/* Control flow graph manipulation code for GNU compiler.
Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of GCC.
02111-1307, USA. */
/* This file contains low level functions to manipulate the CFG and
- analyze it. All other modules should not transform the datastructure
+ analyze it. All other modules should not transform the data structure
directly and use abstraction instead. The file is supposed to be
ordered bottom-up and should not contain any code dependent on a
particular intermediate language (RTL or trees).
- Allocation of AUX fields for basic blocks
alloc_aux_for_blocks, free_aux_for_blocks, alloc_aux_for_block
- clear_bb_flags
+ - Consistency checking
+ verify_flow_info
+ - Dumping and debugging
+ print_rtl_with_bb, dump_bb, debug_bb, debug_bb_n
*/
\f
#include "config.h"
NULL, /* loop_father */
0, /* count */
0, /* frequency */
- 0 /* flags */
+ 0, /* flags */
+ NULL /* rbi */
},
{
NULL, /* head */
NULL, /* loop_father */
0, /* count */
0, /* frequency */
- 0 /* flags */
+ 0, /* flags */
+ NULL /* rbi */
}
};
-void debug_flow_info PARAMS ((void));
-static void free_edge PARAMS ((edge));
+void debug_flow_info (void);
+static void free_edge (edge);
\f
/* Called once at initialization time. */
void
-init_flow ()
+init_flow (void)
{
static int initialized;
if (!initialized)
{
gcc_obstack_init (&flow_obstack);
- flow_firstobj = (char *) obstack_alloc (&flow_obstack, 0);
+ flow_firstobj = obstack_alloc (&flow_obstack, 0);
initialized = 1;
}
else
free_alloc_pool (bb_pool);
free_alloc_pool (edge_pool);
obstack_free (&flow_obstack, flow_firstobj);
- flow_firstobj = (char *) obstack_alloc (&flow_obstack, 0);
+ flow_firstobj = obstack_alloc (&flow_obstack, 0);
}
- bb_pool = create_alloc_pool ("Basic block pool",
+ bb_pool = create_alloc_pool ("Basic block pool",
sizeof (struct basic_block_def), 100);
edge_pool = create_alloc_pool ("Edge pool",
sizeof (struct edge_def), 100);
without actually unlinking it from the pred/succ lists. */
static void
-free_edge (e)
- edge e;
+free_edge (edge e)
{
n_edges--;
pool_free (edge_pool, e);
/* Free the memory associated with the edge structures. */
void
-clear_edges ()
+clear_edges (void)
{
basic_block bb;
edge e;
/* Allocate memory for basic_block. */
basic_block
-alloc_block ()
+alloc_block (void)
{
basic_block bb;
bb = pool_alloc (bb_pool);
/* Link block B to chain after AFTER. */
void
-link_block (b, after)
- basic_block b, after;
+link_block (basic_block b, basic_block after)
{
b->next_bb = after->next_bb;
b->prev_bb = after;
/* Unlink block B from chain. */
void
-unlink_block (b)
- basic_block b;
+unlink_block (basic_block b)
{
b->next_bb->prev_bb = b->prev_bb;
b->prev_bb->next_bb = b->next_bb;
/* Sequentially order blocks and compact the arrays. */
void
-compact_blocks ()
+compact_blocks (void)
{
int i;
basic_block bb;
-
+
i = 0;
FOR_EACH_BB (bb)
{
/* Remove block B from the basic block array. */
void
-expunge_block (b)
- basic_block b;
+expunge_block (basic_block b)
{
unlink_block (b);
BASIC_BLOCK (b->index) = NULL;
pool_free (bb_pool, b);
}
\f
+/* 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. */
+
+edge
+unchecked_make_edge (basic_block src, basic_block dst, int flags)
+{
+ edge e;
+ e = pool_alloc (edge_pool);
+ memset (e, 0, 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;
+}
+
/* Create an edge connecting SRC and DST with FLAGS optionally using
edge cache CACHE. Return the new edge, NULL if already exist. */
edge
-cached_make_edge (edge_cache, src, dst, flags)
- sbitmap *edge_cache;
- basic_block src, dst;
- int flags;
+cached_make_edge (sbitmap *edge_cache, basic_block src, basic_block dst, int flags)
{
int use_edge_cache;
edge e;
}
break;
}
-
-
- e = pool_alloc (edge_pool);
- memset (e, 0, 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;
+ e = unchecked_make_edge (src, dst, flags);
if (use_edge_cache)
SET_BIT (edge_cache[src->index], dst->index);
created edge or NULL if already exist. */
