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/* Darwin support for GDB, the GNU debugger.

   Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.

   Contributed by AdaCore.

   This file is part of GDB.

   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 "defs.h"

#include "symtab.h"

#include "gdbtypes.h"

#include "bfd.h"

#include "symfile.h"

#include "objfiles.h"

#include "buildsym.h"

#include "gdbcmd.h"

#include "gdbcore.h"

#include "mach-o.h"

#include "gdb_assert.h"

#include "aout/stab_gnu.h"

#include "vec.h"

#include <string.h>

/* If non-zero displays debugging message.  */

static int mach_o_debug_level = 0;

/* Dwarf debugging information are never in the final executable.  They stay

   in object files and the executable contains the list of object files read

   during the link.

   Each time an oso (other source) is found in the executable, the reader

   creates such a structure.  They are read after the processing of the

   executable.

*/

typedef struct oso_el

{

  /* Object file name.  */

  const char *name;

  /* Associated time stamp.  */

  unsigned long mtime;

  /* Number of sections.  This is the length of SYMBOLS and OFFSETS array.  */

  int num_sections;

  /* Each seaction of the object file is represented by a symbol and its

     offset.  If the offset is 0, we assume that the symbol is at offset 0

     in the OSO object file and a symbol lookup in the main file is

     required to get the offset.  */

  asymbol **symbols;

  bfd_vma *offsets;

}

oso_el;

/* Vector of object files to be read after the executable.  This is one

   global variable but it's life-time is the one of macho_symfile_read.  */

DEF_VEC_O (oso_el);

static VEC (oso_el) *oso_vector;

struct macho_oso_data

{

  /* Per objfile symbol table.  This is used to apply relocation to sections

     It is loaded only once, then relocated, and free after sections are

     relocated.  */

  asymbol **symbol_table;

  /* The offsets for this objfile.  Used to relocate the symbol_table.  */

  struct oso_el *oso;

  struct objfile *main_objfile;

};

/* Data for OSO being processed.  */

static struct macho_oso_data current_oso;

static void

macho_new_init (struct objfile *objfile)

{

}

static void

macho_symfile_init (struct objfile *objfile)

{

  objfile->flags |= OBJF_REORDERED;

  init_entry_point_info (objfile);

}

/*  Add a new OSO to the vector of OSO to load.  */

static void

macho_register_oso (const asymbol *oso_sym, int nbr_sections,

                    asymbol **symbols, bfd_vma *offsets)

{

  oso_el el;

  el.name = oso_sym->name;

  el.mtime = oso_sym->value;

  el.num_sections = nbr_sections;

  el.symbols = symbols;

  el.offsets = offsets;

  VEC_safe_push (oso_el, oso_vector, &el);

}

/* Build the minimal symbol table from SYMBOL_TABLE of length

   NUMBER_OF_SYMBOLS for OBJFILE.

   Read OSO files at the end.  */

static void

macho_symtab_read (struct objfile *objfile,

                   long number_of_symbols, asymbol **symbol_table)

{

  struct gdbarch *gdbarch = get_objfile_arch (objfile);

  long storage_needed;

  long i, j;

  CORE_ADDR offset;

  enum minimal_symbol_type ms_type;

  unsigned int nbr_sections = bfd_count_sections (objfile->obfd);

  asymbol **first_symbol = NULL;

  bfd_vma *first_offset = NULL;

  const asymbol *oso_file = NULL;

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

    {

      asymbol *sym = symbol_table[i];

      bfd_mach_o_asymbol *mach_o_sym = (bfd_mach_o_asymbol *)sym;

      offset = ANOFFSET (objfile->section_offsets, sym->section->index);

      if (sym->flags & BSF_DEBUGGING)

        {

          bfd_vma addr;

          /* Debugging symbols are used to collect OSO file names as well

             as section offsets.  */

          switch (mach_o_sym->n_type)

            {

            case N_SO:

              /* An empty SO entry terminates a chunk for an OSO file.  */

              if ((sym->name == NULL || sym->name[0] == 0) && oso_file != NULL)

                {

                  macho_register_oso (oso_file, nbr_sections,

                                      first_symbol, first_offset);

                  first_symbol = NULL;

                  first_offset = NULL;

                  oso_file = NULL;

