#include "tree-flow.h"
#include "value-prof.h"
#include "except.h"
-#include "diagnostic.h"
+#include "diagnostic-core.h"
#include "rtl.h"
+#include "ipa-utils.h"
+#include "lto-streamer.h"
+
+const char * const ld_plugin_symbol_resolution_names[]=
+{
+ "",
+ "undef",
+ "prevailing_def",
+ "prevailing_def_ironly",
+ "preempted_reg",
+ "preempted_ir",
+ "resolved_ir",
+ "resolved_exec",
+ "resolved_dyn"
+};
static void cgraph_node_remove_callers (struct cgraph_node *node);
static inline void cgraph_edge_remove_caller (struct cgraph_edge *e);
}
else
{
- node = GGC_CNEW (struct cgraph_node);
+ node = ggc_alloc_cleared_cgraph_node ();
node->uid = cgraph_max_uid++;
}
node->previous = NULL;
node->global.estimated_growth = INT_MIN;
node->frequency = NODE_FREQUENCY_NORMAL;
+ node->count_materialization_scale = REG_BR_PROB_BASE;
+ ipa_empty_ref_list (&node->ref_list);
cgraph_nodes = node;
cgraph_n_nodes++;
return node;
return alias_node;
}
-/* Attempt to mark ALIAS as an alias to DECL. Return TRUE if successful.
+/* Attempt to mark ALIAS as an alias to DECL. Return alias node if successful
+ and NULL otherwise.
Same body aliases are output whenever the body of DECL is output,
and cgraph_node (ALIAS) transparently returns cgraph_node (DECL). */
-bool
+struct cgraph_node *
cgraph_same_body_alias (tree alias, tree decl)
{
#ifndef ASM_OUTPUT_DEF
/* If aliases aren't supported by the assembler, fail. */
- return false;
+ return NULL;
#endif
/*gcc_assert (!assembler_name_hash);*/
- return cgraph_same_body_alias_1 (alias, decl) != NULL;
+ return cgraph_same_body_alias_1 (alias, decl);
}
-void
+/* Add thunk alias into callgraph. The alias declaration is ALIAS and it
+ alises DECL with an adjustments made into the first parameter.
+ See comments in thunk_adjust for detail on the parameters. */
+
+struct cgraph_node *
cgraph_add_thunk (tree alias, tree decl, bool this_adjusting,
HOST_WIDE_INT fixed_offset, HOST_WIDE_INT virtual_value,
tree virtual_offset,
node = cgraph_same_body_alias_1 (alias, decl);
gcc_assert (node);
-#ifdef ENABLE_CHECKING
- gcc_assert (!virtual_offset
- || tree_int_cst_equal (virtual_offset, size_int (virtual_value)));
-#endif
+ gcc_checking_assert (!virtual_offset
+ || tree_int_cst_equal (virtual_offset,
+ size_int (virtual_value)));
node->thunk.fixed_offset = fixed_offset;
node->thunk.this_adjusting = this_adjusting;
node->thunk.virtual_value = virtual_value;
node->thunk.virtual_offset_p = virtual_offset != NULL;
node->thunk.alias = real_alias;
node->thunk.thunk_p = true;
+ return node;
}
/* Returns the cgraph node assigned to DECL or NULL if no cgraph node
is assigned. */
struct cgraph_node *
-cgraph_get_node (tree decl)
+cgraph_get_node_or_alias (const_tree decl)
{
struct cgraph_node key, *node = NULL, **slot;
if (!cgraph_hash)
return NULL;
- key.decl = decl;
+ key.decl = CONST_CAST2 (tree, const_tree, decl);
+
+ slot = (struct cgraph_node **) htab_find_slot (cgraph_hash, &key,
+ NO_INSERT);
+
+ if (slot && *slot)
+ node = *slot;
+ return node;
+}
+
+/* Returns the cgraph node assigned to DECL or NULL if no cgraph node
+ is assigned. */
+
+struct cgraph_node *
+cgraph_get_node (const_tree decl)
+{
+ struct cgraph_node key, *node = NULL, **slot;
+
+ gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
+
+ if (!cgraph_hash)
+ return NULL;
+
+ key.decl = CONST_CAST2 (tree, const_tree, decl);
slot = (struct cgraph_node **) htab_find_slot (cgraph_hash, &key,
NO_INSERT);
have not been loaded yet. */
if (call_stmt)
{
-#ifdef ENABLE_CHECKING
- /* This is rather pricely check possibly trigerring construction of
- call stmt hashtable. */
- gcc_assert (!cgraph_edge (caller, call_stmt));
-#endif
+ /* This is a rather expensive check possibly trigerring
