/* Supporting functions for resolving DATA statement.
- Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+ Free Software Foundation, Inc.
Contributed by Lifang Zeng <zlf605@hotmail.com>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor,Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* Notes for DATA statement implementation:
-
+
We first assign initial value to each symbol by gfc_assign_data_value
- during resolveing DATA statement. Refer to check_data_variable and
+ during resolving DATA statement. Refer to check_data_variable and
traverse_data_list in resolve.c.
-
+
The complexity exists in the handling of array section, implied do
and array of struct appeared in DATA statement.
-
+
We call gfc_conv_structure, gfc_con_array_array_initializer,
etc., to convert the initial value. Refer to trans-expr.c and
trans-array.c. */
#include "config.h"
#include "gfortran.h"
+#include "data.h"
+#include "constructor.h"
static void formalize_init_expr (gfc_expr *);
/* Calculate the array element offset. */
static void
-get_array_index (gfc_array_ref * ar, mpz_t * offset)
+get_array_index (gfc_array_ref *ar, mpz_t *offset)
{
gfc_expr *e;
int i;
- try re;
mpz_t delta;
mpz_t tmp;
for (i = 0; i < ar->dimen; i++)
{
e = gfc_copy_expr (ar->start[i]);
- re = gfc_simplify_expr (e, 1);
+ gfc_simplify_expr (e, 1);
if ((gfc_is_constant_expr (ar->as->lower[i]) == 0)
|| (gfc_is_constant_expr (ar->as->upper[i]) == 0)
|| (gfc_is_constant_expr (e) == 0))
- gfc_error ("non-constant array in DATA statement %L.", &ar->where);
+ gfc_error ("non-constant array in DATA statement %L", &ar->where);
+
mpz_set (tmp, e->value.integer);
mpz_sub (tmp, tmp, ar->as->lower[i]->value.integer);
mpz_mul (tmp, tmp, delta);
mpz_add (*offset, tmp, *offset);
mpz_sub (tmp, ar->as->upper[i]->value.integer,
- ar->as->lower[i]->value.integer);
+ ar->as->lower[i]->value.integer);
mpz_add_ui (tmp, tmp, 1);
mpz_mul (delta, tmp, delta);
}
mpz_clear (tmp);
}
-
-/* Find if there is a constructor which offset is equal to OFFSET. */
+/* Find if there is a constructor which component is equal to COM.
+ TODO: remove this, use symbol.c(gfc_find_component) instead. */
static gfc_constructor *
-find_con_by_offset (mpz_t offset, gfc_constructor *con)
+find_con_by_component (gfc_component *com, gfc_constructor_base base)
{
- mpz_t tmp;
- gfc_constructor *ret = NULL;
-
- mpz_init (tmp);
-
- for (; con; con = con->next)
- {
- int cmp = mpz_cmp (offset, con->n.offset);
-
- /* We retain a sorted list, so if we're too large, we're done. */
- if (cmp < 0)
- break;
-
- /* Yaye for exact matches. */
- if (cmp == 0)
- {
- ret = con;
- break;
- }
-
- /* If the constructor element is a range, match any element. */
- if (mpz_cmp_ui (con->repeat, 1) > 0)
- {
- mpz_add (tmp, con->n.offset, con->repeat);
- if (mpz_cmp (offset, tmp) < 0)
- {
- ret = con;
- break;
- }
- }
- }
-
- mpz_clear (tmp);
- return ret;
-}
-
+ gfc_constructor *c;
-/* Find if there is a constructor which component is equal to COM. */
+ for (c = gfc_constructor_first (base); c; c = gfc_constructor_next (c))
+ if (com == c->n.component)
+ return c;
-static gfc_constructor *
-find_con_by_component (gfc_component *com, gfc_constructor *con)
-{
- for (; con; con = con->next)
- {
- if (com == con->n.component)
- return con;
- }
return NULL;
}
/* Create a character type initialization expression from RVALUE.
TS [and REF] describe [the substring of] the variable being initialized.
