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/* coffgrok.c

   Copyright 1994, 1995, 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005,

   2007, 2009  Free Software Foundation, Inc.

   This file is part of GNU Binutils.

   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, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

   MA 02110-1301, USA.  */

/* Written by Steve Chamberlain (sac@cygnus.com)

   This module reads a coff file and builds a really simple type tree

   which can be read by other programs.  The first application is a

   coff->sysroff converter.  It can be tested with coffdump.c.  */

#include "sysdep.h"

#include "bfd.h"

#include "libiberty.h"

#include "coff/internal.h"

#include "../bfd/libcoff.h"

#include "bucomm.h"

#include "coffgrok.h"

static int lofile = 1;

static struct coff_scope *top_scope;

static struct coff_scope *file_scope;

static struct coff_ofile *ofile;

static struct coff_symbol *last_function_symbol;

static struct coff_type *last_function_type;

static struct coff_type *last_struct;

static struct coff_type *last_enum;

static struct coff_sfile *cur_sfile;

static struct coff_symbol **tindex;

static asymbol **syms;

static long symcount;

#define N(x) ((x)->_n._n_nptr[1])

static struct coff_ptr_struct *rawsyms;

static int rawcount;

static bfd *abfd;

#define PTR_SIZE        4

#define SHORT_SIZE      2

#define INT_SIZE        4

#define LONG_SIZE       4

#define FLOAT_SIZE      4

#define DOUBLE_SIZE     8

#define INDEXOF(p)  ((struct coff_ptr_struct *)(p)-(rawsyms))

static struct coff_scope *empty_scope (void);

static struct coff_symbol *empty_symbol (void);

static void push_scope (int);

static void pop_scope (void);

static void do_sections_p1 (struct coff_ofile *);

static void do_sections_p2 (struct coff_ofile *);

static struct coff_where *do_where (int);

static struct coff_line *do_lines (int, char *);

static struct coff_type *do_type (int);

static struct coff_visible *do_visible (int);

static int do_define (int, struct coff_scope *);

static struct coff_ofile *doit (void);

static struct coff_scope *

empty_scope (void)

{

  struct coff_scope *l;

  l = (struct coff_scope *) (xcalloc (sizeof (struct coff_scope), 1));

  return l;

}

static struct coff_symbol *

empty_symbol (void)

{

  return (struct coff_symbol *) (xcalloc (sizeof (struct coff_symbol), 1));

}

/*int l;*/

static void

push_scope (int slink)

{

  struct coff_scope *n = empty_scope ();

  if (slink)

    {

      if (top_scope)

        {

          if (top_scope->list_tail)

            {

              top_scope->list_tail->next = n;

            }

          else

            {

              top_scope->list_head = n;

            }

          top_scope->list_tail = n;

        }

    }

  n->parent = top_scope;

  top_scope = n;

}

static void

pop_scope (void)

{

  top_scope = top_scope->parent;

}

static void

do_sections_p1 (struct coff_ofile *head)

{

  asection *section;

  int idx;

  struct coff_section *all = (struct coff_section *) (xcalloc (abfd->section_count + 1,

                                             sizeof (struct coff_section)));

  head->nsections = abfd->section_count + 1;

  head->sections = all;

  for (idx = 0, section = abfd->sections; section; section = section->next, idx++)

    {

      long relsize;

      int i = section->target_index;

      arelent **relpp;

      long relcount;

      relsize = bfd_get_reloc_upper_bound (abfd, section);

      if (relsize < 0)

        bfd_fatal (bfd_get_filename (abfd));

      if (relsize == 0)

        continue;

      relpp = (arelent **) xmalloc (relsize);

      relcount = bfd_canonicalize_reloc (abfd, section, relpp, syms);

      if (relcount < 0)

        bfd_fatal (bfd_get_filename (abfd));

      head->sections[i].name = (char *) (section->name);

      head->sections[i].code = section->flags & SEC_CODE;

      head->sections[i].data = section->flags & SEC_DATA;

      if (strcmp (section->name, ".bss") == 0)

        head->sections[i].data = 1;

      head->sections[i].address = section->lma;

      head->sections[i].size = bfd_get_section_size (section);

      head->sections[i].number = idx;

      head->sections[i].nrelocs = section->reloc_count;

      head->sections[i].relocs =

        (struct coff_reloc *) (xcalloc (section->reloc_count,

                                        sizeof (struct coff_reloc)));

      head->sections[i].bfd_section = section;

