// be_codegen.h,v 1.85 2003/01/03 00:19:52 parsons Exp
/* -*- c++ -*- */
// ================================================================
//
// = LIBRARY
//    TAO_IDL_BE
//
// = FILENAME
//    be_codegen.h
//
// = DESCRIPTION
//   The Code generator class
//
// = AUTHOR
//    Aniruddha Gokhale
//
// ================================================================

#ifndef TAO_BE_CODEGEN_H
#define TAO_BE_CODEGEN_H

#include "ace/Singleton.h"
#include "ace/Synch.h"
#include "TAO_IDL_BE_Export.h"

class TAO_Visitor_Factory;
class TAO_OutStream;
class be_visitor_context;
class be_visitor;
class be_decl;

class TAO_IDL_BE_Export TAO_CodeGen
{
  // = TITLE
  //    TAO_CodeGen
  //
  // = DESCRIPTION
  //    Holds global parameters for the Back End and
  //    generates the C++ mapping.
  //
public:

  // Define all the code generation states.
  // The first letter C/S of the suffix stands for client/server-side
  // The second letter H/I/S stands for header/inline/impl file.
  // These are used to denote the state or the context of code
  // generation we are in and serves to produce the right kind of
  // visitor for us.

  enum CG_STATE
    {
      // Initial state.
      TAO_INITIAL,

      // Rest of the state in alphabetical order of the types.

      // Emitting code for arguments of an operation. No distinction between
      // headers, inlines, stubs.
      TAO_ARGUMENT_ARGLIST_CH,                  // argument in op signature of
      // ... client header
      TAO_ARGUMENT_ARGLIST_SH,                  // argument in op signature of
      // ... server header
      TAO_ARGUMENT_INVOKE_ARG_LIST,

      TAO_ARGUMENT_INTERCEPTORS_ARGLIST_CH,     // ... client header
      TAO_ARGUMENT_INTERCEPTORS_ARGLIST_CS,     // ... client source
      TAO_ARGUMENT_INTERCEPTORS_INFO_ARGLIST_CH,    // ... client header
      TAO_ARGUMENT_INTERCEPTORS_INFO_ARGLIST_CS,    // ... client source
      TAO_ARGUMENT_INTERCEPTORS_PARAMLIST,      // ... client source
      TAO_ARGUMENT_INTERCEPTORS_RESULT,         // ... client source
      TAO_ARGUMENT_INTERCEPTORS_ARGLIST_SH,     // ... server header
      TAO_ARGUMENT_INTERCEPTORS_ARGLIST_SS,     // ... server source
      TAO_ARGUMENT_INTERCEPTORS_INFO_ARGLIST_SS,    // ... server source
      TAO_ARGUMENT_ARGLIST_OTHERS,              // ... in other cases
      TAO_ARGUMENT_PRE_INVOKE_CS,               // preprocessing of argument
      // variable before passing to
      // do_static_call  (in stub)
      TAO_ARGUMENT_INVOKE_CS,                   // passing argument variable to do_static_call
      TAO_ARGUMENT_POST_INVOKE_CS,              // postprocessing of argument
      // variable after do_static_call
      TAO_ARGUMENT_VARDECL_SS,                  // declaration of argument
      // variable in skeleton (server)
      TAO_ARGUMENT_MARSHAL_SS,                  // passing argument node to the
      TAO_ARGUMENT_DEMARSHAL_SS,                // demarshal and marshal
      // operations
      TAO_ARGUMENT_UPCALL_SS,                   // passing argument variable to upcall
      TAO_ARGUMENT_COLLOCATED_UPCALL_SS,        // passing argument
      // variable to upcall

      // emitting code for attributes.
      TAO_ATTRIBUTE_CH,                         // in client header
      TAO_ATTRIBUTE_CS,                         // in client stubs
      TAO_ATTRIBUTE_SH,                         // in server header
      TAO_ATTRIBUTE_IH,                         // in implementation header
      TAO_ATTRIBUTE_SS,                         // in server skeletons
      TAO_ATTRIBUTE_IS,                         // in implementation skeletons

      TAO_ATTRIBUTE_BASE_PROXY_IMPL_CH,         // Proxy Impl Related Attribute visitors.

