[Lldb-commits] [PATCH] D27632: Add Formatv() versions of all our printf style formatting functions

Greg Clayton via Phabricator via lldb-commits lldb-commits at lists.llvm.org
Fri Dec 9 16:02:57 PST 2016

clayborg added a comment.

It is nice to be able to use StringRef and std::string as is. I was wondering if you have:

  StringRef null;
  StringRef empty("");
  StringRef hello("hello")

What does this show:

  formatv("{0} {1} {2}", null, empty, hello);

I would hope for:

(null) "" "hello"

Where "(null)" is used for the empty StringRef since it doesn't have a value. This is what printf does if you pass nullptr in for a %s. The other string has a pointer, but no size, so it should show the empty string. Also for std::string and for StringRef if would be great if we can show binary values since a StringRef and std::string can contain NULL characters and also non printable characters. One option that would be really cool for both StringRef and std::string would be the memory view stuff we did a month back! So we could do:

  StringRef bytes("\x01\x02\x03");
  formatv("{0:memory}", bytes);

And get out a memory dump.

Comment at: source/Target/Target.cpp:1558-1559
+        error.SetErrorStringWithFormatv(
+            "{0}[{1:x+}] can't be resolved, {0} is not currently loaded",
+            resolved_addr.GetFileAddress());
Can we add lldb_private::FileSpec support with this patch as well? Then the code can be:

            "{0}[{1:x+}] can't be resolved, {0;filename} is not currently loaded",
            addr_module_sp->GetFileSpec(), resolved_addr.GetFileAddress());


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