    }

  head->sections[0].name = "ABSOLUTE";

  head->sections[0].code = 0;

  head->sections[0].data = 0;

  head->sections[0].address = 0;

  head->sections[0].size = 0;

  head->sections[0].number = 0;

}

static void

do_sections_p2 (struct coff_ofile *head)

{

  asection *section;

  for (section = abfd->sections; section; section = section->next)

    {

      unsigned int j;

      for (j = 0; j < section->reloc_count; j++)

        {

          int idx;

          int i = section->target_index;

          struct coff_reloc *r = head->sections[i].relocs + j;

          arelent *sr = section->relocation + j;

          r->offset = sr->address;

          r->addend = sr->addend;

          idx = ((coff_symbol_type *) (sr->sym_ptr_ptr[0]))->native - rawsyms;

          r->symbol = tindex[idx];

        }

    }

}

static struct coff_where *

do_where (int i)

{

  struct internal_syment *sym = &rawsyms[i].u.syment;

  struct coff_where *where =

    (struct coff_where *) (xmalloc (sizeof (struct coff_where)));

  where->offset = sym->n_value;

  if (sym->n_scnum == -1)

    sym->n_scnum = 0;

  switch (sym->n_sclass)

    {

    case C_FIELD:

      where->where = coff_where_member_of_struct;

      where->offset = sym->n_value / 8;

      where->bitoffset = sym->n_value % 8;

      where->bitsize = rawsyms[i + 1].u.auxent.x_sym.x_misc.x_lnsz.x_size;

      break;

    case C_MOE:

      where->where = coff_where_member_of_enum;

      break;

    case C_MOS:

    case C_MOU:

      where->where = coff_where_member_of_struct;

      break;

    case C_AUTO:

    case C_ARG:

      where->where = coff_where_stack;

      break;

    case C_EXT:

    case C_STAT:

    case C_EXTDEF:

    case C_LABEL:

      where->where = coff_where_memory;

      where->section = &ofile->sections[sym->n_scnum];

      break;

    case C_REG:

    case C_REGPARM:

      where->where = coff_where_register;

      break;

    case C_ENTAG:

      where->where = coff_where_entag;

      break;

    case C_STRTAG:

    case C_UNTAG:

      where->where = coff_where_strtag;

      break;

    case C_TPDEF:

      where->where = coff_where_typedef;

      break;

    default:

      abort ();

      break;

    }

  return where;

}

static

struct coff_line *

do_lines (int i, char *name ATTRIBUTE_UNUSED)

{

  struct coff_line *res = (struct coff_line *) xcalloc (sizeof (struct coff_line), 1);

  asection *s;

  unsigned int l;

  /* Find out if this function has any line numbers in the table */

  for (s = abfd->sections; s; s = s->next)

    {

      for (l = 0; l < s->lineno_count; l++)

        {

          if (s->lineno[l].line_number == 0)

            {

              if (rawsyms + i == ((coff_symbol_type *) (&(s->lineno[l].u.sym[0])))->native)

                {

                  /* These lines are for this function - so count them and stick them on */

                  int c = 0;

                  /* Find the linenumber of the top of the function, since coff linenumbers

                     are relative to the start of the function.  */

                  int start_line = rawsyms[i + 3].u.auxent.x_sym.x_misc.x_lnsz.x_lnno;

                  l++;

                  for (c = 0; s->lineno[l + c + 1].line_number; c++)

                    ;

                  /* Add two extra records, one for the prologue and one for the epilogue */

                  c += 1;

                  res->nlines = c;

                  res->lines = (int *) (xcalloc (sizeof (int), c));

                  res->addresses = (int *) (xcalloc (sizeof (int), c));

                  res->lines[0] = start_line;

                  res->addresses[0] = rawsyms[i].u.syment.n_value - s->vma;

                  for (c = 0; s->lineno[l + c + 1].line_number; c++)

                    {

                      res->lines[c + 1] = s->lineno[l + c].line_number + start_line - 1;

                      res->addresses[c + 1] = s->lineno[l + c].u.offset;

                    }

                  return res;

                }

            }

        }

    }

  return res;

}

static

struct coff_type *

do_type (int i)

