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/* SSA operand allocation and finalizing.
Copyright (C) 2005 Free Software Foundation, Inc.
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 2, 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 COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA. */
/* This file contains common code which is used by each of the 5 operand
types. Macros are defined to specify the varying components.
FINALIZE_FUNC - name of finalize function.
FINALIZE_ALLOC - name of allocation routine.
FINALIZE_FREE - name of free list.
FINALIZE_TYPE - type of node.
FINALIZE_OPS - Lead element in list.
FINALIZE_USE_PTR - How to get the use_operand_p, if this is a use operand.
FINALIZE_INITIALIZE - How to initialize an element.
FINALIZE_ELEM - How to retrieve an element.
FINALIZE_BASE - How to retrieve the base variable of an element.
FINALIZE_BASE_TYPE - Type of the base variable.
FINALIZE_OPBUILD - Opbuild array for these nodes.
FINALIZE_OPBUILD_ELEM - How to get an element from the opbuild list.
FINALIZE_OPBUILD_BASE - How to get an element base from the opbuild list.
FINALIZE_BASE_ZERO - How to zero an element. */
/* This routine will either pick up a node from the free list, or allocate a
new one if need be. */
static inline FINALIZE_TYPE *
FINALIZE_ALLOC (void)
{
FINALIZE_TYPE *ret;
if (FINALIZE_FREE)
{
ret = FINALIZE_FREE;
FINALIZE_FREE = FINALIZE_FREE->next;
}
else
ret = (FINALIZE_TYPE *)ssa_operand_alloc (sizeof (FINALIZE_TYPE));
return ret;
}
/* This routine will take the new operands from FINALIZE_OPBUILD and turn them
into the new operands for STMT. All required linking and deleting is u
performed here. */
static inline void
FINALIZE_FUNC (tree stmt)
{
unsigned new_i;
FINALIZE_TYPE *old_ops, *ptr, *last;
FINALIZE_BASE_TYPE old_base;
FINALIZE_TYPE new_list;
new_list.next = NULL;
last = &new_list;
old_ops = FINALIZE_OPS (stmt);
if (old_ops)
old_base = FINALIZE_BASE (FINALIZE_ELEM (old_ops));
else
old_base = FINALIZE_BASE_ZERO;
new_i = 0;
while (old_ops && new_i < VEC_length (tree, FINALIZE_OPBUILD))
{
FINALIZE_BASE_TYPE new_base = FINALIZE_OPBUILD_BASE (new_i);
if (old_base == new_base)
{
/* if variables are the same, reuse this node. */
last->next = old_ops;
last = old_ops;
#ifdef FINALIZE_CORRECT_USE
FINALIZE_CORRECT_USE (FINALIZE_USE_PTR (last), stmt);
#endif
old_ops = old_ops->next;
new_i++;
}
else
if (old_base < new_base)
{
/* if old is less than new, old goes to the free list. */
#ifdef FINALIZE_USE_PTR
use_operand_p use_p = FINALIZE_USE_PTR (old_ops);
delink_imm_use (use_p);
#endif
ptr = old_ops;
old_ops = old_ops->next;
ptr->next = FINALIZE_FREE;
FINALIZE_FREE = ptr;
}
else
{
/* This is a new operand. */
ptr = FINALIZE_ALLOC ();
FINALIZE_INITIALIZE (ptr, FINALIZE_OPBUILD_ELEM (new_i), stmt);
last->next = ptr;
last = ptr;
new_i++;
}
if (old_ops)
old_base = FINALIZE_BASE (FINALIZE_ELEM (old_ops));
}
/* If there is anything remaining in the opbuild list, simply emit them. */
for ( ; new_i < VEC_length (tree, FINALIZE_OPBUILD); new_i++)
{
ptr = FINALIZE_ALLOC ();
FINALIZE_INITIALIZE (ptr, FINALIZE_OPBUILD_ELEM (new_i), stmt);
last->next = ptr;
last = ptr;
}
last->next = NULL;
/* If there is anything in the old list, free them. */
if (old_ops)
{
#ifdef FINALIZE_USE_PTR
for (ptr = old_ops; ptr; ptr = ptr->next)
{
use_operand_p use_p = FINALIZE_USE_PTR (ptr);
delink_imm_use (use_p);
}
#endif
old_ops->next = FINALIZE_FREE;
FINALIZE_FREE = old_ops;
}
/* NOw set the stmt's operands. */
FINALIZE_OPS (stmt) = new_list.next;
#ifdef ENABLE_CHECKING
{
unsigned x = 0;
for (ptr = FINALIZE_OPS (stmt); ptr; ptr = ptr->next)
x++;
gcc_assert (x == VEC_length (tree, FINALIZE_OPBUILD));
}
#endif
}
#undef FINALIZE_FUNC
#undef FINALIZE_ALLOC
#undef FINALIZE_FREE
#undef FINALIZE_TYPE
#undef FINALIZE_OPS
#undef FINALIZE_USE_PTR
#undef FINALIZE_INITIALIZE
#undef FINALIZE_ELEM
#undef FINALIZE_BASE
#undef FINALIZE_BASE_TYPE
#undef FINALIZE_OPBUILD
#undef FINALIZE_OPBUILD_ELEM
#undef FINALIZE_OPBUILD_BASE
#undef FINALIZE_BASE_ZERO
#undef FINALIZE_CORRECT_USE
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