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df-scan.c
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df-scan.c
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/* Scanning of rtl for dataflow analysis.
Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
2008, 2009 Free Software Foundation, Inc.
Originally contributed by Michael P. Hayes
(m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com)
Major rewrite contributed by Danny Berlin (dberlin@dberlin.org)
and Kenneth Zadeck (zadeck@naturalbridge.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 3, 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 COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "tm_p.h"
#include "insn-config.h"
#include "recog.h"
#include "function.h"
#include "regs.h"
#include "output.h"
#include "alloc-pool.h"
#include "flags.h"
#include "hard-reg-set.h"
#include "basic-block.h"
#include "sbitmap.h"
#include "bitmap.h"
#include "timevar.h"
#include "tree.h"
#include "target.h"
#include "target-def.h"
#include "df.h"
#include "tree-pass.h"
#ifndef HAVE_epilogue
#define HAVE_epilogue 0
#endif
#ifndef HAVE_prologue
#define HAVE_prologue 0
#endif
#ifndef HAVE_sibcall_epilogue
#define HAVE_sibcall_epilogue 0
#endif
#ifndef EPILOGUE_USES
#define EPILOGUE_USES(REGNO) 0
#endif
/* The following two macros free the vecs that hold either the refs or
the mw refs. They are a little tricky because the vec has 0
elements is special and is not to be freed. */
#define df_scan_free_ref_vec(V) \
do { \
if (V && *V) \
free (V); \
} while (0)
#define df_scan_free_mws_vec(V) \
do { \
if (V && *V) \
free (V); \
} while (0)
/* The set of hard registers in eliminables[i].from. */
static HARD_REG_SET elim_reg_set;
/* Initialize ur_in and ur_out as if all hard registers were partially
available. */
struct df_collection_rec
{
df_ref * def_vec;
df_ref * use_vec;
unsigned int next_def;
unsigned int next_use;
df_ref * eq_use_vec;
struct df_mw_hardreg **mw_vec;
unsigned int next_eq_use;
unsigned int next_mw;
};
static df_ref df_null_ref_rec[1];
static struct df_mw_hardreg * df_null_mw_rec[1];
static void df_ref_record (enum df_ref_class, struct df_collection_rec *,
rtx, rtx *,
basic_block, struct df_insn_info *,
enum df_ref_type, enum df_ref_flags,
int, int, enum machine_mode);
static void df_def_record_1 (struct df_collection_rec *, rtx,
basic_block, struct df_insn_info *,
enum df_ref_flags);
static void df_defs_record (struct df_collection_rec *, rtx,
basic_block, struct df_insn_info *,
enum df_ref_flags);
static void df_uses_record (enum df_ref_class, struct df_collection_rec *,
rtx *, enum df_ref_type,
basic_block, struct df_insn_info *,
enum df_ref_flags,
int, int, enum machine_mode);
static df_ref df_ref_create_structure (enum df_ref_class,
struct df_collection_rec *, rtx, rtx *,
basic_block, struct df_insn_info *,
enum df_ref_type, enum df_ref_flags,
int, int, enum machine_mode);
static void df_insn_refs_collect (struct df_collection_rec*,
basic_block, struct df_insn_info *);
static void df_canonize_collection_rec (struct df_collection_rec *);
static void df_get_regular_block_artificial_uses (bitmap);
static void df_get_eh_block_artificial_uses (bitmap);
static void df_record_entry_block_defs (bitmap);
static void df_record_exit_block_uses (bitmap);
static void df_get_exit_block_use_set (bitmap);
static void df_get_entry_block_def_set (bitmap);
static void df_grow_ref_info (struct df_ref_info *, unsigned int);
static void df_ref_chain_delete_du_chain (df_ref *);
static void df_ref_chain_delete (df_ref *);
static void df_refs_add_to_chains (struct df_collection_rec *,
basic_block, rtx);
static bool df_insn_refs_verify (struct df_collection_rec *, basic_block, rtx, bool);
static void df_entry_block_defs_collect (struct df_collection_rec *, bitmap);
static void df_exit_block_uses_collect (struct df_collection_rec *, bitmap);
static void df_install_ref (df_ref, struct df_reg_info *,
struct df_ref_info *, bool);
static int df_ref_compare (const void *, const void *);
static int df_mw_compare (const void *, const void *);
/* Indexed by hardware reg number, is true if that register is ever
used in the current function.
