1 /* Routines for manipulation of expression nodes.
2 Copyright (C) 2000-2015 Free Software Foundation, Inc.
3 Contributed by Andy Vaught
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
28 #include "target-memory.h" /* for gfc_convert_boz */
29 #include "constructor.h"
32 /* The following set of functions provide access to gfc_expr* of
33 various types - actual all but EXPR_FUNCTION and EXPR_VARIABLE.
35 There are two functions available elsewhere that provide
36 slightly different flavours of variables. Namely:
37 expr.c (gfc_get_variable_expr)
38 symbol.c (gfc_lval_expr_from_sym)
39 TODO: Merge these functions, if possible. */
41 /* Get a new expression node. */
49 gfc_clear_ts (&e->ts);
57 /* Get a new expression node that is an array constructor
58 of given type and kind. */
61 gfc_get_array_expr (bt type, int kind, locus *where)
66 e->expr_type = EXPR_ARRAY;
67 e->value.constructor = NULL;
80 /* Get a new expression node that is the NULL expression. */
83 gfc_get_null_expr (locus *where)
88 e->expr_type = EXPR_NULL;
89 e->ts.type = BT_UNKNOWN;
98 /* Get a new expression node that is an operator expression node. */
101 gfc_get_operator_expr (locus *where, gfc_intrinsic_op op,
102 gfc_expr *op1, gfc_expr *op2)
107 e->expr_type = EXPR_OP;
109 e->value.op.op1 = op1;
110 e->value.op.op2 = op2;
119 /* Get a new expression node that is an structure constructor
120 of given type and kind. */
123 gfc_get_structure_constructor_expr (bt type, int kind, locus *where)
128 e->expr_type = EXPR_STRUCTURE;
129 e->value.constructor = NULL;
140 /* Get a new expression node that is an constant of given type and kind. */
143 gfc_get_constant_expr (bt type, int kind, locus *where)
148 gfc_internal_error ("gfc_get_constant_expr(): locus %<where%> cannot be "
153 e->expr_type = EXPR_CONSTANT;
161 mpz_init (e->value.integer);
165 gfc_set_model_kind (kind);
166 mpfr_init (e->value.real);
170 gfc_set_model_kind (kind);
171 mpc_init2 (e->value.complex, mpfr_get_default_prec());
182 /* Get a new expression node that is an string constant.
183 If no string is passed, a string of len is allocated,
184 blanked and null-terminated. */
187 gfc_get_character_expr (int kind, locus *where, const char *src, int len)
194 dest = gfc_get_wide_string (len + 1);
195 gfc_wide_memset (dest, ' ', len);
199 dest = gfc_char_to_widechar (src);
201 e = gfc_get_constant_expr (BT_CHARACTER, kind,
202 where ? where : &gfc_current_locus);
203 e->value.character.string = dest;
204 e->value.character.length = len;
210 /* Get a new expression node that is an integer constant. */
213 gfc_get_int_expr (int kind, locus *where, int value)
216 p = gfc_get_constant_expr (BT_INTEGER, kind,
217 where ? where : &gfc_current_locus);
219 mpz_set_si (p->value.integer, value);
225 /* Get a new expression node that is a logical constant. */
228 gfc_get_logical_expr (int kind, locus *where, bool value)
231 p = gfc_get_constant_expr (BT_LOGICAL, kind,
232 where ? where : &gfc_current_locus);
234 p->value.logical = value;
241 gfc_get_iokind_expr (locus *where, io_kind k)
245 /* Set the types to something compatible with iokind. This is needed to
246 get through gfc_free_expr later since iokind really has no Basic Type,
250 e->expr_type = EXPR_CONSTANT;
251 e->ts.type = BT_LOGICAL;
259 /* Given an expression pointer, return a copy of the expression. This
260 subroutine is recursive. */
263 gfc_copy_expr (gfc_expr *p)
275 switch (q->expr_type)
278 s = gfc_get_wide_string (p->value.character.length + 1);
279 q->value.character.string = s;
280 memcpy (s, p->value.character.string,
281 (p->value.character.length + 1) * sizeof (gfc_char_t));
285 /* Copy target representation, if it exists. */
286 if (p->representation.string)
288 c = XCNEWVEC (char, p->representation.length + 1);
289 q->representation.string = c;
290 memcpy (c, p->representation.string, (p->representation.length + 1));
293 /* Copy the values of any pointer components of p->value. */
297 mpz_init_set (q->value.integer, p->value.integer);
301 gfc_set_model_kind (q->ts.kind);
302 mpfr_init (q->value.real);
303 mpfr_set (q->value.real, p->value.real, GFC_RND_MODE);
307 gfc_set_model_kind (q->ts.kind);
308 mpc_init2 (q->value.complex, mpfr_get_default_prec());
309 mpc_set (q->value.complex, p->value.complex, GFC_MPC_RND_MODE);
313 if (p->representation.string)
314 q->value.character.string
315 = gfc_char_to_widechar (q->representation.string);
318 s = gfc_get_wide_string (p->value.character.length + 1);
319 q->value.character.string = s;
321 /* This is the case for the C_NULL_CHAR named constant. */
322 if (p->value.character.length == 0
323 && (p->ts.is_c_interop || p->ts.is_iso_c))
326 /* Need to set the length to 1 to make sure the NUL
327 terminator is copied. */
328 q->value.character.length = 1;
331 memcpy (s, p->value.character.string,
332 (p->value.character.length + 1) * sizeof (gfc_char_t));
341 break; /* Already done. */
345 /* Should never be reached. */
347 gfc_internal_error ("gfc_copy_expr(): Bad expr node");
354 switch (q->value.op.op)
357 case INTRINSIC_PARENTHESES:
358 case INTRINSIC_UPLUS:
359 case INTRINSIC_UMINUS:
360 q->value.op.op1 = gfc_copy_expr (p->value.op.op1);
363 default: /* Binary operators. */
364 q->value.op.op1 = gfc_copy_expr (p->value.op.op1);
365 q->value.op.op2 = gfc_copy_expr (p->value.op.op2);
372 q->value.function.actual =
373 gfc_copy_actual_arglist (p->value.function.actual);
378 q->value.compcall.actual =
379 gfc_copy_actual_arglist (p->value.compcall.actual);
380 q->value.compcall.tbp = p->value.compcall.tbp;
385 q->value.constructor = gfc_constructor_copy (p->value.constructor);
393 q->shape = gfc_copy_shape (p->shape, p->rank);
395 q->ref = gfc_copy_ref (p->ref);
402 gfc_clear_shape (mpz_t *shape, int rank)
406 for (i = 0; i < rank; i++)
407 mpz_clear (shape[i]);
412 gfc_free_shape (mpz_t **shape, int rank)
417 gfc_clear_shape (*shape, rank);
423 /* Workhorse function for gfc_free_expr() that frees everything
424 beneath an expression node, but not the node itself. This is
425 useful when we want to simplify a node and replace it with
426 something else or the expression node belongs to another structure. */
429 free_expr0 (gfc_expr *e)
431 switch (e->expr_type)
434 /* Free any parts of the value that need freeing. */
438 mpz_clear (e->value.integer);
442 mpfr_clear (e->value.real);
446 free (e->value.character.string);
450 mpc_clear (e->value.complex);
457 /* Free the representation. */
458 free (e->representation.string);
463 if (e->value.op.op1 != NULL)
464 gfc_free_expr (e->value.op.op1);
465 if (e->value.op.op2 != NULL)
466 gfc_free_expr (e->value.op.op2);
470 gfc_free_actual_arglist (e->value.function.actual);
475 gfc_free_actual_arglist (e->value.compcall.actual);
483 gfc_constructor_free (e->value.constructor);
487 free (e->value.character.string);
494 gfc_internal_error ("free_expr0(): Bad expr type");
497 /* Free a shape array. */
498 gfc_free_shape (&e->shape, e->rank);
500 gfc_free_ref_list (e->ref);
502 memset (e, '\0', sizeof (gfc_expr));
506 /* Free an expression node and everything beneath it. */
509 gfc_free_expr (gfc_expr *e)
518 /* Free an argument list and everything below it. */
521 gfc_free_actual_arglist (gfc_actual_arglist *a1)
523 gfc_actual_arglist *a2;
528 gfc_free_expr (a1->expr);
535 /* Copy an arglist structure and all of the arguments. */
538 gfc_copy_actual_arglist (gfc_actual_arglist *p)
540 gfc_actual_arglist *head, *tail, *new_arg;
544 for (; p; p = p->next)
546 new_arg = gfc_get_actual_arglist ();
549 new_arg->expr = gfc_copy_expr (p->expr);
550 new_arg->next = NULL;
555 tail->next = new_arg;
564 /* Free a list of reference structures. */
567 gfc_free_ref_list (gfc_ref *p)
579 for (i = 0; i < GFC_MAX_DIMENSIONS; i++)
581 gfc_free_expr (p->u.ar.start[i]);
582 gfc_free_expr (p->u.ar.end[i]);
583 gfc_free_expr (p->u.ar.stride[i]);
589 gfc_free_expr (p->u.ss.start);
590 gfc_free_expr (p->u.ss.end);
602 /* Graft the *src expression onto the *dest subexpression. */
605 gfc_replace_expr (gfc_expr *dest, gfc_expr *src)
613 /* Try to extract an integer constant from the passed expression node.
614 Returns an error message or NULL if the result is set. It is
615 tempting to generate an error and return true or false, but
616 failure is OK for some callers. */
619 gfc_extract_int (gfc_expr *expr, int *result)
621 if (expr->expr_type != EXPR_CONSTANT)
622 return _("Constant expression required at %C");
624 if (expr->ts.type != BT_INTEGER)
625 return _("Integer expression required at %C");
627 if ((mpz_cmp_si (expr->value.integer, INT_MAX) > 0)
628 || (mpz_cmp_si (expr->value.integer, INT_MIN) < 0))
630 return _("Integer value too large in expression at %C");
633 *result = (int) mpz_get_si (expr->value.integer);
639 /* Recursively copy a list of reference structures. */
642 gfc_copy_ref (gfc_ref *src)
650 dest = gfc_get_ref ();
651 dest->type = src->type;
656 ar = gfc_copy_array_ref (&src->u.ar);
662 dest->u.c = src->u.c;
666 dest->u.ss = src->u.ss;
667 dest->u.ss.start = gfc_copy_expr (src->u.ss.start);
668 dest->u.ss.end = gfc_copy_expr (src->u.ss.end);
672 dest->next = gfc_copy_ref (src->next);
678 /* Detect whether an expression has any vector index array references. */
681 gfc_has_vector_index (gfc_expr *e)
685 for (ref = e->ref; ref; ref = ref->next)
686 if (ref->type == REF_ARRAY)
687 for (i = 0; i < ref->u.ar.dimen; i++)
688 if (ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
694 /* Copy a shape array. */
697 gfc_copy_shape (mpz_t *shape, int rank)
705 new_shape = gfc_get_shape (rank);
707 for (n = 0; n < rank; n++)
708 mpz_init_set (new_shape[n], shape[n]);
714 /* Copy a shape array excluding dimension N, where N is an integer
715 constant expression. Dimensions are numbered in Fortran style --
718 So, if the original shape array contains R elements
719 { s1 ... sN-1 sN sN+1 ... sR-1 sR}
720 the result contains R-1 elements:
721 { s1 ... sN-1 sN+1 ... sR-1}
723 If anything goes wrong -- N is not a constant, its value is out
724 of range -- or anything else, just returns NULL. */
727 gfc_copy_shape_excluding (mpz_t *shape, int rank, gfc_expr *dim)
729 mpz_t *new_shape, *s;
735 || dim->expr_type != EXPR_CONSTANT
736 || dim->ts.type != BT_INTEGER)
739 n = mpz_get_si (dim->value.integer);
740 n--; /* Convert to zero based index. */
741 if (n < 0 || n >= rank)
744 s = new_shape = gfc_get_shape (rank - 1);
746 for (i = 0; i < rank; i++)
750 mpz_init_set (*s, shape[i]);
758 /* Return the maximum kind of two expressions. In general, higher
759 kind numbers mean more precision for numeric types. */
762 gfc_kind_max (gfc_expr *e1, gfc_expr *e2)
764 return (e1->ts.kind > e2->ts.kind) ? e1->ts.kind : e2->ts.kind;
768 /* Returns nonzero if the type is numeric, zero otherwise. */
771 numeric_type (bt type)
773 return type == BT_COMPLEX || type == BT_REAL || type == BT_INTEGER;
777 /* Returns nonzero if the typespec is a numeric type, zero otherwise. */
780 gfc_numeric_ts (gfc_typespec *ts)
782 return numeric_type (ts->type);
786 /* Return an expression node with an optional argument list attached.
