cppdbg throws "Unable to find child property"

まず Variables ウィンドウを非表示にした状態でシーケンスを再現し、次に cppdbg デバッガーアダプター内の dataBreakpointInfo リクエストと関連する evaluate 呼び出しを調べます。提供された GDB/MI ログを使って、空の式と子プロパティの検索を追跡します。dataBreakpointInfo がエラーを生成しなくなり、監視対象項目のコンテキストメニューが表示されれば完了です。

Environment

Version: 1.106.0-insider (user setup)
Commit: 18d828e5d596e56b516fac7baa53e4b32cf087be
Date: 2025-11-04T05:03:04.572Z
Electron: 37.7.0
ElectronBuildId: 12597478
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Windows_NT x64 10.0.26200

Bug Summary and Steps to Reproduce

Bug Summary:
The cppdbg debugger adapter throws "Unable to find child property."
Refer: https://github.com/microsoft/vscode/issues/273721

Steps to reproduce:

1. in vscode, open a c++ project
2. set a breakpoint and start debugging to hit that
3. hide the 'Variables' window
4. reload the vscode
5. start debugging again, add an variable in watch, right on the watched item.
   the context menu doesn't show up due to the dataBreakpointInfo() call into cppdbg debugger adapter throws "Unable to find child property.

Debugger Configurations

{
	"version": "0.2.0",
	"configurations": [
		{
			"name": "(gdb) Launch",
			"type": "cppdbg",
			"request": "launch",
			"program": "${workspaceFolder}/out",
			"args": [],
			"stopAtEntry": false,
			"cwd": "${workspaceFolder}",
			"environment": [],
			"externalConsole": false,
			"MIMode": "gdb",
			"setupCommands": [
				{
					"description": "Enable pretty-printing for gdb",
					"text": "-enable-pretty-printing",
					"ignoreFailures": true
				}
			]
		}
	]
}

Debugger Logs

<--   C (evaluate-18): {"command":"evaluate","arguments":{"expression":"","frameId":1000,"context":"hover","line":15,"column":0,"source":{"name":"main.cpp","path":"c:\\Users\\brchen\\repos\\test-cpp\\src\\main.cpp","sources":[],"checksums":[]}},"type":"request","seq":18}
--> E (output): {"type":"event","event":"output","body":{"category":"console","output":"1: (4390) <-1030-var-create  - * \"\"\r\n"},"seq":690}
1: (4390) <-1030-var-create  - * ""
--> E (output): {"type":"event","event":"output","body":{"category":"console","output":"1: (4399) ->1030^error,msg=\"-var-create: unable to create variable object\"\r\n"},"seq":692}
1: (4399) ->1030^error,msg="-var-create: unable to create variable object"
--> E (output): {"type":"event","event":"output","body":{"category":"console","output":"1: (4399) 1030: elapsed time 9\r\n"},"seq":694}
1: (4399) 1030: elapsed time 9
--> E (output): {"type":"event","event":"output","body":{"category":"console","output":"1: (4399) ->(gdb)\r\n"},"seq":696}
1: (4399) ->(gdb)
--> E (output): {"type":"event","event":"output","body":{"category":"console","output":"1: (4400) ->&\"\\n\"\r\n"},"seq":698}
1: (4400) ->&"\n"
--> E (output): {"type":"event","event":"output","body":{"category":"console","output":"1: (4400) ->^done\r\n"},"seq":700}
1: (4400) ->^done
--> E (output): {"type":"event","event":"output","body":{"category":"console","output":"1: (4400) ->(gdb)\r\n"},"seq":702}
1: (4400) ->(gdb)
--> R (evaluate-18): {"type":"response","request_seq":18,"success":false,"command":"evaluate","message":"Evaluation error","body":{},"seq":704}
<--   C (dataBreakpointInfo-19): {"command":"dataBreakpointInfo","arguments":{"name":"s.x","frameId":1000},"type":"request","seq":19}
--> R (dataBreakpointInfo-19): {"type":"response","request_seq":19,"success":false,"command":"dataBreakpointInfo","message":"Unable to get info for data breakpoint. Unable to find child property.","body":{},"seq":707}

Other Extensions

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Additional Information

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