1 /* Routines for manipulation of expression nodes.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
4 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
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 NULL");
152 e->expr_type = EXPR_CONSTANT;
160 mpz_init (e->value.integer);
164 gfc_set_model_kind (kind);
165 mpfr_init (e->value.real);
169 gfc_set_model_kind (kind);
170 mpc_init2 (e->value.complex, mpfr_get_default_prec());
181 /* Get a new expression node that is an string constant.
182 If no string is passed, a string of len is allocated,
183 blanked and null-terminated. */
186 gfc_get_character_expr (int kind, locus *where, const char *src, int len)
193 dest = gfc_get_wide_string (len + 1);
194 gfc_wide_memset (dest, ' ', len);
198 dest = gfc_char_to_widechar (src);
200 e = gfc_get_constant_expr (BT_CHARACTER, kind,
201 where ? where : &gfc_current_locus);
202 e->value.character.string = dest;
203 e->value.character.length = len;
209 /* Get a new expression node that is an integer constant. */
212 gfc_get_int_expr (int kind, locus *where, int value)
215 p = gfc_get_constant_expr (BT_INTEGER, kind,
216 where ? where : &gfc_current_locus);
218 mpz_set_si (p->value.integer, value);
224 /* Get a new expression node that is a logical constant. */
227 gfc_get_logical_expr (int kind, locus *where, bool value)
230 p = gfc_get_constant_expr (BT_LOGICAL, kind,
231 where ? where : &gfc_current_locus);
233 p->value.logical = value;
240 gfc_get_iokind_expr (locus *where, io_kind k)
244 /* Set the types to something compatible with iokind. This is needed to
245 get through gfc_free_expr later since iokind really has no Basic Type,
249 e->expr_type = EXPR_CONSTANT;
250 e->ts.type = BT_LOGICAL;
258 /* Given an expression pointer, return a copy of the expression. This
259 subroutine is recursive. */
262 gfc_copy_expr (gfc_expr *p)
274 switch (q->expr_type)
277 s = gfc_get_wide_string (p->value.character.length + 1);
278 q->value.character.string = s;
279 memcpy (s, p->value.character.string,
280 (p->value.character.length + 1) * sizeof (gfc_char_t));
284 /* Copy target representation, if it exists. */
285 if (p->representation.string)
287 c = XCNEWVEC (char, p->representation.length + 1);
288 q->representation.string = c;
289 memcpy (c, p->representation.string, (p->representation.length + 1));
292 /* Copy the values of any pointer components of p->value. */
296 mpz_init_set (q->value.integer, p->value.integer);
300 gfc_set_model_kind (q->ts.kind);
301 mpfr_init (q->value.real);
302 mpfr_set (q->value.real, p->value.real, GFC_RND_MODE);
306 gfc_set_model_kind (q->ts.kind);
307 mpc_init2 (q->value.complex, mpfr_get_default_prec());
308 mpc_set (q->value.complex, p->value.complex, GFC_MPC_RND_MODE);
312 if (p->representation.string)
313 q->value.character.string
314 = gfc_char_to_widechar (q->representation.string);
317 s = gfc_get_wide_string (p->value.character.length + 1);
318 q->value.character.string = s;
320 /* This is the case for the C_NULL_CHAR named constant. */
321 if (p->value.character.length == 0
322 && (p->ts.is_c_interop || p->ts.is_iso_c))
325 /* Need to set the length to 1 to make sure the NUL
326 terminator is copied. */
327 q->value.character.length = 1;
330 memcpy (s, p->value.character.string,
331 (p->value.character.length + 1) * sizeof (gfc_char_t));
339 break; /* Already done. */
343 /* Should never be reached. */
345 gfc_internal_error ("gfc_copy_expr(): Bad expr node");
352 switch (q->value.op.op)
355 case INTRINSIC_PARENTHESES:
356 case INTRINSIC_UPLUS:
357 case INTRINSIC_UMINUS:
358 q->value.op.op1 = gfc_copy_expr (p->value.op.op1);
361 default: /* Binary operators. */
362 q->value.op.op1 = gfc_copy_expr (p->value.op.op1);
363 q->value.op.op2 = gfc_copy_expr (p->value.op.op2);
370 q->value.function.actual =
371 gfc_copy_actual_arglist (p->value.function.actual);
376 q->value.compcall.actual =
377 gfc_copy_actual_arglist (p->value.compcall.actual);
378 q->value.compcall.tbp = p->value.compcall.tbp;
383 q->value.constructor = gfc_constructor_copy (p->value.constructor);
391 q->shape = gfc_copy_shape (p->shape, p->rank);
393 q->ref = gfc_copy_ref (p->ref);
399 /* Workhorse function for gfc_free_expr() that frees everything
400 beneath an expression node, but not the node itself. This is
401 useful when we want to simplify a node and replace it with
402 something else or the expression node belongs to another structure. */
405 free_expr0 (gfc_expr *e)
409 switch (e->expr_type)
412 /* Free any parts of the value that need freeing. */
416 mpz_clear (e->value.integer);
420 mpfr_clear (e->value.real);
424 free (e->value.character.string);
428 mpc_clear (e->value.complex);
435 /* Free the representation. */
436 free (e->representation.string);
441 if (e->value.op.op1 != NULL)
442 gfc_free_expr (e->value.op.op1);
443 if (e->value.op.op2 != NULL)
444 gfc_free_expr (e->value.op.op2);
448 gfc_free_actual_arglist (e->value.function.actual);
453 gfc_free_actual_arglist (e->value.compcall.actual);
461 gfc_constructor_free (e->value.constructor);
465 free (e->value.character.string);
472 gfc_internal_error ("free_expr0(): Bad expr type");
475 /* Free a shape array. */
476 if (e->shape != NULL)
478 for (n = 0; n < e->rank; n++)
479 mpz_clear (e->shape[n]);
484 gfc_free_ref_list (e->ref);
486 memset (e, '\0', sizeof (gfc_expr));
490 /* Free an expression node and everything beneath it. */
493 gfc_free_expr (gfc_expr *e)
502 /* Free an argument list and everything below it. */
505 gfc_free_actual_arglist (gfc_actual_arglist *a1)
507 gfc_actual_arglist *a2;
512 gfc_free_expr (a1->expr);
519 /* Copy an arglist structure and all of the arguments. */
522 gfc_copy_actual_arglist (gfc_actual_arglist *p)
524 gfc_actual_arglist *head, *tail, *new_arg;
528 for (; p; p = p->next)
530 new_arg = gfc_get_actual_arglist ();
533 new_arg->expr = gfc_copy_expr (p->expr);
534 new_arg->next = NULL;
539 tail->next = new_arg;
548 /* Free a list of reference structures. */
551 gfc_free_ref_list (gfc_ref *p)
563 for (i = 0; i < GFC_MAX_DIMENSIONS; i++)
565 gfc_free_expr (p->u.ar.start[i]);
566 gfc_free_expr (p->u.ar.end[i]);
567 gfc_free_expr (p->u.ar.stride[i]);
573 gfc_free_expr (p->u.ss.start);
574 gfc_free_expr (p->u.ss.end);
586 /* Graft the *src expression onto the *dest subexpression. */
589 gfc_replace_expr (gfc_expr *dest, gfc_expr *src)
597 /* Try to extract an integer constant from the passed expression node.
598 Returns an error message or NULL if the result is set. It is
599 tempting to generate an error and return SUCCESS or FAILURE, but
600 failure is OK for some callers. */
603 gfc_extract_int (gfc_expr *expr, int *result)
605 if (expr->expr_type != EXPR_CONSTANT)
606 return _("Constant expression required at %C");
608 if (expr->ts.type != BT_INTEGER)
609 return _("Integer expression required at %C");
611 if ((mpz_cmp_si (expr->value.integer, INT_MAX) > 0)
612 || (mpz_cmp_si (expr->value.integer, INT_MIN) < 0))
614 return _("Integer value too large in expression at %C");
617 *result = (int) mpz_get_si (expr->value.integer);
623 /* Recursively copy a list of reference structures. */
626 gfc_copy_ref (gfc_ref *src)
634 dest = gfc_get_ref ();
635 dest->type = src->type;
640 ar = gfc_copy_array_ref (&src->u.ar);
646 dest->u.c = src->u.c;
650 dest->u.ss = src->u.ss;
651 dest->u.ss.start = gfc_copy_expr (src->u.ss.start);
652 dest->u.ss.end = gfc_copy_expr (src->u.ss.end);
656 dest->next = gfc_copy_ref (src->next);
662 /* Detect whether an expression has any vector index array references. */
665 gfc_has_vector_index (gfc_expr *e)
669 for (ref = e->ref; ref; ref = ref->next)
670 if (ref->type == REF_ARRAY)
671 for (i = 0; i < ref->u.ar.dimen; i++)
672 if (ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
678 /* Copy a shape array. */
681 gfc_copy_shape (mpz_t *shape, int rank)
689 new_shape = gfc_get_shape (rank);
691 for (n = 0; n < rank; n++)
692 mpz_init_set (new_shape[n], shape[n]);
698 /* Copy a shape array excluding dimension N, where N is an integer
699 constant expression. Dimensions are numbered in fortran style --
702 So, if the original shape array contains R elements
703 { s1 ... sN-1 sN sN+1 ... sR-1 sR}
704 the result contains R-1 elements:
705 { s1 ... sN-1 sN+1 ... sR-1}
707 If anything goes wrong -- N is not a constant, its value is out
708 of range -- or anything else, just returns NULL. */
711 gfc_copy_shape_excluding (mpz_t *shape, int rank, gfc_expr *dim)
713 mpz_t *new_shape, *s;
719 || dim->expr_type != EXPR_CONSTANT
720 || dim->ts.type != BT_INTEGER)
723 n = mpz_get_si (dim->value.integer);
724 n--; /* Convert to zero based index. */
725 if (n < 0 || n >= rank)
728 s = new_shape = gfc_get_shape (rank - 1);
730 for (i = 0; i < rank; i++)
734 mpz_init_set (*s, shape[i]);
742 /* Return the maximum kind of two expressions. In general, higher
743 kind numbers mean more precision for numeric types. */
746 gfc_kind_max (gfc_expr *e1, gfc_expr *e2)
748 return (e1->ts.kind > e2->ts.kind) ? e1->ts.kind : e2->ts.kind;
752 /* Returns nonzero if the type is numeric, zero otherwise. */
755 numeric_type (bt type)
757 return type == BT_COMPLEX || type == BT_REAL || type == BT_INTEGER;
761 /* Returns nonzero if the typespec is a numeric type, zero otherwise. */
764 gfc_numeric_ts (gfc_typespec *ts)
766 return numeric_type (ts->type);
770 /* Return an expression node with an optional argument list attached.