{

  struct internal_syment *sym = &rawsyms[i].u.syment;

  union internal_auxent *aux = &rawsyms[i + 1].u.auxent;

  struct coff_type *res =

    (struct coff_type *) xmalloc (sizeof (struct coff_type));

  int type = sym->n_type;

  int which_dt = 0;

  int dimind = 0;

  res->type = coff_basic_type;

  res->u.basic = type & 0xf;

  switch (type & 0xf)

    {

    case T_NULL:

    case T_VOID:

      if (sym->n_numaux && sym->n_sclass == C_STAT)

        {

          /* This is probably a section definition */

          res->type = coff_secdef_type;

          res->size = aux->x_scn.x_scnlen;

        }

      else

        {

          if (type == 0)

            {

              /* Don't know what this is, let's make it a simple int */

              res->size = INT_SIZE;

              res->u.basic = T_UINT;

            }

          else

            {

              /* Else it could be a function or pointer to void */

              res->size = 0;

            }

        }

      break;

      break;

    case T_UCHAR:

    case T_CHAR:

      res->size = 1;

      break;

    case T_USHORT:

    case T_SHORT:

      res->size = SHORT_SIZE;

      break;

    case T_UINT:

    case T_INT:

      res->size = INT_SIZE;

      break;

    case T_ULONG:

    case T_LONG:

      res->size = LONG_SIZE;

      break;

    case T_FLOAT:

      res->size = FLOAT_SIZE;

      break;

    case T_DOUBLE:

      res->size = DOUBLE_SIZE;

      break;

    case T_STRUCT:

    case T_UNION:

      if (sym->n_numaux)

        {

          if (aux->x_sym.x_tagndx.p)

            {

              /* Referring to a struct defined elsewhere */

              res->type = coff_structref_type;

              res->u.astructref.ref = tindex[INDEXOF (aux->x_sym.x_tagndx.p)];

              res->size = res->u.astructref.ref ?

                res->u.astructref.ref->type->size : 0;

            }

          else

            {

              /* A definition of a struct */

              last_struct = res;

              res->type = coff_structdef_type;

              res->u.astructdef.elements = empty_scope ();

              res->u.astructdef.idx = 0;

              res->u.astructdef.isstruct = (type & 0xf) == T_STRUCT;

              res->size = aux->x_sym.x_misc.x_lnsz.x_size;

            }

        }

      else

        {

          /* No auxents - it's anonymous */

          res->type = coff_structref_type;

          res->u.astructref.ref = 0;

          res->size = 0;

        }

      break;

    case T_ENUM:

      if (aux->x_sym.x_tagndx.p)

        {

          /* Referring to a enum defined elsewhere */

          res->type = coff_enumref_type;

          res->u.aenumref.ref = tindex[INDEXOF (aux->x_sym.x_tagndx.p)];

          res->size = res->u.aenumref.ref->type->size;

        }

      else

        {

          /* A definition of an enum */

          last_enum = res;

          res->type = coff_enumdef_type;

          res->u.aenumdef.elements = empty_scope ();

          res->size = aux->x_sym.x_misc.x_lnsz.x_size;

        }

      break;

    case T_MOE:

      break;

    }

  for (which_dt = 5; which_dt >= 0; which_dt--)

    {

      switch ((type >> ((which_dt * 2) + 4)) & 0x3)

        {

        case 0:

          break;

        case DT_ARY:

          {

            struct coff_type *ptr = ((struct coff_type *)

                                     xmalloc (sizeof (struct coff_type)));

            int els = (dimind < DIMNUM

                       ? aux->x_sym.x_fcnary.x_ary.x_dimen[dimind]

                       : 0);

            ++dimind;

            ptr->type = coff_array_type;

            ptr->size = els * res->size;

            ptr->u.array.dim = els;

            ptr->u.array.array_of = res;

            res = ptr;

            break;

          }

        case DT_PTR:

          {

            struct coff_type *ptr =

              (struct coff_type *) xmalloc (sizeof (struct coff_type));

            ptr->size = PTR_SIZE;

            ptr->type = coff_pointer_type;

            ptr->u.pointer.points_to = res;

            res = ptr;

            break;

          }

        case DT_FCN:

          {

            struct coff_type *ptr

              = (struct coff_type *) xmalloc (sizeof (struct coff_type));

            ptr->size = 0;

            ptr->type = coff_function_type;

            ptr->u.function.function_returns = res;

            ptr->u.function.parameters = empty_scope ();

            ptr->u.function.lines = do_lines (i, sym->_n._n_nptr[1]);

            ptr->u.function.code = 0;

            last_function_type = ptr;

            res = ptr;

            break;

