add basic array sizing with constant size, tho the parsing is probably not correct

this should just be a normal array index
also missing handling to correctly construct the expr path when accessing pointers
(maybe just make this node based in the future?)

src/backend/lldb/lldb_backend.cpp

@@ -143,9 +143,11 @@ void LLDBBackend::handle_state_change(lldb::StateType state)
 	{
 		spdlog::trace("Got initial state change: {}", static_cast<uint32_t>(state));
 
-		if (state != lldb::StateType::eStateStopped) {
+		if (state != lldb::StateType::eStateStopped)
+		{
 			// TODO: handle other stopped states, e.g. crashed
-			spdlog::trace("Not handling initial state {}", static_cast<uint32_t>(state));
+			spdlog::trace("Not handling initial state {}",
+			              static_cast<uint32_t>(state));
 			return;
 		}
 
@@ -286,8 +288,8 @@ void LLDBBackend::prepare_proc_info(
 	}
 
 	auto frame      = _process->GetThreadAtIndex(0).GetFrameAtIndex(0);
-	/*const auto regs = frame.GetRegisters();
-	const auto len = regs.GetSize();
+	const auto regs = frame.GetRegisters();
+	/*const auto len = regs.GetSize();
 	for (size_t i = 0; i < len; ++i) {
 			auto reg_or_set = regs.GetValueAtIndex(i);
 			if (reg_or_set.GetValueType() == eValueTypeRegister) {
@@ -1530,6 +1532,29 @@ void LLDBBackend::add_data_node(const data::source::Node &node)
 			_data_dag.add_edge(node.id, src_id);
 			break;
 		}
+		case read_array:
+		{
+			const auto &arr_node = std::get<data::source::ReadAsArray>(node.data);
+			auto src_id          = arr_node.addr_src_id;
+			if (!_data_dag.nodes.contains(src_id))
+			{
+				printf("Invalid add sequence\n");
+				exit(1);
+			}
+			_data_dag.add_edge(node.id, src_id);
+
+			if (!arr_node.is_const_size)
+			{
+				auto size_id = arr_node.size_src_id;
+				if (!_data_dag.nodes.contains(size_id))
+				{
+					printf("Invalid add sequence\n");
+					exit(1);
+				}
+				_data_dag.add_edge(node.id, size_id);
+			}
+			break;
+		}
 	}
 
 	_dag_linear_valid = false;
@@ -1681,6 +1706,7 @@ std::optional<std::pair<uint16_t, size_t>>
 			}
 		}
 