      TAO_ATTRIBUTE_PROXY_IMPL_XH,

      TAO_ATTRIBUTE_REMOTE_PROXY_IMPL_CS,
      TAO_ATTRIBUTE_THRU_POA_PROXY_IMPL_SS,
      TAO_ATTRIBUTE_DIRECT_PROXY_IMPL_SS,

      TAO_ATTRIBUTE_SMART_PROXY_CH,             // in client header
      TAO_ATTRIBUTE_SMART_PROXY_CS,             // in client source
      TAO_ATTRIBUTE_INTERCEPTORS_CS,            // in client source
      TAO_ATTRIBUTE_INTERCEPTORS_SH,            // in server header
      TAO_ATTRIBUTE_INTERCEPTORS_SS,            // in server source

      TAO_ATTRIBUTE_TIE_SH,
      TAO_ATTRIBUTE_TIE_SI,

      // Emitting code for array defn.
      TAO_ARRAY_CH,
      TAO_ARRAY_CI,
      TAO_ARRAY_CS,
      TAO_ARRAY_ANY_OP_CH,
      TAO_ARRAY_ANY_OP_CS,
      TAO_ARRAY_CDR_OP_CH,
      TAO_ARRAY_CDR_OP_CI,
      TAO_ARRAY_CDR_OP_CS,

      // Emitting code for the constants.
      TAO_CONSTANT_CH,                          // in client header
      TAO_CONSTANT_CI,                          // XXXASG rm?
      TAO_CONSTANT_CS,                          // in client stub

      // Emitting code for enums.
      TAO_ENUM_CH,                              // in client header
      TAO_ENUM_CS,                              // in client stubs
      TAO_ENUM_ANY_OP_CH,
      TAO_ENUM_ANY_OP_CS,
      TAO_ENUM_CDR_OP_CH,
      TAO_ENUM_CDR_OP_CI,
      TAO_ENUM_CDR_OP_CS,

      // Emitting code for exceptions.
      TAO_EXCEPTION_CH,
      TAO_EXCEPTION_CTOR_CH,
      TAO_EXCEPTION_CI,
      TAO_EXCEPTION_CS,
      TAO_EXCEPTION_CTOR_CS,
      TAO_EXCEPTION_CTOR_ASSIGN_CS,
      TAO_EXCEPTION_ANY_OP_CH,
      TAO_EXCEPTION_ANY_OP_CS,
      TAO_EXCEPTION_CDR_OP_CH,
      TAO_EXCEPTION_CDR_OP_CI,
      TAO_EXCEPTION_CDR_OP_CS,

      // Emitting fields i.e., struct members.
      TAO_FIELD_CH,
      TAO_FIELD_CI,
      TAO_FIELD_CS,
      TAO_FIELD_CDR_OP_CH,
      TAO_FIELD_CDR_OP_CI,
      TAO_FIELD_CDR_OP_CS,
      TAO_FIELD_OBV_CH,

      // Emitting code for the interface.
      TAO_INTERFACE_CH,
      TAO_INTERFACE_CI,
      TAO_INTERFACE_CS,
      TAO_INTERFACE_SH,
      TAO_INTERFACE_IH,
      TAO_INTERFACE_SI,
      TAO_INTERFACE_SS,
      TAO_INTERFACE_IS,
      TAO_INTERFACE_ANY_OP_CH,
      TAO_INTERFACE_ANY_OP_CS,
      TAO_INTERFACE_CDR_OP_CH,
      TAO_INTERFACE_CDR_OP_CI,
      TAO_INTERFACE_CDR_OP_CS,
      TAO_INTERFACE_TIE_SH,
      TAO_INTERFACE_TIE_SI,
      TAO_INTERFACE_SMART_PROXY_CH,
      TAO_INTERFACE_SMART_PROXY_CS,
      TAO_INTERFACE_INTERCEPTORS_CH,
      TAO_INTERFACE_INTERCEPTORS_CS,
      TAO_INTERFACE_INTERCEPTORS_SH,
      TAO_INTERFACE_INTERCEPTORS_SS,
      TAO_INTERFACE_PROXY_BROKERS_CH,
      TAO_INTERFACE_PROXY_BROKERS_CS,
      TAO_INTERFACE_PROXY_BROKERS_SH,
      TAO_INTERFACE_PROXY_BROKERS_SS,
      TAO_INTERFACE_BASE_PROXY_BROKER_CH,
      TAO_INTERFACE_BASE_PROXY_BROKER_CS,
      TAO_INTERFACE_REMOTE_PROXY_BROKER_CH,
      TAO_INTERFACE_REMOTE_PROXY_BROKER_CS,
      TAO_INTERFACE_STRATEGIZED_PROXY_BROKER_SH,
      TAO_INTERFACE_STRATEGIZED_PROXY_BROKER_SS,
      TAO_INTERFACE_PROXY_IMPLS_CH,
      TAO_INTERFACE_PROXY_IMPLS_CS,

