1 /* Perform optimizations on tree structure.
2 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2008
3 Free Software Foundation, Inc.
4 Written by Mark Michell (mark@codesourcery.com).
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
29 #include "insn-config.h"
31 #include "integrate.h"
38 #include "tree-inline.h"
40 #include "langhooks.h"
41 #include "diagnostic.h"
42 #include "tree-dump.h"
44 #include "tree-iterator.h"
48 static void update_cloned_parm (tree, tree, bool);
50 /* CLONED_PARM is a copy of CLONE, generated for a cloned constructor
51 or destructor. Update it to ensure that the source-position for
52 the cloned parameter matches that for the original, and that the
53 debugging generation code will be able to find the original PARM. */
56 update_cloned_parm (tree parm, tree cloned_parm, bool first)
58 DECL_ABSTRACT_ORIGIN (cloned_parm) = parm;
60 /* We may have taken its address. */
61 TREE_ADDRESSABLE (cloned_parm) = TREE_ADDRESSABLE (parm);
63 /* The definition might have different constness. */
64 TREE_READONLY (cloned_parm) = TREE_READONLY (parm);
66 TREE_USED (cloned_parm) = !first || TREE_USED (parm);
68 /* The name may have changed from the declaration. */
69 DECL_NAME (cloned_parm) = DECL_NAME (parm);
70 DECL_SOURCE_LOCATION (cloned_parm) = DECL_SOURCE_LOCATION (parm);
71 TREE_TYPE (cloned_parm) = TREE_TYPE (parm);
73 DECL_GIMPLE_REG_P (cloned_parm) = DECL_GIMPLE_REG_P (parm);
77 /* FN is a function in High GIMPLE form that has a complete body and no
78 CFG. CLONE is a function whose body is to be set to a copy of FN,
79 mapping argument declarations according to the ARG_MAP splay_tree. */
82 clone_body (tree clone, tree fn, void *arg_map)
87 /* Clone the body, as if we were making an inline call. But, remap
88 the parameters in the callee to the parameters of caller. */
89 memset (&id, 0, sizeof (id));
92 id.src_cfun = DECL_STRUCT_FUNCTION (fn);
93 id.decl_map = (struct pointer_map_t *) arg_map;
95 id.copy_decl = copy_decl_no_change;
96 id.transform_call_graph_edges = CB_CGE_DUPLICATE;
97 id.transform_new_cfg = true;
98 id.transform_return_to_modify = false;
99 id.transform_lang_insert_block = NULL;
101 /* We're not inside any EH region. */
104 stmts = DECL_SAVED_TREE (fn);
105 walk_tree (&stmts, copy_tree_body_r, &id, NULL);
106 append_to_statement_list_force (stmts, &DECL_SAVED_TREE (clone));
109 /* FN is a function that has a complete body. Clone the body as
110 necessary. Returns nonzero if there's no longer any need to
111 process the main body. */
114 maybe_clone_body (tree fn)
119 /* We only clone constructors and destructors. */
120 if (!DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)
121 && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn))
124 /* Emit the DWARF1 abstract instance. */
125 (*debug_hooks->deferred_inline_function) (fn);
127 /* We know that any clones immediately follow FN in the TYPE_METHODS
129 push_to_top_level ();
130 FOR_EACH_CLONE (clone, fn)
135 struct pointer_map_t *decl_map;
137 /* Update CLONE's source position information to match FN's. */
138 DECL_SOURCE_LOCATION (clone) = DECL_SOURCE_LOCATION (fn);
139 DECL_DECLARED_INLINE_P (clone) = DECL_DECLARED_INLINE_P (fn);
140 DECL_COMDAT (clone) = DECL_COMDAT (fn);
141 DECL_WEAK (clone) = DECL_WEAK (fn);
143 /* We don't copy the comdat group from fn to clone because the assembler
