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/* Perform optimizations on tree structure.
Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2009
Free Software Foundation, Inc.
Written by Mark Michell (mark@codesourcery.com).
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "cp-tree.h"
#include "rtl.h"
#include "insn-config.h"
#include "input.h"
#include "integrate.h"
#include "toplev.h"
#include "varray.h"
#include "params.h"
#include "hashtab.h"
#include "target.h"
#include "debug.h"
#include "tree-inline.h"
#include "flags.h"
#include "langhooks.h"
#include "diagnostic.h"
#include "tree-dump.h"
#include "gimple.h"
/* Prototypes. */
static void update_cloned_parm (tree, tree, bool);
/* CLONED_PARM is a copy of CLONE, generated for a cloned constructor
or destructor. Update it to ensure that the source-position for
the cloned parameter matches that for the original, and that the
debugging generation code will be able to find the original PARM. */
static void
update_cloned_parm (tree parm, tree cloned_parm, bool first)
{
DECL_ABSTRACT_ORIGIN (cloned_parm) = parm;
/* We may have taken its address. */
TREE_ADDRESSABLE (cloned_parm) = TREE_ADDRESSABLE (parm);
/* The definition might have different constness. */
TREE_READONLY (cloned_parm) = TREE_READONLY (parm);
TREE_USED (cloned_parm) = !first || TREE_USED (parm);
/* The name may have changed from the declaration. */
DECL_NAME (cloned_parm) = DECL_NAME (parm);
DECL_SOURCE_LOCATION (cloned_parm) = DECL_SOURCE_LOCATION (parm);
TREE_TYPE (cloned_parm) = TREE_TYPE (parm);
DECL_GIMPLE_REG_P (cloned_parm) = DECL_GIMPLE_REG_P (parm);
}
/* FN is a function in High GIMPLE form that has a complete body and no
CFG. CLONE is a function whose body is to be set to a copy of FN,
mapping argument declarations according to the ARG_MAP splay_tree. */
static void
clone_body (tree clone, tree fn, void *arg_map)
{
copy_body_data id;
gimple_seq new_body;
/* FN must already be in GIMPLE form. */
gcc_assert (gimple_body (fn));
/* Clone the body, as if we were making an inline call. But, remap
the parameters in the callee to the parameters of caller. */
memset (&id, 0, sizeof (id));
id.src_fn = fn;
id.dst_fn = clone;
id.src_cfun = DECL_STRUCT_FUNCTION (fn);
id.decl_map = (struct pointer_map_t *) arg_map;
id.copy_decl = copy_decl_no_change;
id.transform_call_graph_edges = CB_CGE_DUPLICATE;
id.transform_new_cfg = true;
id.transform_return_to_modify = false;
id.transform_lang_insert_block = NULL;
/* We're not inside any EH region. */
id.eh_region = -1;
/* Actually copy the body. */
new_body = remap_gimple_seq (gimple_body (fn), &id);
gimple_set_body (clone, new_body);
}
/* DELETE_DTOR is a delete destructor whose body will be built.
COMPLETE_DTOR is the corresponding complete destructor. */
static void
build_delete_destructor_body (tree delete_dtor, tree complete_dtor)
{
tree call_dtor, call_delete;
tree parm = DECL_ARGUMENTS (delete_dtor);
tree virtual_size = cxx_sizeof (current_class_type);
DECL_SAVED_TREE (delete_dtor) = push_stmt_list ();
/* Call the corresponding complete destructor. */
gcc_assert (complete_dtor);
call_dtor = build_cxx_call (complete_dtor, 1, &parm);
add_stmt (call_dtor);
add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
/* Call the delete function. */
call_delete = build_op_delete_call (DELETE_EXPR, current_class_ptr,
virtual_size,
/*global_p=*/false,
/*placement=*/NULL_TREE,
/*alloc_fn=*/NULL_TREE);
add_stmt (call_delete);
/* Return the address of the object. */
if (targetm.cxx.cdtor_returns_this ())
{
tree val = DECL_ARGUMENTS (delete_dtor);
val = build2 (MODIFY_EXPR, TREE_TYPE (val),
DECL_RESULT (delete_dtor), val);
add_stmt (build_stmt (RETURN_EXPR, val));
}
}
/* FN is a function that has a complete body. Clone the body as
necessary. Returns nonzero if there's no longer any need to
process the main body. */
bool
maybe_clone_body (tree fn)
{
tree clone;
tree complete_dtor = NULL_TREE;
bool first = true;
/* We only clone constructors and destructors. */
if (!DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)
&& !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn))
return 0;
/* Emit the DWARF1 abstract instance. */
