/* Supporting functions for resolving DATA statement.
- Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ 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, 59 Temple Place - Suite 330,Boston, MA
-02111-1307, 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 handleing of array section, implied do
+
+ 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 "system.h"
-#include "coretypes.h"
-#include "toplev.h"
#include "gfortran.h"
-#include "assert.h"
-#include "trans.h"
+#include "data.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;
+ gfc_try re;
mpz_t delta;
mpz_t tmp;
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);
}
/* Find if there is a constructor which offset is equal to OFFSET. */
static gfc_constructor *
-find_con_by_offset (mpz_t offset, gfc_constructor *con)
+find_con_by_offset (splay_tree spt, mpz_t offset)
{
- for (; con; con = con->next)
+ mpz_t tmp;
+ gfc_constructor *ret = NULL;
+ gfc_constructor *con;
+ splay_tree_node sptn;
+
+ /* The complexity is due to needing quick access to the linked list of
+ constructors. Both a linked list and a splay tree are used, and both
+ are kept up to date if they are array elements (which is the only time
+ that a specific constructor has to be found). */
+
+ gcc_assert (spt != NULL);
+ mpz_init (tmp);
+
+ sptn = splay_tree_lookup (spt, (splay_tree_key) mpz_get_si (offset));
+
+ if (sptn)
+ ret = (gfc_constructor*) sptn->value;
+ else
{
- if (mpz_cmp (offset, con->n.offset) == 0)
- return con;
+ /* Need to check and see if we match a range, so we will pull
+ the next lowest index and see if the range matches. */
+ sptn = splay_tree_predecessor (spt,
+ (splay_tree_key) mpz_get_si (offset));
+ if (sptn)
+ {
+ con = (gfc_constructor*) sptn->value;
+ if (mpz_cmp_ui (con->repeat, 1) > 0)
+ {
+ mpz_init (tmp);
+ mpz_add (tmp, con->n.offset, con->repeat);
+ if (mpz_cmp (offset, tmp) < 0)
+ ret = con;
+ mpz_clear (tmp);
+ }
+ else
+ ret = NULL; /* The range did not match. */
+ }
+ else
+ ret = NULL; /* No pred, so no match. */
}
- return NULL;
+
+ return ret;
}
for (; con; con = con->next)
{
if (com == con->n.component)
- return con;
+ return con;
}
return NULL;
}
-/* Assign RVALUE to LVALUE where we assume that LVALUE is a substring
- reference. We do a little more than that: if LVALUE already has an
- initialization, we put RVALUE into the existing initialization as
- per the rules of assignment to a substring. If LVALUE has no
- initialization yet, we initialize it to all blanks, then filling in
- the RVALUE. */
-static void
-assign_substring_data_value (gfc_expr * lvalue, gfc_expr * rvalue)
+/* Create a character type initialization expression from RVALUE.
+ TS [and REF] describe [the substring of] the variable being initialized.
+ 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)
{
- gfc_symbol *symbol;
- gfc_expr *expr, *init;
- gfc_ref *ref;
- int len, i;
- int start, end;
- char *c, *d;
+ int len, start, end;
+ gfc_char_t *dest;
- symbol = lvalue->symtree->n.sym;
- ref = lvalue->ref;
- init = symbol->value;
+ gfc_extract_int (ts->u.cl->length, &len);
- assert (symbol->ts.type == BT_CHARACTER);
- assert (symbol->ts.cl->length->expr_type == EXPR_CONSTANT);
- assert (symbol->ts.cl->length->ts.type == BT_INTEGER);
- assert (symbol->ts.kind == 1);
-
- gfc_extract_int (symbol->ts.cl->length, &len);
-
if (init == NULL)
{
- /* Setup the expression to hold the constructor. */
- expr = gfc_get_expr ();
- expr->expr_type = EXPR_CONSTANT;
- expr->ts.type = BT_CHARACTER;
- expr->ts.kind = 1;
-
- expr->value.character.length = len;
- expr->value.character.string = gfc_getmem (len);
- memset (expr->value.character.string, ' ', len);
-
- symbol->value = expr;
+ /* Create a new initializer. */
+ init = gfc_get_expr ();
+ init->expr_type = EXPR_CONSTANT;
+ init->ts = *ts;
+
+ dest = gfc_get_wide_string (len + 1);
+ dest[len] = '\0';
+ init->value.character.length = len;
+ init->value.character.string = dest;
+ /* Blank the string if we're only setting a substring. */
+ if (ref != NULL)
+ gfc_wide_memset (dest, ' ', len);
}
else
- expr = init;
-
- /* Now that we have allocated the memory for the string,
- fill in the initialized places, truncating the
- intialization string if necessary, i.e.