In df-scan.c, this is set up to record the hard regs used
explicitly. Reload adds in the hard regs used for holding pseudo
regs. Final uses it to generate the code in the function prologue
and epilogue to save and restore registers as needed. */
static bool regs_ever_live[FIRST_PSEUDO_REGISTER];
/*----------------------------------------------------------------------------
SCANNING DATAFLOW PROBLEM
There are several ways in which scanning looks just like the other
dataflow problems. It shares the all the mechanisms for local info
as well as basic block info. Where it differs is when and how often
it gets run. It also has no need for the iterative solver.
----------------------------------------------------------------------------*/
/* Problem data for the scanning dataflow function. */
struct df_scan_problem_data
{
alloc_pool ref_base_pool;
alloc_pool ref_artificial_pool;
alloc_pool ref_regular_pool;
alloc_pool ref_extract_pool;
alloc_pool insn_pool;
alloc_pool reg_pool;
alloc_pool mw_reg_pool;
bitmap_obstack reg_bitmaps;
bitmap_obstack insn_bitmaps;
};
typedef struct df_scan_bb_info *df_scan_bb_info_t;
/* Internal function to shut down the scanning problem. */
static void
df_scan_free_internal (void)
{
struct df_scan_problem_data *problem_data
= (struct df_scan_problem_data *) df_scan->problem_data;
unsigned int i;
basic_block bb;
/* The vectors that hold the refs are not pool allocated because
they come in many sizes. This makes them impossible to delete
all at once. */
for (i = 0; i < DF_INSN_SIZE(); i++)
{
struct df_insn_info *insn_info = DF_INSN_UID_GET(i);
/* Skip the insns that have no insn_info or have been
deleted. */
if (insn_info)
{
df_scan_free_ref_vec (insn_info->defs);
df_scan_free_ref_vec (insn_info->uses);
df_scan_free_ref_vec (insn_info->eq_uses);
df_scan_free_mws_vec (insn_info->mw_hardregs);
}
}
FOR_ALL_BB (bb)
{
unsigned int bb_index = bb->index;
struct df_scan_bb_info *bb_info = df_scan_get_bb_info (bb_index);
if (bb_info)
{
df_scan_free_ref_vec (bb_info->artificial_defs);
df_scan_free_ref_vec (bb_info->artificial_uses);
}
}
free (df->def_info.refs);
free (df->def_info.begin);
free (df->def_info.count);
memset (&df->def_info, 0, (sizeof (struct df_ref_info)));
free (df->use_info.refs);
free (df->use_info.begin);
free (df->use_info.count);
memset (&df->use_info, 0, (sizeof (struct df_ref_info)));
free (df->def_regs);
df->def_regs = NULL;
free (df->use_regs);
df->use_regs = NULL;
free (df->eq_use_regs);
df->eq_use_regs = NULL;
df->regs_size = 0;
DF_REG_SIZE(df) = 0;
free (df->insns);
df->insns = NULL;
DF_INSN_SIZE () = 0;
free (df_scan->block_info);
df_scan->block_info = NULL;
df_scan->block_info_size = 0;
BITMAP_FREE (df->hardware_regs_used);
BITMAP_FREE (df->regular_block_artificial_uses);
BITMAP_FREE (df->eh_block_artificial_uses);
BITMAP_FREE (df->entry_block_defs);
BITMAP_FREE (df->exit_block_uses);
BITMAP_FREE (df->insns_to_delete);
BITMAP_FREE (df->insns_to_rescan);
BITMAP_FREE (df->insns_to_notes_rescan);
free_alloc_pool (df_scan->block_pool);
free_alloc_pool (problem_data->ref_base_pool);
free_alloc_pool (problem_data->ref_artificial_pool);
