c-decl.c (define_label): Call warning_with_file_and_line and error_with_file_and_line...

[gcc.git] / gcc / c-parse.in

/* YACC parser for C syntax and for Objective C.  -*-c-*-
   Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996,
   1997, 1998, 1999, 2000 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC 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, or (at your option)
any later version.

GNU CC 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 GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* This file defines the grammar of C and that of Objective C.
   ifobjc ... end ifobjc  conditionals contain code for Objective C only.
   ifc ... end ifc  conditionals contain code for C only.
   Sed commands in Makefile.in are used to convert this file into
   c-parse.y and into objc-parse.y.  */

/* To whomever it may concern: I have heard that such a thing was once
   written by AT&T, but I have never seen it.  */

ifobjc
%expect 74
end ifobjc
ifc
%expect 53
end ifc

%{
#include "config.h"
#include "system.h"
#include <setjmp.h>
#include "tree.h"
#include "input.h"
#include "c-lex.h"
#include "c-tree.h"
#include "flags.h"
#include "output.h"
#include "toplev.h"
#include "ggc.h"
  
#ifdef MULTIBYTE_CHARS
#include <locale.h>
#endif

ifobjc
#include "objc-act.h"
end ifobjc

/* Since parsers are distinct for each language, put the language string
   definition here.  */
ifobjc
const char * const language_string = "GNU Objective-C";
end ifobjc
ifc
const char * const language_string = "GNU C";
end ifc

/* Like YYERROR but do call yyerror.  */
#define YYERROR1 { yyerror ("syntax error"); YYERROR; }

/* Cause the `yydebug' variable to be defined.  */
#define YYDEBUG 1
%}

%start program

%union {long itype; tree ttype; enum tree_code code;
        const char *filename; int lineno; int ends_in_label; }

/* All identifiers that are not reserved words
   and are not declared typedefs in the current block */
%token IDENTIFIER

/* All identifiers that are declared typedefs in the current block.
   In some contexts, they are treated just like IDENTIFIER,
   but they can also serve as typespecs in declarations.  */
%token TYPENAME

/* Reserved words that specify storage class.
   yylval contains an IDENTIFIER_NODE which indicates which one.  */
%token SCSPEC

/* Reserved words that specify type.
   yylval contains an IDENTIFIER_NODE which indicates which one.  */
%token TYPESPEC

/* Reserved words that qualify type: "const", "volatile", or "restrict".
   yylval contains an IDENTIFIER_NODE which indicates which one.  */
%token TYPE_QUAL

/* Character or numeric constants.
   yylval is the node for the constant.  */
%token CONSTANT

/* String constants in raw form.
   yylval is a STRING_CST node.  */
%token STRING

/* "...", used for functions with variable arglists.  */
%token ELLIPSIS

/* the reserved words */
/* SCO include files test "ASM", so use something else. */
%token SIZEOF ENUM STRUCT UNION IF ELSE WHILE DO FOR SWITCH CASE DEFAULT
%token BREAK CONTINUE RETURN GOTO ASM_KEYWORD TYPEOF ALIGNOF
%token ATTRIBUTE EXTENSION LABEL
%token REALPART IMAGPART VA_ARG
%token PTR_VALUE PTR_BASE PTR_EXTENT

/* Used in c-lex.c for parsing pragmas.  */
%token END_OF_LINE

/* Add precedence rules to solve dangling else s/r conflict */
%nonassoc IF
%nonassoc ELSE

/* Define the operator tokens and their precedences.
   The value is an integer because, if used, it is the tree code
   to use in the expression made from the operator.  */

%right <code> ASSIGN '='
%right <code> '?' ':'
%left <code> OROR
%left <code> ANDAND
%left <code> '|'
%left <code> '^'
%left <code> '&'
%left <code> EQCOMPARE
%left <code> ARITHCOMPARE
%left <code> LSHIFT RSHIFT
%left <code> '+' '-'
%left <code> '*' '/' '%'
%right <code> UNARY PLUSPLUS MINUSMINUS
%left HYPERUNARY
%left <code> POINTSAT '.' '(' '['