edge
-make_edge (src, dest, flags)
- basic_block src, dest;
- int flags;
+make_edge (basic_block src, basic_block dest, int flags)
{
return cached_make_edge (NULL, src, dest, flags);
}
that it is the single edge leaving SRC. */
edge
-make_single_succ_edge (src, dest, flags)
- basic_block src, dest;
- int flags;
+make_single_succ_edge (basic_block src, basic_block dest, int flags)
{
edge e = make_edge (src, dest, flags);
/* This function will remove an edge from the flow graph. */
void
-remove_edge (e)
- edge e;
+remove_edge (edge e)
{
edge last_pred = NULL;
edge last_succ = NULL;
/* Redirect an edge's successor from one block to another. */
void
-redirect_edge_succ (e, new_succ)
- edge e;
- basic_block new_succ;
+redirect_edge_succ (edge e, basic_block new_succ)
{
edge *pe;
/* Like previous but avoid possible duplicate edge. */
edge
-redirect_edge_succ_nodup (e, new_succ)
- edge e;
- basic_block new_succ;
+redirect_edge_succ_nodup (edge e, basic_block new_succ)
{
edge s;
/* Redirect an edge's predecessor from one block to another. */
void
-redirect_edge_pred (e, new_pred)
- edge e;
- basic_block new_pred;
+redirect_edge_pred (edge e, basic_block new_pred)
{
edge *pe;
}
void
-clear_bb_flags ()
+clear_bb_flags (void)
{
basic_block bb;
}
\f
void
-dump_flow_info (file)
- FILE *file;
+dump_flow_info (FILE *file)
{
int i;
+ int max_regno = max_reg_num ();
basic_block bb;
static const char * const reg_class_names[] = REG_CLASS_NAMES;
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");
- }
+ if (reg_n_info)
+ 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)
}
void
-debug_flow_info ()
+debug_flow_info (void)
{
dump_flow_info (stderr);
}
void
-dump_edge_info (file, e, do_succ)
- FILE *file;
- edge e;
- int do_succ;
+dump_edge_info (FILE *file, edge e, int do_succ)
{
basic_block side = (do_succ ? e->dest : e->src);
if (e->flags)
{
- static const char * const bitnames[]
- = {"fallthru", "ab", "abcall", "eh", "fake", "dfs_back", "can_fallthru"};
+ static const char * const bitnames[] = {
+ "fallthru", "ab", "abcall", "eh", "fake", "dfs_back",
+ "can_fallthru", "irreducible", "sibcall", "loop_exit"
+ };
int comma = 0;
int i, flags = e->flags;
be first initialized by alloc_aux_for_blocks. */
inline void
-alloc_aux_for_block (bb, size)
- basic_block bb;
- int size;
+alloc_aux_for_block (basic_block bb, int size)
{
/* Verify that aux field is clear. */
if (bb->aux || !first_block_aux_obj)
alloc_aux_for_block for each basic block. */
void
-alloc_aux_for_blocks (size)
- int size;
+alloc_aux_for_blocks (int size)
{
static int initialized;
/* Check whether AUX data are still allocated. */
else if (first_block_aux_obj)
abort ();
- first_block_aux_obj = (char *) obstack_alloc (&block_aux_obstack, 0);
+ first_block_aux_obj = obstack_alloc (&block_aux_obstack, 0);
if (size)
{
basic_block bb;
/* Clear AUX pointers of all blocks. */
void
-clear_aux_for_blocks ()
+clear_aux_for_blocks (void)
{
basic_block bb;
of all blocks. */
void
-free_aux_for_blocks ()
+free_aux_for_blocks (void)
{
if (!first_block_aux_obj)
abort ();
be first initialized by alloc_aux_for_edges. */
inline void
-alloc_aux_for_edge (e, size)
- edge e;
- int size;
+alloc_aux_for_edge (edge e, int size)
{
/* Verify that aux field is clear. */
if (e->aux || !first_edge_aux_obj)
alloc_aux_for_edge for each basic edge. */
void
-alloc_aux_for_edges (size)
- int size;
+alloc_aux_for_edges (int size)
{
static int initialized;
else if (first_edge_aux_obj)
abort ();
- first_edge_aux_obj = (char *) obstack_alloc (&edge_aux_obstack, 0);
+ first_edge_aux_obj = obstack_alloc (&edge_aux_obstack, 0);
if (size)
{
basic_block bb;
/* Clear AUX pointers of all edges. */
void
-clear_aux_for_edges ()
+clear_aux_for_edges (void)
{
basic_block bb;
edge e;
of all edges. */
void
-free_aux_for_edges ()
+free_aux_for_edges (void)
{
if (!first_edge_aux_obj)
abort ();
clear_aux_for_edges ();
}
+
+/* Verify the CFG consistency.
