Unify lex_cast* and avoid string copies

We always use lex_cast either to string or from string, so I made that
explicit, and got rid of some string copies in the process.  There was
also stringify(), which was redundant to lex_cast<string>.

We also always used lex_cast_hex to string, so that's now hard-coded and
again eliminated a string copy.

For lex_cast_qstring<string>, there's no need to write the streamify the
input, so a specialization now operates directly on the input.

Hopefully this is a bit cleaner, and I do measure it to be a little
faster on scripts with many probes.

1 files changed, 2 insertions, 2 deletions

diff --git a/main.cxx b/main.cxx
index b97d0092..d8c780c2 100644
--- a/main.cxx
+++ b/main.cxx
@@ -486,8 +486,8 @@ main (int argc, char * const argv [])
 
   s.buffer_size = 0;
   s.last_pass = 5;
-  s.module_name = "stap_" + stringify(getpid());
-  s.stapconf_name = "stapconf_" + stringify(getpid()) + ".h";
+  s.module_name = "stap_" + lex_cast(getpid());
+  s.stapconf_name = "stapconf_" + lex_cast(getpid()) + ".h";
   s.output_file = ""; // -o FILE
   s.keep_tmpdir = false;
   s.cmd = "";