/* The Objective-C keywords.  These are included in C and in
   Objective C, so that the token codes are the same in both.  */
%token INTERFACE IMPLEMENTATION END SELECTOR DEFS ENCODE
%token CLASSNAME PUBLIC PRIVATE PROTECTED PROTOCOL OBJECTNAME CLASS ALIAS

/* Objective-C string constants in raw form.
   yylval is an STRING_CST node.  */
%token OBJC_STRING


%type <code> unop

%type <ttype> identifier IDENTIFIER TYPENAME CONSTANT expr nonnull_exprlist exprlist
%type <ttype> expr_no_commas cast_expr unary_expr primary string STRING
%type <ttype> typed_declspecs reserved_declspecs
%type <ttype> typed_typespecs reserved_typespecquals
%type <ttype> declmods typespec typespecqual_reserved
%type <ttype> typed_declspecs_no_prefix_attr reserved_declspecs_no_prefix_attr
%type <ttype> declmods_no_prefix_attr
%type <ttype> SCSPEC TYPESPEC TYPE_QUAL nonempty_type_quals maybe_type_qual
%type <ttype> initdecls notype_initdecls initdcl notype_initdcl
%type <ttype> init maybeasm
%type <ttype> asm_operands nonnull_asm_operands asm_operand asm_clobbers
%type <ttype> maybe_attribute attributes attribute attribute_list attrib
%type <ttype> any_word extension

%type <ttype> compstmt compstmt_nostart compstmt_primary_start

%type <ttype> declarator
%type <ttype> notype_declarator after_type_declarator
%type <ttype> parm_declarator

%type <ttype> structsp component_decl_list component_decl_list2
%type <ttype> component_decl components component_declarator
%type <ttype> enumlist enumerator
%type <ttype> struct_head union_head enum_head
%type <ttype> typename absdcl absdcl1 type_quals
%type <ttype> xexpr parms parm identifiers

%type <ttype> parmlist parmlist_1 parmlist_2
%type <ttype> parmlist_or_identifiers parmlist_or_identifiers_1
%type <ttype> identifiers_or_typenames

%type <itype> setspecs

%type <ends_in_label> lineno_stmt_or_label lineno_stmt_or_labels stmt_or_label

%type <filename> save_filename
%type <lineno> save_lineno
\f
ifobjc
/* the Objective-C nonterminals */

%type <ttype> ivar_decl_list ivar_decls ivar_decl ivars ivar_declarator
%type <ttype> methoddecl unaryselector keywordselector selector
%type <ttype> keyworddecl receiver objcmessageexpr messageargs
%type <ttype> keywordexpr keywordarglist keywordarg
%type <ttype> myparms myparm optparmlist reservedwords objcselectorexpr
%type <ttype> selectorarg keywordnamelist keywordname objcencodeexpr
%type <ttype> objc_string non_empty_protocolrefs protocolrefs identifier_list objcprotocolexpr

%type <ttype> CLASSNAME OBJC_STRING OBJECTNAME
end ifobjc
\f
%{
/* Number of statements (loosely speaking) and compound statements 
   seen so far.  */
static int stmt_count;
static int compstmt_count;
  
/* Input file and line number of the end of the body of last simple_if;
   used by the stmt-rule immediately after simple_if returns.  */
static const char *if_stmt_file;
static int if_stmt_line;

/* List of types and structure classes of the current declaration.  */
static tree current_declspecs = NULL_TREE;
static tree prefix_attributes = NULL_TREE;

/* Stack of saved values of current_declspecs and prefix_attributes.  */
static tree declspec_stack;

