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"
47 static void update_cloned_parm (tree
, tree
, bool);
49 /* CLONED_PARM is a copy of CLONE, generated for a cloned constructor
50 or destructor. Update it to ensure that the source-position for
51 the cloned parameter matches that for the original, and that the
52 debugging generation code will be able to find the original PARM. */
55 update_cloned_parm (tree parm
, tree cloned_parm
, bool first
)
57 DECL_ABSTRACT_ORIGIN (cloned_parm
) = parm
;
59 /* We may have taken its address. */
60 TREE_ADDRESSABLE (cloned_parm
) = TREE_ADDRESSABLE (parm
);
62 /* The definition might have different constness. */
63 TREE_READONLY (cloned_parm
) = TREE_READONLY (parm
);
65 TREE_USED (cloned_parm
) = !first
|| TREE_USED (parm
);
67 /* The name may have changed from the declaration. */
68 DECL_NAME (cloned_parm
) = DECL_NAME (parm
);
69 DECL_SOURCE_LOCATION (cloned_parm
) = DECL_SOURCE_LOCATION (parm
);
70 TREE_TYPE (cloned_parm
) = TREE_TYPE (parm
);
72 DECL_GIMPLE_REG_P (cloned_parm
) = DECL_GIMPLE_REG_P (parm
);
76 /* FN is a function in High GIMPLE form that has a complete body and no
77 CFG. CLONE is a function whose body is to be set to a copy of FN,
78 mapping argument declarations according to the ARG_MAP splay_tree. */
81 clone_body (tree clone
, tree fn
, void *arg_map
)
86 /* FN must already be in GIMPLE form. */
87 gcc_assert (gimple_body (fn
));
89 /* Clone the body, as if we were making an inline call. But, remap
90 the parameters in the callee to the parameters of caller. */
91 memset (&id
, 0, sizeof (id
));
94 id
.src_cfun
= DECL_STRUCT_FUNCTION (fn
);
95 id
.decl_map
= (struct pointer_map_t
*) arg_map
;
97 id
.copy_decl
= copy_decl_no_change
;
98 id
.transform_call_graph_edges
= CB_CGE_DUPLICATE
;
99 id
.transform_new_cfg
= true;
100 id
.transform_return_to_modify
= false;
101 id
.transform_lang_insert_block
= NULL
;
103 /* We're not inside any EH region. */
106 /* Actually copy the body. */
107 new_body
= remap_gimple_seq (gimple_body (fn
), &id
);
108 gimple_set_body (clone
, new_body
);
111 /* FN is a function that has a complete body. Clone the body as
112 necessary. Returns nonzero if there's no longer any need to
113 process the main body. */
116 maybe_clone_body (tree fn
)
121 /* We only clone constructors and destructors. */
122 if (!DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn
)
123 && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn
))
126 /* Emit the DWARF1 abstract instance. */
127 (*debug_hooks
->deferred_inline_function
) (fn
);
129 /* We know that any clones immediately follow FN in the TYPE_METHODS
131 push_to_top_level ();
132 FOR_EACH_CLONE (clone
, fn
)
137 struct pointer_map_t
*decl_map
;
139 /* Update CLONE's source position information to match FN's. */
140 DECL_SOURCE_LOCATION (clone
) = DECL_SOURCE_LOCATION (fn
);
141 DECL_DECLARED_INLINE_P (clone
) = DECL_DECLARED_INLINE_P (fn
);
142 DECL_COMDAT (clone
) = DECL_COMDAT (fn
);
143 DECL_WEAK (clone
) = DECL_WEAK (fn
);
145 /* We don't copy the comdat group from fn to clone because the assembler
146 name of fn was corrupted by write_mangled_name by adding *INTERNAL*
147 to it. By doing so, it also corrupted the comdat group. */