(*debug_hooks->deferred_inline_function) (fn);
/* Look for the complete destructor which may be used to build the
delete destructor. */
FOR_EACH_CLONE (clone, fn)
if (DECL_NAME (clone) == complete_dtor_identifier)
{
complete_dtor = clone;
break;
}
/* We know that any clones immediately follow FN in the TYPE_METHODS
list. */
push_to_top_level ();
FOR_EACH_CLONE (clone, fn)
{
tree parm;
tree clone_parm;
int parmno;
struct pointer_map_t *decl_map;
/* Update CLONE's source position information to match FN's. */
DECL_SOURCE_LOCATION (clone) = DECL_SOURCE_LOCATION (fn);
DECL_DECLARED_INLINE_P (clone) = DECL_DECLARED_INLINE_P (fn);
DECL_COMDAT (clone) = DECL_COMDAT (fn);
DECL_WEAK (clone) = DECL_WEAK (fn);
DECL_ONE_ONLY (clone) = DECL_ONE_ONLY (fn);
DECL_SECTION_NAME (clone) = DECL_SECTION_NAME (fn);
DECL_USE_TEMPLATE (clone) = DECL_USE_TEMPLATE (fn);
DECL_EXTERNAL (clone) = DECL_EXTERNAL (fn);
DECL_INTERFACE_KNOWN (clone) = DECL_INTERFACE_KNOWN (fn);
DECL_NOT_REALLY_EXTERN (clone) = DECL_NOT_REALLY_EXTERN (fn);
TREE_PUBLIC (clone) = TREE_PUBLIC (fn);
DECL_VISIBILITY (clone) = DECL_VISIBILITY (fn);
DECL_VISIBILITY_SPECIFIED (clone) = DECL_VISIBILITY_SPECIFIED (fn);
DECL_DLLIMPORT_P (clone) = DECL_DLLIMPORT_P (fn);
/* Adjust the parameter names and locations. */
parm = DECL_ARGUMENTS (fn);
clone_parm = DECL_ARGUMENTS (clone);
/* Update the `this' parameter, which is always first. */
update_cloned_parm (parm, clone_parm, first);
parm = TREE_CHAIN (parm);
clone_parm = TREE_CHAIN (clone_parm);
if (DECL_HAS_IN_CHARGE_PARM_P (fn))
parm = TREE_CHAIN (parm);
if (DECL_HAS_VTT_PARM_P (fn))
parm = TREE_CHAIN (parm);
if (DECL_HAS_VTT_PARM_P (clone))
clone_parm = TREE_CHAIN (clone_parm);
for (; parm;
parm = TREE_CHAIN (parm), clone_parm = TREE_CHAIN (clone_parm))
/* Update this parameter. */
update_cloned_parm (parm, clone_parm, first);
/* Start processing the function. */
start_preparsed_function (clone, NULL_TREE, SF_PRE_PARSED);
/* Build the delete destructor by calling complete destructor
and delete function. */
if (DECL_NAME (clone) == deleting_dtor_identifier)
build_delete_destructor_body (clone, complete_dtor);
else
{
/* Remap the parameters. */
decl_map = pointer_map_create ();
for (parmno = 0,
parm = DECL_ARGUMENTS (fn),
clone_parm = DECL_ARGUMENTS (clone);
parm;
++parmno,
parm = TREE_CHAIN (parm))
{
/* Map the in-charge parameter to an appropriate constant. */
if (DECL_HAS_IN_CHARGE_PARM_P (fn) && parmno == 1)
{
tree in_charge;
in_charge = in_charge_arg_for_name (DECL_NAME (clone));
*pointer_map_insert (decl_map, parm) = in_charge;
}
else if (DECL_ARTIFICIAL (parm)
&& DECL_NAME (parm) == vtt_parm_identifier)
{
/* For a subobject constructor or destructor, the next
argument is the VTT parameter. Remap the VTT_PARM
from the CLONE to this parameter. */
if (DECL_HAS_VTT_PARM_P (clone))
{
DECL_ABSTRACT_ORIGIN (clone_parm) = parm;
*pointer_map_insert (decl_map, parm) = clone_parm;
clone_parm = TREE_CHAIN (clone_parm);
}
/* Otherwise, map the VTT parameter to `NULL'. */
else
*pointer_map_insert (decl_map, parm) = null_pointer_node;
}
/* Map other parameters to their equivalents in the cloned
function. */
else
{
*pointer_map_insert (decl_map, parm) = clone_parm;
clone_parm = TREE_CHAIN (clone_parm);
}
}
if (targetm.cxx.cdtor_returns_this ())
{
parm = DECL_RESULT (fn);
clone_parm = DECL_RESULT (clone);
*pointer_map_insert (decl_map, parm) = clone_parm;
}
/* Clone the body. */
clone_body (clone, fn, decl_map);
/* Clean up. */
pointer_map_destroy (decl_map);
}
/* The clone can throw iff the original function can throw. */
cp_function_chain->can_throw = !TREE_NOTHROW (fn);
/* Now, expand this function into RTL, if appropriate. */
finish_function (0);
BLOCK_ABSTRACT_ORIGIN (DECL_INITIAL (clone)) = DECL_INITIAL (fn);
/* Gimplify the new built deleting destructor. Gcc 4.5 doesn't need
this since the gimplification occurs in a later pass. */
if (DECL_NAME (clone) == deleting_dtor_identifier)
gimplify_function_tree (clone);
DECL_SAVED_TREE (clone) = NULL;
expand_or_defer_fn (clone);
first = false;
}
pop_from_top_level ();
/* We don't need to process the original function any further. */
return 1;
}
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