                }

              break;

            case N_FUN:

            case N_STSYM:

              if (sym->name == NULL || sym->name[0] == '\0')

                break;

              /* Fall through.  */

            case N_BNSYM:

              gdb_assert (oso_file != NULL);

              addr = sym->value

                + bfd_get_section_vma (sym->section->bfd, sym->section);

              if (addr != 0

                  && first_symbol[sym->section->index] == NULL)

                {

                  /* These STAB entries can directly relocate a section.  */

                  first_symbol[sym->section->index] = sym;

                  first_offset[sym->section->index] = addr + offset;

                }

              break;

            case N_GSYM:

              gdb_assert (oso_file != NULL);

              if (first_symbol[sym->section->index] == NULL)

                {

                  /* This STAB entry needs a symbol look-up to relocate

                     the section.  */

                  first_symbol[sym->section->index] = sym;

                  first_offset[sym->section->index] = 0;

                }

              break;

            case N_OSO:

              /* New OSO file.  */

              gdb_assert (oso_file == NULL);

              first_symbol = (asymbol **)xmalloc (nbr_sections

                                                  * sizeof (asymbol *));

              first_offset = (bfd_vma *)xmalloc (nbr_sections

                                                 * sizeof (bfd_vma));

              for (j = 0; j < nbr_sections; j++)

                first_symbol[j] = NULL;

              oso_file = sym;

              break;

            }

          continue;

        }

      if (sym->name == NULL || *sym->name == '\0')

        {

          /* Skip names that don't exist (shouldn't happen), or names

             that are null strings (may happen). */

          continue;

        }

      if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK))

        {

          struct minimal_symbol *msym;

          CORE_ADDR symaddr;

          /* Bfd symbols are section relative. */

          symaddr = sym->value + sym->section->vma;

          /* Select global/local/weak symbols.  Note that bfd puts abs

             symbols in their own section, so all symbols we are

             interested in will have a section. */

          /* Relocate all non-absolute and non-TLS symbols by the

             section offset.  */

          if (sym->section != &bfd_abs_section

              && !(sym->section->flags & SEC_THREAD_LOCAL))

            symaddr += offset;

          if (sym->section == &bfd_abs_section)

            ms_type = mst_abs;

          else if (sym->section->flags & SEC_CODE)

            {

              if (sym->flags & (BSF_GLOBAL | BSF_WEAK))

                ms_type = mst_text;

              else

                ms_type = mst_file_text;

            }

          else if (sym->section->flags & SEC_ALLOC)

            {

              if (sym->flags & (BSF_GLOBAL | BSF_WEAK))

                {

                  if (sym->section->flags & SEC_LOAD)

                    ms_type = mst_data;

                  else

                    ms_type = mst_bss;

                }

              else if (sym->flags & BSF_LOCAL)

                {

                  /* Not a special stabs-in-elf symbol, do regular

                     symbol processing.  */

                  if (sym->section->flags & SEC_LOAD)

                    ms_type = mst_file_data;

                  else

                    ms_type = mst_file_bss;

                }

              else

                ms_type = mst_unknown;

            }

          else

            continue;   /* Skip this symbol. */

          gdb_assert (sym->section->index < nbr_sections);

          if (oso_file != NULL

              && first_symbol[sym->section->index] == NULL)

            {

              /* Standard symbols can directly relocate sections.  */

              first_symbol[sym->section->index] = sym;

              first_offset[sym->section->index] = symaddr;

            }

          msym = prim_record_minimal_symbol_and_info

            (sym->name, symaddr, ms_type, sym->section->index,

             sym->section, objfile);

        }

    }

  /* Just in case there is no trailing SO entry.  */

  if (oso_file != NULL)

    macho_register_oso (oso_file, nbr_sections, first_symbol, first_offset);

}

/* If NAME describes an archive member (ie: ARCHIVE '(' MEMBER ')'),

   returns the length of the archive name.