free_alloc_pool (problem_data->ref_regular_pool);
free_alloc_pool (problem_data->ref_extract_pool);
free_alloc_pool (problem_data->insn_pool);
free_alloc_pool (problem_data->reg_pool);
free_alloc_pool (problem_data->mw_reg_pool);
bitmap_obstack_release (&problem_data->reg_bitmaps);
bitmap_obstack_release (&problem_data->insn_bitmaps);
free (df_scan->problem_data);
}
/* Set basic block info. */
static void
df_scan_set_bb_info (unsigned int index,
struct df_scan_bb_info *bb_info)
{
gcc_assert (df_scan);
df_grow_bb_info (df_scan);
df_scan->block_info[index] = (void *) bb_info;
}
/* Free basic block info. */
static void
df_scan_free_bb_info (basic_block bb, void *vbb_info)
{
struct df_scan_bb_info *bb_info = (struct df_scan_bb_info *) vbb_info;
unsigned int bb_index = bb->index;
if (bb_info)
{
rtx insn;
FOR_BB_INSNS (bb, insn)
{
if (INSN_P (insn))
/* Record defs within INSN. */
df_insn_delete (bb, INSN_UID (insn));
}
if (bb_index < df_scan->block_info_size)
bb_info = df_scan_get_bb_info (bb_index);
/* Get rid of any artificial uses or defs. */
df_ref_chain_delete_du_chain (bb_info->artificial_defs);
df_ref_chain_delete_du_chain (bb_info->artificial_uses);
df_ref_chain_delete (bb_info->artificial_defs);
df_ref_chain_delete (bb_info->artificial_uses);
bb_info->artificial_defs = NULL;
bb_info->artificial_uses = NULL;
pool_free (df_scan->block_pool, bb_info);
}
}
/* Allocate the problem data for the scanning problem. This should be
called when the problem is created or when the entire function is to
be rescanned. */
void
df_scan_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
struct df_scan_problem_data *problem_data;
unsigned int insn_num = get_max_uid () + 1;
unsigned int block_size = 400;
basic_block bb;
/* Given the number of pools, this is really faster than tearing
everything apart. */
if (df_scan->problem_data)
df_scan_free_internal ();
df_scan->block_pool
= create_alloc_pool ("df_scan_block pool",
sizeof (struct df_scan_bb_info),
block_size);
problem_data = XNEW (struct df_scan_problem_data);
df_scan->problem_data = problem_data;
df_scan->computed = true;
problem_data->ref_base_pool
= create_alloc_pool ("df_scan ref base",
sizeof (struct df_base_ref), block_size);
problem_data->ref_artificial_pool
= create_alloc_pool ("df_scan ref artificial",
sizeof (struct df_artificial_ref), block_size);
problem_data->ref_regular_pool
= create_alloc_pool ("df_scan ref regular",
sizeof (struct df_regular_ref), block_size);
problem_data->ref_extract_pool
= create_alloc_pool ("df_scan ref extract",
sizeof (struct df_extract_ref), block_size);
problem_data->insn_pool
= create_alloc_pool ("df_scan insn",
sizeof (struct df_insn_info), block_size);
problem_data->reg_pool
= create_alloc_pool ("df_scan reg",
sizeof (struct df_reg_info), block_size);
problem_data->mw_reg_pool
= create_alloc_pool ("df_scan mw_reg",
sizeof (struct df_mw_hardreg), block_size);
bitmap_obstack_initialize (&problem_data->reg_bitmaps);
bitmap_obstack_initialize (&problem_data->insn_bitmaps);
insn_num += insn_num / 4;
df_grow_reg_info ();
df_grow_insn_info ();
df_grow_bb_info (df_scan);
