error.c

gcc库的原代码,对编程有很大帮助.

    case TREE_VEC:
    case UNINSTANTIATED_P_TYPE:
    case UNION_TYPE:
    case UNKNOWN_TYPE:
    case VOID_TYPE:
      break;

    default:
      sorry ("`%s' not supported by dump_type_suffix",
	     tree_code_name[(int) TREE_CODE (t)]);
    }
}

/* Return a function declaration which corresponds to the IDENTIFIER_NODE
   argument.  */
tree
ident_fndecl (t)
     tree t;
{
  tree n = lookup_name (t, 0);

  if (n == NULL_TREE)
    return NULL_TREE;

  if (TREE_CODE (n) == FUNCTION_DECL)
    return n;
  else if (TREE_CODE (n) == TREE_LIST
	   && TREE_CODE (TREE_VALUE (n)) == FUNCTION_DECL)
    return TREE_VALUE (n);

  my_friendly_abort (66);
  return NULL_TREE;
}

#ifndef NO_DOLLAR_IN_LABEL
#  define GLOBAL_THING "_GLOBAL_$"
#else
#  ifndef NO_DOT_IN_LABEL
#    define GLOBAL_THING "_GLOBAL_."
#  else
#    define GLOBAL_THING "_GLOBAL__"
#  endif
#endif

#define GLOBAL_IORD_P(NODE) \
  !strncmp(IDENTIFIER_POINTER(NODE),GLOBAL_THING,sizeof(GLOBAL_THING)-1)

void
dump_global_iord (t)
     tree t;
{
  char *name = IDENTIFIER_POINTER (t);

  OB_PUTS ("(static ");
  if (name [sizeof (GLOBAL_THING) - 1] == 'I')
    OB_PUTS ("initializers");
  else if (name [sizeof (GLOBAL_THING) - 1] == 'D')
    OB_PUTS ("destructors");
  else
    my_friendly_abort (352);
  
  OB_PUTS (" for ");
  OB_PUTCP (input_filename);
  OB_PUTC (')');
}

static void
dump_decl (t, v)
     tree t;
     int v;			/* verbosity */
{
  if (t == NULL_TREE)
    return;

  switch (TREE_CODE (t))
    {
    case ERROR_MARK:
      OB_PUTS (" /* decl error */ ");
      break;

    case TYPE_DECL:
      {
	/* Don't say 'typedef class A' */
	tree type = TREE_TYPE (t);
        if (((IS_AGGR_TYPE (type) && ! TYPE_PTRMEMFUNC_P (type))
	     || TREE_CODE (type) == ENUMERAL_TYPE)
	    && type == TYPE_MAIN_VARIANT (type))
	  {
	    dump_type (type, v);
	    break;
	  }
      }
      if (v > 0)
	OB_PUTS ("typedef ");
      goto general;
      break;
      
    case VAR_DECL:
      if (DECL_NAME (t) && VTABLE_NAME_P (DECL_NAME (t)))
	{
	  OB_PUTS ("vtable for ");
	  dump_type (DECL_CONTEXT (t), v);
	  break;
	}
      /* else fall through */
    case FIELD_DECL:
    case PARM_DECL:
    general:
      if (v > 0)
	{
	  dump_type_prefix (TREE_TYPE (t), v);
	  OB_PUTC (' ');
	  dump_readonly_or_volatile (t, after);
	}
      /* DECL_CLASS_CONTEXT isn't being set in some cases.  Hmm...  */
      if (DECL_CONTEXT (t)
	  && TREE_CODE_CLASS (TREE_CODE (DECL_CONTEXT (t))) == 't')
	{
	  dump_type (DECL_CONTEXT (t), 0);
	  OB_PUTC2 (':', ':');
	}
      if (DECL_NAME (t))
	dump_decl (DECL_NAME (t), v);
      else
	OB_PUTS ("{anon}");
      if (v > 0)
	dump_type_suffix (TREE_TYPE (t), v);
      break;

    case NAMESPACE_DECL:
      OB_PUTID (DECL_NAME (t));
      break;

    case ARRAY_REF:
      dump_decl (TREE_OPERAND (t, 0), v);
      OB_PUTC ('[');
      dump_decl (TREE_OPERAND (t, 1), v);
      OB_PUTC (']');
      break;

      /* So that we can do dump_decl in dump_aggr_type and have it work for
	 both class and function scope.  */
    case RECORD_TYPE:
    case UNION_TYPE:
    case ENUMERAL_TYPE:
      dump_type (t, v);
      break;

    case TYPE_EXPR:
      my_friendly_abort (69);
      break;

