static void
init_parameter_lattice_values (void)
{
tree parm;
for (parm = DECL_ARGUMENTS (cfun->decl); parm ; parm = TREE_CHAIN (parm))
if (is_complex_reg (parm) && var_ann (parm) != NULL)
{
tree ssa_name = default_def (parm);
VEC_replace (complex_lattice_t, complex_lattice_values,
SSA_NAME_VERSION (ssa_name), VARYING);
}
}
void
release_ssa_name (tree var)
{
if (!var)
return;
/* Never release the default definition for a symbol. It's a
special SSA name that should always exist once it's created. */
if (var == default_def (SSA_NAME_VAR (var)))
return;
/* If VAR has been registered for SSA updating, don't remove it.
After update_ssa has run, the name will be released. */
if (name_registered_for_update_p (var))
{
release_ssa_name_after_update_ssa (var);
return;
}
/* release_ssa_name can be called multiple times on a single SSA_NAME.
However, it should only end up on our free list one time. We
keep a status bit in the SSA_NAME node itself to indicate it has
been put on the free list.
Note that once on the freelist you can not reference the SSA_NAME's
defining statement. */
if (! SSA_NAME_IN_FREE_LIST (var))
{
tree saved_ssa_name_var = SSA_NAME_VAR (var);
int saved_ssa_name_version = SSA_NAME_VERSION (var);
use_operand_p imm = &(SSA_NAME_IMM_USE_NODE (var));
#ifdef ENABLE_CHECKING
verify_imm_links (stderr, var);
#endif
while (imm->next != imm)
delink_imm_use (imm->next);
VEC_replace (tree, ssa_names, SSA_NAME_VERSION (var), NULL_TREE);
memset (var, 0, tree_size (var));
imm->prev = imm;
imm->next = imm;
imm->stmt = var;
/* First put back the right tree node so that the tree checking
macros do not complain. */
TREE_SET_CODE (var, SSA_NAME);
/* Restore the version number. */
SSA_NAME_VERSION (var) = saved_ssa_name_version;
/* Hopefully this can go away once we have the new incremental
SSA updating code installed. */
SSA_NAME_VAR (var) = saved_ssa_name_var;
/* Note this SSA_NAME is now in the first list. */
SSA_NAME_IN_FREE_LIST (var) = 1;
/* And finally link it into the free list. */
TREE_CHAIN (var) = free_ssanames;
free_ssanames = var;
}
}
static bool
verify_use (basic_block bb, basic_block def_bb, use_operand_p use_p,
tree stmt, bool check_abnormal, bool is_virtual,
bitmap names_defined_in_bb)
{
bool err = false;
tree ssa_name = USE_FROM_PTR (use_p);
err = verify_ssa_name (ssa_name, is_virtual);
if (!TREE_VISITED (ssa_name))
if (verify_imm_links (stderr, ssa_name))
err = true;
TREE_VISITED (ssa_name) = 1;
if (IS_EMPTY_STMT (SSA_NAME_DEF_STMT (ssa_name))
&& default_def (SSA_NAME_VAR (ssa_name)) == ssa_name)
; /* Default definitions have empty statements. Nothing to do. */
else if (!def_bb)
{
error ("missing definition");
err = true;
}
else if (bb != def_bb
&& !dominated_by_p (CDI_DOMINATORS, bb, def_bb))
{
error ("definition in block %i does not dominate use in block %i",
def_bb->index, bb->index);
err = true;
}
else if (bb == def_bb
&& names_defined_in_bb != NULL
&& !bitmap_bit_p (names_defined_in_bb, SSA_NAME_VERSION (ssa_name)))
{
error ("definition in block %i follows the use", def_bb->index);
err = true;
}
if (check_abnormal
&& !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ssa_name))
{
error ("SSA_NAME_OCCURS_IN_ABNORMAL_PHI should be set");
err = true;
}
/* Make sure the use is in an appropriate list by checking the previous
element to make sure it's the same. */
if (use_p->prev == NULL)
{
error ("no immediate_use list");
err = true;
}
else
{
tree listvar ;
if (use_p->prev->use == NULL)
listvar = use_p->prev->stmt;
else
listvar = USE_FROM_PTR (use_p->prev);
if (listvar != ssa_name)
{
error ("wrong immediate use list");
err = true;
}
}
if (err)
{
fprintf (stderr, "for SSA_NAME: ");
print_generic_expr (stderr, ssa_name, TDF_VOPS);
fprintf (stderr, " in statement:\n");
print_generic_stmt (stderr, stmt, TDF_VOPS);
}
return err;
}
static unsigned int
get_rank (tree e)
{
operand_entry_t vr;
/* Constants have rank 0. */
if (is_gimple_min_invariant (e))
return 0;
/* SSA_NAME's have the rank of the expression they are the result
of.
For globals and uninitialized values, the rank is 0.
For function arguments, use the pre-setup rank.
For PHI nodes, stores, asm statements, etc, we use the rank of
the BB.
For simple operations, the rank is the maximum rank of any of
its operands, or the bb_rank, whichever is less.
I make no claims that this is optimal, however, it gives good
results. */
if (TREE_CODE (e) == SSA_NAME)
{
tree stmt;
tree rhs;
unsigned int rank, maxrank;
int i;
if (TREE_CODE (SSA_NAME_VAR (e)) == PARM_DECL
&& e == default_def (SSA_NAME_VAR (e)))
return find_operand_rank (e)->rank;
stmt = SSA_NAME_DEF_STMT (e);
if (bb_for_stmt (stmt) == NULL)
return 0;
if (TREE_CODE (stmt) != MODIFY_EXPR
|| !ZERO_SSA_OPERANDS (stmt, SSA_OP_VIRTUAL_DEFS))
return bb_rank[bb_for_stmt (stmt)->index];
/* If we already have a rank for this expression, use that. */
vr = find_operand_rank (e);
if (vr)
return vr->rank;
/* Otherwise, find the maximum rank for the operands, or the bb
rank, whichever is less. */
rank = 0;
maxrank = bb_rank[bb_for_stmt(stmt)->index];
rhs = TREE_OPERAND (stmt, 1);
if (TREE_CODE_LENGTH (TREE_CODE (rhs)) == 0)
rank = MAX (rank, get_rank (rhs));
else
{
for (i = 0;
i < TREE_CODE_LENGTH (TREE_CODE (rhs))
&& TREE_OPERAND (rhs, i)
&& rank != maxrank;
i++)
rank = MAX(rank, get_rank (TREE_OPERAND (rhs, i)));
}
if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file, "Rank for ");
print_generic_expr (dump_file, e, 0);
fprintf (dump_file, " is %d\n", (rank + 1));
}
/* Note the rank in the hashtable so we don't recompute it. */
insert_operand_rank (e, (rank + 1));
return (rank + 1);
}
/* Globals, etc, are rank 0 */
return 0;
}
