#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "rtl.h"
#include "hard-reg-set.h"
#include "basic-block.h"
#include "regs.h"
#include "flags.h"
#include "output.h"
#include "function.h"
#include "except.h"
#include "toplev.h"
#include "tm_p.h"
#include "obstack.h"
#include "alloc-pool.h"
#include "timevar.h"
#include "ggc.h"
struct obstack flow_obstack;
static char *flow_firstobj;
int n_basic_blocks;
int last_basic_block;
int n_edges;
varray_type basic_block_info;
basic_block ENTRY_BLOCK_PTR, EXIT_BLOCK_PTR;
alloc_pool rbi_pool;
void debug_flow_info (void);
static void free_edge (edge);
void
init_flow (void)
{
static int initialized;
n_edges = 0;
if (!initialized)
{
gcc_obstack_init (&flow_obstack);
flow_firstobj = obstack_alloc (&flow_obstack, 0);
initialized = 1;
}
else
{
obstack_free (&flow_obstack, flow_firstobj);
flow_firstobj = obstack_alloc (&flow_obstack, 0);
}
ENTRY_BLOCK_PTR = ggc_alloc_cleared (sizeof (*ENTRY_BLOCK_PTR));
ENTRY_BLOCK_PTR->index = ENTRY_BLOCK;
EXIT_BLOCK_PTR = ggc_alloc_cleared (sizeof (*EXIT_BLOCK_PTR));
EXIT_BLOCK_PTR->index = EXIT_BLOCK;
ENTRY_BLOCK_PTR->next_bb = EXIT_BLOCK_PTR;
EXIT_BLOCK_PTR->prev_bb = ENTRY_BLOCK_PTR;
}
static void
free_edge (edge e ATTRIBUTE_UNUSED)
{
n_edges--;
}
void
clear_edges (void)
{
basic_block bb;
edge e;
FOR_EACH_BB (bb)
{
edge e = bb->succ;
while (e)
{
edge next = e->succ_next;
free_edge (e);
e = next;
}
bb->succ = NULL;
bb->pred = NULL;
}
e = ENTRY_BLOCK_PTR->succ;
while (e)
{
edge next = e->succ_next;
free_edge (e);
e = next;
}
EXIT_BLOCK_PTR->pred = NULL;
ENTRY_BLOCK_PTR->succ = NULL;
if (n_edges)
abort ();
}
basic_block
alloc_block (void)
{
basic_block bb;
bb = ggc_alloc_cleared (sizeof (*bb));
return bb;
}
void
alloc_rbi_pool (void)
{
rbi_pool = create_alloc_pool ("rbi pool",
sizeof (struct reorder_block_def),
n_basic_blocks + 2);
}
void
free_rbi_pool (void)
{
free_alloc_pool (rbi_pool);
}
void
initialize_bb_rbi (basic_block bb)
{
if (bb->rbi)
abort ();
bb->rbi = pool_alloc (rbi_pool);
memset (bb->rbi, 0, sizeof (struct reorder_block_def));
}
void
link_block (basic_block b, basic_block after)
{
b->next_bb = after->next_bb;
b->prev_bb = after;
after->next_bb = b;
b->next_bb->prev_bb = b;
}
void
unlink_block (basic_block b)
{
b->next_bb->prev_bb = b->prev_bb;
b->prev_bb->next_bb = b->next_bb;
b->prev_bb = NULL;
b->next_bb = NULL;
}
void
compact_blocks (void)
{
int i;
basic_block bb;
i = 0;
FOR_EACH_BB (bb)
{
BASIC_BLOCK (i) = bb;
bb->index = i;
i++;
}
if (i != n_basic_blocks)
abort ();
for (; i < last_basic_block; i++)
BASIC_BLOCK (i) = NULL;
last_basic_block = n_basic_blocks;
}
void
expunge_block (basic_block b)
{
unlink_block (b);
BASIC_BLOCK (b->index) = NULL;
n_basic_blocks--;
}
edge
unchecked_make_edge (basic_block src, basic_block dst, int flags)
{
edge e;
e = ggc_alloc_cleared (sizeof (*e));
n_edges++;
e->succ_next = src->succ;
e->pred_next = dst->pred;
e->src = src;
e->dest = dst;
e->flags = flags;
src->succ = e;
dst->pred = e;
return e;
}
edge
cached_make_edge (sbitmap *edge_cache, basic_block src, basic_block dst, int flags)
{
int use_edge_cache;
edge e;
use_edge_cache = (edge_cache
&& src != ENTRY_BLOCK_PTR && dst != EXIT_BLOCK_PTR);
switch (use_edge_cache)
{
default:
