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freebsd/contrib/gcc/integrate.c
2007-05-19 01:19:51 +00:00

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/* Procedure integration for GCC.
Copyright (C) 1988, 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
Contributed by Michael Tiemann (tiemann@cygnus.com)
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. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "tree.h"
#include "tm_p.h"
#include "regs.h"
#include "flags.h"
#include "debug.h"
#include "insn-config.h"
#include "expr.h"
#include "output.h"
#include "recog.h"
#include "integrate.h"
#include "real.h"
#include "except.h"
#include "function.h"
#include "toplev.h"
#include "intl.h"
#include "params.h"
#include "ggc.h"
#include "target.h"
#include "langhooks.h"
#include "tree-pass.h"
/* Round to the next highest integer that meets the alignment. */
#define CEIL_ROUND(VALUE,ALIGN) (((VALUE) + (ALIGN) - 1) & ~((ALIGN)- 1))
/* Private type used by {get/has}_hard_reg_initial_val. */
typedef struct initial_value_pair GTY(()) {
rtx hard_reg;
rtx pseudo;
} initial_value_pair;
typedef struct initial_value_struct GTY(()) {
int num_entries;
int max_entries;
initial_value_pair * GTY ((length ("%h.num_entries"))) entries;
} initial_value_struct;
static void set_block_origin_self (tree);
static void set_block_abstract_flags (tree, int);
/* Return false if the function FNDECL cannot be inlined on account of its
attributes, true otherwise. */
bool
function_attribute_inlinable_p (tree fndecl)
{
if (targetm.attribute_table)
{
tree a;
for (a = DECL_ATTRIBUTES (fndecl); a; a = TREE_CHAIN (a))
{
tree name = TREE_PURPOSE (a);
int i;
for (i = 0; targetm.attribute_table[i].name != NULL; i++)
if (is_attribute_p (targetm.attribute_table[i].name, name))
return targetm.function_attribute_inlinable_p (fndecl);
}
}
return true;
}
/* Given a pointer to some BLOCK node, if the BLOCK_ABSTRACT_ORIGIN for the
given BLOCK node is NULL, set the BLOCK_ABSTRACT_ORIGIN for the node so
that it points to the node itself, thus indicating that the node is its
own (abstract) origin. Additionally, if the BLOCK_ABSTRACT_ORIGIN for
the given node is NULL, recursively descend the decl/block tree which
it is the root of, and for each other ..._DECL or BLOCK node contained
therein whose DECL_ABSTRACT_ORIGINs or BLOCK_ABSTRACT_ORIGINs are also
still NULL, set *their* DECL_ABSTRACT_ORIGIN or BLOCK_ABSTRACT_ORIGIN
values to point to themselves. */
static void
set_block_origin_self (tree stmt)
{
if (BLOCK_ABSTRACT_ORIGIN (stmt) == NULL_TREE)
{
BLOCK_ABSTRACT_ORIGIN (stmt) = stmt;
{
tree local_decl;
for (local_decl = BLOCK_VARS (stmt);
local_decl != NULL_TREE;
local_decl = TREE_CHAIN (local_decl))
set_decl_origin_self (local_decl); /* Potential recursion. */
}
{
tree subblock;
for (subblock = BLOCK_SUBBLOCKS (stmt);
subblock != NULL_TREE;
subblock = BLOCK_CHAIN (subblock))
set_block_origin_self (subblock); /* Recurse. */
}
}
}
/* Given a pointer to some ..._DECL node, if the DECL_ABSTRACT_ORIGIN for
the given ..._DECL node is NULL, set the DECL_ABSTRACT_ORIGIN for the
node to so that it points to the node itself, thus indicating that the
node represents its own (abstract) origin. Additionally, if the
DECL_ABSTRACT_ORIGIN for the given node is NULL, recursively descend
the decl/block tree of which the given node is the root of, and for
each other ..._DECL or BLOCK node contained therein whose
DECL_ABSTRACT_ORIGINs or BLOCK_ABSTRACT_ORIGINs are also still NULL,
set *their* DECL_ABSTRACT_ORIGIN or BLOCK_ABSTRACT_ORIGIN values to
point to themselves. */
void
set_decl_origin_self (tree decl)
{
if (DECL_ABSTRACT_ORIGIN (decl) == NULL_TREE)
{
DECL_ABSTRACT_ORIGIN (decl) = decl;
if (TREE_CODE (decl) == FUNCTION_DECL)
{
tree arg;
for (arg = DECL_ARGUMENTS (decl); arg; arg = TREE_CHAIN (arg))
DECL_ABSTRACT_ORIGIN (arg) = arg;
if (DECL_INITIAL (decl) != NULL_TREE
&& DECL_INITIAL (decl) != error_mark_node)
set_block_origin_self (DECL_INITIAL (decl));
}
}
}
/* Given a pointer to some BLOCK node, and a boolean value to set the
"abstract" flags to, set that value into the BLOCK_ABSTRACT flag for
the given block, and for all local decls and all local sub-blocks
(recursively) which are contained therein. */
static void
set_block_abstract_flags (tree stmt, int setting)
{
tree local_decl;
tree subblock;
BLOCK_ABSTRACT (stmt) = setting;
for (local_decl = BLOCK_VARS (stmt);
local_decl != NULL_TREE;
local_decl = TREE_CHAIN (local_decl))
set_decl_abstract_flags (local_decl, setting);
