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/* generate.c -- generates file execgen.c from instruction set

   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org

   Copyright (C) 2005 György `nog' Jeney, nog@sdf.lonestar.org

This file is part of OpenRISC 1000 Architectural Simulator.

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 2 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, write to the Free Software

Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <stdarg.h>

#include <ctype.h>

#include "config.h"

#include "opcode/or32.h"

#include "abstract.h"

static char *in_file;

static char *out_file;

/* Whether this instruction stores something in register */

static int write_to_reg;

static int out_lines = 0;

void debug(int level, const char *format, ...)

{

#if DEBUG

  char *p;

  va_list ap;

  if ((p = malloc(1000)) == NULL)

    return;

  va_start(ap, format);

  (void) vsnprintf(p, 1000, format, ap);

  va_end(ap);

  printf("%s\n", p);

  fflush(stdout);

  free(p);

#endif

}

static int shift_fprintf(int level, FILE *f, const char *fmt, ...)

{

  va_list ap;

  int i;

  va_start(ap, fmt);

  for(i = 0; i < level; i++)

    fprintf(f, "  ");

  i = vfprintf(f, fmt, ap);

  va_end(ap);

  out_lines++;

  return i + (level * 2);

}

/* Generates a execute sequence for one instruction */

int output_function (FILE *fo, const char *func_name, int level)

{

  FILE *fi;

  int olevel;

  int line_num = 0;

  if ((fi = fopen (in_file, "rt")) == NULL) {

    printf("could not open file\n");

    return 1;

  }

  while (!feof (fi)) {

    char line[10000], *str = line;

    fgets (str, sizeof (line), fi);

    line[sizeof (line) - 1] = 0;

    line_num++;

    if (strncmp (str, "INSTRUCTION (", 13) == 0) {

      char *s;

      str += 13;

      while (isspace (*str)) str++;

      s = str;

      while (*s && *s != ')') s++;

      *s = 0;

      while (isspace(*(s - 1))) s--;

      *s = 0;

      if (strcmp (str, func_name) == 0) {

        olevel = 1;

        str += strlen (str) + 1;

        while (isspace (*str)) str++;

        s = str;

        while (*s && *s != '\n' && *s != '\r') s++;

        *s = 0;

        while (isspace(*(s - 1))) s--;

        *s = 0;

        /*shift_fprintf (level, fo, "#line %i \"%s\"\n", line_num, in_file);*/

        shift_fprintf (level, fo, "%s", str);

        shift_fprintf (level, fo, "   /* \"%s\" */\n", func_name);

        do {

          fgets (line, sizeof (line), fi);

          line[sizeof(line) - 1] = 0;

          for (str = line; *str; str++) {

            if (*str == '{') olevel++;

            else if (*str == '}') olevel--;

          }

          shift_fprintf (level, fo, "%s", line);

        } while (olevel);

        fclose(fi);

        /*shift_fprintf (level, fo, "#line %i \"%s\"\n", out_lines, out_file);*/

        return 0;

      }

    }

  }

  shift_fprintf (level, fo, "%s ();\n", func_name);

  fclose(fi);

  return 0;

}

/* Parses operands. */

static int

gen_eval_operands (FILE *fo, int insn_index, int level)

{

  struct insn_op_struct *opd = op_start[insn_index];

  int i;

  int num_ops;

  int nbits = 0;

  int set_param = 0;

  int dis = 0;

  int sbit;

  int dis_op = -1;

  write_to_reg = 0;

  shift_fprintf (level, fo, "unsigned long ");

  /* Count number of operands */

  for (i = 0, num_ops = 0;; i++) {

    if (!(opd[i].type & OPTYPE_OP))

      continue;

    if (opd[i].type & OPTYPE_DIS)

      continue;

    if (num_ops)

      fprintf(fo, ", ");

    fprintf(fo, "%c", 'a' + num_ops);

    num_ops++;

    if (opd[i].type & OPTYPE_LAST)

      break;

