1558 so that items like VLA sizes are expanded properly in the context of the
1559 correct function. */
1560 cgn = cgraph_node (fndecl);
1561 for (cgn = cgn->nested; cgn; cgn = cgn->next_nested)
1562 gfc_gimplify_function (cgn->decl);
1566 /* Do the setup necessary before generating the body of a function. */
1569 trans_function_start (gfc_symbol * sym)
1573 fndecl = sym->backend_decl;
1575 /* Let GCC know the current scope is this function. */
1576 current_function_decl = fndecl;
1578 /* Let the world know what we're about to do. */
1579 announce_function (fndecl);
1581 if (DECL_CONTEXT (fndecl) == NULL_TREE)
1583 /* Create RTL for function declaration. */
1584 rest_of_decl_compilation (fndecl, 1, 0);
1587 /* Create RTL for function definition. */
1588 make_decl_rtl (fndecl);
1590 init_function_start (fndecl);
1592 /* Even though we're inside a function body, we still don't want to
1593 call expand_expr to calculate the size of a variable-sized array.
1594 We haven't necessarily assigned RTL to all variables yet, so it's
1595 not safe to try to expand expressions involving them. */
1596 cfun->x_dont_save_pending_sizes_p = 1;
1598 /* function.c requires a push at the start of the function. */
1602 /* Create thunks for alternate entry points. */
1605 build_entry_thunks (gfc_namespace * ns)
1607 gfc_formal_arglist *formal;
1608 gfc_formal_arglist *thunk_formal;
1610 gfc_symbol *thunk_sym;
1618 /* This should always be a toplevel function. */
1619 gcc_assert (current_function_decl == NULL_TREE);
1621 gfc_get_backend_locus (&old_loc);
1622 for (el = ns->entries; el; el = el->next)
1624 thunk_sym = el->sym;
1626 build_function_decl (thunk_sym);
1627 create_function_arglist (thunk_sym);
1629 trans_function_start (thunk_sym);
1631 thunk_fndecl = thunk_sym->backend_decl;
1633 gfc_start_block (&body);
1635 /* Pass extra parameter identifying this entry point. */
1636 tmp = build_int_cst (gfc_array_index_type, el->id);
1637 args = tree_cons (NULL_TREE, tmp, NULL_TREE);
1638 string_args = NULL_TREE;
1640 if (thunk_sym->attr.function)
1642 if (gfc_return_by_reference (ns->proc_name))
1644 tree ref = DECL_ARGUMENTS (current_function_decl);
1645 args = tree_cons (NULL_TREE, ref, args);
1646 if (ns->proc_name->ts.type == BT_CHARACTER)
1647 args = tree_cons (NULL_TREE, TREE_CHAIN (ref),
1652 for (formal = ns->proc_name->formal; formal; formal = formal->next)
1654 /* Ignore alternate returns. */
1655 if (formal->sym == NULL)
1658 /* We don't have a clever way of identifying arguments, so resort to
1659 a brute-force search. */
1660 for (thunk_formal = thunk_sym->formal;
1662 thunk_formal = thunk_formal->next)
1664 if (thunk_formal->sym == formal->sym)
1670 /* Pass the argument. */
1671 DECL_ARTIFICIAL (thunk_formal->sym->backend_decl) = 1;
1672 args = tree_cons (NULL_TREE, thunk_formal->sym->backend_decl,
1674 if (formal->sym->ts.type == BT_CHARACTER)
1676 tmp = thunk_formal->sym->ts.cl->backend_decl;
1677 string_args = tree_cons (NULL_TREE, tmp, string_args);
1682 /* Pass NULL for a missing argument. */
1683 args = tree_cons (NULL_TREE, null_pointer_node, args);
1684 if (formal->sym->ts.type == BT_CHARACTER)
1686 tmp = build_int_cst (gfc_charlen_type_node, 0);
1687 string_args = tree_cons (NULL_TREE, tmp, string_args);
1692 /* Call the master function. */
1693 args = nreverse (args);
1694 args = chainon (args, nreverse (string_args));
1695 tmp = ns->proc_name->backend_decl;
1696 tmp = build_function_call_expr (tmp, args);
1697 if (ns->proc_name->attr.mixed_entry_master)
1699 tree union_decl, field;
1700 tree master_type = TREE_TYPE (ns->proc_name->backend_decl);
1702 union_decl = build_decl (VAR_DECL, get_identifier ("__result"),
1703 TREE_TYPE (master_type));
1704 DECL_ARTIFICIAL (union_decl) = 1;
1705 DECL_EXTERNAL (union_decl) = 0;
1706 TREE_PUBLIC (union_decl) = 0;
1707 TREE_USED (union_decl) = 1;
1708 layout_decl (union_decl, 0);
1709 pushdecl (union_decl);
1711 DECL_CONTEXT (union_decl) = current_function_decl;
1712 tmp = build2 (MODIFY_EXPR,
1713 TREE_TYPE (union_decl),
1715 gfc_add_expr_to_block (&body, tmp);
1717 for (field = TYPE_FIELDS (TREE_TYPE (union_decl));
1718 field; field = TREE_CHAIN (field))
1719 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (field)),
1720 thunk_sym->result->name) == 0)
1722 gcc_assert (field != NULL_TREE);
1723 tmp = build3 (COMPONENT_REF, TREE_TYPE (field), union_decl, field,
1725 tmp = build2 (MODIFY_EXPR,
1726 TREE_TYPE (DECL_RESULT (current_function_decl)),
1727 DECL_RESULT (current_function_decl), tmp);
1728 tmp = build1_v (RETURN_EXPR, tmp);
1730 else if (TREE_TYPE (DECL_RESULT (current_function_decl))
1733 tmp = build2 (MODIFY_EXPR,
1734 TREE_TYPE (DECL_RESULT (current_function_decl)),
1735 DECL_RESULT (current_function_decl), tmp);
1736 tmp = build1_v (RETURN_EXPR, tmp);
1738 gfc_add_expr_to_block (&body, tmp);
1740 /* Finish off this function and send it for code generation. */
1741 DECL_SAVED_TREE (thunk_fndecl) = gfc_finish_block (&body);
1743 BLOCK_SUPERCONTEXT (DECL_INITIAL (thunk_fndecl)) = thunk_fndecl;
1745 /* Output the GENERIC tree. */
1746 dump_function (TDI_original, thunk_fndecl);
1748 /* Store the end of the function, so that we get good line number
1749 info for the epilogue. */
1750 cfun->function_end_locus = input_location;
1752 /* We're leaving the context of this function, so zap cfun.