for (subblock = BLOCK_SUBBLOCKS (stmt);
subblock != NULL_TREE;
subblock = BLOCK_CHAIN (subblock))
set_block_abstract_flags (subblock, setting);
}
/* Given a pointer to some ..._DECL node, and a boolean value to set the
"abstract" flags to, set that value into the DECL_ABSTRACT flag for the
given decl, and (in the case where the decl is a FUNCTION_DECL) also
set the abstract flags for all of the parameters, local vars, local
blocks and sub-blocks (recursively) to the same setting. */
void
set_decl_abstract_flags (tree decl, int setting)
{
DECL_ABSTRACT (decl) = setting;
if (TREE_CODE (decl) == FUNCTION_DECL)
{
tree arg;
for (arg = DECL_ARGUMENTS (decl); arg; arg = TREE_CHAIN (arg))
DECL_ABSTRACT (arg) = setting;
if (DECL_INITIAL (decl) != NULL_TREE
&& DECL_INITIAL (decl) != error_mark_node)
set_block_abstract_flags (DECL_INITIAL (decl), setting);
}
}
/* Functions to keep track of the values hard regs had at the start of
the function. */
rtx
get_hard_reg_initial_reg (struct function *fun, rtx reg)
{
struct initial_value_struct *ivs = fun->hard_reg_initial_vals;
int i;
if (ivs == 0)
return NULL_RTX;
for (i = 0; i < ivs->num_entries; i++)
if (rtx_equal_p (ivs->entries[i].pseudo, reg))
return ivs->entries[i].hard_reg;
return NULL_RTX;
}
/* Make sure that there's a pseudo register of mode MODE that stores the
initial value of hard register REGNO. Return an rtx for such a pseudo. */
rtx
get_hard_reg_initial_val (enum machine_mode mode, unsigned int regno)
{
struct initial_value_struct *ivs;
rtx rv;
rv = has_hard_reg_initial_val (mode, regno);
if (rv)
return rv;
ivs = cfun->hard_reg_initial_vals;
if (ivs == 0)
{
ivs = ggc_alloc (sizeof (initial_value_struct));
ivs->num_entries = 0;
ivs->max_entries = 5;
ivs->entries = ggc_alloc (5 * sizeof (initial_value_pair));
cfun->hard_reg_initial_vals = ivs;
}
if (ivs->num_entries >= ivs->max_entries)
{
ivs->max_entries += 5;
ivs->entries = ggc_realloc (ivs->entries,
ivs->max_entries
* sizeof (initial_value_pair));
}
ivs->entries[ivs->num_entries].hard_reg = gen_rtx_REG (mode, regno);
ivs->entries[ivs->num_entries].pseudo = gen_reg_rtx (mode);
return ivs->entries[ivs->num_entries++].pseudo;
}
/* See if get_hard_reg_initial_val has been used to create a pseudo
for the initial value of hard register REGNO in mode MODE. Return
the associated pseudo if so, otherwise return NULL. */
rtx
has_hard_reg_initial_val (enum machine_mode mode, unsigned int regno)
{
struct initial_value_struct *ivs;
int i;
ivs = cfun->hard_reg_initial_vals;
if (ivs != 0)
for (i = 0; i < ivs->num_entries; i++)
if (GET_MODE (ivs->entries[i].hard_reg) == mode
&& REGNO (ivs->entries[i].hard_reg) == regno)
return ivs->entries[i].pseudo;
return NULL_RTX;
}
unsigned int
emit_initial_value_sets (void)
{
struct initial_value_struct *ivs = cfun->hard_reg_initial_vals;
int i;
rtx seq;
if (ivs == 0)
return 0;
start_sequence ();
for (i = 0; i < ivs->num_entries; i++)
emit_move_insn (ivs->entries[i].pseudo, ivs->entries[i].hard_reg);
seq = get_insns ();
end_sequence ();
emit_insn_at_entry (seq);
return 0;
}
struct tree_opt_pass pass_initial_value_sets =
{
"initvals", /* name */
NULL, /* gate */
emit_initial_value_sets, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
0, /* tv_id */
0, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
TODO_dump_func, /* todo_flags_finish */
0 /* letter */
};
/* If the backend knows where to allocate pseudos for hard
register initial values, register these allocations now. */
void
allocate_initial_values (rtx *reg_equiv_memory_loc ATTRIBUTE_UNUSED)
{
if (targetm.allocate_initial_value)
{
struct initial_value_struct *ivs = cfun->hard_reg_initial_vals;
int i;
if (ivs == 0)
return;
for (i = 0; i < ivs->num_entries; i++)
{
int regno = REGNO (ivs->entries[i].pseudo);
rtx x = targetm.allocate_initial_value (ivs->entries[i].hard_reg);
if (x && REG_N_SETS (REGNO (ivs->entries[i].pseudo)) <= 1)
{
if (MEM_P (x))
reg_equiv_memory_loc[regno] = x;
else
{
basic_block bb;
int new_regno;
gcc_assert (REG_P (x));
new_regno = REGNO (x);
reg_renumber[regno] = new_regno;
/* Poke the regno right into regno_reg_rtx so that even
fixed regs are accepted. */
REGNO (ivs->entries[i].pseudo) = new_regno;
/* Update global register liveness information. */
FOR_EACH_BB (bb)
{
struct rtl_bb_info *info = bb->il.rtl;
if (REGNO_REG_SET_P(info->global_live_at_start, regno))
SET_REGNO_REG_SET (info->global_live_at_start,
new_regno);
if (REGNO_REG_SET_P(info->global_live_at_end, regno))
SET_REGNO_REG_SET (info->global_live_at_end,
new_regno);
}
}
}
}
}
}
#include "gt-integrate.h"