- DATA a(1:2) /'123'/
- doesn't initialize a(3:3). */
-
- gfc_extract_int (ref->u.ss.start, &start);
- gfc_extract_int (ref->u.ss.end, &end);
-
- assert (start >= 1);
- assert (end <= len);
+ dest = init->value.character.string;
- len = rvalue->value.character.length;
- c = rvalue->value.character.string;
- d = &expr->value.character.string[start - 1];
+ if (ref)
+ {
+ gfc_expr *start_expr, *end_expr;
- for (i = 0; i <= end - start && i < len; i++)
- d[i] = c[i];
+ gcc_assert (ref->type == REF_SUBSTRING);
- /* Pad with spaces. I.e.
- DATA a(1:2) /'a'/
- intializes a(1:2) to 'a ' per the rules for assignment.
- If init == NULL we don't need to do this, as we have
- intialized the whole string to blanks above. */
+ /* Only set a substring of the destination. Fortran substring bounds
+ 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 (init != NULL)
- for (; i <= end - start; i++)
- d[i] = ' ';
+ 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 (end_expr, &end);
+ }
+ else
+ {
+ /* Set the whole string. */
+ start = 0;
+ end = len;
+ }
+
+ /* Copy the initial value. */
+ if (rvalue->ts.type == BT_HOLLERITH)
+ len = rvalue->representation.length;
+ else
+ len = rvalue->value.character.length;
+
+ if (len > end - start)
+ {
+ len = end - start;
+ gfc_warning_now ("initialization string truncated to match variable "
+ "at %L", &rvalue->where);
+ }
- return;
+ 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)
+ 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;
gfc_expr *expr;
gfc_constructor *con;
gfc_constructor *last_con;
+ gfc_constructor *pred;
gfc_symbol *symbol;
+ gfc_typespec *last_ts;
mpz_t offset;
-
- ref = lvalue->ref;
- if (ref != NULL && ref->type == REF_SUBSTRING)
- {
- /* No need to go through the for (; ref; ref->next) loop, since
- a single substring lvalue will only refer to a single
- substring, and therefore ref->next == NULL. */
- assert (ref->next == NULL);
- assign_substring_data_value (lvalue, rvalue);
- return;
- }
+ splay_tree spt;
+ splay_tree_node sptn;
symbol = lvalue->symtree->n.sym;
init = symbol->value;
+ last_ts = &symbol->ts;
last_con = NULL;
mpz_init_set_si (offset, 0);
- for (; ref; ref = ref->next)
+ /* Find/create the parent expressions for subobject references. */
+ for (ref = lvalue->ref; ref; ref = ref->next)
{
+ /* Break out of the loop if we find a substring. */
+ if (ref->type == REF_SUBSTRING)
+ {
+ /* 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 (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
+ typespec. */
+ expr->ts = *last_ts;
/* Setup the expression to hold the constructor. */
expr->expr_type = EXPR_ARRAY;
- if (ref->next)
+ expr->rank = ref->u.ar.as->rank;
+ }
+
+ if (ref->u.ar.type == AR_ELEMENT)
+ get_array_index (&ref->u.ar, &offset);
+ else
+ mpz_set (offset, index);
+
+ /* 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)
{
- assert (ref->next->type == REF_COMPONENT);
- expr->ts.type = BT_DERIVED;
+ 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);
+ }
+ }
+
+ /* Splay tree containing offset and gfc_constructor. */
+ spt = expr->con_by_offset;
+
+ if (spt == NULL)
+ {
+ spt = splay_tree_new (splay_tree_compare_ints, NULL, NULL);
+ expr->con_by_offset = spt;
+ con = NULL;
+ }
+ else
+ con = find_con_by_offset (spt, offset);
+
+ if (con == NULL)
+ {
+ splay_tree_key j;
+
+ /* Create a new constructor. */
+ con = gfc_get_constructor ();
+ mpz_set (con->n.offset, offset);
+ j = (splay_tree_key) mpz_get_si (offset);
+ sptn = splay_tree_insert (spt, j, (splay_tree_value) con);
+ /* Fix up the linked list. */
+ sptn = splay_tree_predecessor (spt, j);
+ if (sptn == NULL)
+ { /* Insert at the head. */
+ con->next = expr->value.constructor;
+ expr->value.constructor = con;
}
else
- expr->ts = rvalue->ts;
+ { /* Insert in the chain. */
+ pred = (gfc_constructor*) sptn->value;
+ con->next = pred->next;
+ pred->next = con;
+ }
+ }
+ 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.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);