+		// TODO: reserve the slot
 		auto idx = this->_data_res.size();
 		this->_data_res.resize(idx + 1);
 		return idx;
@@ -2292,6 +2318,121 @@ std::optional<std::pair<uint16_t, size_t>>
 			                     .success = true,
 			                     .data    = std::move(buf)});
 		}
+		case read_array:
+		{
+			using namespace lldb;
+			uint16_t cache_idx = 0;
+			if (auto found_idx = find_node_for_src_id(node.id); found_idx)
+			{
+				cache_idx = *found_idx;
+			} else
+			{
+				cache_idx = get_free_res_slot();
+				// reserve the slot
+				_data_res[cache_idx] = CachedDataRes{.src_id = node.id};
+			}
+
+			const auto &arr_node = std::get<data::source::ReadAsArray>(node.data);
+			auto res_node        = data::result::Node{
+			         .idx     = cache_idx,
+			         .type_id = data::type_info::TypeID::none(),
+			         .success = false,
+      };
+
+			size_t addr_id           = arr_node.addr_src_id;
+			uint16_t addr_parent_idx = *find_node_for_src_id(addr_id);
+			if (!_data_res[addr_parent_idx]
+			    || !_data_res[addr_parent_idx]->node.success
+			    || _data_res[addr_parent_idx]->node.children.size() != 1)
+			{
+				return check_single_res_changed(std::move(res_node));
+			}
+
+			uint16_t addr_idx = _data_res[addr_parent_idx]->node.children[0];
+
+			if (!_data_res[addr_idx] || !_data_res[addr_idx]->node.success
+			    || _data_res[addr_idx]->node.type_id.type
+			         != data::type_info::Type::ptr)
+			{
+				return check_single_res_changed(std::move(res_node));
+			}
+
+			if (!arr_node.is_const_size)
+			{
+				spdlog::trace("read_as_array: non-const size not supported");
+				return check_single_res_changed(std::move(res_node));
+			}
+
+			const auto addr = _data_res[addr_idx]->node.get_primitive<uint64_t>(0);
+			spdlog::trace("read_as_array: addr: {:X}", addr);
+
+			const auto pointee_type_idx = _data_res[addr_idx]->node.type_id.idx;
+			if (!_types[pointee_type_idx])
+			{
+				spdlog::trace("Found no pointee type for read_as_array");
+				return check_single_res_changed(std::move(res_node));
+			}
+
+			auto pointee_type = _types[pointee_type_idx]->first;
+			if (pointee_type.IsArrayType())
+			{
+				// TODO: should we do this until there is no array left?
+				pointee_type = pointee_type.GetArrayElementType();
+			}
+			spdlog::trace("read_as_array: pointee_type valid?: {}",
+			              pointee_type.IsValid());
+
+			std::string type_buf;
+			format_type(pointee_type, type_buf);
+			spdlog::trace("read_as_array: pointee_type: {}", type_buf);
+
+			auto arr_type = pointee_type.GetArrayType(arr_node.size_const);
+
+			spdlog::trace("read_as_array: arr_type valid?: {}", arr_type.IsValid());
+			type_buf.clear();
+			format_type(arr_type, type_buf);
+			spdlog::trace("read_as_array: arr_type: {}", type_buf);
+
+			char buf[128], buf2[32];
+			/*std::snprintf(buf2, sizeof(buf2), "%zX", node.id);
+			std::snprintf(buf, sizeof(buf), "*((%s *)0x%zX)", arr_type.GetName(),
+			              addr);
+			auto arr_val = _target.CreateValueFromExpression(buf2, buf);
+			if (!arr_val.IsValid())
+			{
+				spdlog::trace("read_as_array: arr_val not valid");
+				return check_single_res_changed(std::move(res_node));
+			}*/
+			std::snprintf(buf, sizeof(buf), "(char*)0x%zX", addr);
+			auto tmp_val = _target.CreateValueFromExpression("arr_tmp", buf);
+			if (!tmp_val.IsValid())
+			{
+				spdlog::trace("read_as_array: tmp_val not valid");
+				return check_single_res_changed(std::move(res_node));
+			}
+
+			std::snprintf(buf, sizeof(buf), "%zX", node.id);
+			auto arr_val = tmp_val.CreateValueFromAddress(buf, addr, arr_type);
+			if (!arr_val.IsValid())
+			{
+				spdlog::trace("read_as_array: arr_val not valid");
+				return check_single_res_changed(std::move(res_node));
+			}
+			//arr_val = arr_val.Cast(arr_type);
+
+			auto res_idx = this->build_nodes_for_var(arr_val, data_res, false);
+			if (!res_idx)
+			{
+				return check_single_res_changed(std::move(res_node));
+			}
+
+			spdlog::trace(
+			  "Got res for {}: {} ({})", node.id, *res_idx,
+			  static_cast<uint8_t>(_data_res[*res_idx]->node.type_id.type));
+			res_node.success = true;
+			res_node.children.push_back(*res_idx);
+			return check_single_res_changed(std::move(res_node));
+		}
 	}
 
 	printf("Unhandled data type\n");

src/data.h

@@ -355,6 +355,15 @@ namespace dbgui::data
 			size_t src_id;
 		};
 
+		struct ReadAsArray {
+			size_t addr_src_id;
+			union {
+				size_t size_src_id;
+				uint64_t size_const;
+			};
+			bool is_const_size;
+		};
+
 		struct Node
 		{
 			enum class Type : uint8_t
@@ -364,12 +373,13 @@ namespace dbgui::data
 				line_entry,
 				locals,
 				read_cstr,
+				read_array,
 			};
 
 			size_t id;
 			Type type;
 			// when adding something here, remember to update LLDBBackend::add_data_node
-			std::variant<std::monostate, Source, Disassemble, LineEntry, ReadAsCStr>
+			std::variant<std::monostate, Source, Disassemble, LineEntry, ReadAsCStr, ReadAsArray>
 			  data;
 		};
 	}  // namespace source

src/frontend/window/watch_window.cpp

@@ -4,6 +4,7 @@
 #include "imgui_internal.h"
 #include <fstream>
 #include <filesystem>
+#include <charconv>
 
 using namespace dbgui;
 using namespace dbgui::frontend;
@@ -818,6 +819,9 @@ namespace
 		return token;
 	}
 
+	std::optional<size_t> parse_array_desc_inner(ParseState& state, size_t addr_src_id);
+
+
 	// <data desc> = <data desc>.<data desc> | <array desc> | <ident> | <reg>
 	std::optional<size_t> parse_data_desc(ParseState &state)
 	{
@@ -917,6 +921,27 @@ namespace
 		}
 		state.path_buf.append(ident);
 
