/* Perform optimizations on tree structure.
- Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2007
- Free Software Foundation, Inc.
+ Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2009,
+ 2010 Free Software Foundation, Inc.
Written by Mark Michell (mark@codesourcery.com).
This file is part of GCC.
#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 "tree-inline.h"
#include "flags.h"
#include "langhooks.h"
-#include "diagnostic.h"
+#include "diagnostic-core.h"
#include "tree-dump.h"
-#include "tree-gimple.h"
+#include "gimple.h"
+#include "tree-iterator.h"
+#include "cgraph.h"
/* Prototypes. */
DECL_GIMPLE_REG_P (cloned_parm) = DECL_GIMPLE_REG_P (parm);
}
-/* FN is a function that has a complete body, and 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. */
+
+/* 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;
+ tree stmts;
- /* Clone the body, as if we were making an inline call. But, remap the
- parameters in the callee to the parameters of caller. */
+ /* 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.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 = insert_block;
+ id.transform_lang_insert_block = NULL;
/* We're not inside any EH region. */
- id.eh_region = -1;
+ id.eh_lp_nr = 0;
+
+ stmts = DECL_SAVED_TREE (fn);
+ walk_tree (&stmts, copy_tree_body_r, &id, NULL);
+
+ /* Also remap the initializer of any static variables so that they (in
+ particular, any label addresses) correspond to the base variant rather
+ than the abstract one. */
+ if (DECL_NAME (clone) == base_dtor_identifier
+ || DECL_NAME (clone) == base_ctor_identifier)
+ {
+ unsigned ix;
+ tree decl;
+
+ FOR_EACH_LOCAL_DECL (DECL_STRUCT_FUNCTION (fn), ix, decl)
+ walk_tree (&DECL_INITIAL (decl), copy_tree_body_r, &id, NULL);
+ }
+
+ append_to_statement_list_force (stmts, &DECL_SAVED_TREE (clone));
+}
+
+/* DELETE_DTOR is a delete destructor whose body will be built.
+ COMPLETE_DTOR is the corresponding complete destructor. */
- /* Actually copy the body. */
- append_to_statement_list_force (copy_generic_body (&id),
- &DECL_SAVED_TREE (clone));
+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);
+
+ /* 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 (0, 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 (0, RETURN_EXPR, val));
+ }
+}
+
+/* Return name of comdat group for complete and base ctor (or dtor)
+ that have the same body. If dtor is virtual, deleting dtor goes
+ into this comdat group as well. */
+
+static tree
+cdtor_comdat_group (tree complete, tree base)
+{
+ tree complete_name = DECL_COMDAT_GROUP (complete);
+ tree base_name = DECL_COMDAT_GROUP (base);
+ char *grp_name;
+ const char *p, *q;
+ bool diff_seen = false;
+ size_t idx;
+ if (complete_name == NULL)
+ complete_name = cxx_comdat_group (complete);
+ if (base_name == NULL)
+ base_name = cxx_comdat_group (base);
+ gcc_assert (IDENTIFIER_LENGTH (complete_name)
+ == IDENTIFIER_LENGTH (base_name));
+ grp_name = XALLOCAVEC (char, IDENTIFIER_LENGTH (complete_name) + 1);
+ p = IDENTIFIER_POINTER (complete_name);
+ q = IDENTIFIER_POINTER (base_name);
+ for (idx = 0; idx < IDENTIFIER_LENGTH (complete_name); idx++)
+ if (p[idx] == q[idx])
+ grp_name[idx] = p[idx];
+ else
+ {
+ gcc_assert (!diff_seen
+ && idx > 0
+ && (p[idx - 1] == 'C' || p[idx - 1] == 'D')
+ && p[idx] == '1'
+ && q[idx] == '2');
+ grp_name[idx] = '5';
+ diff_seen = true;
+ }
+ grp_name[idx] = '\0';
+ gcc_assert (diff_seen);
+ return get_identifier (grp_name);
}
/* FN is a function that has a complete body. Clone the body as
bool
maybe_clone_body (tree fn)
{
+ tree comdat_group = NULL_TREE;
tree clone;
+ tree fns[3];
bool first = true;
+ bool in_charge_parm_used;
+ int idx;
+ bool need_alias = false;
/* We only clone constructors and destructors. */
if (!DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)
/* Emit the DWARF1 abstract instance. */
(*debug_hooks->deferred_inline_function) (fn);
+ in_charge_parm_used = CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)) != NULL;
+ fns[0] = NULL_TREE;
+ fns[1] = NULL_TREE;
+ fns[2] = NULL_TREE;
+
+ /* 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
+ || DECL_NAME (clone) == complete_ctor_identifier)
+ fns[1] = clone;
+ else if (DECL_NAME (clone) == base_dtor_identifier
+ || DECL_NAME (clone) == base_ctor_identifier)
+ fns[0] = clone;
+ else if (DECL_NAME (clone) == deleting_dtor_identifier)
+ fns[2] = clone;
+ else
+ gcc_unreachable ();
+
+ /* Remember if we can't have multiple clones for some reason. We need to
+ check this before we remap local static initializers in clone_body. */
+ if (!tree_versionable_function_p (fn))
+ need_alias = true;
+
/* We know that any clones immediately follow FN in the TYPE_METHODS
list. */
push_to_top_level ();
- FOR_EACH_CLONE (clone, fn)
+ for (idx = 0; idx < 3; idx++)