787 A variable number of gfc_expr pointers are strung together in an
788 argument list with a NULL pointer terminating the list. */
791 gfc_build_conversion (gfc_expr *e)
796 p->expr_type = EXPR_FUNCTION;
798 p->value.function.actual = NULL;
800 p->value.function.actual = gfc_get_actual_arglist ();
801 p->value.function.actual->expr = e;
807 /* Given an expression node with some sort of numeric binary
808 expression, insert type conversions required to make the operands
809 have the same type. Conversion warnings are disabled if wconversion
812 The exception is that the operands of an exponential don't have to
813 have the same type. If possible, the base is promoted to the type
814 of the exponent. For example, 1**2.3 becomes 1.0**2.3, but
815 1.0**2 stays as it is. */
818 gfc_type_convert_binary (gfc_expr *e, int wconversion)
822 op1 = e->value.op.op1;
823 op2 = e->value.op.op2;
825 if (op1->ts.type == BT_UNKNOWN || op2->ts.type == BT_UNKNOWN)
827 gfc_clear_ts (&e->ts);
831 /* Kind conversions of same type. */
832 if (op1->ts.type == op2->ts.type)
834 if (op1->ts.kind == op2->ts.kind)
836 /* No type conversions. */
841 if (op1->ts.kind > op2->ts.kind)
842 gfc_convert_type_warn (op2, &op1->ts, 2, wconversion);
844 gfc_convert_type_warn (op1, &op2->ts, 2, wconversion);
850 /* Integer combined with real or complex. */
851 if (op2->ts.type == BT_INTEGER)
855 /* Special case for ** operator. */
856 if (e->value.op.op == INTRINSIC_POWER)
859 gfc_convert_type_warn (e->value.op.op2, &e->ts, 2, wconversion);
863 if (op1->ts.type == BT_INTEGER)
866 gfc_convert_type_warn (e->value.op.op1, &e->ts, 2, wconversion);
870 /* Real combined with complex. */
871 e->ts.type = BT_COMPLEX;
872 if (op1->ts.kind > op2->ts.kind)
873 e->ts.kind = op1->ts.kind;
875 e->ts.kind = op2->ts.kind;
876 if (op1->ts.type != BT_COMPLEX || op1->ts.kind != e->ts.kind)
877 gfc_convert_type_warn (e->value.op.op1, &e->ts, 2, wconversion);
878 if (op2->ts.type != BT_COMPLEX || op2->ts.kind != e->ts.kind)
879 gfc_convert_type_warn (e->value.op.op2, &e->ts, 2, wconversion);
886 /* Function to determine if an expression is constant or not. This
887 function expects that the expression has already been simplified. */
890 gfc_is_constant_expr (gfc_expr *e)
893 gfc_actual_arglist *arg;
899 switch (e->expr_type)
902 return (gfc_is_constant_expr (e->value.op.op1)
903 && (e->value.op.op2 == NULL
904 || gfc_is_constant_expr (e->value.op.op2)));
912 gcc_assert (e->symtree || e->value.function.esym
913 || e->value.function.isym);
915 /* Call to intrinsic with at least one argument. */
916 if (e->value.function.isym && e->value.function.actual)
918 for (arg = e->value.function.actual; arg; arg = arg->next)
919 if (!gfc_is_constant_expr (arg->expr))
923 /* Specification functions are constant. */
924 /* F95, 7.1.6.2; F2003, 7.1.7 */
927 sym = e->symtree->n.sym;
928 if (e->value.function.esym)
929 sym = e->value.function.esym;
932 && sym->attr.function
934 && !sym->attr.intrinsic
935 && !sym->attr.recursive
936 && sym->attr.proc != PROC_INTERNAL
937 && sym->attr.proc != PROC_ST_FUNCTION
938 && sym->attr.proc != PROC_UNKNOWN
939 && gfc_sym_get_dummy_args (sym) == NULL)
942 if (e->value.function.isym
943 && (e->value.function.isym->elemental
944 || e->value.function.isym->pure
945 || e->value.function.isym->inquiry
946 || e->value.function.isym->transformational))
956 return e->ref == NULL || (gfc_is_constant_expr (e->ref->u.ss.start)
957 && gfc_is_constant_expr (e->ref->u.ss.end));
961 c = gfc_constructor_first (e->value.constructor);
962 if ((e->expr_type == EXPR_ARRAY) && c && c->iterator)
963 return gfc_constant_ac (e);
965 for (; c; c = gfc_constructor_next (c))
966 if (!gfc_is_constant_expr (c->expr))
973 gfc_internal_error ("gfc_is_constant_expr(): Unknown expression type");
979 /* Is true if an array reference is followed by a component or substring
982 is_subref_array (gfc_expr * e)
987 if (e->expr_type != EXPR_VARIABLE)
990 if (e->symtree->n.sym->attr.subref_array_pointer)
994 for (ref = e->ref; ref; ref = ref->next)
996 if (ref->type == REF_ARRAY
997 && ref->u.ar.type != AR_ELEMENT)
1001 && ref->type != REF_ARRAY)
1008 /* Try to collapse intrinsic expressions. */
1011 simplify_intrinsic_op (gfc_expr *p, int type)
1013 gfc_intrinsic_op op;
1014 gfc_expr *op1, *op2, *result;
1016 if (p->value.op.op == INTRINSIC_USER)
1019 op1 = p->value.op.op1;
1020 op2 = p->value.op.op2;
1021 op = p->value.op.op;
1023 if (!gfc_simplify_expr (op1, type))
1025 if (!gfc_simplify_expr (op2, type))
1028 if (!gfc_is_constant_expr (op1)
1029 || (op2 != NULL && !gfc_is_constant_expr (op2)))
1033 p->value.op.op1 = NULL;
1034 p->value.op.op2 = NULL;
1038 case INTRINSIC_PARENTHESES:
1039 result = gfc_parentheses (op1);
1042 case INTRINSIC_UPLUS:
1043 result = gfc_uplus (op1);
1046 case INTRINSIC_UMINUS:
1047 result = gfc_uminus (op1);
1050 case INTRINSIC_PLUS:
1051 result = gfc_add (op1, op2);
1054 case INTRINSIC_MINUS:
1055 result = gfc_subtract (op1, op2);
1058 case INTRINSIC_TIMES:
1059 result = gfc_multiply (op1, op2);
1062 case INTRINSIC_DIVIDE:
1063 result = gfc_divide (op1, op2);
1066 case INTRINSIC_POWER:
1067 result = gfc_power (op1, op2);
1070 case INTRINSIC_CONCAT:
1071 result = gfc_concat (op1, op2);
1075 case INTRINSIC_EQ_OS:
1076 result = gfc_eq (op1, op2, op);
1080 case INTRINSIC_NE_OS:
1081 result = gfc_ne (op1, op2, op);
1085 case INTRINSIC_GT_OS:
1086 result = gfc_gt (op1, op2, op);
1090 case INTRINSIC_GE_OS:
1091 result = gfc_ge (op1, op2, op);
1095 case INTRINSIC_LT_OS:
1096 result = gfc_lt (op1, op2, op);
1100 case INTRINSIC_LE_OS:
1101 result = gfc_le (op1, op2, op);
1105 result = gfc_not (op1);
1109 result = gfc_and (op1, op2);
1113 result = gfc_or (op1, op2);
1117 result = gfc_eqv (op1, op2);
1120 case INTRINSIC_NEQV:
1121 result = gfc_neqv (op1, op2);
1125 gfc_internal_error ("simplify_intrinsic_op(): Bad operator");
1130 gfc_free_expr (op1);
1131 gfc_free_expr (op2);
1135 result->rank = p->rank;
1136 result->where = p->where;
1137 gfc_replace_expr (p, result);
1143 /* Subroutine to simplify constructor expressions. Mutually recursive
1144 with gfc_simplify_expr(). */
1147 simplify_constructor (gfc_constructor_base base, int type)
1152 for (c = gfc_constructor_first (base); c; c = gfc_constructor_next (c))
1155 && (!gfc_simplify_expr(c->iterator->start, type)
1156 || !gfc_simplify_expr (c->iterator->end, type)
1157 || !gfc_simplify_expr (c->iterator->step, type)))
1162 /* Try and simplify a copy. Replace the original if successful
1163 but keep going through the constructor at all costs. Not
1164 doing so can make a dog's dinner of complicated things. */
1165 p = gfc_copy_expr (c->expr);
1167 if (!gfc_simplify_expr (p, type))
1173 gfc_replace_expr (c->expr, p);
1181 /* Pull a single array element out of an array constructor. */
1184 find_array_element (gfc_constructor_base base, gfc_array_ref *ar,
1185 gfc_constructor **rval)
1187 unsigned long nelemen;
1193 gfc_constructor *cons;
1200 mpz_init_set_ui (offset, 0);
1203 mpz_init_set_ui (span, 1);
1204 for (i = 0; i < ar->dimen; i++)
1206 if (!gfc_reduce_init_expr (ar->as->lower[i])
1207 || !gfc_reduce_init_expr (ar->as->upper[i]))
1215 if (e->expr_type != EXPR_CONSTANT)
1221 gcc_assert (ar->as->upper[i]->expr_type == EXPR_CONSTANT
1222 && ar->as->lower[i]->expr_type == EXPR_CONSTANT);
1224 /* Check the bounds. */
1225 if ((ar->as->upper[i]
1226 && mpz_cmp (e->value.integer,
1227 ar->as->upper[i]->value.integer) > 0)
1228 || (mpz_cmp (e->value.integer,
1229 ar->as->lower[i]->value.integer) < 0))
1231 gfc_error ("Index in dimension %d is out of bounds "
1232 "at %L", i + 1, &ar->c_where[i]);
1238 mpz_sub (delta, e->value.integer, ar->as->lower[i]->value.integer);
1239 mpz_mul (delta, delta, span);
1240 mpz_add (offset, offset, delta);
1242 mpz_set_ui (tmp, 1);
1243 mpz_add (tmp, tmp, ar->as->upper[i]->value.integer);
1244 mpz_sub (tmp, tmp, ar->as->lower[i]->value.integer);
1245 mpz_mul (span, span, tmp);
1248 for (cons = gfc_constructor_first (base), nelemen = mpz_get_ui (offset);
1249 cons && nelemen > 0; cons = gfc_constructor_next (cons), nelemen--)
1268 /* Find a component of a structure constructor. */
1270 static gfc_constructor *
1271 find_component_ref (gfc_constructor_base base, gfc_ref *ref)
1273 gfc_component *pick = ref->u.c.component;
1274 gfc_constructor *c = gfc_constructor_first (base);
1276 gfc_symbol *dt = ref->u.c.sym;
1277 int ext = dt->attr.extension;
1279 /* For extended types, check if the desired component is in one of the
1281 while (ext > 0 && gfc_find_component (dt->components->ts.u.derived,
1282 pick->name, true, true))
1284 dt = dt->components->ts.u.derived;
1285 c = gfc_constructor_first (c->expr->value.constructor);
1289 gfc_component *comp = dt->components;
1290 while (comp != pick)
1293 c = gfc_constructor_next (c);
1300 /* Replace an expression with the contents of a constructor, removing
1301 the subobject reference in the process. */
1304 remove_subobject_ref (gfc_expr *p, gfc_constructor *cons)
1314 e = gfc_copy_expr (p);
1315 e->ref = p->ref->next;
1316 p->ref->next = NULL;
1317 gfc_replace_expr (p, e);
1321 /* Pull an array section out of an array constructor. */
1324 find_array_section (gfc_expr *expr, gfc_ref *ref)
1331 long unsigned one = 1;
1333 mpz_t start[GFC_MAX_DIMENSIONS];
1334 mpz_t end[GFC_MAX_DIMENSIONS];
1335 mpz_t stride[GFC_MAX_DIMENSIONS];
1336 mpz_t delta[GFC_MAX_DIMENSIONS];
1337 mpz_t ctr[GFC_MAX_DIMENSIONS];
1342 gfc_constructor_base base;
1343 gfc_constructor *cons, *vecsub[GFC_MAX_DIMENSIONS];
1353 base = expr->value.constructor;
1354 expr->value.constructor = NULL;
1356 rank = ref->u.ar.as->rank;
1358 if (expr->shape == NULL)
1359 expr->shape = gfc_get_shape (rank);
1361 mpz_init_set_ui (delta_mpz, one);
1362 mpz_init_set_ui (nelts, one);
1365 /* Do the initialization now, so that we can cleanup without
1366 keeping track of where we were. */
1367 for (d = 0; d < rank; d++)
1369 mpz_init (delta[d]);
1370 mpz_init (start[d]);
1373 mpz_init (stride[d]);
1377 /* Build the counters to clock through the array reference. */
1379 for (d = 0; d < rank; d++)
1381 /* Make this stretch of code easier on the eye! */
1382 begin = ref->u.ar.start[d];
1383 finish = ref->u.ar.end[d];
1384 step = ref->u.ar.stride[d];
1385 lower = ref->u.ar.as->lower[d];
1386 upper = ref->u.ar.as->upper[d];
1388 if (ref->u.ar.dimen_type[d] == DIMEN_VECTOR) /* Vector subscript. */
1390 gfc_constructor *ci;
1393 if (begin->expr_type != EXPR_ARRAY || !gfc_is_constant_expr (begin))
1399 gcc_assert (begin->rank == 1);
1400 /* Zero-sized arrays have no shape and no elements, stop early. */
1403 mpz_init_set_ui (nelts, 0);
1407 vecsub[d] = gfc_constructor_first (begin->value.constructor);
1408 mpz_set (ctr[d], vecsub[d]->expr->value.integer);
1409 mpz_mul (nelts, nelts, begin->shape[0]);
1410 mpz_set (expr->shape[shape_i++], begin->shape[0]);
1413 for (ci = vecsub[d]; ci; ci = gfc_constructor_next (ci))
1415 if (mpz_cmp (ci->expr->value.integer, upper->value.integer) > 0
1416 || mpz_cmp (ci->expr->value.integer,
1417 lower->value.integer) < 0)
1419 gfc_error ("index in dimension %d is out of bounds "
1420 "at %L", d + 1, &ref->u.ar.c_where[d]);
1428 if ((begin && begin->expr_type != EXPR_CONSTANT)
1429 || (finish && finish->expr_type != EXPR_CONSTANT)
1430 || (step && step->expr_type != EXPR_CONSTANT))
1436 /* Obtain the stride. */
1438 mpz_set (stride[d], step->value.integer);
1440 mpz_set_ui (stride[d], one);
1442 if (mpz_cmp_ui (stride[d], 0) == 0)
1443 mpz_set_ui (stride[d], one);
1445 /* Obtain the start value for the index. */
1447 mpz_set (start[d], begin->value.integer);
1449 mpz_set (start[d], lower->value.integer);
1451 mpz_set (ctr[d], start[d]);
1453 /* Obtain the end value for the index. */
1455 mpz_set (end[d], finish->value.integer);
1457 mpz_set (end[d], upper->value.integer);
1459 /* Separate 'if' because elements sometimes arrive with
1461 if (ref->u.ar.dimen_type[d] == DIMEN_ELEMENT)
1462 mpz_set (end [d], begin->value.integer);
1464 /* Check the bounds. */
1465 if (mpz_cmp (ctr[d], upper->value.integer) > 0
1466 || mpz_cmp (end[d], upper->value.integer) > 0
1467 || mpz_cmp (ctr[d], lower->value.integer) < 0
1468 || mpz_cmp (end[d], lower->value.integer) < 0)
1470 gfc_error ("index in dimension %d is out of bounds "
1471 "at %L", d + 1, &ref->u.ar.c_where[d]);
1476 /* Calculate the number of elements and the shape. */
1477 mpz_set (tmp_mpz, stride[d]);
1478 mpz_add (tmp_mpz, end[d], tmp_mpz);
1479 mpz_sub (tmp_mpz, tmp_mpz, ctr[d]);
1480 mpz_div (tmp_mpz, tmp_mpz, stride[d]);
1481 mpz_mul (nelts, nelts, tmp_mpz);
1483 /* An element reference reduces the rank of the expression; don't
1484 add anything to the shape array. */
1485 if (ref->u.ar.dimen_type[d] != DIMEN_ELEMENT)
1486 mpz_set (expr->shape[shape_i++], tmp_mpz);
1489 /* Calculate the 'stride' (=delta) for conversion of the
1490 counter values into the index along the constructor. */
1491 mpz_set (delta[d], delta_mpz);
1492 mpz_sub (tmp_mpz, upper->value.integer, lower->value.integer);
1493 mpz_add_ui (tmp_mpz, tmp_mpz, one);
1494 mpz_mul (delta_mpz, delta_mpz, tmp_mpz);
1498 cons = gfc_constructor_first (base);
1500 /* Now clock through the array reference, calculating the index in
1501 the source constructor and transferring the elements to the new
1503 for (idx = 0; idx < (int) mpz_get_si (nelts); idx++)
1505 mpz_init_set_ui (ptr, 0);
1508 for (d = 0; d < rank; d++)
1510 mpz_set (tmp_mpz, ctr[d]);