+ construction of call stmt hashtable. */
+ gcc_checking_assert (!cgraph_edge (caller, call_stmt));
gcc_assert (is_gimple_call (call_stmt));
}
}
else
{
- edge = GGC_NEW (struct cgraph_edge);
+ edge = ggc_alloc_cgraph_edge ();
edge->uid = cgraph_edge_max_uid++;
}
struct cgraph_edge *
cgraph_create_indirect_edge (struct cgraph_node *caller, gimple call_stmt,
+ int ecf_flags,
gcov_type count, int freq, int nest)
{
struct cgraph_edge *edge = cgraph_create_edge_1 (caller, NULL, call_stmt,
edge->indirect_unknown_callee = 1;
initialize_inline_failed (edge);
- edge->indirect_info = GGC_NEW (struct cgraph_indirect_call_info);
+ edge->indirect_info = ggc_alloc_cleared_cgraph_indirect_call_info ();
edge->indirect_info->param_index = -1;
+ edge->indirect_info->ecf_flags = ecf_flags;
edge->next_callee = caller->indirect_calls;
if (caller->indirect_calls)
{
/* See if the edge is already there and has the correct callee. It
might be so because of indirect inlining has already updated
- it. */
- if (new_call && e->callee && e->callee->decl == new_call)
- return;
+ it. We also might've cloned and redirected the edge. */
+ if (new_call && e->callee)
+ {
+ struct cgraph_node *callee = e->callee;
+ while (callee)
+ {
+ if (callee->decl == new_call
+ || callee->former_clone_of == new_call)
+ return;
+ callee = callee->clone_of;
+ }
+ }
/* Otherwise remove edge and create new one; we can't simply redirect
since function has changed, so inline plan and other information
cgraph_edge_remove_callee (e);
cgraph_free_edge (e);
}
+ for (e = node->indirect_calls; e; e = f)
+ {
+ f = e->next_callee;
+ cgraph_call_edge_removal_hooks (e);
+ if (!e->indirect_unknown_callee)
+ cgraph_edge_remove_callee (e);
+ cgraph_free_edge (e);
+ }
+ node->indirect_calls = NULL;
node->callees = NULL;
if (node->call_site_hash)
{
cgraph_call_node_removal_hooks (node);
cgraph_node_remove_callers (node);
cgraph_node_remove_callees (node);
+ ipa_remove_all_references (&node->ref_list);
+ ipa_remove_all_refering (&node->ref_list);
VEC_free (ipa_opt_pass, heap,
node->ipa_transforms_to_apply);
{
if (!node->reachable && node->local.finalized)
{
- notice_global_symbol (node->decl);
+ if (cgraph_global_info_ready)
+ {
+ /* Verify that function does not appear to be needed out of blue
+ during the optimization process. This can happen for extern
+ inlines when bodies was removed after inlining. */
+ gcc_assert ((node->analyzed || node->in_other_partition
+ || DECL_EXTERNAL (node->decl)));
+ }
+ else
+ notice_global_symbol (node->decl);
node->reachable = 1;
- gcc_assert (!cgraph_global_info_ready);
node->next_needed = cgraph_nodes_queue;
cgraph_nodes_queue = node;
void
cgraph_mark_address_taken_node (struct cgraph_node *node)
{
+ gcc_assert (!node->global.inlined_to);
+ cgraph_mark_reachable_node (node);
node->address_taken = 1;
- cgraph_mark_needed_node (node);
}
/* Return local info for the compiled function. */
fprintf (f, " (inline copy in %s/%i)",
cgraph_node_name (node->global.inlined_to),
node->global.inlined_to->uid);
+ if (node->same_comdat_group)
+ fprintf (f, " (same comdat group as %s/%i)",
+ cgraph_node_name (node->same_comdat_group),
+ node->same_comdat_group->uid);
if (node->clone_of)
fprintf (f, " (clone of %s/%i)",
cgraph_node_name (node->clone_of),
fprintf (f, " local");
if (node->local.externally_visible)
fprintf (f, " externally_visible");
+ if (node->resolution != LDPR_UNKNOWN)
+ fprintf (f, " %s",
+ ld_plugin_symbol_resolution_names[(int)node->resolution]);
if (node->local.finalized)
fprintf (f, " finalized");
if (node->local.disregard_inline_limits)
fprintf (f, " always_inline");
else if (node->local.inlinable)
fprintf (f, " inlinable");
+ else if (node->local.versionable)
+ fprintf (f, " versionable");