- INIT is thh existing initializer, not NULL. Initialization is performed
+ INIT is the existing initializer, not NULL. Initialization is performed
according to normal assignment rules. */
static gfc_expr *
-create_character_intializer (gfc_expr * init, gfc_typespec * ts,
- gfc_ref * ref, gfc_expr * rvalue)
+create_character_intializer (gfc_expr *init, gfc_typespec *ts,
+ gfc_ref *ref, gfc_expr *rvalue)
{
- int len;
- int start;
- int end;
- char *dest;
+ int len, start, end;
+ gfc_char_t *dest;
- gfc_extract_int (ts->cl->length, &len);
+ gfc_extract_int (ts->u.cl->length, &len);
if (init == NULL)
{
/* Create a new initializer. */
- init = gfc_get_expr ();
- init->expr_type = EXPR_CONSTANT;
+ init = gfc_get_character_expr (ts->kind, NULL, NULL, len);
init->ts = *ts;
-
- dest = gfc_getmem (len);
- init->value.character.length = len;
- init->value.character.string = dest;
- /* Blank the string if we're only setting a substring. */
- if (ref != NULL)
- memset (dest, ' ', len);
}
- else
- dest = init->value.character.string;
+
+ dest = init->value.character.string;
if (ref)
{
+ gfc_expr *start_expr, *end_expr;
+
gcc_assert (ref->type == REF_SUBSTRING);
/* Only set a substring of the destination. Fortran substring bounds
- are one-based [start, end], we want zero based [start, end). */
- gfc_extract_int (ref->u.ss.start, &start);
+ are one-based [start, end], we want zero based [start, end). */
+ start_expr = gfc_copy_expr (ref->u.ss.start);
+ end_expr = gfc_copy_expr (ref->u.ss.end);
+
+ if ((gfc_simplify_expr (start_expr, 1) == FAILURE)
+ || (gfc_simplify_expr (end_expr, 1)) == FAILURE)
+ {
+ gfc_error ("failure to simplify substring reference in DATA "
+ "statement at %L", &ref->u.ss.start->where);
+ return NULL;
+ }
+
+ gfc_extract_int (start_expr, &start);
start--;
- gfc_extract_int (ref->u.ss.end, &end);
+ gfc_extract_int (end_expr, &end);
}
else
{
}
/* Copy the initial value. */
- len = rvalue->value.character.length;
+ if (rvalue->ts.type == BT_HOLLERITH)
+ len = rvalue->representation.length;
+ else
+ len = rvalue->value.character.length;
+
if (len > end - start)
- len = end - start;
- memcpy (&dest[start], rvalue->value.character.string, len);
+ {
+ len = end - start;
+ gfc_warning_now ("initialization string truncated to match variable "
+ "at %L", &rvalue->where);
+ }
+
+ if (rvalue->ts.type == BT_HOLLERITH)
+ {
+ int i;
+ for (i = 0; i < len; i++)
+ dest[start+i] = rvalue->representation.string[i];
+ }
+ else
+ memcpy (&dest[start], rvalue->value.character.string,
+ len * sizeof (gfc_char_t));
/* Pad with spaces. Substrings will already be blanked. */
if (len < end - start && ref == NULL)
- memset (&dest[start + len], ' ', end - (start + len));
+ gfc_wide_memset (&dest[start + len], ' ', end - (start + len));
+
+ if (rvalue->ts.type == BT_HOLLERITH)
+ {
+ init->representation.length = init->value.character.length;
+ init->representation.string
+ = gfc_widechar_to_char (init->value.character.string,
+ init->value.character.length);
+ }
return init;
}
+
/* Assign the initial value RVALUE to LVALUE's symbol->value. If the
LVALUE already has an initialization, we extend this, otherwise we
create a new one. */
-void
-gfc_assign_data_value (gfc_expr * lvalue, gfc_expr * rvalue, mpz_t index)
+gfc_try
+gfc_assign_data_value (gfc_expr *lvalue, gfc_expr *rvalue, mpz_t index)
{
gfc_ref *ref;
gfc_expr *init;
/* Break out of the loop if we find a substring. */
if (ref->type == REF_SUBSTRING)
{
- /* A substring should always br the last subobject reference. */