771 A variable number of gfc_expr pointers are strung together in an
772 argument list with a NULL pointer terminating the list. */
775 gfc_build_conversion (gfc_expr *e)
780 p->expr_type = EXPR_FUNCTION;
782 p->value.function.actual = NULL;
784 p->value.function.actual = gfc_get_actual_arglist ();
785 p->value.function.actual->expr = e;
791 /* Given an expression node with some sort of numeric binary
792 expression, insert type conversions required to make the operands
793 have the same type. Conversion warnings are disabled if wconversion
796 The exception is that the operands of an exponential don't have to
797 have the same type. If possible, the base is promoted to the type
798 of the exponent. For example, 1**2.3 becomes 1.0**2.3, but
799 1.0**2 stays as it is. */
802 gfc_type_convert_binary (gfc_expr *e, int wconversion)
806 op1 = e->value.op.op1;
807 op2 = e->value.op.op2;
809 if (op1->ts.type == BT_UNKNOWN || op2->ts.type == BT_UNKNOWN)
811 gfc_clear_ts (&e->ts);
815 /* Kind conversions of same type. */
816 if (op1->ts.type == op2->ts.type)
818 if (op1->ts.kind == op2->ts.kind)
820 /* No type conversions. */
825 if (op1->ts.kind > op2->ts.kind)
826 gfc_convert_type_warn (op2, &op1->ts, 2, wconversion);
828 gfc_convert_type_warn (op1, &op2->ts, 2, wconversion);
834 /* Integer combined with real or complex. */
835 if (op2->ts.type == BT_INTEGER)
839 /* Special case for ** operator. */
840 if (e->value.op.op == INTRINSIC_POWER)
843 gfc_convert_type_warn (e->value.op.op2, &e->ts, 2, wconversion);
847 if (op1->ts.type == BT_INTEGER)
850 gfc_convert_type_warn (e->value.op.op1, &e->ts, 2, wconversion);
854 /* Real combined with complex. */
855 e->ts.type = BT_COMPLEX;
856 if (op1->ts.kind > op2->ts.kind)
857 e->ts.kind = op1->ts.kind;
859 e->ts.kind = op2->ts.kind;
860 if (op1->ts.type != BT_COMPLEX || op1->ts.kind != e->ts.kind)
861 gfc_convert_type_warn (e->value.op.op1, &e->ts, 2, wconversion);
862 if (op2->ts.type != BT_COMPLEX || op2->ts.kind != e->ts.kind)
863 gfc_convert_type_warn (e->value.op.op2, &e->ts, 2, wconversion);
870 /* Function to determine if an expression is constant or not. This
871 function expects that the expression has already been simplified. */
874 gfc_is_constant_expr (gfc_expr *e)
877 gfc_actual_arglist *arg;
883 switch (e->expr_type)
886 return (gfc_is_constant_expr (e->value.op.op1)
887 && (e->value.op.op2 == NULL
888 || gfc_is_constant_expr (e->value.op.op2)));
896 gcc_assert (e->symtree || e->value.function.esym
897 || e->value.function.isym);
899 /* Call to intrinsic with at least one argument. */
900 if (e->value.function.isym && e->value.function.actual)
902 for (arg = e->value.function.actual; arg; arg = arg->next)
903 if (!gfc_is_constant_expr (arg->expr))
907 /* Specification functions are constant. */
908 /* F95, 7.1.6.2; F2003, 7.1.7 */
911 sym = e->symtree->n.sym;
912 if (e->value.function.esym)
913 sym = e->value.function.esym;
916 && sym->attr.function
918 && !sym->attr.intrinsic
919 && !sym->attr.recursive
920 && sym->attr.proc != PROC_INTERNAL
921 && sym->attr.proc != PROC_ST_FUNCTION
922 && sym->attr.proc != PROC_UNKNOWN
923 && sym->formal == NULL)
926 if (e->value.function.isym
927 && (e->value.function.isym->elemental
928 || e->value.function.isym->pure
929 || e->value.function.isym->inquiry
930 || e->value.function.isym->transformational))
940 return e->ref == NULL || (gfc_is_constant_expr (e->ref->u.ss.start)
941 && gfc_is_constant_expr (e->ref->u.ss.end));
945 c = gfc_constructor_first (e->value.constructor);
946 if ((e->expr_type == EXPR_ARRAY) && c && c->iterator)
947 return gfc_constant_ac (e);
949 for (; c; c = gfc_constructor_next (c))
950 if (!gfc_is_constant_expr (c->expr))
957 gfc_internal_error ("gfc_is_constant_expr(): Unknown expression type");
963 /* Is true if an array reference is followed by a component or substring
966 is_subref_array (gfc_expr * e)
971 if (e->expr_type != EXPR_VARIABLE)
974 if (e->symtree->n.sym->attr.subref_array_pointer)
978 for (ref = e->ref; ref; ref = ref->next)
980 if (ref->type == REF_ARRAY
981 && ref->u.ar.type != AR_ELEMENT)
985 && ref->type != REF_ARRAY)
992 /* Try to collapse intrinsic expressions. */
995 simplify_intrinsic_op (gfc_expr *p, int type)
998 gfc_expr *op1, *op2, *result;
1000 if (p->value.op.op == INTRINSIC_USER)
1003 op1 = p->value.op.op1;
1004 op2 = p->value.op.op2;
1005 op = p->value.op.op;
1007 if (gfc_simplify_expr (op1, type) == FAILURE)
1009 if (gfc_simplify_expr (op2, type) == FAILURE)
1012 if (!gfc_is_constant_expr (op1)
1013 || (op2 != NULL && !gfc_is_constant_expr (op2)))
1017 p->value.op.op1 = NULL;
1018 p->value.op.op2 = NULL;
1022 case INTRINSIC_PARENTHESES:
1023 result = gfc_parentheses (op1);
1026 case INTRINSIC_UPLUS:
1027 result = gfc_uplus (op1);
1030 case INTRINSIC_UMINUS:
1031 result = gfc_uminus (op1);
1034 case INTRINSIC_PLUS:
1035 result = gfc_add (op1, op2);
1038 case INTRINSIC_MINUS:
1039 result = gfc_subtract (op1, op2);
1042 case INTRINSIC_TIMES:
1043 result = gfc_multiply (op1, op2);
1046 case INTRINSIC_DIVIDE:
1047 result = gfc_divide (op1, op2);
1050 case INTRINSIC_POWER:
1051 result = gfc_power (op1, op2);
1054 case INTRINSIC_CONCAT:
1055 result = gfc_concat (op1, op2);
1059 case INTRINSIC_EQ_OS:
1060 result = gfc_eq (op1, op2, op);
1064 case INTRINSIC_NE_OS:
1065 result = gfc_ne (op1, op2, op);
1069 case INTRINSIC_GT_OS:
1070 result = gfc_gt (op1, op2, op);
1074 case INTRINSIC_GE_OS:
1075 result = gfc_ge (op1, op2, op);
1079 case INTRINSIC_LT_OS:
1080 result = gfc_lt (op1, op2, op);
1084 case INTRINSIC_LE_OS:
1085 result = gfc_le (op1, op2, op);
1089 result = gfc_not (op1);
1093 result = gfc_and (op1, op2);
1097 result = gfc_or (op1, op2);
1101 result = gfc_eqv (op1, op2);
1104 case INTRINSIC_NEQV:
1105 result = gfc_neqv (op1, op2);
1109 gfc_internal_error ("simplify_intrinsic_op(): Bad operator");
1114 gfc_free_expr (op1);
1115 gfc_free_expr (op2);
1119 result->rank = p->rank;
1120 result->where = p->where;
1121 gfc_replace_expr (p, result);
1127 /* Subroutine to simplify constructor expressions. Mutually recursive
1128 with gfc_simplify_expr(). */
1131 simplify_constructor (gfc_constructor_base base, int type)
1136 for (c = gfc_constructor_first (base); c; c = gfc_constructor_next (c))
1139 && (gfc_simplify_expr (c->iterator->start, type) == FAILURE
1140 || gfc_simplify_expr (c->iterator->end, type) == FAILURE
1141 || gfc_simplify_expr (c->iterator->step, type) == FAILURE))
1146 /* Try and simplify a copy. Replace the original if successful
1147 but keep going through the constructor at all costs. Not
1148 doing so can make a dog's dinner of complicated things. */
1149 p = gfc_copy_expr (c->expr);
1151 if (gfc_simplify_expr (p, type) == FAILURE)
1157 gfc_replace_expr (c->expr, p);
1165 /* Pull a single array element out of an array constructor. */
1168 find_array_element (gfc_constructor_base base, gfc_array_ref *ar,
1169 gfc_constructor **rval)
1171 unsigned long nelemen;
1177 gfc_constructor *cons;
1184 mpz_init_set_ui (offset, 0);
1187 mpz_init_set_ui (span, 1);
1188 for (i = 0; i < ar->dimen; i++)
1190 if (gfc_reduce_init_expr (ar->as->lower[i]) == FAILURE
1191 || gfc_reduce_init_expr (ar->as->upper[i]) == FAILURE)
1198 e = gfc_copy_expr (ar->start[i]);
1199 if (e->expr_type != EXPR_CONSTANT)
1205 gcc_assert (ar->as->upper[i]->expr_type == EXPR_CONSTANT
1206 && ar->as->lower[i]->expr_type == EXPR_CONSTANT);
1208 /* Check the bounds. */
1209 if ((ar->as->upper[i]
1210 && mpz_cmp (e->value.integer,
1211 ar->as->upper[i]->value.integer) > 0)
1212 || (mpz_cmp (e->value.integer,
1213 ar->as->lower[i]->value.integer) < 0))
1215 gfc_error ("Index in dimension %d is out of bounds "
1216 "at %L", i + 1, &ar->c_where[i]);
1222 mpz_sub (delta, e->value.integer, ar->as->lower[i]->value.integer);
1223 mpz_mul (delta, delta, span);
1224 mpz_add (offset, offset, delta);
1226 mpz_set_ui (tmp, 1);
1227 mpz_add (tmp, tmp, ar->as->upper[i]->value.integer);
1228 mpz_sub (tmp, tmp, ar->as->lower[i]->value.integer);
1229 mpz_mul (span, span, tmp);
1232 for (cons = gfc_constructor_first (base), nelemen = mpz_get_ui (offset);
1233 cons && nelemen > 0; cons = gfc_constructor_next (cons), nelemen--)
1254 /* Find a component of a structure constructor. */
1256 static gfc_constructor *
1257 find_component_ref (gfc_constructor_base base, gfc_ref *ref)
1259 gfc_component *comp;
1260 gfc_component *pick;
1261 gfc_constructor *c = gfc_constructor_first (base);
1263 comp = ref->u.c.sym->components;
1264 pick = ref->u.c.component;
1265 while (comp != pick)
1268 c = gfc_constructor_next (c);
1275 /* Replace an expression with the contents of a constructor, removing
1276 the subobject reference in the process. */
1279 remove_subobject_ref (gfc_expr *p, gfc_constructor *cons)
1289 e = gfc_copy_expr (p);
1290 e->ref = p->ref->next;
1291 p->ref->next = NULL;
1292 gfc_replace_expr (p, e);
1296 /* Pull an array section out of an array constructor. */
1299 find_array_section (gfc_expr *expr, gfc_ref *ref)
1306 long unsigned one = 1;
1308 mpz_t start[GFC_MAX_DIMENSIONS];
1309 mpz_t end[GFC_MAX_DIMENSIONS];
1310 mpz_t stride[GFC_MAX_DIMENSIONS];
1311 mpz_t delta[GFC_MAX_DIMENSIONS];
1312 mpz_t ctr[GFC_MAX_DIMENSIONS];
1317 gfc_constructor_base base;
1318 gfc_constructor *cons, *vecsub[GFC_MAX_DIMENSIONS];
1328 base = expr->value.constructor;
1329 expr->value.constructor = NULL;
1331 rank = ref->u.ar.as->rank;
1333 if (expr->shape == NULL)
1334 expr->shape = gfc_get_shape (rank);
1336 mpz_init_set_ui (delta_mpz, one);
1337 mpz_init_set_ui (nelts, one);
1340 /* Do the initialization now, so that we can cleanup without
1341 keeping track of where we were. */
1342 for (d = 0; d < rank; d++)
1344 mpz_init (delta[d]);
1345 mpz_init (start[d]);
1348 mpz_init (stride[d]);
1352 /* Build the counters to clock through the array reference. */
1354 for (d = 0; d < rank; d++)
1356 /* Make this stretch of code easier on the eye! */
1357 begin = ref->u.ar.start[d];
1358 finish = ref->u.ar.end[d];
1359 step = ref->u.ar.stride[d];
1360 lower = ref->u.ar.as->lower[d];
1361 upper = ref->u.ar.as->upper[d];
1363 if (ref->u.ar.dimen_type[d] == DIMEN_VECTOR) /* Vector subscript. */
1365 gfc_constructor *ci;
1368 if (begin->expr_type != EXPR_ARRAY || !gfc_is_constant_expr (begin))
1374 gcc_assert (begin->rank == 1);
1375 /* Zero-sized arrays have no shape and no elements, stop early. */
1378 mpz_init_set_ui (nelts, 0);
1382 vecsub[d] = gfc_constructor_first (begin->value.constructor);
1383 mpz_set (ctr[d], vecsub[d]->expr->value.integer);
1384 mpz_mul (nelts, nelts, begin->shape[0]);
1385 mpz_set (expr->shape[shape_i++], begin->shape[0]);
1388 for (ci = vecsub[d]; ci; ci = gfc_constructor_next (ci))
1390 if (mpz_cmp (ci->expr->value.integer, upper->value.integer) > 0
1391 || mpz_cmp (ci->expr->value.integer,
1392 lower->value.integer) < 0)
1394 gfc_error ("index in dimension %d is out of bounds "
1395 "at %L", d + 1, &ref->u.ar.c_where[d]);
1403 if ((begin && begin->expr_type != EXPR_CONSTANT)
1404 || (finish && finish->expr_type != EXPR_CONSTANT)
1405 || (step && step->expr_type != EXPR_CONSTANT))
1411 /* Obtain the stride. */
1413 mpz_set (stride[d], step->value.integer);
1415 mpz_set_ui (stride[d], one);
1417 if (mpz_cmp_ui (stride[d], 0) == 0)
1418 mpz_set_ui (stride[d], one);
1420 /* Obtain the start value for the index. */
1422 mpz_set (start[d], begin->value.integer);
1424 mpz_set (start[d], lower->value.integer);
1426 mpz_set (ctr[d], start[d]);
1428 /* Obtain the end value for the index. */
1430 mpz_set (end[d], finish->value.integer);
1432 mpz_set (end[d], upper->value.integer);
1434 /* Separate 'if' because elements sometimes arrive with
1436 if (ref->u.ar.dimen_type[d] == DIMEN_ELEMENT)
1437 mpz_set (end [d], begin->value.integer);