+
+ Currently it does following checks edge and basic block list correctness
+ and calls into IL dependent checking then. */
+void
+verify_flow_info (void)
+{
+ size_t *edge_checksum;
+ int num_bb_notes, err = 0;
+ basic_block bb, last_bb_seen;
+ basic_block *last_visited;
+
+ last_visited = xcalloc (last_basic_block + 2, sizeof (basic_block));
+ edge_checksum = xcalloc (last_basic_block + 2, sizeof (size_t));
+
+ /* Check bb chain & numbers. */
+ last_bb_seen = ENTRY_BLOCK_PTR;
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR->next_bb, NULL, next_bb)
+ {
+ if (bb != EXIT_BLOCK_PTR
+ && bb != BASIC_BLOCK (bb->index))
+ {
+ error ("bb %d on wrong place", bb->index);
+ err = 1;
+ }
+
+ if (bb->prev_bb != last_bb_seen)
+ {
+ error ("prev_bb of %d should be %d, not %d",
+ bb->index, last_bb_seen->index, bb->prev_bb->index);
+ err = 1;
+ }
+
+ last_bb_seen = bb;
+ }
+
+ /* Now check the basic blocks (boundaries etc.) */
+ FOR_EACH_BB_REVERSE (bb)
+ {
+ int n_fallthru = 0;
+ edge e;
+
+ if (bb->count < 0)
+ {
+ error ("verify_flow_info: Wrong count of block %i %i",
+ bb->index, (int)bb->count);
+ err = 1;
+ }
+ if (bb->frequency < 0)
+ {
+ error ("verify_flow_info: Wrong frequency of block %i %i",
+ bb->index, bb->frequency);
+ err = 1;
+ }
+ for (e = bb->succ; e; e = e->succ_next)
+ {
+ if (last_visited [e->dest->index + 2] == bb)
+ {
+ error ("verify_flow_info: Duplicate edge %i->%i",
+ e->src->index, e->dest->index);
+ err = 1;
+ }
+ if (e->probability < 0 || e->probability > REG_BR_PROB_BASE)
+ {
+ error ("verify_flow_info: Wrong probability of edge %i->%i %i",
+ e->src->index, e->dest->index, e->probability);
+ err = 1;
+ }
+ if (e->count < 0)
+ {
+ error ("verify_flow_info: Wrong count of edge %i->%i %i",
+ e->src->index, e->dest->index, (int)e->count);
+ err = 1;
+ }
+
+ last_visited [e->dest->index + 2] = bb;
+
+ if (e->flags & EDGE_FALLTHRU)
+ n_fallthru++;
+
+ if (e->src != bb)
+ {
+ error ("verify_flow_info: Basic block %d succ edge is corrupted",
+ bb->index);
+ fprintf (stderr, "Predecessor: ");
+ dump_edge_info (stderr, e, 0);
+ fprintf (stderr, "\nSuccessor: ");
+ dump_edge_info (stderr, e, 1);
+ fprintf (stderr, "\n");
+ err = 1;
+ }
+
+ edge_checksum[e->dest->index + 2] += (size_t) e;
+ }
+ if (n_fallthru > 1)
+ {
+ error ("Wrong amount of branch edges after unconditional jump %i", bb->index);
+ err = 1;
+ }
+
+ for (e = bb->pred; e; e = e->pred_next)
+ {
+ if (e->dest != bb)
+ {
+ error ("basic block %d pred edge is corrupted", bb->index);
+ fputs ("Predecessor: ", stderr);
+ dump_edge_info (stderr, e, 0);
+ fputs ("\nSuccessor: ", stderr);
+ dump_edge_info (stderr, e, 1);
+ fputc ('\n', stderr);
+ err = 1;
+ }
+ edge_checksum[e->dest->index + 2] -= (size_t) e;
+ }
+ }
+
+ /* Complete edge checksumming for ENTRY and EXIT. */
+ {
+ edge e;
+
+ for (e = ENTRY_BLOCK_PTR->succ; e ; e = e->succ_next)
+ edge_checksum[e->dest->index + 2] += (size_t) e;
+
+ for (e = EXIT_BLOCK_PTR->pred; e ; e = e->pred_next)
+ edge_checksum[e->dest->index + 2] -= (size_t) e;
+ }
+
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
+ if (edge_checksum[bb->index + 2])
+ {
+ error ("basic block %i edge lists are corrupted", bb->index);
+ err = 1;
+ }
+
+ num_bb_notes = 0;
+ last_bb_seen = ENTRY_BLOCK_PTR;
+
+ /* Clean up. */
+ free (last_visited);
+ free (edge_checksum);
+ err |= cfg_hooks->cfgh_verify_flow_info ();
+ if (err)
+ internal_error ("verify_flow_info failed");
+}
+
+/* Print out one basic block with live information at start and end. */
+
+void
+dump_bb (basic_block bb, FILE *outf)
+{
+ edge e;
+
+ fprintf (outf, ";; Basic block %d, loop depth %d, count ",
+ bb->index, bb->loop_depth);
+ fprintf (outf, HOST_WIDEST_INT_PRINT_DEC, (HOST_WIDEST_INT) bb->count);
+ putc ('\n', outf);
+
+ cfg_hooks->dump_bb (bb, outf);
+
+ fputs (";; Successors: ", outf);
+ for (e = bb->succ; e; e = e->succ_next)
+ dump_edge_info (outf, e, 1);
+ putc ('\n', outf);
+}
+
+void
+debug_bb (basic_block bb)
+{
+ dump_bb (bb, stderr);
+}
+
+basic_block
+debug_bb_n (int n)
+{
+ basic_block bb = BASIC_BLOCK (n);
+ dump_bb (bb, stderr);
+ return bb;
+}
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