1511 mpz_sub (tmp_mpz, tmp_mpz, ref->u.ar.as->lower[d]->value.integer);
1512 mpz_mul (tmp_mpz, tmp_mpz, delta[d]);
1513 mpz_add (ptr, ptr, tmp_mpz);
1515 if (!incr_ctr) continue;
1517 if (ref->u.ar.dimen_type[d] == DIMEN_VECTOR) /* Vector subscript. */
1519 gcc_assert(vecsub[d]);
1521 if (!gfc_constructor_next (vecsub[d]))
1522 vecsub[d] = gfc_constructor_first (ref->u.ar.start[d]->value.constructor);
1525 vecsub[d] = gfc_constructor_next (vecsub[d]);
1528 mpz_set (ctr[d], vecsub[d]->expr->value.integer);
1532 mpz_add (ctr[d], ctr[d], stride[d]);
1534 if (mpz_cmp_ui (stride[d], 0) > 0
1535 ? mpz_cmp (ctr[d], end[d]) > 0
1536 : mpz_cmp (ctr[d], end[d]) < 0)
1537 mpz_set (ctr[d], start[d]);
1543 limit = mpz_get_ui (ptr);
1544 if (limit >= flag_max_array_constructor)
1546 gfc_error ("The number of elements in the array constructor "
1547 "at %L requires an increase of the allowed %d "
1548 "upper limit. See -fmax-array-constructor "
1549 "option", &expr->where, flag_max_array_constructor);
1553 cons = gfc_constructor_lookup (base, limit);
1555 gfc_constructor_append_expr (&expr->value.constructor,
1556 gfc_copy_expr (cons->expr), NULL);
1563 mpz_clear (delta_mpz);
1564 mpz_clear (tmp_mpz);
1566 for (d = 0; d < rank; d++)
1568 mpz_clear (delta[d]);
1569 mpz_clear (start[d]);
1572 mpz_clear (stride[d]);
1574 gfc_constructor_free (base);
1578 /* Pull a substring out of an expression. */
1581 find_substring_ref (gfc_expr *p, gfc_expr **newp)
1588 if (p->ref->u.ss.start->expr_type != EXPR_CONSTANT
1589 || p->ref->u.ss.end->expr_type != EXPR_CONSTANT)
1592 *newp = gfc_copy_expr (p);
1593 free ((*newp)->value.character.string);
1595 end = (int) mpz_get_ui (p->ref->u.ss.end->value.integer);
1596 start = (int) mpz_get_ui (p->ref->u.ss.start->value.integer);
1597 length = end - start + 1;
1599 chr = (*newp)->value.character.string = gfc_get_wide_string (length + 1);
1600 (*newp)->value.character.length = length;
1601 memcpy (chr, &p->value.character.string[start - 1],
1602 length * sizeof (gfc_char_t));
1609 /* Simplify a subobject reference of a constructor. This occurs when
1610 parameter variable values are substituted. */
1613 simplify_const_ref (gfc_expr *p)
1615 gfc_constructor *cons, *c;
1621 switch (p->ref->type)
1624 switch (p->ref->u.ar.type)
1627 /* <type/kind spec>, parameter :: x(<int>) = scalar_expr
1628 will generate this. */
1629 if (p->expr_type != EXPR_ARRAY)
1631 remove_subobject_ref (p, NULL);
1634 if (!find_array_element (p->value.constructor, &p->ref->u.ar, &cons))
1640 remove_subobject_ref (p, cons);
1644 if (!find_array_section (p, p->ref))
1646 p->ref->u.ar.type = AR_FULL;
1651 if (p->ref->next != NULL
1652 && (p->ts.type == BT_CHARACTER || p->ts.type == BT_DERIVED))
1654 for (c = gfc_constructor_first (p->value.constructor);
1655 c; c = gfc_constructor_next (c))
1657 c->expr->ref = gfc_copy_ref (p->ref->next);
1658 if (!simplify_const_ref (c->expr))
1662 if (p->ts.type == BT_DERIVED
1664 && (c = gfc_constructor_first (p->value.constructor)))
1666 /* There may have been component references. */
1667 p->ts = c->expr->ts;
1671 for (; last_ref->next; last_ref = last_ref->next) {};
1673 if (p->ts.type == BT_CHARACTER
1674 && last_ref->type == REF_SUBSTRING)
1676 /* If this is a CHARACTER array and we possibly took
1677 a substring out of it, update the type-spec's
1678 character length according to the first element
1679 (as all should have the same length). */
1681 if ((c = gfc_constructor_first (p->value.constructor)))
1683 const gfc_expr* first = c->expr;
1684 gcc_assert (first->expr_type == EXPR_CONSTANT);
1685 gcc_assert (first->ts.type == BT_CHARACTER);
1686 string_len = first->value.character.length;
1692 p->ts.u.cl = gfc_new_charlen (p->symtree->n.sym->ns,
1695 gfc_free_expr (p->ts.u.cl->length);
1698 = gfc_get_int_expr (gfc_default_integer_kind,
1702 gfc_free_ref_list (p->ref);
1713 cons = find_component_ref (p->value.constructor, p->ref);
1714 remove_subobject_ref (p, cons);
1718 if (!find_substring_ref (p, &newp))
1721 gfc_replace_expr (p, newp);
1722 gfc_free_ref_list (p->ref);
1732 /* Simplify a chain of references. */
1735 simplify_ref_chain (gfc_ref *ref, int type)
1739 for (; ref; ref = ref->next)
1744 for (n = 0; n < ref->u.ar.dimen; n++)
1746 if (!gfc_simplify_expr (ref->u.ar.start[n], type))
1748 if (!gfc_simplify_expr (ref->u.ar.end[n], type))
1750 if (!gfc_simplify_expr (ref->u.ar.stride[n], type))
1756 if (!gfc_simplify_expr (ref->u.ss.start, type))
1758 if (!gfc_simplify_expr (ref->u.ss.end, type))
1770 /* Try to substitute the value of a parameter variable. */
1773 simplify_parameter_variable (gfc_expr *p, int type)
1778 e = gfc_copy_expr (p->symtree->n.sym->value);
1784 /* Do not copy subobject refs for constant. */
1785 if (e->expr_type != EXPR_CONSTANT && p->ref != NULL)
1786 e->ref = gfc_copy_ref (p->ref);
1787 t = gfc_simplify_expr (e, type);
1789 /* Only use the simplification if it eliminated all subobject references. */
1791 gfc_replace_expr (p, e);
1798 /* Given an expression, simplify it by collapsing constant
1799 expressions. Most simplification takes place when the expression
1800 tree is being constructed. If an intrinsic function is simplified
1801 at some point, we get called again to collapse the result against
1804 We work by recursively simplifying expression nodes, simplifying
1805 intrinsic functions where possible, which can lead to further
1806 constant collapsing. If an operator has constant operand(s), we
1807 rip the expression apart, and rebuild it, hoping that it becomes
1810 The expression type is defined for:
1811 0 Basic expression parsing
1812 1 Simplifying array constructors -- will substitute
1814 Returns false on error, true otherwise.
1815 NOTE: Will return true even if the expression can not be simplified. */
1818 gfc_simplify_expr (gfc_expr *p, int type)
1820 gfc_actual_arglist *ap;
1825 switch (p->expr_type)
1832 for (ap = p->value.function.actual; ap; ap = ap->next)
1833 if (!gfc_simplify_expr (ap->expr, type))
1836 if (p->value.function.isym != NULL
1837 && gfc_intrinsic_func_interface (p, 1) == MATCH_ERROR)
1842 case EXPR_SUBSTRING:
1843 if (!simplify_ref_chain (p->ref, type))
1846 if (gfc_is_constant_expr (p))
1852 if (p->ref && p->ref->u.ss.start)
1854 gfc_extract_int (p->ref->u.ss.start, &start);
1855 start--; /* Convert from one-based to zero-based. */
1858 end = p->value.character.length;
1859 if (p->ref && p->ref->u.ss.end)
1860 gfc_extract_int (p->ref->u.ss.end, &end);
1865 s = gfc_get_wide_string (end - start + 2);
1866 memcpy (s, p->value.character.string + start,
1867 (end - start) * sizeof (gfc_char_t));
1868 s[end - start + 1] = '\0'; /* TODO: C-style string. */
1869 free (p->value.character.string);
1870 p->value.character.string = s;
1871 p->value.character.length = end - start;
1872 p->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
1873 p->ts.u.cl->length = gfc_get_int_expr (gfc_default_integer_kind,
1875 p->value.character.length);
1876 gfc_free_ref_list (p->ref);
1878 p->expr_type = EXPR_CONSTANT;
1883 if (!simplify_intrinsic_op (p, type))
1888 /* Only substitute array parameter variables if we are in an
1889 initialization expression, or we want a subsection. */
1890 if (p->symtree->n.sym->attr.flavor == FL_PARAMETER
1891 && (gfc_init_expr_flag || p->ref
1892 || p->symtree->n.sym->value->expr_type != EXPR_ARRAY))
1894 if (!simplify_parameter_variable (p, type))
1901 gfc_simplify_iterator_var (p);
1904 /* Simplify subcomponent references. */
1905 if (!simplify_ref_chain (p->ref, type))
1910 case EXPR_STRUCTURE:
1912 if (!simplify_ref_chain (p->ref, type))
1915 if (!simplify_constructor (p->value.constructor, type))
1918 if (p->expr_type == EXPR_ARRAY && p->ref && p->ref->type == REF_ARRAY
1919 && p->ref->u.ar.type == AR_FULL)
1920 gfc_expand_constructor (p, false);
1922 if (!simplify_const_ref (p))
1936 /* Returns the type of an expression with the exception that iterator
1937 variables are automatically integers no matter what else they may
1943 if (e->expr_type == EXPR_VARIABLE && gfc_check_iter_variable (e))
1950 /* Scalarize an expression for an elemental intrinsic call. */
1953 scalarize_intrinsic_call (gfc_expr *e)
1955 gfc_actual_arglist *a, *b;
1956 gfc_constructor_base ctor;
1957 gfc_constructor *args[5];
1958 gfc_constructor *ci, *new_ctor;
1959 gfc_expr *expr, *old;
1960 int n, i, rank[5], array_arg;
1962 /* Find which, if any, arguments are arrays. Assume that the old
1963 expression carries the type information and that the first arg
1964 that is an array expression carries all the shape information.*/
1966 a = e->value.function.actual;
1967 for (; a; a = a->next)
1970 if (!a->expr || a->expr->expr_type != EXPR_ARRAY)
1973 expr = gfc_copy_expr (a->expr);
1980 old = gfc_copy_expr (e);
1982 gfc_constructor_free (expr->value.constructor);
1983 expr->value.constructor = NULL;
1985 expr->where = old->where;
1986 expr->expr_type = EXPR_ARRAY;
1988 /* Copy the array argument constructors into an array, with nulls
1991 a = old->value.function.actual;
1992 for (; a; a = a->next)
1994 /* Check that this is OK for an initialization expression. */
1995 if (a->expr && !gfc_check_init_expr (a->expr))
1999 if (a->expr && a->expr->rank && a->expr->expr_type == EXPR_VARIABLE)
2001 rank[n] = a->expr->rank;
2002 ctor = a->expr->symtree->n.sym->value->value.constructor;
2003 args[n] = gfc_constructor_first (ctor);
2005 else if (a->expr && a->expr->expr_type == EXPR_ARRAY)
2008 rank[n] = a->expr->rank;
2011 ctor = gfc_constructor_copy (a->expr->value.constructor);
2012 args[n] = gfc_constructor_first (ctor);
2021 /* Using the array argument as the master, step through the array
2022 calling the function for each element and advancing the array
2023 constructors together. */
2024 for (ci = args[array_arg - 1]; ci; ci = gfc_constructor_next (ci))
2026 new_ctor = gfc_constructor_append_expr (&expr->value.constructor,
2027 gfc_copy_expr (old), NULL);
2029 gfc_free_actual_arglist (new_ctor->expr->value.function.actual);
2031 b = old->value.function.actual;
2032 for (i = 0; i < n; i++)
2035 new_ctor->expr->value.function.actual
2036 = a = gfc_get_actual_arglist ();
2039 a->next = gfc_get_actual_arglist ();
2044 a->expr = gfc_copy_expr (args[i]->expr);
2046 a->expr = gfc_copy_expr (b->expr);
2051 /* Simplify the function calls. If the simplification fails, the
2052 error will be flagged up down-stream or the library will deal
2054 gfc_simplify_expr (new_ctor->expr, 0);
2056 for (i = 0; i < n; i++)
2058 args[i] = gfc_constructor_next (args[i]);
2060 for (i = 1; i < n; i++)
2061 if (rank[i] && ((args[i] != NULL && args[array_arg - 1] == NULL)
2062 || (args[i] == NULL && args[array_arg - 1] != NULL)))
2068 /* Free "expr" but not the pointers it contains. */
2070 gfc_free_expr (old);
2074 gfc_error_now ("elemental function arguments at %C are not compliant");
2077 gfc_free_expr (expr);
2078 gfc_free_expr (old);
2084 check_intrinsic_op (gfc_expr *e, bool (*check_function) (gfc_expr *))
2086 gfc_expr *op1 = e->value.op.op1;
2087 gfc_expr *op2 = e->value.op.op2;
2089 if (!(*check_function)(op1))
2092 switch (e->value.op.op)
2094 case INTRINSIC_UPLUS:
2095 case INTRINSIC_UMINUS:
2096 if (!numeric_type (et0 (op1)))
2101 case INTRINSIC_EQ_OS:
2103 case INTRINSIC_NE_OS:
2105 case INTRINSIC_GT_OS:
2107 case INTRINSIC_GE_OS:
2109 case INTRINSIC_LT_OS:
2111 case INTRINSIC_LE_OS:
2112 if (!(*check_function)(op2))
2115 if (!(et0 (op1) == BT_CHARACTER && et0 (op2) == BT_CHARACTER)
2116 && !(numeric_type (et0 (op1)) && numeric_type (et0 (op2))))
2118 gfc_error ("Numeric or CHARACTER operands are required in "
2119 "expression at %L", &e->where);
2124 case INTRINSIC_PLUS:
2125 case INTRINSIC_MINUS:
2126 case INTRINSIC_TIMES:
2127 case INTRINSIC_DIVIDE:
2128 case INTRINSIC_POWER:
2129 if (!(*check_function)(op2))
2132 if (!numeric_type (et0 (op1)) || !numeric_type (et0 (op2)))
2137 case INTRINSIC_CONCAT:
2138 if (!(*check_function)(op2))
2141 if (et0 (op1) != BT_CHARACTER || et0 (op2) != BT_CHARACTER)
2143 gfc_error ("Concatenation operator in expression at %L "
2144 "must have two CHARACTER operands", &op1->where);
2148 if (op1->ts.kind != op2->ts.kind)
2150 gfc_error ("Concat operator at %L must concatenate strings of the "
2151 "same kind", &e->where);
2158 if (et0 (op1) != BT_LOGICAL)
2160 gfc_error (".NOT. operator in expression at %L must have a LOGICAL "
2161 "operand", &op1->where);
2170 case INTRINSIC_NEQV:
2171 if (!(*check_function)(op2))
2174 if (et0 (op1) != BT_LOGICAL || et0 (op2) != BT_LOGICAL)
2176 gfc_error ("LOGICAL operands are required in expression at %L",
2183 case INTRINSIC_PARENTHESES:
2187 gfc_error ("Only intrinsic operators can be used in expression at %L",
2195 gfc_error ("Numeric operands are required in expression at %L", &e->where);
2200 /* F2003, 7.1.7 (3): In init expression, allocatable components
2201 must not be data-initialized. */
2203 check_alloc_comp_init (gfc_expr *e)
2205 gfc_component *comp;
2206 gfc_constructor *ctor;
2208 gcc_assert (e->expr_type == EXPR_STRUCTURE);
2209 gcc_assert (e->ts.type == BT_DERIVED);
2211 for (comp = e->ts.u.derived->components,
2212 ctor = gfc_constructor_first (e->value.constructor);
2213 comp; comp = comp->next, ctor = gfc_constructor_next (ctor))
2215 if (comp->attr.allocatable && ctor->expr
2216 && ctor->expr->expr_type != EXPR_NULL)
2218 gfc_error ("Invalid initialization expression for ALLOCATABLE "
2219 "component %qs in structure constructor at %L",
2220 comp->name, &ctor->expr->where);
2229 check_init_expr_arguments (gfc_expr *e)
