static void ungroup_proc_params(tree_t t, group_nets_ctx_t *ctx)
{
// Ungroup any signal that is passed to a procedure as in general we
// cannot guarantee anything about the procedure's behaviour
const int nparams = tree_params(t);
for (int i = 0; i < nparams; i++) {
tree_t value = tree_value(tree_param(t, i));
tree_kind_t kind = tree_kind(value);
while (kind == T_ARRAY_REF || kind == T_ARRAY_SLICE) {
value = tree_value(value);
kind = tree_kind(value);
}
if (kind != T_REF)
continue;
tree_t decl = tree_ref(value);
if (tree_kind(decl) != T_SIGNAL_DECL)
continue;
const int nnets = tree_nets(decl);
for (int i = 0; i < nnets; i++)
group_add(ctx, tree_net(decl, i), 1);
}
}
static void opt_elide_array_ref_bounds(tree_t t)
{
tree_t value = tree_value(t);
if (tree_kind(value) != T_REF)
return;
tree_t decl = tree_ref(value);
const int nparams = tree_params(t);
for (int i = 0; i < nparams; i++) {
tree_t index = tree_value(tree_param(t, i));
if (tree_kind(index) != T_REF)
return;
tree_t index_decl = tree_ref(index);
tree_t range_var = tree_attr_tree(index_decl, range_var_i);
if (range_var == NULL)
return;
if (range_var != decl)
return;
}
tree_add_attr_int(t, elide_bounds_i, 1);
}
static void opt_tag_last_value_fcall(tree_t t)
{
tree_t decl = tree_ref(t);
if (tree_attr_str(decl, builtin_i) != NULL)
return;
// A regular subprogram call may pass parameters as class signal which
// could access 'LAST_VALUE in the body
const int nports = tree_ports(decl);
for (int i = 0; i < nports; i++) {
tree_t port = tree_port(decl, i);
if (tree_class(port) != C_SIGNAL)
continue;
tree_t value = tree_value(tree_param(t, i));
tree_kind_t kind;
while ((kind = tree_kind(value)) != T_REF) {
assert((kind == T_ARRAY_REF) || (kind == T_ARRAY_SLICE));
value = tree_value(value);
}
tree_add_attr_int(tree_ref(value), last_value_i, 1);
}
}
static tree_t rewrite_refs(tree_t t, void *context)
{
rewrite_params_t *params = context;
if (tree_kind(t) != T_REF)
return t;
tree_t decl = tree_ref(t);
for (int i = 0; i < params->count; i++) {
if (decl != params->formals[i])
continue;
// Do not rewrite references if they appear as formal names
if (tree_attr_int(t, formal_i, 0))
continue;
// Skip assignments to OPEN ports
if (params->actuals[i] == NULL)
continue;
switch (tree_kind(params->actuals[i])) {
case T_SIGNAL_DECL:
case T_ENUM_LIT:
tree_set_ref(t, params->actuals[i]);
tree_set_type(t, tree_type(params->actuals[i]));
return t;
case T_LITERAL:
case T_AGGREGATE:
case T_REF:
case T_ARRAY_SLICE:
case T_ARRAY_REF:
case T_FCALL:
case T_CONCAT:
return params->actuals[i];
case T_TYPE_CONV:
// XXX: this only works in trivial cases
return tree_value(tree_param(params->actuals[i], 0));
default:
fatal_at(tree_loc(params->actuals[i]), "cannot handle tree kind %s "
"in rewrite_refs",
tree_kind_str(tree_kind(params->actuals[i])));
}
}
return t;
}
static bool group_name(tree_t target, group_nets_ctx_t *ctx, int start, int n)
{
switch (tree_kind(target)) {
case T_REF:
group_ref(target, ctx, start, n);
return true;
case T_ARRAY_REF:
{
tree_t value = tree_value(target);
type_t type = tree_type(value);
if (type_is_unconstrained(type))
return false;
int offset = 0;
const int nparams = tree_params(target);
for (int i = 0; i < nparams; i++) {
tree_t index = tree_value(tree_param(target, i));
const int stride = type_width(type_elem(type));