if (! TEST_BIT (edge_cache[src->index], dst->index))
break;
if (flags == 0)
return NULL;
case 0:
for (e = src->succ; e; e = e->succ_next)
if (e->dest == dst)
{
e->flags |= flags;
return NULL;
}
break;
}
e = unchecked_make_edge (src, dst, flags);
if (use_edge_cache)
SET_BIT (edge_cache[src->index], dst->index);
return e;
}
edge
make_edge (basic_block src, basic_block dest, int flags)
{
return cached_make_edge (NULL, src, dest, flags);
}
edge
make_single_succ_edge (basic_block src, basic_block dest, int flags)
{
edge e = make_edge (src, dest, flags);
e->probability = REG_BR_PROB_BASE;
e->count = src->count;
return e;
}
void
remove_edge (edge e)
{
edge last_pred = NULL;
edge last_succ = NULL;
edge tmp;
basic_block src, dest;
src = e->src;
dest = e->dest;
for (tmp = src->succ; tmp && tmp != e; tmp = tmp->succ_next)
last_succ = tmp;
if (!tmp)
abort ();
if (last_succ)
last_succ->succ_next = e->succ_next;
else
src->succ = e->succ_next;
for (tmp = dest->pred; tmp && tmp != e; tmp = tmp->pred_next)
last_pred = tmp;
if (!tmp)
abort ();
if (last_pred)
last_pred->pred_next = e->pred_next;
else
dest->pred = e->pred_next;
free_edge (e);
}
void
redirect_edge_succ (edge e, basic_block new_succ)
{
edge *pe;
for (pe = &e->dest->pred; *pe != e; pe = &(*pe)->pred_next)
continue;
*pe = (*pe)->pred_next;
e->pred_next = new_succ->pred;
new_succ->pred = e;
e->dest = new_succ;
}
edge
redirect_edge_succ_nodup (edge e, basic_block new_succ)
{
edge s;
for (s = e->src->succ; s; s = s->succ_next)
if (s->dest == new_succ && s != e)
break;
if (s)
{
s->flags |= e->flags;
s->probability += e->probability;
if (s->probability > REG_BR_PROB_BASE)
s->probability = REG_BR_PROB_BASE;
s->count += e->count;
remove_edge (e);
e = s;
}
else
redirect_edge_succ (e, new_succ);
return e;
}
void
redirect_edge_pred (edge e, basic_block new_pred)
{
edge *pe;
for (pe = &e->src->succ; *pe != e; pe = &(*pe)->succ_next)
continue;
*pe = (*pe)->succ_next;
e->succ_next = new_pred->succ;
new_pred->succ = e;
e->src = new_pred;
}
void
clear_bb_flags (void)
{
basic_block bb;
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
bb->flags = 0;
}
void
dump_flow_info (FILE *file)
{
int i;
basic_block bb;
static const char * const reg_class_names[] = REG_CLASS_NAMES;
if (reg_n_info)
{
int max_regno = max_reg_num ();
fprintf (file, "%d registers.\n", max_regno);
for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
if (REG_N_REFS (i))
{
enum reg_class class, altclass;
fprintf (file, "\nRegister %d used %d times across %d insns",
i, REG_N_REFS (i), REG_LIVE_LENGTH (i));
if (REG_BASIC_BLOCK (i) >= 0)
fprintf (file, " in block %d", REG_BASIC_BLOCK (i));
if (REG_N_SETS (i))
fprintf (file, "; set %d time%s", REG_N_SETS (i),
(REG_N_SETS (i) == 1) ? "" : "s");
if (regno_reg_rtx[i] != NULL && REG_USERVAR_P (regno_reg_rtx[i]))
fprintf (file, "; user var");
if (REG_N_DEATHS (i) != 1)
fprintf (file, "; dies in %d places", REG_N_DEATHS (i));
if (REG_N_CALLS_CROSSED (i) == 1)
fprintf (file, "; crosses 1 call");
else if (REG_N_CALLS_CROSSED (i))
fprintf (file, "; crosses %d calls", REG_N_CALLS_CROSSED (i));
if (regno_reg_rtx[i] != NULL
&& PSEUDO_REGNO_BYTES (i) != UNITS_PER_WORD)
fprintf (file, "; %d bytes", PSEUDO_REGNO_BYTES (i));
class = reg_preferred_class (i);
