> On Mar 14, 2018, at 8:22 PM, Florin Trofin via lldb-dev
> <lldb-dev@lists.llvm.org> wrote:
>
> Hi,
>
> I came across the formatter example in unicode_strings.py where in
> utf16_summary() I see this code:
>
> string_data = value.process.ReadMemory(pointer, length, error)
> # utf8 is safe to emit as-is on OSX
> return '"%s"' % (string_data.decode('utf-16').encode('utf-8'))
>
> I am trying to replicate that in my own formatter and I'm having difficulty
> converting the pointer to an addr_t which is what ReadMemory wants. In my
> case pointer comes from:
>
> self.rep.GetChildMemberWithName("__l").GetChildMemberWithName("__data_")
>
> (this is a basic_string which has a union:
> struct __rep
> {
> union {
> __long __l; // Used for long strings
> __short __s; // Used for short strings - stores in place
> __raw __r; // ??
> };
> };
>
> and __long is defined as:
>
> struct __long {
> pointer __data_;
> size_type __size_;
> size_type __cap_;
> };
>
> So __data_ is a basic_string::pointer (plain C pointer).
>
> How do I convert this pointer to the addr_t that I need? I believe that the
> GetChildMemberWithName returns an SBValue. I tried pointer.GetPointeeData(0,
> 1).GetLoadAddress() but I'm not getting the corect results.
__data_ will contain the pointer value. Just do:
pointer.GetValueAsUnsigned()
>
> Thanks!
>
> Florin
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