}
}
+/* Add cgraph NODE to queue starting at FIRST. */
+
+static void
+enqueue_cgraph_node (struct cgraph_node *node, struct cgraph_node **first)
+{
+ node->aux = *first;
+ *first = node;
+}
+
+/* Add varpool NODE to queue starting at FIRST. */
+
+static void
+enqueue_varpool_node (struct varpool_node *node, struct varpool_node **first)
+{
+ node->aux = *first;
+ *first = node;
+}
+
+/* Process references. */
+
+static void
+process_references (struct ipa_ref_list *list,
+ struct cgraph_node **first,
+ struct varpool_node **first_varpool,
+ bool before_inlining_p)
+{
+ int i;
+ struct ipa_ref *ref;
+ for (i = 0; ipa_ref_list_reference_iterate (list, i, ref); i++)
+ {
+ if (ref->refered_type == IPA_REF_CGRAPH)
+ {
+ struct cgraph_node *node = ipa_ref_node (ref);
+ if (!node->reachable
+ && (!DECL_EXTERNAL (node->decl)
+ || before_inlining_p))
+ {
+ node->reachable = true;
+ enqueue_cgraph_node (node, first);
+ }
+ }
+ else
+ {
+ struct varpool_node *node = ipa_ref_varpool_node (ref);
+ if (!node->needed)
+ {
+ varpool_mark_needed_node (node);
+ enqueue_varpool_node (node, first_varpool);
+ }
+ }
+ }
+}
+
+/* Return true when function NODE can be removed from callgraph
+ if all direct calls are eliminated. */
+
+static inline bool
+varpool_can_remove_if_no_refs (struct varpool_node *node)
+{
+ return (!node->force_output && !node->used_from_other_partition
+ && (DECL_COMDAT (node->decl) || !node->externally_visible));
+}
+
/* Perform reachability analysis and reclaim all unreachable nodes.
If BEFORE_INLINING_P is true this function is called before inlining
decisions has been made. If BEFORE_INLINING_P is false this function also
cgraph_remove_unreachable_nodes (bool before_inlining_p, FILE *file)
{
struct cgraph_node *first = (struct cgraph_node *) (void *) 1;
+ struct varpool_node *first_varpool = (struct varpool_node *) (void *) 1;
struct cgraph_node *processed = (struct cgraph_node *) (void *) 2;
struct cgraph_node *node, *next;
+ struct varpool_node *vnode, *vnext;
bool changed = false;
#ifdef ENABLE_CHECKING
for (node = cgraph_nodes; node; node = node->next)
gcc_assert (!node->aux);
#endif
+ varpool_reset_queue ();
for (node = cgraph_nodes; node; node = node->next)
if (!cgraph_can_remove_if_no_direct_calls_p (node)
&& ((!DECL_EXTERNAL (node->decl))
- || !node->analyzed
|| before_inlining_p))
{
gcc_assert (!node->global.inlined_to);
- node->aux = first;
- first = node;
+ enqueue_cgraph_node (node, &first);
node->reachable = true;
}
else
gcc_assert (!node->aux);
node->reachable = false;
}
+ for (vnode = varpool_nodes; vnode; vnode = vnode->next)
+ {
+ vnode->next_needed = NULL;
+ vnode->prev_needed = NULL;
+ if (!varpool_can_remove_if_no_refs (vnode))
+ {
+ vnode->needed = false;
+ varpool_mark_needed_node (vnode);
+ enqueue_varpool_node (vnode, &first_varpool);
+ }
+ else
+ vnode->needed = false;
+ }
/* Perform reachability analysis. As a special case do not consider
extern inline functions not inlined as live because we won't output
them at all. */
- while (first != (void *) 1)
+ while (first != (struct cgraph_node *) (void *) 1
+ || first_varpool != (struct varpool_node *) (void *) 1)
{
- struct cgraph_edge *e;
- node = first;
- first = (struct cgraph_node *) first->aux;
- node->aux = processed;
-
- if (node->reachable)
- for (e = node->callees; e; e = e->next_callee)
- if (!e->callee->reachable
- && node->analyzed
- && (!e->inline_failed || !e->callee->analyzed
- || (!DECL_EXTERNAL (e->callee->decl))
- || before_inlining_p))
+ if (first != (struct cgraph_node *) (void *) 1)
+ {