   Returns -1 otherwise.  */

static int

get_archive_prefix_len (const char *name)

{

  char *lparen;

  int name_len = strlen (name);

  if (name_len == 0 || name[name_len - 1] != ')')

    return -1;

  lparen = strrchr (name, '(');

  if (lparen == NULL || lparen == name)

    return -1;

  return lparen - name;

}

static int

oso_el_compare_name (const void *vl, const void *vr)

{

  const oso_el *l = (const oso_el *)vl;

  const oso_el *r = (const oso_el *)vr;

  return strcmp (l->name, r->name);

}

/* Add an oso file as a symbol file.  */

static void

macho_add_oso_symfile (oso_el *oso, bfd *abfd,

                       struct objfile *main_objfile, int symfile_flags)

{

  struct objfile *objfile;

  int i;

  char leading_char;

  if (mach_o_debug_level > 0)

    printf_unfiltered (_("Loading symbols from oso: %s\n"), oso->name);

  if (!bfd_check_format (abfd, bfd_object))

    {

      warning (_("`%s': can't read symbols: %s."), oso->name,

               bfd_errmsg (bfd_get_error ()));

      bfd_close (abfd);

      return;

    }

  bfd_set_cacheable (abfd, 1);

  /* Relocate sections.  */

  leading_char = bfd_get_symbol_leading_char (main_objfile->obfd);

  for (i = 0; i < oso->num_sections; i++)

    {

      asection *sect;

      const char *sectname;

      bfd_vma vma;

      /* Empty slot.  */

      if (oso->symbols[i] == NULL)

        continue;

      if (oso->offsets[i])

        vma = oso->offsets[i];

      else

        {

          struct minimal_symbol *msym;

          const char *name = oso->symbols[i]->name;

          if (name[0] == leading_char)

            ++name;

          if (mach_o_debug_level > 3)

            printf_unfiltered (_("resolve sect %s with %s\n"),

                               oso->symbols[i]->section->name,

                               oso->symbols[i]->name);

          msym = lookup_minimal_symbol (name, NULL, main_objfile);

          if (msym == NULL)

            {

              warning (_("can't find symbol '%s' in minsymtab"), name);

              continue;

            }

          else

            vma = SYMBOL_VALUE_ADDRESS (msym);

        }

      sectname = (char *)oso->symbols[i]->section->name;

      sect = bfd_get_section_by_name (abfd, sectname);

      if (sect == NULL)

        {

          warning (_("can't find section '%s' in OSO file %s"),

                   sectname, oso->name);

          continue;

        }

      bfd_set_section_vma (abfd, sect, vma);

      if (mach_o_debug_level > 1)

        printf_unfiltered (_("  %s: %s\n"),

                           core_addr_to_string (vma), sectname);

    }

  /* Make sure that the filename was malloc'ed.  The current filename comes

     either from an OSO symbol name or from an archive name.  Memory for both

     is not managed by gdb.  */

  abfd->filename = xstrdup (abfd->filename);

  gdb_assert (current_oso.symbol_table == NULL);

  current_oso.main_objfile = main_objfile;

  /* We need to clear SYMFILE_MAINLINE to avoid interractive question

     from symfile.c:symbol_file_add_with_addrs_or_offsets.  */

  objfile = symbol_file_add_from_bfd

    (abfd, symfile_flags & ~(SYMFILE_MAINLINE | SYMFILE_VERBOSE), NULL,

     main_objfile->flags & (OBJF_REORDERED | OBJF_SHARED

                            | OBJF_READNOW | OBJF_USERLOADED));

  add_separate_debug_objfile (objfile, main_objfile);

  current_oso.main_objfile = NULL;

  if (current_oso.symbol_table)

    {

      xfree (current_oso.symbol_table);

      current_oso.symbol_table = NULL;

    }

}

/* Read symbols from the vector of oso files.  */

static void

macho_symfile_read_all_oso (struct objfile *main_objfile, int symfile_flags)

{

  int ix;

  VEC (oso_el) *vec;

  oso_el *oso;

  vec = oso_vector;

  oso_vector = NULL;

  /* Sort oso by name so that files from libraries are gathered.  */

  qsort (VEC_address (oso_el, vec), VEC_length (oso_el, vec),

         sizeof (oso_el), oso_el_compare_name);

  for (ix = 0; VEC_iterate (oso_el, vec, ix, oso);)

    {

      int pfx_len;