1439 /* Check the bounds. */
1440 if (mpz_cmp (ctr[d], upper->value.integer) > 0
1441 || mpz_cmp (end[d], upper->value.integer) > 0
1442 || mpz_cmp (ctr[d], lower->value.integer) < 0
1443 || mpz_cmp (end[d], lower->value.integer) < 0)
1445 gfc_error ("index in dimension %d is out of bounds "
1446 "at %L", d + 1, &ref->u.ar.c_where[d]);
1451 /* Calculate the number of elements and the shape. */
1452 mpz_set (tmp_mpz, stride[d]);
1453 mpz_add (tmp_mpz, end[d], tmp_mpz);
1454 mpz_sub (tmp_mpz, tmp_mpz, ctr[d]);
1455 mpz_div (tmp_mpz, tmp_mpz, stride[d]);
1456 mpz_mul (nelts, nelts, tmp_mpz);
1458 /* An element reference reduces the rank of the expression; don't
1459 add anything to the shape array. */
1460 if (ref->u.ar.dimen_type[d] != DIMEN_ELEMENT)
1461 mpz_set (expr->shape[shape_i++], tmp_mpz);
1464 /* Calculate the 'stride' (=delta) for conversion of the
1465 counter values into the index along the constructor. */
1466 mpz_set (delta[d], delta_mpz);
1467 mpz_sub (tmp_mpz, upper->value.integer, lower->value.integer);
1468 mpz_add_ui (tmp_mpz, tmp_mpz, one);
1469 mpz_mul (delta_mpz, delta_mpz, tmp_mpz);
1473 cons = gfc_constructor_first (base);
1475 /* Now clock through the array reference, calculating the index in
1476 the source constructor and transferring the elements to the new
1478 for (idx = 0; idx < (int) mpz_get_si (nelts); idx++)
1480 if (ref->u.ar.offset)
1481 mpz_set (ptr, ref->u.ar.offset->value.integer);
1483 mpz_init_set_ui (ptr, 0);
1486 for (d = 0; d < rank; d++)
1488 mpz_set (tmp_mpz, ctr[d]);
1489 mpz_sub (tmp_mpz, tmp_mpz, ref->u.ar.as->lower[d]->value.integer);
1490 mpz_mul (tmp_mpz, tmp_mpz, delta[d]);
1491 mpz_add (ptr, ptr, tmp_mpz);
1493 if (!incr_ctr) continue;
1495 if (ref->u.ar.dimen_type[d] == DIMEN_VECTOR) /* Vector subscript. */
1497 gcc_assert(vecsub[d]);
1499 if (!gfc_constructor_next (vecsub[d]))
1500 vecsub[d] = gfc_constructor_first (ref->u.ar.start[d]->value.constructor);
1503 vecsub[d] = gfc_constructor_next (vecsub[d]);
1506 mpz_set (ctr[d], vecsub[d]->expr->value.integer);
1510 mpz_add (ctr[d], ctr[d], stride[d]);
1512 if (mpz_cmp_ui (stride[d], 0) > 0
1513 ? mpz_cmp (ctr[d], end[d]) > 0
1514 : mpz_cmp (ctr[d], end[d]) < 0)
1515 mpz_set (ctr[d], start[d]);
1521 limit = mpz_get_ui (ptr);
1522 if (limit >= gfc_option.flag_max_array_constructor)
1524 gfc_error ("The number of elements in the array constructor "
1525 "at %L requires an increase of the allowed %d "
1526 "upper limit. See -fmax-array-constructor "
1527 "option", &expr->where,
1528 gfc_option.flag_max_array_constructor);
1532 cons = gfc_constructor_lookup (base, limit);
1534 gfc_constructor_append_expr (&expr->value.constructor,
1535 gfc_copy_expr (cons->expr), NULL);
1542 mpz_clear (delta_mpz);
1543 mpz_clear (tmp_mpz);
1545 for (d = 0; d < rank; d++)
1547 mpz_clear (delta[d]);
1548 mpz_clear (start[d]);
1551 mpz_clear (stride[d]);
1553 gfc_constructor_free (base);
1557 /* Pull a substring out of an expression. */
1560 find_substring_ref (gfc_expr *p, gfc_expr **newp)
1567 if (p->ref->u.ss.start->expr_type != EXPR_CONSTANT
1568 || p->ref->u.ss.end->expr_type != EXPR_CONSTANT)
1571 *newp = gfc_copy_expr (p);
1572 free ((*newp)->value.character.string);
1574 end = (int) mpz_get_ui (p->ref->u.ss.end->value.integer);
1575 start = (int) mpz_get_ui (p->ref->u.ss.start->value.integer);
1576 length = end - start + 1;
1578 chr = (*newp)->value.character.string = gfc_get_wide_string (length + 1);
1579 (*newp)->value.character.length = length;
1580 memcpy (chr, &p->value.character.string[start - 1],
1581 length * sizeof (gfc_char_t));
1588 /* Simplify a subobject reference of a constructor. This occurs when
1589 parameter variable values are substituted. */
1592 simplify_const_ref (gfc_expr *p)
1594 gfc_constructor *cons, *c;
1600 switch (p->ref->type)
1603 switch (p->ref->u.ar.type)
1606 /* <type/kind spec>, parameter :: x(<int>) = scalar_expr
1607 will generate this. */
1608 if (p->expr_type != EXPR_ARRAY)
1610 remove_subobject_ref (p, NULL);
1613 if (find_array_element (p->value.constructor, &p->ref->u.ar,
1620 remove_subobject_ref (p, cons);
1624 if (find_array_section (p, p->ref) == FAILURE)
1626 p->ref->u.ar.type = AR_FULL;
1631 if (p->ref->next != NULL
1632 && (p->ts.type == BT_CHARACTER || p->ts.type == BT_DERIVED))
1634 for (c = gfc_constructor_first (p->value.constructor);
1635 c; c = gfc_constructor_next (c))
1637 c->expr->ref = gfc_copy_ref (p->ref->next);
1638 if (simplify_const_ref (c->expr) == FAILURE)
1642 if (p->ts.type == BT_DERIVED
1644 && (c = gfc_constructor_first (p->value.constructor)))
1646 /* There may have been component references. */
1647 p->ts = c->expr->ts;
1651 for (; last_ref->next; last_ref = last_ref->next) {};
1653 if (p->ts.type == BT_CHARACTER
1654 && last_ref->type == REF_SUBSTRING)
1656 /* If this is a CHARACTER array and we possibly took
1657 a substring out of it, update the type-spec's
1658 character length according to the first element
1659 (as all should have the same length). */
1661 if ((c = gfc_constructor_first (p->value.constructor)))
1663 const gfc_expr* first = c->expr;
1664 gcc_assert (first->expr_type == EXPR_CONSTANT);
1665 gcc_assert (first->ts.type == BT_CHARACTER);
1666 string_len = first->value.character.length;
1672 p->ts.u.cl = gfc_new_charlen (p->symtree->n.sym->ns,
1675 gfc_free_expr (p->ts.u.cl->length);
1678 = gfc_get_int_expr (gfc_default_integer_kind,
1682 gfc_free_ref_list (p->ref);
1693 cons = find_component_ref (p->value.constructor, p->ref);
1694 remove_subobject_ref (p, cons);
1698 if (find_substring_ref (p, &newp) == FAILURE)
1701 gfc_replace_expr (p, newp);
1702 gfc_free_ref_list (p->ref);
1712 /* Simplify a chain of references. */
1715 simplify_ref_chain (gfc_ref *ref, int type)
1719 for (; ref; ref = ref->next)
1724 for (n = 0; n < ref->u.ar.dimen; n++)
1726 if (gfc_simplify_expr (ref->u.ar.start[n], type) == FAILURE)
1728 if (gfc_simplify_expr (ref->u.ar.end[n], type) == FAILURE)
1730 if (gfc_simplify_expr (ref->u.ar.stride[n], type) == FAILURE)
1736 if (gfc_simplify_expr (ref->u.ss.start, type) == FAILURE)
1738 if (gfc_simplify_expr (ref->u.ss.end, type) == FAILURE)
1750 /* Try to substitute the value of a parameter variable. */
1753 simplify_parameter_variable (gfc_expr *p, int type)
1758 e = gfc_copy_expr (p->symtree->n.sym->value);
1764 /* Do not copy subobject refs for constant. */
1765 if (e->expr_type != EXPR_CONSTANT && p->ref != NULL)
1766 e->ref = gfc_copy_ref (p->ref);
1767 t = gfc_simplify_expr (e, type);
1769 /* Only use the simplification if it eliminated all subobject references. */
1770 if (t == SUCCESS && !e->ref)
1771 gfc_replace_expr (p, e);
1778 /* Given an expression, simplify it by collapsing constant
1779 expressions. Most simplification takes place when the expression
1780 tree is being constructed. If an intrinsic function is simplified
1781 at some point, we get called again to collapse the result against
1784 We work by recursively simplifying expression nodes, simplifying
1785 intrinsic functions where possible, which can lead to further
1786 constant collapsing. If an operator has constant operand(s), we
1787 rip the expression apart, and rebuild it, hoping that it becomes
1790 The expression type is defined for:
1791 0 Basic expression parsing
1792 1 Simplifying array constructors -- will substitute
1794 Returns FAILURE on error, SUCCESS otherwise.
1795 NOTE: Will return SUCCESS even if the expression can not be simplified. */
1798 gfc_simplify_expr (gfc_expr *p, int type)
1800 gfc_actual_arglist *ap;
1805 switch (p->expr_type)
1812 for (ap = p->value.function.actual; ap; ap = ap->next)
1813 if (gfc_simplify_expr (ap->expr, type) == FAILURE)
1816 if (p->value.function.isym != NULL
1817 && gfc_intrinsic_func_interface (p, 1) == MATCH_ERROR)
1822 case EXPR_SUBSTRING:
1823 if (simplify_ref_chain (p->ref, type) == FAILURE)
1826 if (gfc_is_constant_expr (p))
1832 if (p->ref && p->ref->u.ss.start)
1834 gfc_extract_int (p->ref->u.ss.start, &start);
1835 start--; /* Convert from one-based to zero-based. */
1838 end = p->value.character.length;
1839 if (p->ref && p->ref->u.ss.end)
1840 gfc_extract_int (p->ref->u.ss.end, &end);
1842 s = gfc_get_wide_string (end - start + 2);
1843 memcpy (s, p->value.character.string + start,
1844 (end - start) * sizeof (gfc_char_t));
1845 s[end - start + 1] = '\0'; /* TODO: C-style string. */
1846 free (p->value.character.string);
1847 p->value.character.string = s;
1848 p->value.character.length = end - start;
1849 p->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
1850 p->ts.u.cl->length = gfc_get_int_expr (gfc_default_integer_kind,
1852 p->value.character.length);
1853 gfc_free_ref_list (p->ref);
1855 p->expr_type = EXPR_CONSTANT;
1860 if (simplify_intrinsic_op (p, type) == FAILURE)
1865 /* Only substitute array parameter variables if we are in an
1866 initialization expression, or we want a subsection. */
1867 if (p->symtree->n.sym->attr.flavor == FL_PARAMETER
1868 && (gfc_init_expr_flag || p->ref
1869 || p->symtree->n.sym->value->expr_type != EXPR_ARRAY))
1871 if (simplify_parameter_variable (p, type) == FAILURE)
1878 gfc_simplify_iterator_var (p);
1881 /* Simplify subcomponent references. */
1882 if (simplify_ref_chain (p->ref, type) == FAILURE)
1887 case EXPR_STRUCTURE:
1889 if (simplify_ref_chain (p->ref, type) == FAILURE)
1892 if (simplify_constructor (p->value.constructor, type) == FAILURE)
1895 if (p->expr_type == EXPR_ARRAY && p->ref && p->ref->type == REF_ARRAY
1896 && p->ref->u.ar.type == AR_FULL)
1897 gfc_expand_constructor (p, false);
1899 if (simplify_const_ref (p) == FAILURE)
1914 /* Returns the type of an expression with the exception that iterator
1915 variables are automatically integers no matter what else they may
1921 if (e->expr_type == EXPR_VARIABLE && gfc_check_iter_variable (e) == SUCCESS)
1928 /* Check an intrinsic arithmetic operation to see if it is consistent
1929 with some type of expression. */
1931 static gfc_try check_init_expr (gfc_expr *);
1934 /* Scalarize an expression for an elemental intrinsic call. */
1937 scalarize_intrinsic_call (gfc_expr *e)
1939 gfc_actual_arglist *a, *b;
1940 gfc_constructor_base ctor;
1941 gfc_constructor *args[5];
1942 gfc_constructor *ci, *new_ctor;
1943 gfc_expr *expr, *old;
1944 int n, i, rank[5], array_arg;
1946 /* Find which, if any, arguments are arrays. Assume that the old
1947 expression carries the type information and that the first arg
1948 that is an array expression carries all the shape information.*/
1950 a = e->value.function.actual;
1951 for (; a; a = a->next)
1954 if (a->expr->expr_type != EXPR_ARRAY)
1957 expr = gfc_copy_expr (a->expr);
1964 old = gfc_copy_expr (e);
1966 gfc_constructor_free (expr->value.constructor);
1967 expr->value.constructor = NULL;
1969 expr->where = old->where;
1970 expr->expr_type = EXPR_ARRAY;
1972 /* Copy the array argument constructors into an array, with nulls
1975 a = old->value.function.actual;
1976 for (; a; a = a->next)
1978 /* Check that this is OK for an initialization expression. */
1979 if (a->expr && check_init_expr (a->expr) == FAILURE)
1983 if (a->expr && a->expr->rank && a->expr->expr_type == EXPR_VARIABLE)
1985 rank[n] = a->expr->rank;
1986 ctor = a->expr->symtree->n.sym->value->value.constructor;
1987 args[n] = gfc_constructor_first (ctor);
1989 else if (a->expr && a->expr->expr_type == EXPR_ARRAY)
1992 rank[n] = a->expr->rank;
1995 ctor = gfc_constructor_copy (a->expr->value.constructor);
1996 args[n] = gfc_constructor_first (ctor);
2005 /* Using the array argument as the master, step through the array
2006 calling the function for each element and advancing the array
2007 constructors together. */
2008 for (ci = args[array_arg - 1]; ci; ci = gfc_constructor_next (ci))
