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tree-ssa-structalias.c (get_constraint_for_component_ref): Add argument.

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2005-09-20  Daniel Berlin  <dberlin@dberlin.org>

	* tree-ssa-structalias.c (get_constraint_for_component_ref): Add
	argument.  Allow and set any offset if needs_anyoffset is passed
	in.
	(get_constraint_for): Add argument here too.
	Pass it down.
	(do_structure_copy): Pass NULL to get_constraint_for.
	(handle_ptr_arith): Ditto.
	(find_func_aliases): Ditto.

From-SVN: r104476
This commit is contained in:
Daniel Berlin 2005-09-21 01:42:53 +00:00 committed by Daniel Berlin
parent 8df091218f
commit d52225bef5
2 changed files with 36 additions and 19 deletions
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11
gcc/ChangeLog
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@ -1,3 +1,14 @@
2005-09-20 Daniel Berlin <dberlin@dberlin.org>
* tree-ssa-structalias.c (get_constraint_for_component_ref): Add
argument. Allow and set any offset if needs_anyoffset is passed
in.
(get_constraint_for): Add argument here too.
Pass it down.
(do_structure_copy): Pass NULL to get_constraint_for.
(handle_ptr_arith): Ditto.
(find_func_aliases): Ditto.
2005-09-20 J"orn Rennecke <joern.rennecke@st.com>
PR rtl-optimization/23898

