/* Control flow graph manipulation code for GNU compiler.
Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005
+ Free Software Foundation, Inc.
This file is part of GCC.
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, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
/* This file contains low level functions to manipulate the CFG and
analyze it. All other modules should not transform the data structure
#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 "toplev.h"
#include "tm_p.h"
#include "obstack.h"
-#include "alloc-pool.h"
#include "timevar.h"
+#include "tree-pass.h"
#include "ggc.h"
+#include "hashtab.h"
+#include "alloc-pool.h"
/* The obstack on which the flow graph components are allocated. */
-struct obstack flow_obstack;
-static char *flow_firstobj;
-
-/* Number of basic blocks in the current function. */
-
-int n_basic_blocks;
-
-/* First free basic block number. */
-
-int last_basic_block;
-
-/* Number of edges in the current function. */
-
-int n_edges;
-
-/* The basic block array. */
-
-varray_type basic_block_info;
-
-/* The special entry and exit blocks. */
-basic_block ENTRY_BLOCK_PTR, EXIT_BLOCK_PTR;
-
-/* Memory alloc pool for bb member rbi. */
-alloc_pool rbi_pool;
+struct bitmap_obstack reg_obstack;
void debug_flow_info (void);
static void free_edge (edge);
-
-/* Indicate the presence of the profile. */
-enum profile_status profile_status;
\f
+#define RDIV(X,Y) (((X) + (Y) / 2) / (Y))
+
/* Called once at initialization time. */
void
init_flow (void)
{
- static int initialized;
-
+ if (!cfun->cfg)
+ cfun->cfg = ggc_alloc_cleared (sizeof (struct control_flow_graph));
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 = ggc_alloc_cleared (sizeof (struct basic_block_def));
ENTRY_BLOCK_PTR->index = ENTRY_BLOCK;
- EXIT_BLOCK_PTR = ggc_alloc_cleared (sizeof (*EXIT_BLOCK_PTR));
+ EXIT_BLOCK_PTR = ggc_alloc_cleared (sizeof (struct basic_block_def));
EXIT_BLOCK_PTR->index = EXIT_BLOCK;
ENTRY_BLOCK_PTR->next_bb = EXIT_BLOCK_PTR;
EXIT_BLOCK_PTR->prev_bb = ENTRY_BLOCK_PTR;
return bb;
}
-/* Create memory pool for rbi_pool. */
-
-void
-alloc_rbi_pool (void)
-{
- rbi_pool = create_alloc_pool ("rbi pool",
- sizeof (struct reorder_block_def),
- n_basic_blocks + 2);
-}
-
-/* Free rbi_pool. */
-
-void
-free_rbi_pool (void)
-{
- free_alloc_pool (rbi_pool);
-}
-
-/* Initialize rbi (the structure containing data used by basic block
- duplication and reordering) for the given basic block. */
-
-void
-initialize_bb_rbi (basic_block bb)
-{
- gcc_assert (!bb->rbi);
- bb->rbi = pool_alloc (rbi_pool);
- memset (bb->rbi, 0, sizeof (struct reorder_block_def));
-}
-
/* Link block B to chain after AFTER. */
void
link_block (basic_block b, basic_block after)
int i;
basic_block bb;
- i = 0;
- FOR_EACH_BB (bb)
+ SET_BASIC_BLOCK (ENTRY_BLOCK, ENTRY_BLOCK_PTR);
+ SET_BASIC_BLOCK (EXIT_BLOCK, EXIT_BLOCK_PTR);
+
+ i = NUM_FIXED_BLOCKS;
+ FOR_EACH_BB (bb)
{
- BASIC_BLOCK (i) = bb;
+ SET_BASIC_BLOCK (i, bb);
bb->index = i;
i++;
}
gcc_assert (i == n_basic_blocks);
for (; i < last_basic_block; i++)
- BASIC_BLOCK (i) = NULL;
+ SET_BASIC_BLOCK (i, NULL);
last_basic_block = n_basic_blocks;
}
expunge_block (basic_block b)
{
unlink_block (b);
- BASIC_BLOCK (b->index) = NULL;
+ SET_BASIC_BLOCK (b->index, NULL);
n_basic_blocks--;
/* We should be able to ggc_free here, but we are not.