      /* Check if this is a library name.  */

      pfx_len = get_archive_prefix_len (oso->name);

      if (pfx_len > 0)

        {

          bfd *archive_bfd;

          bfd *member_bfd;

          char *archive_name = XNEWVEC (char, pfx_len + 1);

          int last_ix;

          oso_el *oso2;

          int ix2;

          memcpy (archive_name, oso->name, pfx_len);

          archive_name[pfx_len] = '\0';

          /* Compute number of oso for this archive.  */

          for (last_ix = ix;

               VEC_iterate (oso_el, vec, last_ix, oso2); last_ix++)

            {

              if (strncmp (oso2->name, archive_name, pfx_len) != 0)

                break;

            }

          /* Open the archive and check the format.  */

          archive_bfd = bfd_openr (archive_name, gnutarget);

          if (archive_bfd == NULL)

            {

              warning (_("Could not open OSO archive file \"%s\""),

                       archive_name);

              ix = last_ix;

              continue;

            }

          if (!bfd_check_format (archive_bfd, bfd_archive))

            {

              warning (_("OSO archive file \"%s\" not an archive."),

                       archive_name);

              bfd_close (archive_bfd);

              ix = last_ix;

              continue;

            }

          member_bfd = bfd_openr_next_archived_file (archive_bfd, NULL);

          if (member_bfd == NULL)

            {

              warning (_("Could not read archive members out of "

                         "OSO archive \"%s\""), archive_name);

              bfd_close (archive_bfd);

              ix = last_ix;

              continue;

            }

          /* Load all oso in this library.  */

          while (member_bfd != NULL)

            {

              bfd *prev;

              const char *member_name = member_bfd->filename;

              int member_len = strlen (member_name);

              /* If this member is referenced, add it as a symfile.  */

              for (ix2 = ix; ix2 < last_ix; ix2++)

                {

                  oso2 = VEC_index (oso_el, vec, ix2);

                  if (oso2->name

                      && strlen (oso2->name) == pfx_len + member_len + 2

                      && !memcmp (member_name, oso2->name + pfx_len + 1,

                                  member_len))

                    {

                      macho_add_oso_symfile (oso2, member_bfd,

                                             main_objfile, symfile_flags);

                      oso2->name = NULL;

                      break;

                    }

                }

              prev = member_bfd;

              member_bfd = bfd_openr_next_archived_file

                (archive_bfd, member_bfd);

              /* Free previous member if not referenced by an oso.  */

              if (ix2 >= last_ix)

                bfd_close (prev);

            }

          for (ix2 = ix; ix2 < last_ix; ix2++)

            {

              oso_el *oso2 = VEC_index (oso_el, vec, ix2);

              if (oso2->name != NULL)

                warning (_("Could not find specified archive member "

                           "for OSO name \"%s\""), oso->name);

            }

          ix = last_ix;

        }

      else

        {

          bfd *abfd;

          abfd = bfd_openr (oso->name, gnutarget);

          if (!abfd)

            warning (_("`%s': can't open to read symbols: %s."), oso->name,

                     bfd_errmsg (bfd_get_error ()));

          else

            macho_add_oso_symfile (oso, abfd, main_objfile, symfile_flags);

          ix++;

        }

    }

  for (ix = 0; VEC_iterate (oso_el, vec, ix, oso); ix++)

    {

      xfree (oso->symbols);

      xfree (oso->offsets);

    }

  VEC_free (oso_el, vec);

}

/* DSYM (debug symbols) files contain the debug info of an executable.

   This is a separate file created by dsymutil(1) and is similar to debug

   link feature on ELF.

   DSYM files are located in a subdirectory.  Append DSYM_SUFFIX to the

   executable name and the executable base name to get the DSYM file name.  */

#define DSYM_SUFFIX ".dSYM/Contents/Resources/DWARF/"

/* Check if a dsym file exists for OBJFILE.  If so, returns a bfd for it.