      TAO_INTERFACE_PROXY_IMPLS_SH,

      TAO_INTERFACE_PROXY_IMPLS_SS,
      TAO_INTERFACE_BASE_PROXY_IMPL_CH,
      TAO_INTERFACE_BASE_PROXY_IMPL_CS,
      TAO_INTERFACE_REMOTE_PROXY_IMPL_CH,
      TAO_INTERFACE_REMOTE_PROXY_IMPL_CS,
      TAO_INTERFACE_THRU_POA_PROXY_IMPL_SH,
      TAO_INTERFACE_THRU_POA_PROXY_IMPL_SS,
      TAO_INTERFACE_DIRECT_PROXY_IMPL_SH,
      TAO_INTERFACE_DIRECT_PROXY_IMPL_SS,

      // Emitting code for the interface forward declaration.
      TAO_INTERFACE_FWD_CH,
      TAO_INTERFACE_FWD_CDR_OP_CH,
      TAO_INTERFACE_FWD_CDR_OP_CI,
      TAO_INTERFACE_FWD_ANY_OP_CH,

      // Emitting code for the AMH ResponseHandlers.
      TAO_INTERFACE_AMH_RH_CH,
      TAO_INTERFACE_AMH_RH_SH,
      TAO_INTERFACE_AMH_RH_SS,

      // Emitting code for the valuetype.
      TAO_VALUETYPE_CH,
      TAO_VALUETYPE_CI,
      TAO_VALUETYPE_CS,
      TAO_VALUETYPE_SH,
      TAO_VALUETYPE_IH,
      TAO_VALUETYPE_SI,
      TAO_VALUETYPE_SS,
      TAO_VALUETYPE_IS,
      TAO_VALUETYPE_OBV_CH,                 // OBV_ class
      TAO_VALUETYPE_OBV_CI,
      TAO_VALUETYPE_OBV_CS,
      TAO_VALUETYPE_COLLOCATED_SH,
      TAO_VALUETYPE_COLLOCATED_SS,
      TAO_VALUETYPE_ANY_OP_CH,
      TAO_VALUETYPE_ANY_OP_CS,
      TAO_VALUETYPE_MARSHAL_CH,     // the actual generation of CDR in header
      TAO_VALUETYPE_MARSHAL_CS,     // and the implementation, activated from:
      TAO_VALUETYPE_CDR_OP_CH,
      TAO_VALUETYPE_CDR_OP_CI,
      TAO_VALUETYPE_CDR_OP_CS,
      TAO_VALUETYPE_INIT_CH,        // _init -related generation
      TAO_VALUETYPE_INIT_CI,        //
      TAO_VALUETYPE_INIT_CS,        //
      TAO_VALUETYPE_INIT_ARGLIST_CH,// unfortunately there are no CI and CS

      // Emitting code for the valuetype forward declaration.
      TAO_VALUETYPE_FWD_CH,
      TAO_VALUETYPE_FWD_ANY_OP_CH,
      TAO_VALUETYPE_FWD_CDR_OP_CH,
      TAO_VALUETYPE_FWD_CDR_OP_CI,

      // Emitting code for the component.
      TAO_COMPONENT_CH,
      TAO_COMPONENT_CI,
      TAO_COMPONENT_CS,
      TAO_COMPONENT_IS,
      TAO_COMPONENT_IH,
      TAO_COMPONENT_SH,
      TAO_COMPONENT_SI,
      TAO_COMPONENT_SS,
      TAO_COMPONENT_ANY_OP_CH,
      TAO_COMPONENT_ANY_OP_CS,
      TAO_COMPONENT_CDR_OP_CH,
      TAO_COMPONENT_CDR_OP_CI,
      TAO_COMPONENT_CDR_OP_CS,

      // Emitting code for the component forward declaration.
      TAO_COMPONENT_FWD_CH,
      TAO_COMPONENT_FWD_CDR_OP_CH,
      TAO_COMPONENT_FWD_CDR_OP_CI,
      TAO_COMPONENT_FWD_ANY_OP_CH,

