void
change_decl_assembler_name (tree decl, tree name)
{
symtab_node node = NULL;
/* We can have user ASM names on things, like global register variables, that
are not in the symbol table. */
if ((TREE_CODE (decl) == VAR_DECL
&& (TREE_STATIC (decl) || DECL_EXTERNAL (decl)))
|| TREE_CODE (decl) == FUNCTION_DECL)
node = symtab_get_node (decl);
if (!DECL_ASSEMBLER_NAME_SET_P (decl))
{
SET_DECL_ASSEMBLER_NAME (decl, name);
if (node)
insert_to_assembler_name_hash (node);
}
else
{
if (name == DECL_ASSEMBLER_NAME (decl))
return;
if (node)
unlink_from_assembler_name_hash (node);
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);
if (node)
insert_to_assembler_name_hash (node);
}
}
tree
make_alias_for (tree function, tree newid)
{
tree alias = build_decl (FUNCTION_DECL, newid, TREE_TYPE (function));
DECL_LANG_SPECIFIC (alias) = DECL_LANG_SPECIFIC (function);
cxx_dup_lang_specific_decl (alias);
DECL_CONTEXT (alias) = NULL;
TREE_READONLY (alias) = TREE_READONLY (function);
TREE_THIS_VOLATILE (alias) = TREE_THIS_VOLATILE (function);
TREE_PUBLIC (alias) = 0;
DECL_INTERFACE_KNOWN (alias) = 1;
DECL_NOT_REALLY_EXTERN (alias) = 1;
DECL_THIS_STATIC (alias) = 1;
DECL_SAVED_FUNCTION_DATA (alias) = NULL;
DECL_DESTRUCTOR_P (alias) = 0;
DECL_CONSTRUCTOR_P (alias) = 0;
DECL_CLONED_FUNCTION (alias) = NULL_TREE;
DECL_EXTERNAL (alias) = 0;
DECL_ARTIFICIAL (alias) = 1;
DECL_NO_STATIC_CHAIN (alias) = 1;
DECL_PENDING_INLINE_P (alias) = 0;
DECL_INLINE (alias) = 0;
DECL_DECLARED_INLINE_P (alias) = 0;
DECL_DEFERRED_FN (alias) = 0;
DECL_USE_TEMPLATE (alias) = 0;
DECL_TEMPLATE_INSTANTIATED (alias) = 0;
DECL_TEMPLATE_INFO (alias) = NULL;
DECL_INITIAL (alias) = error_mark_node;
TREE_ADDRESSABLE (alias) = 1;
TREE_USED (alias) = 1;
SET_DECL_ASSEMBLER_NAME (alias, DECL_NAME (alias));
TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias)) = 1;
return alias;
}
static bool
decide_is_function_needed (struct cgraph_node *node, tree decl)
{
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 (node->local.externally_visible)
return true;
/* ??? If the assembler name is set by hand, it is possible to assemble
the name later after finalizing the function and the fact is noticed
in assemble_name then. This is arguably a bug. */
if (DECL_ASSEMBLER_NAME_SET_P (decl)
&& TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
return true;
/* With -fkeep-inline-functions we are keeping all inline functions except
for extern inline ones. */
if (flag_keep_inline_functions
&& DECL_DECLARED_INLINE_P (decl)
&& !DECL_EXTERNAL (decl)
&& !lookup_attribute ("always_inline", DECL_ATTRIBUTES (decl)))
return true;
/* If we decided it was needed before, but at the time we didn't have
the body of the function available, then it's still needed. We have
to go back and re-check its dependencies now. */
if (node->needed)
return true;
/* Externally visible functions must be output. The exception is
COMDAT functions that must be output only when they are needed.
When not optimizing, also output the static functions. (see
PR24561), but don't do so for always_inline functions, functions
declared inline and nested functions. These was optimized out
in the original implementation and it is unclear whether we want
to change the behavior here. */
if (((TREE_PUBLIC (decl)
|| (!optimize && !node->local.disregard_inline_limits
&& !DECL_DECLARED_INLINE_P (decl)
&& !node->origin))
&& !flag_whole_program)
&& !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl))
return true;
/* Constructors and destructors are reachable from the runtime by
some mechanism. */
if (DECL_STATIC_CONSTRUCTOR (decl) || DECL_STATIC_DESTRUCTOR (decl))
return true;
return false;
}
static tree
make_alias_for_thunk (tree function)
{
tree alias;
char buf[256];
#if defined (TARGET_IS_PE_COFF)
if (DECL_ONE_ONLY (function))
return function;
#endif
ASM_GENERATE_INTERNAL_LABEL (buf, "LTHUNK", thunk_labelno);
thunk_labelno++;
alias = build_decl (FUNCTION_DECL, get_identifier (buf),
TREE_TYPE (function));
DECL_LANG_SPECIFIC (alias) = DECL_LANG_SPECIFIC (function);
cxx_dup_lang_specific_decl (alias);
DECL_CONTEXT (alias) = NULL;
TREE_READONLY (alias) = TREE_READONLY (function);
TREE_THIS_VOLATILE (alias) = TREE_THIS_VOLATILE (function);
TREE_PUBLIC (alias) = 0;
DECL_INTERFACE_KNOWN (alias) = 1;
DECL_NOT_REALLY_EXTERN (alias) = 1;
DECL_THIS_STATIC (alias) = 1;
DECL_SAVED_FUNCTION_DATA (alias) = NULL;
DECL_DESTRUCTOR_P (alias) = 0;
