/* The IGEN simulator generator for GDB, the GNU Debugger.

   Copyright 2002-2021 Free Software Foundation, Inc.

   Contributed by Andrew Cagney.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */


#include "misc.h"
#include "lf.h"
#include "table.h"
#include "filter.h"
#include "igen.h"

#include "ld-insn.h"
#include "ld-decode.h"

#include "gen.h"

#include "gen-itable.h"


typedef struct _itable_info
{
  int sizeof_form;
  int sizeof_name;
  int sizeof_file;
}
itable_info;


static void
itable_h_insn (lf *file,
	       insn_table *entry, insn_entry * instruction, void *data)
{
  int len;
  itable_info *info = data;
  lf_print__line_ref (file, instruction->line);
  lf_printf (file, "  ");
  print_function_name (file,
		       instruction->name,
		       instruction->format_name,
		       NULL, NULL, function_name_prefix_itable);
  lf_printf (file, ",\n");
  /* update summary info */
  len = strlen (instruction->format_name);
  if (info->sizeof_form <= len)
    info->sizeof_form = len + 1;
  len = strlen (instruction->name);
  if (info->sizeof_name <= len)
    info->sizeof_name = len + 1;
  len = strlen (filter_filename (instruction->line->file_name));
  if (info->sizeof_file <= len)
    info->sizeof_file = len + 1;
}


/* print the list of all the different options */

static void
itable_print_enum (lf *file, filter *set, char *name)
{
  char *elem;
  lf_printf (file, "typedef enum {\n");
  lf_indent (file, +2);
  for (elem = filter_next (set, "");
       elem != NULL; elem = filter_next (set, elem))
    {
      lf_printf (file, "%sitable_%s_%s,\n",
		 options.module.itable.prefix.l, name, elem);
      if (strlen (options.module.itable.prefix.l) > 0)
	{
	  lf_indent_suppress (file);
	  lf_printf (file, "#define itable_%s_%s %sitable_%s_%s\n",
		     name, elem, options.module.itable.prefix.l, name, elem);
	}
    }
  lf_printf (file, "nr_%sitable_%ss,\n", options.module.itable.prefix.l,
	     name);

  lf_indent (file, -2);
  lf_printf (file, "} %sitable_%ss;\n", options.module.itable.prefix.l, name);
  if (strlen (options.module.itable.prefix.l) > 0)
    {
      lf_indent_suppress (file);
      lf_printf (file, "#define itable_%ss %sitable_%ss\n",
		 name, options.module.itable.prefix.l, name);
      lf_indent_suppress (file);
      lf_printf (file, "#define nr_itable_%ss nr_%sitable_%ss\n",
		 name, options.module.itable.prefix.l, name);
    }
}

/* print an array of the option names as strings */

static void
itable_print_names (lf *file, filter *set, char *name)
{
  char *elem;
  lf_printf (file, "const char *%sitable_%s_names[nr_%sitable_%ss + 1] = {\n",
	     options.module.itable.prefix.l, name,
	     options.module.itable.prefix.l, name);
  lf_indent (file, +2);
  for (elem = filter_next (set, "");
       elem != NULL; elem = filter_next (set, elem))
    {
      lf_printf (file, "\"%s\",\n", elem);
    }
  lf_printf (file, "0,\n");
  lf_indent (file, -2);
  lf_printf (file, "};\n");
}

extern void
gen_itable_h (lf *file, insn_table *isa)
{
  itable_info *info = ZALLOC (itable_info);

  /* output an enumerated type for each instruction */
  lf_printf (file, "typedef enum {\n");
  insn_table_traverse_insn (file, isa, itable_h_insn, info);
  lf_printf (file, "  nr_%sitable_entries,\n",
	     options.module.itable.prefix.l);
  lf_printf (file, "} %sitable_index;\n", options.module.itable.prefix.l);
  lf_printf (file, "\n");

  /* output an enumeration type for each flag */
  itable_print_enum (file, isa->flags, "flag");
  lf_printf (file, "extern const char *%sitable_flag_names[];\n",
	     options.module.itable.prefix.l);
  lf_printf (file, "\n");

  /* output an enumeration of all the possible options */
  itable_print_enum (file, isa->options, "option");
  lf_printf (file, "extern const char *%sitable_option_names[];\n",
	     options.module.itable.prefix.l);
  lf_printf (file, "\n");

  /* output an enumeration of all the processor models */
  itable_print_enum (file, isa->model->processors, "processor");
  lf_printf (file, "extern const char *%sitable_processor_names[];\n",
	     options.module.itable.prefix.l);
  lf_printf (file, "\n");

  /* output the table that contains the actual instruction info */
  lf_printf (file, "typedef struct _%sitable_instruction_info {\n",
	     options.module.itable.prefix.l);
  lf_printf (file, "  %sitable_index nr;\n", options.module.itable.prefix.l);
  lf_printf (file, "  char *format;\n");
  lf_printf (file, "  char *form;\n");
  lf_printf (file, "  char *flags;\n");