2231 gfc_actual_arglist *ap;
2233 for (ap = e->value.function.actual; ap; ap = ap->next)
2234 if (!gfc_check_init_expr (ap->expr))
2240 static bool check_restricted (gfc_expr *);
2242 /* F95, 7.1.6.1, Initialization expressions, (7)
2243 F2003, 7.1.7 Initialization expression, (8) */
2246 check_inquiry (gfc_expr *e, int not_restricted)
2249 const char *const *functions;
2251 static const char *const inquiry_func_f95[] = {
2252 "lbound", "shape", "size", "ubound",
2253 "bit_size", "len", "kind",
2254 "digits", "epsilon", "huge", "maxexponent", "minexponent",
2255 "precision", "radix", "range", "tiny",
2259 static const char *const inquiry_func_f2003[] = {
2260 "lbound", "shape", "size", "ubound",
2261 "bit_size", "len", "kind",
2262 "digits", "epsilon", "huge", "maxexponent", "minexponent",
2263 "precision", "radix", "range", "tiny",
2268 gfc_actual_arglist *ap;
2270 if (!e->value.function.isym
2271 || !e->value.function.isym->inquiry)
2274 /* An undeclared parameter will get us here (PR25018). */
2275 if (e->symtree == NULL)
2278 if (e->symtree->n.sym->from_intmod)
2280 if (e->symtree->n.sym->from_intmod == INTMOD_ISO_FORTRAN_ENV
2281 && e->symtree->n.sym->intmod_sym_id != ISOFORTRAN_COMPILER_OPTIONS
2282 && e->symtree->n.sym->intmod_sym_id != ISOFORTRAN_COMPILER_VERSION)
2285 if (e->symtree->n.sym->from_intmod == INTMOD_ISO_C_BINDING
2286 && e->symtree->n.sym->intmod_sym_id != ISOCBINDING_C_SIZEOF)
2291 name = e->symtree->n.sym->name;
2293 functions = (gfc_option.warn_std & GFC_STD_F2003)
2294 ? inquiry_func_f2003 : inquiry_func_f95;
2296 for (i = 0; functions[i]; i++)
2297 if (strcmp (functions[i], name) == 0)
2300 if (functions[i] == NULL)
2304 /* At this point we have an inquiry function with a variable argument. The
2305 type of the variable might be undefined, but we need it now, because the
2306 arguments of these functions are not allowed to be undefined. */
2308 for (ap = e->value.function.actual; ap; ap = ap->next)
2313 if (ap->expr->ts.type == BT_UNKNOWN)
2315 if (ap->expr->symtree->n.sym->ts.type == BT_UNKNOWN
2316 && !gfc_set_default_type (ap->expr->symtree->n.sym, 0, gfc_current_ns))
2319 ap->expr->ts = ap->expr->symtree->n.sym->ts;
2322 /* Assumed character length will not reduce to a constant expression
2323 with LEN, as required by the standard. */
2324 if (i == 5 && not_restricted
2325 && ap->expr->symtree->n.sym->ts.type == BT_CHARACTER
2326 && (ap->expr->symtree->n.sym->ts.u.cl->length == NULL
2327 || ap->expr->symtree->n.sym->ts.deferred))
2329 gfc_error ("Assumed or deferred character length variable %qs "
2330 " in constant expression at %L",
2331 ap->expr->symtree->n.sym->name,
2335 else if (not_restricted && !gfc_check_init_expr (ap->expr))
2338 if (not_restricted == 0
2339 && ap->expr->expr_type != EXPR_VARIABLE
2340 && !check_restricted (ap->expr))
2343 if (not_restricted == 0
2344 && ap->expr->expr_type == EXPR_VARIABLE
2345 && ap->expr->symtree->n.sym->attr.dummy
2346 && ap->expr->symtree->n.sym->attr.optional)
2354 /* F95, 7.1.6.1, Initialization expressions, (5)
2355 F2003, 7.1.7 Initialization expression, (5) */
2358 check_transformational (gfc_expr *e)
2360 static const char * const trans_func_f95[] = {
2361 "repeat", "reshape", "selected_int_kind",
2362 "selected_real_kind", "transfer", "trim", NULL
2365 static const char * const trans_func_f2003[] = {
2366 "all", "any", "count", "dot_product", "matmul", "null", "pack",
2367 "product", "repeat", "reshape", "selected_char_kind", "selected_int_kind",
2368 "selected_real_kind", "spread", "sum", "transfer", "transpose",
2369 "trim", "unpack", NULL
2374 const char *const *functions;
2376 if (!e->value.function.isym
2377 || !e->value.function.isym->transformational)
2380 name = e->symtree->n.sym->name;
2382 functions = (gfc_option.allow_std & GFC_STD_F2003)
2383 ? trans_func_f2003 : trans_func_f95;
2385 /* NULL() is dealt with below. */
2386 if (strcmp ("null", name) == 0)
2389 for (i = 0; functions[i]; i++)
2390 if (strcmp (functions[i], name) == 0)
2393 if (functions[i] == NULL)
2395 gfc_error ("transformational intrinsic %qs at %L is not permitted "
2396 "in an initialization expression", name, &e->where);
2400 return check_init_expr_arguments (e);
2404 /* F95, 7.1.6.1, Initialization expressions, (6)
2405 F2003, 7.1.7 Initialization expression, (6) */
2408 check_null (gfc_expr *e)
2410 if (strcmp ("null", e->symtree->n.sym->name) != 0)
2413 return check_init_expr_arguments (e);
2418 check_elemental (gfc_expr *e)
2420 if (!e->value.function.isym
2421 || !e->value.function.isym->elemental)
2424 if (e->ts.type != BT_INTEGER
2425 && e->ts.type != BT_CHARACTER
2426 && !gfc_notify_std (GFC_STD_F2003, "Evaluation of nonstandard "
2427 "initialization expression at %L", &e->where))
2430 return check_init_expr_arguments (e);
2435 check_conversion (gfc_expr *e)
2437 if (!e->value.function.isym
2438 || !e->value.function.isym->conversion)
2441 return check_init_expr_arguments (e);
2445 /* Verify that an expression is an initialization expression. A side
2446 effect is that the expression tree is reduced to a single constant
2447 node if all goes well. This would normally happen when the
2448 expression is constructed but function references are assumed to be
2449 intrinsics in the context of initialization expressions. If
2450 false is returned an error message has been generated. */
2453 gfc_check_init_expr (gfc_expr *e)
2461 switch (e->expr_type)
2464 t = check_intrinsic_op (e, gfc_check_init_expr);
2466 t = gfc_simplify_expr (e, 0);
2474 gfc_intrinsic_sym* isym;
2475 gfc_symbol* sym = e->symtree->n.sym;
2477 /* Special case for IEEE_SELECTED_REAL_KIND from the intrinsic
2478 module IEEE_ARITHMETIC, which is allowed in initialization
2480 if (!strcmp(sym->name, "ieee_selected_real_kind")
2481 && sym->from_intmod == INTMOD_IEEE_ARITHMETIC)
2483 gfc_expr *new_expr = gfc_simplify_ieee_selected_real_kind (e);
2486 gfc_replace_expr (e, new_expr);
2492 if (!gfc_is_intrinsic (sym, 0, e->where)
2493 || (m = gfc_intrinsic_func_interface (e, 0)) != MATCH_YES)
2495 gfc_error ("Function %qs in initialization expression at %L "
2496 "must be an intrinsic function",
2497 e->symtree->n.sym->name, &e->where);
2501 if ((m = check_conversion (e)) == MATCH_NO
2502 && (m = check_inquiry (e, 1)) == MATCH_NO
2503 && (m = check_null (e)) == MATCH_NO
2504 && (m = check_transformational (e)) == MATCH_NO
2505 && (m = check_elemental (e)) == MATCH_NO)
2507 gfc_error ("Intrinsic function %qs at %L is not permitted "
2508 "in an initialization expression",
2509 e->symtree->n.sym->name, &e->where);
2513 if (m == MATCH_ERROR)
2516 /* Try to scalarize an elemental intrinsic function that has an
2518 isym = gfc_find_function (e->symtree->n.sym->name);
2519 if (isym && isym->elemental
2520 && (t = scalarize_intrinsic_call(e)))
2525 t = gfc_simplify_expr (e, 0);
2532 if (gfc_check_iter_variable (e))
2535 if (e->symtree->n.sym->attr.flavor == FL_PARAMETER)
2537 /* A PARAMETER shall not be used to define itself, i.e.
2538 REAL, PARAMETER :: x = transfer(0, x)
2540 if (!e->symtree->n.sym->value)
2542 gfc_error ("PARAMETER %qs is used at %L before its definition "
2543 "is complete", e->symtree->n.sym->name, &e->where);
2547 t = simplify_parameter_variable (e, 0);
2552 if (gfc_in_match_data ())
2557 if (e->symtree->n.sym->as)
2559 switch (e->symtree->n.sym->as->type)
2561 case AS_ASSUMED_SIZE:
2562 gfc_error ("Assumed size array %qs at %L is not permitted "
2563 "in an initialization expression",
2564 e->symtree->n.sym->name, &e->where);
2567 case AS_ASSUMED_SHAPE:
2568 gfc_error ("Assumed shape array %qs at %L is not permitted "
2569 "in an initialization expression",
2570 e->symtree->n.sym->name, &e->where);
2574 gfc_error ("Deferred array %qs at %L is not permitted "
2575 "in an initialization expression",
2576 e->symtree->n.sym->name, &e->where);
2580 gfc_error ("Array %qs at %L is a variable, which does "
2581 "not reduce to a constant expression",
2582 e->symtree->n.sym->name, &e->where);
2590 gfc_error ("Parameter %qs at %L has not been declared or is "
2591 "a variable, which does not reduce to a constant "
2592 "expression", e->symtree->n.sym->name, &e->where);
2601 case EXPR_SUBSTRING:
2602 t = gfc_check_init_expr (e->ref->u.ss.start);
2606 t = gfc_check_init_expr (e->ref->u.ss.end);
2608 t = gfc_simplify_expr (e, 0);
2612 case EXPR_STRUCTURE:
2613 t = e->ts.is_iso_c ? true : false;
2617 t = check_alloc_comp_init (e);
2621 t = gfc_check_constructor (e, gfc_check_init_expr);
2628 t = gfc_check_constructor (e, gfc_check_init_expr);
2632 t = gfc_expand_constructor (e, true);
2636 t = gfc_check_constructor_type (e);
2640 gfc_internal_error ("check_init_expr(): Unknown expression type");
2646 /* Reduces a general expression to an initialization expression (a constant).
2647 This used to be part of gfc_match_init_expr.
2648 Note that this function doesn't free the given expression on false. */
2651 gfc_reduce_init_expr (gfc_expr *expr)
2655 gfc_init_expr_flag = true;
2656 t = gfc_resolve_expr (expr);
2658 t = gfc_check_init_expr (expr);
2659 gfc_init_expr_flag = false;
2664 if (expr->expr_type == EXPR_ARRAY)
2666 if (!gfc_check_constructor_type (expr))
2668 if (!gfc_expand_constructor (expr, true))
2676 /* Match an initialization expression. We work by first matching an
2677 expression, then reducing it to a constant. */
2680 gfc_match_init_expr (gfc_expr **result)
2688 gfc_init_expr_flag = true;
2690 m = gfc_match_expr (&expr);
2693 gfc_init_expr_flag = false;
2697 t = gfc_reduce_init_expr (expr);
2700 gfc_free_expr (expr);
2701 gfc_init_expr_flag = false;
2706 gfc_init_expr_flag = false;
2712 /* Given an actual argument list, test to see that each argument is a
2713 restricted expression and optionally if the expression type is
2714 integer or character. */
2717 restricted_args (gfc_actual_arglist *a)
2719 for (; a; a = a->next)
2721 if (!check_restricted (a->expr))
2729 /************* Restricted/specification expressions *************/
2732 /* Make sure a non-intrinsic function is a specification function. */
2735 external_spec_function (gfc_expr *e)
2739 f = e->value.function.esym;
2741 if (f->attr.proc == PROC_ST_FUNCTION)
2743 gfc_error ("Specification function %qs at %L cannot be a statement "
2744 "function", f->name, &e->where);
2748 if (f->attr.proc == PROC_INTERNAL)
2750 gfc_error ("Specification function %qs at %L cannot be an internal "
2751 "function", f->name, &e->where);
2755 if (!f->attr.pure && !f->attr.elemental)
2757 gfc_error ("Specification function %qs at %L must be PURE", f->name,
2762 if (f->attr.recursive)
2764 gfc_error ("Specification function %qs at %L cannot be RECURSIVE",
2765 f->name, &e->where);
2769 return restricted_args (e->value.function.actual);
2773 /* Check to see that a function reference to an intrinsic is a
2774 restricted expression. */
2777 restricted_intrinsic (gfc_expr *e)
2779 /* TODO: Check constraints on inquiry functions. 7.1.6.2 (7). */
2780 if (check_inquiry (e, 0) == MATCH_YES)
2783 return restricted_args (e->value.function.actual);
2787 /* Check the expressions of an actual arglist. Used by check_restricted. */
2790 check_arglist (gfc_actual_arglist* arg, bool (*checker) (gfc_expr*))
2792 for (; arg; arg = arg->next)
2793 if (!checker (arg->expr))
2800 /* Check the subscription expressions of a reference chain with a checking
2801 function; used by check_restricted. */
2804 check_references (gfc_ref* ref, bool (*checker) (gfc_expr*))
2814 for (dim = 0; dim != ref->u.ar.dimen; ++dim)
2816 if (!checker (ref->u.ar.start[dim]))
2818 if (!checker (ref->u.ar.end[dim]))
2820 if (!checker (ref->u.ar.stride[dim]))
2826 /* Nothing needed, just proceed to next reference. */
2830 if (!checker (ref->u.ss.start))
2832 if (!checker (ref->u.ss.end))
2841 return check_references (ref->next, checker);
2845 /* Verify that an expression is a restricted expression. Like its
2846 cousin check_init_expr(), an error message is generated if we
2850 check_restricted (gfc_expr *e)
2858 switch (e->expr_type)
2861 t = check_intrinsic_op (e, check_restricted);
2863 t = gfc_simplify_expr (e, 0);
2868 if (e->value.function.esym)
2870 t = check_arglist (e->value.function.actual, &check_restricted);
2872 t = external_spec_function (e);
2876 if (e->value.function.isym && e->value.function.isym->inquiry)
2879 t = check_arglist (e->value.function.actual, &check_restricted);
2882 t = restricted_intrinsic (e);
2887 sym = e->symtree->n.sym;
2890 /* If a dummy argument appears in a context that is valid for a
2891 restricted expression in an elemental procedure, it will have
2892 already been simplified away once we get here. Therefore we
2893 don't need to jump through hoops to distinguish valid from
2895 if (sym->attr.dummy && sym->ns == gfc_current_ns
2896 && sym->ns->proc_name && sym->ns->proc_name->attr.elemental)
2898 gfc_error ("Dummy argument %qs not allowed in expression at %L",
2899 sym->name, &e->where);
2903 if (sym->attr.optional)
2905 gfc_error ("Dummy argument %qs at %L cannot be OPTIONAL",
2906 sym->name, &e->where);
2910 if (sym->attr.intent == INTENT_OUT)
2912 gfc_error ("Dummy argument %qs at %L cannot be INTENT(OUT)",
2913 sym->name, &e->where);
2917 /* Check reference chain if any. */
2918 if (!check_references (e->ref, &check_restricted))
2921 /* gfc_is_formal_arg broadcasts that a formal argument list is being
2922 processed in resolve.c(resolve_formal_arglist). This is done so
2923 that host associated dummy array indices are accepted (PR23446).
