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. */
/* This module implements main driver of compilation process as well as
few basic intraprocedural optimizers.
#include "c-common.h"
#include "intl.h"
#include "function.h"
+#include "ipa-prop.h"
#include "tree-gimple.h"
#include "tree-pass.h"
#include "output.h"
static void cgraph_mark_functions_to_output (void);
static void cgraph_expand_function (struct cgraph_node *);
static tree record_reference (tree *, int *, void *);
-static void cgraph_analyze_function (struct cgraph_node *node);
+static void cgraph_output_pending_asms (void);
/* Records tree nodes seen in record_reference. Simply using
walk_tree_without_duplicates doesn't guarantee each node is visited
decide_is_function_needed (struct cgraph_node *node, tree decl)
{
tree origin;
+ if (MAIN_NAME_P (DECL_NAME (decl))
+ && TREE_PUBLIC (decl))
+ {
+ node->local.externally_visible = true;
+ return true;
+ }
/* If the user told us it is used, then it must be so. */
- if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
+ if (node->local.externally_visible
+ || lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
return true;
/* ??? If the assembler name is set by hand, it is possible to assemble
/* Externally visible functions must be output. The exception is
COMDAT functions that must be output only when they are needed. */
- if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl))
+ if ((TREE_PUBLIC (decl) && !flag_whole_program)
+ && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl))
return true;
/* Constructors and destructors are reachable from the runtime by
/* When declared inline, defer even the uninlinable functions.
This allows them to be eliminated when unused. */
&& !DECL_DECLARED_INLINE_P (decl)
- && (!node->local.inlinable || !cgraph_default_inline_p (node))))
+ && (!node->local.inlinable || !cgraph_default_inline_p (node, NULL))))
return true;
return false;
&& ((DECL_ASSEMBLER_NAME_SET_P (decl)
&& TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
|| node->force_output
- || decide_is_variable_needed (node, decl)))
+ || decide_is_variable_needed (node, decl)
+ /* ??? Cgraph does not yet rule the world with an iron hand,
+ and does not control the emission of debug information.
+ After a variable has its DECL_RTL set, we must assume that
+ it may be referenced by the debug information, and we can
+ no longer elide it. */
+ || DECL_RTL_SET_P (decl)))
cgraph_varpool_mark_needed_node (node);
node = next;
}
+ /* Make sure we mark alias targets as used targets. */
+ finish_aliases_1 ();
cgraph_varpool_analyze_pending_decls ();
}
if (flag_unit_at_a_time)
return false;
+ cgraph_output_pending_asms ();
+
while (cgraph_nodes_queue)
{
struct cgraph_node *n = cgraph_nodes_queue;
}
}
+ /* Process CGRAPH_EXPAND_QUEUE, these are functions created during
+ the expansion process. Note that this queue may grow as its
+ being processed, as the new functions may generate new ones. */
+ while (cgraph_expand_queue)
+ {
+ struct cgraph_node *n = cgraph_expand_queue;
+ cgraph_expand_queue = cgraph_expand_queue->next_needed;
+ n->next_needed = NULL;
+ cgraph_finalize_function (n->decl, false);
+ output = true;
+ }
+
return output;
}
+
+
/* As an GCC extension we allow redefinition of the function. The
semantics when both copies of bodies differ is not well defined.
