[Lldb-commits] [lldb] [llvm] [lldb-dap] Support column breakpoints (PR #113787)

[Adrian Vogelsgesang via lldb-commits]

================
@@ -910,6 +911,183 @@ void request_attach(const llvm::json::Object &request) {
   }
 }
 
+// "BreakpointLocationsRequest": {
+//   "allOf": [ { "$ref": "#/definitions/Request" }, {
+//     "type": "object",
+//     "description": "The `breakpointLocations` request returns all possible
+//     locations for source breakpoints in a given range.\nClients should only
+//     call this request if the corresponding capability
+//     `supportsBreakpointLocationsRequest` is true.",
+//     "properties": {
+//       "command": {
+//         "type": "string",
+//         "enum": [ "breakpointLocations" ]
+//       },
+//       "arguments": {
+//         "$ref": "#/definitions/BreakpointLocationsArguments"
+//       }
+//     },
+//     "required": [ "command" ]
+//   }]
+// },
+// "BreakpointLocationsArguments": {
+//   "type": "object",
+//   "description": "Arguments for `breakpointLocations` request.",
+//   "properties": {
+//     "source": {
+//       "$ref": "#/definitions/Source",
+//       "description": "The source location of the breakpoints; either
+//       `source.path` or `source.sourceReference` must be specified."
+//     },
+//     "line": {
+//       "type": "integer",
+//       "description": "Start line of range to search possible breakpoint
+//       locations in. If only the line is specified, the request returns all
+//       possible locations in that line."
+//     },
+//     "column": {
+//       "type": "integer",
+//       "description": "Start position within `line` to search possible
+//       breakpoint locations in. It is measured in UTF-16 code units and the
+//       client capability `columnsStartAt1` determines whether it is 0- or
+//       1-based. If no column is given, the first position in the start line is
+//       assumed."
+//     },
+//     "endLine": {
+//       "type": "integer",
+//       "description": "End line of range to search possible breakpoint
+//       locations in. If no end line is given, then the end line is assumed to
+//       be the start line."
+//     },
+//     "endColumn": {
+//       "type": "integer",
+//       "description": "End position within `endLine` to search possible
+//       breakpoint locations in. It is measured in UTF-16 code units and the
+//       client capability `columnsStartAt1` determines whether it is 0- or
+//       1-based. If no end column is given, the last position in the end line
+//       is assumed."
+//     }
+//   },
+//   "required": [ "source", "line" ]
+// },
+// "BreakpointLocationsResponse": {
+//   "allOf": [ { "$ref": "#/definitions/Response" }, {
+//     "type": "object",
+//     "description": "Response to `breakpointLocations` request.\nContains
+//     possible locations for source breakpoints.",
+//     "properties": {
+//       "body": {
+//         "type": "object",
+//         "properties": {
+//           "breakpoints": {
+//             "type": "array",
+//             "items": {
+//               "$ref": "#/definitions/BreakpointLocation"
+//             },
+//             "description": "Sorted set of possible breakpoint locations."
+//           }
+//         },
+//         "required": [ "breakpoints" ]
+//       }
+//     },
+//     "required": [ "body" ]
+//   }]
+// },
+// "BreakpointLocation": {
+//   "type": "object",
+//   "description": "Properties of a breakpoint location returned from the
+//   `breakpointLocations` request.",
+//   "properties": {
+//     "line": {
+//       "type": "integer",
+//       "description": "Start line of breakpoint location."
+//     },
+//     "column": {
+//       "type": "integer",
+//       "description": "The start position of a breakpoint location. Position
+//       is measured in UTF-16 code units and the client capability
+//       `columnsStartAt1` determines whether it is 0- or 1-based."
+//     },
+//     "endLine": {
+//       "type": "integer",
+//       "description": "The end line of breakpoint location if the location
+//       covers a range."
+//     },
+//     "endColumn": {
+//       "type": "integer",
+//       "description": "The end position of a breakpoint location (if the
+//       location covers a range). Position is measured in UTF-16 code units and
+//       the client capability `columnsStartAt1` determines whether it is 0- or
+//       1-based."
+//     }
+//   },
+//   "required": [ "line" ]
+// },
+void request_breakpointLocations(const llvm::json::Object &request) {
+  llvm::json::Object response;
+  FillResponse(request, response);
+  auto *arguments = request.getObject("arguments");
+  auto *source = arguments->getObject("source");
+  std::string path = GetString(source, "path").str();
+  uint64_t start_line = GetUnsigned(arguments, "line", 0);
+  uint64_t start_column = GetUnsigned(arguments, "column", 0);
+  uint64_t end_line = GetUnsigned(arguments, "endLine", start_line);
+  uint64_t end_column =
+      GetUnsigned(arguments, "endColumn", std::numeric_limits<uint64_t>::max());
+
+  lldb::SBFileSpec file_spec(path.c_str(), true);
+  lldb::SBSymbolContextList compile_units =
+      g_dap.target.FindCompileUnits(file_spec);
+
+  // Find all relevant lines & columns
+  llvm::SmallVector<std::pair<uint32_t, uint32_t>, 8> locations;
+  for (uint32_t c_idx = 0, c_limit = compile_units.GetSize(); c_idx < c_limit;
+       ++c_idx) {
+    const lldb::SBCompileUnit &compile_unit =
+        compile_units.GetContextAtIndex(c_idx).GetCompileUnit();
+    if (!compile_units.IsValid())
+      continue;
+
+    // Go through the line table and find all matching lines / columns
+    for (uint32_t l_idx = 0, l_limit = compile_unit.GetNumLineEntries();
+         l_idx < l_limit; ++l_idx) {
+      lldb::SBLineEntry line_entry = compile_unit.GetLineEntryAtIndex(l_idx);
----------------
vogelsgesang wrote:

> What's the largest file you've tested it on?

20 lines 🙈 

https://github.com/llvm/llvm-project/pull/113787