1753 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
1754 tree_rest_of_compilation. */
1757 current_function_decl = NULL_TREE;
1759 gfc_gimplify_function (thunk_fndecl);
1760 cgraph_finalize_function (thunk_fndecl, false);
1762 /* We share the symbols in the formal argument list with other entry
1763 points and the master function. Clear them so that they are
1764 recreated for each function. */
1765 for (formal = thunk_sym->formal; formal; formal = formal->next)
1766 if (formal->sym != NULL) /* Ignore alternate returns. */
1768 formal->sym->backend_decl = NULL_TREE;
1769 if (formal->sym->ts.type == BT_CHARACTER)
1770 formal->sym->ts.cl->backend_decl = NULL_TREE;
1773 if (thunk_sym->attr.function)
1775 if (thunk_sym->ts.type == BT_CHARACTER)
1776 thunk_sym->ts.cl->backend_decl = NULL_TREE;
1777 if (thunk_sym->result->ts.type == BT_CHARACTER)
1778 thunk_sym->result->ts.cl->backend_decl = NULL_TREE;
1782 gfc_set_backend_locus (&old_loc);
1786 /* Create a decl for a function, and create any thunks for alternate entry
1790 gfc_create_function_decl (gfc_namespace * ns)
1792 /* Create a declaration for the master function. */
1793 build_function_decl (ns->proc_name);
1795 /* Compile the entry thunks. */
1797 build_entry_thunks (ns);
1799 /* Now create the read argument list. */
1800 create_function_arglist (ns->proc_name);
1803 /* Return the decl used to hold the function return value. If
1804 parent_flag is set, the context is the parent_scope. */
1807 gfc_get_fake_result_decl (gfc_symbol * sym, int parent_flag)
1811 tree this_fake_result_decl;
1812 tree this_function_decl;
1814 char name[GFC_MAX_SYMBOL_LEN + 10];
1818 this_fake_result_decl = parent_fake_result_decl;
1819 this_function_decl = DECL_CONTEXT (current_function_decl);
1823 this_fake_result_decl = current_fake_result_decl;
1824 this_function_decl = current_function_decl;
1828 && sym->ns->proc_name->backend_decl == this_function_decl
1829 && sym->ns->proc_name->attr.entry_master
1830 && sym != sym->ns->proc_name)
1833 if (this_fake_result_decl != NULL)
1834 for (t = TREE_CHAIN (this_fake_result_decl); t; t = TREE_CHAIN (t))
1835 if (strcmp (IDENTIFIER_POINTER (TREE_PURPOSE (t)), sym->name) == 0)
1838 return TREE_VALUE (t);
1839 decl = gfc_get_fake_result_decl (sym->ns->proc_name, parent_flag);
1842 this_fake_result_decl = parent_fake_result_decl;
1844 this_fake_result_decl = current_fake_result_decl;
1846 if (decl && sym->ns->proc_name->attr.mixed_entry_master)
1850 for (field = TYPE_FIELDS (TREE_TYPE (decl));
1851 field; field = TREE_CHAIN (field))
1852 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (field)),
1856 gcc_assert (field != NULL_TREE);
1857 decl = build3 (COMPONENT_REF, TREE_TYPE (field), decl, field,
1861 var = create_tmp_var_raw (TREE_TYPE (decl), sym->name);
1863 gfc_add_decl_to_parent_function (var);
1865 gfc_add_decl_to_function (var);
1867 SET_DECL_VALUE_EXPR (var, decl);
1868 DECL_HAS_VALUE_EXPR_P (var) = 1;
1869 GFC_DECL_RESULT (var) = 1;
1871 TREE_CHAIN (this_fake_result_decl)
1872 = tree_cons (get_identifier (sym->name), var,
1873 TREE_CHAIN (this_fake_result_decl));
1877 if (this_fake_result_decl != NULL_TREE)
1878 return TREE_VALUE (this_fake_result_decl);
1880 /* Only when gfc_get_fake_result_decl is called by gfc_trans_return,
1885 if (sym->ts.type == BT_CHARACTER)
1887 if (sym->ts.cl->backend_decl == NULL_TREE)
1888 length = gfc_create_string_length (sym);
1890 length = sym->ts.cl->backend_decl;
1891 if (TREE_CODE (length) == VAR_DECL
1892 && DECL_CONTEXT (length) == NULL_TREE)
1893 gfc_add_decl_to_function (length);
1896 if (gfc_return_by_reference (sym))
1898 decl = DECL_ARGUMENTS (this_function_decl);
1900 if (sym->ns->proc_name->backend_decl == this_function_decl
1901 && sym->ns->proc_name->attr.entry_master)
1902 decl = TREE_CHAIN (decl);
1904 TREE_USED (decl) = 1;
1906 decl = gfc_build_dummy_array_decl (sym, decl);
1910 sprintf (name, "__result_%.20s",
1911 IDENTIFIER_POINTER (DECL_NAME (this_function_decl)));
1913 if (!sym->attr.mixed_entry_master && sym->attr.function)
1914 decl = build_decl (VAR_DECL, get_identifier (name),
1915 gfc_sym_type (sym));
1917 decl = build_decl (VAR_DECL, get_identifier (name),
1918 TREE_TYPE (TREE_TYPE (this_function_decl)));
1919 DECL_ARTIFICIAL (decl) = 1;
1920 DECL_EXTERNAL (decl) = 0;
1921 TREE_PUBLIC (decl) = 0;
1922 TREE_USED (decl) = 1;
1923 GFC_DECL_RESULT (decl) = 1;
1924 TREE_ADDRESSABLE (decl) = 1;
1926 layout_decl (decl, 0);
1929 gfc_add_decl_to_parent_function (decl);
1931 gfc_add_decl_to_function (decl);
1935 parent_fake_result_decl = build_tree_list (NULL, decl);
1937 current_fake_result_decl = build_tree_list (NULL, decl);
1943 /* Builds a function decl. The remaining parameters are the types of the
1944 function arguments. Negative nargs indicates a varargs function. */
1947 gfc_build_library_function_decl (tree name, tree rettype, int nargs, ...)
1956 /* Library functions must be declared with global scope. */
1957 gcc_assert (current_function_decl == NULL_TREE);
1959 va_start (p, nargs);
1962 /* Create a list of the argument types. */
1963 for (arglist = NULL_TREE, n = abs (nargs); n > 0; n--)
1965 argtype = va_arg (p, tree);
1966 arglist = gfc_chainon_list (arglist, argtype);
1971 /* Terminate the list. */
1972 arglist = gfc_chainon_list (arglist, void_type_node);
1975 /* Build the function type and decl. */
1976 fntype = build_function_type (rettype, arglist);
1977 fndecl = build_decl (FUNCTION_DECL, name, fntype);
1979 /* Mark this decl as external. */
1980 DECL_EXTERNAL (fndecl) = 1;
1981 TREE_PUBLIC (fndecl) = 1;
1987 rest_of_decl_compilation (fndecl, 1, 0);
1993 gfc_build_intrinsic_function_decls (void)
1995 tree gfc_int4_type_node = gfc_get_int_type (4);
1996 tree gfc_int8_type_node = gfc_get_int_type (8);
1997 tree gfc_int16_type_node = gfc_get_int_type (16);
1998 tree gfc_logical4_type_node = gfc_get_logical_type (4);
1999 tree gfc_real4_type_node = gfc_get_real_type (4);
2000 tree gfc_real8_type_node = gfc_get_real_type (8);
2001 tree gfc_real10_type_node = gfc_get_real_type (10);
2002 tree gfc_real16_type_node = gfc_get_real_type (16);
2003 tree gfc_complex4_type_node = gfc_get_complex_type (4);
2004 tree gfc_complex8_type_node = gfc_get_complex_type (8);
2005 tree gfc_complex10_type_node = gfc_get_complex_type (10);
2006 tree gfc_complex16_type_node = gfc_get_complex_type (16);
2008 /* String functions. */
2009 gfor_fndecl_compare_string =
2010 gfc_build_library_function_decl (get_identifier (PREFIX("compare_string")),
2011 integer_type_node, 4,
2012 gfc_charlen_type_node, pchar_type_node,
2013 gfc_charlen_type_node, pchar_type_node);
2015 gfor_fndecl_concat_string =
2016 gfc_build_library_function_decl (get_identifier (PREFIX("concat_string")),
2019 gfc_charlen_type_node, pchar_type_node,
2020 gfc_charlen_type_node, pchar_type_node,
2021 gfc_charlen_type_node, pchar_type_node);
2023 gfor_fndecl_string_len_trim =
2024 gfc_build_library_function_decl (get_identifier (PREFIX("string_len_trim")),
2026 2, gfc_charlen_type_node,
2029 gfor_fndecl_string_index =