+		const auto create_var_node = [&](bool address_of) -> size_t {
+			spdlog::trace("Parsing data_desc: creating variable source (address?: {}) with path {}",
+										address_of, state.path_buf);
+			auto node_id = state.frontend->target->data_node_id++;
+			state.nodes.push_back(data::source::Node{
+				.id   = node_id,
+				.type = data::source::Node::Type::source,
+				.data =
+				data::source::Source{
+					.type = data::source::Source::Type::variable,
+					.data =
+					data::source::Source::Variable{
+						.expr_path             = state.path_buf,
+						.address_of_or_pointer = address_of,
+					},
+				},
+			});
+			state.path_buf.clear();
+			return node_id;
+		};
+
 		// differentiate between <data desc>, <array desc> and end of <data desc>
 		const auto peek_token_opt = peek_token(state);
 		if (peek_token_opt)
@@ -934,30 +959,85 @@ namespace
 
 			if (peek_token == WatchToken::bracket_open)
 			{
-				// TODO: parse <array desc>
-				assert(0);
-				return {};
+				// parse <array desc>
+				// consume token
+				next_token(state);
+				const auto src_node = create_var_node(true);
+				const auto res = parse_array_desc_inner(state, src_node);
+				if (!res) {
+					return res;
+				}
+
+				// we expect a closing bracket
+				const auto closing_opt = next_token(state);
+				if (!closing_opt) {
+					spdlog::trace("Failed to parse data_desc: Expected closing bracket in array_desc but got none");
+					return {};
+				}
+
+				if (*closing_opt != WatchToken::bracket_close) {
+					spdlog::trace("Failed to parse data_desc: Expected closing bracket in array_desc but got {}", token_to_str(state, *closing_opt));
+					return {};
+				}
+
+				return res;
 			}
 		}
 
-		spdlog::trace("Parsing data_desc: creating variable source with path {}",
-		              state.path_buf);
 		// something else, end of <data desc>
-		auto node_id = state.frontend->target->data_node_id++;
-		state.nodes.push_back(data::source::Node{
-		  .id   = node_id,
-		  .type = data::source::Node::Type::source,
-		  .data =
-		    data::source::Source{
-		      .type = data::source::Source::Type::variable,
-		      .data =
-		        data::source::Source::Variable{
-		          .expr_path             = state.path_buf,
-		          .address_of_or_pointer = false,
-		        },
-		    },
-		});
+		return create_var_node(false);
+	}
 
+	// <array desc> = <ident>\[<arrsize spec>|<arrpath>\]
+	std::optional<size_t> parse_array_desc_inner(ParseState& state, size_t addr_src_id) {
+		// the bracket has already been consumed by the caller
+		spdlog::trace("Parsing array_desc_inner");
+
+		// for now only support constant sized arrays
+		const auto peek_opt = peek_token(state);
+		if (!peek_opt) {
+			spdlog::trace("Failed to parse array_desc_inner: end of token");
+			return {};
+		}
+
+		const auto peek_token = *peek_opt;
+		if (!token_is_literal(peek_token)) {
+			spdlog::trace("Failed to parse array_desc_inner: Expected literal but got {}", token_to_str(state, peek_token));
+			return {};
+		}
+
+		// consume
+		next_token(state);
+
+		auto literal = token_literal(state, peek_token);
+		spdlog::trace("Parsing array_desc_inner: Got literal {}", literal);
+
+		int base = 10;
+		if (literal.starts_with("0x")) {
+			base = 16;
+			literal.remove_prefix(2);
+		}
+		uint64_t size = 0;
+
+		const auto parse_res = std::from_chars(literal.begin(), literal.end(), size, base);
+		if (parse_res.ec != std::errc{} || parse_res.ptr != literal.end()) {
+			spdlog::trace("Failed parsing array_desc_inner: Literal is not a number");
+			return {};
+		}
+
+		auto node_id = state.frontend->target->data_node_id++;
+		spdlog::trace("Parsing array_desc_inner: creating read_as_array with size {} and id {}",
+									size, node_id);
+		state.nodes.push_back(data::source::Node{
+			.id   = node_id,
+			.type = data::source::Node::Type::read_array,
+			.data =
+			data::source::ReadAsArray{
+		      .addr_src_id = addr_src_id,
+		      .size_const = size,
+		      .is_const_size = true,
+			},
+		});
 		return node_id;
 	}
 }  // namespace