          }

        }

    }

  return res;

}

static struct coff_visible *

do_visible (int i)

{

  struct internal_syment *sym = &rawsyms[i].u.syment;

  struct coff_visible *visible =

    (struct coff_visible *) (xmalloc (sizeof (struct coff_visible)));

  enum coff_vis_type t;

  switch (sym->n_sclass)

    {

    case C_MOS:

    case C_MOU:

    case C_FIELD:

      t = coff_vis_member_of_struct;

      break;

    case C_MOE:

      t = coff_vis_member_of_enum;

      break;

    case C_REGPARM:

      t = coff_vis_regparam;

      break;

    case C_REG:

      t = coff_vis_register;

      break;

    case C_STRTAG:

    case C_UNTAG:

    case C_ENTAG:

    case C_TPDEF:

      t = coff_vis_tag;

      break;

    case C_AUTOARG:

    case C_ARG:

      t = coff_vis_autoparam;

      break;

    case C_AUTO:

      t = coff_vis_auto;

      break;

    case C_LABEL:

    case C_STAT:

      t = coff_vis_int_def;

      break;

    case C_EXT:

      if (sym->n_scnum == N_UNDEF)

        {

          if (sym->n_value)

            t = coff_vis_common;

          else

            t = coff_vis_ext_ref;

        }

      else

        t = coff_vis_ext_def;

      break;

    default:

      abort ();

      break;

    }

  visible->type = t;

  return visible;

}

static int

do_define (int i, struct coff_scope *b)

{

  static int symbol_index;

  struct internal_syment *sym = &rawsyms[i].u.syment;

  /* Define a symbol and attach to block b */

  struct coff_symbol *s = empty_symbol ();

  s->number = ++symbol_index;

  s->name = sym->_n._n_nptr[1];

  s->sfile = cur_sfile;

  /* Glue onto the ofile list */

  if (lofile >= 0)

    {

      if (ofile->symbol_list_tail)

        ofile->symbol_list_tail->next_in_ofile_list = s;

      else

        ofile->symbol_list_head = s;

      ofile->symbol_list_tail = s;

      /* And the block list */

    }

  if (b->vars_tail)

    b->vars_tail->next = s;

  else

    b->vars_head = s;

  b->vars_tail = s;

  b->nvars++;

  s->type = do_type (i);

  s->where = do_where (i);

  s->visible = do_visible (i);

  tindex[i] = s;

  /* We remember the lowest address in each section for each source file */

  if (s->where->where == coff_where_memory

      && s->type->type == coff_secdef_type)

    {

      struct coff_isection *is = cur_sfile->section + s->where->section->number;

      if (!is->init)

        {

          is->low = s->where->offset;

          is->high = s->where->offset + s->type->size;

          is->init = 1;

          is->parent = s->where->section;

        }

    }

  if (s->type->type == coff_function_type)

    last_function_symbol = s;

  return i + sym->n_numaux + 1;

}

static

struct coff_ofile *

doit (void)

{

  int i;

  int infile = 0;

  struct coff_ofile *head =

    (struct coff_ofile *) xmalloc (sizeof (struct coff_ofile));

  ofile = head;

  head->source_head = 0;

  head->source_tail = 0;

  head->nsources = 0;

  head->symbol_list_tail = 0;

  head->symbol_list_head = 0;

  do_sections_p1 (head);

  push_scope (1);

  for (i = 0; i < rawcount;)

    {

      struct internal_syment *sym = &rawsyms[i].u.syment;

      switch (sym->n_sclass)

        {

        case C_FILE:

          {

            /* new source file announced */

            struct coff_sfile *n =

              (struct coff_sfile *) xmalloc (sizeof (struct coff_sfile));

            n->section = (struct coff_isection *) xcalloc (sizeof (struct coff_isection), abfd->section_count + 1);

            cur_sfile = n;

            n->name = sym->_n._n_nptr[1];

            n->next = 0;

            if (infile)

              {

                pop_scope ();

              }

            infile = 1;

            push_scope (1);

            file_scope = n->scope = top_scope;

            if (head->source_tail)

              head->source_tail->next = n;

            else

              head->source_head = n;

            head->source_tail = n;

            head->nsources++;

            i += sym->n_numaux + 1;

          }

          break;

        case C_FCN:

          {

            char *name = sym->_n._n_nptr[1];