if (node->local.redefined_extern_inline)
fprintf (f, " redefined_extern_inline");
if (TREE_ASM_WRITTEN (node->decl))
fprintf (f, " asm_written");
+ if (node->only_called_at_startup)
+ fprintf (f, " only_called_at_startup");
+ if (node->only_called_at_exit)
+ fprintf (f, " only_called_at_exit");
fprintf (f, "\n called by: ");
for (edge = node->callers; edge; edge = edge->next_caller)
fprintf(f, "(can throw external) ");
}
fprintf (f, "\n");
+ fprintf (f, " References: ");
+ ipa_dump_references (f, &node->ref_list);
+ fprintf (f, " Refering this function: ");
+ ipa_dump_refering (f, &node->ref_list);
for (edge = node->indirect_calls; edge; edge = edge->next_callee)
indirect_calls_count++;
(int)n->thunk.virtual_offset_p);
fprintf (f, ")");
}
+ if (DECL_ASSEMBLER_NAME_SET_P (n->decl))
+ fprintf (f, " (asm: %s)", IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (n->decl)));
}
fprintf (f, "\n");
}
/* Dump call graph node NODE to stderr. */
-void
+DEBUG_FUNCTION void
debug_cgraph_node (struct cgraph_node *node)
{
dump_cgraph_node (stderr, node);
/* Dump the call graph to stderr. */
-void
+DEBUG_FUNCTION void
debug_cgraph (void)
{
dump_cgraph (stderr);
void
change_decl_assembler_name (tree decl, tree name)
{
- gcc_assert (!assembler_name_hash);
+ struct cgraph_node *node;
+ void **slot;
if (!DECL_ASSEMBLER_NAME_SET_P (decl))
+ SET_DECL_ASSEMBLER_NAME (decl, name);
+ else
{
- SET_DECL_ASSEMBLER_NAME (decl, name);
- return;
- }
- if (name == DECL_ASSEMBLER_NAME (decl))
- return;
+ if (name == DECL_ASSEMBLER_NAME (decl))
+ return;
- if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
- && DECL_RTL_SET_P (decl))
- warning (0, "%D renamed after being referenced in assembly", decl);
+ if (assembler_name_hash
+ && TREE_CODE (decl) == FUNCTION_DECL
+ && (node = cgraph_get_node_or_alias (decl)) != NULL)
+ {
+ tree old_name = DECL_ASSEMBLER_NAME (decl);
+ slot = htab_find_slot_with_hash (assembler_name_hash, old_name,
+ decl_assembler_name_hash (old_name),
+ NO_INSERT);
+ /* Inline clones are not hashed. */
+ if (slot && *slot == node)
+ htab_clear_slot (assembler_name_hash, slot);
+ }
+ if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
+ && DECL_RTL_SET_P (decl))
+ warning (0, "%D renamed after being referenced in assembly", decl);
- SET_DECL_ASSEMBLER_NAME (decl, name);
+ SET_DECL_ASSEMBLER_NAME (decl, name);
+ }
+ if (assembler_name_hash
+ && TREE_CODE (decl) == FUNCTION_DECL
+ && (node = cgraph_get_node_or_alias (decl)) != NULL)
+ {
+ slot = htab_find_slot_with_hash (assembler_name_hash, name,
+ decl_assembler_name_hash (name),
+ INSERT);
+ gcc_assert (!*slot);
+ *slot = node;
+ }
}
/* Add a top-level asm statement to the list. */
{
struct cgraph_asm_node *node;
- node = GGC_CNEW (struct cgraph_asm_node);
+ node = ggc_alloc_cleared_cgraph_asm_node ();
node->asm_str = asm_str;
node->order = cgraph_order++;
node->next = NULL;
}
else
{
- new_edge = cgraph_create_indirect_edge (n, call_stmt, count, freq,
+ new_edge = cgraph_create_indirect_edge (n, call_stmt,
+ e->indirect_info->ecf_flags,
+ count, freq,
e->loop_nest + loop_nest);
- new_edge->indirect_info->param_index = e->indirect_info->param_index;
+ *new_edge->indirect_info = *e->indirect_info;
}
}
else
new_edge->inline_failed = e->inline_failed;
new_edge->indirect_inlining_edge = e->indirect_inlining_edge;
new_edge->lto_stmt_uid = stmt_uid;
+ /* Clone flags that depend on call_stmt availability manually. */
+ new_edge->can_throw_external = e->can_throw_external;
+ new_edge->call_stmt_cannot_inline_p = e->call_stmt_cannot_inline_p;
if (update_original)
{
e->count -= new_edge->count;
/* Create node representing clone of N executed COUNT times. Decrease
the execution counts from original node too.
