/* Common block and equivalence list handling
- Copyright (C) 2000, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2000, 2003, 2004, 2005, 2006
+ Free Software Foundation, Inc.
Contributed by Canqun Yang <canqun@nudt.edu.cn>
This file is part of GCC.
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. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
/* The core algorithm is based on Andy Vaught's g95 tree. Also the
way to build UNION_TYPE is borrowed from Richard Henderson.
#include "config.h"
#include "system.h"
#include "coretypes.h"
+#include "target.h"
#include "tree.h"
#include "toplev.h"
#include "tm.h"
+#include "rtl.h"
#include "gfortran.h"
#include "trans.h"
#include "trans-types.h"
#include "trans-const.h"
-/* Holds a single variable in a equivalence set. */
+/* Holds a single variable in an equivalence set. */
typedef struct segment_info
{
gfc_symbol *sym;
static segment_info * current_segment;
static gfc_namespace *gfc_common_ns = NULL;
-#define BLANK_COMMON_NAME "__BLNK__"
-
/* Make a segment_info based on a symbol. */
static segment_info *
DECL_FIELD_OFFSET (field),
DECL_SIZE_UNIT (field)));
/* If this field is assigned to a label, we create another two variables.
- One will hold the address of taget label or format label. The other will
+ One will hold the address of target label or format label. The other will
hold the length of format label string. */
if (h->sym->attr.assign)
{
/* Get storage for local equivalence. */
static tree
-build_equiv_decl (tree union_type, bool is_init)
+build_equiv_decl (tree union_type, bool is_init, bool is_saved)
{
tree decl;
char name[15];
{
decl = gfc_create_var (union_type, "equiv");
TREE_STATIC (decl) = 1;
+ GFC_DECL_COMMON_OR_EQUIV (decl) = 1;
return decl;
}
DECL_ARTIFICIAL (decl) = 1;
DECL_IGNORED_P (decl) = 1;
- if (!gfc_can_put_var_on_stack (DECL_SIZE_UNIT (decl)))
+ if (!gfc_can_put_var_on_stack (DECL_SIZE_UNIT (decl))
+ || is_saved)
TREE_STATIC (decl) = 1;
TREE_ADDRESSABLE (decl) = 1;
TREE_USED (decl) = 1;
+ GFC_DECL_COMMON_OR_EQUIV (decl) = 1;
/* The source location has been lost, and doesn't really matter.
We need to set it to something though. */
TREE_STATIC (decl) = 1;
DECL_ALIGN (decl) = BIGGEST_ALIGNMENT;
DECL_USER_ALIGN (decl) = 0;
+ GFC_DECL_COMMON_OR_EQUIV (decl) = 1;
gfc_set_decl_location (decl, &com->where);
+ if (com->threadprivate && targetm.have_tls)
+ DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
+
/* Place the back end declaration for this common block in
GLOBAL_BINDING_LEVEL. */
common_sym->backend_decl = pushdecl_top_level (decl);
record_layout_info rli;
tree decl;
bool is_init = false;
+ bool is_saved = false;
/* Declare the variables inside the common block.
If the current common block contains any equivalence object, then
/* Has initial value. */
if (s->sym->value)
is_init = true;
+
+ /* Has SAVE attribute. */
+ if (s->sym->attr.save)
+ is_saved = true;
}
finish_record_layout (rli, true);
if (com)
decl = build_common_decl (com, union_type, is_init);
else
- decl = build_equiv_decl (union_type, is_init);
+ decl = build_equiv_decl (union_type, is_init, is_saved);
if (is_init)
{
- tree list, ctor, tmp;
+ tree ctor, tmp;
HOST_WIDE_INT offset = 0;
+ VEC(constructor_elt,gc) *v = NULL;
- list = NULL_TREE;
for (s = head; s; s = s->next)
{
if (s->sym->value)
tmp = gfc_conv_initializer (s->sym->value, &s->sym->ts,
TREE_TYPE (s->field), s->sym->attr.dimension,
s->sym->attr.pointer || s->sym->attr.allocatable);
- list = tree_cons (s->field, tmp, list);
+
+ CONSTRUCTOR_APPEND_ELT (v, s->field, tmp);
offset = s->offset + s->length;
}
}
- gcc_assert (list);
- ctor = build1 (CONSTRUCTOR, union_type, nreverse(list));
+ gcc_assert (!VEC_empty (constructor_elt, v));
+ ctor = build_constructor (union_type, v);
TREE_CONSTANT (ctor) = 1;
TREE_INVARIANT (ctor) = 1;
TREE_STATIC (ctor) = 1;
DECL_INITIAL (decl) = ctor;
#ifdef ENABLE_CHECKING
- for (tmp = CONSTRUCTOR_ELTS (ctor); tmp; tmp = TREE_CHAIN (tmp))
- gcc_assert (TREE_CODE (TREE_PURPOSE (tmp)) == FIELD_DECL);
+ {
+ tree field, value;
+ unsigned HOST_WIDE_INT idx;
+ FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), idx, field, value)
+ gcc_assert (TREE_CODE (field) == FIELD_DECL);
+ }
#endif
}
/* Build component reference for each variable. */
for (s = head; s; s = next_s)
{
- s->sym->backend_decl = build3 (COMPONENT_REF, TREE_TYPE (s->field),
- decl, s->field, NULL_TREE);
+ tree var_decl;
+
+ var_decl = build_decl (VAR_DECL, DECL_NAME (s->field),
+ TREE_TYPE (s->field));
+ gfc_set_decl_location (var_decl, &s->sym->declared_at);
+ TREE_PUBLIC (var_decl) = TREE_PUBLIC (decl);
+ TREE_STATIC (var_decl) = TREE_STATIC (decl);
+ TREE_USED (var_decl) = TREE_USED (decl);
+ if (s->sym->attr.target)