FOR_ALL_BB (bb)
{
unsigned int bb_index = bb->index;
struct df_scan_bb_info *bb_info = df_scan_get_bb_info (bb_index);
if (!bb_info)
{
bb_info = (struct df_scan_bb_info *) pool_alloc (df_scan->block_pool);
df_scan_set_bb_info (bb_index, bb_info);
}
bb_info->artificial_defs = NULL;
bb_info->artificial_uses = NULL;
}
df->hardware_regs_used = BITMAP_ALLOC (&problem_data->reg_bitmaps);
df->regular_block_artificial_uses = BITMAP_ALLOC (&problem_data->reg_bitmaps);
df->eh_block_artificial_uses = BITMAP_ALLOC (&problem_data->reg_bitmaps);
df->entry_block_defs = BITMAP_ALLOC (&problem_data->reg_bitmaps);
df->exit_block_uses = BITMAP_ALLOC (&problem_data->reg_bitmaps);
df->insns_to_delete = BITMAP_ALLOC (&problem_data->insn_bitmaps);
df->insns_to_rescan = BITMAP_ALLOC (&problem_data->insn_bitmaps);
df->insns_to_notes_rescan = BITMAP_ALLOC (&problem_data->insn_bitmaps);
df_scan->optional_p = false;
}
/* Free all of the data associated with the scan problem. */
static void
df_scan_free (void)
{
if (df_scan->problem_data)
df_scan_free_internal ();
if (df->blocks_to_analyze)
{
BITMAP_FREE (df->blocks_to_analyze);
df->blocks_to_analyze = NULL;
}
free (df_scan);
}
/* Dump the preamble for DF_SCAN dump. */
static void
df_scan_start_dump (FILE *file ATTRIBUTE_UNUSED)
{
int i;
int dcount = 0;
int ucount = 0;
int ecount = 0;
int icount = 0;
int ccount = 0;
basic_block bb;
rtx insn;
fprintf (file, ";; invalidated by call \t");
df_print_regset (file, regs_invalidated_by_call_regset);
fprintf (file, ";; hardware regs used \t");
df_print_regset (file, df->hardware_regs_used);
fprintf (file, ";; regular block artificial uses \t");
df_print_regset (file, df->regular_block_artificial_uses);
fprintf (file, ";; eh block artificial uses \t");
df_print_regset (file, df->eh_block_artificial_uses);
fprintf (file, ";; entry block defs \t");
df_print_regset (file, df->entry_block_defs);
fprintf (file, ";; exit block uses \t");
df_print_regset (file, df->exit_block_uses);
fprintf (file, ";; regs ever live \t");
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (df_regs_ever_live_p (i))
fprintf (file, " %d[%s]", i, reg_names[i]);
fprintf (file, "\n;; ref usage \t");
for (i = 0; i < (int)df->regs_inited; i++)
if (DF_REG_DEF_COUNT (i) || DF_REG_USE_COUNT (i) || DF_REG_EQ_USE_COUNT (i))
{
const char * sep = "";
fprintf (file, "r%d={", i);
if (DF_REG_DEF_COUNT (i))
{
fprintf (file, "%dd", DF_REG_DEF_COUNT (i));
sep = ",";
dcount += DF_REG_DEF_COUNT (i);
}
if (DF_REG_USE_COUNT (i))
{
fprintf (file, "%s%du", sep, DF_REG_USE_COUNT (i));
sep = ",";
ucount += DF_REG_USE_COUNT (i);
}
if (DF_REG_EQ_USE_COUNT (i))
{
fprintf (file, "%s%dd", sep, DF_REG_EQ_USE_COUNT (i));
ecount += DF_REG_EQ_USE_COUNT (i);
}
fprintf (file, "} ");
}
FOR_EACH_BB (bb)
FOR_BB_INSNS (bb, insn)
if (INSN_P (insn))
{
if (CALL_P (insn))
ccount++;
else
icount++;
}
fprintf (file, "\n;; total ref usage %d{%dd,%du,%de} in %d{%d regular + %d call} insns.\n",
dcount + ucount + ecount, dcount, ucount, ecount, icount + ccount, icount, ccount);
}
/* Dump the bb_info for a given basic block. */
static void
