edsel.c

gcc库的原代码,对编程有很大帮助.

void
cadillac_finish_enum (type)
     tree type;
{
  Connection *conn = cadillacObj.conn;
  tree name = TYPE_NAME (type);

  if (TREE_CODE (name) == TYPE_DECL)
    name = DECL_NAME (name);

  if (context_stack)
    switch (TREE_CODE (context_stack->context))
      {
      case FUNCTION_DECL:
	return;
      case RECORD_TYPE:
      case UNION_TYPE:
	CWriteHeader (conn, EndDefMType, 0);
	CWriteLength (conn);
	break;
      default:
	my_friendly_abort (30);
      }
  else
    {
      CWriteHeader (conn, EndDefMType, 0);
      CWriteLength (conn);
      cadillac_printf ("finish top-level enum", IDENTIFIER_POINTER (name));
      CWriteTopLevel (conn, StopMType);
    }

  CWriteRequestBuffer (conn);
  cadillac_process_requests (conn);
}

void
cadillac_start_struct (type)
     tree type;
{
  Connection *conn = cadillacObj.conn;
  tree name = TYPE_NAME (type);

  if (TREE_CODE (name) == TYPE_DECL)
    name = DECL_NAME (name);

  if (context_stack)
    switch (TREE_CODE (context_stack->context))
      {
      case FUNCTION_DECL:
	return;
      case RECORD_TYPE:
      case UNION_TYPE:
	return;
      default:
	my_friendly_abort (31);
      }
  else
    {
      cadillac_printf ("start struct", IDENTIFIER_POINTER (name));
      CWriteTopLevel (conn, StartMType);
    }

  context_stack = push_context_level (context_stack, &cadillac_obstack);
  context_stack->context = type;

  CWriteLanguageType (conn, type,
		      TYPE_LANG_SPECIFIC (type) && CLASSTYPE_DECLARED_CLASS (type) ? ClassOType : tree_to_cadillac_map[TREE_CODE (type)]);
}

void
cadillac_finish_struct (type)
     tree type;
{
  Connection *conn = cadillacObj.conn;
  tree name = TYPE_NAME (type);

  if (TREE_CODE (name) == TYPE_DECL)
    name = DECL_NAME (name);

  context_stack = pop_context_level (context_stack);
  if (context_stack)
    return;

  cadillac_printf ("finish struct", IDENTIFIER_POINTER (name));
  CWriteHeader (conn, EndDefMType, 0);
  CWriteLength (conn);
  CWriteTopLevel (conn, StopMType);
  CWriteRequestBuffer (conn);
  cadillac_process_requests (conn);
}

void
cadillac_finish_exception (type)
     tree type;
{
  Connection *conn = cadillacObj.conn;

  fatal ("cadillac_finish_exception");
  CWriteHeader (conn, EndDefMType, 0);
  CWriteLength (conn);
  CWriteTopLevel (conn, StopMType);
  CWriteRequestBuffer (conn);
  cadillac_process_requests (conn);
}

void
cadillac_push_class (type)
     tree type;
{
}

void
cadillac_pop_class ()
{
}

void
cadillac_push_lang (name)
     tree name;
{
  Connection *conn = cadillacObj.conn;
  CLinkLanguageType m;

  if (name == lang_name_cplusplus)
    m = LinkCPlus;
  else if (name == lang_name_c)
    m = LinkC;
  else
    my_friendly_abort (32);
  CWriteHeader (conn, ForeignLinkageMType, m);
  CWriteRequestBuffer (conn);
  cadillac_process_requests (conn);
}

void
cadillac_pop_lang ()
{
  Connection *conn = cadillacObj.conn;

  CWriteHeader (conn, ForeignLinkageMType, LinkPop);
  CWriteRequestBuffer (conn);
  cadillac_process_requests (conn);
}

void
cadillac_finish_stmt ()
{
}

void
cadillac_note_source ()
{
  cadillacObj.lineno = lineno;
  cadillacObj.filename = input_filename;
}

static void
CWriteTopLevel (conn, m)
     Connection *conn;
     CMessageSubType m;
{
  static context_id = 0;
  CWriteHeader (conn, TopLevelFormMType, m);
  cadillac_note_filepos ();

  /* Eventually, this will point somewhere into the digest file.  */
  context_id += 1;
  CWriteSomething (conn, &context_id, sizeof (BITS32));

  CWriteSomething (conn, &cadillacObj.iflevel, sizeof (BITS32));
  CWriteLength (conn);
}

static void
cadillac_note_filepos ()
{
  extern FILE *finput;
  int pos = ftell (finput);
  CWriteSomething (cadillacObj.conn, &pos, sizeof (BITS32));
}

void
cadillac_switch_source (startflag)
     int startflag;
{
  Connection *conn = cadillacObj.conn;
  /* Send out the name of the source file being compiled.  */

  CWriteHeader (conn, SourceFileMType, startflag ? StartMType : StopMType);
  CWriteSomething (conn, &cadillacObj.depth, sizeof (BITS16));
  CWriteVstring0 (conn, input_filename);
  CWriteLength (conn);
  CWriteRequestBuffer (conn);
  cadillac_process_requests (conn);
}

void
cadillac_push_source ()
{
  cadillacObj.depth += 1;
  cadillac_switch_source (1);
}

void
cadillac_pop_source ()
{
  cadillacObj.depth -= 1;
  cadillac_switch_source (0);
}

struct cadillac_mdep
{
  short object_type;
  char linkage;
  char access;
  short length;
};

static void
CWriteLanguageElem (conn, p, name)
     Connection *conn;
     struct cadillac_mdep *p;
     char *name;
{
  CWriteSomething (conn, &p->object_type, sizeof (BITS16));
  CWriteSomething (conn, &p->linkage, sizeof (BITS8));
  CWriteSomething (conn, &p->access, sizeof (BITS8));
  CWriteSomething (conn, &p->length, sizeof (BITS16));
  CWriteVstring0 (conn, name);