2010 new_ctor = gfc_constructor_append_expr (&expr->value.constructor,
2011 gfc_copy_expr (old), NULL);
2013 gfc_free_actual_arglist (new_ctor->expr->value.function.actual);
2015 b = old->value.function.actual;
2016 for (i = 0; i < n; i++)
2019 new_ctor->expr->value.function.actual
2020 = a = gfc_get_actual_arglist ();
2023 a->next = gfc_get_actual_arglist ();
2028 a->expr = gfc_copy_expr (args[i]->expr);
2030 a->expr = gfc_copy_expr (b->expr);
2035 /* Simplify the function calls. If the simplification fails, the
2036 error will be flagged up down-stream or the library will deal
2038 gfc_simplify_expr (new_ctor->expr, 0);
2040 for (i = 0; i < n; i++)
2042 args[i] = gfc_constructor_next (args[i]);
2044 for (i = 1; i < n; i++)
2045 if (rank[i] && ((args[i] != NULL && args[array_arg - 1] == NULL)
2046 || (args[i] == NULL && args[array_arg - 1] != NULL)))
2052 gfc_free_expr (old);
2056 gfc_error_now ("elemental function arguments at %C are not compliant");
2059 gfc_free_expr (expr);
2060 gfc_free_expr (old);
2066 check_intrinsic_op (gfc_expr *e, gfc_try (*check_function) (gfc_expr *))
2068 gfc_expr *op1 = e->value.op.op1;
2069 gfc_expr *op2 = e->value.op.op2;
2071 if ((*check_function) (op1) == FAILURE)
2074 switch (e->value.op.op)
2076 case INTRINSIC_UPLUS:
2077 case INTRINSIC_UMINUS:
2078 if (!numeric_type (et0 (op1)))
2083 case INTRINSIC_EQ_OS:
2085 case INTRINSIC_NE_OS:
2087 case INTRINSIC_GT_OS:
2089 case INTRINSIC_GE_OS:
2091 case INTRINSIC_LT_OS:
2093 case INTRINSIC_LE_OS:
2094 if ((*check_function) (op2) == FAILURE)
2097 if (!(et0 (op1) == BT_CHARACTER && et0 (op2) == BT_CHARACTER)
2098 && !(numeric_type (et0 (op1)) && numeric_type (et0 (op2))))
2100 gfc_error ("Numeric or CHARACTER operands are required in "
2101 "expression at %L", &e->where);
2106 case INTRINSIC_PLUS:
2107 case INTRINSIC_MINUS:
2108 case INTRINSIC_TIMES:
2109 case INTRINSIC_DIVIDE:
2110 case INTRINSIC_POWER:
2111 if ((*check_function) (op2) == FAILURE)
2114 if (!numeric_type (et0 (op1)) || !numeric_type (et0 (op2)))
2119 case INTRINSIC_CONCAT:
2120 if ((*check_function) (op2) == FAILURE)
2123 if (et0 (op1) != BT_CHARACTER || et0 (op2) != BT_CHARACTER)
2125 gfc_error ("Concatenation operator in expression at %L "
2126 "must have two CHARACTER operands", &op1->where);
2130 if (op1->ts.kind != op2->ts.kind)
2132 gfc_error ("Concat operator at %L must concatenate strings of the "
2133 "same kind", &e->where);
2140 if (et0 (op1) != BT_LOGICAL)
2142 gfc_error (".NOT. operator in expression at %L must have a LOGICAL "
2143 "operand", &op1->where);
2152 case INTRINSIC_NEQV:
2153 if ((*check_function) (op2) == FAILURE)
2156 if (et0 (op1) != BT_LOGICAL || et0 (op2) != BT_LOGICAL)
2158 gfc_error ("LOGICAL operands are required in expression at %L",
2165 case INTRINSIC_PARENTHESES:
2169 gfc_error ("Only intrinsic operators can be used in expression at %L",
2177 gfc_error ("Numeric operands are required in expression at %L", &e->where);
2182 /* F2003, 7.1.7 (3): In init expression, allocatable components
2183 must not be data-initialized. */
2185 check_alloc_comp_init (gfc_expr *e)
2187 gfc_component *comp;
2188 gfc_constructor *ctor;
2190 gcc_assert (e->expr_type == EXPR_STRUCTURE);
2191 gcc_assert (e->ts.type == BT_DERIVED);
2193 for (comp = e->ts.u.derived->components,
2194 ctor = gfc_constructor_first (e->value.constructor);
2195 comp; comp = comp->next, ctor = gfc_constructor_next (ctor))
2197 if (comp->attr.allocatable
2198 && ctor->expr->expr_type != EXPR_NULL)
2200 gfc_error("Invalid initialization expression for ALLOCATABLE "
2201 "component '%s' in structure constructor at %L",
2202 comp->name, &ctor->expr->where);
2211 check_init_expr_arguments (gfc_expr *e)
2213 gfc_actual_arglist *ap;
2215 for (ap = e->value.function.actual; ap; ap = ap->next)
2216 if (check_init_expr (ap->expr) == FAILURE)
2222 static gfc_try check_restricted (gfc_expr *);
2224 /* F95, 7.1.6.1, Initialization expressions, (7)
2225 F2003, 7.1.7 Initialization expression, (8) */
2228 check_inquiry (gfc_expr *e, int not_restricted)
2231 const char *const *functions;
2233 static const char *const inquiry_func_f95[] = {
2234 "lbound", "shape", "size", "ubound",
2235 "bit_size", "len", "kind",
2236 "digits", "epsilon", "huge", "maxexponent", "minexponent",
2237 "precision", "radix", "range", "tiny",
2241 static const char *const inquiry_func_f2003[] = {
2242 "lbound", "shape", "size", "ubound",
2243 "bit_size", "len", "kind",
2244 "digits", "epsilon", "huge", "maxexponent", "minexponent",
2245 "precision", "radix", "range", "tiny",
2250 gfc_actual_arglist *ap;
2252 if (!e->value.function.isym
2253 || !e->value.function.isym->inquiry)
2256 /* An undeclared parameter will get us here (PR25018). */
2257 if (e->symtree == NULL)
2260 name = e->symtree->n.sym->name;
2262 functions = (gfc_option.warn_std & GFC_STD_F2003)
2263 ? inquiry_func_f2003 : inquiry_func_f95;
2265 for (i = 0; functions[i]; i++)
2266 if (strcmp (functions[i], name) == 0)
2269 if (functions[i] == NULL)
2272 /* At this point we have an inquiry function with a variable argument. The
2273 type of the variable might be undefined, but we need it now, because the
2274 arguments of these functions are not allowed to be undefined. */
2276 for (ap = e->value.function.actual; ap; ap = ap->next)
2281 if (ap->expr->ts.type == BT_UNKNOWN)
2283 if (ap->expr->symtree->n.sym->ts.type == BT_UNKNOWN
2284 && gfc_set_default_type (ap->expr->symtree->n.sym, 0, gfc_current_ns)
2288 ap->expr->ts = ap->expr->symtree->n.sym->ts;
2291 /* Assumed character length will not reduce to a constant expression
2292 with LEN, as required by the standard. */
2293 if (i == 5 && not_restricted
2294 && ap->expr->symtree->n.sym->ts.type == BT_CHARACTER
2295 && (ap->expr->symtree->n.sym->ts.u.cl->length == NULL
2296 || ap->expr->symtree->n.sym->ts.deferred))
2298 gfc_error ("Assumed or deferred character length variable '%s' "
2299 " in constant expression at %L",
2300 ap->expr->symtree->n.sym->name,
2304 else if (not_restricted && check_init_expr (ap->expr) == FAILURE)
2307 if (not_restricted == 0
2308 && ap->expr->expr_type != EXPR_VARIABLE
2309 && check_restricted (ap->expr) == FAILURE)
2312 if (not_restricted == 0
2313 && ap->expr->expr_type == EXPR_VARIABLE
2314 && ap->expr->symtree->n.sym->attr.dummy
2315 && ap->expr->symtree->n.sym->attr.optional)
2323 /* F95, 7.1.6.1, Initialization expressions, (5)
2324 F2003, 7.1.7 Initialization expression, (5) */
2327 check_transformational (gfc_expr *e)
2329 static const char * const trans_func_f95[] = {
2330 "repeat", "reshape", "selected_int_kind",
2331 "selected_real_kind", "transfer", "trim", NULL
2334 static const char * const trans_func_f2003[] = {
2335 "all", "any", "count", "dot_product", "matmul", "null", "pack",
2336 "product", "repeat", "reshape", "selected_char_kind", "selected_int_kind",
2337 "selected_real_kind", "spread", "sum", "transfer", "transpose",
2338 "trim", "unpack", NULL
2343 const char *const *functions;
2345 if (!e->value.function.isym
2346 || !e->value.function.isym->transformational)
2349 name = e->symtree->n.sym->name;
2351 functions = (gfc_option.allow_std & GFC_STD_F2003)
2352 ? trans_func_f2003 : trans_func_f95;
2354 /* NULL() is dealt with below. */
2355 if (strcmp ("null", name) == 0)
2358 for (i = 0; functions[i]; i++)
2359 if (strcmp (functions[i], name) == 0)
2362 if (functions[i] == NULL)
2364 gfc_error("transformational intrinsic '%s' at %L is not permitted "
2365 "in an initialization expression", name, &e->where);
2369 return check_init_expr_arguments (e);
2373 /* F95, 7.1.6.1, Initialization expressions, (6)
2374 F2003, 7.1.7 Initialization expression, (6) */
2377 check_null (gfc_expr *e)
2379 if (strcmp ("null", e->symtree->n.sym->name) != 0)
2382 return check_init_expr_arguments (e);
2387 check_elemental (gfc_expr *e)
2389 if (!e->value.function.isym
2390 || !e->value.function.isym->elemental)
2393 if (e->ts.type != BT_INTEGER
2394 && e->ts.type != BT_CHARACTER
2395 && gfc_notify_std (GFC_STD_F2003, "Extension: Evaluation of "
2396 "nonstandard initialization expression at %L",
2397 &e->where) == FAILURE)
2400 return check_init_expr_arguments (e);
2405 check_conversion (gfc_expr *e)
2407 if (!e->value.function.isym
2408 || !e->value.function.isym->conversion)
2411 return check_init_expr_arguments (e);
2415 /* Verify that an expression is an initialization expression. A side
2416 effect is that the expression tree is reduced to a single constant
2417 node if all goes well. This would normally happen when the
2418 expression is constructed but function references are assumed to be
2419 intrinsics in the context of initialization expressions. If
2420 FAILURE is returned an error message has been generated. */
2423 check_init_expr (gfc_expr *e)
2431 switch (e->expr_type)
2434 t = check_intrinsic_op (e, check_init_expr);
2436 t = gfc_simplify_expr (e, 0);
2444 gfc_intrinsic_sym* isym;
2447 sym = e->symtree->n.sym;
2448 if (!gfc_is_intrinsic (sym, 0, e->where)
2449 || (m = gfc_intrinsic_func_interface (e, 0)) != MATCH_YES)
2451 gfc_error ("Function '%s' in initialization expression at %L "
2452 "must be an intrinsic function",
2453 e->symtree->n.sym->name, &e->where);
2457 if ((m = check_conversion (e)) == MATCH_NO
2458 && (m = check_inquiry (e, 1)) == MATCH_NO
2459 && (m = check_null (e)) == MATCH_NO
2460 && (m = check_transformational (e)) == MATCH_NO
2461 && (m = check_elemental (e)) == MATCH_NO)
2463 gfc_error ("Intrinsic function '%s' at %L is not permitted "
2464 "in an initialization expression",
2465 e->symtree->n.sym->name, &e->where);
2469 /* Try to scalarize an elemental intrinsic function that has an
2471 isym = gfc_find_function (e->symtree->n.sym->name);
2472 if (isym && isym->elemental
2473 && (t = scalarize_intrinsic_call (e)) == SUCCESS)
2478 t = gfc_simplify_expr (e, 0);
2485 if (gfc_check_iter_variable (e) == SUCCESS)
2488 if (e->symtree->n.sym->attr.flavor == FL_PARAMETER)
2490 /* A PARAMETER shall not be used to define itself, i.e.
2491 REAL, PARAMETER :: x = transfer(0, x)
2493 if (!e->symtree->n.sym->value)
2495 gfc_error("PARAMETER '%s' is used at %L before its definition "
2496 "is complete", e->symtree->n.sym->name, &e->where);
2500 t = simplify_parameter_variable (e, 0);
2505 if (gfc_in_match_data ())
2510 if (e->symtree->n.sym->as)
2512 switch (e->symtree->n.sym->as->type)
2514 case AS_ASSUMED_SIZE:
2515 gfc_error ("Assumed size array '%s' at %L is not permitted "
2516 "in an initialization expression",
2517 e->symtree->n.sym->name, &e->where);
2520 case AS_ASSUMED_SHAPE:
2521 gfc_error ("Assumed shape array '%s' at %L is not permitted "
2522 "in an initialization expression",
2523 e->symtree->n.sym->name, &e->where);
2527 gfc_error ("Deferred array '%s' at %L is not permitted "
2528 "in an initialization expression",
2529 e->symtree->n.sym->name, &e->where);
2533 gfc_error ("Array '%s' at %L is a variable, which does "
2534 "not reduce to a constant expression",
2535 e->symtree->n.sym->name, &e->where);
2543 gfc_error ("Parameter '%s' at %L has not been declared or is "
2544 "a variable, which does not reduce to a constant "
2545 "expression", e->symtree->n.sym->name, &e->where);
2554 case EXPR_SUBSTRING:
2555 t = check_init_expr (e->ref->u.ss.start);
2559 t = check_init_expr (e->ref->u.ss.end);
2561 t = gfc_simplify_expr (e, 0);
2565 case EXPR_STRUCTURE:
2566 t = e->ts.is_iso_c ? SUCCESS : FAILURE;
2570 t = check_alloc_comp_init (e);
2574 t = gfc_check_constructor (e, check_init_expr);
2581 t = gfc_check_constructor (e, check_init_expr);
2585 t = gfc_expand_constructor (e, true);
2589 t = gfc_check_constructor_type (e);
2593 gfc_internal_error ("check_init_expr(): Unknown expression type");
2599 /* Reduces a general expression to an initialization expression (a constant).
