[lldb-dev] --top-level doesn't work in lldb for Objective-C or Swift :(

[Rex Fenley via lldb-dev]

Jim,

That doesn't seem to work for us. We're using lldb packaged with Xcode 8
fyi.

(lldb) expr --top-level -- NSString *string = [NSString
stringWithUTF8String: "This is a string"];


; Function Attrs: nounwind

define internal void @_GLOBAL__sub_I__null_() #0 section
"__TEXT,__StaticInit,regular,pure_instructions" {

  call void @__cxx_global_var_init()

  ret void

}

On Tue, Oct 4, 2016 at 4:09 PM, Jim Ingham <jingham at apple.com> wrote:

> This isn't an issue with ObjC support in general, but rather shows that
> ObjC string constants are odd beasts.  You can work around this pretty
> easily by making dynamic strings:
>
> (lldb) expr --top-level -- NSString *string = [NSString
> stringWithUTF8String: "This is a string"];
> (lldb) expr string
> (__NSCFString *) $0 = 0x00000001002001b0 @"This is a string"
>
> Please file a bug about the problem with ObjC constant strings.
>
> Jim
>
>
> > On Oct 4, 2016, at 3:57 PM, Rex Fenley via lldb-dev <
> lldb-dev at lists.llvm.org> wrote:
> >
> > Hey lldb team!
> >
> > I'm trying to use `expr --top-level` from lldb in Xcode but it throws
> errors like the following:
> >
> > (lldb) expression --top-level -- NSString *str = @"This is a string";
> > Error [IRForTarget]: Couldn't replace an Objective-C constant string
> with a dynamic string
> > error: cannot import unsupported AST node ObjCStringLiteral
> > error: The expression could not be prepared to run in the target
> >
> > It seems like top-level only supports raw C code and not Objective-C. Is
> there an option we can set to support this? Is there somewhere in lldb's
> source code that could help point us to fixing this?
> >
> > Thank you, you guys rule!
> >
> > --
> > Rex Fenley  |  IOS DEVELOPER
> >
> >
> > Remind.com |  BLOG  |  FOLLOW US  |  LIKE US
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>
>


-- 

Rex Fenley  |  IOS DEVELOPER

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