The dead SSA_NAMES are left pointing to dead statements that are pointing
clear out BB pointer of dead statements consistently. */
}
\f
+/* Connect E to E->src. */
+
+static inline void
+connect_src (edge e)
+{
+ VEC_safe_push (edge, gc, e->src->succs, e);
+}
+
+/* Connect E to E->dest. */
+
+static inline void
+connect_dest (edge e)
+{
+ basic_block dest = e->dest;
+ VEC_safe_push (edge, gc, dest->preds, e);
+ e->dest_idx = EDGE_COUNT (dest->preds) - 1;
+}
+
+/* Disconnect edge E from E->src. */
+
+static inline void
+disconnect_src (edge e)
+{
+ basic_block src = e->src;
+ edge_iterator ei;
+ edge tmp;
+
+ for (ei = ei_start (src->succs); (tmp = ei_safe_edge (ei)); )
+ {
+ if (tmp == e)
+ {
+ VEC_unordered_remove (edge, src->succs, ei.index);
+ return;
+ }
+ else
+ ei_next (&ei);
+ }
+
+ gcc_unreachable ();
+}
+
+/* Disconnect edge E from E->dest. */
+
+static inline void
+disconnect_dest (edge e)
+{
+ basic_block dest = e->dest;
+ unsigned int dest_idx = e->dest_idx;
+
+ VEC_unordered_remove (edge, dest->preds, dest_idx);
+
+ /* If we removed an edge in the middle of the edge vector, we need
+ to update dest_idx of the edge that moved into the "hole". */
+ if (dest_idx < EDGE_COUNT (dest->preds))
+ EDGE_PRED (dest, dest_idx)->dest_idx = dest_idx;
+}
+
/* Create an edge connecting SRC and DEST with flags FLAGS. Return newly
created edge. Use this only if you are sure that this edge can't
possibly already exist. */
e = ggc_alloc_cleared (sizeof (*e));
n_edges++;
- VEC_safe_push (edge, src->succs, e);
- VEC_safe_push (edge, dst->preds, e);
-
e->src = src;
e->dest = dst;
e->flags = flags;
+ connect_src (e);
+ connect_dest (e);
+
+ execute_on_growing_pred (e);
+
return e;
}
edge cache CACHE. Return the new edge, NULL if already exist. */
edge
-cached_make_edge (sbitmap *edge_cache, basic_block src, basic_block dst, int flags)
+cached_make_edge (sbitmap edge_cache, basic_block src, basic_block dst, int flags)
{
- int use_edge_cache;
- edge e;
- edge_iterator ei;
-
- /* Don't bother with edge cache for ENTRY or EXIT, if there aren't that
- many edges to them, or we didn't allocate memory for it. */
- use_edge_cache = (edge_cache
- && src != ENTRY_BLOCK_PTR && dst != EXIT_BLOCK_PTR);
+ if (edge_cache == NULL
+ || src == ENTRY_BLOCK_PTR
+ || dst == EXIT_BLOCK_PTR)
+ return make_edge (src, dst, flags);
- /* Make sure we don't add duplicate edges. */
- switch (use_edge_cache)
+ /* Does the requested edge already exist? */
+ if (! TEST_BIT (edge_cache, dst->index))
{
- default:
- /* Quick test for non-existence of the edge. */
- if (! TEST_BIT (edge_cache[src->index], dst->index))
- break;
-
- /* The edge exists; early exit if no work to do. */
- if (flags == 0)
- return NULL;
-
- /* Fall through. */
- case 0:
- FOR_EACH_EDGE (e, ei, src->succs)
- if (e->dest == dst)
- {
- e->flags |= flags;
- return NULL;
- }
- break;
+ /* The edge does not exist. Create one and update the
+ cache. */
+ SET_BIT (edge_cache, dst->index);
+ return unchecked_make_edge (src, dst, flags);
}
- e = unchecked_make_edge (src, dst, flags);
-
- if (use_edge_cache)