  }

  fprintf (fo, ";\n");

  shift_fprintf (level, fo, "/* Number of operands: %i */\n", num_ops);

  i = 0;

  num_ops = 0;

  do {

/*

    printf("opd[%i].type<last> = %c\n", i, opd->type & OPTYPE_LAST ? '1' : '0');    printf("opd[%i].type<op> = %c\n", i, opd->type & OPTYPE_OP ? '1' : '0');

    printf("opd[%i].type<reg> = %c\n", i, opd->type & OPTYPE_REG ? '1' : '0');

    printf("opd[%i].type<sig> = %c\n", i, opd->type & OPTYPE_SIG ? '1' : '0');

    printf("opd[%i].type<dis> = %c\n", i, opd->type & OPTYPE_DIS ? '1' : '0');

    printf("opd[%i].type<shr> = %i\n", i, opd->type & OPTYPE_SHR);

    printf("opd[%i].type<sbit> = %i\n", i, (opd->type & OPTYPE_SBIT) >> OPTYPE_SBIT_SHR);

    printf("opd[%i].data = %i\n", i, opd->data);

*/

    if (!nbits)

      shift_fprintf (level, fo, "%c = (insn >> %i) & 0x%x;\n", 'a' + num_ops,

                     opd->type & OPTYPE_SHR, (1 << opd->data) - 1);

    else

      shift_fprintf (level, fo, "%c |= ((insn >> %i) & 0x%x) << %i;\n",

                     'a' + num_ops, opd->type & OPTYPE_SHR,

                     (1 << opd->data) - 1, nbits);

    nbits += opd->data;

    if ((opd->type & OPTYPE_DIS) && (opd->type & OPTYPE_OP)) {

      sbit = (opd->type & OPTYPE_SBIT) >> OPTYPE_SBIT_SHR;

      if (opd->type & OPTYPE_SIG)

        shift_fprintf (level, fo, "if(%c & 0x%08x) %c |= 0x%x;\n",

                       'a' + num_ops, 1 << sbit, 'a' + num_ops,

                       0xffffffff << sbit);

      opd++;

      shift_fprintf (level, fo, "(signed)%c += (signed)reg[(insn >> %i) & 0x%x];\n",

                     'a' + num_ops, opd->type & OPTYPE_SHR,

                     (1 << opd->data) - 1);

      dis = 1;

      dis_op = num_ops;

    }

    if (opd->type & OPTYPE_OP) {

      sbit = (opd->type & OPTYPE_SBIT) >> OPTYPE_SBIT_SHR;

      if (opd->type & OPTYPE_SIG)

        shift_fprintf (level, fo, "if(%c & 0x%08x) %c |= 0x%x;\n",

                       'a' + num_ops, 1 << sbit, 'a' + num_ops,

                       0xffffffff << sbit);

      if ((opd->type & OPTYPE_REG) && !dis) {

        if(!i) {

          shift_fprintf (level, fo, "#define SET_PARAM0(val) reg[a] = val\n");

          set_param = 1;

        }

        shift_fprintf (level, fo, "#define PARAM%i reg[%c]\n", num_ops,

                      'a' + num_ops);

        if(opd->type & OPTYPE_DST)

          write_to_reg = 1;

      } else {

        shift_fprintf (level, fo, "#define PARAM%i %c\n", num_ops,

                       'a' + num_ops);

      }

      num_ops++;

      nbits = 0;

      dis = 0;

    }

    if ((opd->type & OPTYPE_LAST))

      break;

    opd++;

    i++;

  } while (1);

  output_function (fo, or32_opcodes[insn_index].function_name, level);

  if (set_param)

    shift_fprintf (level, fo, "#undef SET_PARAM\n");

  for (i = 0; i < num_ops; i++)

    shift_fprintf (level, fo, "#undef PARAM%i\n", i);

  return dis_op;

}

/* Generates decode and execute for one instruction instance */

static int output_call (FILE *fo, int index, int level)

{

  int dis_op = -1;

  /*printf ("%i:%s\n", index, insn_name (index));*/

  shift_fprintf (level++, fo, "{\n");

  if (index >= 0)

    dis_op = gen_eval_operands (fo, index, level);

  if (index < 0) output_function (fo, "l_invalid", level);

  fprintf (fo, "\n");

  shift_fprintf (level++, fo, "if (do_stats) {\n");

  if (dis_op >= 0)

    shift_fprintf (level, fo, "insn_ea = %c;\n", 'a' + dis_op);

  shift_fprintf (level, fo, "current->insn_index = %i;   /* \"%s\" */\n", index,

                 insn_name (index));

  shift_fprintf (level, fo, "analysis(current);\n");

  shift_fprintf (--level, fo, "}\n");

  if (write_to_reg)

    shift_fprintf (level, fo, "reg[0] = 0; /* Repair in case we changed it */\n");

  shift_fprintf (--level, fo, "}\n");

  return 0;