      // Emitting code for the eventtype.
      TAO_EVENTTYPE_CH,
      TAO_EVENTTYPE_CI,
      TAO_EVENTTYPE_CS,
      TAO_EVENTTYPE_IS,
      TAO_EVENTTYPE_IH,
      TAO_EVENTTYPE_SH,
      TAO_EVENTTYPE_SI,
      TAO_EVENTTYPE_SS,
      TAO_EVENTTYPE_OBV_CH,                 // OBV_ class
      TAO_EVENTTYPE_OBV_CI,
      TAO_EVENTTYPE_OBV_CS,
      TAO_EVENTTYPE_ANY_OP_CH,
      TAO_EVENTTYPE_ANY_OP_CS,
      TAO_EVENTTYPE_CDR_OP_CH,
      TAO_EVENTTYPE_CDR_OP_CI,
      TAO_EVENTTYPE_CDR_OP_CS,

      // Emitting code for the eventtype forward declaration.
      TAO_EVENTTYPE_FWD_CH,
      TAO_EVENTTYPE_FWD_CDR_OP_CH,
      TAO_EVENTTYPE_FWD_CDR_OP_CI,
      TAO_EVENTTYPE_FWD_ANY_OP_CH,

      // Emitting code for the component home.
      TAO_HOME_CH,
      TAO_HOME_CI,
      TAO_HOME_CS,
      TAO_HOME_IS,
      TAO_HOME_IH,
      TAO_HOME_SH,
      TAO_HOME_SI,
      TAO_HOME_SS,
      TAO_HOME_ANY_OP_CH,
      TAO_HOME_ANY_OP_CS,
      TAO_HOME_CDR_OP_CH,
      TAO_HOME_CDR_OP_CI,
      TAO_HOME_CDR_OP_CS,

      // Emitting code for the module,
      TAO_MODULE_CH,
      TAO_MODULE_CI,
      TAO_MODULE_CS,
      TAO_MODULE_SH,
      TAO_MODULE_SI,
      TAO_MODULE_IH,
      TAO_MODULE_SS,
      TAO_MODULE_IS,
      TAO_MODULE_ANY_OP_CH,
      TAO_MODULE_ANY_OP_CS,
      TAO_MODULE_CDR_OP_CH,
      TAO_MODULE_CDR_OP_CI,
      TAO_MODULE_CDR_OP_CS,
      TAO_MODULE_OBV_CH,                    // for OBV_ (cmp. POA_ namespace)
      TAO_MODULE_OBV_CI,
      TAO_MODULE_OBV_CS,

      // Emitting code for an operation.
      TAO_OPERATION_CH,                       // in client header
      TAO_OPERATION_CS,                       // in client stubs
      TAO_OPERATION_SH,                       // in server header
      TAO_OPERATION_IH,                       // in implementation header
      TAO_OPERATION_SS,                       // in server skeletons
      TAO_OPERATION_IS,                       // in server skeletons

      TAO_OPERATION_BASE_PROXY_IMPL_CH,       // Proxy_Impl operation gen.
      // in client header
      TAO_OPERATION_PROXY_IMPL_XH,
      TAO_OPERATION_REMOTE_PROXY_IMPL_CS,
      TAO_OPERATION_THRU_POA_PROXY_IMPL_SS,
      TAO_OPERATION_DIRECT_PROXY_IMPL_SS,

      TAO_OPERATION_SMART_PROXY_CH,           // in client header
      TAO_OPERATION_SMART_PROXY_CS,           // in client stubs
      TAO_OPERATION_INTERCEPTORS_CH,          // in client header
      TAO_OPERATION_INTERCEPTORS_CS,          // in client source
      TAO_OPERATION_INTERCEPTORS_SH,          // in server header
      TAO_OPERATION_INTERCEPTORS_SS,          // in server source

      TAO_OPERATION_RETTYPE_CH,               // return type in client header op
      // signature
      TAO_OPERATION_INTERCEPTORS_INFO_RETTYPE_CH, // return type in client header op
      // signature for RequestInfo class
      TAO_OPERATION_RETTYPE_SH,               // return type in server header op
      // signature
      TAO_OPERATION_RETTYPE_IS,               // return type in client header op
      TAO_OPERATION_RETTYPE_OTHERS,           // ... in other cases

