// tao_idl.cpp,v 1.25 2002/09/25 16:25:34 parsons Exp

/*

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Copyright 1992, 1993, 1994 Sun Microsystems, Inc.  Printed in the United
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This product is protected by copyright and distributed under the following
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The Interface Definition Language Compiler Front End (CFE) is made
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notice on all media and documentation and the software program in which
this product is incorporated in whole or part. You may copy and extend
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*/

#include "idl_defines.h"
#include "be_codegen.h"
#include "be_generator.h"
#include "be_extern.h"
#include "global_extern.h"
#include "fe_extern.h"
#include "ast_root.h"
#include "ast_extern.h"
#include "utl_string.h"
#include "utl_identifier.h"
#include "drv_extern.h"
#include "ace/Process.h"
#include "../tao/Version.h"

ACE_RCSID (TAO_IDL,
           tao_idl,
           "tao_idl.cpp,v 1.25 2002/09/25 16:25:34 parsons Exp")

#define IDL_CFE_VERSION "1.3.0"

#if !defined (NFILES)
# define NFILES 1024
#endif /* ! NFILES */

const char *DRV_files[NFILES];
long DRV_nfiles = 0;
long DRV_file_index = -1;

const size_t LOCAL_ESCAPES_BUFFER_SIZE = 1024;

extern TAO_IDL_BE_Export void BE_produce (void);
extern TAO_IDL_BE_Export void BE_abort (void);

// Initialize the BE. The protocol requires only that this routine
// return an instance of AST_Generator (or a subclass thereof).
AST_Generator *
BE_gen (void)
{
  tao_cg = TAO_CODEGEN::instance ();

  AST_Generator *g = 0;
  ACE_NEW_RETURN (g,
                  be_generator (),
                  0);

  return g;
}

void
BE_init (void)
{
  Identifier id ("void");
  UTL_ScopedName n (&id,
                    0);
  AST_Decl *d = 
    idl_global->scopes ().bottom ()->lookup_primitive_type (
                                          AST_Expression::EV_void
                                        );
  be_global->void_type (AST_PredefinedType::narrow_from_decl (d));
  id.destroy ();
}

// Print out a version string for the BE.
void
BE_version (void)
{
  ACE_DEBUG ((LM_DEBUG,
              "%s %s\n",
              ACE_TEXT ("TAO C++ BE, version"),
              ACE_TEXT (TAO_VERSION)));
}

void
DRV_version (void)
{
  ACE_DEBUG ((LM_DEBUG,
              "%s\n"
              "%s %s\n",
              idl_global->prog_name (),
              ACE_TEXT ("FE: Based on Sun IDL CFE version"),
              ACE_TEXT (IDL_CFE_VERSION)));

  BE_version ();
}

void
DRV_init (void)
{
  // Initialize FE global data object.
  ACE_NEW (idl_global,
           IDL_GlobalData);

  // Initialize some of its data.
  idl_global->set_root (0);
  idl_global->set_gen (0);
  idl_global->set_err (FE_new_UTL_Error ());
  idl_global->set_err_count (0);
  idl_global->set_indent (FE_new_UTL_Indenter ());
  idl_global->set_filename (0);
  idl_global->set_main_filename (0);
  idl_global->set_real_filename (0);
  idl_global->set_stripped_filename (0);
  idl_global->set_import (I_TRUE);
  idl_global->set_in_main_file (I_FALSE);
  idl_global->set_lineno (-1);
  idl_global->set_prog_name (0);

#if defined (TAO_IDL_PREPROCESSOR)
  idl_global->set_cpp_location (TAO_IDL_PREPROCESSOR);
#elif defined (ACE_CC_PREPROCESSOR)
  idl_global->set_cpp_location (ACE_CC_PREPROCESSOR);
#else
  // Just default to cc
  idl_global->set_cpp_location ("cc");
#endif /* TAO_IDL_PREPROCESSOR */

  char local_escapes[LOCAL_ESCAPES_BUFFER_SIZE];
  ACE_OS::memset (&local_escapes,
                  0,
                  LOCAL_ESCAPES_BUFFER_SIZE);

  idl_global->set_local_escapes (local_escapes);
  idl_global->set_be ("");
  idl_global->set_compile_flags (0);
  idl_global->set_read_from_stdin (I_FALSE);
  idl_global->set_include_file_names (0);
  idl_global->set_n_include_file_names (0);
  idl_global->set_parse_state (IDL_GlobalData::PS_NoState);

  // Put an empty prefix on the stack for the global scope.
  idl_global->pragma_prefixes ().push (ACE::strnew (""));

  // Initialize BE global data object.
  ACE_NEW (be_global,
           BE_GlobalData);

  // Initialize driver private data
  DRV_nfiles = 0;
  DRV_file_index = 0;
}

/*
** Drive the compilation
**
** LOGIC:
**
** 2. Initialize the BE. This builds an instance of the generator
** 3. Initialize the FE. This builds the global scope
**    and populates it with the predefined types
** 4. Invoke FE_yyparse
** 5. Check for errors from FE_yyparse. If any, exit now
** 6. Check for undefined forward declared interfaces. If any, exit now
** 7. Check if asked to dump AST. If so, do.
** 8. Invoke BE.
*/

void
DRV_drive (const char *s)
{
  // Set the name of the IDL file we are parsing. This is useful to
  // the backend when it generates C++ headers and files.
  UTL_String *src_file = 0;
  ACE_NEW (src_file,
           UTL_String (s));

  idl_global->idl_src_file (src_file);

  // Pass through CPP.
  if (idl_global->compile_flags () & IDL_CF_INFORMATIVE)
    {
      ACE_DEBUG ((LM_DEBUG,
                  "%s%s %s\n",
                  idl_global->prog_name (),
                  ACE_TEXT (": preprocessing"),
                  s));
    }

