219 lines
6.9 KiB
C
219 lines
6.9 KiB
C
/* Perform optimizations on tree structure.
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2005
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Free Software Foundation, Inc.
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Written by Mark Michell (mark@codesourcery.com).
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "tree.h"
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#include "cp-tree.h"
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#include "rtl.h"
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#include "insn-config.h"
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#include "input.h"
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#include "integrate.h"
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#include "toplev.h"
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#include "varray.h"
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#include "params.h"
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#include "hashtab.h"
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#include "target.h"
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#include "debug.h"
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#include "tree-inline.h"
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#include "flags.h"
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#include "langhooks.h"
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#include "diagnostic.h"
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#include "tree-dump.h"
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#include "tree-gimple.h"
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/* Prototypes. */
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static void update_cloned_parm (tree, tree, bool);
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/* CLONED_PARM is a copy of CLONE, generated for a cloned constructor
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or destructor. Update it to ensure that the source-position for
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the cloned parameter matches that for the original, and that the
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debugging generation code will be able to find the original PARM. */
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static void
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update_cloned_parm (tree parm, tree cloned_parm, bool first)
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{
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DECL_ABSTRACT_ORIGIN (cloned_parm) = parm;
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/* We may have taken its address. */
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TREE_ADDRESSABLE (cloned_parm) = TREE_ADDRESSABLE (parm);
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/* The definition might have different constness. */
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TREE_READONLY (cloned_parm) = TREE_READONLY (parm);
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TREE_USED (cloned_parm) = !first || TREE_USED (parm);
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/* The name may have changed from the declaration. */
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DECL_NAME (cloned_parm) = DECL_NAME (parm);
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DECL_SOURCE_LOCATION (cloned_parm) = DECL_SOURCE_LOCATION (parm);
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TREE_TYPE (cloned_parm) = TREE_TYPE (parm);
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DECL_COMPLEX_GIMPLE_REG_P (cloned_parm) = DECL_COMPLEX_GIMPLE_REG_P (parm);
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}
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/* FN is a function that has a complete body. Clone the body as
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necessary. Returns nonzero if there's no longer any need to
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process the main body. */
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bool
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maybe_clone_body (tree fn)
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{
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tree clone;
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bool first = true;
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/* We only clone constructors and destructors. */
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if (!DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)
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&& !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn))
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return 0;
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/* Emit the DWARF1 abstract instance. */
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(*debug_hooks->deferred_inline_function) (fn);
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/* We know that any clones immediately follow FN in the TYPE_METHODS
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list. */
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push_to_top_level ();
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FOR_EACH_CLONE (clone, fn)
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{
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tree parm;
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tree clone_parm;
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int parmno;
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splay_tree decl_map;
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/* Update CLONE's source position information to match FN's. */
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DECL_SOURCE_LOCATION (clone) = DECL_SOURCE_LOCATION (fn);
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DECL_INLINE (clone) = DECL_INLINE (fn);
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DECL_DECLARED_INLINE_P (clone) = DECL_DECLARED_INLINE_P (fn);
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DECL_COMDAT (clone) = DECL_COMDAT (fn);
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DECL_WEAK (clone) = DECL_WEAK (fn);
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DECL_ONE_ONLY (clone) = DECL_ONE_ONLY (fn);
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DECL_SECTION_NAME (clone) = DECL_SECTION_NAME (fn);
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DECL_USE_TEMPLATE (clone) = DECL_USE_TEMPLATE (fn);
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DECL_EXTERNAL (clone) = DECL_EXTERNAL (fn);
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DECL_INTERFACE_KNOWN (clone) = DECL_INTERFACE_KNOWN (fn);
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DECL_NOT_REALLY_EXTERN (clone) = DECL_NOT_REALLY_EXTERN (fn);
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TREE_PUBLIC (clone) = TREE_PUBLIC (fn);
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DECL_VISIBILITY (clone) = DECL_VISIBILITY (fn);
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DECL_VISIBILITY_SPECIFIED (clone) = DECL_VISIBILITY_SPECIFIED (fn);
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/* Adjust the parameter names and locations. */
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parm = DECL_ARGUMENTS (fn);