}

/* Generates .c file header */

static int generate_header (FILE *fo)

{

  fprintf (fo, "/* This file was automatically generated by generate (see cpu/or32/generate.c) */\n\n");

  fprintf (fo, "static inline void decode_execute (struct iqueue_entry *current)\n{\n");

  fprintf (fo, "  unsigned long insn = current->insn;\n");

  out_lines = 5;

  return 0;

}

/* Generates .c file footer */

static int generate_footer (FILE *fo)

{

  fprintf (fo, "}\n");

  return 0;

}

/* Decodes all instructions and generates code for that.  This function

   is similar to insn_decode, except it decodes all instructions. */

static int generate_body (FILE *fo, unsigned long *a, unsigned long cur_mask, int level)

{

  unsigned long shift = *a;

  unsigned long mask;

  int i;

  int prev_inv = 0;

  if (!(*a & LEAF_FLAG)) {

    shift = *a++;

    mask = *a++;

    shift_fprintf (level, fo, "switch((insn >> %i) & 0x%x) {\n", shift,

                   mask);

    for (i = 0; i <= mask; i++, a++) {

      if (!*a) {

        shift_fprintf (level, fo, "case 0x%x:\n", i);

        prev_inv = 1;

      } else {

        if(prev_inv) {

          shift_fprintf (++level, fo, "/* Invalid instruction(s) */\n");

          shift_fprintf (level--, fo, "break;\n");

        }

        shift_fprintf (level, fo, "case 0x%x:\n", i);

        generate_body (fo, automata + *a, cur_mask | (mask << shift), ++level);

        shift_fprintf (level--, fo, "break;\n");

        prev_inv = 0;

      }

    }

    if (prev_inv) {

      shift_fprintf (++level, fo, "/* Invalid instruction(s) */\n");

      shift_fprintf (level--, fo, "break;\n");

    }

    shift_fprintf (level, fo, "}\n");

  } else {

    i = *a & ~LEAF_FLAG;

    /* Final check - do we have direct match?

       (based on or32_opcodes this should be the only possibility,

       but in case of invalid/missing instruction we must perform a check)  */

    if (ti[i].insn_mask != cur_mask) {

      shift_fprintf (level, fo, "/* Not unique: real mask %08lx and current mask %08lx differ - do final check */\n", ti[i].insn_mask, cur_mask);

      shift_fprintf (level++, fo, "if((insn & 0x%x) == 0x%x) {\n",

                     ti[i].insn_mask, ti[i].insn);

    }

    shift_fprintf (level, fo, "/* Instruction: %s */\n", or32_opcodes[i].name);

    output_call (fo, i, level);

    if (ti[i].insn_mask != cur_mask) {

      shift_fprintf (--level, fo, "} else {\n");

      shift_fprintf (++level, fo, "/* Invalid insn */\n");

      output_call (fo, -1, level);

      shift_fprintf (--level, fo, "}\n");

    }

  }

  return 0;

}

/* Main function; it takes two parameters:

   input_file(possibly insnset.c) output_file(possibly execgen.c)*/

int main (int argc, char *argv[])

{

  FILE *fo;

  if (argc != 3) {

    fprintf (stderr, "USAGE: generate input_file(possibly insnset.c) output_file(possibly execgen.c)\n");

    exit (-1);

  }

  in_file = argv[1];

  out_file = argv[2];

  if (!(fo = fopen (argv[2], "wt+"))) {

    fprintf (stderr, "Cannot create '%s'.\n", argv[2]);

    exit (1);

  }

  build_automata ();

  if (generate_header (fo)) {

    fprintf (stderr, "generate_header\n");

    return 1;

  }

  if (generate_body (fo, automata, 0, 1)) {

    fprintf (stderr, "generate_body\n");

    return 1;

  }

  if (generate_footer (fo)) {

    fprintf (stderr, "generate_footer\n");

    return 1;

  }

  fclose (fo);

  destruct_automata ();

  return 0;

}