  /* nr_itable_* may be zero, so we add 1 to avoid an
     illegal zero-sized array. */
  lf_printf (file, "  char flag[nr_%sitable_flags + 1];\n",
	     options.module.itable.prefix.l);
  lf_printf (file, "  char *options;\n");
  lf_printf (file, "  char option[nr_%sitable_options + 1];\n",
	     options.module.itable.prefix.l);
  lf_printf (file, "  char *processors;\n");
  lf_printf (file, "  char processor[nr_%sitable_processors + 1];\n",
	     options.module.itable.prefix.l);
  lf_printf (file, "  char *name;\n");
  lf_printf (file, "  char *file;\n");
  lf_printf (file, "  int line_nr;\n");
  lf_printf (file, "} %sitable_info;\n", options.module.itable.prefix.l);
  lf_printf (file, "\n");
  lf_printf (file, "extern %sitable_info %sitable[nr_%sitable_entries];\n",
	     options.module.itable.prefix.l, options.module.itable.prefix.l,
	     options.module.itable.prefix.l);
  if (strlen (options.module.itable.prefix.l) > 0)
    {
      lf_indent_suppress (file);
      lf_printf (file, "#define itable %sitable\n",
		 options.module.itable.prefix.l);
    }
  lf_printf (file, "\n");

  /* output an enum defining the max size of various itable members */
  lf_printf (file, "enum {\n");
  lf_printf (file, "  sizeof_%sitable_form = %d,\n",
	     options.module.itable.prefix.l, info->sizeof_form);
  lf_printf (file, "  sizeof_%sitable_name = %d,\n",
	     options.module.itable.prefix.l, info->sizeof_name);
  lf_printf (file, "  sizeof_%sitable_file = %d,\n",
	     options.module.itable.prefix.l, info->sizeof_file);
  lf_printf (file, "};\n");
}


/****************************************************************/

static void
itable_print_set (lf *file, filter *set, filter *members)
{
  char *elem;
  lf_printf (file, "\"");
  elem = filter_next (members, "");
  if (elem != NULL)
    {
      while (1)
	{
	  lf_printf (file, "%s", elem);
	  elem = filter_next (members, elem);
	  if (elem == NULL)
	    break;
	  lf_printf (file, ",");
	}
    }
  lf_printf (file, "\",\n");

  lf_printf (file, "{");
  for (elem = filter_next (set, "");
       elem != NULL; elem = filter_next (set, elem))
    {
      if (filter_is_member (members, elem))
	{
	  lf_printf (file, " 1,");
	}
      else
	{
	  lf_printf (file, " 0,");
	}

    }
  /* always print a dummy element, to avoid empty initializers. */
  lf_printf (file, " 99 },\n");
}


static void
itable_c_insn (lf *file,
	       insn_table *isa, insn_entry * instruction, void *data)
{
  lf_printf (file, "{ ");
  lf_indent (file, +2);
  print_function_name (file,
		       instruction->name,
		       instruction->format_name,
		       NULL, NULL, function_name_prefix_itable);
  lf_printf (file, ",\n");
  lf_printf (file, "\"");
  print_insn_words (file, instruction);
  lf_printf (file, "\",\n");
  lf_printf (file, "\"%s\",\n", instruction->format_name);

  itable_print_set (file, isa->flags, instruction->flags);
  itable_print_set (file, isa->options, instruction->options);
  itable_print_set (file, isa->model->processors, instruction->processors);

  lf_printf (file, "\"%s\",\n", instruction->name);
  lf_printf (file, "\"%s\",\n",
	     filter_filename (instruction->line->file_name));
  lf_printf (file, "%d,\n", instruction->line->line_nr);
  lf_printf (file, "},\n");
  lf_indent (file, -2);
}


extern void
gen_itable_c (lf *file, insn_table *isa)
{
  /* leader */
  lf_printf (file, "#include \"%sitable.h\"\n",
	     options.module.itable.prefix.l);
  lf_printf (file, "\n");

  /* FIXME - output model data??? */
  /* FIXME - output assembler data??? */

  /* output the flag, option and processor name tables */
  itable_print_names (file, isa->flags, "flag");
  itable_print_names (file, isa->options, "option");
  itable_print_names (file, isa->model->processors, "processor");

  /* output the table that contains the actual instruction info */
  lf_printf (file, "%sitable_info %sitable[nr_%sitable_entries] = {\n",
	     options.module.itable.prefix.l,
	     options.module.itable.prefix.l, options.module.itable.prefix.l);
  insn_table_traverse_insn (file, isa, itable_c_insn, NULL);

  lf_printf (file, "};\n");
}