Added the ability to get error strings back from failed

lldb_private::RegularExpression compiles and matches with:

    size_t
    RegularExpression::GetErrorAsCString (char *err_str, 
                                          size_t err_str_max_len) const;
    
Added the ability to search a variable list for variables whose names match
a regular expression:

    size_t
    VariableList::AppendVariablesIfUnique (const RegularExpression& regex, 
                                           VariableList &var_list, 
                                           size_t& total_matches);


Also added the ability to append a variable to a VariableList only if it is 
not already in the list:

    bool
    VariableList::AddVariableIfUnique (const lldb::VariableSP &var_sp);

Cleaned up the "frame variable" command:
- Removed the "-n NAME" option as this is the default way for the command to
  work.
- Enable uniqued regex searches on variable names by fixing the "--regex RE"
  command to work correctly. It will match all variables that match any
  regular expressions and only print each variable the first time it matches.
- Fixed the option type for the "--regex" command to by eArgTypeRegularExpression
  instead of eArgTypeCount

llvm-svn: 116178

1 files changed, 15 insertions, 0 deletions

diff --git a/lldb/source/Core/RegularExpression.cpp b/lldb/source/Core/RegularExpression.cpp
index b632c2eb0b0..45ed9cc6374 100644
--- a/lldb/source/Core/RegularExpression.cpp
+++ b/lldb/source/Core/RegularExpression.cpp
@@ -153,3 +153,18 @@ RegularExpression::Free()
         m_comp_err = 1;
     }
 }
+
+size_t
+RegularExpression::GetErrorAsCString (char *err_str, size_t err_str_max_len) const
+{
+    if (m_comp_err == 0)
+    {
+        if (err_str && err_str_max_len) 
+            *err_str = '\0';
+        return 0;
+    }
+    
+    return ::regerror (m_comp_err, &m_preg, err_str, err_str_max_len);
+}
+
+