df_scan_start_block (basic_block bb, FILE *file)
{
struct df_scan_bb_info *bb_info
= df_scan_get_bb_info (bb->index);
if (bb_info)
{
fprintf (file, ";; bb %d artificial_defs: ", bb->index);
df_refs_chain_dump (bb_info->artificial_defs, true, file);
fprintf (file, "\n;; bb %d artificial_uses: ", bb->index);
df_refs_chain_dump (bb_info->artificial_uses, true, file);
fprintf (file, "\n");
}
#if 0
{
rtx insn;
FOR_BB_INSNS (bb, insn)
if (INSN_P (insn))
df_insn_debug (insn, false, file);
}
#endif
}
static struct df_problem problem_SCAN =
{
DF_SCAN, /* Problem id. */
DF_NONE, /* Direction. */
df_scan_alloc, /* Allocate the problem specific data. */
NULL, /* Reset global information. */
df_scan_free_bb_info, /* Free basic block info. */
NULL, /* Local compute function. */
NULL, /* Init the solution specific data. */
NULL, /* Iterative solver. */
NULL, /* Confluence operator 0. */
NULL, /* Confluence operator n. */
NULL, /* Transfer function. */
NULL, /* Finalize function. */
df_scan_free, /* Free all of the problem information. */
NULL, /* Remove this problem from the stack of dataflow problems. */
df_scan_start_dump, /* Debugging. */
df_scan_start_block, /* Debugging start block. */
NULL, /* Debugging end block. */
NULL, /* Incremental solution verify start. */
NULL, /* Incremental solution verify end. */
NULL, /* Dependent problem. */
TV_DF_SCAN, /* Timing variable. */
false /* Reset blocks on dropping out of blocks_to_analyze. */
};
/* Create a new DATAFLOW instance and add it to an existing instance
of DF. The returned structure is what is used to get at the
solution. */
void
df_scan_add_problem (void)
{
df_add_problem (&problem_SCAN);
}
/*----------------------------------------------------------------------------
Storage Allocation Utilities
----------------------------------------------------------------------------*/
/* First, grow the reg_info information. If the current size is less than
the number of pseudos, grow to 25% more than the number of
pseudos.
Second, assure that all of the slots up to max_reg_num have been
filled with reg_info structures. */
void
df_grow_reg_info (void)
{
unsigned int max_reg = max_reg_num ();
unsigned int new_size = max_reg;
struct df_scan_problem_data *problem_data
= (struct df_scan_problem_data *) df_scan->problem_data;
unsigned int i;
if (df->regs_size < new_size)
{
new_size += new_size / 4;
df->def_regs = XRESIZEVEC (struct df_reg_info *, df->def_regs, new_size);
df->use_regs = XRESIZEVEC (struct df_reg_info *, df->use_regs, new_size);
df->eq_use_regs = XRESIZEVEC (struct df_reg_info *, df->eq_use_regs,
new_size);
df->def_info.begin = XRESIZEVEC (unsigned, df->def_info.begin, new_size);
df->def_info.count = XRESIZEVEC (unsigned, df->def_info.count, new_size);
df->use_info.begin = XRESIZEVEC (unsigned, df->use_info.begin, new_size);
df->use_info.count = XRESIZEVEC (unsigned, df->use_info.count, new_size);
df->regs_size = new_size;
}
for (i = df->regs_inited; i < max_reg; i++)
{
struct df_reg_info *reg_info;
reg_info = (struct df_reg_info *) pool_alloc (problem_data->reg_pool);
memset (reg_info, 0, sizeof (struct df_reg_info));