      /* These special cases are duplicated here so that other functions
	 can feed identifiers to cp_error and get them demangled properly. */
    case IDENTIFIER_NODE:
      { tree f;
	if (DESTRUCTOR_NAME_P (t)
	    && (f = ident_fndecl (t))
	    && DECL_LANGUAGE (f) == lang_cplusplus)
	  {
	    OB_PUTC ('~');
	    dump_decl (DECL_NAME (f), 0);
	  }
	else if (IDENTIFIER_TYPENAME_P (t))
	  {
	    OB_PUTS ("operator ");
	    /* Not exactly IDENTIFIER_TYPE_VALUE.  */
	    dump_type (TREE_TYPE (t), 0);
	    break;
	  }
	else if (IDENTIFIER_OPNAME_P (t))
	  {
	    char *name_string = operator_name_string (t);
	    OB_PUTS ("operator ");
	    OB_PUTCP (name_string);
	  }
	else
	  OB_PUTID (t);
      }
      break;

    case FUNCTION_DECL:
      if (GLOBAL_IORD_P (DECL_ASSEMBLER_NAME (t)))
	dump_global_iord (DECL_ASSEMBLER_NAME (t));
      else
	dump_function_decl (t, v);
      break;

    case TEMPLATE_DECL:
      {
	tree args = DECL_TEMPLATE_PARMS (t);
	int i, len = args ? TREE_VEC_LENGTH (args) : 0;
	OB_PUTS ("template <");
	for (i = 0; i < len; i++)
	  {
	    tree arg = TREE_VEC_ELT (args, i);
	    tree defval = TREE_PURPOSE (arg);
	    arg = TREE_VALUE (arg);
	    if (TREE_CODE (arg) == TYPE_DECL)
	      {
		OB_PUTS ("class ");
		OB_PUTID (DECL_NAME (arg));
	      }
	    else
	      dump_decl (arg, 1);

	    if (defval)
	      {
		OB_PUTS (" = ");
		dump_decl (defval, 1);
	      }
		
	    OB_PUTC2 (',', ' ');
	  }
	if (len != 0)
	  OB_UNPUT (2);
	OB_PUTC2 ('>', ' ');

	if (DECL_TEMPLATE_IS_CLASS (t))
	  {
	    OB_PUTS ("class ");
	    OB_PUTID (DECL_NAME (t));
	  }
	else switch (NEXT_CODE (t))
	  {
	  case METHOD_TYPE:
	  case FUNCTION_TYPE:
	    dump_function_decl (t, v);
	    break;

	  default:
	    my_friendly_abort (353);
	  }
      }
      break;

    case LABEL_DECL:
      OB_PUTID (DECL_NAME (t));
      break;

    case CONST_DECL:
      if (NEXT_CODE (t) == ENUMERAL_TYPE)
	goto general;
      else
	dump_expr (DECL_INITIAL (t), 0);
      break;

    default:
      sorry ("`%s' not supported by dump_decl",
	     tree_code_name[(int) TREE_CODE (t)]);
    }
}

/* Pretty printing for announce_function.  T is the declaration of the
   function we are interested in seeing.  V is non-zero if we should print
   the type that this function returns.  */

static void
dump_function_decl (t, v)
     tree t;
     int v;
{
  tree name = DECL_ASSEMBLER_NAME (t);
  tree fntype = TREE_TYPE (t);
  tree parmtypes = TYPE_ARG_TYPES (fntype);
  tree cname = NULL_TREE;

  /* Friends have DECL_CLASS_CONTEXT set, but not DECL_CONTEXT.  */
  if (DECL_CONTEXT (t))
    cname = DECL_CLASS_CONTEXT (t);
  /* this is for partially instantiated template methods */
  else if (TREE_CODE (fntype) == METHOD_TYPE)
    cname = TREE_TYPE (TREE_VALUE (parmtypes));

  v = (v > 0);
  
  if (v)
    {
      if (DECL_STATIC_FUNCTION_P (t))
	OB_PUTS ("static ");
    
      if (! IDENTIFIER_TYPENAME_P (name)
	  && ! DECL_CONSTRUCTOR_P (t)
	  && ! DESTRUCTOR_NAME_P (name))
	{
	  dump_type_prefix (TREE_TYPE (fntype), 1);
	  OB_PUTC (' ');
	}
    }

  if (cname)
    {
      dump_type (cname, 0);
      OB_PUTC2 (':', ':');
      if (TREE_CODE (fntype) == METHOD_TYPE && parmtypes)
	parmtypes = TREE_CHAIN (parmtypes);
      if (DECL_CONSTRUCTOR_FOR_VBASE_P (t))
	/* Skip past "in_charge" identifier.  */
	parmtypes = TREE_CHAIN (parmtypes);
    }

  if (DESTRUCTOR_NAME_P (name) && DECL_LANGUAGE (t) == lang_cplusplus)
    parmtypes = TREE_CHAIN (parmtypes);
  
  dump_function_name (t);
  
  OB_PUTC ('(');

  if (parmtypes)
    dump_type (parmtypes, v);
  else
    OB_PUTS ("...");