      TAO_OPERATION_ARGLIST_CH,               // parameter list in op signature
      // ... for client header
      TAO_OPERATION_ARGLIST_SH,               // ... for server header
      TAO_OPERATION_INTERCEPTORS_ARGLIST_CH,  // private member list list for request info
      TAO_OPERATION_INTERCEPTORS_INFO_ARGLIST_CH,   // private member list list for request info
      TAO_OPERATION_INTERCEPTORS_INFO_ARGLIST_CS,   // arglist for request info obj instantiation
      TAO_OPERATION_INTERCEPTORS_ARGLIST_CS,   // private member list list for request info                                                                         // ... for client source
      TAO_OPERATION_INTERCEPTORS_PARAMLIST,   // create the paramlist on demand
      TAO_OPERATION_INTERCEPTORS_RESULT,      // create the result on demand
      TAO_OPERATION_INTERCEPTORS_EXCEPTLIST,  // create the exceptionlist on demand
      TAO_OPERATION_INTERCEPTORS_ARGLIST_SH,  // private member list list for request info
      TAO_OPERATION_INTERCEPTORS_INFO_ARGLIST_SH,   // private member list list for request info
      TAO_OPERATION_INTERCEPTORS_INFO_ARGLIST_SS,   // arglist for request info obj instantiation
      TAO_OPERATION_INTERCEPTORS_ARGLIST_SS,  // private member list list for request info                                                                  // ... for server source

      TAO_OPERATION_ARGLIST_PROXY_IMPL_XH,    // Proxy impl arg list generation
      // in client/server  header
      TAO_OPERATION_ARGLIST_PROXY_IMPL_XS,

      TAO_OPERATION_ARGLIST_BASE_PROXY_IMPL_CH,

      TAO_OPERATION_ARGLIST_IH,               // ... for implementation header
      TAO_OPERATION_ARGLIST_IS,               // ... for implementation header
      TAO_OPERATION_ARGLIST_COLLOCATED_SH,    // ... for collocated server
      TAO_OPERATION_ARGLIST_OTHERS,           // ... for all other cases
      TAO_OPERATION_RETVAL_DECL_CS,           // return value variable declaration
      TAO_OPERATION_RETVAL_PRE_INVOKE_CS,     // preprocessing for return value
      // before sending over the wire
      TAO_OPERATION_ARG_PRE_INVOKE_CS,        // preprocessing of arguments
      //   before do_static_call
      TAO_OPERATION_RETVAL_INVOKE_CS,         // passing the return type
      //   variable to do_static_call
      TAO_OPERATION_ARG_INVOKE_CS,            // passing argument variable to do_static_call
      //   after do_static_call
      TAO_OPERATION_ARG_POST_INVOKE_CS,       // processing of arg after do_static_call
      TAO_OPERATION_RETVAL_RETURN_CS,         // returning the return type
      // variable
      TAO_OPERATION_EXCEPTLIST_CS,            // generating the exception list
      TAO_OPERATION_RETVAL_DECL_SS,           // return type decl in skeleton
      TAO_OPERATION_ARG_DECL_SS,              // argument decl in skeleton
      TAO_OPERATION_ARG_DEMARSHAL_SS,         //   and argument variables to the
      TAO_OPERATION_RETVAL_MARSHAL_SS,        //   marshal and demarshal operations
      TAO_OPERATION_ARG_MARSHAL_SS,
      TAO_OPERATION_RETVAL_ASSIGN_SS,         // assigning to return type
      // variable
      TAO_OPERATION_ARG_UPCALL_SS,            // variables to upcall
      TAO_OPERATION_COLLOCATED_ARG_UPCALL_SS, // variables to upcall for
      // collocated op
      TAO_OPERATION_ARG_POST_UPCALL_SS,       //   return and argument variables
      TAO_OPERATION_INTERCEPTORS_ARG_INFO_CS, // Interceptor args
      TAO_OPERATION_INTERCEPTORS_ARG_INFO_SS, // Interceptor args
      TAO_OPERATION_RESULT_SS,                // XXXASG rm?
      TAO_OPERATION_TIE_SH,
      TAO_OPERATION_TIE_SI,

