/* Miscellaneous SSA utility functions.
- Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of GCC.
#include "tree-dump.h"
#include "tree-pass.h"
-
-/* Remove edge E and remove the corresponding arguments from the PHI nodes
- in E's destination block. */
-
-void
-ssa_remove_edge (edge e)
-{
- /* Remove all PHI arguments for E. */
- remove_phi_args (e);
-
- remove_edge (e);
-}
-
/* Remove the corresponding arguments from the PHI nodes in E's
destination block and redirect it to DEST. Return redirected edge.
The list of removed arguments is stored in PENDING_STMT (e). */
next = PHI_CHAIN (phi);
i = phi_arg_from_edge (phi, e);
- if (i < 0)
+ if (PHI_ARG_DEF (phi, i) == NULL_TREE)
continue;
src = PHI_ARG_DEF (phi, i);
node = build_tree_list (dst, src);
*last = node;
last = &TREE_CHAIN (node);
-
- remove_phi_arg_num (phi, i);
}
e = redirect_edge_succ_nodup (e, dest);
phi = PHI_CHAIN (phi), arg = TREE_CHAIN (arg))
{
tree def = TREE_VALUE (arg);
- add_phi_arg (&phi, def, e);
+ add_phi_arg (phi, def, e);
}
PENDING_STMT (e) = NULL;
edge e;
bool err = false;
unsigned i, phi_num_args = PHI_NUM_ARGS (phi);
- edge_iterator ei;
if (EDGE_COUNT (bb->preds) != phi_num_args)
{
goto error;
}
- /* Mark all the incoming edges. */
- FOR_EACH_EDGE (e, ei, bb->preds)
- e->aux = (void *) 1;
-
for (i = 0; i < phi_num_args; i++)
{
tree op = PHI_ARG_DEF (phi, i);
+ e = EDGE_PRED (bb, i);
+
+ if (op == NULL_TREE)
+ {
+ error ("PHI argument is missing for edge %d->%d\n",
+ e->src->index,
+ e->dest->index);
+ err = true;
+ goto error;
+ }
+
if (TREE_CODE (op) != SSA_NAME && !is_gimple_min_invariant (op))
{
error ("PHI argument is not SSA_NAME, or invariant");
err = true;
}
- e = PHI_ARG_EDGE (phi, i);
-
if (TREE_CODE (op) == SSA_NAME)
err = verify_use (e->src, definition_block[SSA_NAME_VERSION (op)], op,
phi, e->flags & EDGE_ABNORMAL,
err = true;
}
- if (e->aux == (void *) 0)
- {
- error ("PHI argument flowing through dead or duplicated edge %d->%d\n",
- e->src->index, e->dest->index);
- err = true;
- }
-
if (err)
{
fprintf (stderr, "PHI argument\n");
print_generic_stmt (stderr, op, TDF_VOPS);
goto error;
}
-
- e->aux = (void *) 0;
}
error:
for (i = 1; i < num_ssa_names; i++)
{
+ tree var;
var_ann_t ann;
struct ptr_info_def *pi;
+
ptr = ssa_name (i);
if (!ptr)
continue;
- ann = var_ann (SSA_NAME_VAR (ptr));
- pi = SSA_NAME_PTR_INFO (ptr);
/* We only care for pointers that are actually referenced in the
program. */
- if (!TREE_VISITED (ptr) || !POINTER_TYPE_P (TREE_TYPE (ptr)))
+ if (!POINTER_TYPE_P (TREE_TYPE (ptr)) || !TREE_VISITED (ptr))
continue;
/* RESULT_DECL is special. If it's a GIMPLE register, then it
is only written-to only once in the return statement.
Otherwise, aggregate RESULT_DECLs may be written-to more than
once in virtual operands. */
- if (TREE_CODE (SSA_NAME_VAR (ptr)) == RESULT_DECL
+ var = SSA_NAME_VAR (ptr);
+ if (TREE_CODE (var) == RESULT_DECL
&& is_gimple_reg (ptr))
continue;
+ pi = SSA_NAME_PTR_INFO (ptr);
if (pi == NULL)
continue;
+ ann = var_ann (var);
if (pi->is_dereferenced && !pi->name_mem_tag && !ann->type_mem_tag)
{
error ("Dereferenced pointers should have a name or a type tag");
same name tag must have the same points-to set.
