C++ hash_table::find_slot方法代码示例

static struct redirection_data *
lookup_redirection_data (edge e, enum insert_option insert)
{
  struct redirection_data **slot;
  struct redirection_data *elt;
  vec<jump_thread_edge *> *path = THREAD_PATH (e);

 /* Build a hash table element so we can see if E is already
     in the table.  */
  elt = XNEW (struct redirection_data);
  elt->path = path;
  elt->dup_block = NULL;
  elt->incoming_edges = NULL;

  slot = redirection_data.find_slot (elt, insert);

  /* This will only happen if INSERT is false and the entry is not
     in the hash table.  */
  if (slot == NULL)
    {
      free (elt);
      return NULL;
    }

  /* This will only happen if E was not in the hash table and
     INSERT is true.  */
  if (*slot == NULL)
    {
      *slot = elt;
      elt->incoming_edges = XNEW (struct el);
      elt->incoming_edges->e = e;
      elt->incoming_edges->next = NULL;
      return elt;
    }

intptr_t
lto_orig_address_get (tree t)
{
  struct tree_hash_entry ent;
  struct tree_hash_entry **slot;

  ent.key = t;
  slot = tree_htab.find_slot (&ent, NO_INSERT);
  return (slot ? (*slot)->value : 0);
}

void
lto_orig_address_remove (tree t)
{
  struct tree_hash_entry ent;
  struct tree_hash_entry **slot;

  ent.key = t;
  slot = tree_htab.find_slot (&ent, NO_INSERT);
  gcc_assert (slot);
  free (*slot);
  tree_htab.clear_slot (slot);
}

void
solaris_elf_asm_comdat_section (const char *name, unsigned int flags, tree decl)
{
  const char *signature;
  char *section;
  comdat_entry entry, **slot;

  if (TREE_CODE (decl) == IDENTIFIER_NODE)
    signature = IDENTIFIER_POINTER (decl);
  else
    signature = IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl));

  /* Sun as requires group sections to be fragmented, i.e. to have names of
     the form <section>%<fragment>.  Strictly speaking this is only
     necessary to support cc -xF, but is enforced globally in violation of
     the ELF gABI.  We keep the section names generated by GCC (generally
     of the form .text.<signature>) and append %<signature> to pacify as,
     despite the redundancy.  */
  section = concat (name, "%", signature, NULL);

  /* Clear SECTION_LINKONCE flag so targetm.asm_out.named_section only
     emits this as a regular section.  Emit section before .group
     directive since Sun as treats undeclared sections as @progbits,
     which conflicts with .bss* sections which are @nobits.  */
  targetm.asm_out.named_section (section, flags & ~SECTION_LINKONCE, decl);
  
  /* Sun as separates declaration of a group section and of the group
     itself, using the .group directive and the #comdat flag.  */
  fprintf (asm_out_file, "\t.group\t%s," SECTION_NAME_FORMAT ",#comdat\n",
	   signature, section);

  /* Unlike GNU as, group signature symbols need to be defined explicitly
     for Sun as.  With a few exceptions, this is already the case.  To
     identify the missing ones without changing the affected frontents,
     remember the signature symbols and emit those not marked
     TREE_SYMBOL_REFERENCED in solaris_file_end.  */
  if (!solaris_comdat_htab.is_created ())
    solaris_comdat_htab.create (37);

  entry.sig = signature;
  slot = solaris_comdat_htab.find_slot (&entry, INSERT);

  if (*slot == NULL)
    {
      *slot = XCNEW (comdat_entry);
      /* Remember fragmented section name.  */
      (*slot)->name = section;
      /* Emit as regular section, .group declaration has already been done.  */
      (*slot)->flags = flags & ~SECTION_LINKONCE;
      (*slot)->decl = decl;
      (*slot)->sig = signature;
    }
}

void
lto_orig_address_map (tree t, intptr_t orig_t)
{
  struct tree_hash_entry ent;
  struct tree_hash_entry **slot;

  ent.key = t;
  ent.value = orig_t;
  slot = tree_htab.find_slot (&ent, INSERT);
  gcc_assert (!*slot);
  *slot = XNEW (struct tree_hash_entry);
  **slot = ent;
}