tree
gfc_conv_string_init (tree length, gfc_expr * expr)
{
gfc_char_t *s;
HOST_WIDE_INT len;
int slen;
tree str;
bool free_s = false;
gcc_assert (expr->expr_type == EXPR_CONSTANT);
gcc_assert (expr->ts.type == BT_CHARACTER);
gcc_assert (INTEGER_CST_P (length));
gcc_assert (TREE_INT_CST_HIGH (length) == 0);
len = TREE_INT_CST_LOW (length);
slen = expr->value.character.length;
if (len > slen)
{
s = gfc_get_wide_string (len);
memcpy (s, expr->value.character.string, slen * sizeof (gfc_char_t));
gfc_wide_memset (&s[slen], ' ', len - slen);
free_s = true;
}
else
s = expr->value.character.string;
str = gfc_build_wide_string_const (expr->ts.kind, len, s);
if (free_s)
free (s);
return str;
}
static gfc_expr *
create_character_initializer (gfc_expr *init, gfc_typespec *ts,
gfc_ref *ref, gfc_expr *rvalue)
{
int len, start, end, tlen;
gfc_char_t *dest;
bool alloced_init = false;
gfc_extract_int (ts->u.cl->length, &len);
if (init == NULL)
{
/* Create a new initializer. */
init = gfc_get_character_expr (ts->kind, NULL, NULL, len);
init->ts = *ts;
alloced_init = true;
}
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). */
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))
|| !(gfc_simplify_expr(end_expr, 1)))
{
gfc_error ("failure to simplify substring reference in DATA "
"statement at %L", &ref->u.ss.start->where);
gfc_free_expr (start_expr);
gfc_free_expr (end_expr);
if (alloced_init)
gfc_free_expr (init);
return NULL;
}
gfc_extract_int (start_expr, &start);
gfc_free_expr (start_expr);
start--;
gfc_extract_int (end_expr, &end);
gfc_free_expr (end_expr);
}
else
{
/* Set the whole string. */
start = 0;
end = len;
}
/* Copy the initial value. */
if (rvalue->ts.type == BT_HOLLERITH)
len = rvalue->representation.length - rvalue->ts.u.pad;
else
len = rvalue->value.character.length;
tlen = end - start;
if (len > tlen)
{
if (tlen < 0)
{
gfc_warning_now (0, "Unused initialization string at %L because "
"variable has zero length", &rvalue->where);
len = 0;
}
else
{
gfc_warning_now (0, "Initialization string at %L was truncated to "
"fit the variable (%d/%d)", &rvalue->where,
tlen, len);
len = tlen;
}
}
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 < tlen && 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;
}
static gfc_expr *
create_character_intializer (gfc_expr *init, gfc_typespec *ts,
gfc_ref *ref, gfc_expr *rvalue)
{
int len, start, end;
gfc_char_t *dest;
gfc_extract_int (ts->cl->length, &len);
if (init == NULL)
{
/* 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
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). */
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 (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);
}
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;
}