- SET_BIT (edge_cache[src->index], dst->index);
+ /* At this point, we know that the requested edge exists. Adjust
+ flags if necessary. */
+ if (flags)
+ {
+ edge e = find_edge (src, dst);
+ e->flags |= flags;
+ }
- return e;
+ return NULL;
}
/* Create an edge connecting SRC and DEST with flags FLAGS. Return newly
edge
make_edge (basic_block src, basic_block dest, int flags)
{
- return cached_make_edge (NULL, src, dest, flags);
+ edge e = find_edge (src, dest);
+
+ /* Make sure we don't add duplicate edges. */
+ if (e)
+ {
+ e->flags |= flags;
+ return NULL;
+ }
+
+ return unchecked_make_edge (src, dest, flags);
}
/* Create an edge connecting SRC to DEST and set probability by knowing
void
remove_edge (edge e)
{
- edge tmp;
- basic_block src, dest;
- bool found = false;
- edge_iterator ei;
+ remove_predictions_associated_with_edge (e);
+ execute_on_shrinking_pred (e);
- src = e->src;
- dest = e->dest;
-
- for (ei = ei_start (src->succs); (tmp = ei_safe_edge (ei)); )
- {
- if (tmp == e)
- {
- VEC_unordered_remove (edge, src->succs, ei.index);
- found = true;
- break;
- }
- else
- ei_next (&ei);
- }
-
- gcc_assert (found);
-
- found = false;
- for (ei = ei_start (dest->preds); (tmp = ei_safe_edge (ei)); )
- {
- if (tmp == e)
- {
- VEC_unordered_remove (edge, dest->preds, ei.index);
- found = true;
- break;
- }
- else
- ei_next (&ei);
- }
-
- gcc_assert (found);
+ disconnect_src (e);
+ disconnect_dest (e);
free_edge (e);
}
void
redirect_edge_succ (edge e, basic_block new_succ)
{
- edge tmp;
- edge_iterator ei;
- bool found = false;
+ execute_on_shrinking_pred (e);
- /* Disconnect the edge from the old successor block. */
- for (ei = ei_start (e->dest->preds); (tmp = ei_safe_edge (ei)); )
- {
- if (tmp == e)
- {
- VEC_unordered_remove (edge, e->dest->preds, ei.index);
- found = true;
- break;
- }
- else
- ei_next (&ei);
- }
+ disconnect_dest (e);
- gcc_assert (found);
+ e->dest = new_succ;
/* Reconnect the edge to the new successor block. */
- VEC_safe_push (edge, new_succ->preds, e);
- e->dest = new_succ;
+ connect_dest (e);
+
+ execute_on_growing_pred (e);
}
/* Like previous but avoid possible duplicate edge. */
void
redirect_edge_pred (edge e, basic_block new_pred)
{
- edge tmp;
- edge_iterator ei;
- bool found = false;
+ disconnect_src (e);
- /* Disconnect the edge from the old predecessor block. */
- for (ei = ei_start (e->src->succs); (tmp = ei_safe_edge (ei)); )
- {
- if (tmp == e)
- {
- VEC_unordered_remove (edge, e->src->succs, ei.index);
- found = true;
- break;
- }
- else
- ei_next (&ei);
- }
-
- gcc_assert (found);
+ e->src = new_pred;
/* Reconnect the edge to the new predecessor block. */
- VEC_safe_push (edge, new_pred->succs, e);
- e->src = new_pred;
+ connect_src (e);
}
/* Clear all basic block flags, with the exception of partitioning. */
basic_block bb;
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
- bb->flags = BB_PARTITION (bb);
+ bb->flags = (BB_PARTITION (bb) | (bb->flags & BB_DISABLE_SCHEDULE)
+ | (bb->flags & BB_RTL));
}
\f
/* Check the consistency of profile information. We can't do that
}
}
\f
+/* Emit basic block information for BB. HEADER is true if the user wants
