[clang] [llvm] [clang][DebugInfo] Add symbol for debugger with VTable information. (PR #130255)

[Carlos Alberto Enciso via llvm-commits]

CarlosAlbertoEnciso wrote:

@clayborg Thanks very much for the extra information.

> FYI: There is already VTable support in our lldb::SBValue class and it is part of the public API in LLDB and doesn't require any of this:
> 
> ```
> $ cat main.cpp
>    1   	#include <stdio.h>
>    2   	
>    3   	class Foo {
>    4   	public:
>    5   	  virtual ~Foo() = default;
>    6   	  virtual void Dump() {
>    7   	    puts(__PRETTY_FUNCTION__);
>    8   	  }
>    9   	};
>    10  	
>    11  	int main(int argc, const char **argv) {
>    12  	  Foo f;
>    13  	  f.Dump();
>    14  	  return 0;
>    15  	}
> ```
> 
> Then when you debug:
> 
> ```
> (lldb) script
> Python Interactive Interpreter. To exit, type 'quit()', 'exit()' or Ctrl-D.
> >>> v = lldb.frame.FindVariable('f')
> >>> v.GetVTable()
> vtable for Foo = 0x0000000100004030 {
>   [0] = 0x0000000100003ea4 a.out`Foo::~Foo() at main.cpp:5
>   [1] = 0x0000000100003ef4 a.out`Foo::~Foo() at main.cpp:5
>   [2] = 0x0000000100003e7c a.out`Foo::Dump() at main.cpp:6
> }
> ```
> 
> Doesn't require any debug info.

Just a question: Can that functionality be used before the object is constructed?

https://github.com/llvm/llvm-project/pull/130255