144 name of fn was corrupted by write_mangled_name by adding *INTERNAL*
145 to it. By doing so, it also corrupted the comdat group. */
146 if (DECL_ONE_ONLY (fn))
147 DECL_COMDAT_GROUP (clone) = cxx_comdat_group (clone);
148 DECL_SECTION_NAME (clone) = DECL_SECTION_NAME (fn);
149 DECL_USE_TEMPLATE (clone) = DECL_USE_TEMPLATE (fn);
150 DECL_EXTERNAL (clone) = DECL_EXTERNAL (fn);
151 DECL_INTERFACE_KNOWN (clone) = DECL_INTERFACE_KNOWN (fn);
152 DECL_NOT_REALLY_EXTERN (clone) = DECL_NOT_REALLY_EXTERN (fn);
153 TREE_PUBLIC (clone) = TREE_PUBLIC (fn);
154 DECL_VISIBILITY (clone) = DECL_VISIBILITY (fn);
155 DECL_VISIBILITY_SPECIFIED (clone) = DECL_VISIBILITY_SPECIFIED (fn);
156 DECL_DLLIMPORT_P (clone) = DECL_DLLIMPORT_P (fn);
158 /* Adjust the parameter names and locations. */
159 parm = DECL_ARGUMENTS (fn);
160 clone_parm = DECL_ARGUMENTS (clone);
161 /* Update the `this' parameter, which is always first. */
162 update_cloned_parm (parm, clone_parm, first);
163 parm = TREE_CHAIN (parm);
164 clone_parm = TREE_CHAIN (clone_parm);
165 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
166 parm = TREE_CHAIN (parm);
167 if (DECL_HAS_VTT_PARM_P (fn))
168 parm = TREE_CHAIN (parm);
169 if (DECL_HAS_VTT_PARM_P (clone))
170 clone_parm = TREE_CHAIN (clone_parm);
172 parm = TREE_CHAIN (parm), clone_parm = TREE_CHAIN (clone_parm))
173 /* Update this parameter. */
174 update_cloned_parm (parm, clone_parm, first);
176 /* Start processing the function. */
177 start_preparsed_function (clone, NULL_TREE, SF_PRE_PARSED);
179 /* Remap the parameters. */
180 decl_map = pointer_map_create ();
182 parm = DECL_ARGUMENTS (fn),
183 clone_parm = DECL_ARGUMENTS (clone);
186 parm = TREE_CHAIN (parm))
188 /* Map the in-charge parameter to an appropriate constant. */
189 if (DECL_HAS_IN_CHARGE_PARM_P (fn) && parmno == 1)
192 in_charge = in_charge_arg_for_name (DECL_NAME (clone));
193 *pointer_map_insert (decl_map, parm) = in_charge;
195 else if (DECL_ARTIFICIAL (parm)
196 && DECL_NAME (parm) == vtt_parm_identifier)
198 /* For a subobject constructor or destructor, the next
199 argument is the VTT parameter. Remap the VTT_PARM
200 from the CLONE to this parameter. */
201 if (DECL_HAS_VTT_PARM_P (clone))
203 DECL_ABSTRACT_ORIGIN (clone_parm) = parm;
204 *pointer_map_insert (decl_map, parm) = clone_parm;
205 clone_parm = TREE_CHAIN (clone_parm);
207 /* Otherwise, map the VTT parameter to `NULL'. */
209 *pointer_map_insert (decl_map, parm)
210 = fold_convert (TREE_TYPE (parm), null_pointer_node);
212 /* Map other parameters to their equivalents in the cloned
216 *pointer_map_insert (decl_map, parm) = clone_parm;
217 clone_parm = TREE_CHAIN (clone_parm);
221 if (targetm.cxx.cdtor_returns_this ())
223 parm = DECL_RESULT (fn);
224 clone_parm = DECL_RESULT (clone);
225 *pointer_map_insert (decl_map, parm) = clone_parm;
227 /* Clone the body. */
228 clone_body (clone, fn, decl_map);
231 pointer_map_destroy (decl_map);
233 /* The clone can throw iff the original function can throw. */
234 cp_function_chain->can_throw = !TREE_NOTHROW (fn);
236 /* Now, expand this function into RTL, if appropriate. */
238 BLOCK_ABSTRACT_ORIGIN (DECL_INITIAL (clone)) = DECL_INITIAL (fn);
239 expand_or_defer_fn (clone);
242 pop_from_top_level ();
244 /* We don't need to process the original function any further. */