2600 This used to be part of gfc_match_init_expr.
2601 Note that this function doesn't free the given expression on FAILURE. */
2604 gfc_reduce_init_expr (gfc_expr *expr)
2608 gfc_init_expr_flag = true;
2609 t = gfc_resolve_expr (expr);
2611 t = check_init_expr (expr);
2612 gfc_init_expr_flag = false;
2617 if (expr->expr_type == EXPR_ARRAY)
2619 if (gfc_check_constructor_type (expr) == FAILURE)
2621 if (gfc_expand_constructor (expr, true) == FAILURE)
2629 /* Match an initialization expression. We work by first matching an
2630 expression, then reducing it to a constant. */
2633 gfc_match_init_expr (gfc_expr **result)
2641 gfc_init_expr_flag = true;
2643 m = gfc_match_expr (&expr);
2646 gfc_init_expr_flag = false;
2650 t = gfc_reduce_init_expr (expr);
2653 gfc_free_expr (expr);
2654 gfc_init_expr_flag = false;
2659 gfc_init_expr_flag = false;
2665 /* Given an actual argument list, test to see that each argument is a
2666 restricted expression and optionally if the expression type is
2667 integer or character. */
2670 restricted_args (gfc_actual_arglist *a)
2672 for (; a; a = a->next)
2674 if (check_restricted (a->expr) == FAILURE)
2682 /************* Restricted/specification expressions *************/
2685 /* Make sure a non-intrinsic function is a specification function. */
2688 external_spec_function (gfc_expr *e)
2692 f = e->value.function.esym;
2694 if (f->attr.proc == PROC_ST_FUNCTION)
2696 gfc_error ("Specification function '%s' at %L cannot be a statement "
2697 "function", f->name, &e->where);
2701 if (f->attr.proc == PROC_INTERNAL)
2703 gfc_error ("Specification function '%s' at %L cannot be an internal "
2704 "function", f->name, &e->where);
2708 if (!f->attr.pure && !f->attr.elemental)
2710 gfc_error ("Specification function '%s' at %L must be PURE", f->name,
2715 if (f->attr.recursive)
2717 gfc_error ("Specification function '%s' at %L cannot be RECURSIVE",
2718 f->name, &e->where);
2722 return restricted_args (e->value.function.actual);
2726 /* Check to see that a function reference to an intrinsic is a
2727 restricted expression. */
2730 restricted_intrinsic (gfc_expr *e)
2732 /* TODO: Check constraints on inquiry functions. 7.1.6.2 (7). */
2733 if (check_inquiry (e, 0) == MATCH_YES)
2736 return restricted_args (e->value.function.actual);
2740 /* Check the expressions of an actual arglist. Used by check_restricted. */
2743 check_arglist (gfc_actual_arglist* arg, gfc_try (*checker) (gfc_expr*))
2745 for (; arg; arg = arg->next)
2746 if (checker (arg->expr) == FAILURE)
2753 /* Check the subscription expressions of a reference chain with a checking
2754 function; used by check_restricted. */
2757 check_references (gfc_ref* ref, gfc_try (*checker) (gfc_expr*))
2767 for (dim = 0; dim != ref->u.ar.dimen; ++dim)
2769 if (checker (ref->u.ar.start[dim]) == FAILURE)
2771 if (checker (ref->u.ar.end[dim]) == FAILURE)
2773 if (checker (ref->u.ar.stride[dim]) == FAILURE)
2779 /* Nothing needed, just proceed to next reference. */
2783 if (checker (ref->u.ss.start) == FAILURE)
2785 if (checker (ref->u.ss.end) == FAILURE)
2794 return check_references (ref->next, checker);
2798 /* Verify that an expression is a restricted expression. Like its
2799 cousin check_init_expr(), an error message is generated if we
2803 check_restricted (gfc_expr *e)
2811 switch (e->expr_type)
2814 t = check_intrinsic_op (e, check_restricted);
2816 t = gfc_simplify_expr (e, 0);
2821 if (e->value.function.esym)
2823 t = check_arglist (e->value.function.actual, &check_restricted);
2825 t = external_spec_function (e);
2829 if (e->value.function.isym && e->value.function.isym->inquiry)
2832 t = check_arglist (e->value.function.actual, &check_restricted);
2835 t = restricted_intrinsic (e);
2840 sym = e->symtree->n.sym;
2843 /* If a dummy argument appears in a context that is valid for a
2844 restricted expression in an elemental procedure, it will have
2845 already been simplified away once we get here. Therefore we
2846 don't need to jump through hoops to distinguish valid from
2848 if (sym->attr.dummy && sym->ns == gfc_current_ns
2849 && sym->ns->proc_name && sym->ns->proc_name->attr.elemental)
2851 gfc_error ("Dummy argument '%s' not allowed in expression at %L",
2852 sym->name, &e->where);
2856 if (sym->attr.optional)
2858 gfc_error ("Dummy argument '%s' at %L cannot be OPTIONAL",
2859 sym->name, &e->where);
2863 if (sym->attr.intent == INTENT_OUT)
2865 gfc_error ("Dummy argument '%s' at %L cannot be INTENT(OUT)",
2866 sym->name, &e->where);
2870 /* Check reference chain if any. */
2871 if (check_references (e->ref, &check_restricted) == FAILURE)
2874 /* gfc_is_formal_arg broadcasts that a formal argument list is being
2875 processed in resolve.c(resolve_formal_arglist). This is done so
2876 that host associated dummy array indices are accepted (PR23446).
2877 This mechanism also does the same for the specification expressions
2878 of array-valued functions. */
2880 || sym->attr.in_common
2881 || sym->attr.use_assoc
2883 || sym->attr.implied_index
2884 || sym->attr.flavor == FL_PARAMETER
2885 || (sym->ns && sym->ns == gfc_current_ns->parent)
2886 || (sym->ns && gfc_current_ns->parent
2887 && sym->ns == gfc_current_ns->parent->parent)
2888 || (sym->ns->proc_name != NULL
2889 && sym->ns->proc_name->attr.flavor == FL_MODULE)
2890 || (gfc_is_formal_arg () && (sym->ns == gfc_current_ns)))
2896 gfc_error ("Variable '%s' cannot appear in the expression at %L",
2897 sym->name, &e->where);
2898 /* Prevent a repetition of the error. */
2907 case EXPR_SUBSTRING:
2908 t = gfc_specification_expr (e->ref->u.ss.start);
2912 t = gfc_specification_expr (e->ref->u.ss.end);
2914 t = gfc_simplify_expr (e, 0);
2918 case EXPR_STRUCTURE:
2919 t = gfc_check_constructor (e, check_restricted);
2923 t = gfc_check_constructor (e, check_restricted);
2927 gfc_internal_error ("check_restricted(): Unknown expression type");
2934 /* Check to see that an expression is a specification expression. If
2935 we return FAILURE, an error has been generated. */
2938 gfc_specification_expr (gfc_expr *e)
2940 gfc_component *comp;
2945 if (e->ts.type != BT_INTEGER)
2947 gfc_error ("Expression at %L must be of INTEGER type, found %s",
2948 &e->where, gfc_basic_typename (e->ts.type));
2952 if (e->expr_type == EXPR_FUNCTION
2953 && !e->value.function.isym
2954 && !e->value.function.esym
2955 && !gfc_pure (e->symtree->n.sym)
2956 && (!gfc_is_proc_ptr_comp (e, &comp)
2957 || !comp->attr.pure))
2959 gfc_error ("Function '%s' at %L must be PURE",
2960 e->symtree->n.sym->name, &e->where);
2961 /* Prevent repeat error messages. */
2962 e->symtree->n.sym->attr.pure = 1;
2968 gfc_error ("Expression at %L must be scalar", &e->where);
2972 if (gfc_simplify_expr (e, 0) == FAILURE)
2975 return check_restricted (e);
2979 /************** Expression conformance checks. *************/
2981 /* Given two expressions, make sure that the arrays are conformable. */
2984 gfc_check_conformance (gfc_expr *op1, gfc_expr *op2, const char *optype_msgid, ...)
2986 int op1_flag, op2_flag, d;
2987 mpz_t op1_size, op2_size;
2993 if (op1->rank == 0 || op2->rank == 0)
2996 va_start (argp, optype_msgid);
2997 vsnprintf (buffer, 240, optype_msgid, argp);
3000 if (op1->rank != op2->rank)
3002 gfc_error ("Incompatible ranks in %s (%d and %d) at %L", _(buffer),
3003 op1->rank, op2->rank, &op1->where);
3009 for (d = 0; d < op1->rank; d++)
3011 op1_flag = gfc_array_dimen_size (op1, d, &op1_size) == SUCCESS;
3012 op2_flag = gfc_array_dimen_size (op2, d, &op2_size) == SUCCESS;
3014 if (op1_flag && op2_flag && mpz_cmp (op1_size, op2_size) != 0)
3016 gfc_error ("Different shape for %s at %L on dimension %d "
3017 "(%d and %d)", _(buffer), &op1->where, d + 1,
3018 (int) mpz_get_si (op1_size),
3019 (int) mpz_get_si (op2_size));
3025 mpz_clear (op1_size);
3027 mpz_clear (op2_size);
3037 /* Given an assignable expression and an arbitrary expression, make
3038 sure that the assignment can take place. */
3041 gfc_check_assign (gfc_expr *lvalue, gfc_expr *rvalue, int conform)
3047 sym = lvalue->symtree->n.sym;
3049 /* See if this is the component or subcomponent of a pointer. */
3050 has_pointer = sym->attr.pointer;
3051 for (ref = lvalue->ref; ref; ref = ref->next)
3052 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
3058 /* 12.5.2.2, Note 12.26: The result variable is very similar to any other
3059 variable local to a function subprogram. Its existence begins when
3060 execution of the function is initiated and ends when execution of the
3061 function is terminated...