altclass = reg_alternate_class (i);
if (class != GENERAL_REGS || altclass != ALL_REGS)
{
if (altclass == ALL_REGS || class == ALL_REGS)
fprintf (file, "; pref %s", reg_class_names[(int) class]);
else if (altclass == NO_REGS)
fprintf (file, "; %s or none", reg_class_names[(int) class]);
else
fprintf (file, "; pref %s, else %s",
reg_class_names[(int) class],
reg_class_names[(int) altclass]);
}
if (regno_reg_rtx[i] != NULL && REG_POINTER (regno_reg_rtx[i]))
fprintf (file, "; pointer");
fprintf (file, ".\n");
}
}
fprintf (file, "\n%d basic blocks, %d edges.\n", n_basic_blocks, n_edges);
FOR_EACH_BB (bb)
{
edge e;
int sum;
gcov_type lsum;
fprintf (file, "\nBasic block %d ", bb->index);
fprintf (file, "prev %d, next %d, ",
bb->prev_bb->index, bb->next_bb->index);
fprintf (file, "loop_depth %d, count ", bb->loop_depth);
fprintf (file, HOST_WIDEST_INT_PRINT_DEC, bb->count);
fprintf (file, ", freq %i", bb->frequency);
if (maybe_hot_bb_p (bb))
fprintf (file, ", maybe hot");
if (probably_never_executed_bb_p (bb))
fprintf (file, ", probably never executed");
fprintf (file, ".\n");
fprintf (file, "Predecessors: ");
for (e = bb->pred; e; e = e->pred_next)
dump_edge_info (file, e, 0);
fprintf (file, "\nSuccessors: ");
for (e = bb->succ; e; e = e->succ_next)
dump_edge_info (file, e, 1);
fprintf (file, "\nRegisters live at start:");
dump_regset (bb->global_live_at_start, file);
fprintf (file, "\nRegisters live at end:");
dump_regset (bb->global_live_at_end, file);
putc ('\n', file);
sum = 0;
for (e = bb->succ; e; e = e->succ_next)
sum += e->probability;
if (bb->succ && abs (sum - REG_BR_PROB_BASE) > 100)
fprintf (file, "Invalid sum of outgoing probabilities %.1f%%\n",
sum * 100.0 / REG_BR_PROB_BASE);
sum = 0;
for (e = bb->pred; e; e = e->pred_next)
sum += EDGE_FREQUENCY (e);
if (abs (sum - bb->frequency) > 100)
fprintf (file,
"Invalid sum of incomming frequencies %i, should be %i\n",
sum, bb->frequency);
lsum = 0;
for (e = bb->pred; e; e = e->pred_next)
lsum += e->count;
if (lsum - bb->count > 100 || lsum - bb->count < -100)
fprintf (file, "Invalid sum of incomming counts %i, should be %i\n",
(int)lsum, (int)bb->count);
lsum = 0;
for (e = bb->succ; e; e = e->succ_next)
lsum += e->count;
if (bb->succ && (lsum - bb->count > 100 || lsum - bb->count < -100))
fprintf (file, "Invalid sum of incomming counts %i, should be %i\n",
(int)lsum, (int)bb->count);
}
putc ('\n', file);
}
void
debug_flow_info (void)
{
dump_flow_info (stderr);
}
void
dump_edge_info (FILE *file, edge e, int do_succ)
{
basic_block side = (do_succ ? e->dest : e->src);
if (side == ENTRY_BLOCK_PTR)
fputs (" ENTRY", file);
else if (side == EXIT_BLOCK_PTR)
fputs (" EXIT", file);
else
fprintf (file, " %d", side->index);
if (e->probability)
fprintf (file, " [%.1f%%] ", e->probability * 100.0 / REG_BR_PROB_BASE);
if (e->count)
{
fprintf (file, " count:");
fprintf (file, HOST_WIDEST_INT_PRINT_DEC, e->count);
}
if (e->flags)
{
static const char * const bitnames[] = {
"fallthru", "ab", "abcall", "eh", "fake", "dfs_back",
"can_fallthru", "irreducible", "sibcall", "loop_exit",
"true", "false", "exec"
};
int comma = 0;
int i, flags = e->flags;
fputs (" (", file);
for (i = 0; flags; i++)
if (flags & (1 << i))
{