   Return NULL if no valid dsym file is found.  */

static bfd *

macho_check_dsym (struct objfile *objfile)

{

  size_t name_len = strlen (objfile->name);

  size_t dsym_len = strlen (DSYM_SUFFIX);

  const char *base_name = lbasename (objfile->name);

  size_t base_len = strlen (base_name);

  char *dsym_filename = alloca (name_len + dsym_len + base_len + 1);

  bfd *dsym_bfd;

  bfd_mach_o_load_command *main_uuid;

  bfd_mach_o_load_command *dsym_uuid;

  strcpy (dsym_filename, objfile->name);

  strcpy (dsym_filename + name_len, DSYM_SUFFIX);

  strcpy (dsym_filename + name_len + dsym_len, base_name);

  if (access (dsym_filename, R_OK) != 0)

    return NULL;

  if (bfd_mach_o_lookup_command (objfile->obfd,

                                 BFD_MACH_O_LC_UUID, &main_uuid) == 0)

    {

      warning (_("can't find UUID in %s"), objfile->name);

      return NULL;

    }

  dsym_filename = xstrdup (dsym_filename);

  dsym_bfd = bfd_openr (dsym_filename, gnutarget);

  if (dsym_bfd == NULL)

    {

      warning (_("can't open dsym file %s"), dsym_filename);

      xfree (dsym_filename);

      return NULL;

    }

  if (!bfd_check_format (dsym_bfd, bfd_object))

    {

      bfd_close (dsym_bfd);

      warning (_("bad dsym file format: %s"), bfd_errmsg (bfd_get_error ()));

      xfree (dsym_filename);

      return NULL;

    }

  if (bfd_mach_o_lookup_command (dsym_bfd,

                                 BFD_MACH_O_LC_UUID, &dsym_uuid) == 0)

    {

      warning (_("can't find UUID in %s"), dsym_filename);

      bfd_close (dsym_bfd);

      xfree (dsym_filename);

      return NULL;

    }

  if (memcmp (dsym_uuid->command.uuid.uuid, main_uuid->command.uuid.uuid,

              sizeof (main_uuid->command.uuid.uuid)))

    {

      warning (_("dsym file UUID doesn't match the one in %s"), objfile->name);

      bfd_close (dsym_bfd);

      xfree (dsym_filename);

      return NULL;

    }

  return dsym_bfd;

}

static void

macho_symfile_read (struct objfile *objfile, int symfile_flags)

{

  bfd *abfd = objfile->obfd;

  struct cleanup *back_to;

  CORE_ADDR offset;

  long storage_needed;

  bfd *dsym_bfd;

  init_minimal_symbol_collection ();

  back_to = make_cleanup_discard_minimal_symbols ();

  /* Get symbols from the symbol table only if the file is an executable.

     The symbol table of object files is not relocated and is expected to

     be in the executable.  */

  if (bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC))

    {

      /* Process the normal symbol table first.  */

      storage_needed = bfd_get_symtab_upper_bound (objfile->obfd);

      if (storage_needed < 0)

        error (_("Can't read symbols from %s: %s"),

               bfd_get_filename (objfile->obfd),

               bfd_errmsg (bfd_get_error ()));

      if (storage_needed > 0)

        {

          asymbol **symbol_table;

          long symcount;

          symbol_table = (asymbol **) xmalloc (storage_needed);

          make_cleanup (xfree, symbol_table);

          symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table);

          if (symcount < 0)

            error (_("Can't read symbols from %s: %s"),

                   bfd_get_filename (objfile->obfd),

                   bfd_errmsg (bfd_get_error ()));

          macho_symtab_read (objfile, symcount, symbol_table);

        }

      install_minimal_symbols (objfile);

      /* Try to read .eh_frame / .debug_frame.  */

      /* First, locate these sections.  We ignore the result status

         as it only checks for debug info.  */

      dwarf2_has_info (objfile);

      dwarf2_build_frame_info (objfile);

      /* Check for DSYM file.  */

      dsym_bfd = macho_check_dsym (objfile);

      if (dsym_bfd != NULL)

        {

          int ix;

          oso_el *oso;

          struct bfd_section *asect, *dsect;

          if (mach_o_debug_level > 0)

            printf_unfiltered (_("dsym file found\n"));

          /* Remove oso.  They won't be used.  */

          for (ix = 0; VEC_iterate (oso_el, oso_vector, ix, oso); ix++)

            {

              xfree (oso->symbols);

              xfree (oso->offsets);