3062 Therefore, the left hand side is no longer a variable, when it is: */
3063 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_ST_FUNCTION
3064 && !sym->attr.external)
3069 /* (i) Use associated; */
3070 if (sym->attr.use_assoc)
3073 /* (ii) The assignment is in the main program; or */
3074 if (gfc_current_ns->proc_name->attr.is_main_program)
3077 /* (iii) A module or internal procedure... */
3078 if ((gfc_current_ns->proc_name->attr.proc == PROC_INTERNAL
3079 || gfc_current_ns->proc_name->attr.proc == PROC_MODULE)
3080 && gfc_current_ns->parent
3081 && (!(gfc_current_ns->parent->proc_name->attr.function
3082 || gfc_current_ns->parent->proc_name->attr.subroutine)
3083 || gfc_current_ns->parent->proc_name->attr.is_main_program))
3085 /* ... that is not a function... */
3086 if (!gfc_current_ns->proc_name->attr.function)
3089 /* ... or is not an entry and has a different name. */
3090 if (!sym->attr.entry && sym->name != gfc_current_ns->proc_name->name)
3094 /* (iv) Host associated and not the function symbol or the
3095 parent result. This picks up sibling references, which
3096 cannot be entries. */
3097 if (!sym->attr.entry
3098 && sym->ns == gfc_current_ns->parent
3099 && sym != gfc_current_ns->proc_name
3100 && sym != gfc_current_ns->parent->proc_name->result)
3105 gfc_error ("'%s' at %L is not a VALUE", sym->name, &lvalue->where);
3110 if (rvalue->rank != 0 && lvalue->rank != rvalue->rank)
3112 gfc_error ("Incompatible ranks %d and %d in assignment at %L",
3113 lvalue->rank, rvalue->rank, &lvalue->where);
3117 if (lvalue->ts.type == BT_UNKNOWN)
3119 gfc_error ("Variable type is UNKNOWN in assignment at %L",
3124 if (rvalue->expr_type == EXPR_NULL)
3126 if (has_pointer && (ref == NULL || ref->next == NULL)
3127 && lvalue->symtree->n.sym->attr.data)
3131 gfc_error ("NULL appears on right-hand side in assignment at %L",
3137 /* This is possibly a typo: x = f() instead of x => f(). */
3138 if (gfc_option.warn_surprising
3139 && rvalue->expr_type == EXPR_FUNCTION
3140 && rvalue->symtree->n.sym->attr.pointer)
3141 gfc_warning ("POINTER valued function appears on right-hand side of "
3142 "assignment at %L", &rvalue->where);
3144 /* Check size of array assignments. */
3145 if (lvalue->rank != 0 && rvalue->rank != 0
3146 && gfc_check_conformance (lvalue, rvalue, "array assignment") != SUCCESS)
3149 if (rvalue->is_boz && lvalue->ts.type != BT_INTEGER
3150 && lvalue->symtree->n.sym->attr.data
3151 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L used to "
3152 "initialize non-integer variable '%s'",
3153 &rvalue->where, lvalue->symtree->n.sym->name)
3156 else if (rvalue->is_boz && !lvalue->symtree->n.sym->attr.data
3157 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
3158 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
3159 &rvalue->where) == FAILURE)
3162 /* Handle the case of a BOZ literal on the RHS. */
3163 if (rvalue->is_boz && lvalue->ts.type != BT_INTEGER)
3166 if (gfc_option.warn_surprising)
3167 gfc_warning ("BOZ literal at %L is bitwise transferred "
3168 "non-integer symbol '%s'", &rvalue->where,
3169 lvalue->symtree->n.sym->name);
3170 if (!gfc_convert_boz (rvalue, &lvalue->ts))
3172 if ((rc = gfc_range_check (rvalue)) != ARITH_OK)
3174 if (rc == ARITH_UNDERFLOW)
3175 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
3176 ". This check can be disabled with the option "
3177 "-fno-range-check", &rvalue->where);
3178 else if (rc == ARITH_OVERFLOW)
3179 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
3180 ". This check can be disabled with the option "
3181 "-fno-range-check", &rvalue->where);
3182 else if (rc == ARITH_NAN)
3183 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
3184 ". This check can be disabled with the option "
3185 "-fno-range-check", &rvalue->where);
3190 if (gfc_compare_types (&lvalue->ts, &rvalue->ts))
3193 /* Only DATA Statements come here. */
3196 /* Numeric can be converted to any other numeric. And Hollerith can be
3197 converted to any other type. */
3198 if ((gfc_numeric_ts (&lvalue->ts) && gfc_numeric_ts (&rvalue->ts))
3199 || rvalue->ts.type == BT_HOLLERITH)
3202 if (lvalue->ts.type == BT_LOGICAL && rvalue->ts.type == BT_LOGICAL)
3205 gfc_error ("Incompatible types in DATA statement at %L; attempted "
3206 "conversion of %s to %s", &lvalue->where,
3207 gfc_typename (&rvalue->ts), gfc_typename (&lvalue->ts));
3212 /* Assignment is the only case where character variables of different
3213 kind values can be converted into one another. */
3214 if (lvalue->ts.type == BT_CHARACTER && rvalue->ts.type == BT_CHARACTER)
3216 if (lvalue->ts.kind != rvalue->ts.kind)
3217 gfc_convert_chartype (rvalue, &lvalue->ts);
3222 return gfc_convert_type (rvalue, &lvalue->ts, 1);
3226 /* Check that a pointer assignment is OK. We first check lvalue, and
3227 we only check rvalue if it's not an assignment to NULL() or a
3228 NULLIFY statement. */
3231 gfc_check_pointer_assign (gfc_expr *lvalue, gfc_expr *rvalue)
3233 symbol_attribute attr;
3235 bool is_pure, is_implicit_pure, rank_remap;
3238 if (lvalue->symtree->n.sym->ts.type == BT_UNKNOWN
3239 && !lvalue->symtree->n.sym->attr.proc_pointer)
3241 gfc_error ("Pointer assignment target is not a POINTER at %L",
3246 if (lvalue->symtree->n.sym->attr.flavor == FL_PROCEDURE
3247 && lvalue->symtree->n.sym->attr.use_assoc
3248 && !lvalue->symtree->n.sym->attr.proc_pointer)
3250 gfc_error ("'%s' in the pointer assignment at %L cannot be an "
3251 "l-value since it is a procedure",
3252 lvalue->symtree->n.sym->name, &lvalue->where);
3256 proc_pointer = lvalue->symtree->n.sym->attr.proc_pointer;
3259 for (ref = lvalue->ref; ref; ref = ref->next)
3261 if (ref->type == REF_COMPONENT)
3262 proc_pointer = ref->u.c.component->attr.proc_pointer;
3264 if (ref->type == REF_ARRAY && ref->next == NULL)
3268 if (ref->u.ar.type == AR_FULL)
3271 if (ref->u.ar.type != AR_SECTION)
3273 gfc_error ("Expected bounds specification for '%s' at %L",
3274 lvalue->symtree->n.sym->name, &lvalue->where);
3278 if (gfc_notify_std (GFC_STD_F2003,"Fortran 2003: Bounds "
3279 "specification for '%s' in pointer assignment "
3280 "at %L", lvalue->symtree->n.sym->name,
3281 &lvalue->where) == FAILURE)
3284 /* When bounds are given, all lbounds are necessary and either all
3285 or none of the upper bounds; no strides are allowed. If the
3286 upper bounds are present, we may do rank remapping. */
3287 for (dim = 0; dim < ref->u.ar.dimen; ++dim)
3289 if (!ref->u.ar.start[dim]
3290 || ref->u.ar.dimen_type[dim] != DIMEN_RANGE)
3292 gfc_error ("Lower bound has to be present at %L",
3296 if (ref->u.ar.stride[dim])
3298 gfc_error ("Stride must not be present at %L",
3304 rank_remap = (ref->u.ar.end[dim] != NULL);
3307 if ((rank_remap && !ref->u.ar.end[dim])
3308 || (!rank_remap && ref->u.ar.end[dim]))
3310 gfc_error ("Either all or none of the upper bounds"
3311 " must be specified at %L", &lvalue->where);
3319 is_pure = gfc_pure (NULL);
3320 is_implicit_pure = gfc_implicit_pure (NULL);
3322 /* If rvalue is a NULL() or NULLIFY, we're done. Otherwise the type,
3323 kind, etc for lvalue and rvalue must match, and rvalue must be a
3324 pure variable if we're in a pure function. */
3325 if (rvalue->expr_type == EXPR_NULL && rvalue->ts.type == BT_UNKNOWN)
3328 /* F2008, C723 (pointer) and C726 (proc-pointer); for PURE also C1283. */
3329 if (lvalue->expr_type == EXPR_VARIABLE
3330 && gfc_is_coindexed (lvalue))
3333 for (ref = lvalue->ref; ref; ref = ref->next)
3334 if (ref->type == REF_ARRAY && ref->u.ar.codimen)
3336 gfc_error ("Pointer object at %L shall not have a coindex",
3342 /* Checks on rvalue for procedure pointer assignments. */
3347 gfc_component *comp;
3350 attr = gfc_expr_attr (rvalue);
3351 if (!((rvalue->expr_type == EXPR_NULL)
3352 || (rvalue->expr_type == EXPR_FUNCTION && attr.proc_pointer)
3353 || (rvalue->expr_type == EXPR_VARIABLE && attr.proc_pointer)
3354 || (rvalue->expr_type == EXPR_VARIABLE
3355 && attr.flavor == FL_PROCEDURE)))
3357 gfc_error ("Invalid procedure pointer assignment at %L",
3363 gfc_error ("Abstract interface '%s' is invalid "
3364 "in procedure pointer assignment at %L",
3365 rvalue->symtree->name, &rvalue->where);
3368 /* Check for C727. */
3369 if (attr.flavor == FL_PROCEDURE)
3371 if (attr.proc == PROC_ST_FUNCTION)
3373 gfc_error ("Statement function '%s' is invalid "
3374 "in procedure pointer assignment at %L",
3375 rvalue->symtree->name, &rvalue->where);
3378 if (attr.proc == PROC_INTERNAL &&
3379 gfc_notify_std (GFC_STD_F2008, "Internal procedure '%s' is "
3380 "invalid in procedure pointer assignment at %L",
3381 rvalue->symtree->name, &rvalue->where) == FAILURE)
3385 /* Ensure that the calling convention is the same. As other attributes
3386 such as DLLEXPORT may differ, one explicitly only tests for the
3387 calling conventions. */
3388 if (rvalue->expr_type == EXPR_VARIABLE
3389 && lvalue->symtree->n.sym->attr.ext_attr
3390 != rvalue->symtree->n.sym->attr.ext_attr)
3392 symbol_attribute calls;
3395 gfc_add_ext_attribute (&calls, EXT_ATTR_CDECL, NULL);
3396 gfc_add_ext_attribute (&calls, EXT_ATTR_STDCALL, NULL);
3397 gfc_add_ext_attribute (&calls, EXT_ATTR_FASTCALL, NULL);
3399 if ((calls.ext_attr & lvalue->symtree->n.sym->attr.ext_attr)
3400 != (calls.ext_attr & rvalue->symtree->n.sym->attr.ext_attr))
3402 gfc_error ("Mismatch in the procedure pointer assignment "
3403 "at %L: mismatch in the calling convention",
3409 if (gfc_is_proc_ptr_comp (lvalue, &comp))
3410 s1 = comp->ts.interface;
3412 s1 = lvalue->symtree->n.sym;
3414 if (gfc_is_proc_ptr_comp (rvalue, &comp))
3416 s2 = comp->ts.interface;
3419 else if (rvalue->expr_type == EXPR_FUNCTION)
3421 s2 = rvalue->symtree->n.sym->result;
3422 name = rvalue->symtree->n.sym->result->name;
3426 s2 = rvalue->symtree->n.sym;
3427 name = rvalue->symtree->n.sym->name;
3430 if (s1 && s2 && !gfc_compare_interfaces (s1, s2, name, 0, 1,
3433 gfc_error ("Interface mismatch in procedure pointer assignment "
3434 "at %L: %s", &rvalue->where, err);
3441 if (!gfc_compare_types (&lvalue->ts, &rvalue->ts))
3443 gfc_error ("Different types in pointer assignment at %L; attempted "
3444 "assignment of %s to %s", &lvalue->where,
3445 gfc_typename (&rvalue->ts), gfc_typename (&lvalue->ts));
3449 if (lvalue->ts.type != BT_CLASS && lvalue->ts.kind != rvalue->ts.kind)
3451 gfc_error ("Different kind type parameters in pointer "
3452 "assignment at %L", &lvalue->where);
3456 if (lvalue->rank != rvalue->rank && !rank_remap)
3458 gfc_error ("Different ranks in pointer assignment at %L", &lvalue->where);
3462 if (lvalue->ts.type == BT_CLASS && rvalue->ts.type == BT_DERIVED)
3463 /* Make sure the vtab is present. */
3464 gfc_find_derived_vtab (rvalue->ts.u.derived);
3466 /* Check rank remapping. */
3471 /* If this can be determined, check that the target must be at least as
3472 large as the pointer assigned to it is. */
3473 if (gfc_array_size (lvalue, &lsize) == SUCCESS
3474 && gfc_array_size (rvalue, &rsize) == SUCCESS
3475 && mpz_cmp (rsize, lsize) < 0)
3477 gfc_error ("Rank remapping target is smaller than size of the"
3478 " pointer (%ld < %ld) at %L",
3479 mpz_get_si (rsize), mpz_get_si (lsize),
3484 /* The target must be either rank one or it must be simply contiguous
3485 and F2008 must be allowed. */
3486 if (rvalue->rank != 1)
3488 if (!gfc_is_simply_contiguous (rvalue, true))
3490 gfc_error ("Rank remapping target must be rank 1 or"
3491 " simply contiguous at %L", &rvalue->where);
3494 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Rank remapping"
3495 " target is not rank 1 at %L", &rvalue->where)