2030 gfc_build_library_function_decl (get_identifier (PREFIX("string_index")),
2032 5, gfc_charlen_type_node, pchar_type_node,
2033 gfc_charlen_type_node, pchar_type_node,
2034 gfc_logical4_type_node);
2036 gfor_fndecl_string_scan =
2037 gfc_build_library_function_decl (get_identifier (PREFIX("string_scan")),
2039 5, gfc_charlen_type_node, pchar_type_node,
2040 gfc_charlen_type_node, pchar_type_node,
2041 gfc_logical4_type_node);
2043 gfor_fndecl_string_verify =
2044 gfc_build_library_function_decl (get_identifier (PREFIX("string_verify")),
2046 5, gfc_charlen_type_node, pchar_type_node,
2047 gfc_charlen_type_node, pchar_type_node,
2048 gfc_logical4_type_node);
2050 gfor_fndecl_string_trim =
2051 gfc_build_library_function_decl (get_identifier (PREFIX("string_trim")),
2054 build_pointer_type (gfc_charlen_type_node),
2056 gfc_charlen_type_node,
2059 gfor_fndecl_string_minmax =
2060 gfc_build_library_function_decl (get_identifier (PREFIX("string_minmax")),
2062 build_pointer_type (gfc_charlen_type_node),
2063 ppvoid_type_node, integer_type_node,
2066 gfor_fndecl_ttynam =
2067 gfc_build_library_function_decl (get_identifier (PREFIX("ttynam")),
2071 gfc_charlen_type_node,
2075 gfc_build_library_function_decl (get_identifier (PREFIX("fdate")),
2079 gfc_charlen_type_node);
2082 gfc_build_library_function_decl (get_identifier (PREFIX("ctime")),
2086 gfc_charlen_type_node,
2087 gfc_int8_type_node);
2089 gfor_fndecl_adjustl =
2090 gfc_build_library_function_decl (get_identifier (PREFIX("adjustl")),
2094 gfc_charlen_type_node, pchar_type_node);
2096 gfor_fndecl_adjustr =
2097 gfc_build_library_function_decl (get_identifier (PREFIX("adjustr")),
2101 gfc_charlen_type_node, pchar_type_node);
2103 gfor_fndecl_si_kind =
2104 gfc_build_library_function_decl (get_identifier
2105 (PREFIX("selected_int_kind")),
2110 gfor_fndecl_sr_kind =
2111 gfc_build_library_function_decl (get_identifier
2112 (PREFIX("selected_real_kind")),
2117 /* Power functions. */
2119 tree ctype, rtype, itype, jtype;
2120 int rkind, ikind, jkind;
2123 static int ikinds[NIKINDS] = {4, 8, 16};
2124 static int rkinds[NRKINDS] = {4, 8, 10, 16};
2125 char name[PREFIX_LEN + 12]; /* _gfortran_pow_?n_?n */
2127 for (ikind=0; ikind < NIKINDS; ikind++)
2129 itype = gfc_get_int_type (ikinds[ikind]);
2131 for (jkind=0; jkind < NIKINDS; jkind++)
2133 jtype = gfc_get_int_type (ikinds[jkind]);
2136 sprintf(name, PREFIX("pow_i%d_i%d"), ikinds[ikind],
2138 gfor_fndecl_math_powi[jkind][ikind].integer =
2139 gfc_build_library_function_decl (get_identifier (name),
2140 jtype, 2, jtype, itype);
2141 TREE_READONLY (gfor_fndecl_math_powi[jkind][ikind].integer) = 1;
2145 for (rkind = 0; rkind < NRKINDS; rkind ++)
2147 rtype = gfc_get_real_type (rkinds[rkind]);
2150 sprintf(name, PREFIX("pow_r%d_i%d"), rkinds[rkind],
2152 gfor_fndecl_math_powi[rkind][ikind].real =
2153 gfc_build_library_function_decl (get_identifier (name),
2154 rtype, 2, rtype, itype);
2155 TREE_READONLY (gfor_fndecl_math_powi[rkind][ikind].real) = 1;
2158 ctype = gfc_get_complex_type (rkinds[rkind]);
2161 sprintf(name, PREFIX("pow_c%d_i%d"), rkinds[rkind],
2163 gfor_fndecl_math_powi[rkind][ikind].cmplx =
2164 gfc_build_library_function_decl (get_identifier (name),
2165 ctype, 2,ctype, itype);
2166 TREE_READONLY (gfor_fndecl_math_powi[rkind][ikind].cmplx) = 1;
2174 gfor_fndecl_math_cpowf =
2175 gfc_build_library_function_decl (get_identifier ("cpowf"),
2176 gfc_complex4_type_node,
2177 1, gfc_complex4_type_node);
2178 gfor_fndecl_math_cpow =
2179 gfc_build_library_function_decl (get_identifier ("cpow"),
2180 gfc_complex8_type_node,
2181 1, gfc_complex8_type_node);
2182 if (gfc_complex10_type_node)
2183 gfor_fndecl_math_cpowl10 =
2184 gfc_build_library_function_decl (get_identifier ("cpowl"),
2185 gfc_complex10_type_node, 1,
2186 gfc_complex10_type_node);
2187 if (gfc_complex16_type_node)
2188 gfor_fndecl_math_cpowl16 =
2189 gfc_build_library_function_decl (get_identifier ("cpowl"),
2190 gfc_complex16_type_node, 1,
2191 gfc_complex16_type_node);
2193 gfor_fndecl_math_ishftc4 =
2194 gfc_build_library_function_decl (get_identifier (PREFIX("ishftc4")),
2196 3, gfc_int4_type_node,
2197 gfc_int4_type_node, gfc_int4_type_node);
2198 gfor_fndecl_math_ishftc8 =
2199 gfc_build_library_function_decl (get_identifier (PREFIX("ishftc8")),
2201 3, gfc_int8_type_node,
2202 gfc_int4_type_node, gfc_int4_type_node);
2203 if (gfc_int16_type_node)
2204 gfor_fndecl_math_ishftc16 =
2205 gfc_build_library_function_decl (get_identifier (PREFIX("ishftc16")),
2206 gfc_int16_type_node, 3,
2207 gfc_int16_type_node,
2209 gfc_int4_type_node);
2211 gfor_fndecl_math_exponent4 =
2212 gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r4")),
2214 1, gfc_real4_type_node);
2215 gfor_fndecl_math_exponent8 =
2216 gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r8")),
2218 1, gfc_real8_type_node);
2219 if (gfc_real10_type_node)
2220 gfor_fndecl_math_exponent10 =
2221 gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r10")),
2222 gfc_int4_type_node, 1,
2223 gfc_real10_type_node);
2224 if (gfc_real16_type_node)
2225 gfor_fndecl_math_exponent16 =
2226 gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r16")),
2227 gfc_int4_type_node, 1,
2228 gfc_real16_type_node);
2230 /* BLAS functions. */
2232 tree pint = build_pointer_type (integer_type_node);
2233 tree ps = build_pointer_type (gfc_get_real_type (gfc_default_real_kind));
2234 tree pd = build_pointer_type (gfc_get_real_type (gfc_default_double_kind));
2235 tree pc = build_pointer_type (gfc_get_complex_type (gfc_default_real_kind));
2236 tree pz = build_pointer_type
2237 (gfc_get_complex_type (gfc_default_double_kind));
2239 gfor_fndecl_sgemm = gfc_build_library_function_decl
2241 (gfc_option.flag_underscoring ? "sgemm_"
2243 void_type_node, 15, pchar_type_node,
2244 pchar_type_node, pint, pint, pint, ps, ps, pint,
2245 ps, pint, ps, ps, pint, integer_type_node,
2247 gfor_fndecl_dgemm = gfc_build_library_function_decl
2249 (gfc_option.flag_underscoring ? "dgemm_"
2251 void_type_node, 15, pchar_type_node,
2252 pchar_type_node, pint, pint, pint, pd, pd, pint,
2253 pd, pint, pd, pd, pint, integer_type_node,
2255 gfor_fndecl_cgemm = gfc_build_library_function_decl
2257 (gfc_option.flag_underscoring ? "cgemm_"
2259 void_type_node, 15, pchar_type_node,
2260 pchar_type_node, pint, pint, pint, pc, pc, pint,
2261 pc, pint, pc, pc, pint, integer_type_node,
2263 gfor_fndecl_zgemm = gfc_build_library_function_decl
2265 (gfc_option.flag_underscoring ? "zgemm_"
2267 void_type_node, 15, pchar_type_node,
2268 pchar_type_node, pint, pint, pint, pz, pz, pint,
2269 pz, pint, pz, pz, pint, integer_type_node,
2273 /* Other functions. */
2275 gfc_build_library_function_decl (get_identifier (PREFIX("size0")),
2276 gfc_array_index_type,
2277 1, pvoid_type_node);
2279 gfc_build_library_function_decl (get_identifier (PREFIX("size1")),
2280 gfc_array_index_type,
2282 gfc_array_index_type);
2285 gfc_build_library_function_decl (get_identifier (PREFIX ("iargc")),