We replace the old body with new body so in unit at a time mode
}
}
+static void
+cgraph_lower_function (struct cgraph_node *node)
+{
+ if (node->lowered)
+ return;
+ tree_lowering_passes (node->decl);
+ node->lowered = true;
+}
+
/* DECL has been parsed. Take it, queue it, compile it at the whim of the
logic in effect. If NESTED is true, then our caller cannot stand to have
the garbage collector run at the moment. We would need to either create
if (!flag_unit_at_a_time)
{
cgraph_analyze_function (node);
- cgraph_decide_inlining_incrementally (node);
+ cgraph_decide_inlining_incrementally (node, false);
}
if (decide_is_function_needed (node, decl))
/* Since we reclaim unreachable nodes at the end of every language
level unit, we need to be conservative about possible entry points
there. */
- if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl))
+ if ((TREE_PUBLIC (decl) && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl)))
cgraph_mark_reachable_node (node);
/* If not unit at a time, go ahead and emit everything we've found
do_warn_unused_parameter (decl);
}
-void
-cgraph_lower_function (struct cgraph_node *node)
-{
- if (node->lowered)
- return;
- tree_lowering_passes (node->decl);
- node->lowered = true;
-}
-
/* Walk tree and record all calls. Called via walk_tree. */
static tree
record_reference (tree *tp, int *walk_subtrees, void *data)
walk_tree (bsi_stmt_ptr (bsi), record_reference, node, visited_nodes);
}
- /* Walk over any private statics that may take addresses of functions. */
- if (TREE_CODE (DECL_INITIAL (body)) == BLOCK)
+ /* Look for initializers of constant variables and private statics. */
+ for (step = DECL_STRUCT_FUNCTION (body)->unexpanded_var_list;
+ step;
+ step = TREE_CHAIN (step))
{
- for (step = BLOCK_VARS (DECL_INITIAL (body));
- step;
- step = TREE_CHAIN (step))
- if (DECL_INITIAL (step))
- walk_tree (&DECL_INITIAL (step), record_reference, node, visited_nodes);
+ tree decl = TREE_VALUE (step);
+ if (TREE_CODE (decl) == VAR_DECL
+ && (TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
+ && flag_unit_at_a_time)
+ cgraph_varpool_finalize_decl (decl);
+ else if (TREE_CODE (decl) == VAR_DECL && DECL_INITIAL (decl))
+ walk_tree (&DECL_INITIAL (decl), record_reference, node, visited_nodes);
}
-
- /* Also look here for private statics. */
- if (DECL_STRUCT_FUNCTION (body))
- for (step = DECL_STRUCT_FUNCTION (body)->unexpanded_var_list;
- step;
- step = TREE_CHAIN (step))
- {
- tree decl = TREE_VALUE (step);
- if (DECL_INITIAL (decl) && TREE_STATIC (decl))
- walk_tree (&DECL_INITIAL (decl), record_reference, node, visited_nodes);
- }
pointer_set_destroy (visited_nodes);
visited_nodes = NULL;
}
+/* Give initial reasons why inlining would fail. Those gets
+ either NULLified or usually overwritten by more precise reason
+ later. */
+static void
+initialize_inline_failed (struct cgraph_node *node)
+{
+ struct cgraph_edge *e;
+
+ for (e = node->callers; e; e = e->next_caller)
+ {
+ gcc_assert (!e->callee->global.inlined_to);
+ gcc_assert (e->inline_failed);
+ if (node->local.redefined_extern_inline)
+ e->inline_failed = N_("redefined extern inline functions are not "
+ "considered for inlining");
+ else if (!node->local.inlinable)
+ e->inline_failed = N_("function not inlinable");
+ else
+ e->inline_failed = N_("function not considered for inlining");
+ }
+}
+
+/* Rebuild call edges from current function after a passes not aware
+ of cgraph updating. */
+static unsigned int