3501 /* Now punt if we are dealing with a NULLIFY(X) or X = NULL(X). */
3502 if (rvalue->expr_type == EXPR_NULL)
3505 if (lvalue->ts.type == BT_CHARACTER)
3507 gfc_try t = gfc_check_same_strlen (lvalue, rvalue, "pointer assignment");
3512 if (rvalue->expr_type == EXPR_VARIABLE && is_subref_array (rvalue))
3513 lvalue->symtree->n.sym->attr.subref_array_pointer = 1;
3515 attr = gfc_expr_attr (rvalue);
3517 if (rvalue->expr_type == EXPR_FUNCTION && !attr.pointer)
3519 gfc_error ("Target expression in pointer assignment "
3520 "at %L must deliver a pointer result",
3525 if (!attr.target && !attr.pointer)
3527 gfc_error ("Pointer assignment target is neither TARGET "
3528 "nor POINTER at %L", &rvalue->where);
3532 if (is_pure && gfc_impure_variable (rvalue->symtree->n.sym))
3534 gfc_error ("Bad target in pointer assignment in PURE "
3535 "procedure at %L", &rvalue->where);
3538 if (is_implicit_pure && gfc_impure_variable (rvalue->symtree->n.sym))
3539 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3542 if (gfc_has_vector_index (rvalue))
3544 gfc_error ("Pointer assignment with vector subscript "
3545 "on rhs at %L", &rvalue->where);
3549 if (attr.is_protected && attr.use_assoc
3550 && !(attr.pointer || attr.proc_pointer))
3552 gfc_error ("Pointer assignment target has PROTECTED "
3553 "attribute at %L", &rvalue->where);
3557 /* F2008, C725. For PURE also C1283. */
3558 if (rvalue->expr_type == EXPR_VARIABLE
3559 && gfc_is_coindexed (rvalue))
3562 for (ref = rvalue->ref; ref; ref = ref->next)
3563 if (ref->type == REF_ARRAY && ref->u.ar.codimen)
3565 gfc_error ("Data target at %L shall not have a coindex",
3575 /* Relative of gfc_check_assign() except that the lvalue is a single
3576 symbol. Used for initialization assignments. */
3579 gfc_check_assign_symbol (gfc_symbol *sym, gfc_expr *rvalue)
3584 memset (&lvalue, '\0', sizeof (gfc_expr));
3586 lvalue.expr_type = EXPR_VARIABLE;
3587 lvalue.ts = sym->ts;
3589 lvalue.rank = sym->as->rank;
3590 lvalue.symtree = XCNEW (gfc_symtree);
3591 lvalue.symtree->n.sym = sym;
3592 lvalue.where = sym->declared_at;
3594 if (sym->attr.pointer || sym->attr.proc_pointer
3595 || (sym->ts.type == BT_CLASS && CLASS_DATA (sym)->attr.class_pointer
3596 && rvalue->expr_type == EXPR_NULL))
3597 r = gfc_check_pointer_assign (&lvalue, rvalue);
3599 r = gfc_check_assign (&lvalue, rvalue, 1);
3601 free (lvalue.symtree);
3606 if (sym->attr.pointer && rvalue->expr_type != EXPR_NULL)
3608 /* F08:C461. Additional checks for pointer initialization. */
3609 symbol_attribute attr;
3610 attr = gfc_expr_attr (rvalue);
3611 if (attr.allocatable)
3613 gfc_error ("Pointer initialization target at %C "
3614 "must not be ALLOCATABLE ");
3617 if (!attr.target || attr.pointer)
3619 gfc_error ("Pointer initialization target at %C "
3620 "must have the TARGET attribute");
3625 gfc_error ("Pointer initialization target at %C "
3626 "must have the SAVE attribute");
3631 if (sym->attr.proc_pointer && rvalue->expr_type != EXPR_NULL)
3633 /* F08:C1220. Additional checks for procedure pointer initialization. */
3634 symbol_attribute attr = gfc_expr_attr (rvalue);
3635 if (attr.proc_pointer)
3637 gfc_error ("Procedure pointer initialization target at %L "
3638 "may not be a procedure pointer", &rvalue->where);
3647 /* Check for default initializer; sym->value is not enough
3648 as it is also set for EXPR_NULL of allocatables. */
3651 gfc_has_default_initializer (gfc_symbol *der)
3655 gcc_assert (der->attr.flavor == FL_DERIVED);
3656 for (c = der->components; c; c = c->next)
3657 if (c->ts.type == BT_DERIVED)
3659 if (!c->attr.pointer
3660 && gfc_has_default_initializer (c->ts.u.derived))
3672 /* Get an expression for a default initializer. */
3675 gfc_default_initializer (gfc_typespec *ts)
3678 gfc_component *comp;
3680 /* See if we have a default initializer in this, but not in nested
3681 types (otherwise we could use gfc_has_default_initializer()). */
3682 for (comp = ts->u.derived->components; comp; comp = comp->next)
3683 if (comp->initializer || comp->attr.allocatable
3684 || (comp->ts.type == BT_CLASS && CLASS_DATA (comp)->attr.allocatable))
3690 init = gfc_get_structure_constructor_expr (ts->type, ts->kind,
3691 &ts->u.derived->declared_at);
3694 for (comp = ts->u.derived->components; comp; comp = comp->next)
3696 gfc_constructor *ctor = gfc_constructor_get();
3698 if (comp->initializer)
3699 ctor->expr = gfc_copy_expr (comp->initializer);
3701 if (comp->attr.allocatable
3702 || (comp->ts.type == BT_CLASS && CLASS_DATA (comp)->attr.allocatable))
3704 ctor->expr = gfc_get_expr ();
3705 ctor->expr->expr_type = EXPR_NULL;
3706 ctor->expr->ts = comp->ts;
3709 gfc_constructor_append (&init->value.constructor, ctor);
3716 /* Given a symbol, create an expression node with that symbol as a
3717 variable. If the symbol is array valued, setup a reference of the
3721 gfc_get_variable_expr (gfc_symtree *var)
3725 e = gfc_get_expr ();
3726 e->expr_type = EXPR_VARIABLE;
3728 e->ts = var->n.sym->ts;
3730 if (var->n.sym->as != NULL)
3732 e->rank = var->n.sym->as->rank;
3733 e->ref = gfc_get_ref ();
3734 e->ref->type = REF_ARRAY;
3735 e->ref->u.ar.type = AR_FULL;
3743 gfc_lval_expr_from_sym (gfc_symbol *sym)
3746 lval = gfc_get_expr ();
3747 lval->expr_type = EXPR_VARIABLE;
3748 lval->where = sym->declared_at;
3750 lval->symtree = gfc_find_symtree (sym->ns->sym_root, sym->name);
3752 /* It will always be a full array. */
3753 lval->rank = sym->as ? sym->as->rank : 0;
3756 lval->ref = gfc_get_ref ();
3757 lval->ref->type = REF_ARRAY;
3758 lval->ref->u.ar.type = AR_FULL;
3759 lval->ref->u.ar.dimen = lval->rank;
3760 lval->ref->u.ar.where = sym->declared_at;
3761 lval->ref->u.ar.as = sym->as;
3768 /* Returns the array_spec of a full array expression. A NULL is
3769 returned otherwise. */
3771 gfc_get_full_arrayspec_from_expr (gfc_expr *expr)
3776 if (expr->rank == 0)
3779 /* Follow any component references. */
3780 if (expr->expr_type == EXPR_VARIABLE
3781 || expr->expr_type == EXPR_CONSTANT)
3783 as = expr->symtree->n.sym->as;
3784 for (ref = expr->ref; ref; ref = ref->next)
3789 as = ref->u.c.component->as;
3797 switch (ref->u.ar.type)
3820 /* General expression traversal function. */
3823 gfc_traverse_expr (gfc_expr *expr, gfc_symbol *sym,
3824 bool (*func)(gfc_expr *, gfc_symbol *, int*),
3829 gfc_actual_arglist *args;
3836 if ((*func) (expr, sym, &f))
3839 if (expr->ts.type == BT_CHARACTER
3841 && expr->ts.u.cl->length
3842 && expr->ts.u.cl->length->expr_type != EXPR_CONSTANT
3843 && gfc_traverse_expr (expr->ts.u.cl->length, sym, func, f))
3846 switch (expr->expr_type)
3851 for (args = expr->value.function.actual; args; args = args->next)
3853 if (gfc_traverse_expr (args->expr, sym, func, f))
3861 case EXPR_SUBSTRING:
3864 case EXPR_STRUCTURE:
3866 for (c = gfc_constructor_first (expr->value.constructor);
3867 c; c = gfc_constructor_next (c))
3869 if (gfc_traverse_expr (c->expr, sym, func, f))
3873 if (gfc_traverse_expr (c->iterator->var, sym, func, f))
3875 if (gfc_traverse_expr (c->iterator->start, sym, func, f))
3877 if (gfc_traverse_expr (c->iterator->end, sym, func, f))
3879 if (gfc_traverse_expr (c->iterator->step, sym, func, f))
3886 if (gfc_traverse_expr (expr->value.op.op1, sym, func, f))
3888 if (gfc_traverse_expr (expr->value.op.op2, sym, func, f))
3904 for (i = 0; i < GFC_MAX_DIMENSIONS; i++)
3906 if (gfc_traverse_expr (ar.start[i], sym, func, f))
3908 if (gfc_traverse_expr (ar.end[i], sym, func, f))
3910 if (gfc_traverse_expr (ar.stride[i], sym, func, f))
3916 if (gfc_traverse_expr (ref->u.ss.start, sym, func, f))
3918 if (gfc_traverse_expr (ref->u.ss.end, sym, func, f))
3923 if (ref->u.c.component->ts.type == BT_CHARACTER
3924 && ref->u.c.component->ts.u.cl
3925 && ref->u.c.component->ts.u.cl->length
3926 && ref->u.c.component->ts.u.cl->length->expr_type
3928 && gfc_traverse_expr (ref->u.c.component->ts.u.cl->length,
3932 if (ref->u.c.component->as)
3933 for (i = 0; i < ref->u.c.component->as->rank
3934 + ref->u.c.component->as->corank; i++)
3936 if (gfc_traverse_expr (ref->u.c.component->as->lower[i],
3939 if (gfc_traverse_expr (ref->u.c.component->as->upper[i],
3953 /* Traverse expr, marking all EXPR_VARIABLE symbols referenced. */
3956 expr_set_symbols_referenced (gfc_expr *expr,
3957 gfc_symbol *sym ATTRIBUTE_UNUSED,
3958 int *f ATTRIBUTE_UNUSED)
3960 if (expr->expr_type != EXPR_VARIABLE)
3962 gfc_set_sym_referenced (expr->symtree->n.sym);
3967 gfc_expr_set_symbols_referenced (gfc_expr *expr)
3969 gfc_traverse_expr (expr, NULL, expr_set_symbols_referenced, 0);
3973 /* Determine if an expression is a procedure pointer component. If yes, the
3974 argument 'comp' will point to the component (provided that 'comp' was
3978 gfc_is_proc_ptr_comp (gfc_expr *expr, gfc_component **comp)
3983 if (!expr || !expr->ref)
3990 if (ref->type == REF_COMPONENT)
3992 ppc = ref->u.c.component->attr.proc_pointer;
3994 *comp = ref->u.c.component;
4001 /* Walk an expression tree and check each variable encountered for being typed.
4002 If strict is not set, a top-level variable is tolerated untyped in -std=gnu
4003 mode as is a basic arithmetic expression using those; this is for things in
4006 INTEGER :: arr(n), n
4007 INTEGER :: arr(n + 1), n
4009 The namespace is needed for IMPLICIT typing. */
4011 static gfc_namespace* check_typed_ns;
4014 expr_check_typed_help (gfc_expr* e, gfc_symbol* sym ATTRIBUTE_UNUSED,
4015 int* f ATTRIBUTE_UNUSED)
4019 if (e->expr_type != EXPR_VARIABLE)
4022 gcc_assert (e->symtree);
4023 t = gfc_check_symbol_typed (e->symtree->n.sym, check_typed_ns,
4026 return (t == FAILURE);
4030 gfc_expr_check_typed (gfc_expr* e, gfc_namespace* ns, bool strict)
4034 /* If this is a top-level variable or EXPR_OP, do the check with strict given
4038 if (e->expr_type == EXPR_VARIABLE && !e->ref)
4039 return gfc_check_symbol_typed (e->symtree->n.sym, ns, strict, e->where);
4041 if (e->expr_type == EXPR_OP)
4043 gfc_try t = SUCCESS;
4045 gcc_assert (e->value.op.op1);
4046 t = gfc_expr_check_typed (e->value.op.op1, ns, strict);
4048 if (t == SUCCESS && e->value.op.op2)
4049 t = gfc_expr_check_typed (e->value.op.op2, ns, strict);
4055 /* Otherwise, walk the expression and do it strictly. */
4056 check_typed_ns = ns;
4057 error_found = gfc_traverse_expr (e, NULL, &expr_check_typed_help, 0);
4059 return error_found ? FAILURE : SUCCESS;
4062 /* Walk an expression tree and replace all symbols with a corresponding symbol
4063 in the formal_ns of "sym". Needed for copying interfaces in PROCEDURE
4064 statements. The boolean return value is required by gfc_traverse_expr. */
4067 replace_symbol (gfc_expr *expr, gfc_symbol *sym, int *i ATTRIBUTE_UNUSED)
4069 if ((expr->expr_type == EXPR_VARIABLE
4070 || (expr->expr_type == EXPR_FUNCTION
4071 && !gfc_is_intrinsic (expr->symtree->n.sym, 0, expr->where)))
4072 && expr->symtree->n.sym->ns == sym->ts.interface->formal_ns)
4075 gfc_namespace *ns = sym->formal_ns;
4076 /* Don't use gfc_get_symtree as we prefer to fail badly if we don't find
4077 the symtree rather than create a new one (and probably fail later). */
4078 stree = gfc_find_symtree (ns ? ns->sym_root : gfc_current_ns->sym_root,
4079 expr->symtree->n.sym->name);
4081 stree->n.sym->attr = expr->symtree->n.sym->attr;
4082 expr->symtree = stree;
4088 gfc_expr_replace_symbols (gfc_expr *expr, gfc_symbol *dest)
4090 gfc_traverse_expr (expr, dest, &replace_symbol, 0);
4093 /* The following is analogous to 'replace_symbol', and needed for copying
4094 interfaces for procedure pointer components. The argument 'sym' must formally
4095 be a gfc_symbol, so that the function can be passed to gfc_traverse_expr.