/* For __extension__, save/restore the warning flags which are
   controlled by __extension__.  */
#define SAVE_WARN_FLAGS()       \
        size_int (pedantic | (warn_pointer_arith << 1))
#define RESTORE_WARN_FLAGS(tval) \
  do {                                     \
    int val = tree_low_cst (tval, 0);      \
    pedantic = val & 1;                    \
    warn_pointer_arith = (val >> 1) & 1;   \
  } while (0)

ifobjc
/* Objective-C specific information */

tree objc_interface_context;
tree objc_implementation_context;
tree objc_method_context;
tree objc_ivar_chain;
tree objc_ivar_context;
enum tree_code objc_inherit_code;
int objc_receiver_context;
int objc_public_flag;

end ifobjc

/* Tell yyparse how to print a token's value, if yydebug is set.  */

#define YYPRINT(FILE,YYCHAR,YYLVAL) yyprint(FILE,YYCHAR,YYLVAL)
extern void yyprint                     PARAMS ((FILE *, int, YYSTYPE));

/* Add GC roots for variables local to this file.  */
void
c_parse_init ()
{
  ggc_add_tree_root (&declspec_stack, 1);
  ggc_add_tree_root (&current_declspecs, 1);
  ggc_add_tree_root (&prefix_attributes, 1);
ifobjc
  ggc_add_tree_root (&objc_interface_context, 1);
  ggc_add_tree_root (&objc_implementation_context, 1);
  ggc_add_tree_root (&objc_method_context, 1);
  ggc_add_tree_root (&objc_ivar_chain, 1);
  ggc_add_tree_root (&objc_ivar_context, 1);
end ifobjc
}

%}
\f
%%
program: /* empty */
                { if (pedantic)
                    pedwarn ("ISO C forbids an empty source file");
                  finish_file ();
                }
        | extdefs
                {
                  /* In case there were missing closebraces,
                     get us back to the global binding level.  */
                  while (! global_bindings_p ())
                    poplevel (0, 0, 0);
                  finish_file ();
                }
        ;

/* the reason for the strange actions in this rule
 is so that notype_initdecls when reached via datadef
 can find a valid list of type and sc specs in $0. */

extdefs:
        {$<ttype>$ = NULL_TREE; } extdef
        | extdefs {$<ttype>$ = NULL_TREE; ggc_collect(); } extdef
        ;

extdef:
        fndef
        | datadef
ifobjc
        | objcdef
end ifobjc
        | ASM_KEYWORD '(' expr ')' ';'
                { STRIP_NOPS ($3);
                  if ((TREE_CODE ($3) == ADDR_EXPR
                       && TREE_CODE (TREE_OPERAND ($3, 0)) == STRING_CST)
                      || TREE_CODE ($3) == STRING_CST)
                    assemble_asm ($3);
                  else
                    error ("argument of `asm' is not a constant string"); }
        | extension extdef
                { RESTORE_WARN_FLAGS ($1); }
        ;

datadef:
          setspecs notype_initdecls ';'
                { if (pedantic)
                    error ("ISO C forbids data definition with no type or storage class");
                  else if (!flag_traditional)
                    warning ("data definition has no type or storage class"); 

                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | declmods setspecs notype_initdecls ';'
                { current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | typed_declspecs setspecs initdecls ';'
                { current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | declmods ';'
          { pedwarn ("empty declaration"); }
        | typed_declspecs ';'
          { shadow_tag ($1); }
        | error ';'
        | error '}'
        | ';'
                { if (pedantic)
                    pedwarn ("ISO C does not allow extra `;' outside of a function"); }
        ;
\f
fndef:
          typed_declspecs setspecs declarator
                { if (! start_function (current_declspecs, $3,
                                        prefix_attributes, NULL_TREE))
                    YYERROR1;
                  reinit_parse_for_function (); }
          old_style_parm_decls
                { store_parm_decls (); }
          compstmt_or_error
                { finish_function (0); 
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | typed_declspecs setspecs declarator error
                { current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | declmods setspecs notype_declarator
                { if (! start_function (current_declspecs, $3,
                                        prefix_attributes, NULL_TREE))
                    YYERROR1;
                  reinit_parse_for_function (); }
          old_style_parm_decls
                { store_parm_decls (); }
          compstmt_or_error
                { finish_function (0); 
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | declmods setspecs notype_declarator error
                { current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | setspecs notype_declarator
                { if (! start_function (NULL_TREE, $2,
                                        prefix_attributes, NULL_TREE))
                    YYERROR1;
                  reinit_parse_for_function (); }
          old_style_parm_decls
                { store_parm_decls (); }
          compstmt_or_error
                { finish_function (0); 
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | setspecs notype_declarator error
                { current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        ;