+rebuild_cgraph_edges (void)
+{
+ basic_block bb;
+ struct cgraph_node *node = cgraph_node (current_function_decl);
+ block_stmt_iterator bsi;
+
+ cgraph_node_remove_callees (node);
+
+ node->count = ENTRY_BLOCK_PTR->count;
+
+ FOR_EACH_BB (bb)
+ for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+ {
+ tree stmt = bsi_stmt (bsi);
+ tree call = get_call_expr_in (stmt);
+ tree decl;
+
+ if (call && (decl = get_callee_fndecl (call)))
+ cgraph_create_edge (node, cgraph_node (decl), stmt,
+ bb->count,
+ bb->loop_depth);
+ }
+ initialize_inline_failed (node);
+ gcc_assert (!node->global.inlined_to);
+ return 0;
+}
+
+struct tree_opt_pass pass_rebuild_cgraph_edges =
+{
+ NULL, /* name */
+ NULL, /* gate */
+ rebuild_cgraph_edges, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ 0, /* tv_id */
+ PROP_cfg, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ 0, /* todo_flags_finish */
+ 0 /* letter */
+};
/* Verify cgraph nodes of given cgraph node. */
void
for (e = node->callees; e; e = e->next_callee)
if (e->aux)
{
- error ("Aux field set for edge %s->%s",
+ error ("aux field set for edge %s->%s",
cgraph_node_name (e->caller), cgraph_node_name (e->callee));
error_found = true;
}
+ if (node->count < 0)
+ {
+ error ("Execution count is negative");
+ error_found = true;
+ }
for (e = node->callers; e; e = e->next_caller)
{
+ if (e->count < 0)
+ {
+ error ("caller edge count is negative");
+ error_found = true;
+ }
if (!e->inline_failed)
{
if (node->global.inlined_to
!= (e->caller->global.inlined_to
? e->caller->global.inlined_to : e->caller))
{
- error ("Inlined_to pointer is wrong");
+ error ("inlined_to pointer is wrong");
error_found = true;
}
if (node->callers->next_caller)
{
- error ("Multiple inline callers");
+ error ("multiple inline callers");
error_found = true;
}
}
else
if (node->global.inlined_to)
{
- error ("Inlined_to pointer set for noninline callers");
+ error ("inlined_to pointer set for noninline callers");
error_found = true;
}
}
if (!node->callers && node->global.inlined_to)
{
- error ("Inlined_to pointer is set but no predecesors found");
+ error ("inlined_to pointer is set but no predecesors found");
error_found = true;
}
if (node->global.inlined_to == node)
{
- error ("Inlined_to pointer refers to itself");
+ error ("inlined_to pointer refers to itself");
error_found = true;
}
break;
if (!node)
{
- error ("Node not found in DECL_ASSEMBLER_NAME hash");
+ error ("node not found in DECL_ASSEMBLER_NAME hash");
error_found = true;
}
{
if (e->aux)
{
- error ("Shared call_stmt:");
+ error ("shared call_stmt:");
debug_generic_stmt (stmt);
error_found = true;
}
- if (e->callee->decl != cgraph_node (decl)->decl)
+ if (e->callee->decl != cgraph_node (decl)->decl
+ && e->inline_failed)
{
- error ("Edge points to wrong declaration:");
+ error ("edge points to wrong declaration:");
debug_tree (e->callee->decl);
fprintf (stderr," Instead of:");
debug_tree (decl);
}
else
{
- error ("Missing callgraph edge for call stmt:");
+ error ("missing callgraph edge for call stmt:");
debug_generic_stmt (stmt);
error_found = true;
}
{
if (!e->aux)
{
- error ("Edge %s->%s has no corresponding call_stmt",
+ error ("edge %s->%s has no corresponding call_stmt",
cgraph_node_name (e->caller),
cgraph_node_name (e->callee));
debug_generic_stmt (e->call_stmt);
if (error_found)
{
dump_cgraph_node (stderr, node);
- internal_error ("verify_cgraph_node failed.");
+ internal_error ("verify_cgraph_node failed");
}
timevar_pop (TV_CGRAPH_VERIFY);
}