+ The new clone will have decl set to DECL that may or may not be the same
+ as decl of N.
When UPDATE_ORIGINAL is true, the counts are subtracted from the original
function's profile to reflect the fact that part of execution is handled
by node. */
struct cgraph_node *
-cgraph_clone_node (struct cgraph_node *n, gcov_type count, int freq,
+cgraph_clone_node (struct cgraph_node *n, tree decl, gcov_type count, int freq,
int loop_nest, bool update_original,
VEC(cgraph_edge_p,heap) *redirect_callers)
{
gcov_type count_scale;
unsigned i;
- new_node->decl = n->decl;
+ new_node->decl = decl;
new_node->origin = n->origin;
if (new_node->origin)
{
n->count = 0;
}
- for (i = 0; VEC_iterate (cgraph_edge_p, redirect_callers, i, e); i++)
+ FOR_EACH_VEC_ELT (cgraph_edge_p, redirect_callers, i, e)
{
/* Redirect calls to the old version node to point to its new
version. */
for (e = n->indirect_calls; e; e = e->next_callee)
cgraph_clone_edge (e, new_node, e->call_stmt, e->lto_stmt_uid,
count_scale, freq, loop_nest, update_original);
+ ipa_clone_references (new_node, NULL, &n->ref_list);
new_node->next_sibling_clone = n->clones;
if (n->clones)
new_node->clone_of = n;
cgraph_call_node_duplication_hooks (n, new_node);
+ if (n->decl != decl)
+ {
+ struct cgraph_node **slot;
+ slot = (struct cgraph_node **) htab_find_slot (cgraph_hash, new_node, INSERT);
+ gcc_assert (!*slot);
+ *slot = new_node;
+ if (assembler_name_hash)
+ {
+ void **aslot;
+ tree name = DECL_ASSEMBLER_NAME (decl);
+
+ aslot = htab_find_slot_with_hash (assembler_name_hash, name,
+ decl_assembler_name_hash (name),
+ INSERT);
+ gcc_assert (!*aslot);
+ *aslot = new_node;
+ }
+ }
return new_node;
}
-/* Create a new name for omp child function. Returns an identifier. */
+/* Create a new name for clone of DECL, add SUFFIX. Returns an identifier. */
static GTY(()) unsigned int clone_fn_id_num;
-static tree
-clone_function_name (tree decl)
+tree
+clone_function_name (tree decl, const char *suffix)
{
tree name = DECL_ASSEMBLER_NAME (decl);
size_t len = IDENTIFIER_LENGTH (name);
char *tmp_name, *prefix;
- prefix = XALLOCAVEC (char, len + strlen ("_clone") + 1);
+ prefix = XALLOCAVEC (char, len + strlen (suffix) + 2);
memcpy (prefix, IDENTIFIER_POINTER (name), len);
- strcpy (prefix + len, "_clone");
+ strcpy (prefix + len + 1, suffix);
#ifndef NO_DOT_IN_LABEL
prefix[len] = '.';
#elif !defined NO_DOLLAR_IN_LABEL
prefix[len] = '$';
+#else
+ prefix[len] = '_';
#endif
ASM_FORMAT_PRIVATE_NAME (tmp_name, prefix, clone_fn_id_num++);
return get_identifier (tmp_name);
cgraph_create_virtual_clone (struct cgraph_node *old_node,
VEC(cgraph_edge_p,heap) *redirect_callers,
VEC(ipa_replace_map_p,gc) *tree_map,
- bitmap args_to_skip)
+ bitmap args_to_skip,
+ const char * suffix)
{
tree old_decl = old_node->decl;
struct cgraph_node *new_node = NULL;
tree new_decl;
- struct cgraph_node key, **slot;
+ size_t i;
+ struct ipa_replace_map *map;
- gcc_assert (tree_versionable_function_p (old_decl));
+ if (!flag_wpa)
+ gcc_checking_assert (tree_versionable_function_p (old_decl));
/* Make a new FUNCTION_DECL tree node */
if (!args_to_skip)
DECL_STRUCT_FUNCTION (new_decl) = NULL;
/* Generate a new name for the new version. */
- DECL_NAME (new_decl) = clone_function_name (old_decl);
+ DECL_NAME (new_decl) = clone_function_name (old_decl, suffix);
SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl));
SET_DECL_RTL (new_decl, NULL);
- new_node = cgraph_clone_node (old_node, old_node->count,
+ new_node = cgraph_clone_node (old_node, new_decl, old_node->count,
CGRAPH_FREQ_BASE, 0, false,
redirect_callers);
- new_node->decl = new_decl;
/* Update the properties.