identifier:
        IDENTIFIER
        | TYPENAME
ifobjc
        | OBJECTNAME
        | CLASSNAME
end ifobjc
        ;

unop:     '&'
                { $$ = ADDR_EXPR; }
        | '-'
                { $$ = NEGATE_EXPR; }
        | '+'
                { $$ = CONVERT_EXPR;
ifc
  if (warn_traditional && !in_system_header)
    warning ("traditional C rejects the unary plus operator");
end ifc
                }
        | PLUSPLUS
                { $$ = PREINCREMENT_EXPR; }
        | MINUSMINUS
                { $$ = PREDECREMENT_EXPR; }
        | '~'
                { $$ = BIT_NOT_EXPR; }
        | '!'
                { $$ = TRUTH_NOT_EXPR; }
        ;

expr:   nonnull_exprlist
                { $$ = build_compound_expr ($1); }
        ;

exprlist:
          /* empty */
                { $$ = NULL_TREE; }
        | nonnull_exprlist
        ;

nonnull_exprlist:
        expr_no_commas
                { $$ = build_tree_list (NULL_TREE, $1); }
        | nonnull_exprlist ',' expr_no_commas
                { chainon ($1, build_tree_list (NULL_TREE, $3)); }
        ;

unary_expr:
        primary
        | '*' cast_expr   %prec UNARY
                { $$ = build_indirect_ref ($2, "unary *"); }
        /* __extension__ turns off -pedantic for following primary.  */
        | extension cast_expr     %prec UNARY
                { $$ = $2;
                  RESTORE_WARN_FLAGS ($1); }
        | unop cast_expr  %prec UNARY
                { $$ = build_unary_op ($1, $2, 0);
                  overflow_warning ($$); }
        /* Refer to the address of a label as a pointer.  */
        | ANDAND identifier
                { tree label = lookup_label ($2);
                  if (pedantic)
                    pedwarn ("ISO C forbids `&&'");
                  if (label == 0)
                    $$ = null_pointer_node;
                  else
                    {
                      TREE_USED (label) = 1;
                      $$ = build1 (ADDR_EXPR, ptr_type_node, label);
                      TREE_CONSTANT ($$) = 1;
                    }
                }
/* This seems to be impossible on some machines, so let's turn it off.
   You can use __builtin_next_arg to find the anonymous stack args.
        | '&' ELLIPSIS
                { tree types = TYPE_ARG_TYPES (TREE_TYPE (current_function_decl));
                  $$ = error_mark_node;
                  if (TREE_VALUE (tree_last (types)) == void_type_node)
                    error ("`&...' used in function with fixed number of arguments");
                  else
                    {
                      if (pedantic)
                        pedwarn ("ISO C forbids `&...'");
                      $$ = tree_last (DECL_ARGUMENTS (current_function_decl));
                      $$ = build_unary_op (ADDR_EXPR, $$, 0);
                    } }
*/
        | sizeof unary_expr  %prec UNARY
                { skip_evaluation--;
                  if (TREE_CODE ($2) == COMPONENT_REF
                      && DECL_C_BIT_FIELD (TREE_OPERAND ($2, 1)))
                    error ("`sizeof' applied to a bit-field");
                  $$ = c_sizeof (TREE_TYPE ($2)); }
        | sizeof '(' typename ')'  %prec HYPERUNARY
                { skip_evaluation--;
                  $$ = c_sizeof (groktypename ($3)); }
        | alignof unary_expr  %prec UNARY
                { skip_evaluation--;
                  $$ = c_alignof_expr ($2); }
        | alignof '(' typename ')'  %prec HYPERUNARY
                { skip_evaluation--;
                  $$ = c_alignof (groktypename ($3)); }
        | REALPART cast_expr %prec UNARY
                { $$ = build_unary_op (REALPART_EXPR, $2, 0); }
        | IMAGPART cast_expr %prec UNARY
                { $$ = build_unary_op (IMAGPART_EXPR, $2, 0); }
        | VA_ARG '(' expr_no_commas ',' typename ')'
                { $$ = build_va_arg ($3, groktypename ($5)); }
        ;

