symtab_node *
symtab_nonoverwritable_alias (symtab_node *node)
{
tree new_decl;
symtab_node *new_node = NULL;
/* First try to look up existing alias or base object
(if that is already non-overwritable). */
node = symtab_alias_ultimate_target (node, NULL);
gcc_assert (!node->alias && !node->weakref);
symtab_for_node_and_aliases (node, symtab_nonoverwritable_alias_1,
(void *)&new_node, true);
if (new_node)
return new_node;
#ifndef ASM_OUTPUT_DEF
/* If aliases aren't supported by the assembler, fail. */
return NULL;
#endif
/* Otherwise create a new one. */
new_decl = copy_node (node->decl);
DECL_DLLIMPORT_P (new_decl) = 0;
DECL_NAME (new_decl) = clone_function_name (node->decl, "localalias");
if (TREE_CODE (new_decl) == FUNCTION_DECL)
DECL_STRUCT_FUNCTION (new_decl) = NULL;
DECL_INITIAL (new_decl) = NULL;
SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl));
SET_DECL_RTL (new_decl, NULL);
/* Update the properties. */
DECL_EXTERNAL (new_decl) = 0;
if (DECL_ONE_ONLY (node->decl))
DECL_SECTION_NAME (new_decl) = NULL;
DECL_COMDAT_GROUP (new_decl) = 0;
TREE_PUBLIC (new_decl) = 0;
DECL_COMDAT (new_decl) = 0;
DECL_WEAK (new_decl) = 0;
DECL_VIRTUAL_P (new_decl) = 0;
if (TREE_CODE (new_decl) == FUNCTION_DECL)
{
DECL_STATIC_CONSTRUCTOR (new_decl) = 0;
DECL_STATIC_DESTRUCTOR (new_decl) = 0;
new_node = cgraph_create_function_alias
(new_decl, node->decl);
}
else
new_node = varpool_create_variable_alias (new_decl,
node->decl);
symtab_resolve_alias (new_node, node);
gcc_assert (decl_binds_to_current_def_p (new_decl));
return new_node;
}
void
lto_symtab_merge_symbols (void)
{
symtab_node node;
if (!flag_ltrans)
{
symtab_initialize_asm_name_hash ();
/* Do the actual merging.
At this point we invalidate hash translating decls into symtab nodes
because after removing one of duplicate decls the hash is not correcly
updated to the ohter dupliate. */
FOR_EACH_SYMBOL (node)
if (lto_symtab_symbol_p (node)
&& node->symbol.next_sharing_asm_name
&& !node->symbol.previous_sharing_asm_name)
lto_symtab_merge_symbols_1 (node);
/* Resolve weakref aliases whose target are now in the compilation unit.
also re-populate the hash translating decls into symtab nodes*/
FOR_EACH_SYMBOL (node)
{
cgraph_node *cnode, *cnode2;
if (!node->symbol.analyzed && node->symbol.alias_target)
{
symtab_node tgt = symtab_node_for_asm (node->symbol.alias_target);
gcc_assert (node->symbol.weakref);
if (tgt)
symtab_resolve_alias (node, tgt);
}
node->symbol.aux = NULL;
if (!(cnode = dyn_cast <cgraph_node> (node))
|| !cnode->clone_of
|| cnode->clone_of->symbol.decl != cnode->symbol.decl)
{
if (cnode && DECL_BUILT_IN (node->symbol.decl)
&& (cnode2 = cgraph_get_node (node->symbol.decl))
&& cnode2 != cnode)
lto_cgraph_replace_node (cnode2, cnode);
symtab_insert_node_to_hashtable ((symtab_node)node);
}
}
}
varpool_node *
varpool_extra_name_alias (tree alias, tree decl)
{
varpool_node *alias_node;
#ifndef ASM_OUTPUT_DEF
/* If aliases aren't supported by the assembler, fail. */
return NULL;
#endif
alias_node = varpool_create_variable_alias (alias, decl);
alias_node->cpp_implicit_alias = true;
/* Extra name alias mechanizm creates aliases really late
via DECL_ASSEMBLER_NAME mechanizm.
This is unfortunate because they are not going through the
standard channels. Ensure they get output. */
if (cpp_implicit_aliases_done)
symtab_resolve_alias (alias_node,
varpool_node_for_decl (decl));
return alias_node;
}
void
varpool_analyze_node (varpool_node *node)
{
tree decl = node->decl;
/* When reading back varpool at LTO time, we re-construct the queue in order
to have "needed" list right by inserting all needed nodes into varpool.
We however don't want to re-analyze already analyzed nodes. */
if (!node->analyzed)
{
gcc_assert (!in_lto_p || cgraph_function_flags_ready);
/* Compute the alignment early so function body expanders are
already informed about increased alignment. */
align_variable (decl, 0);
}
if (node->alias)
symtab_resolve_alias
(node, varpool_get_node (node->alias_target));
else if (DECL_INITIAL (decl))
record_references_in_initializer (decl, node->analyzed);
node->analyzed = true;
}
symtab_node
symtab_nonoverwritable_alias (symtab_node node)
{
tree new_decl;
symtab_node new_node = NULL;
symtab_for_node_and_aliases (node, symtab_nonoverwritable_alias_1,
(void *)&new_node, true);
if (new_node)
return new_node;
new_decl = copy_node (node->symbol.decl);
DECL_NAME (new_decl) = clone_function_name (node->symbol.decl, "localalias");
if (TREE_CODE (new_decl) == FUNCTION_DECL)
DECL_STRUCT_FUNCTION (new_decl) = NULL;
DECL_INITIAL (new_decl) = NULL;
SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl));
SET_DECL_RTL (new_decl, NULL);
/* Update the properties. */
DECL_EXTERNAL (new_decl) = 0;
if (DECL_ONE_ONLY (node->symbol.decl))
DECL_SECTION_NAME (new_decl) = NULL;
DECL_COMDAT_GROUP (new_decl) = 0;
TREE_PUBLIC (new_decl) = 0;
DECL_COMDAT (new_decl) = 0;
DECL_WEAK (new_decl) = 0;
DECL_VIRTUAL_P (new_decl) = 0;
if (TREE_CODE (new_decl) == FUNCTION_DECL)
{
DECL_STATIC_CONSTRUCTOR (new_decl) = 0;
DECL_STATIC_DESTRUCTOR (new_decl) = 0;
new_node = (symtab_node) cgraph_create_function_alias (new_decl, node->symbol.decl);
}
else
new_node = (symtab_node) varpool_create_variable_alias (new_decl, node->symbol.decl);
symtab_resolve_alias (new_node, node);
return new_node;
}