verify_cgraph_node (node);
}
+/* Output one variable, if necessary. Return whether we output it. */
+static bool
+cgraph_varpool_assemble_decl (struct cgraph_varpool_node *node)
+{
+ tree decl = node->decl;
+
+ if (!TREE_ASM_WRITTEN (decl)
+ && !node->alias
+ && !DECL_EXTERNAL (decl)
+ && (TREE_CODE (decl) != VAR_DECL || !DECL_HAS_VALUE_EXPR_P (decl)))
+ {
+ assemble_variable (decl, 0, 1, 0);
+ /* Local static variables are never seen by check_global_declarations
+ so we need to output debug info by hand. */
+ if (DECL_CONTEXT (decl)
+ && (TREE_CODE (DECL_CONTEXT (decl)) == BLOCK
+ || TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL)
+ && errorcount == 0 && sorrycount == 0)
+ {
+ timevar_push (TV_SYMOUT);
+ (*debug_hooks->global_decl) (decl);
+ timevar_pop (TV_SYMOUT);
+ }
+ return true;
+ }
+
+ return false;
+}
/* Output all variables enqueued to be assembled. */
bool
while (cgraph_varpool_nodes_queue)
{
- tree decl = cgraph_varpool_nodes_queue->decl;
struct cgraph_varpool_node *node = cgraph_varpool_nodes_queue;
cgraph_varpool_nodes_queue = cgraph_varpool_nodes_queue->next_needed;
- if (!TREE_ASM_WRITTEN (decl) && !node->alias && !DECL_EXTERNAL (decl))
- {
- assemble_variable (decl, 0, 1, 0);
- changed = true;
- }
+ if (cgraph_varpool_assemble_decl (node))
+ changed = true;
node->next_needed = NULL;
}
return changed;
}
-/* Analyze the function scheduled to be output. */
+/* Output all asm statements we have stored up to be output. */
+
static void
+cgraph_output_pending_asms (void)
+{
+ struct cgraph_asm_node *can;
+
+ if (errorcount || sorrycount)
+ return;
+
+ for (can = cgraph_asm_nodes; can; can = can->next)
+ assemble_asm (can->asm_str);
+ cgraph_asm_nodes = NULL;
+}
+
+/* Analyze the function scheduled to be output. */
+void
cgraph_analyze_function (struct cgraph_node *node)
{
tree decl = node->decl;
- struct cgraph_edge *e;
current_function_decl = decl;
push_cfun (DECL_STRUCT_FUNCTION (decl));
if (node->local.inlinable)
node->local.disregard_inline_limits
= lang_hooks.tree_inlining.disregard_inline_limits (decl);
- for (e = node->callers; e; e = e->next_caller)
- {
- if (node->local.redefined_extern_inline)
- e->inline_failed = N_("redefined extern inline functions are not "
- "considered for inlining");
- else if (!node->local.inlinable)
- e->inline_failed = N_("function not inlinable");
- else
- e->inline_failed = N_("function not considered for inlining");
- }
+ initialize_inline_failed (node);
if (flag_really_no_inline && !node->local.disregard_inline_limits)
node->local.inlinable = 0;
/* Inlining characteristics are maintained by the cgraph_mark_inline. */
if (!flag_unit_at_a_time)
{
+ cgraph_output_pending_asms ();
cgraph_assemble_pending_functions ();
return;
}
cgraph_expand_all_functions (void)
{
struct cgraph_node *node;
- struct cgraph_node **order =
- xcalloc (cgraph_n_nodes, sizeof (struct cgraph_node *));
+ struct cgraph_node **order = XCNEWVEC (struct cgraph_node *, cgraph_n_nodes);
int order_pos = 0, new_order_pos = 0;
int i;
cgraph_expand_function (node);
}
}
+
free (order);
+
+ /* Process CGRAPH_EXPAND_QUEUE, these are functions created during
+ the expansion process. Note that this queue may grow as its
+ being processed, as the new functions may generate new ones. */
+ while (cgraph_expand_queue)
+ {
+ node = cgraph_expand_queue;
+ cgraph_expand_queue = cgraph_expand_queue->next_needed;
+ node->next_needed = NULL;
+ node->output = 0;
+ node->lowered = DECL_STRUCT_FUNCTION (node->decl)->cfg != NULL;