  OB_PUTC (')');

  if (v && ! IDENTIFIER_TYPENAME_P (name))
    dump_type_suffix (TREE_TYPE (fntype), 1);

  if (TREE_CODE (fntype) == METHOD_TYPE)
    {
      if (IS_SIGNATURE (cname))
	/* We look at the type pointed to by the `optr' field of `this.'  */
	dump_readonly_or_volatile
	  (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_VALUE (TYPE_ARG_TYPES (fntype))))), before);
      else
	dump_readonly_or_volatile
	  (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fntype))), before);
    }
}

/* Handle the function name for a FUNCTION_DECL node, grokking operators
   and destructors properly.  */
static void
dump_function_name (t)
     tree t;
{
  tree name = DECL_NAME (t);

  /* There ought to be a better way to find out whether or not something is
     a destructor.  */
  if (DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (t))
      && DECL_LANGUAGE (t) == lang_cplusplus)
    {
      OB_PUTC ('~');
      dump_decl (name, 0);
    }
  else if (IDENTIFIER_TYPENAME_P (name))
    {
      /* This cannot use the hack that the operator's return
	 type is stashed off of its name because it may be
	 used for error reporting.  In the case of conflicting
	 declarations, both will have the same name, yet
	 the types will be different, hence the TREE_TYPE field
	 of the first name will be clobbered by the second.  */
      OB_PUTS ("operator ");
      dump_type (TREE_TYPE (TREE_TYPE (t)), 0);
    }
  else if (IDENTIFIER_OPNAME_P (name))
    {
      char *name_string = operator_name_string (name);
      OB_PUTS ("operator ");
      OB_PUTCP (name_string);
    }
  else
    dump_decl (name, 0);
}

static void
dump_char (c)
     char c;
{
  switch (c)
    {
    case TARGET_NEWLINE:
      OB_PUTS ("\\n");
      break;
    case TARGET_TAB:
      OB_PUTS ("\\t");
      break;
    case TARGET_VT:
      OB_PUTS ("\\v");
      break;
    case TARGET_BS:
      OB_PUTS ("\\b");
      break;
    case TARGET_CR:
      OB_PUTS ("\\r");
      break;
    case TARGET_FF:
      OB_PUTS ("\\f");
      break;
    case TARGET_BELL:
      OB_PUTS ("\\a");
      break;
    case '\\':
      OB_PUTS ("\\\\");
      break;
    case '\'':
      OB_PUTS ("\\'");
      break;
    case '\"':
      OB_PUTS ("\\\"");
      break;
    default:
      if (isprint (c))
	OB_PUTC (c);
      else
	{
	  sprintf (digit_buffer, "\\%03o", (int) c);
	  OB_PUTCP (digit_buffer);
	}
    }
}

/* Print out a list of initializers (subr of dump_expr) */
static void
dump_expr_list (l)
     tree l;
{
  while (l)
    {
      dump_expr (TREE_VALUE (l), 0);
      if (TREE_CHAIN (l))
	OB_PUTC2 (',', ' ');
      l = TREE_CHAIN (l);
    }
}

/* Print out an expression */
static void
dump_expr (t, nop)
     tree t;
     int nop;			/* suppress parens */
{
  switch (TREE_CODE (t))
    {
    case VAR_DECL:
    case PARM_DECL:
    case FIELD_DECL:
    case CONST_DECL:
    case FUNCTION_DECL:
      dump_decl (t, -1);
      break;

    case INTEGER_CST:
      {
	tree type = TREE_TYPE (t);
	my_friendly_assert (type != 0, 81);

	/* If it's an enum, output its tag, rather than its value.  */
	if (TREE_CODE (type) == ENUMERAL_TYPE)
	  {
	    char *p = enum_name_string (t, type);
	    OB_PUTCP (p);
	  }
	else if (type == boolean_type_node)
	  {
	    if (t == boolean_false_node)
	      OB_PUTS ("false");
	    else if (t == boolean_true_node)
	      OB_PUTS ("true");
	    else
	      my_friendly_abort (366);
	  }
	else if (type == char_type_node)
	  {
	    OB_PUTC ('\'');
	    dump_char (TREE_INT_CST_LOW (t));
	    OB_PUTC ('\'');
	  }
	else if (TREE_INT_CST_HIGH (t)
		 != (TREE_INT_CST_LOW (t) >> (HOST_BITS_PER_WIDE_INT - 1)))
	  {
	    tree val = t;
	    if (TREE_INT_CST_HIGH (val) < 0)
	      {
		OB_PUTC ('-');
		val = build_int_2 (~TREE_INT_CST_LOW (val),
				   -TREE_INT_CST_HIGH (val));
	      }
	    /* Would "%x%0*x" or "%x%*0x" get zero-padding on all
	       systems?  */
	    {
	      static char format[10]; /* "%x%09999x\0" */
	      if (!format[0])
		sprintf (format, "%%x%%0%dx", HOST_BITS_PER_INT / 4);
	      sprintf (digit_buffer, format, TREE_INT_CST_HIGH (val),
		       TREE_INT_CST_LOW (val));
	      OB_PUTCP (digit_buffer);
	    }
	  }
	else
	  OB_PUTI (TREE_INT_CST_LOW (t));
      }
      break;