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rtlil: add per-Design src meta vector + freelist

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This commit is contained in:
Emil J. Tywoniak 2026-06-05 13:36:53 +02:00
parent 29ab42bc4e
commit 9ed93e210b
2 changed files with 36 additions and 0 deletions
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20
kernel/rtlil.cc
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@ -1078,6 +1078,26 @@ namespace {
}
}
uint32_t RTLIL::Design::alloc_obj_meta()
{
if (!obj_meta_free_.empty()) {
uint32_t idx = obj_meta_free_.back();
obj_meta_free_.pop_back();
obj_meta_src_[idx] = Twine::Null;
return idx;
}
uint32_t idx = static_cast<uint32_t>(obj_meta_src_.size());
obj_meta_src_.push_back(Twine::Null);
return idx;
}
void RTLIL::Design::free_obj_meta(uint32_t idx)
{
log_assert(idx < obj_meta_src_.size());
log_assert(obj_meta_src_[idx] == Twine::Null);
obj_meta_free_.push_back(idx);
}
void RTLIL::Design::merge_src(RTLIL::AttrObject *target, const RTLIL::AttrObject *source)
{
std::vector<Twine::Id> ids;

16
kernel/rtlil.h
View file

@ -1993,6 +1993,22 @@ struct RTLIL::Design
// via cell->module->design->src_twines.
TwinePool src_twines;
// Per-object src metadata, indexed by AttrObject::meta_idx_. Holds the
// Twine::Id for an object's src — the future home of any other per-
// object cold metadata we want to evacuate from inline storage (e.g.
// name once IdString/Twine unify). Freed slots are recycled via
// obj_meta_free_ (LIFO), mirroring TwinePool's freelist.
//
// alloc_obj_meta returns a fresh index whose entry is Twine::Null;
// free_obj_meta requires the slot's src_id to already have been
// released via src_twines.release() — the freelist only handles
// the index itself, not the referenced pool slot.
std::vector<Twine::Id> obj_meta_src_;
std::vector<uint32_t> obj_meta_free_;
uint32_t alloc_obj_meta();
void free_obj_meta(uint32_t idx);
// Resolve a stored src-attribute string to its flat path:line.col
// representation. If `raw` is a twine reference ("@N") returns
// src_twines.flatten(N); otherwise returns `raw` unchanged. Backends