  DRV_pre_proc (s);

  // Initialize BE.
  AST_Generator *gen = BE_gen ();

  if (gen == 0)
    {
      ACE_ERROR ((
          LM_ERROR,
          ACE_TEXT ("IDL: BE init failed to create generator, exiting\n")
        ));

      ACE_OS::exit (99);
    }
  else
    {
      idl_global->set_gen (gen);
    }

  // Initialize FE.
  FE_init ();
  // Initialize BE.
  BE_init ();

  // Parse.
  if (idl_global->compile_flags () & IDL_CF_INFORMATIVE)
    {
      ACE_DEBUG ((LM_DEBUG,
                  "%s%s %s\n",
                  idl_global->prog_name(),
                  ACE_TEXT (": parsing"),
                  s));
    }

  FE_yyparse ();

  // If there were any errors, stop.
  if (idl_global->err_count () > 0)
    {
      ACE_ERROR ((LM_ERROR,
                  "%s%s %s%s %d %s%s\n",
                  idl_global->prog_name (),
                  ACE_TEXT (":"),
                  s,
                  ACE_TEXT (": found"),
                  idl_global->err_count (),
                  ACE_TEXT ("error"),
                  ACE_TEXT ((idl_global->err_count () > 1
                    ? ACE_TEXT ("s")
                    : ACE_TEXT ("")))));

      // Call BE_abort to allow a BE to clean up after itself.
      BE_abort ();

      ACE_OS::exit (ACE_static_cast (int, idl_global->err_count ()));
    }

  // Dump the code.
  if ((idl_global->compile_flags () & IDL_CF_INFORMATIVE)
      && (idl_global->compile_flags () & IDL_CF_DUMP_AST))
    {
      ACE_DEBUG ((LM_DEBUG,
                  "%s%s %s\n",
                  idl_global->prog_name (),
                  ACE_TEXT (": dump"),
                  s));
    }

  if (idl_global->compile_flags () & IDL_CF_DUMP_AST)
    {
      ACE_DEBUG ((LM_DEBUG,
                  ACE_TEXT ("Dump of AST:\n")));

      idl_global->root ()->dump (*ACE_DEFAULT_LOG_STREAM);
    }

  // Call the main entry point for the BE.
  if (idl_global->compile_flags () & IDL_CF_INFORMATIVE)
    {
      ACE_DEBUG ((LM_DEBUG,
                  "%s%s %s\n",
                  idl_global->prog_name (),
                  ACE_TEXT (": BE processing on"),
                  s));
    }

  // Make sure all forward declared structs and unions are defined
  // before proceeding to code generation.
  AST_check_fwd_decls ();
  long error_count = idl_global->err_count ();

  if (error_count == 0)
    {
      BE_produce ();
    }
  else
    {
      ACE_OS::exit (ACE_static_cast (int,
                                     error_count));
    }

  // Exit cleanly.
  ACE_OS::exit (0);
}

// Fork off a process, wait for it to die.
void
DRV_fork (void)
{
  for (DRV_file_index = 0;
       DRV_file_index < DRV_nfiles;
       ++DRV_file_index)
    {
      ACE_Process_Options options (1,
                                   TAO_IDL_COMMAND_LINE_BUFFER_SIZE);
      options.creation_flags (ACE_Process_Options::NO_EXEC);
      options.command_line ("%s %s %s",
                            idl_global->prog_name (),
                            idl_global->idl_flags (),
                            DRV_files[DRV_file_index]);
      ACE_Process manager;
      pid_t child_pid = manager.spawn (options);

      if (child_pid == 0)
        {
          // OK, do it to this file (in the child).
          DRV_drive (DRV_files[DRV_file_index]);
          ACE_OS::exit (0);
        }

      if (child_pid == ACE_INVALID_PID)
        {
          ACE_ERROR ((LM_ERROR,
                      ACE_TEXT ("IDL: spawn failed\n")));

          ACE_OS::exit (99);
        }

      // child_pid is the process id of something at this point.
      if (manager.wait () == -1)
        {
          ACE_ERROR ((LM_ERROR,
                      ACE_TEXT ("IDL: wait failed\n")));

          ACE_OS::exit (99);
        }
    }

  // Now the parent process can exit.
  ACE_OS::exit (0);
}

/*
** LOGIC:
**
** 1. Initialize compiler driver
** 2. Parse command line args
** 3. If more than one file to parse, fork
** 4. Otherwise, for the single file, invoke DRV_drive
*/

int
main (int argc, char *argv[])
{
  // Initialize driver and global variables.
  DRV_init ();

  // Parse arguments.
  DRV_parse_args (argc, argv);

  // If a version message is requested, print it and exit.
  if (idl_global->compile_flags () & IDL_CF_VERSION)
    {
      DRV_version ();
      ACE_OS::exit (0);
    }

  // If a usage message is requested, give it and exit.
  if (idl_global->compile_flags () & IDL_CF_ONLY_USAGE)
    {
      DRV_usage ();
      ACE_OS::exit (0);
    }

  // Fork off a process for each file to process. Fork only if
  // there is more than one file to process.
  if (DRV_nfiles > 1)
    {
      // DRV_fork never returns.
      DRV_fork ();
    }
  else
    {
      // Do the one file we have to parse.
      // Check if stdin and handle file name appropriately.
      if (DRV_nfiles == 0)
        {
          DRV_files[0] = "standard input";
        }

      DRV_file_index = 0;
      DRV_drive (DRV_files[DRV_file_index]);
    }

  ACE_OS::exit (0);

  // NOT REACHED
  return 0;
}