sizeof:
        SIZEOF { skip_evaluation++; }
        ;

alignof:
        ALIGNOF { skip_evaluation++; }
        ;

cast_expr:
        unary_expr
        | '(' typename ')' cast_expr  %prec UNARY
                { tree type;
                  int SAVED_warn_strict_prototypes = warn_strict_prototypes;
                  /* This avoids warnings about unprototyped casts on
                     integers.  E.g. "#define SIG_DFL (void(*)())0".  */
                  if (TREE_CODE ($4) == INTEGER_CST)
                    warn_strict_prototypes = 0;
                  type = groktypename ($2);
                  warn_strict_prototypes = SAVED_warn_strict_prototypes;
                  $$ = build_c_cast (type, $4); }
        | '(' typename ')' '{' 
                { start_init (NULL_TREE, NULL, 0);
                  $2 = groktypename ($2);
                  really_start_incremental_init ($2); }
          initlist_maybe_comma '}'  %prec UNARY
                { const char *name;
                  tree result = pop_init_level (0);
                  tree type = $2;
                  finish_init ();

                  if (pedantic && ! flag_isoc99)
                    pedwarn ("ISO C89 forbids constructor expressions");
                  if (TYPE_NAME (type) != 0)
                    {
                      if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
                        name = IDENTIFIER_POINTER (TYPE_NAME (type));
                      else
                        name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
                    }
                  else
                    name = "";
                  $$ = result;
                  if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
                    {
                      int failure = complete_array_type (type, $$, 1);
                      if (failure)
                        abort ();
                    }
                }
        ;