+ /* A substring should always be the last subobject reference. */
gcc_assert (ref->next == NULL);
break;
}
/* Use the existing initializer expression if it exists. Otherwise
- create a new one. */
+ create a new one. */
if (init == NULL)
expr = gfc_get_expr ();
else
switch (ref->type)
{
case REF_ARRAY:
+ if (ref->u.ar.as->rank == 0)
+ {
+ gcc_assert (ref->u.ar.as->corank > 0);
+ if (init == NULL)
+ gfc_free (expr);
+ continue;
+ }
+
+ if (init && expr->expr_type != EXPR_ARRAY)
+ {
+ gfc_error ("'%s' at %L already is initialized at %L",
+ lvalue->symtree->n.sym->name, &lvalue->where,
+ &init->where);
+ return FAILURE;
+ }
+
if (init == NULL)
{
/* The element typespec will be the same as the array
expr->expr_type = EXPR_ARRAY;
expr->rank = ref->u.ar.as->rank;
}
- else
- gcc_assert (expr->expr_type == EXPR_ARRAY);
if (ref->u.ar.type == AR_ELEMENT)
get_array_index (&ref->u.ar, &offset);
else
mpz_set (offset, index);
- /* Find the same element in the existing constructor. */
- con = expr->value.constructor;
- con = find_con_by_offset (offset, con);
+ /* Check the bounds. */
+ if (mpz_cmp_si (offset, 0) < 0)
+ {
+ gfc_error ("Data element below array lower bound at %L",
+ &lvalue->where);
+ return FAILURE;
+ }
+ else
+ {
+ mpz_t size;
+ if (spec_size (ref->u.ar.as, &size) == SUCCESS)
+ {
+ if (mpz_cmp (offset, size) >= 0)
+ {
+ mpz_clear (size);
+ gfc_error ("Data element above array upper bound at %L",
+ &lvalue->where);
+ return FAILURE;
+ }
+ mpz_clear (size);
+ }
+ }
- if (con == NULL)
+ con = gfc_constructor_lookup (expr->value.constructor,
+ mpz_get_si (offset));
+ if (!con)
{
- /* Create a new constructor. */
- con = gfc_get_constructor ();
- mpz_set (con->n.offset, offset);
- gfc_insert_constructor (expr, con);
+ con = gfc_constructor_insert_expr (&expr->value.constructor,
+ NULL, &rvalue->where,
+ mpz_get_si (offset));
}
break;
/* Setup the expression to hold the constructor. */
expr->expr_type = EXPR_STRUCTURE;
expr->ts.type = BT_DERIVED;
- expr->ts.derived = ref->u.c.sym;
+ expr->ts.u.derived = ref->u.c.sym;
}
else
gcc_assert (expr->expr_type == EXPR_STRUCTURE);
last_ts = &ref->u.c.component->ts;
/* Find the same element in the existing constructor. */
- con = expr->value.constructor;
- con = find_con_by_component (ref->u.c.component, con);
+ con = find_con_by_component (ref->u.c.component,
+ expr->value.constructor);
if (con == NULL)
{
/* Create a new constructor. */
- con = gfc_get_constructor ();
+ con = gfc_constructor_append_expr (&expr->value.constructor,
+ NULL, NULL);
con->n.component = ref->u.c.component;
- con->next = expr->value.constructor;
- expr->value.constructor = con;
}
break;
}
if (ref || last_ts->type == BT_CHARACTER)
- expr = create_character_intializer (init, last_ts, ref, rvalue);
+ {
+ if (lvalue->ts.u.cl->length == NULL && !(ref && ref->u.ss.length != NULL))
+ return FAILURE;
+ expr = create_character_intializer (init, last_ts, ref, rvalue);
+ }
else
{
/* Overwriting an existing initializer is non-standard but usually only
provokes a warning from other compilers. */
if (init != NULL)
{
- /* Order in which the expressions arrive here depends on whether they
- are from data statements or F95 style declarations. Therefore,
- check which is the most recent. */
- expr = (init->where.lb->linenum > rvalue->where.lb->linenum) ?
- init : rvalue;
- gfc_notify_std (GFC_STD_GNU, "Extension: re-initialization "
- "of '%s' at %L", symbol->name, &expr->where);
- return;
+ /* Order in which the expressions arrive here depends on whether
+ they are from data statements or F95 style declarations.
