/* trace.c --- tracing output for the RX simulator.

Copyright (C) 2005, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Red Hat, Inc.

This file is part of the GNU simulators.

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 "config.h"
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>

#include "bfd.h"
#include "dis-asm.h"

#include "cpu.h"
#include "mem.h"
#include "load.h"

static int
sim_dis_read (bfd_vma memaddr, bfd_byte * ptr, unsigned int length,
	      struct disassemble_info *info)
{
  int i;

  if (rx_big_endian)
    {
      /* See load.c for an explanation of this.  */
      for (i=0; i<length; i++)
	ptr[i] = mem_get_qi ((memaddr + i) ^ 3);
    }
  else
    mem_get_blk (memaddr, ptr, length);
  return 0;
}

/* Filter out (in place) symbols that are useless for disassembly.
   COUNT is the number of elements in SYMBOLS.
   Return the number of useful symbols. */

static long
remove_useless_symbols (asymbol ** symbols, long count)
{
  register asymbol **in_ptr = symbols, **out_ptr = symbols;

  while (--count >= 0)
    {
      asymbol *sym = *in_ptr++;

      if (strstr (sym->name, "gcc2_compiled"))
	continue;
      if (sym->name == NULL || sym->name[0] == '\0')
	continue;
      if (sym->flags & (BSF_DEBUGGING))
	continue;
      if (bfd_is_und_section (sym->section)
	  || bfd_is_com_section (sym->section))
	continue;

      *out_ptr++ = sym;
    }
  return out_ptr - symbols;
}

static int
compare_symbols (const PTR ap, const PTR bp)
{
  const asymbol *a = *(const asymbol **) ap;
  const asymbol *b = *(const asymbol **) bp;

  if (bfd_asymbol_value (a) > bfd_asymbol_value (b))
    return 1;
  else if (bfd_asymbol_value (a) < bfd_asymbol_value (b))
    return -1;
  return 0;
}

static char opbuf[1000];

static int
op_printf (char *buf, char *fmt, ...)
{
  int ret;
  va_list ap;

  va_start (ap, fmt);
  ret = vsprintf (opbuf + strlen (opbuf), fmt, ap);
  va_end (ap);
  return ret;
}

static bfd *       current_bfd = NULL;
static asymbol **  symtab = NULL;
static int         symcount = 0;
static asection *  code_section = NULL;
static bfd_vma     code_base = 0;
static struct disassemble_info info;

void
sim_disasm_init (bfd *prog)
{
  current_bfd = prog;
}

typedef struct Files
{
  struct Files *next;
  char *filename;
  int nlines;
  char **lines;
  char *data;
} Files;
Files *files = 0;

static char *
load_file_and_line (const char *filename, int lineno)
{
  Files *f;
  for (f = files; f; f = f->next)
    if (strcmp (f->filename, filename) == 0)
      break;
  if (!f)
    {
      int i;
      struct stat s;
      const char *found_filename, *slash;

      found_filename = filename;
      while (1)
	{
	  if (stat (found_filename, &s) == 0)
	    break;
	  slash = strchr (found_filename, '/');
	  if (!slash)
	    return "";
	  found_filename = slash + 1;
	}

      f = (Files *) malloc (sizeof (Files));
      f->next = files;
      files = f;
      f->filename = strdup (filename);
      f->data = (char *) malloc (s.st_size + 2);
      FILE *file = fopen (found_filename, "rb");
      fread (f->data, 1, s.st_size, file);
      f->data[s.st_size] = 0;
      fclose (file);

      f->nlines = 1;
      for (i = 0; i < s.st_size; i++)
	if (f->data[i] == '\n')
	  f->nlines++;
      f->lines = (char **) malloc (f->nlines * sizeof (char *));
      f->lines[0] = f->data;
      f->nlines = 1;
      for (i = 0; i < s.st_size; i++)
	if (f->data[i] == '\n')
	  {
	    f->lines[f->nlines] = f->data + i + 1;
	    while (*f->lines[f->nlines] == ' '
		   || *f->lines[f->nlines] == '\t')
	      f->lines[f->nlines]++;
	    f->nlines++;
	    f->data[i] = 0;
	  }
    }
  if (lineno < 1 || lineno > f->nlines)
    return "";
  return f->lines[lineno - 1];
}

