cpp_typecheck_namespace.cpp

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/*******************************************************************\
 
Module: C++ Language Type Checking
 
Author: Daniel Kroening, kroening@cs.cmu.edu
 
\*******************************************************************/

 
#include <util/source_location.h>
#include <util/symbol_table_base.h>
 
#include "cpp_typecheck.h"
 
void cpp_typecheckt::convert(cpp_namespace_spect &namespace_spec)
{
  // save the scope
  cpp_save_scopet saved_scope(cpp_scopes);
 
  const irep_idt &name=namespace_spec.get_namespace();
 
  if(name.empty())
  {
    // "unique namespace"
    error().source_location=namespace_spec.source_location();
    error() << "unique namespace not supported yet" << eom;
    throw 0;
  }
 
  irep_idt final_name(name);
 
  std::string identifier=
    cpp_scopes.current_scope().prefix+id2string(final_name);
 
  symbol_table_baset::symbolst::const_iterator it =
    symbol_table.symbols.find(identifier);
 
  if(it!=symbol_table.symbols.end())
  {
    if(namespace_spec.alias().is_not_nil())
    {
      error().source_location=namespace_spec.source_location();
      error() << "namespace alias '" << final_name << "' previously declared\n"
              << "location of previous declaration: " << it->second.location
              << eom;
      throw 0;
    }
 
    if(it->second.type.id()!=ID_namespace)
    {
      error().source_location=namespace_spec.source_location();
      error() << "namespace '" << final_name << "' previously declared\n"
              << "location of previous declaration: " << it->second.location
              << eom;
      throw 0;
    }
 
    // enter that scope
    cpp_scopes.set_scope(it->first);
  }
  else
  {
    symbolt symbol{identifier, typet(ID_namespace), ID_cpp};
    symbol.base_name=final_name;
    symbol.location=namespace_spec.source_location();
    symbol.module=module;
 
    if(!symbol_table.insert(std::move(symbol)).second)
    {
      error().source_location=symbol.location;
      error() << "cpp_typecheckt::convert_namespace: symbol_table.move() failed"
              << eom;
      throw 0;
    }
 
    cpp_scopes.new_namespace(final_name);
  }
 
  if(namespace_spec.alias().is_not_nil())
  {
    cpp_typecheck_resolvet resolver(*this);
    cpp_scopet &s=resolver.resolve_namespace(namespace_spec.alias());
    cpp_scopes.current_scope().add_using_scope(s);
  }
  else
  {
    // do the declarations
    for(auto &item : namespace_spec.items())
      convert(item);
  }
}