expr_no_commas:
          cast_expr
        | expr_no_commas '+' expr_no_commas
                { $$ = parser_build_binary_op ($2, $1, $3); }
        | expr_no_commas '-' expr_no_commas
                { $$ = parser_build_binary_op ($2, $1, $3); }
        | expr_no_commas '*' expr_no_commas
                { $$ = parser_build_binary_op ($2, $1, $3); }
        | expr_no_commas '/' expr_no_commas
                { $$ = parser_build_binary_op ($2, $1, $3); }
        | expr_no_commas '%' expr_no_commas
                { $$ = parser_build_binary_op ($2, $1, $3); }
        | expr_no_commas LSHIFT expr_no_commas
                { $$ = parser_build_binary_op ($2, $1, $3); }
        | expr_no_commas RSHIFT expr_no_commas
                { $$ = parser_build_binary_op ($2, $1, $3); }
        | expr_no_commas ARITHCOMPARE expr_no_commas
                { $$ = parser_build_binary_op ($2, $1, $3); }
        | expr_no_commas EQCOMPARE expr_no_commas
                { $$ = parser_build_binary_op ($2, $1, $3); }
        | expr_no_commas '&' expr_no_commas
                { $$ = parser_build_binary_op ($2, $1, $3); }
        | expr_no_commas '|' expr_no_commas
                { $$ = parser_build_binary_op ($2, $1, $3); }
        | expr_no_commas '^' expr_no_commas
                { $$ = parser_build_binary_op ($2, $1, $3); }
        | expr_no_commas ANDAND
                { $1 = truthvalue_conversion (default_conversion ($1));
                  skip_evaluation += $1 == boolean_false_node; }
          expr_no_commas
                { skip_evaluation -= $1 == boolean_false_node;
                  $$ = parser_build_binary_op (TRUTH_ANDIF_EXPR, $1, $4); }
        | expr_no_commas OROR
                { $1 = truthvalue_conversion (default_conversion ($1));
                  skip_evaluation += $1 == boolean_true_node; }
          expr_no_commas
                { skip_evaluation -= $1 == boolean_true_node;
                  $$ = parser_build_binary_op (TRUTH_ORIF_EXPR, $1, $4); }
        | expr_no_commas '?'
                { $1 = truthvalue_conversion (default_conversion ($1));
                  skip_evaluation += $1 == boolean_false_node; }
          expr ':'
                { skip_evaluation += (($1 == boolean_true_node)
                                      - ($1 == boolean_false_node)); }
          expr_no_commas
                { skip_evaluation -= $1 == boolean_true_node;
                  $$ = build_conditional_expr ($1, $4, $7); }
        | expr_no_commas '?'
                { if (pedantic)
                    pedwarn ("ISO C forbids omitting the middle term of a ?: expression");
                  /* Make sure first operand is calculated only once.  */
                  $<ttype>2 = save_expr ($1);
                  $1 = truthvalue_conversion (default_conversion ($<ttype>2));
                  skip_evaluation += $1 == boolean_true_node; }
          ':' expr_no_commas
                { skip_evaluation -= $1 == boolean_true_node;
                  $$ = build_conditional_expr ($1, $<ttype>2, $5); }
        | expr_no_commas '=' expr_no_commas
                { char class;
                  $$ = build_modify_expr ($1, NOP_EXPR, $3);
                  class = TREE_CODE_CLASS (TREE_CODE ($$));
                  if (class == 'e' || class == '1'
                      || class == '2' || class == '<')
                    C_SET_EXP_ORIGINAL_CODE ($$, MODIFY_EXPR);
                }
        | expr_no_commas ASSIGN expr_no_commas
                { char class;
                  $$ = build_modify_expr ($1, $2, $3);
                  /* This inhibits warnings in truthvalue_conversion.  */
                  class = TREE_CODE_CLASS (TREE_CODE ($$));
                  if (class == 'e' || class == '1'
                      || class == '2' || class == '<')
                    C_SET_EXP_ORIGINAL_CODE ($$, ERROR_MARK);
                }
        ;

primary:
        IDENTIFIER
                {
                  if (yychar == YYEMPTY)
                    yychar = YYLEX;
                  $$ = build_external_ref ($1, yychar == '(');
                }
        | CONSTANT
        | string
                { $$ = combine_strings ($1); }
        | '(' expr ')'
                { char class = TREE_CODE_CLASS (TREE_CODE ($2));
                  if (class == 'e' || class == '1'
                      || class == '2' || class == '<')
                    C_SET_EXP_ORIGINAL_CODE ($2, ERROR_MARK);
                  $$ = $2; }
        | '(' error ')'
                { $$ = error_mark_node; }
        | compstmt_primary_start compstmt_nostart ')'
                { tree rtl_exp;
                  if (pedantic)
                    pedwarn ("ISO C forbids braced-groups within expressions");
                  pop_label_level ();
                  rtl_exp = expand_end_stmt_expr ($1);
                  /* The statements have side effects, so the group does.  */
                  TREE_SIDE_EFFECTS (rtl_exp) = 1;