int
sim_get_current_source_location (const char **  pfilename,
				 const char **  pfunctionname,
				 unsigned int * plineno)
{
  static int   initted = 0;
  int          mypc = get_reg (pc);

  if (current_bfd == NULL)
    return 0;

  if (!initted)
    {
      int storage;
      asection * s;

      initted = 1;
      memset (& info, 0, sizeof (info));
      INIT_DISASSEMBLE_INFO (info, stdout, op_printf);
      info.read_memory_func = sim_dis_read;
      info.arch = bfd_get_arch (current_bfd);
      info.mach = bfd_get_mach (current_bfd);
      if (info.mach == 0)
	info.arch = bfd_arch_rx;

      disassemble_init_for_target (& info);

      storage = bfd_get_symtab_upper_bound (current_bfd);
      if (storage > 0)
	{
	  symtab = (asymbol **) malloc (storage);
	  symcount = bfd_canonicalize_symtab (current_bfd, symtab);
	  symcount = remove_useless_symbols (symtab, symcount);
	  qsort (symtab, symcount, sizeof (asymbol *), compare_symbols);
	}

      for (s = current_bfd->sections; s; s = s->next)
	{
	  if (s->flags & SEC_CODE || code_section == 0)
	    {
	      code_section = s;
	      code_base = bfd_section_lma (current_bfd, s);
	      break;
	    }
	}
    }

  *pfilename = *pfunctionname = NULL;
  *plineno = 0;

  bfd_find_nearest_line
    (current_bfd, code_section, symtab, mypc - code_base,
     pfilename, pfunctionname, plineno);

  return 1;
}

void
sim_disasm_one (void)
{
  static int           last_sym = -1;
  static const char *  prev_filename = "";
  static int           prev_lineno = 0;
  const char *  filename;
  const char *  functionname;
  unsigned int  lineno;
  int           sym, bestaddr;
  int           min, max, i;
  int           save_trace = trace;
  int           mypc = get_reg (pc);

  if (! sim_get_current_source_location (& filename, & functionname, & lineno))
    return;

  trace = 0;

  if (filename && functionname && lineno)
    {
      if (lineno != prev_lineno || strcmp (prev_filename, filename))
	{
	  char *       the_line = load_file_and_line (filename, lineno);
	  const char * slash = strrchr (filename, '/');

	  if (!slash)
	    slash = filename;
	  else
	    slash++;
	  printf
	    ("========================================"
	     "=====================================\n");
	  printf ("\033[37;41m %s:%d: \033[33;40m %s\033[K\033[0m\n",
		  slash, lineno, the_line);
	}
      prev_lineno = lineno;
      prev_filename = filename;
    }

  min = -1;
  max = symcount;
  while (min < max - 1)
    {
      bfd_vma sa;

      sym = (min + max) / 2;
      sa = bfd_asymbol_value (symtab[sym]);
      /*printf("checking %4d %08x %s\n",
	sym, sa, bfd_asymbol_name (symtab[sym])); */
      if (sa > mypc)
	max = sym;
      else if (sa < mypc)
	min = sym;
      else
	{
	  min = sym;
	  break;
	}
    }

  if (min != -1 && min != last_sym)
    {
      bestaddr = bfd_asymbol_value (symtab[min]);
      printf ("\033[43;30m%s", bfd_asymbol_name (symtab[min]));
      if (bestaddr != mypc)
	printf ("+%d", mypc - bestaddr);
      printf (":\t\t\t\033[0m\n");
      last_sym = min;
#if 0
      if (trace == 1)
	if (strcmp (bfd_asymbol_name (symtab[min]), "abort") == 0
	    || strcmp (bfd_asymbol_name (symtab[min]), "exit") == 0)
	  trace = 0;
#endif
    }

  opbuf[0] = 0;
#ifdef CYCLE_ACCURATE
  printf ("\033[33m %04u %06x: ", (int)(regs.cycle_count % 10000), mypc);
#else
  printf ("\033[33m %06x: ", mypc);

#endif

  max = print_insn_rx (mypc, & info);

  for (i = 0; i < max; i++)
    {
      if (rx_big_endian)
	printf ("%02x", mem_get_qi ((mypc + i) ^ 3));
      else
	printf ("%02x", mem_get_qi (mypc + i));
    }

  do
    {
      printf ("  ");
      i ++;
    }
  while (i < 6);

  printf ("%-16s  ", opbuf);

  printf ("\033[0m\n");
  trace = save_trace;
}