df->def_regs[i] = reg_info;
reg_info = (struct df_reg_info *) pool_alloc (problem_data->reg_pool);
memset (reg_info, 0, sizeof (struct df_reg_info));
df->use_regs[i] = reg_info;
reg_info = (struct df_reg_info *) pool_alloc (problem_data->reg_pool);
memset (reg_info, 0, sizeof (struct df_reg_info));
df->eq_use_regs[i] = reg_info;
df->def_info.begin[i] = 0;
df->def_info.count[i] = 0;
df->use_info.begin[i] = 0;
df->use_info.count[i] = 0;
}
df->regs_inited = max_reg;
}
/* Grow the ref information. */
static void
df_grow_ref_info (struct df_ref_info *ref_info, unsigned int new_size)
{
if (ref_info->refs_size < new_size)
{
ref_info->refs = XRESIZEVEC (df_ref, ref_info->refs, new_size);
memset (ref_info->refs + ref_info->refs_size, 0,
(new_size - ref_info->refs_size) *sizeof (df_ref));
ref_info->refs_size = new_size;
}
}
/* Check and grow the ref information if necessary. This routine
guarantees total_size + BITMAP_ADDEND amount of entries in refs
array. It updates ref_info->refs_size only and does not change
ref_info->total_size. */
static void
df_check_and_grow_ref_info (struct df_ref_info *ref_info,
unsigned bitmap_addend)
{
if (ref_info->refs_size < ref_info->total_size + bitmap_addend)
{
int new_size = ref_info->total_size + bitmap_addend;
new_size += ref_info->total_size / 4;
df_grow_ref_info (ref_info, new_size);
}
}
/* Grow the ref information. If the current size is less than the
number of instructions, grow to 25% more than the number of
instructions. */
void
df_grow_insn_info (void)
{
unsigned int new_size = get_max_uid () + 1;
if (DF_INSN_SIZE () < new_size)
{
new_size += new_size / 4;
df->insns = XRESIZEVEC (struct df_insn_info *, df->insns, new_size);
memset (df->insns + df->insns_size, 0,
(new_size - DF_INSN_SIZE ()) *sizeof (struct df_insn_info *));
DF_INSN_SIZE () = new_size;
}
}
/*----------------------------------------------------------------------------
PUBLIC INTERFACES FOR SMALL GRAIN CHANGES TO SCANNING.
----------------------------------------------------------------------------*/
/* Rescan all of the block_to_analyze or all of the blocks in the
function if df_set_blocks if blocks_to_analyze is NULL; */
void
df_scan_blocks (void)
{
basic_block bb;
df->def_info.ref_order = DF_REF_ORDER_NO_TABLE;
df->use_info.ref_order = DF_REF_ORDER_NO_TABLE;
df_get_regular_block_artificial_uses (df->regular_block_artificial_uses);
df_get_eh_block_artificial_uses (df->eh_block_artificial_uses);
bitmap_ior_into (df->eh_block_artificial_uses,
df->regular_block_artificial_uses);
/* ENTRY and EXIT blocks have special defs/uses. */
df_get_entry_block_def_set (df->entry_block_defs);
df_record_entry_block_defs (df->entry_block_defs);
df_get_exit_block_use_set (df->exit_block_uses);
df_record_exit_block_uses (df->exit_block_uses);
df_set_bb_dirty (BASIC_BLOCK (ENTRY_BLOCK));
df_set_bb_dirty (BASIC_BLOCK (EXIT_BLOCK));
/* Regular blocks */
FOR_EACH_BB (bb)
{
unsigned int bb_index = bb->index;
df_bb_refs_record (bb_index, true);
}
}
/* Create a new ref of type DF_REF_TYPE for register REG at address
LOC within INSN of BB. This function is only used externally.
