tree
gfc_conv_string_init (tree length, gfc_expr * expr)
{
gfc_char_t *s;
HOST_WIDE_INT len;
int slen;
tree str;
bool free_s = false;
gcc_assert (expr->expr_type == EXPR_CONSTANT);
gcc_assert (expr->ts.type == BT_CHARACTER);
gcc_assert (tree_fits_uhwi_p (length));
len = TREE_INT_CST_LOW (length);
slen = expr->value.character.length;
if (len > slen)
{
s = gfc_get_wide_string (len);
memcpy (s, expr->value.character.string, slen * sizeof (gfc_char_t));
gfc_wide_memset (&s[slen], ' ', len - slen);
free_s = true;
}
else
s = expr->value.character.string;
str = gfc_build_wide_string_const (expr->ts.kind, len, s);
if (free_s)
free (s);
return str;
}
static unsigned short
get_ubsan_type_info_for_type (tree type)
{
gcc_assert (TYPE_SIZE (type) && tree_fits_uhwi_p (TYPE_SIZE (type)));
int prec = exact_log2 (tree_to_uhwi (TYPE_SIZE (type)));
gcc_assert (prec != -1);
return (prec << 1) | !TYPE_UNSIGNED (type);
}
static unsigned HOST_WIDE_INT
alloc_object_size (const gcall *call, int object_size_type)
{
tree callee, bytes = NULL_TREE;
tree alloc_size;
int arg1 = -1, arg2 = -1;
gcc_assert (is_gimple_call (call));
callee = gimple_call_fndecl (call);
if (!callee)
return unknown[object_size_type];
alloc_size = lookup_attribute ("alloc_size",
TYPE_ATTRIBUTES (TREE_TYPE (callee)));
if (alloc_size && TREE_VALUE (alloc_size))
{
tree p = TREE_VALUE (alloc_size);
arg1 = TREE_INT_CST_LOW (TREE_VALUE (p))-1;
if (TREE_CHAIN (p))
arg2 = TREE_INT_CST_LOW (TREE_VALUE (TREE_CHAIN (p)))-1;
}
if (DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL)
switch (DECL_FUNCTION_CODE (callee))
{
case BUILT_IN_CALLOC:
arg2 = 1;
/* fall through */
case BUILT_IN_MALLOC:
case BUILT_IN_ALLOCA:
case BUILT_IN_ALLOCA_WITH_ALIGN:
arg1 = 0;
default:
break;
}
if (arg1 < 0 || arg1 >= (int)gimple_call_num_args (call)
|| TREE_CODE (gimple_call_arg (call, arg1)) != INTEGER_CST
|| (arg2 >= 0
&& (arg2 >= (int)gimple_call_num_args (call)
|| TREE_CODE (gimple_call_arg (call, arg2)) != INTEGER_CST)))
return unknown[object_size_type];
if (arg2 >= 0)
bytes = size_binop (MULT_EXPR,
fold_convert (sizetype, gimple_call_arg (call, arg1)),
fold_convert (sizetype, gimple_call_arg (call, arg2)));
else if (arg1 >= 0)
bytes = fold_convert (sizetype, gimple_call_arg (call, arg1));
if (bytes && tree_fits_uhwi_p (bytes))
return tree_to_uhwi (bytes);
return unknown[object_size_type];
}
/* Initialize OFFSET_LIMIT variable. */
static void
init_offset_limit (void)
{
if (tree_fits_uhwi_p (TYPE_MAX_VALUE (sizetype)))
offset_limit = tree_to_uhwi (TYPE_MAX_VALUE (sizetype));
else
offset_limit = -1;
offset_limit /= 2;
}
static bool
get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp)
{
/* Verify the arg number is a constant. */
if (!tree_fits_uhwi_p (arg_num_expr))
return false;
*valp = TREE_INT_CST_LOW (arg_num_expr);
return true;
}
static unsigned short
get_ubsan_type_info_for_type (tree type)
{
gcc_assert (TYPE_SIZE (type) && tree_fits_uhwi_p (TYPE_SIZE (type)));
if (TREE_CODE (type) == REAL_TYPE)
return tree_to_uhwi (TYPE_SIZE (type));
else if (INTEGRAL_TYPE_P (type))
{
int prec = exact_log2 (tree_to_uhwi (TYPE_SIZE (type)));
gcc_assert (prec != -1);
return (prec << 1) | !TYPE_UNSIGNED (type);
}
else
return 0;
}
static bool
try_unroll_loop_completely (struct loop *loop,
edge exit, tree niter,
enum unroll_level ul,
HOST_WIDE_INT maxiter,
location_t locus)
{
unsigned HOST_WIDE_INT n_unroll = 0, ninsns, unr_insns;
struct loop_size size;
bool n_unroll_found = false;
edge edge_to_cancel = NULL;
int report_flags = MSG_OPTIMIZED_LOCATIONS | TDF_RTL | TDF_DETAILS;
/* See if we proved number of iterations to be low constant.