Make clone visible only within this translation unit. Make sure
that is not weak also.
??? We cannot use COMDAT linkage because there is no
ABI support for this. */
DECL_EXTERNAL (new_node->decl) = 0;
+ if (DECL_ONE_ONLY (old_decl))
+ DECL_SECTION_NAME (new_node->decl) = NULL;
DECL_COMDAT_GROUP (new_node->decl) = 0;
TREE_PUBLIC (new_node->decl) = 0;
DECL_COMDAT (new_node->decl) = 0;
DECL_WEAK (new_node->decl) = 0;
new_node->clone.tree_map = tree_map;
new_node->clone.args_to_skip = args_to_skip;
+ FOR_EACH_VEC_ELT (ipa_replace_map_p, tree_map, i, map)
+ {
+ tree var = map->new_tree;
+
+ STRIP_NOPS (var);
+ if (TREE_CODE (var) != ADDR_EXPR)
+ continue;
+ var = get_base_var (var);
+ if (!var)
+ continue;
+
+ /* Record references of the future statement initializing the constant
+ argument. */
+ if (TREE_CODE (var) == FUNCTION_DECL)
+ ipa_record_reference (new_node, NULL, cgraph_node (var),
+ NULL, IPA_REF_ADDR, NULL);
+ else if (TREE_CODE (var) == VAR_DECL)
+ ipa_record_reference (new_node, NULL, NULL, varpool_node (var),
+ IPA_REF_ADDR, NULL);
+ }
if (!args_to_skip)
new_node->clone.combined_args_to_skip = old_node->clone.combined_args_to_skip;
else if (old_node->clone.combined_args_to_skip)
struct cgraph_node *orig_node;
for (orig_node = old_node; orig_node->clone_of; orig_node = orig_node->clone_of)
;
- for (arg = DECL_ARGUMENTS (orig_node->decl); arg; arg = TREE_CHAIN (arg), oldi++)
+ for (arg = DECL_ARGUMENTS (orig_node->decl); arg; arg = DECL_CHAIN (arg), oldi++)
{
if (bitmap_bit_p (old_node->clone.combined_args_to_skip, oldi))
{
new_node->lowered = true;
new_node->reachable = true;
- key.decl = new_decl;
- slot = (struct cgraph_node **) htab_find_slot (cgraph_hash, &key, INSERT);
- gcc_assert (!*slot);
- *slot = new_node;
- if (assembler_name_hash)
- {
- void **aslot;
- tree name = DECL_ASSEMBLER_NAME (new_decl);
-
- aslot = htab_find_slot_with_hash (assembler_name_hash, name,
- decl_assembler_name_hash (name),
- INSERT);
- gcc_assert (!*aslot);
- *aslot = new_node;
- }
return new_node;
}
AVAIL_AVAILABLE here? That would be good reason to preserve this
bit. */
- else if (DECL_REPLACEABLE_P (node->decl) && !DECL_EXTERNAL (node->decl))
+ else if (decl_replaceable_p (node->decl) && !DECL_EXTERNAL (node->decl))
avail = AVAIL_OVERWRITABLE;
else avail = AVAIL_AVAILABLE;
bool
cgraph_node_can_be_local_p (struct cgraph_node *node)
{
- return (!node->needed
+ return (!node->needed && !node->address_taken
&& ((DECL_COMDAT (node->decl) && !node->same_comdat_group)
|| !node->local.externally_visible));
}
if (TREE_CODE (decl) == VAR_DECL)
DECL_COMMON (decl) = 0;
- else if (TREE_CODE (decl) == FUNCTION_DECL)
+ else gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
+
+ if (DECL_COMDAT (decl))
{
+ /* It is possible that we are linking against library defining same COMDAT
+ function. To avoid conflict we need to rename our local name of the
+ function just in the case WHOPR partitioning decide to make it hidden
+ to avoid cross partition references. */
+ if (flag_wpa)
+ {
+ const char *old_name;
+
+ old_name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
+ if (TREE_CODE (decl) == FUNCTION_DECL)
+ {
+ struct cgraph_node *node = cgraph_get_node_or_alias (decl);
+ change_decl_assembler_name (decl,
+ clone_function_name (decl, "local"));
+ if (node->local.lto_file_data)
+ lto_record_renamed_decl (node->local.lto_file_data,
+ old_name,
+ IDENTIFIER_POINTER
+ (DECL_ASSEMBLER_NAME (decl)));
+ }
+ else if (TREE_CODE (decl) == VAR_DECL)
+ {
+ struct varpool_node *vnode = varpool_get_node (decl);
+ /* change_decl_assembler_name will warn here on vtables because
+ C++ frontend still sets TREE_SYMBOL_REFERENCED on them. */
+ SET_DECL_ASSEMBLER_NAME (decl,
+ clone_function_name (decl, "local"));
+ if (vnode->lto_file_data)