      TAO_OBV_OPERATION_ARGLIST_CH,           // parameter list in obv op signature
      TAO_OBV_OPERATION_ARGLIST_CS,           // used only for AMH exceptions
      // ... for client header
      TAO_OBV_OPERATION_ARGLIST_OBV_CH,       // ... for OBV_ class
      TAO_OBV_OPERATION_ARGLIST_SH,           // ... for server header
      TAO_OBV_OPERATION_ARGLIST_IH,           // ... for implementation header
      TAO_OBV_OPERATION_ARGLIST_IS,           // ... for implementation header
      TAO_OBV_OPERATION_ARGLIST_COLLOCATED_SH,   // ... for collocated server
      TAO_OBV_OPERATION_ARGLIST_OTHERS,          // ... for all other cases
      TAO_OBV_OPERATION_ARGLIST_IMPL_CH,      // for implementations, e.g. exception holders
      TAO_OBV_OPERATION_ARGLIST_IMPL_CS,      // for implementations, e.g. exception holders

      // AMI next generation states
      TAO_AMI_INTERFACE_CH,
      TAO_AMI_SENDC_OPERATION_CH,
      TAO_AMI_SENDC_OPERATION_CS,
      TAO_AMI_HANDLER_REPLY_STUB_OPERATION_CH,
      TAO_AMI_HANDLER_REPLY_STUB_OPERATION_CS,
      TAO_AMI_EXCEPTION_HOLDER_VALUETYPE_CH,
      TAO_AMI_EXCEPTION_HOLDER_VALUETYPE_CS,
      TAO_AMI_EXCEPTION_HOLDER_RAISE_OPERATION_CS,

      // AMH next state generation
      TAO_OPERATION_AMH_RH_SH,
      TAO_OPERATION_AMH_RH_SS,

      // Emitting code for root.
      TAO_ROOT_CH,
      TAO_ROOT_CI,
      TAO_ROOT_CS,
      TAO_ROOT_SH,
      TAO_ROOT_SI,
      TAO_ROOT_SS,
      TAO_ROOT_TIE_SH,
      TAO_ROOT_IH,
      TAO_ROOT_IS,
      TAO_ROOT_ANY_OP_CH,
      TAO_ROOT_ANY_OP_CS,
      TAO_ROOT_CDR_OP_CH,
      TAO_ROOT_CDR_OP_CI,
      TAO_ROOT_CDR_OP_CS,

      // Emitting sequences.
      TAO_SEQUENCE_CH,
      TAO_SEQUENCE_CI,
      TAO_SEQUENCE_CS,
      TAO_SEQUENCE_ANY_OP_CH,
      TAO_SEQUENCE_ANY_OP_CS,
      TAO_SEQUENCE_CDR_OP_CH,
      TAO_SEQUENCE_CDR_OP_CI,
      TAO_SEQUENCE_CDR_OP_CS,

      // Emitting code for sequence base type.
      TAO_SEQUENCE_BASE_CH,
      TAO_SEQUENCE_BASE_CI,
      TAO_SEQUENCE_BASE_CS,

      // For special sequnce elements.
      TAO_SEQELEM_RETTYPE_CH,
      TAO_SEQELEM_RETTYPE_CI,
      TAO_SEQELEM_RETTYPE_CS,

      // For sequence buffer types.
      TAO_SEQUENCE_BUFFER_TYPE_CH,
      TAO_SEQUENCE_BUFFER_TYPE_CI,
      TAO_SEQUENCE_BUFFER_TYPE_CS,

      // Emitting code for struct and its members.
      TAO_STRUCT_CH,
      TAO_STRUCT_CI,
      TAO_STRUCT_CS,
      TAO_STRUCT_ANY_OP_CH,
      TAO_STRUCT_ANY_OP_CS,
      TAO_STRUCT_CDR_OP_CH,
      TAO_STRUCT_CDR_OP_CI,
      TAO_STRUCT_CDR_OP_CS,

      // Emitting code for a forward declared struct.
      TAO_STRUCT_FWD_CH,

      // Emitting code for typedefs.
      TAO_TYPEDEF_CH,
      TAO_TYPEDEF_CI,
      TAO_TYPEDEF_CS,
      TAO_TYPEDEF_ANY_OP_CH,
      TAO_TYPEDEF_ANY_OP_CS,
      TAO_TYPEDEF_CDR_OP_CH,
      TAO_TYPEDEF_CDR_OP_CI,
      TAO_TYPEDEF_CDR_OP_CS,

      // Emitting code for unions.
      TAO_UNION_CH,
      TAO_UNION_CI,
      TAO_UNION_CS,
      TAO_UNION_ANY_OP_CH,
      TAO_UNION_ANY_OP_CS,
      TAO_UNION_CDR_OP_CH,
      TAO_UNION_CDR_OP_CI,
      TAO_UNION_CDR_OP_CS,