#if 0
  /* Don't write date_type.  */
  CWriteVstring0 (conn, "");
#endif
  CWriteLength (conn);
}

static void
CWriteLanguageDecl (conn, decl, object_type)
     Connection *conn;
     tree decl;
     CObjectType object_type;
{
  struct cadillac_mdep foo;
  tree name;

  CWriteHeader (conn, LanguageElementMType, StartDefineMType);
  foo.object_type = object_type;
  if (decl_type_context (decl))
    {
      foo.linkage = ParentLinkage;
      if (TREE_PRIVATE (decl))
	foo.access = PrivateAccess;
      else if (TREE_PROTECTED (decl))
	foo.access = ProtectedAccess;
      else
	foo.access = PublicAccess;
    }
  else
    {
      if (TREE_PUBLIC (decl))
	foo.linkage = GlobalLinkage;
      else
	foo.linkage = FileLinkage;
      foo.access = PublicAccess;
    }
  name = DECL_NAME (decl);
  foo.length = IDENTIFIER_LENGTH (name);

  CWriteLanguageElem (conn, &foo, IDENTIFIER_POINTER (name));
  CWriteRequestBuffer (conn);
  cadillac_process_requests (conn);
}

static void
CWriteLanguageType (conn, type, object_type)
     Connection *conn;
     tree type;
     CObjectType object_type;
{
  struct cadillac_mdep foo;
  tree name = TYPE_NAME (type);

  CWriteHeader (conn, LanguageElementMType, StartDefineMType);
  foo.object_type = object_type;
  if (current_class_type)
    {
      foo.linkage = ParentLinkage;
      if (TREE_PRIVATE (type))
	foo.access = PrivateAccess;
      else if (TREE_PROTECTED (type))
	foo.access = ProtectedAccess;
      else
	foo.access = PublicAccess;
    }
  else
    {
      foo.linkage = NoLinkage;
      foo.access = PublicAccess;
    }
  if (TREE_CODE (name) == TYPE_DECL)
    name = DECL_NAME (name);

  foo.length = IDENTIFIER_LENGTH (name);

  CWriteLanguageElem (conn, &foo, IDENTIFIER_POINTER (name));
  CWriteRequestBuffer (conn);
  cadillac_process_requests (conn);
}

static void
CWriteUseObject (conn, type, object_type, use)
     Connection *conn;
     tree type;
     CObjectType object_type;
     CMessageSubType use;
{
  struct cadillac_mdep foo;
  tree name = NULL_TREE;

  CWriteHeader (conn, LanguageElementMType, use);
  foo.object_type = object_type;
  if (current_class_type)
    {
      foo.linkage = ParentLinkage;
      if (TREE_PRIVATE (type))
	foo.access = PrivateAccess;
      else if (TREE_PROTECTED (type))
	foo.access = ProtectedAccess;
      else
	foo.access = PublicAccess;
    }
  else
    {
      foo.linkage = NoLinkage;
      foo.access = PublicAccess;
    }
  switch (TREE_CODE (type))
    {
    case VAR_DECL:
    case FIELD_DECL:
    case TYPE_DECL:
    case CONST_DECL:
    case FUNCTION_DECL:
      name = DECL_NAME (type);
      break;

    default:
      my_friendly_abort (33);
  }

  foo.length = IDENTIFIER_LENGTH (name);

  CWriteLanguageElem (conn, &foo, IDENTIFIER_POINTER (name));
  CWriteRequestBuffer (conn);
  cadillac_process_requests (conn);
}

/* Here's how we exit under cadillac.  */

static void
exit_cadillac ()
{
  extern int errorcount;

  Connection *conn = cadillacObj.conn;

  if (flag_cadillac)
    {
      CCompilerMessage *req;

      CWriteHeader (conn, FinishedMType,
		    errorcount ? 0 : CsObjectWritten | CsComplete);
      /* Bye, bye!  */
      CWriteRequestBuffer (conn);

      /* Block on read.  */
      while (! readable_p (cadillacObj.fd_input))
	{
	  if (exiting)
	    my_friendly_abort (34);
	  exiting = 1;
	}
      exiting = 1;

      req = CReadCompilerMessage (conn);
      cadillac_process_request (&cadillacObj, req);
    }
}

#else
/* Stubs.  */
void init_cadillac () {}
void cadillac_start () {}
void cadillac_start_decl (decl)
     tree decl;
{}
void
cadillac_finish_decl (decl)
     tree decl;
{}
void
cadillac_start_function (fndecl)
     tree fndecl;
{}
void
cadillac_finish_function (fndecl)
     tree fndecl;
{}
void
cadillac_finish_anon_union (decl)
     tree decl;
{}
void
cadillac_start_enum (type)
     tree type;
{}
void
cadillac_finish_enum (type)
     tree type;
{}
void
cadillac_start_struct (type)
     tree type;
{}
void
cadillac_finish_struct (type)
     tree type;
{}
void
cadillac_finish_exception (type)
     tree type;
{}
void
cadillac_push_class (type)
     tree type;
{}
void
cadillac_pop_class ()
{}
void
cadillac_push_lang (name)
     tree name;
{}
void
cadillac_pop_lang ()
{}
void
cadillac_note_source ()
{}
void
cadillac_finish_stmt ()
{}
void
cadillac_switch_source ()
{}
void
cadillac_push_source ()
{}
void
cadillac_pop_source ()
{}
#endif