if (tree_kind(index) != T_LITERAL) {
if (i > 0)
return false;
const int twidth = type_width(type);
for (int j = 0; j < twidth; j += stride)
group_name(value, ctx, start + j, n);
return true;
}
else {
if (i > 0) {
range_t type_r = range_of(type, i);
int64_t low, high;
range_bounds(type_r, &low, &high);
offset *= high - low + 1;
}
offset += stride * rebase_index(type, i, assume_int(index));
}
}
return group_name(value, ctx, start + offset, n);
}
case T_ARRAY_SLICE:
{
tree_t value = tree_value(target);
type_t type = tree_type(value);
if (type_is_unconstrained(type))
return false; // Only in procedure
range_t slice = tree_range(target, 0 );
if (tree_kind(slice.left) != T_LITERAL
|| tree_kind(slice.right) != T_LITERAL)
return false;
int64_t low, high;
range_bounds(slice, &low, &high);
const int64_t low0 = rebase_index(type, 0, assume_int(slice.left));
const int stride = type_width(type_elem(type));
return group_name(value, ctx, start + low0 * stride, n);
}
case T_RECORD_REF:
{
tree_t value = tree_value(target);
type_t rec = tree_type(value);
const int offset = record_field_to_net(rec, tree_ident(target));
return group_name(value, ctx, start + offset, n);
}
case T_AGGREGATE:
case T_LITERAL:
// This can appear due to assignments to open ports with a
// default value
return true;
default:
fatal_at(tree_loc(target), "tree kind %s not yet supported for offset "
"calculation", tree_kind_str(tree_kind(target)));
}
}
static tree_t elab_signal_port(tree_t arch, tree_t formal, tree_t param,
map_list_t **maps)
{
assert(tree_kind(param) == T_PARAM);
tree_t actual = tree_value(param);
// NULL name means associate the whole port
tree_t name = NULL;
if (tree_subkind(param) == P_NAMED) {
tree_t n = tree_name(param);
if (tree_kind(n) != T_REF)
name = n;
}
const bool partial_map = name != NULL;
switch (tree_kind(actual)) {
case T_REF:
case T_ARRAY_REF:
case T_ARRAY_SLICE:
case T_RECORD_REF:
{
// Replace the formal port with a signal and connect its nets to
// those of the actual
tree_t ref = actual;
tree_kind_t ref_kind;
while ((ref_kind = tree_kind(ref)) != T_REF) {
if ((ref_kind == T_AGGREGATE) || (ref_kind == T_LITERAL))
return actual;
else
ref = tree_value(ref);
}
tree_t decl = tree_ref(ref);
tree_kind_t decl_kind = tree_kind(decl);
if (decl_kind == T_SIGNAL_DECL) {
tree_t s = elab_port_to_signal(arch, formal, actual);
if (partial_map)
tree_add_attr_int(s, partial_map_i, 1);
map_list_t *m = xmalloc(sizeof(map_list_t));
m->next = *maps;
m->formal = formal;
m->actual = actual;
m->signal = s;
m->name = name;
*maps = m;
return s;
}
else if (decl_kind == T_PORT_DECL)
return NULL; // Port was OPEN at a higher level
else
return actual;
}
case T_LITERAL:
case T_AGGREGATE:
{
type_t formal_type = tree_type(formal);
if (!type_is_unconstrained(formal_type))
tree_set_type(actual, formal_type);
return actual;
}
case T_OPEN:
return NULL;
case T_TYPE_CONV:
// Only allow simple array type conversions for now
{
type_t to_type = tree_type(actual);
type_t from_type = tree_type(tree_value(tree_param(actual, 0)));
if (type_is_array(to_type) && type_is_array(from_type))
return actual;
else
fatal_at(tree_loc(actual), "sorry, this form of type conversion "
"is not supported as an actual");
}
default:
fatal_at(tree_loc(actual), "tree %s not supported as actual",
tree_kind_str(tree_kind(actual)));
}
}