+ TREE_ADDRESSABLE (var_decl) = 1;
+ /* This is a fake variable just for debugging purposes. */
+ TREE_ASM_WRITTEN (var_decl) = 1;
+
+ if (com)
+ var_decl = pushdecl_top_level (var_decl);
+ else
+ gfc_add_decl_to_function (var_decl);
+
+ SET_DECL_VALUE_EXPR (var_decl,
+ build3 (COMPONENT_REF, TREE_TYPE (s->field),
+ decl, s->field, NULL_TREE));
+ DECL_HAS_VALUE_EXPR_P (var_decl) = 1;
+ GFC_DECL_COMMON_OR_EQUIV (var_decl) = 1;
+
+ if (s->sym->attr.assign)
+ {
+ gfc_allocate_lang_decl (var_decl);
+ GFC_DECL_ASSIGN (var_decl) = 1;
+ GFC_DECL_STRING_LEN (var_decl) = GFC_DECL_STRING_LEN (s->field);
+ GFC_DECL_ASSIGN_ADDR (var_decl) = GFC_DECL_ASSIGN_ADDR (s->field);
+ }
+
+ s->sym->backend_decl = var_decl;
next_s = s->next;
gfc_free (s);
/* Given a segment element, search through the equivalence lists for unused
- conditions that involve the symbol. Add these rules to the segment. Only
- checks for rules involving the first symbol in the equivalence set. */
-
+ conditions that involve the symbol. Add these rules to the segment. */
+
static bool
find_equivalence (segment_info *n)
{
- gfc_equiv *e1, *e2, *eq, *other;
+ gfc_equiv *e1, *e2, *eq;
bool found;
-
+
found = FALSE;
+
for (e1 = n->sym->ns->equiv; e1; e1 = e1->next)
{
- other = NULL;
- for (e2 = e1->eq; e2; e2 = e2->eq)
- {
- if (e2->used)
- continue;
+ eq = NULL;
- if (e1->expr->symtree->n.sym == n->sym)
- {
- eq = e1;
- other = e2;
- }
- else if (e2->expr->symtree->n.sym == n->sym)
+ /* Search the equivalence list, including the root (first) element
+ for the symbol that owns the segment. */
+ for (e2 = e1; e2; e2 = e2->eq)
+ {
+ if (!e2->used && e2->expr->symtree->n.sym == n->sym)
{
eq = e2;
- other = e1;
+ break;
}
- else
- eq = NULL;
-
- if (eq)
+ }
+
+ /* Go to the next root element. */
+ if (eq == NULL)
+ continue;
+
+ eq->used = 1;
+
+ /* Now traverse the equivalence list matching the offsets. */
+ for (e2 = e1; e2; e2 = e2->eq)
+ {
+ if (!e2->used && e2 != eq)
{
- add_condition (n, eq, other);
- eq->used = 1;
+ add_condition (n, eq, e2);
+ e2->used = 1;
found = TRUE;
- /* If this symbol is the first in the chain we may find other
- matches. Otherwise we can skip to the next equivalence. */
- if (eq == e2)
- break;
}
}
}
}
-/* Add all symbols equivalenced within a segment. We need to scan the
- segment list multiple times to include indirect equivalences. */
+ /* Add all symbols equivalenced within a segment. We need to scan the
+ segment list multiple times to include indirect equivalences. Since
+ a new segment_info can inserted at the beginning of the segment list,
+ depending on its offset, we have to force a final pass through the
+ loop by demanding that completion sees a pass with no matches; ie.
+ all symbols with equiv_built set and no new equivalences found. */
static void
add_equivalences (bool *saw_equiv)
{
segment_info *f;
- bool more;
+ bool seen_one, more;
+ seen_one = false;
more = TRUE;
while (more)
{
if (!f->sym->equiv_built)
{
f->sym->equiv_built = 1;
- more = find_equivalence (f);
- if (more)
- *saw_equiv = true;
+ seen_one = find_equivalence (f);
+ if (seen_one)
+ {
+ *saw_equiv = true;
+ more = true;
+ }
}
}
}
/* Add symbols to the segment. */
for (sym = var_list; sym; sym = sym->common_next)
{
- if (sym->equiv_built)
- {
- /* Symbol has already been added via an equivalence. */
- current_segment = common_segment;
- s = find_segment_info (sym);
+ current_segment = common_segment;
+ s = find_segment_info (sym);
+ /* Symbol has already been added via an equivalence. Multiple
+ use associations of the same common block result in equiv_built
+ being set but no information about the symbol in the segment. */
+ if (s && sym->equiv_built)
+ {
/* Ensure the current location is properly aligned. */
align = TYPE_ALIGN_UNIT (s->field);
current_offset = (current_offset + align - 1) &~ (align - 1);
{
gfc_equiv *z, *y;
gfc_symbol *sym;
+ gfc_common_head * c;
HOST_WIDE_INT offset;
unsigned HOST_WIDE_INT align;
bool dummy;
apply_segment_offset (current_segment, offset);
- /* Create the decl. */
- create_common (NULL, current_segment, true);
+ /* Create the decl. If this is a module equivalence, it has a unique
+ name, pointed to by z->module. This is written to a gfc_common_header
+ to push create_common into using build_common_decl, so that the
+ equivalence appears as an external symbol. Otherwise, a local
+ declaration is built using build_equiv_decl.*/
+ if (z->module)
+ {
+ c = gfc_get_common_head ();
+ /* We've lost the real location, so use the location of the
+ enclosing procedure. */
+ c->where = ns->proc_name->declared_at;
+ strcpy (c->name, z->module);
+ }
+ else
+ c = NULL;
+
+ create_common (c, current_segment, true);
break;
}
}
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