+ lto_record_renamed_decl (vnode->lto_file_data,
+ old_name,
+ IDENTIFIER_POINTER
+ (DECL_ASSEMBLER_NAME (decl)));
+ }
+ }
+ DECL_SECTION_NAME (decl) = 0;
DECL_COMDAT (decl) = 0;
- DECL_COMDAT_GROUP (decl) = 0;
- DECL_WEAK (decl) = 0;
- DECL_EXTERNAL (decl) = 0;
}
- else
- gcc_unreachable ();
+ DECL_COMDAT_GROUP (decl) = 0;
+ DECL_WEAK (decl) = 0;
+ DECL_EXTERNAL (decl) = 0;
TREE_PUBLIC (decl) = 0;
if (!DECL_RTL_SET_P (decl))
return;
node->local.externally_visible = false;
node->local.local = true;
+ node->resolution = LDPR_PREVAILING_DEF_IRONLY;
gcc_assert (cgraph_function_body_availability (node) == AVAIL_LOCAL);
}
}
if any to READONLY. */
void
-cgraph_set_readonly_flag (struct cgraph_node *node, bool readonly)
+cgraph_set_const_flag (struct cgraph_node *node, bool readonly, bool looping)
{
struct cgraph_node *alias;
+ /* Static constructors and destructors without a side effect can be
+ optimized out. */
+ if (!looping && readonly)
+ {
+ if (DECL_STATIC_CONSTRUCTOR (node->decl))
+ DECL_STATIC_CONSTRUCTOR (node->decl) = 0;
+ if (DECL_STATIC_DESTRUCTOR (node->decl))
+ DECL_STATIC_DESTRUCTOR (node->decl) = 0;
+ }
TREE_READONLY (node->decl) = readonly;
+ DECL_LOOPING_CONST_OR_PURE_P (node->decl) = looping;
for (alias = node->same_body; alias; alias = alias->next)
- TREE_READONLY (alias->decl) = readonly;
+ {
+ TREE_READONLY (alias->decl) = readonly;
+ DECL_LOOPING_CONST_OR_PURE_P (alias->decl) = looping;
+ }
}
/* Set DECL_PURE_P on NODE's decl and on same_body aliases of NODE
if any to PURE. */
void
-cgraph_set_pure_flag (struct cgraph_node *node, bool pure)
+cgraph_set_pure_flag (struct cgraph_node *node, bool pure, bool looping)
{
struct cgraph_node *alias;
+ /* Static constructors and destructors without a side effect can be
+ optimized out. */
+ if (!looping && pure)
+ {
+ if (DECL_STATIC_CONSTRUCTOR (node->decl))
+ DECL_STATIC_CONSTRUCTOR (node->decl) = 0;
+ if (DECL_STATIC_DESTRUCTOR (node->decl))
+ DECL_STATIC_DESTRUCTOR (node->decl) = 0;
+ }
DECL_PURE_P (node->decl) = pure;
+ DECL_LOOPING_CONST_OR_PURE_P (node->decl) = looping;
for (alias = node->same_body; alias; alias = alias->next)
- DECL_PURE_P (alias->decl) = pure;
-}
-
-/* Set DECL_LOOPING_CONST_OR_PURE_P on NODE's decl and on
- same_body aliases of NODE if any to LOOPING_CONST_OR_PURE. */
-
-void
-cgraph_set_looping_const_or_pure_flag (struct cgraph_node *node,
- bool looping_const_or_pure)
-{
- struct cgraph_node *alias;
- DECL_LOOPING_CONST_OR_PURE_P (node->decl) = looping_const_or_pure;
- for (alias = node->same_body; alias; alias = alias->next)
- DECL_LOOPING_CONST_OR_PURE_P (alias->decl) = looping_const_or_pure;
+ {
+ DECL_PURE_P (alias->decl) = pure;
+ DECL_LOOPING_CONST_OR_PURE_P (alias->decl) = looping;
+ }
}
/* See if the frequency of NODE can be updated based on frequencies of its
cgraph_propagate_frequency (struct cgraph_node *node)
{
bool maybe_unlikely_executed = true, maybe_executed_once = true;
+ bool only_called_at_startup = true;
+ bool only_called_at_exit = true;
+ bool changed = false;
struct cgraph_edge *edge;
+
if (!node->local.local)
return false;
gcc_assert (node->analyzed);
- if (node->frequency == NODE_FREQUENCY_HOT)
- return false;
- if (node->frequency == NODE_FREQUENCY_UNLIKELY_EXECUTED)
- return false;
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Processing frequency %s\n", cgraph_node_name (node));
+
for (edge = node->callers;
- edge && (maybe_unlikely_executed || maybe_executed_once);
+ edge && (maybe_unlikely_executed || maybe_executed_once
+ || only_called_at_startup || only_called_at_exit);
edge = edge->next_caller)
{
+ if (edge->caller != node)
+ {
+ only_called_at_startup &= edge->caller->only_called_at_startup;
+ /* It makes snese to put main() together with the static constructors.