2924 This mechanism also does the same for the specification expressions
2925 of array-valued functions. */
2927 || sym->attr.in_common
2928 || sym->attr.use_assoc
2930 || sym->attr.implied_index
2931 || sym->attr.flavor == FL_PARAMETER
2932 || (sym->ns && sym->ns == gfc_current_ns->parent)
2933 || (sym->ns && gfc_current_ns->parent
2934 && sym->ns == gfc_current_ns->parent->parent)
2935 || (sym->ns->proc_name != NULL
2936 && sym->ns->proc_name->attr.flavor == FL_MODULE)
2937 || (gfc_is_formal_arg () && (sym->ns == gfc_current_ns)))
2943 gfc_error ("Variable %qs cannot appear in the expression at %L",
2944 sym->name, &e->where);
2945 /* Prevent a repetition of the error. */
2954 case EXPR_SUBSTRING:
2955 t = gfc_specification_expr (e->ref->u.ss.start);
2959 t = gfc_specification_expr (e->ref->u.ss.end);
2961 t = gfc_simplify_expr (e, 0);
2965 case EXPR_STRUCTURE:
2966 t = gfc_check_constructor (e, check_restricted);
2970 t = gfc_check_constructor (e, check_restricted);
2974 gfc_internal_error ("check_restricted(): Unknown expression type");
2981 /* Check to see that an expression is a specification expression. If
2982 we return false, an error has been generated. */
2985 gfc_specification_expr (gfc_expr *e)
2987 gfc_component *comp;
2992 if (e->ts.type != BT_INTEGER)
2994 gfc_error ("Expression at %L must be of INTEGER type, found %s",
2995 &e->where, gfc_basic_typename (e->ts.type));
2999 comp = gfc_get_proc_ptr_comp (e);
3000 if (e->expr_type == EXPR_FUNCTION
3001 && !e->value.function.isym
3002 && !e->value.function.esym
3003 && !gfc_pure (e->symtree->n.sym)
3004 && (!comp || !comp->attr.pure))
3006 gfc_error ("Function %qs at %L must be PURE",
3007 e->symtree->n.sym->name, &e->where);
3008 /* Prevent repeat error messages. */
3009 e->symtree->n.sym->attr.pure = 1;
3015 gfc_error ("Expression at %L must be scalar", &e->where);
3019 if (!gfc_simplify_expr (e, 0))
3022 return check_restricted (e);
3026 /************** Expression conformance checks. *************/
3028 /* Given two expressions, make sure that the arrays are conformable. */
3031 gfc_check_conformance (gfc_expr *op1, gfc_expr *op2, const char *optype_msgid, ...)
3033 int op1_flag, op2_flag, d;
3034 mpz_t op1_size, op2_size;
3040 if (op1->rank == 0 || op2->rank == 0)
3043 va_start (argp, optype_msgid);
3044 vsnprintf (buffer, 240, optype_msgid, argp);
3047 if (op1->rank != op2->rank)
3049 gfc_error ("Incompatible ranks in %s (%d and %d) at %L", _(buffer),
3050 op1->rank, op2->rank, &op1->where);
3056 for (d = 0; d < op1->rank; d++)
3058 op1_flag = gfc_array_dimen_size(op1, d, &op1_size);
3059 op2_flag = gfc_array_dimen_size(op2, d, &op2_size);
3061 if (op1_flag && op2_flag && mpz_cmp (op1_size, op2_size) != 0)
3063 gfc_error ("Different shape for %s at %L on dimension %d "
3064 "(%d and %d)", _(buffer), &op1->where, d + 1,
3065 (int) mpz_get_si (op1_size),
3066 (int) mpz_get_si (op2_size));
3072 mpz_clear (op1_size);
3074 mpz_clear (op2_size);
3084 /* Given an assignable expression and an arbitrary expression, make
3085 sure that the assignment can take place. */
3088 gfc_check_assign (gfc_expr *lvalue, gfc_expr *rvalue, int conform)
3094 sym = lvalue->symtree->n.sym;
3096 /* See if this is the component or subcomponent of a pointer. */
3097 has_pointer = sym->attr.pointer;
3098 for (ref = lvalue->ref; ref; ref = ref->next)
3099 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
3105 /* 12.5.2.2, Note 12.26: The result variable is very similar to any other
3106 variable local to a function subprogram. Its existence begins when
3107 execution of the function is initiated and ends when execution of the
3108 function is terminated...
3109 Therefore, the left hand side is no longer a variable, when it is: */
3110 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_ST_FUNCTION
3111 && !sym->attr.external)
3116 /* (i) Use associated; */
3117 if (sym->attr.use_assoc)
3120 /* (ii) The assignment is in the main program; or */
3121 if (gfc_current_ns->proc_name->attr.is_main_program)
3124 /* (iii) A module or internal procedure... */
3125 if ((gfc_current_ns->proc_name->attr.proc == PROC_INTERNAL
3126 || gfc_current_ns->proc_name->attr.proc == PROC_MODULE)
3127 && gfc_current_ns->parent
3128 && (!(gfc_current_ns->parent->proc_name->attr.function
3129 || gfc_current_ns->parent->proc_name->attr.subroutine)
3130 || gfc_current_ns->parent->proc_name->attr.is_main_program))
3132 /* ... that is not a function... */
3133 if (!gfc_current_ns->proc_name->attr.function)
3136 /* ... or is not an entry and has a different name. */
3137 if (!sym->attr.entry && sym->name != gfc_current_ns->proc_name->name)
3141 /* (iv) Host associated and not the function symbol or the
3142 parent result. This picks up sibling references, which
3143 cannot be entries. */
3144 if (!sym->attr.entry
3145 && sym->ns == gfc_current_ns->parent
3146 && sym != gfc_current_ns->proc_name
3147 && sym != gfc_current_ns->parent->proc_name->result)
3152 gfc_error ("%qs at %L is not a VALUE", sym->name, &lvalue->where);
3157 if (rvalue->rank != 0 && lvalue->rank != rvalue->rank)
3159 gfc_error ("Incompatible ranks %d and %d in assignment at %L",
3160 lvalue->rank, rvalue->rank, &lvalue->where);
3164 if (lvalue->ts.type == BT_UNKNOWN)
3166 gfc_error ("Variable type is UNKNOWN in assignment at %L",
3171 if (rvalue->expr_type == EXPR_NULL)
3173 if (has_pointer && (ref == NULL || ref->next == NULL)
3174 && lvalue->symtree->n.sym->attr.data)
3178 gfc_error ("NULL appears on right-hand side in assignment at %L",
3184 /* This is possibly a typo: x = f() instead of x => f(). */
3186 && rvalue->expr_type == EXPR_FUNCTION && gfc_expr_attr (rvalue).pointer)
3187 gfc_warning (OPT_Wsurprising,
3188 "POINTER-valued function appears on right-hand side of "
3189 "assignment at %L", &rvalue->where);
3191 /* Check size of array assignments. */
3192 if (lvalue->rank != 0 && rvalue->rank != 0
3193 && !gfc_check_conformance (lvalue, rvalue, "array assignment"))
3196 if (rvalue->is_boz && lvalue->ts.type != BT_INTEGER
3197 && lvalue->symtree->n.sym->attr.data
3198 && !gfc_notify_std (GFC_STD_GNU, "BOZ literal at %L used to "
3199 "initialize non-integer variable %qs",
3200 &rvalue->where, lvalue->symtree->n.sym->name))
3202 else if (rvalue->is_boz && !lvalue->symtree->n.sym->attr.data
3203 && !gfc_notify_std (GFC_STD_GNU, "BOZ literal at %L outside "
3204 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
3208 /* Handle the case of a BOZ literal on the RHS. */
3209 if (rvalue->is_boz && lvalue->ts.type != BT_INTEGER)
3212 if (warn_surprising)
3213 gfc_warning (OPT_Wsurprising,
3214 "BOZ literal at %L is bitwise transferred "
3215 "non-integer symbol %qs", &rvalue->where,
3216 lvalue->symtree->n.sym->name);
3217 if (!gfc_convert_boz (rvalue, &lvalue->ts))
3219 if ((rc = gfc_range_check (rvalue)) != ARITH_OK)
3221 if (rc == ARITH_UNDERFLOW)
3222 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
3223 ". This check can be disabled with the option "
3224 "%<-fno-range-check%>", &rvalue->where);
3225 else if (rc == ARITH_OVERFLOW)
3226 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
3227 ". This check can be disabled with the option "
3228 "%<-fno-range-check%>", &rvalue->where);
3229 else if (rc == ARITH_NAN)
3230 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
3231 ". This check can be disabled with the option "
3232 "%<-fno-range-check%>", &rvalue->where);
3237 /* Warn about type-changing conversions for REAL or COMPLEX constants.
3238 If lvalue and rvalue are mixed REAL and complex, gfc_compare_types
3239 will warn anyway, so there is no need to to so here. */
3241 if (rvalue->expr_type == EXPR_CONSTANT && lvalue->ts.type == rvalue->ts.type
3242 && (lvalue->ts.type == BT_REAL || lvalue->ts.type == BT_COMPLEX))
3244 if (lvalue->ts.kind < rvalue->ts.kind && warn_conversion)
3246 /* As a special bonus, don't warn about REAL rvalues which are not
3247 changed by the conversion if -Wconversion is specified. */
3248 if (rvalue->ts.type == BT_REAL && mpfr_number_p (rvalue->value.real))
3250 /* Calculate the difference between the constant and the rounded
3251 value and check it against zero. */
3253 gfc_set_model_kind (lvalue->ts.kind);
3255 gfc_set_model_kind (rvalue->ts.kind);
3258 mpfr_set (rv, rvalue->value.real, GFC_RND_MODE);
3259 mpfr_sub (diff, rv, rvalue->value.real, GFC_RND_MODE);
3261 if (!mpfr_zero_p (diff))
3262 gfc_warning (OPT_Wconversion,
3263 "Change of value in conversion from "
3264 " %qs to %qs at %L", gfc_typename (&rvalue->ts),
3265 gfc_typename (&lvalue->ts), &rvalue->where);
3271 gfc_warning (OPT_Wconversion,
3272 "Possible change of value in conversion from %qs "
3273 "to %qs at %L", gfc_typename (&rvalue->ts),
3274 gfc_typename (&lvalue->ts), &rvalue->where);
3277 else if (warn_conversion_extra && lvalue->ts.kind > rvalue->ts.kind)
3279 gfc_warning (OPT_Wconversion_extra,
3280 "Conversion from %qs to %qs at %L",
3281 gfc_typename (&rvalue->ts),
3282 gfc_typename (&lvalue->ts), &rvalue->where);
3286 if (gfc_compare_types (&lvalue->ts, &rvalue->ts))
3289 /* Only DATA Statements come here. */
3292 /* Numeric can be converted to any other numeric. And Hollerith can be
3293 converted to any other type. */
3294 if ((gfc_numeric_ts (&lvalue->ts) && gfc_numeric_ts (&rvalue->ts))
3295 || rvalue->ts.type == BT_HOLLERITH)
3298 if (lvalue->ts.type == BT_LOGICAL && rvalue->ts.type == BT_LOGICAL)
3301 gfc_error ("Incompatible types in DATA statement at %L; attempted "
3302 "conversion of %s to %s", &lvalue->where,
3303 gfc_typename (&rvalue->ts), gfc_typename (&lvalue->ts));
3308 /* Assignment is the only case where character variables of different
3309 kind values can be converted into one another. */
3310 if (lvalue->ts.type == BT_CHARACTER && rvalue->ts.type == BT_CHARACTER)
3312 if (lvalue->ts.kind != rvalue->ts.kind)
3313 gfc_convert_chartype (rvalue, &lvalue->ts);
3318 return gfc_convert_type (rvalue, &lvalue->ts, 1);
3322 /* Check that a pointer assignment is OK. We first check lvalue, and
3323 we only check rvalue if it's not an assignment to NULL() or a
3324 NULLIFY statement. */
3327 gfc_check_pointer_assign (gfc_expr *lvalue, gfc_expr *rvalue)
3329 symbol_attribute attr, lhs_attr;
3331 bool is_pure, is_implicit_pure, rank_remap;
3334 lhs_attr = gfc_expr_attr (lvalue);
3335 if (lvalue->ts.type == BT_UNKNOWN && !lhs_attr.proc_pointer)
3337 gfc_error ("Pointer assignment target is not a POINTER at %L",
3342 if (lhs_attr.flavor == FL_PROCEDURE && lhs_attr.use_assoc
3343 && !lhs_attr.proc_pointer)
3345 gfc_error ("%qs in the pointer assignment at %L cannot be an "
3346 "l-value since it is a procedure",
3347 lvalue->symtree->n.sym->name, &lvalue->where);
3351 proc_pointer = lvalue->symtree->n.sym->attr.proc_pointer;
3354 for (ref = lvalue->ref; ref; ref = ref->next)
3356 if (ref->type == REF_COMPONENT)
3357 proc_pointer = ref->u.c.component->attr.proc_pointer;
3359 if (ref->type == REF_ARRAY && ref->next == NULL)
3363 if (ref->u.ar.type == AR_FULL)
3366 if (ref->u.ar.type != AR_SECTION)
3368 gfc_error ("Expected bounds specification for %qs at %L",
3369 lvalue->symtree->n.sym->name, &lvalue->where);
3373 if (!gfc_notify_std (GFC_STD_F2003, "Bounds specification "
3374 "for %qs in pointer assignment at %L",
3375 lvalue->symtree->n.sym->name, &lvalue->where))
3378 /* When bounds are given, all lbounds are necessary and either all
3379 or none of the upper bounds; no strides are allowed. If the
3380 upper bounds are present, we may do rank remapping. */
3381 for (dim = 0; dim < ref->u.ar.dimen; ++dim)
3383 if (!ref->u.ar.start[dim]
3384 || ref->u.ar.dimen_type[dim] != DIMEN_RANGE)
3386 gfc_error ("Lower bound has to be present at %L",
3390 if (ref->u.ar.stride[dim])
3392 gfc_error ("Stride must not be present at %L",
3398 rank_remap = (ref->u.ar.end[dim] != NULL);
3401 if ((rank_remap && !ref->u.ar.end[dim])
3402 || (!rank_remap && ref->u.ar.end[dim]))
3404 gfc_error ("Either all or none of the upper bounds"