+ the generic information and the predecessors, FOOTER is true if they want
+ the successors. FLAGS is the dump flags of interest; TDF_DETAILS emit
+ global register liveness information. PREFIX is put in front of every
+ line. The output is emitted to FILE. */
void
-dump_flow_info (FILE *file)
+dump_bb_info (basic_block bb, bool header, bool footer, int flags,
+ const char *prefix, FILE *file)
+{
+ edge e;
+ edge_iterator ei;
+
+ if (header)
+ {
+ fprintf (file, "\n%sBasic block %d ", prefix, bb->index);
+ if (bb->prev_bb)
+ fprintf (file, ", prev %d", bb->prev_bb->index);
+ if (bb->next_bb)
+ fprintf (file, ", next %d", 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, "%sPredecessors: ", prefix);
+ FOR_EACH_EDGE (e, ei, bb->preds)
+ dump_edge_info (file, e, 0);
+ }
+
+ if (footer)
+ {
+ fprintf (file, "\n%sSuccessors: ", prefix);
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ dump_edge_info (file, e, 1);
+ }
+
+ if ((flags & TDF_DETAILS)
+ && (bb->flags & BB_RTL))
+ {
+ if (bb->il.rtl->global_live_at_start && header)
+ {
+ fprintf (file, "\n%sRegisters live at start:", prefix);
+ dump_regset (bb->il.rtl->global_live_at_start, file);
+ }
+
+ if (bb->il.rtl->global_live_at_end && footer)
+ {
+ fprintf (file, "\n%sRegisters live at end:", prefix);
+ dump_regset (bb->il.rtl->global_live_at_end, file);
+ }
+ }
+
+ putc ('\n', file);
+}
+
+void
+dump_flow_info (FILE *file, int flags)
{
- int i;
basic_block bb;
- static const char * const reg_class_names[] = REG_CLASS_NAMES;
- if (reg_n_info)
+ /* There are no pseudo registers after reload. Don't dump them. */
+ if (reg_n_info && !reload_completed
+ && (flags & TDF_DETAILS) != 0)
{
- int max_regno = max_reg_num ();
- fprintf (file, "%d registers.\n", max_regno);
- for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
+ unsigned int i, max = max_reg_num ();
+ fprintf (file, "%d registers.\n", max);
+ for (i = FIRST_PSEUDO_REGISTER; i < max; i++)
if (REG_N_REFS (i))
{
enum reg_class class, altclass;
fprintf (file, "\n%d basic blocks, %d edges.\n", n_basic_blocks, n_edges);
FOR_EACH_BB (bb)
{
- edge e;
- edge_iterator ei;
-
- 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_EACH_EDGE (e, ei, bb->preds)
- dump_edge_info (file, e, 0);
-
- fprintf (file, "\nSuccessors: ");
- FOR_EACH_EDGE (e, ei, bb->succs)
- dump_edge_info (file, e, 1);
-
- if (bb->global_live_at_start)
- {
- fprintf (file, "\nRegisters live at start:");
- dump_regset (bb->global_live_at_start, file);
- }
-
- if (bb->global_live_at_end)
- {
- fprintf (file, "\nRegisters live at end:");
- dump_regset (bb->global_live_at_end, file);
- }
-
- putc ('\n', file);
+ dump_bb_info (bb, true, true, flags, "", file);
check_bb_profile (bb, file);
}
void
debug_flow_info (void)
{
- dump_flow_info (stderr);
+ dump_flow_info (stderr, TDF_DETAILS);
}
void
bb->count -= count;
if (bb->count < 0)
- bb->count = 0;
+ {
+ if (dump_file)
+ fprintf (dump_file, "bb %i count became negative after threading",
+ bb->index);
+ bb->count = 0;
+ }
/* Compute the probability of TAKEN_EDGE being reached via threaded edge.