2291 /* Make prototypes for runtime library functions. */
2294 gfc_build_builtin_function_decls (void)
2296 tree gfc_int4_type_node = gfc_get_int_type (4);
2298 gfor_fndecl_stop_numeric =
2299 gfc_build_library_function_decl (get_identifier (PREFIX("stop_numeric")),
2300 void_type_node, 1, gfc_int4_type_node);
2301 /* Stop doesn't return. */
2302 TREE_THIS_VOLATILE (gfor_fndecl_stop_numeric) = 1;
2304 gfor_fndecl_stop_string =
2305 gfc_build_library_function_decl (get_identifier (PREFIX("stop_string")),
2306 void_type_node, 2, pchar_type_node,
2307 gfc_int4_type_node);
2308 /* Stop doesn't return. */
2309 TREE_THIS_VOLATILE (gfor_fndecl_stop_string) = 1;
2311 gfor_fndecl_pause_numeric =
2312 gfc_build_library_function_decl (get_identifier (PREFIX("pause_numeric")),
2313 void_type_node, 1, gfc_int4_type_node);
2315 gfor_fndecl_pause_string =
2316 gfc_build_library_function_decl (get_identifier (PREFIX("pause_string")),
2317 void_type_node, 2, pchar_type_node,
2318 gfc_int4_type_node);
2320 gfor_fndecl_select_string =
2321 gfc_build_library_function_decl (get_identifier (PREFIX("select_string")),
2322 integer_type_node, 0);
2324 gfor_fndecl_runtime_error =
2325 gfc_build_library_function_decl (get_identifier (PREFIX("runtime_error")),
2326 void_type_node, -1, pchar_type_node);
2327 /* The runtime_error function does not return. */
2328 TREE_THIS_VOLATILE (gfor_fndecl_runtime_error) = 1;
2330 gfor_fndecl_runtime_error_at =
2331 gfc_build_library_function_decl (get_identifier (PREFIX("runtime_error_at")),
2332 void_type_node, -2, pchar_type_node,
2334 /* The runtime_error_at function does not return. */
2335 TREE_THIS_VOLATILE (gfor_fndecl_runtime_error_at) = 1;
2337 gfor_fndecl_generate_error =
2338 gfc_build_library_function_decl (get_identifier (PREFIX("generate_error")),
2339 void_type_node, 3, pvoid_type_node,
2340 integer_type_node, pchar_type_node);
2342 gfor_fndecl_os_error =
2343 gfc_build_library_function_decl (get_identifier (PREFIX("os_error")),
2344 void_type_node, 1, pchar_type_node);
2345 /* The runtime_error function does not return. */
2346 TREE_THIS_VOLATILE (gfor_fndecl_os_error) = 1;
2348 gfor_fndecl_set_fpe =
2349 gfc_build_library_function_decl (get_identifier (PREFIX("set_fpe")),
2350 void_type_node, 1, integer_type_node);
2352 /* Keep the array dimension in sync with the call, later in this file. */
2353 gfor_fndecl_set_options =
2354 gfc_build_library_function_decl (get_identifier (PREFIX("set_options")),
2355 void_type_node, 2, integer_type_node,
2358 gfor_fndecl_set_convert =
2359 gfc_build_library_function_decl (get_identifier (PREFIX("set_convert")),
2360 void_type_node, 1, integer_type_node);
2362 gfor_fndecl_set_record_marker =
2363 gfc_build_library_function_decl (get_identifier (PREFIX("set_record_marker")),
2364 void_type_node, 1, integer_type_node);
2366 gfor_fndecl_set_max_subrecord_length =
2367 gfc_build_library_function_decl (get_identifier (PREFIX("set_max_subrecord_length")),
2368 void_type_node, 1, integer_type_node);
2370 gfor_fndecl_in_pack = gfc_build_library_function_decl (
2371 get_identifier (PREFIX("internal_pack")),
2372 pvoid_type_node, 1, pvoid_type_node);
2374 gfor_fndecl_in_unpack = gfc_build_library_function_decl (
2375 get_identifier (PREFIX("internal_unpack")),
2376 pvoid_type_node, 1, pvoid_type_node);
2378 gfor_fndecl_associated =
2379 gfc_build_library_function_decl (
2380 get_identifier (PREFIX("associated")),
2381 integer_type_node, 2, ppvoid_type_node,
2384 gfc_build_intrinsic_function_decls ();
2385 gfc_build_intrinsic_lib_fndecls ();
2386 gfc_build_io_library_fndecls ();
2390 /* Evaluate the length of dummy character variables. */
2393 gfc_trans_dummy_character (gfc_symbol *sym, gfc_charlen *cl, tree fnbody)
2397 gfc_finish_decl (cl->backend_decl);
2399 gfc_start_block (&body);
2401 /* Evaluate the string length expression. */
2402 gfc_conv_string_length (cl, &body);
2404 gfc_trans_vla_type_sizes (sym, &body);
2406 gfc_add_expr_to_block (&body, fnbody);
2407 return gfc_finish_block (&body);
2411 /* Allocate and cleanup an automatic character variable. */
2414 gfc_trans_auto_character_variable (gfc_symbol * sym, tree fnbody)
2420 gcc_assert (sym->backend_decl);
2421 gcc_assert (sym->ts.cl && sym->ts.cl->length);
2423 gfc_start_block (&body);
2425 /* Evaluate the string length expression. */
2426 gfc_conv_string_length (sym->ts.cl, &body);
2428 gfc_trans_vla_type_sizes (sym, &body);
2430 decl = sym->backend_decl;
2432 /* Emit a DECL_EXPR for this variable, which will cause the
2433 gimplifier to allocate storage, and all that good stuff. */
2434 tmp = build1 (DECL_EXPR, TREE_TYPE (decl), decl);
2435 gfc_add_expr_to_block (&body, tmp);
2437 gfc_add_expr_to_block (&body, fnbody);
2438 return gfc_finish_block (&body);
2441 /* Set the initial value of ASSIGN statement auxiliary variable explicitly. */
2444 gfc_trans_assign_aux_var (gfc_symbol * sym, tree fnbody)
2448 gcc_assert (sym->backend_decl);
2449 gfc_start_block (&body);
2451 /* Set the initial value to length. See the comments in
2452 function gfc_add_assign_aux_vars in this file. */
2453 gfc_add_modify_expr (&body, GFC_DECL_STRING_LEN (sym->backend_decl),
2454 build_int_cst (NULL_TREE, -2));
2456 gfc_add_expr_to_block (&body, fnbody);
2457 return gfc_finish_block (&body);
2461 gfc_trans_vla_one_sizepos (tree *tp, stmtblock_t *body)
2463 tree t = *tp, var, val;
2465 if (t == NULL || t == error_mark_node)
2467 if (TREE_CONSTANT (t) || DECL_P (t))
2470 if (TREE_CODE (t) == SAVE_EXPR)
2472 if (SAVE_EXPR_RESOLVED_P (t))
2474 *tp = TREE_OPERAND (t, 0);
2477 val = TREE_OPERAND (t, 0);
2482 var = gfc_create_var_np (TREE_TYPE (t), NULL);
2483 gfc_add_decl_to_function (var);
2484 gfc_add_modify_expr (body, var, val);
2485 if (TREE_CODE (t) == SAVE_EXPR)
2486 TREE_OPERAND (t, 0) = var;
2491 gfc_trans_vla_type_sizes_1 (tree type, stmtblock_t *body)
2495 if (type == NULL || type == error_mark_node)
2498 type = TYPE_MAIN_VARIANT (type);
2500 if (TREE_CODE (type) == INTEGER_TYPE)
2502 gfc_trans_vla_one_sizepos (&TYPE_MIN_VALUE (type), body);
2503 gfc_trans_vla_one_sizepos (&TYPE_MAX_VALUE (type), body);
2505 for (t = TYPE_NEXT_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
2507 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (type);
2508 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (type);
2511 else if (TREE_CODE (type) == ARRAY_TYPE)
2513 gfc_trans_vla_type_sizes_1 (TREE_TYPE (type), body);
2514 gfc_trans_vla_type_sizes_1 (TYPE_DOMAIN (type), body);
2515 gfc_trans_vla_one_sizepos (&TYPE_SIZE (type), body);
2516 gfc_trans_vla_one_sizepos (&TYPE_SIZE_UNIT (type), body);
2518 for (t = TYPE_NEXT_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
2520 TYPE_SIZE (t) = TYPE_SIZE (type);
2521 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (type);
2526 /* Make sure all type sizes and array domains are either constant,
2527 or variable or parameter decls. This is a simplified variant
2528 of gimplify_type_sizes, but we can't use it here, as none of the
2529 variables in the expressions have been gimplified yet.