+ cgraph_expand_function (node);
+ }
+}
+
+/* This is used to sort the node types by the cgraph order number. */
+
+struct cgraph_order_sort
+{
+ enum { ORDER_UNDEFINED = 0, ORDER_FUNCTION, ORDER_VAR, ORDER_ASM } kind;
+ union
+ {
+ struct cgraph_node *f;
+ struct cgraph_varpool_node *v;
+ struct cgraph_asm_node *a;
+ } u;
+};
+
+/* Output all functions, variables, and asm statements in the order
+ according to their order fields, which is the order in which they
+ appeared in the file. This implements -fno-toplevel-reorder. In
+ this mode we may output functions and variables which don't really
+ need to be output. */
+
+static void
+cgraph_output_in_order (void)
+{
+ int max;
+ size_t size;
+ struct cgraph_order_sort *nodes;
+ int i;
+ struct cgraph_node *pf;
+ struct cgraph_varpool_node *pv;
+ struct cgraph_asm_node *pa;
+
+ max = cgraph_order;
+ size = max * sizeof (struct cgraph_order_sort);
+ nodes = (struct cgraph_order_sort *) alloca (size);
+ memset (nodes, 0, size);
+
+ cgraph_varpool_analyze_pending_decls ();
+
+ for (pf = cgraph_nodes; pf; pf = pf->next)
+ {
+ if (pf->output)
+ {
+ i = pf->order;
+ gcc_assert (nodes[i].kind == ORDER_UNDEFINED);
+ nodes[i].kind = ORDER_FUNCTION;
+ nodes[i].u.f = pf;
+ }
+ }
+
+ for (pv = cgraph_varpool_nodes_queue; pv; pv = pv->next_needed)
+ {
+ i = pv->order;
+ gcc_assert (nodes[i].kind == ORDER_UNDEFINED);
+ nodes[i].kind = ORDER_VAR;
+ nodes[i].u.v = pv;
+ }
+
+ for (pa = cgraph_asm_nodes; pa; pa = pa->next)
+ {
+ i = pa->order;
+ gcc_assert (nodes[i].kind == ORDER_UNDEFINED);
+ nodes[i].kind = ORDER_ASM;
+ nodes[i].u.a = pa;
+ }
+
+ for (i = 0; i < max; ++i)
+ {
+ switch (nodes[i].kind)
+ {
+ case ORDER_FUNCTION:
+ nodes[i].u.f->output = 0;
+ cgraph_expand_function (nodes[i].u.f);
+ break;
+
+ case ORDER_VAR:
+ cgraph_varpool_assemble_decl (nodes[i].u.v);
+ break;
+
+ case ORDER_ASM:
+ assemble_asm (nodes[i].u.a->asm_str);
+ break;
+
+ case ORDER_UNDEFINED:
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
+ }
+
+ cgraph_asm_nodes = NULL;
}
/* Mark visibility of all functions.
{
if (node->reachable
&& (DECL_COMDAT (node->decl)
- || (TREE_PUBLIC (node->decl) && !DECL_EXTERNAL (node->decl))))
- node->local.externally_visible = 1;
+ || (!flag_whole_program
+ && TREE_PUBLIC (node->decl) && !DECL_EXTERNAL (node->decl))))
+ node->local.externally_visible = true;
+ if (!node->local.externally_visible && node->analyzed
+ && !DECL_EXTERNAL (node->decl))
+ {
+ gcc_assert (flag_whole_program || !TREE_PUBLIC (node->decl));
+ TREE_PUBLIC (node->decl) = 0;
+ }
node->local.local = (!node->needed
&& node->analyzed
&& !DECL_EXTERNAL (node->decl)
for (vnode = cgraph_varpool_nodes_queue; vnode; vnode = vnode->next_needed)
{
if (vnode->needed
+ && !flag_whole_program
&& (DECL_COMDAT (vnode->decl) || TREE_PUBLIC (vnode->decl)))
vnode->externally_visible = 1;
+ if (!vnode->externally_visible)
+ {
+ gcc_assert (flag_whole_program || !TREE_PUBLIC (vnode->decl));
+ TREE_PUBLIC (vnode->decl) = 0;
+ }
gcc_assert (TREE_STATIC (vnode->decl));
}
cgraph_preserve_function_body_p (tree decl)
{
struct cgraph_node *node;
- /* Keep the body; we're going to dump it. */
- if (dump_enabled_p (TDI_tree_all))
- return true;
if (!cgraph_global_info_ready)
return (DECL_INLINE (decl) && !flag_really_no_inline);
/* Look if there is any clone around. */
return false;
}
+static void
+ipa_passes (void)
+{
+ cfun = NULL;
+ tree_register_cfg_hooks ();
+ bitmap_obstack_initialize (NULL);