Watch for overflows. */
for (; (c = ei_safe_edge (ei)); ei_next (&ei))
c->probability = 0;
}
- else
- FOR_EACH_EDGE (c, ei, bb->succs)
- c->probability = ((c->probability * REG_BR_PROB_BASE) / (double) prob);
+ else if (prob != REG_BR_PROB_BASE)
+ {
+ int scale = RDIV (65536 * REG_BR_PROB_BASE, prob);
+
+ FOR_EACH_EDGE (c, ei, bb->succs)
+ {
+ c->probability = RDIV (c->probability * scale, 65536);
+ if (c->probability > REG_BR_PROB_BASE)
+ c->probability = REG_BR_PROB_BASE;
+ }
+ }
- if (bb != taken_edge->src)
- abort ();
+ gcc_assert (bb == taken_edge->src);
taken_edge->count -= count;
if (taken_edge->count < 0)
- taken_edge->count = 0;
+ {
+ if (dump_file)
+ fprintf (dump_file, "edge %i->%i count became negative after threading",
+ taken_edge->src->index, taken_edge->dest->index);
+ taken_edge->count = 0;
+ }
+}
+
+/* Multiply all frequencies of basic blocks in array BBS of length NBBS
+ by NUM/DEN, in int arithmetic. May lose some accuracy. */
+void
+scale_bbs_frequencies_int (basic_block *bbs, int nbbs, int num, int den)
+{
+ int i;
+ edge e;
+ if (num < 0)
+ num = 0;
+ if (num > den)
+ return;
+ /* Assume that the users are producing the fraction from frequencies
+ that never grow far enough to risk arithmetic overflow. */
+ gcc_assert (num < 65536);
+ for (i = 0; i < nbbs; i++)
+ {
+ edge_iterator ei;
+ bbs[i]->frequency = RDIV (bbs[i]->frequency * num, den);
+ bbs[i]->count = RDIV (bbs[i]->count * num, den);
+ FOR_EACH_EDGE (e, ei, bbs[i]->succs)
+ e->count = RDIV (e->count * num, den);
+ }
+}
+
+/* numbers smaller than this value are safe to multiply without getting
+ 64bit overflow. */
+#define MAX_SAFE_MULTIPLIER (1 << (sizeof (HOST_WIDEST_INT) * 4 - 1))
+
+/* Multiply all frequencies of basic blocks in array BBS of length NBBS
+ by NUM/DEN, in gcov_type arithmetic. More accurate than previous
+ function but considerably slower. */
+void
+scale_bbs_frequencies_gcov_type (basic_block *bbs, int nbbs, gcov_type num,
+ gcov_type den)
+{
+ int i;
+ edge e;
+ gcov_type fraction = RDIV (num * 65536, den);
+
+ gcc_assert (fraction >= 0);
+
+ if (num < MAX_SAFE_MULTIPLIER)
+ for (i = 0; i < nbbs; i++)
+ {
+ edge_iterator ei;
+ bbs[i]->frequency = RDIV (bbs[i]->frequency * num, den);
+ if (bbs[i]->count <= MAX_SAFE_MULTIPLIER)
+ bbs[i]->count = RDIV (bbs[i]->count * num, den);
+ else
+ bbs[i]->count = RDIV (bbs[i]->count * fraction, 65536);
+ FOR_EACH_EDGE (e, ei, bbs[i]->succs)
+ if (bbs[i]->count <= MAX_SAFE_MULTIPLIER)
+ e->count = RDIV (e->count * num, den);
+ else
+ e->count = RDIV (e->count * fraction, 65536);
+ }
+ else
+ for (i = 0; i < nbbs; i++)
+ {
+ edge_iterator ei;
+ if (sizeof (gcov_type) > sizeof (int))
+ bbs[i]->frequency = RDIV (bbs[i]->frequency * num, den);
+ else
+ bbs[i]->frequency = RDIV (bbs[i]->frequency * fraction, 65536);
+ bbs[i]->count = RDIV (bbs[i]->count * fraction, 65536);
+ FOR_EACH_EDGE (e, ei, bbs[i]->succs)
+ e->count = RDIV (e->count * fraction, 65536);
+ }
+}
+
+/* Data structures used to maintain mapping between basic blocks and
+ copies. */
+static htab_t bb_original;
+static htab_t bb_copy;
+static alloc_pool original_copy_bb_pool;
+
+struct htab_bb_copy_original_entry
+{
+ /* Block we are attaching info to. */
+ int index1;
+ /* Index of original or copy (depending on the hashtable) */
+ int index2;
+};
+
+static hashval_t