+ struct cgraph_edge *e;
+ node = first;
+ first = (struct cgraph_node *) first->aux;
+ node->aux = processed;
+
+ if (node->reachable)
+ for (e = node->callees; e; e = e->next_callee)
+ if (!e->callee->reachable
+ && node->analyzed
+ && (!e->inline_failed || !e->callee->analyzed
+ || (!DECL_EXTERNAL (e->callee->decl))
+ || before_inlining_p))
+ {
+ bool prev_reachable = e->callee->reachable;
+ e->callee->reachable |= node->reachable;
+ if (!e->callee->aux
+ || (e->callee->aux == processed
+ && prev_reachable != e->callee->reachable))
+ {
+ e->callee->aux = first;
+ first = e->callee;
+ }
+ }
+
+ /* If any function in a comdat group is reachable, force
+ all other functions in the same comdat group to be
+ also reachable. */
+ if (node->same_comdat_group
+ && node->reachable
+ && !node->global.inlined_to)
{
- bool prev_reachable = e->callee->reachable;
- e->callee->reachable |= node->reachable;
- if (!e->callee->aux
- || (e->callee->aux == processed
- && prev_reachable != e->callee->reachable))
- {
- e->callee->aux = first;
- first = e->callee;
- }
+ for (next = node->same_comdat_group;
+ next != node;
+ next = next->same_comdat_group)
+ if (!next->reachable)
+ {
+ next->aux = first;
+ first = next;
+ next->reachable = true;
+ }
}
- /* If any function in a comdat group is reachable, force
- all other functions in the same comdat group to be
- also reachable. */
- if (node->same_comdat_group
- && node->reachable
- && !node->global.inlined_to)
- {
- for (next = node->same_comdat_group;
- next != node;
- next = next->same_comdat_group)
- if (!next->reachable)
- {
- next->aux = first;
- first = next;
- next->reachable = true;
- }
- }
-
- /* We can freely remove inline clones even if they are cloned, however if
- function is clone of real clone, we must keep it around in order to
- make materialize_clones produce function body with the changes
- applied. */
- while (node->clone_of && !node->clone_of->aux && !gimple_has_body_p (node->decl))
- {
- bool noninline = node->clone_of->decl != node->decl;
- node = node->clone_of;
- if (noninline)
+ /* We can freely remove inline clones even if they are cloned, however if
+ function is clone of real clone, we must keep it around in order to
+ make materialize_clones produce function body with the changes
+ applied. */
+ while (node->clone_of && !node->clone_of->aux && !gimple_has_body_p (node->decl))
{
- node->aux = first;
- first = node;
- break;
+ bool noninline = node->clone_of->decl != node->decl;
+ node = node->clone_of;
+ if (noninline)
+ {
+ enqueue_cgraph_node (node, &first);
+ break;
+ }
}
+ process_references (&node->ref_list, &first, &first_varpool, before_inlining_p);
+ }
+ if (first_varpool != (struct varpool_node *) (void *) 1)
+ {
+ vnode = first_varpool;
+ first_varpool = (struct varpool_node *)first_varpool->aux;
+ vnode->aux = NULL;
+ process_references (&vnode->ref_list, &first, &first_varpool, before_inlining_p);
}
}
else
gcc_assert (!clone->in_other_partition);
cgraph_node_remove_callees (node);
+ ipa_remove_all_references (&node->ref_list);
if (node->prev_sibling_clone)
node->prev_sibling_clone->next_sibling_clone = node->next_sibling_clone;
else if (node->clone_of)
}
node->aux = NULL;
}
+ if (file)
+ fprintf (file, "\nReclaiming variables:");
+ for (vnode = varpool_nodes; vnode; vnode = vnext)
+ {
+ vnext = vnode->next;
+ if (!vnode->needed)
+ {
+ if (file)
+ fprintf (file, " %s", varpool_node_name (vnode));
+ varpool_remove_node (vnode);
+ }
+ }
+
#ifdef ENABLE_CHECKING
verify_cgraph ();
#endif
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