ptr WIP

src/frontend/target.h

@@ -78,6 +78,13 @@ namespace dbgui::frontend
 			}
 		};
 
+		struct ExprCacheEntry
+		{
+			std::string expr_path;
+			size_t id;
+			bool used_this_frame = false;
+		};
+
 		Target(std::string filename);
 
 		std::optional<uint16_t> data_idx_for_src_id(size_t id)
@@ -108,6 +115,29 @@ namespace dbgui::frontend
 			return &*data_res_nodes[*idx];
 		}
 
+		size_t find_or_create_expr_path(std::string &&path)
+		{
+			for (auto &entry : expr_cache)
+			{
+				if (entry.expr_path == path)
+				{
+					entry.used_this_frame = true;
+					return entry.id;
+				}
+			}
+
+			using namespace data::source;
+			auto id = this->id++;
+			this->backend->add_data_node(
+			  Node{.id   = id,
+			       .type = Node::Type::source,
+			       .data = Source{.type = Source::Type::variable,
+			                      .data = Source::Variable{.expr_path = path}}});
+			expr_cache.push_back(ExprCacheEntry{
+			  .expr_path = std::move(path), .id = id, .used_this_frame = true});
+			return id;
+		}
+
 		TargetState state = TargetState::stopped;
 		std::string filename;
 		uint64_t id;
@@ -124,6 +154,7 @@ namespace dbgui::frontend
 		std::vector<std::pair<size_t, uint16_t>> src_id_to_data_idx;
 		std::vector<std::optional<data::result::Node>> data_res_nodes;
 		std::vector<data::type_info::TypeInfo> types;
+		std::vector<ExprCacheEntry> expr_cache;
 
 		std::shared_ptr<backend::Backend> backend = nullptr;
 	};