EXIT is an edge that will be removed in all but last iteration of
the loop.
EDGE_TO_CACNEL is an edge that will be removed from the last iteration
of the unrolled sequence and is expected to make the final loop not
rolling.
If the number of execution of loop is determined by standard induction
variable test, then EXIT and EDGE_TO_CANCEL are the two edges leaving
from the iv test. */
if (tree_fits_uhwi_p (niter))
{
n_unroll = tree_to_uhwi (niter);
n_unroll_found = true;
edge_to_cancel = EDGE_SUCC (exit->src, 0);
if (edge_to_cancel == exit)
edge_to_cancel = EDGE_SUCC (exit->src, 1);
}
/* We do not know the number of iterations and thus we can not eliminate
the EXIT edge. */
else
exit = NULL;
/* See if we can improve our estimate by using recorded loop bounds. */
if (maxiter >= 0
&& (!n_unroll_found || (unsigned HOST_WIDE_INT)maxiter < n_unroll))
{
n_unroll = maxiter;
n_unroll_found = true;
/* Loop terminates before the IV variable test, so we can not
remove it in the last iteration. */
edge_to_cancel = NULL;
}
if (!n_unroll_found)
return false;
if (n_unroll > (unsigned) PARAM_VALUE (PARAM_MAX_COMPLETELY_PEEL_TIMES))
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Not unrolling loop %d "
"(--param max-completely-peeled-times limit reached).\n",
loop->num);
return false;
}
if (!edge_to_cancel)
edge_to_cancel = loop_edge_to_cancel (loop);
if (n_unroll)
{
sbitmap wont_exit;
edge e;
unsigned i;
bool large;
vec<edge> to_remove = vNULL;
if (ul == UL_SINGLE_ITER)
return false;
large = tree_estimate_loop_size
(loop, exit, edge_to_cancel, &size,
PARAM_VALUE (PARAM_MAX_COMPLETELY_PEELED_INSNS));
ninsns = size.overall;
if (large)
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Not unrolling loop %d: it is too large.\n",
loop->num);
return false;
}
unr_insns = estimated_unrolled_size (&size, n_unroll);
if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file, " Loop size: %d\n", (int) ninsns);
fprintf (dump_file, " Estimated size after unrolling: %d\n",
(int) unr_insns);
}
/* If the code is going to shrink, we don't need to be extra cautious
on guessing if the unrolling is going to be profitable. */
if (unr_insns
/* If there is IV variable that will become constant, we save
one instruction in the loop prologue we do not account
otherwise. */
<= ninsns + (size.constant_iv != false))
;
/* We unroll only inner loops, because we do not consider it profitable
otheriwse. We still can cancel loopback edge of not rolling loop;
this is always a good idea. */
else if (ul == UL_NO_GROWTH)
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Not unrolling loop %d: size would grow.\n",
loop->num);
return false;
}
/* Outer loops tend to be less interesting candidates for complete
unrolling unless we can do a lot of propagation into the inner loop
body. For now we disable outer loop unrolling when the code would
grow. */
else if (loop->inner)
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Not unrolling loop %d: "
"it is not innermost and code would grow.\n",
loop->num);
return false;
}
/* If there is call on a hot path through the loop, then
there is most probably not much to optimize. */
else if (size.num_non_pure_calls_on_hot_path)
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Not unrolling loop %d: "
"contains call and code would grow.\n",
loop->num);
return false;
}
/* If there is pure/const call in the function, then we
can still optimize the unrolled loop body if it contains
some other interesting code than the calls and code
storing or cumulating the return value. */
else if (size.num_pure_calls_on_hot_path
/* One IV increment, one test, one ivtmp store
and one useful stmt. That is about minimal loop
doing pure call. */
&& (size.non_call_stmts_on_hot_path
<= 3 + size.num_pure_calls_on_hot_path))
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Not unrolling loop %d: "
"contains just pure calls and code would grow.\n",
loop->num);
return false;
}
/* Complette unrolling is major win when control flow is removed and
one big basic block is created. If the loop contains control flow
the optimization may still be a win because of eliminating the loop
overhead but it also may blow the branch predictor tables.