flags &= ~(1 << i);
if (comma)
fputc (',', file);
if (i < (int) ARRAY_SIZE (bitnames))
fputs (bitnames[i], file);
else
fprintf (file, "%d", i);
comma = 1;
}
fputc (')', file);
}
}
static struct obstack block_aux_obstack;
static void *first_block_aux_obj = 0;
static struct obstack edge_aux_obstack;
static void *first_edge_aux_obj = 0;
inline void
alloc_aux_for_block (basic_block bb, int size)
{
if (bb->aux || !first_block_aux_obj)
abort ();
bb->aux = obstack_alloc (&block_aux_obstack, size);
memset (bb->aux, 0, size);
}
void
alloc_aux_for_blocks (int size)
{
static int initialized;
if (!initialized)
{
gcc_obstack_init (&block_aux_obstack);
initialized = 1;
}
else if (first_block_aux_obj)
abort ();
first_block_aux_obj = obstack_alloc (&block_aux_obstack, 0);
if (size)
{
basic_block bb;
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
alloc_aux_for_block (bb, size);
}
}
void
clear_aux_for_blocks (void)
{
basic_block bb;
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
bb->aux = NULL;
}
void
free_aux_for_blocks (void)
{
if (!first_block_aux_obj)
abort ();
obstack_free (&block_aux_obstack, first_block_aux_obj);
first_block_aux_obj = NULL;
clear_aux_for_blocks ();
}
inline void
alloc_aux_for_edge (edge e, int size)
{
if (e->aux || !first_edge_aux_obj)
abort ();
e->aux = obstack_alloc (&edge_aux_obstack, size);
memset (e->aux, 0, size);
}
void
alloc_aux_for_edges (int size)
{
static int initialized;
if (!initialized)
{
gcc_obstack_init (&edge_aux_obstack);
initialized = 1;
}
else if (first_edge_aux_obj)
abort ();
first_edge_aux_obj = obstack_alloc (&edge_aux_obstack, 0);
if (size)
{
basic_block bb;
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, EXIT_BLOCK_PTR, next_bb)
{
edge e;
for (e = bb->succ; e; e = e->succ_next)
alloc_aux_for_edge (e, size);
}
}
}
void
clear_aux_for_edges (void)
{
basic_block bb;
edge e;
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, EXIT_BLOCK_PTR, next_bb)
{
for (e = bb->succ; e; e = e->succ_next)
e->aux = NULL;
}
}
void
free_aux_for_edges (void)
{
if (!first_edge_aux_obj)
abort ();
obstack_free (&edge_aux_obstack, first_edge_aux_obj);
first_edge_aux_obj = NULL;
clear_aux_for_edges ();
}
void
debug_bb (basic_block bb)
{
dump_bb (bb, stderr, 0);
}
basic_block
debug_bb_n (int n)
{
basic_block bb = BASIC_BLOCK (n);
dump_bb (bb, stderr, 0);
return bb;
}
static void
dump_cfg_bb_info (FILE *file, basic_block bb)
{
unsigned i;
bool first = true;
static const char * const bb_bitnames[] =
{
"dirty", "new", "reachable", "visited", "irreducible_loop", "superblock"
};
const unsigned n_bitnames = sizeof (bb_bitnames) / sizeof (char *);
edge e;
fprintf (file, "Basic block %d", bb->index);
for (i = 0; i < n_bitnames; i++)
if (bb->flags & (1 << i))
{
if (first)
fprintf (file, " (");
else
fprintf (file, ", ");
first = false;
fprintf (file, bb_bitnames[i]);
}
if (!first)
fprintf (file, ")");
fprintf (file, "\n");
fprintf (file, "Predecessors: ");
for (e = bb->pred; e; e = e->pred_next)
dump_edge_info (file, e, 0);
fprintf (file, "\nSuccessors: ");
for (e = bb->succ; e; e = e->succ_next)
dump_edge_info (file, e, 1);
fprintf (file, "\n\n");
}
void
brief_dump_cfg (FILE *file)
{
basic_block bb;
FOR_EACH_BB (bb)
{
dump_cfg_bb_info (file, bb);
}
}