Allow enumeration of variables without fetching values
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调研方向
从现有的 variables requests 和提议的 VariablesArguments 属性开始，然后检查 Scope 在协议中的表示方式。该 issue 没有指定文件或测试；完成这项工作需要就一个无需获取变量值即可枚举变量的 API 达成一致，并决定是否应在变量视图中隐藏较大的 Scope。
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描述
We are currently investigating features for a debugger for embedded applications that would significantly benefit from mechanisms to enumerate global variables and file static variables of a C/C++ program. Maybe also functions in future.
A lot of what we'd need is already available with variables requests. But I can't find a way to explicitly configure to skip fetching the variable value. This would be important for our embedded use case. We often see applications with lots of global variables. But more importantly, even a moderate number of global variables can mean many target accesses which can be expensive and impact performance if you are using a JTAG debugger.
Would a new VariablesArguments property to skip reading values make sense? Or an entirely new API function for symbol/variable enumeration without fetching values?
Also, thinking about the huge number of global variables that can be returned, it could make sense to put them into a Scope that has a flag marking it as "do-not-show" in a variables window/GUI. Navigating the huge number of variables may not be practical. But you may still want to list them and their properties in other views and send them for example to a Watch window.
I was briefly thinking into the direction of using a language server for the enumeration. But in our experience, you better rely on the debugger/debug adapter to be the single source of truth of what really exists in the debug information/symbol tables of the debugged application.
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