Limit number of branches on the hot path through the peeled
sequence. */
else if (size.num_branches_on_hot_path * (int)n_unroll
> PARAM_VALUE (PARAM_MAX_PEEL_BRANCHES))
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Not unrolling loop %d: "
" number of branches on hot path in the unrolled sequence"
" reach --param max-peel-branches limit.\n",
loop->num);
return false;
}
else if (unr_insns
> (unsigned) PARAM_VALUE (PARAM_MAX_COMPLETELY_PEELED_INSNS))
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Not unrolling loop %d: "
"(--param max-completely-peeled-insns limit reached).\n",
loop->num);
return false;
}
dump_printf_loc (report_flags, locus,
"loop turned into non-loop; it never loops.\n");
initialize_original_copy_tables ();
wont_exit = sbitmap_alloc (n_unroll + 1);
bitmap_ones (wont_exit);
bitmap_clear_bit (wont_exit, 0);
if (!gimple_duplicate_loop_to_header_edge (loop, loop_preheader_edge (loop),
n_unroll, wont_exit,
exit, &to_remove,
DLTHE_FLAG_UPDATE_FREQ
| DLTHE_FLAG_COMPLETTE_PEEL))
{
free_original_copy_tables ();
free (wont_exit);
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Failed to duplicate the loop\n");
return false;
}
FOR_EACH_VEC_ELT (to_remove, i, e)
{
bool ok = remove_path (e);
gcc_assert (ok);
}
to_remove.release ();
free (wont_exit);
free_original_copy_tables ();
}
static unsigned HOST_WIDE_INT
addr_object_size (struct object_size_info *osi, const_tree ptr,
int object_size_type)
{
tree pt_var, pt_var_size = NULL_TREE, var_size, bytes;
gcc_assert (TREE_CODE (ptr) == ADDR_EXPR);
pt_var = TREE_OPERAND (ptr, 0);
while (handled_component_p (pt_var))
pt_var = TREE_OPERAND (pt_var, 0);
if (pt_var
&& TREE_CODE (pt_var) == MEM_REF)
{
unsigned HOST_WIDE_INT sz;
if (!osi || (object_size_type & 1) != 0
|| TREE_CODE (TREE_OPERAND (pt_var, 0)) != SSA_NAME)
{
sz = compute_builtin_object_size (TREE_OPERAND (pt_var, 0),
object_size_type & ~1);
}
else
{
tree var = TREE_OPERAND (pt_var, 0);
if (osi->pass == 0)
collect_object_sizes_for (osi, var);
if (bitmap_bit_p (computed[object_size_type],
SSA_NAME_VERSION (var)))
sz = object_sizes[object_size_type][SSA_NAME_VERSION (var)];
else
sz = unknown[object_size_type];
}
if (sz != unknown[object_size_type])
{
offset_int dsz = wi::sub (sz, mem_ref_offset (pt_var));
if (wi::neg_p (dsz))
sz = 0;
else if (wi::fits_uhwi_p (dsz))
sz = dsz.to_uhwi ();
else
sz = unknown[object_size_type];
}
if (sz != unknown[object_size_type] && sz < offset_limit)
pt_var_size = size_int (sz);
}
else if (pt_var
&& DECL_P (pt_var)
&& tree_fits_uhwi_p (DECL_SIZE_UNIT (pt_var))
&& tree_to_uhwi (DECL_SIZE_UNIT (pt_var)) < offset_limit)
pt_var_size = DECL_SIZE_UNIT (pt_var);
else if (pt_var
&& TREE_CODE (pt_var) == STRING_CST
&& TYPE_SIZE_UNIT (TREE_TYPE (pt_var))
&& tree_fits_uhwi_p (TYPE_SIZE_UNIT (TREE_TYPE (pt_var)))
&& tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (pt_var)))
< offset_limit)
pt_var_size = TYPE_SIZE_UNIT (TREE_TYPE (pt_var));
else
return unknown[object_size_type];
if (pt_var != TREE_OPERAND (ptr, 0))
{
tree var;
if (object_size_type & 1)
{
var = TREE_OPERAND (ptr, 0);
while (var != pt_var
&& TREE_CODE (var) != BIT_FIELD_REF
&& TREE_CODE (var) != COMPONENT_REF
&& TREE_CODE (var) != ARRAY_REF