3405 " must be specified at %L", &lvalue->where);
3413 is_pure = gfc_pure (NULL);
3414 is_implicit_pure = gfc_implicit_pure (NULL);
3416 /* If rvalue is a NULL() or NULLIFY, we're done. Otherwise the type,
3417 kind, etc for lvalue and rvalue must match, and rvalue must be a
3418 pure variable if we're in a pure function. */
3419 if (rvalue->expr_type == EXPR_NULL && rvalue->ts.type == BT_UNKNOWN)
3422 /* F2008, C723 (pointer) and C726 (proc-pointer); for PURE also C1283. */
3423 if (lvalue->expr_type == EXPR_VARIABLE
3424 && gfc_is_coindexed (lvalue))
3427 for (ref = lvalue->ref; ref; ref = ref->next)
3428 if (ref->type == REF_ARRAY && ref->u.ar.codimen)
3430 gfc_error ("Pointer object at %L shall not have a coindex",
3436 /* Checks on rvalue for procedure pointer assignments. */
3441 gfc_component *comp;
3444 attr = gfc_expr_attr (rvalue);
3445 if (!((rvalue->expr_type == EXPR_NULL)
3446 || (rvalue->expr_type == EXPR_FUNCTION && attr.proc_pointer)
3447 || (rvalue->expr_type == EXPR_VARIABLE && attr.proc_pointer)
3448 || (rvalue->expr_type == EXPR_VARIABLE
3449 && attr.flavor == FL_PROCEDURE)))
3451 gfc_error ("Invalid procedure pointer assignment at %L",
3455 if (rvalue->expr_type == EXPR_VARIABLE && !attr.proc_pointer)
3457 /* Check for intrinsics. */
3458 gfc_symbol *sym = rvalue->symtree->n.sym;
3459 if (!sym->attr.intrinsic
3460 && (gfc_is_intrinsic (sym, 0, sym->declared_at)
3461 || gfc_is_intrinsic (sym, 1, sym->declared_at)))
3463 sym->attr.intrinsic = 1;
3464 gfc_resolve_intrinsic (sym, &rvalue->where);
3465 attr = gfc_expr_attr (rvalue);
3467 /* Check for result of embracing function. */
3468 if (sym->attr.function && sym->result == sym)
3472 for (ns = gfc_current_ns; ns; ns = ns->parent)
3473 if (sym == ns->proc_name)
3475 gfc_error ("Function result %qs is invalid as proc-target "
3476 "in procedure pointer assignment at %L",
3477 sym->name, &rvalue->where);
3484 gfc_error ("Abstract interface %qs is invalid "
3485 "in procedure pointer assignment at %L",
3486 rvalue->symtree->name, &rvalue->where);
3489 /* Check for F08:C729. */
3490 if (attr.flavor == FL_PROCEDURE)
3492 if (attr.proc == PROC_ST_FUNCTION)
3494 gfc_error ("Statement function %qs is invalid "
3495 "in procedure pointer assignment at %L",
3496 rvalue->symtree->name, &rvalue->where);
3499 if (attr.proc == PROC_INTERNAL &&
3500 !gfc_notify_std(GFC_STD_F2008, "Internal procedure %qs "
3501 "is invalid in procedure pointer assignment "
3502 "at %L", rvalue->symtree->name, &rvalue->where))
3504 if (attr.intrinsic && gfc_intrinsic_actual_ok (rvalue->symtree->name,
3505 attr.subroutine) == 0)
3507 gfc_error ("Intrinsic %qs at %L is invalid in procedure pointer "
3508 "assignment", rvalue->symtree->name, &rvalue->where);
3512 /* Check for F08:C730. */
3513 if (attr.elemental && !attr.intrinsic)
3515 gfc_error ("Nonintrinsic elemental procedure %qs is invalid "
3516 "in procedure pointer assignment at %L",
3517 rvalue->symtree->name, &rvalue->where);
3521 /* Ensure that the calling convention is the same. As other attributes
3522 such as DLLEXPORT may differ, one explicitly only tests for the
3523 calling conventions. */
3524 if (rvalue->expr_type == EXPR_VARIABLE
3525 && lvalue->symtree->n.sym->attr.ext_attr
3526 != rvalue->symtree->n.sym->attr.ext_attr)
3528 symbol_attribute calls;
3531 gfc_add_ext_attribute (&calls, EXT_ATTR_CDECL, NULL);
3532 gfc_add_ext_attribute (&calls, EXT_ATTR_STDCALL, NULL);
3533 gfc_add_ext_attribute (&calls, EXT_ATTR_FASTCALL, NULL);
3535 if ((calls.ext_attr & lvalue->symtree->n.sym->attr.ext_attr)
3536 != (calls.ext_attr & rvalue->symtree->n.sym->attr.ext_attr))
3538 gfc_error ("Mismatch in the procedure pointer assignment "
3539 "at %L: mismatch in the calling convention",
3545 comp = gfc_get_proc_ptr_comp (lvalue);
3547 s1 = comp->ts.interface;
3550 s1 = lvalue->symtree->n.sym;
3551 if (s1->ts.interface)
3552 s1 = s1->ts.interface;
3555 comp = gfc_get_proc_ptr_comp (rvalue);
3558 if (rvalue->expr_type == EXPR_FUNCTION)
3560 s2 = comp->ts.interface->result;
3565 s2 = comp->ts.interface;
3569 else if (rvalue->expr_type == EXPR_FUNCTION)
3571 if (rvalue->value.function.esym)
3572 s2 = rvalue->value.function.esym->result;
3574 s2 = rvalue->symtree->n.sym->result;
3580 s2 = rvalue->symtree->n.sym;
3584 if (s2 && s2->attr.proc_pointer && s2->ts.interface)
3585 s2 = s2->ts.interface;
3587 if (s1 == s2 || !s1 || !s2)
3590 /* F08:7.2.2.4 (4) */
3591 if (s1->attr.if_source == IFSRC_UNKNOWN
3592 && gfc_explicit_interface_required (s2, err, sizeof(err)))
3594 gfc_error ("Explicit interface required for %qs at %L: %s",
3595 s1->name, &lvalue->where, err);
3598 if (s2->attr.if_source == IFSRC_UNKNOWN
3599 && gfc_explicit_interface_required (s1, err, sizeof(err)))
3601 gfc_error ("Explicit interface required for %qs at %L: %s",
3602 s2->name, &rvalue->where, err);
3606 if (!gfc_compare_interfaces (s1, s2, name, 0, 1,
3607 err, sizeof(err), NULL, NULL))
3609 gfc_error ("Interface mismatch in procedure pointer assignment "
3610 "at %L: %s", &rvalue->where, err);
3614 /* Check F2008Cor2, C729. */
3615 if (!s2->attr.intrinsic && s2->attr.if_source == IFSRC_UNKNOWN
3616 && !s2->attr.external && !s2->attr.subroutine && !s2->attr.function)
3618 gfc_error ("Procedure pointer target %qs at %L must be either an "
3619 "intrinsic, host or use associated, referenced or have "
3620 "the EXTERNAL attribute", s2->name, &rvalue->where);
3627 if (!gfc_compare_types (&lvalue->ts, &rvalue->ts))
3629 /* Check for F03:C717. */
3630 if (UNLIMITED_POLY (rvalue)
3631 && !(UNLIMITED_POLY (lvalue)
3632 || (lvalue->ts.type == BT_DERIVED
3633 && (lvalue->ts.u.derived->attr.is_bind_c
3634 || lvalue->ts.u.derived->attr.sequence))))
3635 gfc_error ("Data-pointer-object &L must be unlimited "
3636 "polymorphic, a sequence derived type or of a "
3637 "type with the BIND attribute assignment at %L "
3638 "to be compatible with an unlimited polymorphic "
3639 "target", &lvalue->where);
3641 gfc_error ("Different types in pointer assignment at %L; "
3642 "attempted assignment of %s to %s", &lvalue->where,
3643 gfc_typename (&rvalue->ts),
3644 gfc_typename (&lvalue->ts));
3648 if (lvalue->ts.type != BT_CLASS && lvalue->ts.kind != rvalue->ts.kind)
3650 gfc_error ("Different kind type parameters in pointer "
3651 "assignment at %L", &lvalue->where);
3655 if (lvalue->rank != rvalue->rank && !rank_remap)
3657 gfc_error ("Different ranks in pointer assignment at %L", &lvalue->where);
3661 /* Make sure the vtab is present. */
3662 if (lvalue->ts.type == BT_CLASS && !UNLIMITED_POLY (rvalue))
3663 gfc_find_vtab (&rvalue->ts);
3665 /* Check rank remapping. */
3670 /* If this can be determined, check that the target must be at least as
3671 large as the pointer assigned to it is. */
3672 if (gfc_array_size (lvalue, &lsize)
3673 && gfc_array_size (rvalue, &rsize)
3674 && mpz_cmp (rsize, lsize) < 0)
3676 gfc_error ("Rank remapping target is smaller than size of the"
3677 " pointer (%ld < %ld) at %L",
3678 mpz_get_si (rsize), mpz_get_si (lsize),
3683 /* The target must be either rank one or it must be simply contiguous
3684 and F2008 must be allowed. */
3685 if (rvalue->rank != 1)
3687 if (!gfc_is_simply_contiguous (rvalue, true))
3689 gfc_error ("Rank remapping target must be rank 1 or"
3690 " simply contiguous at %L", &rvalue->where);
3693 if (!gfc_notify_std (GFC_STD_F2008, "Rank remapping target is not "
3694 "rank 1 at %L", &rvalue->where))
3699 /* Now punt if we are dealing with a NULLIFY(X) or X = NULL(X). */
3700 if (rvalue->expr_type == EXPR_NULL)
3703 if (lvalue->ts.type == BT_CHARACTER)
3705 bool t = gfc_check_same_strlen (lvalue, rvalue, "pointer assignment");
3710 if (rvalue->expr_type == EXPR_VARIABLE && is_subref_array (rvalue))
3711 lvalue->symtree->n.sym->attr.subref_array_pointer = 1;
3713 attr = gfc_expr_attr (rvalue);
3715 if (rvalue->expr_type == EXPR_FUNCTION && !attr.pointer)
3717 gfc_error ("Target expression in pointer assignment "
3718 "at %L must deliver a pointer result",
3723 if (!attr.target && !attr.pointer)
3725 gfc_error ("Pointer assignment target is neither TARGET "
3726 "nor POINTER at %L", &rvalue->where);
3730 if (is_pure && gfc_impure_variable (rvalue->symtree->n.sym))
3732 gfc_error ("Bad target in pointer assignment in PURE "
3733 "procedure at %L", &rvalue->where);
3736 if (is_implicit_pure && gfc_impure_variable (rvalue->symtree->n.sym))
3737 gfc_unset_implicit_pure (gfc_current_ns->proc_name);
3739 if (gfc_has_vector_index (rvalue))
3741 gfc_error ("Pointer assignment with vector subscript "
3742 "on rhs at %L", &rvalue->where);
3746 if (attr.is_protected && attr.use_assoc
3747 && !(attr.pointer || attr.proc_pointer))
3749 gfc_error ("Pointer assignment target has PROTECTED "
3750 "attribute at %L", &rvalue->where);
3754 /* F2008, C725. For PURE also C1283. */
3755 if (rvalue->expr_type == EXPR_VARIABLE
3756 && gfc_is_coindexed (rvalue))
3759 for (ref = rvalue->ref; ref; ref = ref->next)
3760 if (ref->type == REF_ARRAY && ref->u.ar.codimen)
3762 gfc_error ("Data target at %L shall not have a coindex",
3768 /* Warn if it is the LHS pointer may lives longer than the RHS target. */
3769 if (warn_target_lifetime
3770 && rvalue->expr_type == EXPR_VARIABLE
3771 && !rvalue->symtree->n.sym->attr.save
3772 && !attr.pointer && !rvalue->symtree->n.sym->attr.host_assoc
3773 && !rvalue->symtree->n.sym->attr.in_common
3774 && !rvalue->symtree->n.sym->attr.use_assoc
3775 && !rvalue->symtree->n.sym->attr.dummy)
3780 warn = lvalue->symtree->n.sym->attr.dummy
3781 || lvalue->symtree->n.sym->attr.result
3782 || lvalue->symtree->n.sym->attr.function
3783 || (lvalue->symtree->n.sym->attr.host_assoc
3784 && lvalue->symtree->n.sym->ns
3785 != rvalue->symtree->n.sym->ns)
3786 || lvalue->symtree->n.sym->attr.use_assoc
3787 || lvalue->symtree->n.sym->attr.in_common;
3789 if (rvalue->symtree->n.sym->ns->proc_name
3790 && rvalue->symtree->n.sym->ns->proc_name->attr.flavor != FL_PROCEDURE
3791 && rvalue->symtree->n.sym->ns->proc_name->attr.flavor != FL_PROGRAM)
3792 for (ns = rvalue->symtree->n.sym->ns;
3793 ns && ns->proc_name && ns->proc_name->attr.flavor != FL_PROCEDURE;
3795 if (ns->parent == lvalue->symtree->n.sym->ns)
3802 gfc_warning (OPT_Wtarget_lifetime,
3803 "Pointer at %L in pointer assignment might outlive the "
3804 "pointer target", &lvalue->where);
3811 /* Relative of gfc_check_assign() except that the lvalue is a single
3812 symbol. Used for initialization assignments. */
3815 gfc_check_assign_symbol (gfc_symbol *sym, gfc_component *comp, gfc_expr *rvalue)
3819 bool pointer, proc_pointer;
3821 memset (&lvalue, '\0', sizeof (gfc_expr));
3823 lvalue.expr_type = EXPR_VARIABLE;
3824 lvalue.ts = sym->ts;
3826 lvalue.rank = sym->as->rank;
3827 lvalue.symtree = XCNEW (gfc_symtree);
3828 lvalue.symtree->n.sym = sym;
3829 lvalue.where = sym->declared_at;
3833 lvalue.ref = gfc_get_ref ();
3834 lvalue.ref->type = REF_COMPONENT;
3835 lvalue.ref->u.c.component = comp;
3836 lvalue.ref->u.c.sym = sym;
3837 lvalue.ts = comp->ts;
3838 lvalue.rank = comp->as ? comp->as->rank : 0;
3839 lvalue.where = comp->loc;
3840 pointer = comp->ts.type == BT_CLASS && CLASS_DATA (comp)
3841 ? CLASS_DATA (comp)->attr.class_pointer : comp->attr.pointer;
3842 proc_pointer = comp->attr.proc_pointer;
3846 pointer = sym->ts.type == BT_CLASS && CLASS_DATA (sym)
3847 ? CLASS_DATA (sym)->attr.class_pointer : sym->attr.pointer;
3848 proc_pointer = sym->attr.proc_pointer;
3851 if (pointer || proc_pointer)
3852 r = gfc_check_pointer_assign (&lvalue, rvalue);
3854 r = gfc_check_assign (&lvalue, rvalue, 1);
3856 free (lvalue.symtree);
3862 if (pointer && rvalue->expr_type != EXPR_NULL)
3864 /* F08:C461. Additional checks for pointer initialization. */
3865 symbol_attribute attr;
3866 attr = gfc_expr_attr (rvalue);
3867 if (attr.allocatable)
3869 gfc_error ("Pointer initialization target at %L "
3870 "must not be ALLOCATABLE", &rvalue->where);
