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Implement IdString garbage collection instead of refcounting.

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This commit is contained in:
Robert O'Callahan 2025-10-10 01:10:33 +00:00
parent b3f79ed8e7
commit bc7895505e
6 changed files with 272 additions and 90 deletions
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30
kernel/register.cc
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@ -42,6 +42,23 @@ std::map<std::string, Backend*> backend_register;
std::vector<std::string> Frontend::next_args;
bool GarbageCollectionGuard::is_enabled_ = true;
static bool garbage_collection_requested = false;
void request_garbage_collection()
{
garbage_collection_requested = true;
}
void try_collect_garbage()
{
if (!GarbageCollectionGuard::is_enabled() || !garbage_collection_requested)
return;
garbage_collection_requested = false;
RTLIL::OwningIdString::collect_garbage();
}
Pass::Pass(std::string name, std::string short_help, source_location location) :
pass_name(name), short_help(short_help), location(location)
{
@ -263,14 +280,19 @@ void Pass::call(RTLIL::Design *design, std::vector<std::string> args)
if (pass_register.count(args[0]) == 0)
log_cmd_error("No such command: %s (type 'help' for a command overview)\n", args[0]);
Pass *pass = pass_register[args[0]];
if (pass_register[args[0]]->experimental_flag)
// Collect garbage before the next pass if requested. No need to collect garbage after the last pass.
try_collect_garbage();
GarbageCollectionGuard gc_guard(pass->allow_garbage_collection_during_pass());
if (pass->experimental_flag)
log_experimental(args[0]);
size_t orig_sel_stack_pos = design->selection_stack.size();
auto state = pass_register[args[0]]->pre_execute();
pass_register[args[0]]->execute(args, design);
pass_register[args[0]]->post_execute(state);
auto state = pass->pre_execute();
pass->execute(args, design);
pass->post_execute(state);
while (design->selection_stack.size() > orig_sel_stack_pos)
design->pop_selection();
}