      // Emitting code for a forward declared union.
      TAO_UNION_FWD_CH,

      // Emitting code for the discriminant.
      TAO_UNION_DISCTYPEDEFN_CH,
      TAO_UNION_DISCTYPEDEFN_CI,
      TAO_UNION_DISCTYPEDEFN_CS,

      // Emitting code for the public members of the union.
      TAO_UNION_PUBLIC_CH,
      TAO_UNION_PUBLIC_CI,
      TAO_UNION_PUBLIC_CS,
      TAO_UNION_PUBLIC_ASSIGN_CS,
      TAO_UNION_PUBLIC_RESET_CS,

      // Emitting code for private members of the union.
      TAO_UNION_PRIVATE_CH,

      // Emitting code for CDR operators for types defined inside unions.
      TAO_UNION_BRANCH_CDR_OP_CH,
      TAO_UNION_BRANCH_CDR_OP_CI,
      TAO_UNION_BRANCH_CDR_OP_CS,

      // Emitting code for typecodes.
      TAO_TYPECODE_DECL,
      TAO_TYPECODE_DEFN,

      // Always must be last.
      TAO_UNKNOWN
    };

  enum LOOKUP_STRATEGY
    {
      // Various lookup strategies.
      TAO_LINEAR_SEARCH,
      TAO_DYNAMIC_HASH,
      TAO_PERFECT_HASH,
      TAO_BINARY_SEARCH,
      TAO_ACTIVE_DEMUX,
      TAO_USER_DEFINED
    };

  enum CG_SUB_STATE
    {
      // Sub states.

      // These are for the CDR operators.
      TAO_CDR_INPUT,
      TAO_CDR_OUTPUT,
      TAO_CDR_SCOPE,

      // These are for typecode generation.
      TAO_TC_DEFN_TYPECODE,                   // top level typecode
      TAO_TC_DEFN_TYPECODE_NESTED,            // nested tc

      TAO_TC_DEFN_ENCAPSULATION,              // encapsulation
      TAO_AMI_HANDLER_TC_DEFN_ENCAPSULATION,  // encapsulation

      TAO_TC_DEFN_SCOPE,                      // scope
      TAO_TC_DEFN_TC_SIZE,                    // tc size computation
      TAO_TC_DEFN_ENCAP_LEN,                  // encap size computation
      TAO_TC_DEFN_SCOPE_LEN,                  // scope size computation

      // Means we are not generating the assignment operator.
      TAO_UNION_COPY_CONSTRUCTOR,

      // Generating the _var template parameter in sequence of arrays.
      TAO_ARRAY_SEQ_CH_TEMPLATE_VAR,

      // Generating an AMH response handler operation.
      TAO_AMH_RESPONSE_HANDLER_OPERATION,

      // Used to denote either error or don't care.
      TAO_SUB_STATE_UNKNOWN
    };

  TAO_CodeGen (void);
  // Constructor

  ~TAO_CodeGen (void);
  // Destructor

  be_visitor *make_visitor (be_visitor_context *);
  // Factory that makes the right visitor based on the contex. This
  // delegates the task to its factory data member.

  int gen_cplusplus_mapping (void);
  // Generate the C++ mapping for CORBA IDL.

  int start_client_header (const char *fname);
  // Set the client header stream.

  int start_client_inline (const char *fname);
  // Set the client inline stream.

  int start_client_stubs (const char *fname);
  // Set the client stub stream.

  int start_server_header (const char *fname);
  // Set the server header stream.

  int start_implementation_header (const char *fname);
  // Set the implementation header stream.

  int start_implementation_skeleton (const char *fname);
  // Set the implementation skeleton stream.

  int start_server_template_header (const char *fname);
  // Set the server template header stream.

  int start_server_inline (const char *fname);
  // Set the server inline stream.

  int start_server_template_inline (const char *fname);
  // Set the server template inline stream.

  int start_server_skeletons (const char *fname);
  // Set the server skeletons stream.

  int start_server_template_skeletons (const char *fname);
  // Set the server template skeletons stream.

  int end_client_header (void);
  // Generate code at the end such as the <<= and >>= operators alongwith the
  // ending #endif statement.

  int end_server_header (void);
  // Put a last #endif in the server header.

  int end_implementation_header (const char *fname);
  // Put a last #endif in the server header.

  int end_implementation_skeleton (const char *fname);
  // Put a last #endif in the server header.

  int end_server_template_header (void);
  // Put a last #endif in the server template header.

  int end_server_template_inline (void);
  // Put a last #endif in the server template header.

  int end_server_template_skeletons (void);
  // Put a last #endif in the server skeletons.

  int end_server_skeletons (void);
  // Put a last #endif in the server skeletons.