If the REF_FLAGS field contain DF_REF_SIGN_EXTRACT or
DF_REF_ZERO_EXTRACT. WIDTH, OFFSET and MODE are used to access the
fields if they were constants. Otherwise they should be -1 if
those flags were set. */
df_ref
df_ref_create (rtx reg, rtx *loc, rtx insn,
basic_block bb,
enum df_ref_type ref_type,
enum df_ref_flags ref_flags,
int width, int offset, enum machine_mode mode)
{
df_ref ref;
struct df_reg_info **reg_info;
struct df_ref_info *ref_info;
df_ref *ref_rec;
df_ref **ref_rec_ptr;
unsigned int count = 0;
bool add_to_table;
enum df_ref_class cl;
df_grow_reg_info ();
/* You cannot hack artificial refs. */
gcc_assert (insn);
if (width != -1 || offset != -1)
cl = DF_REF_EXTRACT;
else if (loc)
cl = DF_REF_REGULAR;
else
cl = DF_REF_BASE;
ref = df_ref_create_structure (cl, NULL, reg, loc, bb, DF_INSN_INFO_GET (insn),
ref_type, ref_flags,
width, offset, mode);
if (DF_REF_REG_DEF_P (ref))
{
reg_info = df->def_regs;
ref_info = &df->def_info;
ref_rec_ptr = &DF_INSN_DEFS (insn);
add_to_table = ref_info->ref_order != DF_REF_ORDER_NO_TABLE;
}
else if (DF_REF_FLAGS (ref) & DF_REF_IN_NOTE)
{
reg_info = df->eq_use_regs;
ref_info = &df->use_info;
ref_rec_ptr = &DF_INSN_EQ_USES (insn);
switch (ref_info->ref_order)
{
case DF_REF_ORDER_UNORDERED_WITH_NOTES:
case DF_REF_ORDER_BY_REG_WITH_NOTES:
case DF_REF_ORDER_BY_INSN_WITH_NOTES:
add_to_table = true;
break;
default:
add_to_table = false;
break;
}
}
else
{
reg_info = df->use_regs;
ref_info = &df->use_info;
ref_rec_ptr = &DF_INSN_USES (insn);
add_to_table = ref_info->ref_order != DF_REF_ORDER_NO_TABLE;
}
/* Do not add if ref is not in the right blocks. */
if (add_to_table && df->analyze_subset)
add_to_table = bitmap_bit_p (df->blocks_to_analyze, bb->index);
df_install_ref (ref, reg_info[DF_REF_REGNO (ref)], ref_info, add_to_table);
if (add_to_table)
switch (ref_info->ref_order)
{
case DF_REF_ORDER_UNORDERED_WITH_NOTES:
case DF_REF_ORDER_BY_REG_WITH_NOTES:
case DF_REF_ORDER_BY_INSN_WITH_NOTES:
ref_info->ref_order = DF_REF_ORDER_UNORDERED_WITH_NOTES;
break;
default:
ref_info->ref_order = DF_REF_ORDER_UNORDERED;
break;
}
ref_rec = *ref_rec_ptr;
while (*ref_rec)
{
count++;
ref_rec++;
}
ref_rec = *ref_rec_ptr;
if (count)
{
ref_rec = XRESIZEVEC (df_ref, ref_rec, count+2);
*ref_rec_ptr = ref_rec;
ref_rec[count] = ref;
ref_rec[count+1] = NULL;
qsort (ref_rec, count + 1, sizeof (df_ref), df_ref_compare);
}
else
{
df_ref *ref_rec = XNEWVEC (df_ref, 2);
ref_rec[0] = ref;
ref_rec[1] = NULL;
*ref_rec_ptr = ref_rec;
}
#if 0
if (dump_file)
{
fprintf (dump_file, "adding ref ");
df_ref_debug (ref, dump_file);
}
#endif
/* By adding the ref directly, df_insn_rescan my not find any
differences even though the block will have changed. So we need
to mark the block dirty ourselves. */
df_set_bb_dirty (bb);
return ref;
}
/*----------------------------------------------------------------------------
UTILITIES TO CREATE AND DESTROY REFS AND CHAINS.
----------------------------------------------------------------------------*/
static void
df_free_ref (df_ref ref)
{
struct df_scan_problem_data *problem_data
= (struct df_scan_problem_data *) df_scan->problem_data;
switch (DF_REF_CLASS (ref))
{
case DF_REF_BASE:
pool_free (problem_data->ref_base_pool, ref);
break;
case DF_REF_ARTIFICIAL:
pool_free (problem_data->ref_artificial_pool, ref);
break;
case DF_REF_REGULAR:
pool_free (problem_data->ref_regular_pool, ref);
break;
case DF_REF_EXTRACT:
pool_free (problem_data->ref_extract_pool, ref);
break;
}
}
/* Unlink and delete REF at the reg_use, reg_eq_use or reg_def chain.