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clone_parm = DECL_ARGUMENTS (clone);
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/* Update the `this' parameter, which is always first. */
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update_cloned_parm (parm, clone_parm, first);
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parm = TREE_CHAIN (parm);
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clone_parm = TREE_CHAIN (clone_parm);
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if (DECL_HAS_IN_CHARGE_PARM_P (fn))
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parm = TREE_CHAIN (parm);
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if (DECL_HAS_VTT_PARM_P (fn))
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parm = TREE_CHAIN (parm);
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if (DECL_HAS_VTT_PARM_P (clone))
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clone_parm = TREE_CHAIN (clone_parm);
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for (; parm;
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parm = TREE_CHAIN (parm), clone_parm = TREE_CHAIN (clone_parm))
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/* Update this parameter. */
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update_cloned_parm (parm, clone_parm, first);
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/* Start processing the function. */
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start_preparsed_function (clone, NULL_TREE, SF_PRE_PARSED);
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/* Remap the parameters. */
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decl_map = splay_tree_new (splay_tree_compare_pointers, NULL, NULL);
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for (parmno = 0,
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parm = DECL_ARGUMENTS (fn),
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clone_parm = DECL_ARGUMENTS (clone);
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parm;
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++parmno,
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parm = TREE_CHAIN (parm))
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{
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/* Map the in-charge parameter to an appropriate constant. */
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if (DECL_HAS_IN_CHARGE_PARM_P (fn) && parmno == 1)
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{
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tree in_charge;
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in_charge = in_charge_arg_for_name (DECL_NAME (clone));
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splay_tree_insert (decl_map,
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(splay_tree_key) parm,
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(splay_tree_value) in_charge);
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}
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else if (DECL_ARTIFICIAL (parm)
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&& DECL_NAME (parm) == vtt_parm_identifier)
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{
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/* For a subobject constructor or destructor, the next
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argument is the VTT parameter. Remap the VTT_PARM
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from the CLONE to this parameter. */
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if (DECL_HAS_VTT_PARM_P (clone))
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{
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DECL_ABSTRACT_ORIGIN (clone_parm) = parm;
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splay_tree_insert (decl_map,
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(splay_tree_key) parm,
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(splay_tree_value) clone_parm);
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clone_parm = TREE_CHAIN (clone_parm);
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}
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/* Otherwise, map the VTT parameter to `NULL'. */
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else
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{
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splay_tree_insert (decl_map,
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(splay_tree_key) parm,
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(splay_tree_value) null_pointer_node);
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}
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}
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/* Map other parameters to their equivalents in the cloned
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function. */
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else
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{
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splay_tree_insert (decl_map,
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(splay_tree_key) parm,
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(splay_tree_value) clone_parm);
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clone_parm = TREE_CHAIN (clone_parm);
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}
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}
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if (targetm.cxx.cdtor_returns_this ())
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{
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parm = DECL_RESULT (fn);
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clone_parm = DECL_RESULT (clone);
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splay_tree_insert (decl_map, (splay_tree_key) parm,
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(splay_tree_value) clone_parm);
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}
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/* Clone the body. */
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clone_body (clone, fn, decl_map);
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/* Clean up. */
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splay_tree_delete (decl_map);
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/* The clone can throw iff the original function can throw. */
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cp_function_chain->can_throw = !TREE_NOTHROW (fn);
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/* Now, expand this function into RTL, if appropriate. */
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finish_function (0);
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BLOCK_ABSTRACT_ORIGIN (DECL_INITIAL (clone)) = DECL_INITIAL (fn);
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expand_or_defer_fn (clone);
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first = false;
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}
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pop_from_top_level ();
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/* We don't need to process the original function any further. */
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return 1;
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}
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