  TAO_OutStream *client_header (void);
  // Get the client header stream.

  TAO_OutStream *client_stubs (void);
  // Get the client stubs stream.

  TAO_OutStream *client_inline (void);
  // Get the client inline stream.

  TAO_OutStream *server_header (void);
  // get the server header stream.

  TAO_OutStream *implementation_header (void);
  // Get the implementation header stream.

  TAO_OutStream *implementation_skeleton (void);
  // Get the implementation skeleton stream.

  TAO_OutStream *server_template_header (void);
  // Get the server header template stream.

  TAO_OutStream *server_skeletons (void);
  // Get the server skeletons stream.

  TAO_OutStream *server_template_skeletons (void);
  // Get the server template skeletons stream.

  TAO_OutStream *server_inline (void);
  // Get the server inline stream.

  TAO_OutStream *server_template_inline (void);
  // Get the server template inline stream.

  void gperf_input_stream (TAO_OutStream *gperf_input);
  // Set the gperf input file stream.

  TAO_OutStream *gperf_input_stream (void);
  // Retrieve the gperf input stream being used.

  void gperf_input_filename (char *filename);
  // Set the gperf input file name.

  char *gperf_input_filename (void);
  // Retrieve the gperf input file name being used.
  // Name of the temp file used to collect the input for gperf
  // program. This is needed coz I do ACE_OS::open on this when I need
  // ACE_HANDLE for the file instead FILE*.

  void outstream (TAO_OutStream *os);
  // Set current out stream.

  TAO_OutStream *outstream (void);
  // Retrieve current out stream being used.

  void config_visitor_factory (void);
  // Set the visitor factory  object. In this respect, this behaves as the
  // "strategy" pattern in which the TAO_CodeGen object is the context and the
  // visitor_factory is the strategy object.

  void node (be_decl *n);
  // Pass info.

  be_decl *node (void);
  // Retrieve passed info.

  const char *upcase (const char *str);
  // Convert input string to all upcase.

  void gen_ident_string (TAO_OutStream *stream) const;
  // Pass along the #ident string, if any, from the IDL file.

private:
  void gen_ifndef_string (const char *fname,
                          TAO_OutStream *stream,
                          const char *prefix,
                          const char *suffix);

  void gen_standard_include (TAO_OutStream *stream,
                             const char *included_file);

private:
  TAO_OutStream *client_header_;
  // Client header stream.

  TAO_OutStream *client_stubs_;
  // Client stub file stream

  TAO_OutStream *client_inline_;
  // Client side inline definitions.

  TAO_OutStream *server_header_;
  // Server header stream.

  TAO_OutStream *implementation_header_;
  // Implementation header stream.

  TAO_OutStream *implementation_skeleton_;
  // Implementation skeleton stream.

  TAO_OutStream *server_template_header_;
  // Server header template stream.

  TAO_OutStream *server_skeletons_;
  // Server skeleton stream.

  TAO_OutStream *server_template_skeletons_;
  // Server skeleton template stream.

  TAO_OutStream *server_inline_;
  // Server side inline file.

  TAO_OutStream *server_template_inline_;
  // Server side template inline file.

  TAO_OutStream *gperf_input_stream_;
  // TAO_OutStream to collect the input for gperf program.

  char *gperf_input_filename_;
  // Name of the temp file used to collect the input for gperf
  // program. This is needed coz I do ACE_OS::open on this when I need
  // ACE_HANDLE for the file instead FILE*.

  TAO_OutStream *curr_os_;
  // Currently used out stream.

  be_decl *node_;
  // Save current node in this.

  TAO_Visitor_Factory *visitor_factory_;
  // Visitor factory object.

  LOOKUP_STRATEGY strategy_;
  // The enumerated value indicating the lookup strategy.
};

typedef ACE_Singleton<TAO_CodeGen, ACE_SYNCH_RECURSIVE_MUTEX> TAO_CODEGEN;
// Singleton instance of the BE code generator.

extern TAO_IDL_BE_Export TAO_CodeGen *tao_cg;
// Code generator instance which is used everywhere.

#endif /* if !defined */