Also delete the def-use or use-def chain if it exists. */
static void
df_reg_chain_unlink (df_ref ref)
{
df_ref next = DF_REF_NEXT_REG (ref);
df_ref prev = DF_REF_PREV_REG (ref);
int id = DF_REF_ID (ref);
struct df_reg_info *reg_info;
df_ref *refs = NULL;
if (DF_REF_REG_DEF_P (ref))
{
int regno = DF_REF_REGNO (ref);
reg_info = DF_REG_DEF_GET (regno);
refs = df->def_info.refs;
}
else
{
if (DF_REF_FLAGS (ref) & DF_REF_IN_NOTE)
{
reg_info = DF_REG_EQ_USE_GET (DF_REF_REGNO (ref));
switch (df->use_info.ref_order)
{
case DF_REF_ORDER_UNORDERED_WITH_NOTES:
case DF_REF_ORDER_BY_REG_WITH_NOTES:
case DF_REF_ORDER_BY_INSN_WITH_NOTES:
refs = df->use_info.refs;
break;
default:
break;
}
}
else
{
reg_info = DF_REG_USE_GET (DF_REF_REGNO (ref));
refs = df->use_info.refs;
}
}
if (refs)
{
if (df->analyze_subset)
{
if (bitmap_bit_p (df->blocks_to_analyze, DF_REF_BBNO (ref)))
refs[id] = NULL;
}
else
refs[id] = NULL;
}
/* Delete any def-use or use-def chains that start here. It is
possible that there is trash in this field. This happens for
insns that have been deleted when rescanning has been deferred
and the chain problem has also been deleted. The chain tear down
code skips deleted insns. */
if (df_chain && DF_REF_CHAIN (ref))
df_chain_unlink (ref);
reg_info->n_refs--;
if (DF_REF_FLAGS_IS_SET (ref, DF_HARD_REG_LIVE))
{
gcc_assert (DF_REF_REGNO (ref) < FIRST_PSEUDO_REGISTER);
df->hard_regs_live_count[DF_REF_REGNO (ref)]--;
}
/* Unlink from the reg chain. If there is no prev, this is the
first of the list. If not, just join the next and prev. */
if (prev)
DF_REF_NEXT_REG (prev) = next;
else
{
gcc_assert (reg_info->reg_chain == ref);
reg_info->reg_chain = next;
}
if (next)
DF_REF_PREV_REG (next) = prev;
df_free_ref (ref);
}
/* Remove REF from VEC. */
static void
df_ref_compress_rec (df_ref **vec_ptr, df_ref ref)
{
df_ref *vec = *vec_ptr;
if (vec[1])
{
while (*vec && *vec != ref)
vec++;
while (*vec)
{
*vec = *(vec+1);
vec++;
}
}
else
{
free (vec);
*vec_ptr = df_null_ref_rec;
}
}
/* Unlink REF from all def-use/use-def chains, etc. */
void
df_ref_remove (df_ref ref)
{
#if 0
if (dump_file)
{
fprintf (dump_file, "removing ref ");
df_ref_debug (ref, dump_file);
}
#endif
if (DF_REF_REG_DEF_P (ref))
{
if (DF_REF_IS_ARTIFICIAL (ref))
{
struct df_scan_bb_info *bb_info
= df_scan_get_bb_info (DF_REF_BBNO (ref));
df_ref_compress_rec (&bb_info->artificial_defs, ref);
}
else
{
unsigned int uid = DF_REF_INSN_UID (ref);
struct df_insn_info *insn_rec = DF_INSN_UID_GET (uid);
df_ref_compress_rec (&insn_rec->defs, ref);
}
}
else
{
if (DF_REF_IS_ARTIFICIAL (ref))