+ execute_ipa_pass_list (all_ipa_passes);
+ bitmap_obstack_release (NULL);
+}
+
/* Perform simple optimizations based on callgraph. */
void
#endif
if (!flag_unit_at_a_time)
{
+ cgraph_output_pending_asms ();
cgraph_varpool_assemble_pending_decls ();
return;
}
#ifdef ENABLE_CHECKING
verify_cgraph ();
#endif
-
+
cgraph_mark_functions_to_output ();
- cgraph_expand_all_functions ();
- cgraph_varpool_remove_unreferenced_decls ();
- cgraph_varpool_assemble_pending_decls ();
+ if (!flag_toplevel_reorder)
+ cgraph_output_in_order ();
+ else
+ {
+ cgraph_output_pending_asms ();
+
+ cgraph_expand_all_functions ();
+ cgraph_varpool_remove_unreferenced_decls ();
+
+ cgraph_varpool_assemble_pending_decls ();
+ }
if (cgraph_dump_file)
{
dump_cgraph_node (stderr, node);
}
if (error_found)
- internal_error ("Nodes with no released memory found.");
+ internal_error ("nodes with no released memory found");
}
#endif
}
{
cgraph_dump_file = dump_begin (TDI_cgraph, NULL);
}
+
+/* The edges representing the callers of the NEW_VERSION node were
+ fixed by cgraph_function_versioning (), now the call_expr in their
+ respective tree code should be updated to call the NEW_VERSION. */
+
+static void
+update_call_expr (struct cgraph_node *new_version)
+{
+ struct cgraph_edge *e;
+
+ gcc_assert (new_version);
+ for (e = new_version->callers; e; e = e->next_caller)
+ /* Update the call expr on the edges
+ to call the new version. */
+ TREE_OPERAND (TREE_OPERAND (get_call_expr_in (e->call_stmt), 0), 0) = new_version->decl;
+}
+
+
+/* Create a new cgraph node which is the new version of
+ OLD_VERSION node. REDIRECT_CALLERS holds the callers
+ edges which should be redirected to point to
+ NEW_VERSION. ALL the callees edges of OLD_VERSION
+ are cloned to the new version node. Return the new
+ version node. */
+
+static struct cgraph_node *
+cgraph_copy_node_for_versioning (struct cgraph_node *old_version,
+ tree new_decl,
+ VEC(cgraph_edge_p,heap) *redirect_callers)
+ {
+ struct cgraph_node *new_version;
+ struct cgraph_edge *e, *new_e;
+ struct cgraph_edge *next_callee;
+ unsigned i;
+
+ gcc_assert (old_version);
+
+ new_version = cgraph_node (new_decl);
+
+ new_version->analyzed = true;
+ new_version->local = old_version->local;
+ new_version->global = old_version->global;
+ new_version->rtl = new_version->rtl;
+ new_version->reachable = true;
+ new_version->count = old_version->count;
+
+ /* Clone the old node callees. Recursive calls are
+ also cloned. */
+ for (e = old_version->callees;e; e=e->next_callee)
+ {
+ new_e = cgraph_clone_edge (e, new_version, e->call_stmt, 0, e->loop_nest, true);
+ new_e->count = e->count;
+ }
+ /* Fix recursive calls.
+ If OLD_VERSION has a recursive call after the
+ previous edge cloning, the new version will have an edge
+ pointing to the old version, which is wrong;
+ Redirect it to point to the new version. */
+ for (e = new_version->callees ; e; e = next_callee)
+ {
+ next_callee = e->next_callee;
+ if (e->callee == old_version)
+ cgraph_redirect_edge_callee (e, new_version);
+
+ if (!next_callee)
+ break;
+ }
+ for (i = 0; VEC_iterate (cgraph_edge_p, redirect_callers, i, e); i++)
+ {
+ /* Redirect calls to the old version node to point to its new
+ version. */
+ cgraph_redirect_edge_callee (e, new_version);
+ }
+
+ return new_version;
+ }
+
+ /* Perform function versioning.
+ Function versioning includes copying of the tree and
+ a callgraph update (creating a new cgraph node and updating
+ its callees and callers).