+
+ 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;
+ }
+ break;
+
+ 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 (ref || last_ts->type == BT_CHARACTER)
+ {
+ 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 = (LOCATION_LINE (init->where.lb->location)
+ > LOCATION_LINE (rvalue->where.lb->location))
+ ? init : rvalue;
+ gfc_notify_std (GFC_STD_GNU, "Extension: re-initialization "
+ "of '%s' at %L", symbol->name, &expr->where);
+ }
+
+ expr = gfc_copy_expr (rvalue);
+ if (!gfc_compare_types (&lvalue->ts, &expr->ts))
+ gfc_convert_type (expr, &lvalue->ts, 0);
+ }
+
+ if (last_con == NULL)
+ 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. */
+
+void
+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_constructor *pred;
+ gfc_symbol *symbol;
+ gfc_typespec *last_ts;
+ mpz_t offset;
+ splay_tree spt;
+ splay_tree_node sptn;
+
+ 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
- assert (expr->expr_type == EXPR_ARRAY);
+ gcc_assert (expr->expr_type == EXPR_ARRAY);
if (ref->u.ar.type == AR_ELEMENT)
- get_array_index (&ref->u.ar, &offset);
+ {
+ 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);
+ {
+ 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);
+
+ /* Splay tree containing offset and gfc_constructor. */
+ spt = expr->con_by_offset;
+
+ if (spt == NULL)
+ {
+ spt = splay_tree_new (splay_tree_compare_ints, NULL, NULL);
+ expr->con_by_offset = spt;
+ con = NULL;
+ }
+ else
+ con = find_con_by_offset (spt, offset);
if (con == NULL)
{
+ splay_tree_key j;
/* Create a new constructor. */
- con = gfc_get_constructor();
+ con = gfc_get_constructor ();
mpz_set (con->n.offset, offset);
- gfc_insert_constructor (expr, con);
+ j = (splay_tree_key) mpz_get_si (offset);
+
+ if (ref->next == NULL)
+ mpz_set (con->repeat, repeat);
+ sptn = splay_tree_insert (spt, j, (splay_tree_value) con);
+ /* Fix up the linked list. */
+ sptn = splay_tree_predecessor (spt, j);
+ if (sptn == NULL)
+ { /* Insert at the head. */
+ con->next = expr->value.constructor;
+ expr->value.constructor = con;
+ }
+ else
+ { /* Insert in the chain. */
+ pred = (gfc_constructor*) sptn->value;
+ con->next = pred->next;
+ pred->next = con;
+ }
}
+ else
+ gcc_assert (ref->next != NULL);
break;
case REF_COMPONENT:
/* 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
- assert (expr->expr_type == EXPR_STRUCTURE);
+ 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->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: dealt with separately above. */
-
+ case REF_SUBSTRING:
default:
- abort ();
+ gcc_unreachable ();
}
if (init == NULL)
last_con = con;
}
- expr = gfc_copy_expr (rvalue);
- if (!gfc_compare_types (&lvalue->ts, &expr->ts))
- gfc_convert_type (expr, &lvalue->ts, 0);
+ 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);
+
+ expr = gfc_copy_expr (rvalue);
+ if (!gfc_compare_types (&lvalue->ts, &expr->ts))
+ gfc_convert_type (expr, &lvalue->ts, 0);
+ }
if (last_con == NULL)
symbol->value = expr;
else
- {
- assert (!last_con->expr);
- last_con->expr = expr;
- }
+ last_con->expr = expr;
}
-
/* 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);
}
/* Rearrange a structure constructor so the elements are in the specified
- order. Also insert NULL entries if neccessary. */
+ 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;
c = expr->value.constructor;
- /* Constructor is already fomalized. */
- if (c->n.component == NULL)
+ /* Constructor is already formalized. */
+ if (!c || c->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;
tail = tail->next;
}
}
- assert (c == NULL);
+ gcc_assert (c == NULL);
expr->value.constructor = head;
}
-/* 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;
break;
case DIMEN_VECTOR:
- gfc_todo_error ("Vectors sections in data statements");
+ gfc_internal_error ("TODO: Vector sections in data statements");
default:
- abort ();
+ gcc_unreachable ();
}
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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