So be sure to enable -fno-limit-debug-info to make sure the compiler isn't
emitting lame debug info.
If things are still failing, check to see what we think "CG::Node" contains by
dumping the type info for it:
(lldb) image lookup -t CG::Node
This will print out the complete class definition that we have for "CG::Node"
including ivars and methods. You should be able to see the inheritance
structure and you might need to also dump the type info for each inherited
class.
Compilers have been trying to not output a bunch of debug info and in the
process they started to omit class info for base classes. So if you have:
class A : public B
{
};
where class "B" has all sorts of interesting methods, the debug info will often
look like:
class B; // Forward declaration for class B
class A : public B
{
};
When this happens, we must make class A in a clang::ASTContext in
DWARFASTParserClang and if "B" is a forward declaration, we can't leave it as a
forward declaration or clang will assert and kill the debugger, so currently we
just say "oh well, the compiler gave us lame debug info, and clang will crash
if we don't fix this, so I am going to pretend we have a definition for class B
and it contains nothing".
I really don't like that the compiler thinks this is OK to do, but that is the
reality and we have to deal with it.
So the best thing I can offer it you must use -fno-limit-debug-info when
compiling to stop the compiler from doing this and things should be back to
normal for you. If this isn't what is happening, let us know what the "image
lookup -t" output looks like and we can see what we can do.
Greg Clayton
> On Nov 25, 2015, at 10:00 AM, Ramkumar Ramachandra via lldb-dev
> <lldb-dev@lists.llvm.org> wrote:
>
> Hi,
>
> Basic things are failing.
>
> (lldb) p lhs
> (CG::VarExpr *) $0 = 0x000000010d445ca0
> (lldb) p lhs->rootStmt()
> (CG::ExprStmt *) $1 = 0x000000010d446290
> (lldb) p cg_pp_see_it(lhs->rootStmt())
> (const char *) $2 = 0x000000010d448020 "%A = $3;"
> (lldb) p cg_pp_see_it(def->rootStmt())
> error: no member named 'rootStmt' in 'CG::Node'
> error: 1 errors parsing expression
> (lldb) p cg_pp_see_it(def)
> error: no matching function for call to 'cg_pp_see_it'
> note: candidate function not viable: no known conversion from
> 'CG::Node *' to 'CG_Obj *' for 1st argument
> error: 1 errors parsing expression
>
> It's total junk; why can't it see the inheritance VarExpr -> Node ->
> CG_Obj? The worst part is that rootStmt() is a function defined on
> Node!
>
> Ram
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