2530 As type sizes and domains for various variable length arrays
2531 contain VAR_DECLs that are only initialized at gfc_trans_deferred_vars
2532 time, without this routine gimplify_type_sizes in the middle-end
2533 could result in the type sizes being gimplified earlier than where
2534 those variables are initialized. */
2537 gfc_trans_vla_type_sizes (gfc_symbol *sym, stmtblock_t *body)
2539 tree type = TREE_TYPE (sym->backend_decl);
2541 if (TREE_CODE (type) == FUNCTION_TYPE
2542 && (sym->attr.function || sym->attr.result || sym->attr.entry))
2544 if (! current_fake_result_decl)
2547 type = TREE_TYPE (TREE_VALUE (current_fake_result_decl));
2550 while (POINTER_TYPE_P (type))
2551 type = TREE_TYPE (type);
2553 if (GFC_DESCRIPTOR_TYPE_P (type))
2555 tree etype = GFC_TYPE_ARRAY_DATAPTR_TYPE (type);
2557 while (POINTER_TYPE_P (etype))
2558 etype = TREE_TYPE (etype);
2560 gfc_trans_vla_type_sizes_1 (etype, body);
2563 gfc_trans_vla_type_sizes_1 (type, body);
2567 /* Initialize INTENT(OUT) derived type dummies. */
2569 init_intent_out_dt (gfc_symbol * proc_sym, tree body)
2571 stmtblock_t fnblock;
2572 gfc_formal_arglist *f;
2577 gfc_init_block (&fnblock);
2579 for (f = proc_sym->formal; f; f = f->next)
2581 if (f->sym && f->sym->attr.intent == INTENT_OUT
2582 && f->sym->ts.type == BT_DERIVED
2583 && !f->sym->ts.derived->attr.alloc_comp
2586 gcc_assert (!f->sym->attr.allocatable);
2587 gfc_set_sym_referenced (f->sym);
2588 tmpe = gfc_lval_expr_from_sym (f->sym);
2589 tmp = gfc_trans_assignment (tmpe, f->sym->value, false);
2591 present = gfc_conv_expr_present (f->sym);
2592 tmp = build3 (COND_EXPR, TREE_TYPE (tmp), present,
2593 tmp, build_empty_stmt ());
2594 gfc_add_expr_to_block (&fnblock, tmp);
2595 gfc_free_expr (tmpe);
2599 gfc_add_expr_to_block (&fnblock, body);
2600 return gfc_finish_block (&fnblock);
2605 /* Generate function entry and exit code, and add it to the function body.
2607 Allocation and initialization of array variables.
2608 Allocation of character string variables.
2609 Initialization and possibly repacking of dummy arrays.
2610 Initialization of ASSIGN statement auxiliary variable. */
2613 gfc_trans_deferred_vars (gfc_symbol * proc_sym, tree fnbody)
2617 gfc_formal_arglist *f;
2619 bool seen_trans_deferred_array = false;
2621 /* Deal with implicit return variables. Explicit return variables will
2622 already have been added. */
2623 if (gfc_return_by_reference (proc_sym) && proc_sym->result == proc_sym)
2625 if (!current_fake_result_decl)
2627 gfc_entry_list *el = NULL;
2628 if (proc_sym->attr.entry_master)
2630 for (el = proc_sym->ns->entries; el; el = el->next)
2631 if (el->sym != el->sym->result)
2635 warning (0, "Function does not return a value");
2637 else if (proc_sym->as)
2639 tree result = TREE_VALUE (current_fake_result_decl);
2640 fnbody = gfc_trans_dummy_array_bias (proc_sym, result, fnbody);
2642 /* An automatic character length, pointer array result. */
2643 if (proc_sym->ts.type == BT_CHARACTER
2644 && TREE_CODE (proc_sym->ts.cl->backend_decl) == VAR_DECL)
2645 fnbody = gfc_trans_dummy_character (proc_sym, proc_sym->ts.cl,
2648 else if (proc_sym->ts.type == BT_CHARACTER)
2650 if (TREE_CODE (proc_sym->ts.cl->backend_decl) == VAR_DECL)
2651 fnbody = gfc_trans_dummy_character (proc_sym, proc_sym->ts.cl,
2655 gcc_assert (gfc_option.flag_f2c
2656 && proc_sym->ts.type == BT_COMPLEX);
2659 /* Initialize the INTENT(OUT) derived type dummy arguments. This
2660 should be done here so that the offsets and lbounds of arrays
2662 fnbody = init_intent_out_dt (proc_sym, fnbody);
2664 for (sym = proc_sym->tlink; sym != proc_sym; sym = sym->tlink)
2666 bool sym_has_alloc_comp = (sym->ts.type == BT_DERIVED)
2667 && sym->ts.derived->attr.alloc_comp;
2668 if (sym->attr.dimension)
2670 switch (sym->as->type)
2673 if (sym->attr.dummy || sym->attr.result)
2675 gfc_trans_dummy_array_bias (sym, sym->backend_decl, fnbody);
2676 else if (sym->attr.pointer || sym->attr.allocatable)
2678 if (TREE_STATIC (sym->backend_decl))
2679 gfc_trans_static_array_pointer (sym);
2682 seen_trans_deferred_array = true;
2683 fnbody = gfc_trans_deferred_array (sym, fnbody);
2688 if (sym_has_alloc_comp)
2690 seen_trans_deferred_array = true;
2691 fnbody = gfc_trans_deferred_array (sym, fnbody);
2694 gfc_get_backend_locus (&loc);
2695 gfc_set_backend_locus (&sym->declared_at);
2696 fnbody = gfc_trans_auto_array_allocation (sym->backend_decl,
2698 gfc_set_backend_locus (&loc);
2702 case AS_ASSUMED_SIZE:
2703 /* Must be a dummy parameter. */
2704 gcc_assert (sym->attr.dummy);
2706 /* We should always pass assumed size arrays the g77 way. */
2707 fnbody = gfc_trans_g77_array (sym, fnbody);
2710 case AS_ASSUMED_SHAPE:
2711 /* Must be a dummy parameter. */
2712 gcc_assert (sym->attr.dummy);
2714 fnbody = gfc_trans_dummy_array_bias (sym, sym->backend_decl,
2719 seen_trans_deferred_array = true;
2720 fnbody = gfc_trans_deferred_array (sym, fnbody);
2726 if (sym_has_alloc_comp && !seen_trans_deferred_array)
2727 fnbody = gfc_trans_deferred_array (sym, fnbody);
2729 else if (sym_has_alloc_comp)
2730 fnbody = gfc_trans_deferred_array (sym, fnbody);
2731 else if (sym->ts.type == BT_CHARACTER)
2733 gfc_get_backend_locus (&loc);
2734 gfc_set_backend_locus (&sym->declared_at);
2735 if (sym->attr.dummy || sym->attr.result)
2736 fnbody = gfc_trans_dummy_character (sym, sym->ts.cl, fnbody);
2738 fnbody = gfc_trans_auto_character_variable (sym, fnbody);
2739 gfc_set_backend_locus (&loc);
2741 else if (sym->attr.assign)
2743 gfc_get_backend_locus (&loc);
2744 gfc_set_backend_locus (&sym->declared_at);
2745 fnbody = gfc_trans_assign_aux_var (sym, fnbody);
2746 gfc_set_backend_locus (&loc);
2752 gfc_init_block (&body);
2754 for (f = proc_sym->formal; f; f = f->next)
2756 if (f->sym && f->sym->tlink == NULL && f->sym->ts.type == BT_CHARACTER)
2758 gcc_assert (f->sym->ts.cl->backend_decl != NULL);
2759 if (TREE_CODE (f->sym->ts.cl->backend_decl) == PARM_DECL)
2760 gfc_trans_vla_type_sizes (f->sym, &body);
2764 if (gfc_return_by_reference (proc_sym) && proc_sym->ts.type == BT_CHARACTER
2765 && current_fake_result_decl != NULL)
2767 gcc_assert (proc_sym->ts.cl->backend_decl != NULL);
2768 if (TREE_CODE (proc_sym->ts.cl->backend_decl) == PARM_DECL)
2769 gfc_trans_vla_type_sizes (proc_sym, &body);
2772 gfc_add_expr_to_block (&body, fnbody);
2773 return gfc_finish_block (&body);
