coffgrok.c

来自「基于4个mips核的noc设计」· C语言 代码 · 共 738 行 · 第 1/2 页

	    }
	  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 anonynmous */
	  res->type = coff_structref_type;
	  res->u.astructref.ref = 0;
	  res->size = 0;
	}
      break;
    case T_ENUM:
      if (aux->x_sym.x_tagndx.p)
	{
	  /* Refering 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 (i)
     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 (i, b)
     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 ()
{
  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];
	    if (name[1] == 'b')
	      {
		/* Function start */
		push_scope (0);
		last_function_type->u.function.code = top_scope;
		top_scope->sec = ofile->sections + sym->n_scnum;
		top_scope->offset = sym->n_value;
	      }
	    else
	      {
		top_scope->size = sym->n_value - top_scope->offset + 1;
		pop_scope ();

	      }
	    i += sym->n_numaux + 1;
	  }
	  break;

	case C_BLOCK:
	  {
	    char *name = sym->_n._n_nptr[1];
	    if (name[1] == 'b')
	      {
		/* Block start */
		push_scope (1);
		top_scope->sec = ofile->sections + sym->n_scnum;
		top_scope->offset = sym->n_value;

	      }
	    else
	      {
		top_scope->size = sym->n_value - top_scope->offset + 1;
		pop_scope ();
	      }
	    i += sym->n_numaux + 1;
	  }
	  break;
	case C_REGPARM:
	case C_ARG:
	  i = do_define (i, last_function_symbol->type->u.function.parameters);
	  break;
	case C_MOS:
	case C_MOU:
	case C_FIELD:
	  i = do_define (i, last_struct->u.astructdef.elements);
	  break;
	case C_MOE:
	  i = do_define (i, last_enum->u.aenumdef.elements);
	  break;
	case C_STRTAG:
	case C_ENTAG:
	case C_UNTAG:
	  /* Various definition */
	  i = do_define (i, top_scope);
	  break;
	case C_EXT:
	case C_LABEL:
	  i = do_define (i, file_scope);
	  break;
	case C_STAT:
	case C_TPDEF:
	case C_AUTO:
	case C_REG:
	  i = do_define (i, top_scope);
	  break;
	default:
	  abort ();
	case C_EOS:
	  i += sym->n_numaux + 1;
	  break;
	}
    }
  do_sections_p2 (head);
  return head;
}

struct coff_ofile *
coff_grok (inabfd)
     bfd *inabfd;
{
  long storage;
  struct coff_ofile *p;
  abfd = inabfd;
  storage = bfd_get_symtab_upper_bound (abfd);

  if (storage < 0)
    bfd_fatal (abfd->filename);

  syms = (asymbol **) xmalloc (storage);
  symcount = bfd_canonicalize_symtab (abfd, syms);
  if (symcount < 0)
    bfd_fatal (abfd->filename);
  rawsyms = obj_raw_syments (abfd);
  rawcount = obj_raw_syment_count (abfd);;
  tindex = (struct coff_symbol **) (xcalloc (sizeof (struct coff_symbol *), rawcount));

  p = doit ();
  return p;
}