So we check a single variable for each name tag, and verify that its
points-to set is different from every other points-to set for other name
- tags. */
+ tags.
+
+ Additionally, given a pointer P_i with name tag NMT and type tag
+ TMT, this function verified the alias set of TMT is a superset of
+ the alias set of NMT. */
static void
verify_name_tags (void)
bitmap first, second;
VEC (tree) *name_tag_reps = NULL;
VEC (bitmap) *pt_vars_for_reps = NULL;
+ bitmap type_aliases = BITMAP_XMALLOC ();
/* First we compute the name tag representatives and their points-to sets. */
for (i = 0; i < num_ssa_names; i++)
{
- if (ssa_name (i))
+ struct ptr_info_def *pi;
+ tree tmt, ptr = ssa_name (i);
+
+ if (ptr == NULL_TREE)
+ continue;
+
+ pi = SSA_NAME_PTR_INFO (ptr);
+
+ if (!TREE_VISITED (ptr)
+ || !POINTER_TYPE_P (TREE_TYPE (ptr))
+ || !pi
+ || !pi->name_mem_tag
+ || TREE_VISITED (pi->name_mem_tag))
+ continue;
+
+ TREE_VISITED (pi->name_mem_tag) = 1;
+
+ if (pi->pt_vars == NULL)
+ continue;
+
+ VEC_safe_push (tree, name_tag_reps, ptr);
+ VEC_safe_push (bitmap, pt_vars_for_reps, pi->pt_vars);
+
+ /* Verify that alias set of PTR's type tag is a superset of the
+ alias set of PTR's name tag. */
+ tmt = var_ann (SSA_NAME_VAR (ptr))->type_mem_tag;
+ if (tmt)
{
- tree ptr = ssa_name (i);
- struct ptr_info_def *pi = SSA_NAME_PTR_INFO (ptr);
- if (!TREE_VISITED (ptr)
- || !POINTER_TYPE_P (TREE_TYPE (ptr))
- || !pi
- || !pi->name_mem_tag
- || TREE_VISITED (pi->name_mem_tag))
+ size_t i;
+ varray_type aliases = var_ann (tmt)->may_aliases;
+ bitmap_clear (type_aliases);
+ for (i = 0; aliases && i < VARRAY_ACTIVE_SIZE (aliases); i++)
+ {
+ tree alias = VARRAY_TREE (aliases, i);
+ bitmap_set_bit (type_aliases, var_ann (alias)->uid);
+ }
+
+ /* When grouping, we may have added PTR's type tag into the
+ alias set of PTR's name tag. To prevent a false
+ positive, pretend that TMT is in its own alias set. */
+ bitmap_set_bit (type_aliases, var_ann (tmt)->uid);
+
+ if (bitmap_equal_p (type_aliases, pi->pt_vars))
continue;
- TREE_VISITED (pi->name_mem_tag) = 1;
- if (pi->pt_vars != NULL)
- {
- VEC_safe_push (tree, name_tag_reps, ptr);
- VEC_safe_push (bitmap, pt_vars_for_reps, pi->pt_vars);
+
+ if (!bitmap_intersect_compl_p (type_aliases, pi->pt_vars))
+ {
+ error ("Alias set of a pointer's type tag should be a superset of the corresponding name tag");
+ debug_variable (tmt);
+ debug_variable (pi->name_mem_tag);
+ goto err;
}
}
}
TREE_VISITED (pi->name_mem_tag) = 0;
}
}
+
VEC_free (bitmap, pt_vars_for_reps);
+ BITMAP_FREE (type_aliases);
return;
err:
debug_variable (VEC_index (tree, name_tag_reps, i));
internal_error ("verify_name_tags failed");
}
+
+
/* Verify the consistency of aliasing information. */
static void
}
if (val
- && !operand_equal_p (val, def, 0))
+ && !operand_equal_for_phi_arg_p (val, def))
return;
val = def;
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
- 0, /* tv_id */
+ TV_TREE_REDPHI, /* tv_id */
PROP_cfg | PROP_ssa | PROP_alias, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
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