4096 However, it gets actually passed a gfc_component (i.e. the procedure pointer
4097 component in whose formal_ns the arguments have to be). */
4100 replace_comp (gfc_expr *expr, gfc_symbol *sym, int *i ATTRIBUTE_UNUSED)
4102 gfc_component *comp;
4103 comp = (gfc_component *)sym;
4104 if ((expr->expr_type == EXPR_VARIABLE
4105 || (expr->expr_type == EXPR_FUNCTION
4106 && !gfc_is_intrinsic (expr->symtree->n.sym, 0, expr->where)))
4107 && expr->symtree->n.sym->ns == comp->ts.interface->formal_ns)
4110 gfc_namespace *ns = comp->formal_ns;
4111 /* Don't use gfc_get_symtree as we prefer to fail badly if we don't find
4112 the symtree rather than create a new one (and probably fail later). */
4113 stree = gfc_find_symtree (ns ? ns->sym_root : gfc_current_ns->sym_root,
4114 expr->symtree->n.sym->name);
4116 stree->n.sym->attr = expr->symtree->n.sym->attr;
4117 expr->symtree = stree;
4123 gfc_expr_replace_comp (gfc_expr *expr, gfc_component *dest)
4125 gfc_traverse_expr (expr, (gfc_symbol *)dest, &replace_comp, 0);
4130 gfc_ref_this_image (gfc_ref *ref)
4134 gcc_assert (ref->type == REF_ARRAY && ref->u.ar.codimen > 0);
4136 for (n = ref->u.ar.dimen; n < ref->u.ar.dimen + ref->u.ar.codimen; n++)
4137 if (ref->u.ar.dimen_type[n] != DIMEN_THIS_IMAGE)
4145 gfc_is_coindexed (gfc_expr *e)
4149 for (ref = e->ref; ref; ref = ref->next)
4150 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
4151 return !gfc_ref_this_image (ref);
4158 gfc_get_corank (gfc_expr *e)
4162 corank = e->symtree->n.sym->as ? e->symtree->n.sym->as->corank : 0;
4163 for (ref = e->ref; ref; ref = ref->next)
4165 if (ref->type == REF_ARRAY)
4166 corank = ref->u.ar.as->corank;
4167 gcc_assert (ref->type != REF_SUBSTRING);
4173 /* Check whether the expression has an ultimate allocatable component.
4174 Being itself allocatable does not count. */
4176 gfc_has_ultimate_allocatable (gfc_expr *e)
4178 gfc_ref *ref, *last = NULL;
4180 if (e->expr_type != EXPR_VARIABLE)
4183 for (ref = e->ref; ref; ref = ref->next)
4184 if (ref->type == REF_COMPONENT)
4187 if (last && last->u.c.component->ts.type == BT_CLASS)
4188 return CLASS_DATA (last->u.c.component)->attr.alloc_comp;
4189 else if (last && last->u.c.component->ts.type == BT_DERIVED)
4190 return last->u.c.component->ts.u.derived->attr.alloc_comp;
4194 if (e->ts.type == BT_CLASS)
4195 return CLASS_DATA (e)->attr.alloc_comp;
4196 else if (e->ts.type == BT_DERIVED)
4197 return e->ts.u.derived->attr.alloc_comp;
4203 /* Check whether the expression has an pointer component.
4204 Being itself a pointer does not count. */
4206 gfc_has_ultimate_pointer (gfc_expr *e)
4208 gfc_ref *ref, *last = NULL;
4210 if (e->expr_type != EXPR_VARIABLE)
4213 for (ref = e->ref; ref; ref = ref->next)
4214 if (ref->type == REF_COMPONENT)
4217 if (last && last->u.c.component->ts.type == BT_CLASS)
4218 return CLASS_DATA (last->u.c.component)->attr.pointer_comp;
4219 else if (last && last->u.c.component->ts.type == BT_DERIVED)
4220 return last->u.c.component->ts.u.derived->attr.pointer_comp;
4224 if (e->ts.type == BT_CLASS)
4225 return CLASS_DATA (e)->attr.pointer_comp;
4226 else if (e->ts.type == BT_DERIVED)
4227 return e->ts.u.derived->attr.pointer_comp;
4233 /* Check whether an expression is "simply contiguous", cf. F2008, 6.5.4.
4234 Note: A scalar is not regarded as "simply contiguous" by the standard.
4235 if bool is not strict, some futher checks are done - for instance,
4236 a "(::1)" is accepted. */
4239 gfc_is_simply_contiguous (gfc_expr *expr, bool strict)
4243 gfc_array_ref *ar = NULL;
4244 gfc_ref *ref, *part_ref = NULL;
4246 if (expr->expr_type == EXPR_FUNCTION)
4247 return expr->value.function.esym
4248 ? expr->value.function.esym->result->attr.contiguous : false;
4249 else if (expr->expr_type != EXPR_VARIABLE)
4252 if (expr->rank == 0)
4255 for (ref = expr->ref; ref; ref = ref->next)
4258 return false; /* Array shall be last part-ref. */
4260 if (ref->type == REF_COMPONENT)
4262 else if (ref->type == REF_SUBSTRING)
4264 else if (ref->u.ar.type != AR_ELEMENT)
4268 if ((part_ref && !part_ref->u.c.component->attr.contiguous
4269 && part_ref->u.c.component->attr.pointer)
4270 || (!part_ref && !expr->symtree->n.sym->attr.contiguous
4271 && (expr->symtree->n.sym->attr.pointer
4272 || expr->symtree->n.sym->as->type == AS_ASSUMED_SHAPE)))
4275 if (!ar || ar->type == AR_FULL)
4278 gcc_assert (ar->type == AR_SECTION);
4280 /* Check for simply contiguous array */
4282 for (i = 0; i < ar->dimen; i++)
4284 if (ar->dimen_type[i] == DIMEN_VECTOR)
4287 if (ar->dimen_type[i] == DIMEN_ELEMENT)
4293 gcc_assert (ar->dimen_type[i] == DIMEN_RANGE);
4296 /* If the previous section was not contiguous, that's an error,
4297 unless we have effective only one element and checking is not
4299 if (!colon && (strict || !ar->start[i] || !ar->end[i]
4300 || ar->start[i]->expr_type != EXPR_CONSTANT
4301 || ar->end[i]->expr_type != EXPR_CONSTANT
4302 || mpz_cmp (ar->start[i]->value.integer,
4303 ar->end[i]->value.integer) != 0))
4306 /* Following the standard, "(::1)" or - if known at compile time -
4307 "(lbound:ubound)" are not simply contigous; if strict
4308 is false, they are regarded as simply contiguous. */
4309 if (ar->stride[i] && (strict || ar->stride[i]->expr_type != EXPR_CONSTANT
4310 || ar->stride[i]->ts.type != BT_INTEGER
4311 || mpz_cmp_si (ar->stride[i]->value.integer, 1) != 0))
4315 && (strict || ar->start[i]->expr_type != EXPR_CONSTANT
4316 || !ar->as->lower[i]
4317 || ar->as->lower[i]->expr_type != EXPR_CONSTANT
4318 || mpz_cmp (ar->start[i]->value.integer,
4319 ar->as->lower[i]->value.integer) != 0))
4323 && (strict || ar->end[i]->expr_type != EXPR_CONSTANT
4324 || !ar->as->upper[i]
4325 || ar->as->upper[i]->expr_type != EXPR_CONSTANT
4326 || mpz_cmp (ar->end[i]->value.integer,
4327 ar->as->upper[i]->value.integer) != 0))
4335 /* Build call to an intrinsic procedure. The number of arguments has to be
4336 passed (rather than ending the list with a NULL value) because we may
4337 want to add arguments but with a NULL-expression. */
4340 gfc_build_intrinsic_call (const char* name, locus where, unsigned numarg, ...)
4343 gfc_actual_arglist* atail;
4344 gfc_intrinsic_sym* isym;
4348 isym = gfc_find_function (name);
4351 result = gfc_get_expr ();
4352 result->expr_type = EXPR_FUNCTION;
4353 result->ts = isym->ts;
4354 result->where = where;
4355 result->value.function.name = name;
4356 result->value.function.isym = isym;
4358 va_start (ap, numarg);
4360 for (i = 0; i < numarg; ++i)
4364 atail->next = gfc_get_actual_arglist ();
4365 atail = atail->next;
4368 atail = result->value.function.actual = gfc_get_actual_arglist ();
4370 atail->expr = va_arg (ap, gfc_expr*);
4378 /* Check if an expression may appear in a variable definition context
4379 (F2008, 16.6.7) or pointer association context (F2008, 16.6.8).
4380 This is called from the various places when resolving
4381 the pieces that make up such a context.
4383 Optionally, a possible error message can be suppressed if context is NULL
4384 and just the return status (SUCCESS / FAILURE) be requested. */
4387 gfc_check_vardef_context (gfc_expr* e, bool pointer, bool alloc_obj,
4388 const char* context)
4390 gfc_symbol* sym = NULL;
4392 bool check_intentin;
4394 symbol_attribute attr;
4397 if (e->expr_type == EXPR_VARIABLE)
4399 gcc_assert (e->symtree);
4400 sym = e->symtree->n.sym;
4402 else if (e->expr_type == EXPR_FUNCTION)
4404 gcc_assert (e->symtree);
4405 sym = e->value.function.esym ? e->value.function.esym : e->symtree->n.sym;
4408 attr = gfc_expr_attr (e);
4409 if (!pointer && e->expr_type == EXPR_FUNCTION && attr.pointer)
4411 if (!(gfc_option.allow_std & GFC_STD_F2008))
4414 gfc_error ("Fortran 2008: Pointer functions in variable definition"
4415 " context (%s) at %L", context, &e->where);
4419 else if (e->expr_type != EXPR_VARIABLE)
4422 gfc_error ("Non-variable expression in variable definition context (%s)"
4423 " at %L", context, &e->where);
4427 if (!pointer && sym->attr.flavor == FL_PARAMETER)
4430 gfc_error ("Named constant '%s' in variable definition context (%s)"
4431 " at %L", sym->name, context, &e->where);
4434 if (!pointer && sym->attr.flavor != FL_VARIABLE
4435 && !(sym->attr.flavor == FL_PROCEDURE && sym == sym->result)
4436 && !(sym->attr.flavor == FL_PROCEDURE && sym->attr.proc_pointer))
4439 gfc_error ("'%s' in variable definition context (%s) at %L is not"
4440 " a variable", sym->name, context, &e->where);
4444 /* Find out whether the expr is a pointer; this also means following
4445 component references to the last one. */
4446 is_pointer = (attr.pointer || attr.proc_pointer);
4447 if (pointer && !is_pointer)
4450 gfc_error ("Non-POINTER in pointer association context (%s)"
4451 " at %L", context, &e->where);
4458 || (e->ts.type == BT_DERIVED
4459 && e->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
4460 && e->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE)))
4463 gfc_error ("LOCK_TYPE in variable definition context (%s) at %L",
4464 context, &e->where);
4468 /* INTENT(IN) dummy argument. Check this, unless the object itself is
4469 the component of sub-component of a pointer. Obviously,
4470 procedure pointers are of no interest here. */
4471 check_intentin = true;
4472 ptr_component = sym->attr.pointer;
4473 for (ref = e->ref; ref && check_intentin; ref = ref->next)
4475 if (ptr_component && ref->type == REF_COMPONENT)
4476 check_intentin = false;
4477 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
4478 ptr_component = true;
4480 if (check_intentin && sym->attr.intent == INTENT_IN)
4482 if (pointer && is_pointer)
4485 gfc_error ("Dummy argument '%s' with INTENT(IN) in pointer"
4486 " association context (%s) at %L",
4487 sym->name, context, &e->where);
4490 if (!pointer && !is_pointer)
4493 gfc_error ("Dummy argument '%s' with INTENT(IN) in variable"
4494 " definition context (%s) at %L",
4495 sym->name, context, &e->where);
4500 /* PROTECTED and use-associated. */
4501 if (sym->attr.is_protected && sym->attr.use_assoc && check_intentin)
4503 if (pointer && is_pointer)
4506 gfc_error ("Variable '%s' is PROTECTED and can not appear in a"
4507 " pointer association context (%s) at %L",
4508 sym->name, context, &e->where);
4511 if (!pointer && !is_pointer)
4514 gfc_error ("Variable '%s' is PROTECTED and can not appear in a"
4515 " variable definition context (%s) at %L",
4516 sym->name, context, &e->where);
4521 /* Variable not assignable from a PURE procedure but appears in
4522 variable definition context. */
4523 if (!pointer && gfc_pure (NULL) && gfc_impure_variable (sym))
4526 gfc_error ("Variable '%s' can not appear in a variable definition"
4527 " context (%s) at %L in PURE procedure",
4528 sym->name, context, &e->where);
4532 if (!pointer && gfc_implicit_pure (NULL) && gfc_impure_variable (sym))
4533 gfc_current_ns->proc_name->attr.implicit_pure = 0;
4535 /* Check variable definition context for associate-names. */
4536 if (!pointer && sym->assoc)
4539 gfc_association_list* assoc;
4541 gcc_assert (sym->assoc->target);
4543 /* If this is a SELECT TYPE temporary (the association is used internally
4544 for SELECT TYPE), silently go over to the target. */
4545 if (sym->attr.select_type_temporary)
4547 gfc_expr* t = sym->assoc->target;
4549 gcc_assert (t->expr_type == EXPR_VARIABLE);
4550 name = t->symtree->name;
4552 if (t->symtree->n.sym->assoc)
4553 assoc = t->symtree->n.sym->assoc;
4562 gcc_assert (name && assoc);
4564 /* Is association to a valid variable? */
4565 if (!assoc->variable)
4569 if (assoc->target->expr_type == EXPR_VARIABLE)
4570 gfc_error ("'%s' at %L associated to vector-indexed target can"
4571 " not be used in a variable definition context (%s)",
4572 name, &e->where, context);
4574 gfc_error ("'%s' at %L associated to expression can"
4575 " not be used in a variable definition context (%s)",
4576 name, &e->where, context);
4581 /* Target must be allowed to appear in a variable definition context. */
4582 if (gfc_check_vardef_context (assoc->target, pointer, false, NULL)
4586 gfc_error ("Associate-name '%s' can not appear in a variable"
4587 " definition context (%s) at %L because its target"
4588 " at %L can not, either",
4589 name, context, &e->where,
4590 &assoc->target->where);