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Change typeid definition to be based around the canonical type hash

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`typeid` used to be a fancy index with extra metadata stored on it. Now it is direct hash of the type.

This is safe to do in practice since any possible collisions are checked at compile time AND the chances of having a 1% collision are around 1 in 600K (see the Birthday Paradox).

Therefore accessing a `^Type_Info` is now a hash table lookup with linear probing. The table is twice the size than necessary so prevent too much probing due to an overly dense hash table.
This commit is contained in:
gingerBill
2025-02-20 14:10:45 +00:00
parent c25ac939d4
commit 5489a88983
7 changed files with 65 additions and 112 deletions
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src/llvm_backend.cpp
+3 -2
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@@ -3154,9 +3154,10 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
lbModule *m = default_module;
{ // Add type info data
GB_ASSERT_MSG(info->minimum_dependency_type_info_index_map.count == info->type_info_types.count, "%tu vs %tu", info->minimum_dependency_type_info_index_map.count, info->type_info_types.count);
// GB_ASSERT_MSG(info->minimum_dependency_type_info_index_map.count == info->type_info_types.count, "%tu vs %tu", info->minimum_dependency_type_info_index_map.count, info->type_info_types.count);
isize max_type_info_count = info->minimum_dependency_type_info_index_map.count+1;
// isize max_type_info_count = info->minimum_dependency_type_info_index_map.count+1;
isize max_type_info_count = info->type_info_types_hash_map.count;
Type *t = alloc_type_array(t_type_info_ptr, max_type_info_count);
// IMPORTANT NOTE(bill): As LLVM does not have a union type, an array of unions cannot be initialized