{
tree parm;
tree clone_parm;
int parmno;
+ bool alias = false;
struct pointer_map_t *decl_map;
+ clone = fns[idx];
+ if (!clone)
+ continue;
+
/* Update CLONE's source position information to match FN's. */
DECL_SOURCE_LOCATION (clone) = DECL_SOURCE_LOCATION (fn);
- DECL_INLINE (clone) = DECL_INLINE (fn);
DECL_DECLARED_INLINE_P (clone) = DECL_DECLARED_INLINE_P (fn);
+ DECL_DECLARED_CONSTEXPR_P (clone) = DECL_DECLARED_CONSTEXPR_P (fn);
DECL_COMDAT (clone) = DECL_COMDAT (fn);
DECL_WEAK (clone) = DECL_WEAK (fn);
- DECL_ONE_ONLY (clone) = DECL_ONE_ONLY (fn);
+
+ /* We don't copy the comdat group from fn to clone because the assembler
+ name of fn was corrupted by write_mangled_name by adding *INTERNAL*
+ to it. By doing so, it also corrupted the comdat group. */
+ if (DECL_ONE_ONLY (fn))
+ DECL_COMDAT_GROUP (clone) = cxx_comdat_group (clone);
DECL_SECTION_NAME (clone) = DECL_SECTION_NAME (fn);
DECL_USE_TEMPLATE (clone) = DECL_USE_TEMPLATE (fn);
DECL_EXTERNAL (clone) = DECL_EXTERNAL (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);
+ DECL_ATTRIBUTES (clone) = copy_list (DECL_ATTRIBUTES (fn));
+ DECL_DISREGARD_INLINE_LIMITS (clone) = DECL_DISREGARD_INLINE_LIMITS (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);
+ parm = DECL_CHAIN (parm);
+ clone_parm = DECL_CHAIN (clone_parm);
if (DECL_HAS_IN_CHARGE_PARM_P (fn))
- parm = TREE_CHAIN (parm);
+ parm = DECL_CHAIN (parm);
if (DECL_HAS_VTT_PARM_P (fn))
- parm = TREE_CHAIN (parm);
+ parm = DECL_CHAIN (parm);
if (DECL_HAS_VTT_PARM_P (clone))
- clone_parm = TREE_CHAIN (clone_parm);
+ clone_parm = DECL_CHAIN (clone_parm);
for (; parm;
- parm = TREE_CHAIN (parm), clone_parm = TREE_CHAIN (clone_parm))
+ parm = DECL_CHAIN (parm), clone_parm = DECL_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);
- /* 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))
+ /* Tell cgraph if both ctors or both dtors are known to have
+ the same body. */
+ if (!in_charge_parm_used
+ && fns[0]
+ && idx == 1
+ && !flag_use_repository
+ && DECL_INTERFACE_KNOWN (fns[0])
+ && (SUPPORTS_ONE_ONLY || !DECL_WEAK (fns[0]))
+ && (!DECL_ONE_ONLY (fns[0])
+ || (HAVE_COMDAT_GROUP
+ && DECL_WEAK (fns[0])))
+ && !flag_syntax_only
+ /* Set linkage flags appropriately before
+ cgraph_create_function_alias looks at them. */
+ && expand_or_defer_fn_1 (clone)
+ && cgraph_same_body_alias (cgraph_get_node (fns[0]),
+ clone, fns[0]))
{
- /* 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)
+ alias = true;
+ if (DECL_ONE_ONLY (fns[0]))
{
- /* 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);
+ /* For comdat base and complete cdtors put them
+ into the same, *[CD]5* comdat group instead of
+ *[CD][12]*. */
+ comdat_group = cdtor_comdat_group (fns[1], fns[0]);
+ DECL_COMDAT_GROUP (fns[0]) = comdat_group;
+ cgraph_add_to_same_comdat_group (cgraph_get_node (clone),
+ cgraph_get_node (fns[0]));
}
}
- if (targetm.cxx.cdtor_returns_this ())
+ /* Build the delete destructor by calling complete destructor
+ and delete function. */
+ if (idx == 2)
{
- parm = DECL_RESULT (fn);
- clone_parm = DECL_RESULT (clone);
- *pointer_map_insert (decl_map, parm) = clone_parm;
+ build_delete_destructor_body (clone, fns[1]);
+ /* If *[CD][12]* dtors go into the *[CD]5* comdat group and dtor is
+ virtual, it goes into the same comdat group as well. */
+ if (comdat_group)
+ cgraph_add_to_same_comdat_group (cgraph_get_create_node (clone),
+ cgraph_get_node (fns[0]));
}
- /* Clone the body. */
- clone_body (clone, fn, decl_map);
+ else if (alias)
+ /* No need to populate body. */ ;
+ else
+ {
+ /* If we can't have multiple copies of FN (say, because there's a
+ static local initialized with the address of a label), we need
+ to use an alias for the complete variant. */
+ if (idx == 1 && need_alias)
+ {
+ if (DECL_STRUCT_FUNCTION (fn)->cannot_be_copied_set)
+ sorry (DECL_STRUCT_FUNCTION (fn)->cannot_be_copied_reason, fn);
+ else
+ sorry ("making multiple clones of %qD", fn);
+ }
- /* Clean up. */
- pointer_map_destroy (decl_map);
+ /* Remap the parameters. */
+ decl_map = pointer_map_create ();
+ for (parmno = 0,
+ parm = DECL_ARGUMENTS (fn),
+ clone_parm = DECL_ARGUMENTS (clone);
+ parm;
+ ++parmno,
+ parm = DECL_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 = DECL_CHAIN (clone_parm);
+ }
+ /* Otherwise, map the VTT parameter to `NULL'. */
+ else
+ *pointer_map_insert (decl_map, parm)
+ = fold_convert (TREE_TYPE (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 = DECL_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);
- expand_or_defer_fn (clone);
+ if (alias)
+ {
+ if (expand_or_defer_fn_1 (clone))
+ emit_associated_thunks (clone);
+ }
+ else
+ expand_or_defer_fn (clone);
first = false;
}
pop_from_top_level ();
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