2777 /* Output an initialized decl for a module variable. */
2780 gfc_create_module_variable (gfc_symbol * sym)
2784 /* Module functions with alternate entries are dealt with later and
2785 would get caught by the next condition. */
2786 if (sym->attr.entry)
2789 /* Make sure we convert the types of the derived types from iso_c_binding
2791 if (sym->attr.flavor != FL_PROCEDURE && sym->attr.is_iso_c
2792 && sym->ts.type == BT_DERIVED)
2793 sym->backend_decl = gfc_typenode_for_spec (&(sym->ts));
2795 /* Only output variables and array valued, or derived type,
2797 if (sym->attr.flavor != FL_VARIABLE
2798 && !(sym->attr.flavor == FL_PARAMETER
2799 && (sym->attr.dimension || sym->ts.type == BT_DERIVED)))
2802 /* Don't generate variables from other modules. Variables from
2803 COMMONs will already have been generated. */
2804 if (sym->attr.use_assoc || sym->attr.in_common)
2807 /* Equivalenced variables arrive here after creation. */
2808 if (sym->backend_decl
2809 && (sym->equiv_built || sym->attr.in_equivalence))
2812 if (sym->backend_decl)
2813 internal_error ("backend decl for module variable %s already exists",
2816 /* We always want module variables to be created. */
2817 sym->attr.referenced = 1;
2818 /* Create the decl. */
2819 decl = gfc_get_symbol_decl (sym);
2821 /* Create the variable. */
2823 rest_of_decl_compilation (decl, 1, 0);
2825 /* Also add length of strings. */
2826 if (sym->ts.type == BT_CHARACTER)
2830 length = sym->ts.cl->backend_decl;
2831 if (!INTEGER_CST_P (length))
2834 rest_of_decl_compilation (length, 1, 0);
2840 /* Generate all the required code for module variables. */
2843 gfc_generate_module_vars (gfc_namespace * ns)
2845 module_namespace = ns;
2847 /* Check if the frontend left the namespace in a reasonable state. */
2848 gcc_assert (ns->proc_name && !ns->proc_name->tlink);
2850 /* Generate COMMON blocks. */
2851 gfc_trans_common (ns);
2853 /* Create decls for all the module variables. */
2854 gfc_traverse_ns (ns, gfc_create_module_variable);
2858 gfc_generate_contained_functions (gfc_namespace * parent)
2862 /* We create all the prototypes before generating any code. */
2863 for (ns = parent->contained; ns; ns = ns->sibling)
2865 /* Skip namespaces from used modules. */
2866 if (ns->parent != parent)
2869 gfc_create_function_decl (ns);
2872 for (ns = parent->contained; ns; ns = ns->sibling)
2874 /* Skip namespaces from used modules. */
2875 if (ns->parent != parent)
2878 gfc_generate_function_code (ns);
2883 /* Drill down through expressions for the array specification bounds and
2884 character length calling generate_local_decl for all those variables
2885 that have not already been declared. */
2888 generate_local_decl (gfc_symbol *);
2891 generate_expr_decls (gfc_symbol *sym, gfc_expr *e)
2893 gfc_actual_arglist *arg;
2900 switch (e->expr_type)
2903 for (arg = e->value.function.actual; arg; arg = arg->next)
2904 generate_expr_decls (sym, arg->expr);
2907 /* If the variable is not the same as the dependent, 'sym', and
2908 it is not marked as being declared and it is in the same
2909 namespace as 'sym', add it to the local declarations. */
2911 if (sym == e->symtree->n.sym
2912 || e->symtree->n.sym->mark
2913 || e->symtree->n.sym->ns != sym->ns)
2916 generate_local_decl (e->symtree->n.sym);
2920 generate_expr_decls (sym, e->value.op.op1);
2921 generate_expr_decls (sym, e->value.op.op2);
2930 for (ref = e->ref; ref; ref = ref->next)
2935 for (i = 0; i < ref->u.ar.dimen; i++)
2937 generate_expr_decls (sym, ref->u.ar.start[i]);
2938 generate_expr_decls (sym, ref->u.ar.end[i]);
2939 generate_expr_decls (sym, ref->u.ar.stride[i]);
2944 generate_expr_decls (sym, ref->u.ss.start);
2945 generate_expr_decls (sym, ref->u.ss.end);
2949 if (ref->u.c.component->ts.type == BT_CHARACTER
2950 && ref->u.c.component->ts.cl->length->expr_type
2952 generate_expr_decls (sym, ref->u.c.component->ts.cl->length);
2954 if (ref->u.c.component->as)
2955 for (i = 0; i < ref->u.c.component->as->rank; i++)
2957 generate_expr_decls (sym, ref->u.c.component->as->lower[i]);
2958 generate_expr_decls (sym, ref->u.c.component->as->upper[i]);
2967 /* Check for dependencies in the character length and array spec. */
2970 generate_dependency_declarations (gfc_symbol *sym)
2974 if (sym->ts.type == BT_CHARACTER
2975 && sym->ts.cl->length->expr_type != EXPR_CONSTANT)
2976 generate_expr_decls (sym, sym->ts.cl->length);
2978 if (sym->as && sym->as->rank)
2980 for (i = 0; i < sym->as->rank; i++)
2982 generate_expr_decls (sym, sym->as->lower[i]);
2983 generate_expr_decls (sym, sym->as->upper[i]);
2989 /* Generate decls for all local variables. We do this to ensure correct
2990 handling of expressions which only appear in the specification of
2994 generate_local_decl (gfc_symbol * sym)
2996 if (sym->attr.flavor == FL_VARIABLE)
2998 /* Check for dependencies in the array specification and string
2999 length, adding the necessary declarations to the function. We
3000 mark the symbol now, as well as in traverse_ns, to prevent
3001 getting stuck in a circular dependency. */
3003 if (!sym->attr.dummy && !sym->ns->proc_name->attr.entry_master)
3004 generate_dependency_declarations (sym);
3006 if (sym->attr.referenced)
3007 gfc_get_symbol_decl (sym);
3008 /* INTENT(out) dummy arguments are likely meant to be set. */
3009 else if (warn_unused_variable
3011 && sym->attr.intent == INTENT_OUT)
3012 gfc_warning ("Dummy argument '%s' at %L was declared INTENT(OUT) but was not set",
3013 sym->name, &sym->declared_at);
3014 /* Specific warning for unused dummy arguments. */
3015 else if (warn_unused_variable && sym->attr.dummy)
3016 gfc_warning ("Unused dummy argument '%s' at %L", sym->name,
3018 /* Warn for unused variables, but not if they're inside a common
3019 block or are use-associated. */
3020 else if (warn_unused_variable
3021 && !(sym->attr.in_common || sym->attr.use_assoc))
3022 gfc_warning ("Unused variable '%s' declared at %L", sym->name,
3024 /* For variable length CHARACTER parameters, the PARM_DECL already
3025 references the length variable, so force gfc_get_symbol_decl
3026 even when not referenced. If optimize > 0, it will be optimized
3027 away anyway. But do this only after emitting -Wunused-parameter
3028 warning if requested. */
3029 if (sym->attr.dummy && ! sym->attr.referenced
3030 && sym->ts.type == BT_CHARACTER
3031 && sym->ts.cl->backend_decl != NULL