                  if (TREE_CODE ($2) == BLOCK)
                    {
                      /* Make a BIND_EXPR for the BLOCK already made.  */
                      $$ = build (BIND_EXPR, TREE_TYPE (rtl_exp),
                                  NULL_TREE, rtl_exp, $2);
                      /* Remove the block from the tree at this point.
                         It gets put back at the proper place
                         when the BIND_EXPR is expanded.  */
                      delete_block ($2);
                    }
                  else
                    $$ = $2;
                }
        | compstmt_primary_start error ')'
                {
                  /* Make sure we call expand_end_stmt_expr.  Otherwise
                     we are likely to lose sequences and crash later.  */
                  pop_label_level ();
                  expand_end_stmt_expr ($1);
                  $$ = error_mark_node;
                }
        | primary '(' exprlist ')'   %prec '.'
                { $$ = build_function_call ($1, $3); }
        | primary '[' expr ']'   %prec '.'
                { $$ = build_array_ref ($1, $3); }
        | primary '.' identifier
                {
ifobjc
                  if (doing_objc_thang)
                    {
                      if (is_public ($1, $3))
                        $$ = build_component_ref ($1, $3);
                      else
                        $$ = error_mark_node;
                    }
                  else
end ifobjc
                    $$ = build_component_ref ($1, $3);
                }
        | primary POINTSAT identifier
                {
                  tree expr = build_indirect_ref ($1, "->");

ifobjc
                  if (doing_objc_thang)
                    {
                      if (is_public (expr, $3))
                        $$ = build_component_ref (expr, $3);
                      else
                        $$ = error_mark_node;
                    }
                  else
end ifobjc
                    $$ = build_component_ref (expr, $3);
                }
        | primary PLUSPLUS
                { $$ = build_unary_op (POSTINCREMENT_EXPR, $1, 0); }
        | primary MINUSMINUS
                { $$ = build_unary_op (POSTDECREMENT_EXPR, $1, 0); }
ifobjc
        | objcmessageexpr
                { $$ = build_message_expr ($1); }
        | objcselectorexpr
                { $$ = build_selector_expr ($1); }
        | objcprotocolexpr
                { $$ = build_protocol_expr ($1); }
        | objcencodeexpr
                { $$ = build_encode_expr ($1); }
        | objc_string
                { $$ = build_objc_string_object ($1); }
end ifobjc
        ;

/* Produces a STRING_CST with perhaps more STRING_CSTs chained onto it.  */
string:
          STRING
        | string STRING
                {
ifc
                  static int last_lineno = 0;
                  static const char *last_input_filename = 0;
end ifc
                  $$ = chainon ($1, $2);
ifc
                  if (warn_traditional && !in_system_header
                      && (lineno != last_lineno || !last_input_filename ||
                          strcmp (last_input_filename, input_filename)))
                    {
                      warning ("traditional C rejects string concatenation");
                      last_lineno = lineno;
                      last_input_filename = input_filename;
                    }
end ifc
                }
        ;

ifobjc
/* Produces an STRING_CST with perhaps more STRING_CSTs chained
   onto it, which is to be read as an ObjC string object.  */
objc_string:
          OBJC_STRING
        | objc_string OBJC_STRING
                { $$ = chainon ($1, $2); }
        ;
end ifobjc

old_style_parm_decls:
        /* empty */
        | datadecls
        | datadecls ELLIPSIS
                /* ... is used here to indicate a varargs function.  */
                { c_mark_varargs ();
                  if (pedantic)
                    pedwarn ("ISO C does not permit use of `varargs.h'"); }
        ;

/* The following are analogous to lineno_decl, decls and decl
   except that they do not allow nested functions.
   They are used for old-style parm decls.  */
lineno_datadecl:
          save_filename save_lineno datadecl
                { }
        ;

datadecls:
        lineno_datadecl
        | errstmt
        | datadecls lineno_datadecl
        | lineno_datadecl errstmt
        ;