DECL_CONSTRUCTOR_P (alias) = 0;
DECL_CLONED_FUNCTION (alias) = NULL_TREE;
DECL_EXTERNAL (alias) = 0;
DECL_ARTIFICIAL (alias) = 1;
DECL_NO_STATIC_CHAIN (alias) = 1;
DECL_PENDING_INLINE_P (alias) = 0;
DECL_INLINE (alias) = 0;
DECL_DECLARED_INLINE_P (alias) = 0;
DECL_DEFERRED_FN (alias) = 0;
DECL_USE_TEMPLATE (alias) = 0;
DECL_TEMPLATE_INSTANTIATED (alias) = 0;
DECL_TEMPLATE_INFO (alias) = NULL;
DECL_INITIAL (alias) = error_mark_node;
TREE_ADDRESSABLE (alias) = 1;
TREE_USED (alias) = 1;
SET_DECL_ASSEMBLER_NAME (alias, DECL_NAME (alias));
TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias)) = 1;
if (!flag_syntax_only)
assemble_alias (alias, DECL_ASSEMBLER_NAME (function));
return alias;
}
/* Determine if variable DECL is needed. That is, visible to something
either outside this translation unit, something magic in the system
configury */
bool
decide_is_variable_needed (struct varpool_node *node, tree decl)
{
/* If the user told us it is used, then it must be so. */
if ((node->externally_visible && !DECL_COMDAT (decl))
|| node->force_output)
return true;
/* ??? If the assembler name is set by hand, it is possible to assemble
the name later after finalizing the function and the fact is noticed
in assemble_name then. This is arguably a bug. */
if (DECL_ASSEMBLER_NAME_SET_P (decl)
&& TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
return true;
/* Externally visible variables must be output. The exception is
COMDAT variables that must be output only when they are needed. */
if (TREE_PUBLIC (decl)
&& !flag_whole_program
&& !flag_lto
&& !flag_whopr
&& !DECL_COMDAT (decl)
&& !DECL_EXTERNAL (decl))
return true;
/* When emulating tls, we actually see references to the control
variable, rather than the user-level variable. */
if (!targetm.have_tls
&& TREE_CODE (decl) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl))
{
tree control = emutls_decl (decl);
if (decide_is_variable_needed (varpool_node (control), control))
return true;
}
/* When not reordering top level variables, we have to assume that
we are going to keep everything. */
if (flag_toplevel_reorder)
return false;
/* We want to emit COMDAT variables only when absolutely necessary. */
if (DECL_COMDAT (decl))
return false;
return true;
}
void
symbol_table::change_decl_assembler_name (tree decl, tree name)
{
symtab_node *node = NULL;
/* We can have user ASM names on things, like global register variables, that
are not in the symbol table. */
if ((TREE_CODE (decl) == VAR_DECL
&& (TREE_STATIC (decl) || DECL_EXTERNAL (decl)))
|| TREE_CODE (decl) == FUNCTION_DECL)
node = symtab_node::get (decl);
if (!DECL_ASSEMBLER_NAME_SET_P (decl))
{
SET_DECL_ASSEMBLER_NAME (decl, name);
if (node)
insert_to_assembler_name_hash (node, true);
}
else
{
if (name == DECL_ASSEMBLER_NAME (decl))
return;
tree alias = (IDENTIFIER_TRANSPARENT_ALIAS (DECL_ASSEMBLER_NAME (decl))
? TREE_CHAIN (DECL_ASSEMBLER_NAME (decl))
: NULL);
if (node)
unlink_from_assembler_name_hash (node, true);
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);
if (alias)
{
IDENTIFIER_TRANSPARENT_ALIAS (name) = 1;
TREE_CHAIN (name) = alias;
}
if (node)
insert_to_assembler_name_hash (node, true);
}
}
tree
make_alias_for (tree target, tree newid)
{
tree alias = build_decl (DECL_SOURCE_LOCATION (target),
TREE_CODE (target), newid, TREE_TYPE (target));
DECL_LANG_SPECIFIC (alias) = DECL_LANG_SPECIFIC (target);
cxx_dup_lang_specific_decl (alias);
DECL_CONTEXT (alias) = NULL;
TREE_READONLY (alias) = TREE_READONLY (target);
TREE_THIS_VOLATILE (alias) = TREE_THIS_VOLATILE (target);
TREE_PUBLIC (alias) = 0;
DECL_INTERFACE_KNOWN (alias) = 1;
if (DECL_LANG_SPECIFIC (alias))
{
DECL_NOT_REALLY_EXTERN (alias) = 1;
DECL_USE_TEMPLATE (alias) = 0;
DECL_TEMPLATE_INFO (alias) = NULL;
}
DECL_EXTERNAL (alias) = 0;
DECL_ARTIFICIAL (alias) = 1;
DECL_TEMPLATE_INSTANTIATED (alias) = 0;
if (TREE_CODE (alias) == FUNCTION_DECL)
{
DECL_SAVED_FUNCTION_DATA (alias) = NULL;
DECL_DESTRUCTOR_P (alias) = 0;
DECL_CONSTRUCTOR_P (alias) = 0;
DECL_PENDING_INLINE_P (alias) = 0;
DECL_DECLARED_INLINE_P (alias) = 0;
DECL_INITIAL (alias) = error_mark_node;
DECL_ARGUMENTS (alias) = copy_list (DECL_ARGUMENTS (target));
}
else
TREE_STATIC (alias) = 1;
TREE_ADDRESSABLE (alias) = 1;
TREE_USED (alias) = 1;
SET_DECL_ASSEMBLER_NAME (alias, DECL_NAME (alias));
TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias)) = 1;
return alias;
}