3032 && TREE_CODE (sym->ts.cl->backend_decl) == VAR_DECL)
3034 sym->attr.referenced = 1;
3035 gfc_get_symbol_decl (sym);
3038 /* We do not want the middle-end to warn about unused parameters
3039 as this was already done above. */
3040 if (sym->attr.dummy && sym->backend_decl != NULL_TREE)
3041 TREE_NO_WARNING(sym->backend_decl) = 1;
3043 else if (sym->attr.flavor == FL_PARAMETER)
3045 if (warn_unused_parameter
3046 && !sym->attr.referenced
3047 && !sym->attr.use_assoc)
3048 gfc_warning ("Unused parameter '%s' declared at %L", sym->name,
3052 if (sym->attr.dummy == 1)
3054 /* Modify the tree type for scalar character dummy arguments of bind(c)
3055 procedures if they are passed by value. The tree type for them will
3056 be promoted to INTEGER_TYPE for the middle end, which appears to be
3057 what C would do with characters passed by-value. The value attribute
3058 implies the dummy is a scalar. */
3059 if (sym->attr.value == 1 && sym->backend_decl != NULL
3060 && sym->ts.type == BT_CHARACTER && sym->ts.is_c_interop
3061 && sym->ns->proc_name != NULL && sym->ns->proc_name->attr.is_bind_c)
3062 gfc_conv_scalar_char_value (sym, NULL, NULL);
3065 /* Make sure we convert the types of the derived types from iso_c_binding
3067 if (sym->attr.flavor != FL_PROCEDURE && sym->attr.is_iso_c
3068 && sym->ts.type == BT_DERIVED)
3069 sym->backend_decl = gfc_typenode_for_spec (&(sym->ts));
3073 generate_local_vars (gfc_namespace * ns)
3075 gfc_traverse_ns (ns, generate_local_decl);
3079 /* Generate a switch statement to jump to the correct entry point. Also
3080 creates the label decls for the entry points. */
3083 gfc_trans_entry_master_switch (gfc_entry_list * el)
3090 gfc_init_block (&block);
3091 for (; el; el = el->next)
3093 /* Add the case label. */
3094 label = gfc_build_label_decl (NULL_TREE);
3095 val = build_int_cst (gfc_array_index_type, el->id);
3096 tmp = build3_v (CASE_LABEL_EXPR, val, NULL_TREE, label);
3097 gfc_add_expr_to_block (&block, tmp);
3099 /* And jump to the actual entry point. */
3100 label = gfc_build_label_decl (NULL_TREE);
3101 tmp = build1_v (GOTO_EXPR, label);
3102 gfc_add_expr_to_block (&block, tmp);
3104 /* Save the label decl. */
3107 tmp = gfc_finish_block (&block);
3108 /* The first argument selects the entry point. */
3109 val = DECL_ARGUMENTS (current_function_decl);
3110 tmp = build3_v (SWITCH_EXPR, val, tmp, NULL_TREE);
3115 /* Generate code for a function. */
3118 gfc_generate_function_code (gfc_namespace * ns)
3131 sym = ns->proc_name;
3133 /* Check that the frontend isn't still using this. */
3134 gcc_assert (sym->tlink == NULL);
3137 /* Create the declaration for functions with global scope. */
3138 if (!sym->backend_decl)
3139 gfc_create_function_decl (ns);
3141 fndecl = sym->backend_decl;
3142 old_context = current_function_decl;
3146 push_function_context ();
3147 saved_parent_function_decls = saved_function_decls;
3148 saved_function_decls = NULL_TREE;
3151 trans_function_start (sym);
3153 gfc_start_block (&block);
3155 if (ns->entries && ns->proc_name->ts.type == BT_CHARACTER)
3157 /* Copy length backend_decls to all entry point result
3162 gfc_conv_const_charlen (ns->proc_name->ts.cl);
3163 backend_decl = ns->proc_name->result->ts.cl->backend_decl;
3164 for (el = ns->entries; el; el = el->next)
3165 el->sym->result->ts.cl->backend_decl = backend_decl;
3168 /* Translate COMMON blocks. */
3169 gfc_trans_common (ns);
3171 /* Null the parent fake result declaration if this namespace is
3172 a module function or an external procedures. */
3173 if ((ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
3174 || ns->parent == NULL)
3175 parent_fake_result_decl = NULL_TREE;
3177 gfc_generate_contained_functions (ns);
3179 generate_local_vars (ns);
3181 /* Keep the parent fake result declaration in module functions
3182 or external procedures. */
3183 if ((ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
3184 || ns->parent == NULL)
3185 current_fake_result_decl = parent_fake_result_decl;
3187 current_fake_result_decl = NULL_TREE;
3189 current_function_return_label = NULL;
3191 /* Now generate the code for the body of this function. */
3192 gfc_init_block (&body);
3194 /* If this is the main program, add a call to set_options to set up the
3195 runtime library Fortran language standard parameters. */
3196 if (sym->attr.is_main_program)
3198 tree array_type, array, var;
3200 /* Passing a new option to the library requires four modifications:
3201 + add it to the tree_cons list below
3202 + change the array size in the call to build_array_type
3203 + change the first argument to the library call
3204 gfor_fndecl_set_options
3205 + modify the library (runtime/compile_options.c)! */
3206 array = tree_cons (NULL_TREE,
3207 build_int_cst (integer_type_node,
3208 gfc_option.warn_std), NULL_TREE);
3209 array = tree_cons (NULL_TREE,
3210 build_int_cst (integer_type_node,
3211 gfc_option.allow_std), array);
3212 array = tree_cons (NULL_TREE,
3213 build_int_cst (integer_type_node, pedantic), array);
3214 array = tree_cons (NULL_TREE,
3215 build_int_cst (integer_type_node,
3216 gfc_option.flag_dump_core), array);
3217 array = tree_cons (NULL_TREE,
3218 build_int_cst (integer_type_node,
3219 gfc_option.flag_backtrace), array);
3220 array = tree_cons (NULL_TREE,
3221 build_int_cst (integer_type_node,
3222 gfc_option.flag_sign_zero), array);
3224 array = tree_cons (NULL_TREE,
3225 build_int_cst (integer_type_node,
3226 flag_bounds_check), array);
3228 array_type = build_array_type (integer_type_node,
3229 build_index_type (build_int_cst (NULL_TREE,
3231 array = build_constructor_from_list (array_type, nreverse (array));
3232 TREE_CONSTANT (array) = 1;
3233 TREE_INVARIANT (array) = 1;
3234 TREE_STATIC (array) = 1;
3236 /* Create a static variable to hold the jump table. */
3237 var = gfc_create_var (array_type, "options");
3238 TREE_CONSTANT (var) = 1;
3239 TREE_INVARIANT (var) = 1;
3240 TREE_STATIC (var) = 1;
3241 TREE_READONLY (var) = 1;
3242 DECL_INITIAL (var) = array;
3243 var = gfc_build_addr_expr (pvoid_type_node, var);
3245 tmp = build_call_expr (gfor_fndecl_set_options, 2,
3246 build_int_cst (integer_type_node, 7), var);
3247 gfc_add_expr_to_block (&body, tmp);
3250 /* If this is the main program and a -ffpe-trap option was provided,
3251 add a call to set_fpe so that the library will raise a FPE when
3253 if (sym->attr.is_main_program && gfc_option.fpe != 0)