+ Therefore, check which is the most recent. */
+ expr = (LOCATION_LINE (init->where.lb->location)
+ > LOCATION_LINE (rvalue->where.lb->location))
+ ? init : rvalue;
+ if (gfc_notify_std (GFC_STD_GNU,"Extension: "
+ "re-initialization of '%s' at %L",
+ symbol->name, &expr->where) == FAILURE)
+ return FAILURE;
}
expr = gfc_copy_expr (rvalue);
symbol->value = expr;
else
last_con->expr = expr;
+
+ return SUCCESS;
}
+
/* Similarly, but initialize REPEAT consecutive values in LVALUE the same
- value in RVALUE. For the nonce, LVALUE must refer to a full array, not
- an array section. */
+ value in RVALUE. */
-void
-gfc_assign_data_value_range (gfc_expr * lvalue, gfc_expr * rvalue,
+gfc_try
+gfc_assign_data_value_range (gfc_expr *lvalue, gfc_expr *rvalue,
mpz_t index, mpz_t repeat)
{
- gfc_ref *ref;
- gfc_expr *init, *expr;
- gfc_constructor *con, *last_con;
- gfc_symbol *symbol;
- gfc_typespec *last_ts;
- mpz_t offset;
-
- symbol = lvalue->symtree->n.sym;
- init = symbol->value;
- last_ts = &symbol->ts;
- last_con = NULL;
- mpz_init_set_si (offset, 0);
-
- /* Find/create the parent expressions for subobject references. */
- for (ref = lvalue->ref; ref; ref = ref->next)
- {
- /* Use the existing initializer expression if it exists.
- Otherwise create a new one. */
- if (init == NULL)
- expr = gfc_get_expr ();
- else
- expr = init;
-
- /* Find or create this element. */
- switch (ref->type)
- {
- case REF_ARRAY:
- if (init == NULL)
- {
- /* The element typespec will be the same as the array
- typespec. */
- expr->ts = *last_ts;
- /* Setup the expression to hold the constructor. */
- expr->expr_type = EXPR_ARRAY;
- expr->rank = ref->u.ar.as->rank;
- }
- else
- gcc_assert (expr->expr_type == EXPR_ARRAY);
-
- if (ref->u.ar.type == AR_ELEMENT)
- {
- get_array_index (&ref->u.ar, &offset);
-
- /* This had better not be the bottom of the reference.
- We can still get to a full array via a component. */
- gcc_assert (ref->next != NULL);
- }
- else
- {
- mpz_set (offset, index);
-
- /* We're at a full array or an array section. This means
- that we've better have found a full array, and that we're
- at the bottom of the reference. */
- gcc_assert (ref->u.ar.type == AR_FULL);
- gcc_assert (ref->next == NULL);
- }
-
- /* Find the same element in the existing constructor. */
- con = expr->value.constructor;
- con = find_con_by_offset (offset, con);
-
- /* Create a new constructor. */
- if (con == NULL)
- {
- con = gfc_get_constructor ();
- mpz_set (con->n.offset, offset);
- if (ref->next == NULL)
- mpz_set (con->repeat, repeat);
- gfc_insert_constructor (expr, con);
- }
- else
- gcc_assert (ref->next != NULL);
- break;
-
- case REF_COMPONENT:
- if (init == NULL)
- {
- /* Setup the expression to hold the constructor. */
- expr->expr_type = EXPR_STRUCTURE;
- expr->ts.type = BT_DERIVED;
- expr->ts.derived = ref->u.c.sym;
- }
- else
- gcc_assert (expr->expr_type == EXPR_STRUCTURE);
- last_ts = &ref->u.c.component->ts;
-
- /* Find the same element in the existing constructor. */
- con = expr->value.constructor;
- con = find_con_by_component (ref->u.c.component, con);
-
- if (con == NULL)
- {
- /* Create a new constructor. */
- con = gfc_get_constructor ();
- con->n.component = ref->u.c.component;
- con->next = expr->value.constructor;
- expr->value.constructor = con;
- }
-
- /* Since we're only intending to initialize arrays here,
- there better be an inner reference. */
- gcc_assert (ref->next != NULL);
- break;
-
- case REF_SUBSTRING:
- default:
- gcc_unreachable ();
- }
-
- if (init == NULL)
- {
- /* Point the container at the new expression. */
- if (last_con == NULL)
- symbol->value = expr;
- else
- last_con->expr = expr;
- }
- init = con->expr;
- last_con = con;
- }
-
- if (last_ts->type == BT_CHARACTER)
- expr = create_character_intializer (init, last_ts, NULL, rvalue);
- else
- {
- /* We should never be overwriting an existing initializer. */
- gcc_assert (!init);
+ mpz_t offset, last_offset;