3873 if (!attr.target || attr.pointer)
3875 gfc_error ("Pointer initialization target at %L "
3876 "must have the TARGET attribute", &rvalue->where);
3880 if (!attr.save && rvalue->expr_type == EXPR_VARIABLE
3881 && rvalue->symtree->n.sym->ns->proc_name
3882 && rvalue->symtree->n.sym->ns->proc_name->attr.is_main_program)
3884 rvalue->symtree->n.sym->ns->proc_name->attr.save = SAVE_IMPLICIT;
3885 attr.save = SAVE_IMPLICIT;
3890 gfc_error ("Pointer initialization target at %L "
3891 "must have the SAVE attribute", &rvalue->where);
3896 if (proc_pointer && rvalue->expr_type != EXPR_NULL)
3898 /* F08:C1220. Additional checks for procedure pointer initialization. */
3899 symbol_attribute attr = gfc_expr_attr (rvalue);
3900 if (attr.proc_pointer)
3902 gfc_error ("Procedure pointer initialization target at %L "
3903 "may not be a procedure pointer", &rvalue->where);
3912 /* Check for default initializer; sym->value is not enough
3913 as it is also set for EXPR_NULL of allocatables. */
3916 gfc_has_default_initializer (gfc_symbol *der)
3920 gcc_assert (der->attr.flavor == FL_DERIVED);
3921 for (c = der->components; c; c = c->next)
3922 if (c->ts.type == BT_DERIVED)
3924 if (!c->attr.pointer
3925 && gfc_has_default_initializer (c->ts.u.derived))
3927 if (c->attr.pointer && c->initializer)
3940 /* Get an expression for a default initializer. */
3943 gfc_default_initializer (gfc_typespec *ts)
3946 gfc_component *comp;
3948 /* See if we have a default initializer in this, but not in nested
3949 types (otherwise we could use gfc_has_default_initializer()). */
3950 for (comp = ts->u.derived->components; comp; comp = comp->next)
3951 if (comp->initializer || comp->attr.allocatable
3952 || (comp->ts.type == BT_CLASS && CLASS_DATA (comp)
3953 && CLASS_DATA (comp)->attr.allocatable))
3959 init = gfc_get_structure_constructor_expr (ts->type, ts->kind,
3960 &ts->u.derived->declared_at);
3963 for (comp = ts->u.derived->components; comp; comp = comp->next)
3965 gfc_constructor *ctor = gfc_constructor_get();
3967 if (comp->initializer)
3969 ctor->expr = gfc_copy_expr (comp->initializer);
3970 if ((comp->ts.type != comp->initializer->ts.type
3971 || comp->ts.kind != comp->initializer->ts.kind)
3972 && !comp->attr.pointer && !comp->attr.proc_pointer)
3973 gfc_convert_type_warn (ctor->expr, &comp->ts, 2, false);
3976 if (comp->attr.allocatable
3977 || (comp->ts.type == BT_CLASS && CLASS_DATA (comp)->attr.allocatable))
3979 ctor->expr = gfc_get_expr ();
3980 ctor->expr->expr_type = EXPR_NULL;
3981 ctor->expr->ts = comp->ts;
3984 gfc_constructor_append (&init->value.constructor, ctor);
3991 /* Given a symbol, create an expression node with that symbol as a
3992 variable. If the symbol is array valued, setup a reference of the
3996 gfc_get_variable_expr (gfc_symtree *var)
4000 e = gfc_get_expr ();
4001 e->expr_type = EXPR_VARIABLE;
4003 e->ts = var->n.sym->ts;
4005 if (var->n.sym->attr.flavor != FL_PROCEDURE
4006 && ((var->n.sym->as != NULL && var->n.sym->ts.type != BT_CLASS)
4007 || (var->n.sym->ts.type == BT_CLASS && CLASS_DATA (var->n.sym)
4008 && CLASS_DATA (var->n.sym)->as)))
4010 e->rank = var->n.sym->ts.type == BT_CLASS
4011 ? CLASS_DATA (var->n.sym)->as->rank : var->n.sym->as->rank;
4012 e->ref = gfc_get_ref ();
4013 e->ref->type = REF_ARRAY;
4014 e->ref->u.ar.type = AR_FULL;
4015 e->ref->u.ar.as = gfc_copy_array_spec (var->n.sym->ts.type == BT_CLASS
4016 ? CLASS_DATA (var->n.sym)->as
4024 /* Adds a full array reference to an expression, as needed. */
4027 gfc_add_full_array_ref (gfc_expr *e, gfc_array_spec *as)
4030 for (ref = e->ref; ref; ref = ref->next)
4035 ref->next = gfc_get_ref ();
4040 e->ref = gfc_get_ref ();
4043 ref->type = REF_ARRAY;
4044 ref->u.ar.type = AR_FULL;
4045 ref->u.ar.dimen = e->rank;
4046 ref->u.ar.where = e->where;
4052 gfc_lval_expr_from_sym (gfc_symbol *sym)
4055 lval = gfc_get_expr ();
4056 lval->expr_type = EXPR_VARIABLE;
4057 lval->where = sym->declared_at;
4059 lval->symtree = gfc_find_symtree (sym->ns->sym_root, sym->name);
4061 /* It will always be a full array. */
4062 lval->rank = sym->as ? sym->as->rank : 0;
4064 gfc_add_full_array_ref (lval, sym->ts.type == BT_CLASS ?
4065 CLASS_DATA (sym)->as : sym->as);
4070 /* Returns the array_spec of a full array expression. A NULL is
4071 returned otherwise. */
4073 gfc_get_full_arrayspec_from_expr (gfc_expr *expr)
4078 if (expr->rank == 0)
4081 /* Follow any component references. */
4082 if (expr->expr_type == EXPR_VARIABLE
4083 || expr->expr_type == EXPR_CONSTANT)
4085 as = expr->symtree->n.sym->as;
4086 for (ref = expr->ref; ref; ref = ref->next)
4091 as = ref->u.c.component->as;
4099 switch (ref->u.ar.type)
4122 /* General expression traversal function. */
4125 gfc_traverse_expr (gfc_expr *expr, gfc_symbol *sym,
4126 bool (*func)(gfc_expr *, gfc_symbol *, int*),
4131 gfc_actual_arglist *args;
4138 if ((*func) (expr, sym, &f))
4141 if (expr->ts.type == BT_CHARACTER
4143 && expr->ts.u.cl->length
4144 && expr->ts.u.cl->length->expr_type != EXPR_CONSTANT
4145 && gfc_traverse_expr (expr->ts.u.cl->length, sym, func, f))
4148 switch (expr->expr_type)
4153 for (args = expr->value.function.actual; args; args = args->next)
4155 if (gfc_traverse_expr (args->expr, sym, func, f))
4163 case EXPR_SUBSTRING:
4166 case EXPR_STRUCTURE:
4168 for (c = gfc_constructor_first (expr->value.constructor);
4169 c; c = gfc_constructor_next (c))
4171 if (gfc_traverse_expr (c->expr, sym, func, f))
4175 if (gfc_traverse_expr (c->iterator->var, sym, func, f))
4177 if (gfc_traverse_expr (c->iterator->start, sym, func, f))
4179 if (gfc_traverse_expr (c->iterator->end, sym, func, f))
4181 if (gfc_traverse_expr (c->iterator->step, sym, func, f))
4188 if (gfc_traverse_expr (expr->value.op.op1, sym, func, f))
4190 if (gfc_traverse_expr (expr->value.op.op2, sym, func, f))
4206 for (i = 0; i < GFC_MAX_DIMENSIONS; i++)
4208 if (gfc_traverse_expr (ar.start[i], sym, func, f))
4210 if (gfc_traverse_expr (ar.end[i], sym, func, f))
4212 if (gfc_traverse_expr (ar.stride[i], sym, func, f))
4218 if (gfc_traverse_expr (ref->u.ss.start, sym, func, f))
4220 if (gfc_traverse_expr (ref->u.ss.end, sym, func, f))
4225 if (ref->u.c.component->ts.type == BT_CHARACTER
4226 && ref->u.c.component->ts.u.cl
4227 && ref->u.c.component->ts.u.cl->length
4228 && ref->u.c.component->ts.u.cl->length->expr_type
4230 && gfc_traverse_expr (ref->u.c.component->ts.u.cl->length,
4234 if (ref->u.c.component->as)
4235 for (i = 0; i < ref->u.c.component->as->rank
4236 + ref->u.c.component->as->corank; i++)
4238 if (gfc_traverse_expr (ref->u.c.component->as->lower[i],
4241 if (gfc_traverse_expr (ref->u.c.component->as->upper[i],
4255 /* Traverse expr, marking all EXPR_VARIABLE symbols referenced. */
4258 expr_set_symbols_referenced (gfc_expr *expr,
4259 gfc_symbol *sym ATTRIBUTE_UNUSED,
4260 int *f ATTRIBUTE_UNUSED)
4262 if (expr->expr_type != EXPR_VARIABLE)
4264 gfc_set_sym_referenced (expr->symtree->n.sym);
4269 gfc_expr_set_symbols_referenced (gfc_expr *expr)
4271 gfc_traverse_expr (expr, NULL, expr_set_symbols_referenced, 0);
4275 /* Determine if an expression is a procedure pointer component and return
4276 the component in that case. Otherwise return NULL. */
4279 gfc_get_proc_ptr_comp (gfc_expr *expr)
4283 if (!expr || !expr->ref)
4290 if (ref->type == REF_COMPONENT
4291 && ref->u.c.component->attr.proc_pointer)
4292 return ref->u.c.component;
4298 /* Determine if an expression is a procedure pointer component. */
4301 gfc_is_proc_ptr_comp (gfc_expr *expr)
4303 return (gfc_get_proc_ptr_comp (expr) != NULL);
4307 /* Determine if an expression is a function with an allocatable class scalar
4310 gfc_is_alloc_class_scalar_function (gfc_expr *expr)
4312 if (expr->expr_type == EXPR_FUNCTION
4313 && expr->value.function.esym
4314 && expr->value.function.esym->result
4315 && expr->value.function.esym->result->ts.type == BT_CLASS
4316 && !CLASS_DATA (expr->value.function.esym->result)->attr.dimension
4317 && CLASS_DATA (expr->value.function.esym->result)->attr.allocatable)
4324 /* Determine if an expression is a function with an allocatable class array
4327 gfc_is_alloc_class_array_function (gfc_expr *expr)
4329 if (expr->expr_type == EXPR_FUNCTION
4330 && expr->value.function.esym
4331 && expr->value.function.esym->result
4332 && expr->value.function.esym->result->ts.type == BT_CLASS
4333 && CLASS_DATA (expr->value.function.esym->result)->attr.dimension
4334 && CLASS_DATA (expr->value.function.esym->result)->attr.allocatable)
4341 /* Walk an expression tree and check each variable encountered for being typed.
4342 If strict is not set, a top-level variable is tolerated untyped in -std=gnu
4343 mode as is a basic arithmetic expression using those; this is for things in
4346 INTEGER :: arr(n), n
4347 INTEGER :: arr(n + 1), n
4349 The namespace is needed for IMPLICIT typing. */
4351 static gfc_namespace* check_typed_ns;
4354 expr_check_typed_help (gfc_expr* e, gfc_symbol* sym ATTRIBUTE_UNUSED,
4355 int* f ATTRIBUTE_UNUSED)
4359 if (e->expr_type != EXPR_VARIABLE)
4362 gcc_assert (e->symtree);
4363 t = gfc_check_symbol_typed (e->symtree->n.sym, check_typed_ns,
4370 gfc_expr_check_typed (gfc_expr* e, gfc_namespace* ns, bool strict)
4374 /* If this is a top-level variable or EXPR_OP, do the check with strict given
4378 if (e->expr_type == EXPR_VARIABLE && !e->ref)
4379 return gfc_check_symbol_typed (e->symtree->n.sym, ns, strict, e->where);
4381 if (e->expr_type == EXPR_OP)
4385 gcc_assert (e->value.op.op1);
4386 t = gfc_expr_check_typed (e->value.op.op1, ns, strict);
4388 if (t && e->value.op.op2)
4389 t = gfc_expr_check_typed (e->value.op.op2, ns, strict);
4395 /* Otherwise, walk the expression and do it strictly. */
4396 check_typed_ns = ns;
4397 error_found = gfc_traverse_expr (e, NULL, &expr_check_typed_help, 0);
4399 return error_found ? false : true;
4404 gfc_ref_this_image (gfc_ref *ref)
4408 gcc_assert (ref->type == REF_ARRAY && ref->u.ar.codimen > 0);
4410 for (n = ref->u.ar.dimen; n < ref->u.ar.dimen + ref->u.ar.codimen; n++)
4411 if (ref->u.ar.dimen_type[n] != DIMEN_THIS_IMAGE)
4419 gfc_is_coindexed (gfc_expr *e)
4423 for (ref = e->ref; ref; ref = ref->next)
4424 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
4425 return !gfc_ref_this_image (ref);
4431 /* Coarrays are variables with a corank but not being coindexed. However, also
4432 the following is a coarray: A subobject of a coarray is a coarray if it does
4433 not have any cosubscripts, vector subscripts, allocatable component
4434 selection, or pointer component selection. (F2008, 2.4.7) */
4437 gfc_is_coarray (gfc_expr *e)
4441 gfc_component *comp;
4446 if (e->expr_type != EXPR_VARIABLE)
4450 sym = e->symtree->n.sym;
4452 if (sym->ts.type == BT_CLASS && sym->attr.class_ok)
4453 coarray = CLASS_DATA (sym)->attr.codimension;
4455 coarray = sym->attr.codimension;
4457 for (ref = e->ref; ref; ref = ref->next)
4461 comp = ref->u.c.component;
4462 if (comp->ts.type == BT_CLASS && comp->attr.class_ok
4463 && (CLASS_DATA (comp)->attr.class_pointer
4464 || CLASS_DATA (comp)->attr.allocatable))
4467 coarray = CLASS_DATA (comp)->attr.codimension;
4469 else if (comp->attr.pointer || comp->attr.allocatable)
4472 coarray = comp->attr.codimension;
4480 if (ref->u.ar.codimen > 0 && !gfc_ref_this_image (ref))
4486 for (i = 0; i < ref->u.ar.dimen; i++)
4487 if (ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4498 return coarray && !coindexed;
4503 gfc_get_corank (gfc_expr *e)
4508 if (!gfc_is_coarray (e))
4511 if (e->ts.type == BT_CLASS && e->ts.u.derived->components)
4512 corank = e->ts.u.derived->components->as
4513 ? e->ts.u.derived->components->as->corank : 0;
4515 corank = e->symtree->n.sym->as ? e->symtree->n.sym->as->corank : 0;
4517 for (ref = e->ref; ref; ref = ref->next)
4519 if (ref->type == REF_ARRAY)
4520 corank = ref->u.ar.as->corank;
4521 gcc_assert (ref->type != REF_SUBSTRING);
4528 /* Check whether the expression has an ultimate allocatable component.