+ It will be executed for sure, but rest of functions called from
+ main are definitly not at startup only. */
+ if (MAIN_NAME_P (DECL_NAME (edge->caller->decl)))
+ only_called_at_startup = 0;
+ only_called_at_exit &= edge->caller->only_called_at_exit;
+ }
if (!edge->frequency)
continue;
switch (edge->caller->frequency)
break;
case NODE_FREQUENCY_EXECUTED_ONCE:
if (dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, " Called by %s that is executed once\n", cgraph_node_name (node));
+ fprintf (dump_file, " Called by %s that is executed once\n",
+ cgraph_node_name (node));
maybe_unlikely_executed = false;
if (edge->loop_nest)
{
case NODE_FREQUENCY_HOT:
case NODE_FREQUENCY_NORMAL:
if (dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, " Called by %s that is normal or hot\n", cgraph_node_name (node));
+ fprintf (dump_file, " Called by %s that is normal or hot\n",
+ cgraph_node_name (node));
maybe_unlikely_executed = false;
maybe_executed_once = false;
break;
}
}
- if (maybe_unlikely_executed)
- {
- node->frequency = NODE_FREQUENCY_UNLIKELY_EXECUTED;
+ if ((only_called_at_startup && !only_called_at_exit)
+ && !node->only_called_at_startup)
+ {
+ node->only_called_at_startup = true;
if (dump_file)
- fprintf (dump_file, "Node %s promoted to unlikely executed.\n", cgraph_node_name (node));
- return true;
- }
- if (maybe_executed_once && node->frequency != NODE_FREQUENCY_EXECUTED_ONCE)
- {
- node->frequency = NODE_FREQUENCY_EXECUTED_ONCE;
+ fprintf (dump_file, "Node %s promoted to only called at startup.\n",
+ cgraph_node_name (node));
+ changed = true;
+ }
+ if ((only_called_at_exit && !only_called_at_startup)
+ && !node->only_called_at_exit)
+ {
+ node->only_called_at_exit = true;
if (dump_file)
- fprintf (dump_file, "Node %s promoted to executed once.\n", cgraph_node_name (node));
- return true;
- }
- return false;
+ fprintf (dump_file, "Node %s promoted to only called at exit.\n",
+ cgraph_node_name (node));
+ changed = true;
+ }
+ /* These come either from profile or user hints; never update them. */
+ if (node->frequency == NODE_FREQUENCY_HOT
+ || node->frequency == NODE_FREQUENCY_UNLIKELY_EXECUTED)
+ return changed;
+ if (maybe_unlikely_executed)
+ {
+ node->frequency = NODE_FREQUENCY_UNLIKELY_EXECUTED;
+ if (dump_file)
+ fprintf (dump_file, "Node %s promoted to unlikely executed.\n",
+ cgraph_node_name (node));
+ changed = true;
+ }
+ else if (maybe_executed_once && node->frequency != NODE_FREQUENCY_EXECUTED_ONCE)
+ {
+ node->frequency = NODE_FREQUENCY_EXECUTED_ONCE;
+ if (dump_file)
+ fprintf (dump_file, "Node %s promoted to executed once.\n",
+ cgraph_node_name (node));
+ changed = true;
+ }
+ return changed;
+}
+
+/* Return true when NODE can not return or throw and thus
+ it is safe to ignore its side effects for IPA analysis. */
+
+bool
+cgraph_node_cannot_return (struct cgraph_node *node)
+{
+ int flags = flags_from_decl_or_type (node->decl);
+ if (!flag_exceptions)
+ return (flags & ECF_NORETURN) != 0;
+ else
+ return ((flags & (ECF_NORETURN | ECF_NOTHROW))
+ == (ECF_NORETURN | ECF_NOTHROW));
+}
+
+/* Return true when call of E can not lead to return from caller
+ and thus it is safe to ignore its side effects for IPA analysis
+ when computing side effects of the caller.