+ gfc_try t;
+
+ mpz_init (offset);
+ mpz_init (last_offset);
+ mpz_add (last_offset, index, repeat);
+
+ t = SUCCESS;
+ for (mpz_set(offset, index) ; mpz_cmp(offset, last_offset) < 0;
+ mpz_add_ui (offset, offset, 1))
+ if (gfc_assign_data_value (lvalue, rvalue, offset) == FAILURE)
+ {
+ t = FAILURE;
+ break;
+ }
- expr = gfc_copy_expr (rvalue);
- if (!gfc_compare_types (&lvalue->ts, &expr->ts))
- gfc_convert_type (expr, &lvalue->ts, 0);
- }
+ mpz_clear (offset);
+ mpz_clear (last_offset);
- if (last_con == NULL)
- symbol->value = expr;
- else
- last_con->expr = expr;
+ return t;
}
+
/* Modify the index of array section and re-calculate the array offset. */
void
else
cmp = mpz_cmp (section_index[i], ar->as->upper[i]->value.integer);
- if ((cmp > 0 && forwards)
- || (cmp < 0 && ! forwards))
+ if ((cmp > 0 && forwards) || (cmp < 0 && !forwards))
{
- /* Reset index to start, then loop to advance the next index. */
+ /* Reset index to start, then loop to advance the next index. */
if (ar->start[i])
mpz_set (section_index[i], ar->start[i]->value.integer);
else
mpz_add (*offset_ret, tmp, *offset_ret);
mpz_sub (tmp, ar->as->upper[i]->value.integer,
- ar->as->lower[i]->value.integer);
+ ar->as->lower[i]->value.integer);
mpz_add_ui (tmp, tmp, 1);
mpz_mul (delta, tmp, delta);
}
order. Also insert NULL entries if necessary. */
static void
-formalize_structure_cons (gfc_expr * expr)
+formalize_structure_cons (gfc_expr *expr)
{
- gfc_constructor *head;
- gfc_constructor *tail;
+ gfc_constructor_base base = NULL;
gfc_constructor *cur;
- gfc_constructor *last;
- gfc_constructor *c;
gfc_component *order;
- c = expr->value.constructor;
-
/* Constructor is already formalized. */
- if (c->n.component == NULL)
+ cur = gfc_constructor_first (expr->value.constructor);
+ if (!cur || cur->n.component == NULL)
return;
- head = tail = NULL;
- for (order = expr->ts.derived->components; order; order = order->next)
+ for (order = expr->ts.u.derived->components; order; order = order->next)
{
- /* Find the next component. */
- last = NULL;
- cur = c;
- while (cur != NULL && cur->n.component != order)
- {
- last = cur;
- cur = cur->next;
- }
-
- if (cur == NULL)
- {
- /* Create a new one. */
- cur = gfc_get_constructor ();
- }
+ cur = find_con_by_component (order, expr->value.constructor);
+ if (cur)
+ gfc_constructor_append_expr (&base, cur->expr, &cur->expr->where);
else
- {
- /* Remove it from the chain. */
- if (last == NULL)
- c = cur->next;
- else
- last->next = cur->next;
- cur->next = NULL;
+ gfc_constructor_append_expr (&base, NULL, NULL);
+ }
- formalize_init_expr (cur->expr);
- }
+ /* For all what it's worth, one would expect
+ gfc_constructor_free (expr->value.constructor);
+ here. However, if the constructor is actually free'd,
+ hell breaks loose in the testsuite?! */
- /* Add it to the new constructor. */
- if (head == NULL)
- head = tail = cur;
- else
- {
- tail->next = cur;
- tail = tail->next;
- }
- }
- gcc_assert (c == NULL);
- expr->value.constructor = head;
+ expr->value.constructor = base;
}
-/* Make sure an initialization expression is in normalized form. Ie. all
+/* Make sure an initialization expression is in normalized form, i.e., all
elements of the constructors are in the correct order. */
static void
-formalize_init_expr (gfc_expr * expr)
+formalize_init_expr (gfc_expr *expr)
{
expr_t type;
gfc_constructor *c;
switch (type)
{
case EXPR_ARRAY:
- c = expr->value.constructor;
- while (c)
- {
- formalize_init_expr (c->expr);
- c = c->next;
- }
- break;
+ for (c = gfc_constructor_first (expr->value.constructor);
+ c; c = gfc_constructor_next (c))
+ formalize_init_expr (c->expr);
+
+ break;
case EXPR_STRUCTURE:
formalize_structure_cons (expr);
}
mpz_sub (tmp, ar->as->upper[i]->value.integer,
- ar->as->lower[i]->value.integer);
+ ar->as->lower[i]->value.integer);
mpz_add_ui (tmp, tmp, 1);
mpz_mul (delta, tmp, delta);
}
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