4529 Being itself allocatable does not count. */
4531 gfc_has_ultimate_allocatable (gfc_expr *e)
4533 gfc_ref *ref, *last = NULL;
4535 if (e->expr_type != EXPR_VARIABLE)
4538 for (ref = e->ref; ref; ref = ref->next)
4539 if (ref->type == REF_COMPONENT)
4542 if (last && last->u.c.component->ts.type == BT_CLASS)
4543 return CLASS_DATA (last->u.c.component)->attr.alloc_comp;
4544 else if (last && last->u.c.component->ts.type == BT_DERIVED)
4545 return last->u.c.component->ts.u.derived->attr.alloc_comp;
4549 if (e->ts.type == BT_CLASS)
4550 return CLASS_DATA (e)->attr.alloc_comp;
4551 else if (e->ts.type == BT_DERIVED)
4552 return e->ts.u.derived->attr.alloc_comp;
4558 /* Check whether the expression has an pointer component.
4559 Being itself a pointer does not count. */
4561 gfc_has_ultimate_pointer (gfc_expr *e)
4563 gfc_ref *ref, *last = NULL;
4565 if (e->expr_type != EXPR_VARIABLE)
4568 for (ref = e->ref; ref; ref = ref->next)
4569 if (ref->type == REF_COMPONENT)
4572 if (last && last->u.c.component->ts.type == BT_CLASS)
4573 return CLASS_DATA (last->u.c.component)->attr.pointer_comp;
4574 else if (last && last->u.c.component->ts.type == BT_DERIVED)
4575 return last->u.c.component->ts.u.derived->attr.pointer_comp;
4579 if (e->ts.type == BT_CLASS)
4580 return CLASS_DATA (e)->attr.pointer_comp;
4581 else if (e->ts.type == BT_DERIVED)
4582 return e->ts.u.derived->attr.pointer_comp;
4588 /* Check whether an expression is "simply contiguous", cf. F2008, 6.5.4.
4589 Note: A scalar is not regarded as "simply contiguous" by the standard.
4590 if bool is not strict, some further checks are done - for instance,
4591 a "(::1)" is accepted. */
4594 gfc_is_simply_contiguous (gfc_expr *expr, bool strict)
4598 gfc_array_ref *ar = NULL;
4599 gfc_ref *ref, *part_ref = NULL;
4602 if (expr->expr_type == EXPR_FUNCTION)
4603 return expr->value.function.esym
4604 ? expr->value.function.esym->result->attr.contiguous : false;
4605 else if (expr->expr_type != EXPR_VARIABLE)
4608 if (expr->rank == 0)
4611 for (ref = expr->ref; ref; ref = ref->next)
4614 return false; /* Array shall be last part-ref. */
4616 if (ref->type == REF_COMPONENT)
4618 else if (ref->type == REF_SUBSTRING)
4620 else if (ref->u.ar.type != AR_ELEMENT)
4624 sym = expr->symtree->n.sym;
4625 if (expr->ts.type != BT_CLASS
4627 && !part_ref->u.c.component->attr.contiguous
4628 && part_ref->u.c.component->attr.pointer)
4630 && !sym->attr.contiguous
4631 && (sym->attr.pointer
4632 || sym->as->type == AS_ASSUMED_RANK
4633 || sym->as->type == AS_ASSUMED_SHAPE))))
4636 if (!ar || ar->type == AR_FULL)
4639 gcc_assert (ar->type == AR_SECTION);
4641 /* Check for simply contiguous array */
4643 for (i = 0; i < ar->dimen; i++)
4645 if (ar->dimen_type[i] == DIMEN_VECTOR)
4648 if (ar->dimen_type[i] == DIMEN_ELEMENT)
4654 gcc_assert (ar->dimen_type[i] == DIMEN_RANGE);
4657 /* If the previous section was not contiguous, that's an error,
4658 unless we have effective only one element and checking is not
4660 if (!colon && (strict || !ar->start[i] || !ar->end[i]
4661 || ar->start[i]->expr_type != EXPR_CONSTANT
4662 || ar->end[i]->expr_type != EXPR_CONSTANT
4663 || mpz_cmp (ar->start[i]->value.integer,
4664 ar->end[i]->value.integer) != 0))
4667 /* Following the standard, "(::1)" or - if known at compile time -
4668 "(lbound:ubound)" are not simply contiguous; if strict
4669 is false, they are regarded as simply contiguous. */
4670 if (ar->stride[i] && (strict || ar->stride[i]->expr_type != EXPR_CONSTANT
4671 || ar->stride[i]->ts.type != BT_INTEGER
4672 || mpz_cmp_si (ar->stride[i]->value.integer, 1) != 0))
4676 && (strict || ar->start[i]->expr_type != EXPR_CONSTANT
4677 || !ar->as->lower[i]
4678 || ar->as->lower[i]->expr_type != EXPR_CONSTANT
4679 || mpz_cmp (ar->start[i]->value.integer,
4680 ar->as->lower[i]->value.integer) != 0))
4684 && (strict || ar->end[i]->expr_type != EXPR_CONSTANT
4685 || !ar->as->upper[i]
4686 || ar->as->upper[i]->expr_type != EXPR_CONSTANT
4687 || mpz_cmp (ar->end[i]->value.integer,
4688 ar->as->upper[i]->value.integer) != 0))
4696 /* Build call to an intrinsic procedure. The number of arguments has to be
4697 passed (rather than ending the list with a NULL value) because we may
4698 want to add arguments but with a NULL-expression. */
4701 gfc_build_intrinsic_call (gfc_namespace *ns, gfc_isym_id id, const char* name,
4702 locus where, unsigned numarg, ...)
4705 gfc_actual_arglist* atail;
4706 gfc_intrinsic_sym* isym;
4709 const char *mangled_name = gfc_get_string (GFC_PREFIX ("%s"), name);
4711 isym = gfc_intrinsic_function_by_id (id);
4714 result = gfc_get_expr ();
4715 result->expr_type = EXPR_FUNCTION;
4716 result->ts = isym->ts;
4717 result->where = where;
4718 result->value.function.name = mangled_name;
4719 result->value.function.isym = isym;
4721 gfc_get_sym_tree (mangled_name, ns, &result->symtree, false);
4722 gfc_commit_symbol (result->symtree->n.sym);
4723 gcc_assert (result->symtree
4724 && (result->symtree->n.sym->attr.flavor == FL_PROCEDURE
4725 || result->symtree->n.sym->attr.flavor == FL_UNKNOWN));
4726 result->symtree->n.sym->intmod_sym_id = id;
4727 result->symtree->n.sym->attr.flavor = FL_PROCEDURE;
4728 result->symtree->n.sym->attr.intrinsic = 1;
4729 result->symtree->n.sym->attr.artificial = 1;
4731 va_start (ap, numarg);
4733 for (i = 0; i < numarg; ++i)
4737 atail->next = gfc_get_actual_arglist ();
4738 atail = atail->next;
4741 atail = result->value.function.actual = gfc_get_actual_arglist ();
4743 atail->expr = va_arg (ap, gfc_expr*);
4751 /* Check if an expression may appear in a variable definition context
4752 (F2008, 16.6.7) or pointer association context (F2008, 16.6.8).
4753 This is called from the various places when resolving
4754 the pieces that make up such a context.
4755 If own_scope is true (applies to, e.g., ac-implied-do/data-implied-do
4756 variables), some checks are not performed.
4758 Optionally, a possible error message can be suppressed if context is NULL
4759 and just the return status (true / false) be requested. */
4762 gfc_check_vardef_context (gfc_expr* e, bool pointer, bool alloc_obj,
4763 bool own_scope, const char* context)
4765 gfc_symbol* sym = NULL;
4767 bool check_intentin;
4769 symbol_attribute attr;
4773 if (e->expr_type == EXPR_VARIABLE)
4775 gcc_assert (e->symtree);
4776 sym = e->symtree->n.sym;
4778 else if (e->expr_type == EXPR_FUNCTION)
4780 gcc_assert (e->symtree);
4781 sym = e->value.function.esym ? e->value.function.esym : e->symtree->n.sym;
4784 attr = gfc_expr_attr (e);
4785 if (!pointer && e->expr_type == EXPR_FUNCTION && attr.pointer)
4787 if (!(gfc_option.allow_std & GFC_STD_F2008))
4790 gfc_error ("Fortran 2008: Pointer functions in variable definition"
4791 " context (%s) at %L", context, &e->where);
4795 else if (e->expr_type != EXPR_VARIABLE)
4798 gfc_error ("Non-variable expression in variable definition context (%s)"
4799 " at %L", context, &e->where);
4803 if (!pointer && sym->attr.flavor == FL_PARAMETER)
4806 gfc_error ("Named constant %qs in variable definition context (%s)"
4807 " at %L", sym->name, context, &e->where);
4810 if (!pointer && sym->attr.flavor != FL_VARIABLE
4811 && !(sym->attr.flavor == FL_PROCEDURE && sym == sym->result)
4812 && !(sym->attr.flavor == FL_PROCEDURE && sym->attr.proc_pointer))
4815 gfc_error ("%qs in variable definition context (%s) at %L is not"
4816 " a variable", sym->name, context, &e->where);
4820 /* Find out whether the expr is a pointer; this also means following
4821 component references to the last one. */
4822 is_pointer = (attr.pointer || attr.proc_pointer);
4823 if (pointer && !is_pointer)
4826 gfc_error ("Non-POINTER in pointer association context (%s)"
4827 " at %L", context, &e->where);
4834 || (e->ts.type == BT_DERIVED
4835 && e->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
4836 && e->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE)))
4839 gfc_error ("LOCK_TYPE in variable definition context (%s) at %L",
4840 context, &e->where);
4844 /* INTENT(IN) dummy argument. Check this, unless the object itself is the
4845 component of sub-component of a pointer; we need to distinguish
4846 assignment to a pointer component from pointer-assignment to a pointer
4847 component. Note that (normal) assignment to procedure pointers is not
4849 check_intentin = !own_scope;
4850 ptr_component = (sym->ts.type == BT_CLASS && CLASS_DATA (sym))
4851 ? CLASS_DATA (sym)->attr.class_pointer : sym->attr.pointer;
4852 for (ref = e->ref; ref && check_intentin; ref = ref->next)
4854 if (ptr_component && ref->type == REF_COMPONENT)
4855 check_intentin = false;
4856 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
4858 ptr_component = true;
4860 check_intentin = false;
4863 if (check_intentin && sym->attr.intent == INTENT_IN)
4865 if (pointer && is_pointer)
4868 gfc_error ("Dummy argument %qs with INTENT(IN) in pointer"
4869 " association context (%s) at %L",
4870 sym->name, context, &e->where);
4873 if (!pointer && !is_pointer && !sym->attr.pointer)
4876 gfc_error ("Dummy argument %qs with INTENT(IN) in variable"
4877 " definition context (%s) at %L",
4878 sym->name, context, &e->where);
4883 /* PROTECTED and use-associated. */
4884 if (sym->attr.is_protected && sym->attr.use_assoc && check_intentin)
4886 if (pointer && is_pointer)
4889 gfc_error ("Variable %qs is PROTECTED and can not appear in a"
4890 " pointer association context (%s) at %L",
4891 sym->name, context, &e->where);
4894 if (!pointer && !is_pointer)
4897 gfc_error ("Variable %qs is PROTECTED and can not appear in a"
4898 " variable definition context (%s) at %L",
4899 sym->name, context, &e->where);
4904 /* Variable not assignable from a PURE procedure but appears in
4905 variable definition context. */
4906 if (!pointer && !own_scope && gfc_pure (NULL) && gfc_impure_variable (sym))
4909 gfc_error ("Variable %qs can not appear in a variable definition"
4910 " context (%s) at %L in PURE procedure",
4911 sym->name, context, &e->where);
4915 if (!pointer && context && gfc_implicit_pure (NULL)
4916 && gfc_impure_variable (sym))
4921 for (ns = gfc_current_ns; ns; ns = ns->parent)
4923 sym = ns->proc_name;
4926 if (sym->attr.flavor == FL_PROCEDURE)
4928 sym->attr.implicit_pure = 0;
4933 /* Check variable definition context for associate-names. */
4934 if (!pointer && sym->assoc)
4937 gfc_association_list* assoc;
4939 gcc_assert (sym->assoc->target);
4941 /* If this is a SELECT TYPE temporary (the association is used internally
4942 for SELECT TYPE), silently go over to the target. */
4943 if (sym->attr.select_type_temporary)
4945 gfc_expr* t = sym->assoc->target;
4947 gcc_assert (t->expr_type == EXPR_VARIABLE);
4948 name = t->symtree->name;
4950 if (t->symtree->n.sym->assoc)
4951 assoc = t->symtree->n.sym->assoc;
4960 gcc_assert (name && assoc);
4962 /* Is association to a valid variable? */
4963 if (!assoc->variable)
4967 if (assoc->target->expr_type == EXPR_VARIABLE)
4968 gfc_error ("%qs at %L associated to vector-indexed target can"
4969 " not be used in a variable definition context (%s)",
4970 name, &e->where, context);
4972 gfc_error ("%qs at %L associated to expression can"
4973 " not be used in a variable definition context (%s)",
4974 name, &e->where, context);
4979 /* Target must be allowed to appear in a variable definition context. */
4980 if (!gfc_check_vardef_context (assoc->target, pointer, false, false, NULL))
4983 gfc_error_1 ("Associate-name '%s' can not appear in a variable"
4984 " definition context (%s) at %L because its target"
4985 " at %L can not, either",
4986 name, context, &e->where,
4987 &assoc->target->where);
4992 /* Check for same value in vector expression subscript. */
4995 for (ref = e->ref; ref != NULL; ref = ref->next)
4996 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
4997 for (i = 0; i < GFC_MAX_DIMENSIONS
4998 && ref->u.ar.dimen_type[i] != 0; i++)
4999 if (ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
5001 gfc_expr *arr = ref->u.ar.start[i];
5002 if (arr->expr_type == EXPR_ARRAY)
5004 gfc_constructor *c, *n;
5007 for (c = gfc_constructor_first (arr->value.constructor);
5008 c != NULL; c = gfc_constructor_next (c))
5010 if (c == NULL || c->iterator != NULL)
5015 for (n = gfc_constructor_next (c); n != NULL;
5016 n = gfc_constructor_next (n))
5018 if (n->iterator != NULL)
5022 if (gfc_dep_compare_expr (ec, en) == 0)
5025 gfc_error_now_1 ("Elements with the same value "
5026 "at %L and %L in vector "
5027 "subscript in a variable "
5028 "definition context (%s)",
5029 &(ec->where), &(en->where),