44
gcc/tree-ssa-structalias.c
View File

@ -161,7 +161,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
static bool use_field_sensitive = true;
static unsigned int create_variable_info_for (tree, const char *);
static struct constraint_expr get_constraint_for (tree);
static struct constraint_expr get_constraint_for (tree, bool *);
static void build_constraint_graph (void);
static bitmap_obstack ptabitmap_obstack;
@ -2008,7 +2008,7 @@ offset_overlaps_with_access (const unsigned HOST_WIDE_INT fieldpos,
/* Given a COMPONENT_REF T, return the constraint_expr for it. */
static struct constraint_expr
get_constraint_for_component_ref (tree t)
get_constraint_for_component_ref (tree t, bool *needs_anyoffset)
{
struct constraint_expr result;
HOST_WIDE_INT bitsize;
@ -2039,7 +2039,7 @@ get_constraint_for_component_ref (tree t)
t = get_inner_reference (t, &bitsize, &bitpos, &offset, &mode,
&unsignedp, &volatilep, false);
result = get_constraint_for (t);
result = get_constraint_for (t, needs_anyoffset);
/* This can also happen due to weird offsetof type macros. */
if (TREE_CODE (t) != ADDR_EXPR && result.type == ADDRESSOF)
@ -2051,6 +2051,11 @@ get_constraint_for_component_ref (tree t)
{
result.offset = bitpos;
}
else if (needs_anyoffset)
{
result.offset = 0;
*needs_anyoffset = true;
}
else
{
result.var = anything_id;
@ -2131,7 +2136,7 @@ do_deref (struct constraint_expr cons)
/* Given a tree T, return the constraint expression for it. */
static struct constraint_expr
get_constraint_for (tree t)
get_constraint_for (tree t, bool *need_anyoffset)
{
struct constraint_expr temp;
@ -2168,7 +2173,7 @@ get_constraint_for (tree t)
{
case ADDR_EXPR:
{
temp = get_constraint_for (TREE_OPERAND (t, 0));
temp = get_constraint_for (TREE_OPERAND (t, 0), need_anyoffset);
if (temp.type == DEREF)
temp.type = SCALAR;
else
@ -2215,13 +2220,13 @@ get_constraint_for (tree t)
{
case INDIRECT_REF:
{
temp = get_constraint_for (TREE_OPERAND (t, 0));
temp = get_constraint_for (TREE_OPERAND (t, 0), need_anyoffset);
temp = do_deref (temp);
return temp;
}
case ARRAY_REF:
case COMPONENT_REF:
temp = get_constraint_for_component_ref (t);
temp = get_constraint_for_component_ref (t, need_anyoffset);
return temp;
default:
{
@ -2246,7 +2251,7 @@ get_constraint_for (tree t)
Anything else, we see through */
if (!(POINTER_TYPE_P (TREE_TYPE (t))
&& ! POINTER_TYPE_P (TREE_TYPE (op))))
return get_constraint_for (op);
return get_constraint_for (op, need_anyoffset);
/* FALLTHRU */
}
@ -2264,7 +2269,7 @@ get_constraint_for (tree t)
switch (TREE_CODE (t))
{
case PHI_NODE:
return get_constraint_for (PHI_RESULT (t));
return get_constraint_for (PHI_RESULT (t), need_anyoffset);
case SSA_NAME:
return get_constraint_exp_from_ssa_var (t);
default:
@ -2413,8 +2418,8 @@ do_structure_copy (tree lhsop, tree rhsop)
unsigned HOST_WIDE_INT lhssize;
unsigned HOST_WIDE_INT rhssize;
lhs = get_constraint_for (lhsop);
rhs = get_constraint_for (rhsop);
lhs = get_constraint_for (lhsop, NULL);
rhs = get_constraint_for (rhsop, NULL);
/* If we have special var = x, swap it around. */
if (lhs.var <= integer_id && !(get_varinfo (rhs.var)->is_special_var))
@ -2750,7 +2755,7 @@ handle_ptr_arith (struct constraint_expr lhs, tree expr)
op0 = TREE_OPERAND (expr, 0);
op1 = TREE_OPERAND (expr, 1);
base = get_constraint_for (op0);
base = get_constraint_for (op0, NULL);
offset.var = anyoffset_id;
offset.type = ADDRESSOF;
@ -2788,10 +2793,10 @@ find_func_aliases (tree t, struct alias_info *ai)
{
int i;
lhs = get_constraint_for (PHI_RESULT (t));
lhs = get_constraint_for (PHI_RESULT (t), NULL);
for (i = 0; i < PHI_NUM_ARGS (t); i++)
{
rhs = get_constraint_for (PHI_ARG_DEF (t, i));
rhs = get_constraint_for (PHI_ARG_DEF (t, i), NULL);
process_constraint (new_constraint (lhs, rhs));
}
}
@ -2816,7 +2821,7 @@ find_func_aliases (tree t, struct alias_info *ai)
|| ref_contains_indirect_ref (lhsop)
|| TREE_CODE (rhsop) == CALL_EXPR)
{
lhs = get_constraint_for (lhsop);
lhs = get_constraint_for (lhsop, NULL);
switch (TREE_CODE_CLASS (TREE_CODE (rhsop)))
{
/* RHS that consist of unary operations,
@ -2829,15 +2834,16 @@ find_func_aliases (tree t, struct alias_info *ai)
case tcc_expression:
case tcc_unary:
{
rhs = get_constraint_for (rhsop);
bool need_anyoffset = false;
rhs = get_constraint_for (rhsop, &need_anyoffset);
process_constraint (new_constraint (lhs, rhs));
/* When taking the address of an aggregate
type, from the LHS we can access any field
of the RHS. */
if (rhs.type == ADDRESSOF
if (need_anyoffset || (rhs.type == ADDRESSOF
&& !(get_varinfo (rhs.var)->is_special_var)
&& AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (rhsop))))
&& AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (rhsop)))))
{
rhs.var = anyoffset_id;
rhs.type = ADDRESSOF;
@ -2866,7 +2872,7 @@ find_func_aliases (tree t, struct alias_info *ai)
for (i = 0; i < TREE_CODE_LENGTH (TREE_CODE (rhsop)); i++)
{
tree op = TREE_OPERAND (rhsop, i);
rhs = get_constraint_for (op);
rhs = get_constraint_for (op, NULL);
process_constraint (new_constraint (lhs, rhs));
}
}