+
+ REDIRECT_CALLERS varray includes the edges to be redirected
+ to the new version.
+
+ TREE_MAP is a mapping of tree nodes we want to replace with
+ new ones (according to results of prior analysis).
+ OLD_VERSION_NODE is the node that is versioned.
+ It returns the new version's cgraph node. */
+
+struct cgraph_node *
+cgraph_function_versioning (struct cgraph_node *old_version_node,
+ VEC(cgraph_edge_p,heap) *redirect_callers,
+ varray_type tree_map)
+{
+ tree old_decl = old_version_node->decl;
+ struct cgraph_node *new_version_node = NULL;
+ tree new_decl;
+
+ if (!tree_versionable_function_p (old_decl))
+ return NULL;
+
+ /* Make a new FUNCTION_DECL tree node for the
+ new version. */
+ new_decl = copy_node (old_decl);
+
+ /* Create the new version's call-graph node.
+ and update the edges of the new node. */
+ new_version_node =
+ cgraph_copy_node_for_versioning (old_version_node, new_decl,
+ redirect_callers);
+
+ /* Copy the OLD_VERSION_NODE function tree to the new version. */
+ tree_function_versioning (old_decl, new_decl, tree_map, false);
+ /* Update the call_expr on the edges to call the new version node. */
+ update_call_expr (new_version_node);
+
+ /* Update the new version's properties.
+ Make The new version visible only within this translation unit.
+ ??? We cannot use COMDAT linkage because there is no
+ ABI support for this. */
+ DECL_EXTERNAL (new_version_node->decl) = 0;
+ DECL_ONE_ONLY (new_version_node->decl) = 0;
+ TREE_PUBLIC (new_version_node->decl) = 0;
+ DECL_COMDAT (new_version_node->decl) = 0;
+ new_version_node->local.externally_visible = 0;
+ new_version_node->local.local = 1;
+ new_version_node->lowered = true;
+ return new_version_node;
+}
+
+/* Produce separate function body for inline clones so the offline copy can be
+ modified without affecting them. */
+struct cgraph_node *
+save_inline_function_body (struct cgraph_node *node)
+{
+ struct cgraph_node *first_clone;
+
+ gcc_assert (node == cgraph_node (node->decl));
+
+ cgraph_lower_function (node);
+
+ /* In non-unit-at-a-time we construct full fledged clone we never output to
+ assembly file. This clone is pointed out by inline_decl of original function
+ and inlining infrastructure knows how to deal with this. */
+ if (!flag_unit_at_a_time)
+ {
+ struct cgraph_edge *e;
+
+ first_clone = cgraph_clone_node (node, node->count, 0, false);
+ first_clone->needed = 0;
+ first_clone->reachable = 1;
+ /* Recursively clone all bodies. */
+ for (e = first_clone->callees; e; e = e->next_callee)
+ if (!e->inline_failed)
+ cgraph_clone_inlined_nodes (e, true, false);
+ }
+ else
+ first_clone = node->next_clone;
+
+ first_clone->decl = copy_node (node->decl);
+ node->next_clone = NULL;
+ if (!flag_unit_at_a_time)
+ node->inline_decl = first_clone->decl;
+ first_clone->prev_clone = NULL;
+ cgraph_insert_node_to_hashtable (first_clone);
+ gcc_assert (first_clone == cgraph_node (first_clone->decl));
+
+ /* Copy the OLD_VERSION_NODE function tree to the new version. */
+ tree_function_versioning (node->decl, first_clone->decl, NULL, true);
+
+ DECL_EXTERNAL (first_clone->decl) = 0;
+ DECL_ONE_ONLY (first_clone->decl) = 0;
+ TREE_PUBLIC (first_clone->decl) = 0;
+ DECL_COMDAT (first_clone->decl) = 0;
+
+ for (node = first_clone->next_clone; node; node = node->next_clone)
+ node->decl = first_clone->decl;
+#ifdef ENABLE_CHECKING
+ verify_cgraph_node (first_clone);
+#endif
+ return first_clone;
+}
+
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