&& TREE_CODE (var) != ARRAY_RANGE_REF
&& TREE_CODE (var) != REALPART_EXPR
&& TREE_CODE (var) != IMAGPART_EXPR)
var = TREE_OPERAND (var, 0);
if (var != pt_var && TREE_CODE (var) == ARRAY_REF)
var = TREE_OPERAND (var, 0);
if (! TYPE_SIZE_UNIT (TREE_TYPE (var))
|| ! tree_fits_uhwi_p (TYPE_SIZE_UNIT (TREE_TYPE (var)))
|| (pt_var_size
&& tree_int_cst_lt (pt_var_size,
TYPE_SIZE_UNIT (TREE_TYPE (var)))))
var = pt_var;
else if (var != pt_var && TREE_CODE (pt_var) == MEM_REF)
{
tree v = var;
/* For &X->fld, compute object size only if fld isn't the last
field, as struct { int i; char c[1]; } is often used instead
of flexible array member. */
while (v && v != pt_var)
switch (TREE_CODE (v))
{
case ARRAY_REF:
if (TYPE_SIZE_UNIT (TREE_TYPE (TREE_OPERAND (v, 0)))
&& TREE_CODE (TREE_OPERAND (v, 1)) == INTEGER_CST)
{
tree domain
= TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (v, 0)));
if (domain
&& TYPE_MAX_VALUE (domain)
&& TREE_CODE (TYPE_MAX_VALUE (domain))
== INTEGER_CST
&& tree_int_cst_lt (TREE_OPERAND (v, 1),
TYPE_MAX_VALUE (domain)))
{
v = NULL_TREE;
break;
}
}
v = TREE_OPERAND (v, 0);
break;
case REALPART_EXPR:
case IMAGPART_EXPR:
v = NULL_TREE;
break;
case COMPONENT_REF:
if (TREE_CODE (TREE_TYPE (v)) != ARRAY_TYPE)
{
v = NULL_TREE;
break;
}
while (v != pt_var && TREE_CODE (v) == COMPONENT_REF)
if (TREE_CODE (TREE_TYPE (TREE_OPERAND (v, 0)))
!= UNION_TYPE
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (v, 0)))
!= QUAL_UNION_TYPE)
break;
else
v = TREE_OPERAND (v, 0);
if (TREE_CODE (v) == COMPONENT_REF
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (v, 0)))
== RECORD_TYPE)
{
tree fld_chain = DECL_CHAIN (TREE_OPERAND (v, 1));
for (; fld_chain; fld_chain = DECL_CHAIN (fld_chain))
if (TREE_CODE (fld_chain) == FIELD_DECL)
break;
if (fld_chain)
{
v = NULL_TREE;
break;
}
v = TREE_OPERAND (v, 0);
}
while (v != pt_var && TREE_CODE (v) == COMPONENT_REF)
if (TREE_CODE (TREE_TYPE (TREE_OPERAND (v, 0)))
!= UNION_TYPE
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (v, 0)))
!= QUAL_UNION_TYPE)
break;
else
v = TREE_OPERAND (v, 0);
if (v != pt_var)
v = NULL_TREE;
else
v = pt_var;
break;
default:
v = pt_var;
break;
}
if (v == pt_var)
var = pt_var;
}
}
else
var = pt_var;
if (var != pt_var)
var_size = TYPE_SIZE_UNIT (TREE_TYPE (var));
else if (!pt_var_size)
return unknown[object_size_type];
else
var_size = pt_var_size;
bytes = compute_object_offset (TREE_OPERAND (ptr, 0), var);
if (bytes != error_mark_node)
{
if (TREE_CODE (bytes) == INTEGER_CST
&& tree_int_cst_lt (var_size, bytes))
bytes = size_zero_node;
else
bytes = size_binop (MINUS_EXPR, var_size, bytes);
}
if (var != pt_var
&& pt_var_size
&& TREE_CODE (pt_var) == MEM_REF
&& bytes != error_mark_node)
{
tree bytes2 = compute_object_offset (TREE_OPERAND (ptr, 0), pt_var);
if (bytes2 != error_mark_node)
{
if (TREE_CODE (bytes2) == INTEGER_CST
&& tree_int_cst_lt (pt_var_size, bytes2))
bytes2 = size_zero_node;
else
bytes2 = size_binop (MINUS_EXPR, pt_var_size, bytes2);
bytes = size_binop (MIN_EXPR, bytes, bytes2);
}
}
}
else if (!pt_var_size)
return unknown[object_size_type];
else
bytes = pt_var_size;
if (tree_fits_uhwi_p (bytes))
return tree_to_uhwi (bytes);
return unknown[object_size_type];
}
