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tree-ssa-structalias.c (readonly_id): Rename to string_id.

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2014-08-15  Richard Biener  <rguenther@suse.de>

	* tree-ssa-structalias.c (readonly_id): Rename to string_id.
	(get_constraint_for_ssa_var): Remove dead code.
	(get_constraint_for_1): Adjust.
	(find_what_var_points_to): Likewise.
	(init_base_vars): Likewise.  STRING_CSTs do not contain pointers.

From-SVN: r214020
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Richard Biener 2014-08-15 12:54:28 +00:00 • committed by Richard Biener
parent 275be1dac2
commit ebd7d91067
2 changed files with 26 additions and 35 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2014-08-15 Richard Biener <rguenther@suse.de>
* tree-ssa-structalias.c (readonly_id): Rename to string_id.
(get_constraint_for_ssa_var): Remove dead code.
(get_constraint_for_1): Adjust.
(find_what_var_points_to): Likewise.
(init_base_vars): Likewise. STRING_CSTs do not contain pointers.
2014-08-15 Ilya Tocar <tocarip@gmail.com>
PR target/61878

53
gcc/tree-ssa-structalias.c
View file

@ -344,7 +344,7 @@ vi_next (varinfo_t vi)
/* Static IDs for the special variables. Variable ID zero is unused
and used as terminator for the sub-variable chain. */
enum { nothing_id = 1, anything_id = 2, readonly_id = 3,
enum { nothing_id = 1, anything_id = 2, string_id = 3,
escaped_id = 4, nonlocal_id = 5,
storedanything_id = 6, integer_id = 7 };
@ -2938,14 +2938,6 @@ get_constraint_for_ssa_var (tree t, vec<ce_s> *results, bool address_p)
cexpr.var = vi->id;
cexpr.type = SCALAR;
cexpr.offset = 0;
/* If we determine the result is "anything", and we know this is readonly,
say it points to readonly memory instead. */
if (cexpr.var == anything_id && TREE_READONLY (t))
{
gcc_unreachable ();
cexpr.type = ADDRESSOF;
cexpr.var = readonly_id;
}
/* If we are not taking the address of the constraint expr, add all
sub-fiels of the variable as well. */
@ -3380,10 +3372,11 @@ get_constraint_for_1 (tree t, vec<ce_s> *results, bool address_p,
return;
}
/* String constants are read-only. */
/* String constants are read-only, ideally we'd have a CONST_DECL
for those. */
if (TREE_CODE (t) == STRING_CST)
{
temp.var = readonly_id;
temp.var = string_id;
temp.type = SCALAR;
temp.offset = 0;
results->safe_push (temp);
@ -6112,8 +6105,8 @@ find_what_var_points_to (varinfo_t orig_vi)
else if (vi->is_heap_var)
/* We represent heapvars in the points-to set properly. */
;
else if (vi->id == readonly_id)
/* Nobody cares. */
else if (vi->id == string_id)
/* Nobody cares - STRING_CSTs are read-only entities. */
;
else if (vi->id == anything_id
|| vi->id == integer_id)
@ -6501,7 +6494,7 @@ init_base_vars (void)
struct constraint_expr lhs, rhs;
varinfo_t var_anything;
varinfo_t var_nothing;
varinfo_t var_readonly;
varinfo_t var_string;
varinfo_t var_escaped;
varinfo_t var_nonlocal;
varinfo_t var_storedanything;
@ -6547,27 +6540,17 @@ init_base_vars (void)
but this one are redundant. */
constraints.safe_push (new_constraint (lhs, rhs));
/* Create the READONLY variable, used to represent that a variable
points to readonly memory. */
var_readonly = new_var_info (NULL_TREE, "READONLY");
gcc_assert (var_readonly->id == readonly_id);
var_readonly->is_artificial_var = 1;
var_readonly->offset = 0;
var_readonly->size = ~0;
var_readonly->fullsize = ~0;
var_readonly->is_special_var = 1;
/* readonly memory points to anything, in order to make deref
easier. In reality, it points to anything the particular
readonly variable can point to, but we don't track this
separately. */
lhs.type = SCALAR;
lhs.var = readonly_id;
lhs.offset = 0;
rhs.type = ADDRESSOF;
rhs.var = readonly_id; /* FIXME */
rhs.offset = 0;
process_constraint (new_constraint (lhs, rhs));
/* Create the STRING variable, used to represent that a variable
points to a string literal. String literals don't contain
pointers so STRING doesn't point to anything. */
var_string = new_var_info (NULL_TREE, "STRING");
gcc_assert (var_string->id == string_id);
var_string->is_artificial_var = 1;
var_string->offset = 0;
var_string->size = ~0;
var_string->fullsize = ~0;
var_string->is_special_var = 1;
var_string->may_have_pointers = 0;
/* Create the ESCAPED variable, used to represent the set of escaped
memory. */