+bb_copy_original_hash (const void *p)
+{
+ struct htab_bb_copy_original_entry *data
+ = ((struct htab_bb_copy_original_entry *)p);
+
+ return data->index1;
+}
+static int
+bb_copy_original_eq (const void *p, const void *q)
+{
+ struct htab_bb_copy_original_entry *data
+ = ((struct htab_bb_copy_original_entry *)p);
+ struct htab_bb_copy_original_entry *data2
+ = ((struct htab_bb_copy_original_entry *)q);
+
+ return data->index1 == data2->index1;
+}
+
+/* Initialize the data structures to maintain mapping between blocks
+ and its copies. */
+void
+initialize_original_copy_tables (void)
+{
+ gcc_assert (!original_copy_bb_pool);
+ original_copy_bb_pool
+ = create_alloc_pool ("original_copy",
+ sizeof (struct htab_bb_copy_original_entry), 10);
+ bb_original = htab_create (10, bb_copy_original_hash,
+ bb_copy_original_eq, NULL);
+ bb_copy = htab_create (10, bb_copy_original_hash, bb_copy_original_eq, NULL);
+}
+
+/* Free the data structures to maintain mapping between blocks and
+ its copies. */
+void
+free_original_copy_tables (void)
+{
+ gcc_assert (original_copy_bb_pool);
+ htab_delete (bb_copy);
+ htab_delete (bb_original);
+ free_alloc_pool (original_copy_bb_pool);
+ bb_copy = NULL;
+ bb_original = NULL;
+ original_copy_bb_pool = NULL;
+}
+
+/* Set original for basic block. Do nothing when data structures are not
+ initialized so passes not needing this don't need to care. */
+void
+set_bb_original (basic_block bb, basic_block original)
+{
+ if (original_copy_bb_pool)
+ {
+ struct htab_bb_copy_original_entry **slot;
+ struct htab_bb_copy_original_entry key;
+
+ key.index1 = bb->index;
+ slot =
+ (struct htab_bb_copy_original_entry **) htab_find_slot (bb_original,
+ &key, INSERT);
+ if (*slot)
+ (*slot)->index2 = original->index;
+ else
+ {
+ *slot = pool_alloc (original_copy_bb_pool);
+ (*slot)->index1 = bb->index;
+ (*slot)->index2 = original->index;
+ }
+ }
+}
+
+/* Get the original basic block. */
+basic_block
+get_bb_original (basic_block bb)
+{
+ struct htab_bb_copy_original_entry *entry;
+ struct htab_bb_copy_original_entry key;
+
+ gcc_assert (original_copy_bb_pool);
+
+ key.index1 = bb->index;
+ entry = (struct htab_bb_copy_original_entry *) htab_find (bb_original, &key);
+ if (entry)
+ return BASIC_BLOCK (entry->index2);
+ else
+ return NULL;
+}
+
+/* Set copy for basic block. Do nothing when data structures are not
+ initialized so passes not needing this don't need to care. */
+void
+set_bb_copy (basic_block bb, basic_block copy)
+{
+ if (original_copy_bb_pool)
+ {
+ struct htab_bb_copy_original_entry **slot;
+ struct htab_bb_copy_original_entry key;
+
+ key.index1 = bb->index;
+ slot =
+ (struct htab_bb_copy_original_entry **) htab_find_slot (bb_copy,
+ &key, INSERT);
+ if (*slot)
+ (*slot)->index2 = copy->index;
+ else
+ {
+ *slot = pool_alloc (original_copy_bb_pool);
+ (*slot)->index1 = bb->index;
+ (*slot)->index2 = copy->index;
+ }
+ }
+}
+
+/* Get the copy of basic block. */
+basic_block
+get_bb_copy (basic_block bb)
+{
+ struct htab_bb_copy_original_entry *entry;
+ struct htab_bb_copy_original_entry key;
+
+ gcc_assert (original_copy_bb_pool);
+
+ key.index1 = bb->index;
+ entry = (struct htab_bb_copy_original_entry *) htab_find (bb_copy, &key);
+ if (entry)
+ return BASIC_BLOCK (entry->index2);
+ else
+ return NULL;
}
OSDN Git Service