3255 tmp = build_call_expr (gfor_fndecl_set_fpe, 1,
3256 build_int_cst (integer_type_node,
3258 gfc_add_expr_to_block (&body, tmp);
3261 /* If this is the main program and an -fconvert option was provided,
3262 add a call to set_convert. */
3264 if (sym->attr.is_main_program && gfc_option.convert != GFC_CONVERT_NATIVE)
3266 tmp = build_call_expr (gfor_fndecl_set_convert, 1,
3267 build_int_cst (integer_type_node,
3268 gfc_option.convert));
3269 gfc_add_expr_to_block (&body, tmp);
3272 /* If this is the main program and an -frecord-marker option was provided,
3273 add a call to set_record_marker. */
3275 if (sym->attr.is_main_program && gfc_option.record_marker != 0)
3277 tmp = build_call_expr (gfor_fndecl_set_record_marker, 1,
3278 build_int_cst (integer_type_node,
3279 gfc_option.record_marker));
3280 gfc_add_expr_to_block (&body, tmp);
3283 if (sym->attr.is_main_program && gfc_option.max_subrecord_length != 0)
3285 tmp = build_call_expr (gfor_fndecl_set_max_subrecord_length,
3287 build_int_cst (integer_type_node,
3288 gfc_option.max_subrecord_length));
3289 gfc_add_expr_to_block (&body, tmp);
3292 if (TREE_TYPE (DECL_RESULT (fndecl)) != void_type_node
3293 && sym->attr.subroutine)
3295 tree alternate_return;
3296 alternate_return = gfc_get_fake_result_decl (sym, 0);
3297 gfc_add_modify_expr (&body, alternate_return, integer_zero_node);
3302 /* Jump to the correct entry point. */
3303 tmp = gfc_trans_entry_master_switch (ns->entries);
3304 gfc_add_expr_to_block (&body, tmp);
3307 tmp = gfc_trans_code (ns->code);
3308 gfc_add_expr_to_block (&body, tmp);
3310 /* Add a return label if needed. */
3311 if (current_function_return_label)
3313 tmp = build1_v (LABEL_EXPR, current_function_return_label);
3314 gfc_add_expr_to_block (&body, tmp);
3317 tmp = gfc_finish_block (&body);
3318 /* Add code to create and cleanup arrays. */
3319 tmp = gfc_trans_deferred_vars (sym, tmp);
3321 if (TREE_TYPE (DECL_RESULT (fndecl)) != void_type_node)
3323 if (sym->attr.subroutine || sym == sym->result)
3325 if (current_fake_result_decl != NULL)
3326 result = TREE_VALUE (current_fake_result_decl);
3329 current_fake_result_decl = NULL_TREE;
3332 result = sym->result->backend_decl;
3334 if (result != NULL_TREE && sym->attr.function
3335 && sym->ts.type == BT_DERIVED
3336 && sym->ts.derived->attr.alloc_comp
3337 && !sym->attr.pointer)
3339 rank = sym->as ? sym->as->rank : 0;
3340 tmp2 = gfc_nullify_alloc_comp (sym->ts.derived, result, rank);
3341 gfc_add_expr_to_block (&block, tmp2);
3344 gfc_add_expr_to_block (&block, tmp);
3346 if (result == NULL_TREE)
3347 warning (0, "Function return value not set");
3350 /* Set the return value to the dummy result variable. The
3351 types may be different for scalar default REAL functions
3352 with -ff2c, therefore we have to convert. */
3353 tmp = convert (TREE_TYPE (DECL_RESULT (fndecl)), result);
3354 tmp = build2 (MODIFY_EXPR, TREE_TYPE (tmp),
3355 DECL_RESULT (fndecl), tmp);
3356 tmp = build1_v (RETURN_EXPR, tmp);
3357 gfc_add_expr_to_block (&block, tmp);
3361 gfc_add_expr_to_block (&block, tmp);
3364 /* Add all the decls we created during processing. */
3365 decl = saved_function_decls;
3370 next = TREE_CHAIN (decl);
3371 TREE_CHAIN (decl) = NULL_TREE;
3375 saved_function_decls = NULL_TREE;
3377 DECL_SAVED_TREE (fndecl) = gfc_finish_block (&block);
3379 /* Finish off this function and send it for code generation. */
3381 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
3383 /* Output the GENERIC tree. */
3384 dump_function (TDI_original, fndecl);
3386 /* Store the end of the function, so that we get good line number
3387 info for the epilogue. */
3388 cfun->function_end_locus = input_location;
3390 /* We're leaving the context of this function, so zap cfun.
3391 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
3392 tree_rest_of_compilation. */
3397 pop_function_context ();
3398 saved_function_decls = saved_parent_function_decls;
3400 current_function_decl = old_context;
3402 if (decl_function_context (fndecl))
3403 /* Register this function with cgraph just far enough to get it
3404 added to our parent's nested function list. */
3405 (void) cgraph_node (fndecl);
3408 gfc_gimplify_function (fndecl);
3409 cgraph_finalize_function (fndecl, false);
3414 gfc_generate_constructors (void)
3416 gcc_assert (gfc_static_ctors == NULL_TREE);
3424 if (gfc_static_ctors == NULL_TREE)
3427 fnname = get_file_function_name ("I");
3428 type = build_function_type (void_type_node,
3429 gfc_chainon_list (NULL_TREE, void_type_node));
3431 fndecl = build_decl (FUNCTION_DECL, fnname, type);
3432 TREE_PUBLIC (fndecl) = 1;
3434 decl = build_decl (RESULT_DECL, NULL_TREE, void_type_node);
3435 DECL_ARTIFICIAL (decl) = 1;
3436 DECL_IGNORED_P (decl) = 1;
3437 DECL_CONTEXT (decl) = fndecl;
3438 DECL_RESULT (fndecl) = decl;
3442 current_function_decl = fndecl;
3444 rest_of_decl_compilation (fndecl, 1, 0);
3446 make_decl_rtl (fndecl);
3448 init_function_start (fndecl);
3452 for (; gfc_static_ctors; gfc_static_ctors = TREE_CHAIN (gfc_static_ctors))
3454 tmp = build_call_expr (TREE_VALUE (gfc_static_ctors), 0);
3455 DECL_SAVED_TREE (fndecl) = build_stmt (EXPR_STMT, tmp);
3460 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
3462 free_after_parsing (cfun);
3463 free_after_compilation (cfun);
3465 tree_rest_of_compilation (fndecl);
3467 current_function_decl = NULL_TREE;
3471 /* Translates a BLOCK DATA program unit. This means emitting the
3472 commons contained therein plus their initializations. We also emit
3473 a globally visible symbol to make sure that each BLOCK DATA program
3474 unit remains unique. */
3477 gfc_generate_block_data (gfc_namespace * ns)
3482 /* Tell the backend the source location of the block data. */
3484 gfc_set_backend_locus (&ns->proc_name->declared_at);
3486 gfc_set_backend_locus (&gfc_current_locus);
3488 /* Process the DATA statements. */
3489 gfc_trans_common (ns);
3491 /* Create a global symbol with the mane of the block data. This is to
3492 generate linker errors if the same name is used twice. It is never
3495 id = gfc_sym_mangled_function_id (ns->proc_name);
3497 id = get_identifier ("__BLOCK_DATA__");
3499 decl = build_decl (VAR_DECL, id, gfc_array_index_type);
3500 TREE_PUBLIC (decl) = 1;
3501 TREE_STATIC (decl) = 1;
3504 rest_of_decl_compilation (decl, 1, 0);
3508 #include "gt-fortran-trans-decl.h"