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

/* coffgrok.c
   Copyright 1994, 1995, 1997, 1998, 2000 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 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

/* Written by Steve Chamberlain ([e-mail])

   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 <bfd.h>
#include "bucomm.h"

#include "coff/internal.h"
#include "../bfd/libcoff.h"
#include "coffgrok.h"
int lofile = 1;
static struct coff_scope *top_scope;
static struct coff_scope *file_scope;
static struct coff_ofile *ofile;

struct coff_symbol *last_function_symbol;
struct coff_type *last_function_type;
struct coff_type *last_struct;
struct coff_type *last_enum;
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;
extern char *xcalloc ();
#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 ()
{
  struct coff_scope *l;
  l = (struct coff_scope *) (xcalloc (sizeof (struct coff_scope), 1));
  return l;
}

static struct coff_symbol *
empty_symbol ()
{
  return (struct coff_symbol *) (xcalloc (sizeof (struct coff_symbol), 1));
}

/*int l;*/
static void
push_scope (link)
     int link;
{
  struct coff_scope *n = empty_scope ();
  if (link)
    {
      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 ()
{
  top_scope = top_scope->parent;
}

static void
do_sections_p1 (head)
     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 = section->_raw_size;
      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 (head)
     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 (i)
     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 (i, name)
     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 (i)
     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)
	    {
	      /* Refering 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;