+ FIXME: We could actually mark all edges that have no reaching
+ patch to EXIT_BLOCK_PTR or throw to get better results. */
+bool
+cgraph_edge_cannot_lead_to_return (struct cgraph_edge *e)
+{
+ if (cgraph_node_cannot_return (e->caller))
+ return true;
+ if (e->indirect_unknown_callee)
+ {
+ int flags = e->indirect_info->ecf_flags;
+ if (!flag_exceptions)
+ return (flags & ECF_NORETURN) != 0;
+ else
+ return ((flags & (ECF_NORETURN | ECF_NOTHROW))
+ == (ECF_NORETURN | ECF_NOTHROW));
+ }
+ else
+ return cgraph_node_cannot_return (e->callee);
+}
+
+/* Return true when function NODE can be removed from callgraph
+ if all direct calls are eliminated. */
+
+bool
+cgraph_can_remove_if_no_direct_calls_and_refs_p (struct cgraph_node *node)
+{
+ gcc_assert (!node->global.inlined_to);
+ /* Extern inlines can always go, we will use the external definition. */
+ if (DECL_EXTERNAL (node->decl))
+ return true;
+ /* When function is needed, we can not remove it. */
+ if (node->needed || node->reachable_from_other_partition)
+ return false;
+ if (DECL_STATIC_CONSTRUCTOR (node->decl)
+ || DECL_STATIC_DESTRUCTOR (node->decl))
+ return false;
+ /* Only COMDAT functions can be removed if externally visible. */
+ if (node->local.externally_visible
+ && (!DECL_COMDAT (node->decl)
+ || cgraph_used_from_object_file_p (node)))
+ return false;
+ return true;
+}
+
+/* Return true when function NODE can be excpected to be removed
+ from program when direct calls in this compilation unit are removed.
+
+ As a special case COMDAT functions are
+ cgraph_can_remove_if_no_direct_calls_p while the are not
+ cgraph_only_called_directly_p (it is possible they are called from other
+ unit)
+
+ This function behaves as cgraph_only_called_directly_p because eliminating
+ all uses of COMDAT function does not make it neccesarily disappear from
+ the program unless we are compiling whole program or we do LTO. In this
+ case we know we win since dynamic linking will not really discard the
+ linkonce section. */
+
+bool
+cgraph_will_be_removed_from_program_if_no_direct_calls (struct cgraph_node *node)
+{
+ gcc_assert (!node->global.inlined_to);
+ if (cgraph_used_from_object_file_p (node))
+ return false;
+ if (!in_lto_p && !flag_whole_program)
+ return cgraph_only_called_directly_p (node);
+ else
+ {
+ if (DECL_EXTERNAL (node->decl))
+ return true;
+ return cgraph_can_remove_if_no_direct_calls_p (node);
+ }
+}
+
+/* Return true when RESOLUTION indicate that linker will use
+ the symbol from non-LTo object files. */
+
+bool
+resolution_used_from_other_file_p (enum ld_plugin_symbol_resolution resolution)
+{
+ return (resolution == LDPR_PREVAILING_DEF
+ || resolution == LDPR_PREEMPTED_REG
+ || resolution == LDPR_RESOLVED_EXEC
+ || resolution == LDPR_RESOLVED_DYN);
+}
+
+/* Return true when NODE is known to be used from other (non-LTO) object file.
+ Known only when doing LTO via linker plugin. */
+
+bool
+cgraph_used_from_object_file_p (struct cgraph_node *node)
+{
+ struct cgraph_node *alias;
+
+ gcc_assert (!node->global.inlined_to);
+ if (!TREE_PUBLIC (node->decl) || DECL_EXTERNAL (node->decl))
+ return false;
+ if (resolution_used_from_other_file_p (node->resolution))
+ return true;
+ for (alias = node->same_body; alias; alias = alias->next)
+ if (TREE_PUBLIC (alias->decl)
+ && resolution_used_from_other_file_p (alias->resolution))
+ return true;
+ return false;
}
#include "gt-cgraph.h"
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