148 if (DECL_ONE_ONLY (fn
))
149 DECL_COMDAT_GROUP (clone
) = cxx_comdat_group (clone
);
150 DECL_SECTION_NAME (clone
) = DECL_SECTION_NAME (fn
);
151 DECL_USE_TEMPLATE (clone
) = DECL_USE_TEMPLATE (fn
);
152 DECL_EXTERNAL (clone
) = DECL_EXTERNAL (fn
);
153 DECL_INTERFACE_KNOWN (clone
) = DECL_INTERFACE_KNOWN (fn
);
154 DECL_NOT_REALLY_EXTERN (clone
) = DECL_NOT_REALLY_EXTERN (fn
);
155 TREE_PUBLIC (clone
) = TREE_PUBLIC (fn
);
156 DECL_VISIBILITY (clone
) = DECL_VISIBILITY (fn
);
157 DECL_VISIBILITY_SPECIFIED (clone
) = DECL_VISIBILITY_SPECIFIED (fn
);
158 DECL_DLLIMPORT_P (clone
) = DECL_DLLIMPORT_P (fn
);
160 /* Adjust the parameter names and locations. */
161 parm
= DECL_ARGUMENTS (fn
);
162 clone_parm
= DECL_ARGUMENTS (clone
);
163 /* Update the `this' parameter, which is always first. */
164 update_cloned_parm (parm
, clone_parm
, first
);
165 parm
= TREE_CHAIN (parm
);
166 clone_parm
= TREE_CHAIN (clone_parm
);
167 if (DECL_HAS_IN_CHARGE_PARM_P (fn
))
168 parm
= TREE_CHAIN (parm
);
169 if (DECL_HAS_VTT_PARM_P (fn
))
170 parm
= TREE_CHAIN (parm
);
171 if (DECL_HAS_VTT_PARM_P (clone
))
172 clone_parm
= TREE_CHAIN (clone_parm
);
174 parm
= TREE_CHAIN (parm
), clone_parm
= TREE_CHAIN (clone_parm
))
175 /* Update this parameter. */
176 update_cloned_parm (parm
, clone_parm
, first
);
178 /* Start processing the function. */
179 start_preparsed_function (clone
, NULL_TREE
, SF_PRE_PARSED
);
181 /* Remap the parameters. */
182 decl_map
= pointer_map_create ();
184 parm
= DECL_ARGUMENTS (fn
),
185 clone_parm
= DECL_ARGUMENTS (clone
);
188 parm
= TREE_CHAIN (parm
))
190 /* Map the in-charge parameter to an appropriate constant. */
191 if (DECL_HAS_IN_CHARGE_PARM_P (fn
) && parmno
== 1)
194 in_charge
= in_charge_arg_for_name (DECL_NAME (clone
));
195 *pointer_map_insert (decl_map
, parm
) = in_charge
;
197 else if (DECL_ARTIFICIAL (parm
)
198 && DECL_NAME (parm
) == vtt_parm_identifier
)
200 /* For a subobject constructor or destructor, the next
201 argument is the VTT parameter. Remap the VTT_PARM
202 from the CLONE to this parameter. */
203 if (DECL_HAS_VTT_PARM_P (clone
))
205 DECL_ABSTRACT_ORIGIN (clone_parm
) = parm
;
206 *pointer_map_insert (decl_map
, parm
) = clone_parm
;
207 clone_parm
= TREE_CHAIN (clone_parm
);
209 /* Otherwise, map the VTT parameter to `NULL'. */
211 *pointer_map_insert (decl_map
, parm
) = null_pointer_node
;
213 /* Map other parameters to their equivalents in the cloned
217 *pointer_map_insert (decl_map
, parm
) = clone_parm
;
218 clone_parm
= TREE_CHAIN (clone_parm
);
222 if (targetm
.cxx
.cdtor_returns_this ())
224 parm
= DECL_RESULT (fn
);
225 clone_parm
= DECL_RESULT (clone
);
226 *pointer_map_insert (decl_map
, parm
) = clone_parm
;
228 /* Clone the body. */
229 clone_body (clone
, fn
, decl_map
);
232 pointer_map_destroy (decl_map
);
234 /* The clone can throw iff the original function can throw. */
235 cp_function_chain
->can_throw
= !TREE_NOTHROW (fn
);
237 /* Now, expand this function into RTL, if appropriate. */
239 BLOCK_ABSTRACT_ORIGIN (DECL_INITIAL (clone
)) = DECL_INITIAL (fn
);
240 DECL_SAVED_TREE (clone
) = NULL
;
241 expand_or_defer_fn (clone
);
244 pop_from_top_level ();
246 /* We don't need to process the original function any further. */