/* We don't allow prefix attributes here because they cause reduce/reduce
   conflicts: we can't know whether we're parsing a function decl with
   attribute suffix, or function defn with attribute prefix on first old
   style parm.  */
datadecl:
        typed_declspecs_no_prefix_attr setspecs initdecls ';'
                { current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | declmods_no_prefix_attr setspecs notype_initdecls ';'
                { current_declspecs = TREE_VALUE (declspec_stack);      
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | typed_declspecs_no_prefix_attr ';'
                { shadow_tag_warned ($1, 1);
                  pedwarn ("empty declaration"); }
        | declmods_no_prefix_attr ';'
                { pedwarn ("empty declaration"); }
        ;

/* This combination which saves a lineno before a decl
   is the normal thing to use, rather than decl itself.
   This is to avoid shift/reduce conflicts in contexts
   where statement labels are allowed.  */
lineno_decl:
          save_filename save_lineno decl
                { }
        ;

decls:
        lineno_decl
        | errstmt
        | decls lineno_decl
        | lineno_decl errstmt
        ;

/* records the type and storage class specs to use for processing
   the declarators that follow.
   Maintains a stack of outer-level values of current_declspecs,
   for the sake of parm declarations nested in function declarators.  */
setspecs: /* empty */
                { pending_xref_error ();
                  declspec_stack = tree_cons (prefix_attributes,
                                              current_declspecs,
                                              declspec_stack);
                  split_specs_attrs ($<ttype>0,
                                     &current_declspecs, &prefix_attributes); }
        ;

/* ??? Yuck.  See after_type_declarator.  */
setattrs: /* empty */
                { prefix_attributes = chainon (prefix_attributes, $<ttype>0); }
        ;

decl:
        typed_declspecs setspecs initdecls ';'
                { current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | declmods setspecs notype_initdecls ';'
                { current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | typed_declspecs setspecs nested_function
                { current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | declmods setspecs notype_nested_function
                { current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | typed_declspecs ';'
                { shadow_tag ($1); }
        | declmods ';'
                { pedwarn ("empty declaration"); }
        | extension decl
                { RESTORE_WARN_FLAGS ($1); }
        ;

/* Declspecs which contain at least one type specifier or typedef name.
   (Just `const' or `volatile' is not enough.)
   A typedef'd name following these is taken as a name to be declared.
   Declspecs have a non-NULL TREE_VALUE, attributes do not.  */

typed_declspecs:
          typespec reserved_declspecs
                { $$ = tree_cons (NULL_TREE, $1, $2); }
        | declmods typespec reserved_declspecs
                { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
        ;

reserved_declspecs:  /* empty */
                { $$ = NULL_TREE; }
        | reserved_declspecs typespecqual_reserved
                { $$ = tree_cons (NULL_TREE, $2, $1); }
        | reserved_declspecs SCSPEC
                { if (extra_warnings)
                    warning ("`%s' is not at beginning of declaration",
                             IDENTIFIER_POINTER ($2));
                  $$ = tree_cons (NULL_TREE, $2, $1); }
        | reserved_declspecs attributes
                { $$ = tree_cons ($2, NULL_TREE, $1); }
        ;

typed_declspecs_no_prefix_attr:
          typespec reserved_declspecs_no_prefix_attr
                { $$ = tree_cons (NULL_TREE, $1, $2); }
        | declmods_no_prefix_attr typespec reserved_declspecs_no_prefix_attr
                { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
        ;

reserved_declspecs_no_prefix_attr:
          /* empty */
                { $$ = NULL_TREE; }
        | reserved_declspecs_no_prefix_attr typespecqual_reserved
                { $$ = tree_cons (NULL_TREE, $2, $1); }
        | reserved_declspecs_no_prefix_attr SCSPEC
                { if (extra_warnings)
                    warning ("`%s' is not at beginning of declaration",
                             IDENTIFIER_POINTER ($2));
                  $$ = tree_cons (NULL_TREE, $2, $1); }
        ;

/* List of just storage classes, type modifiers, and prefix attributes.
   A declaration can start with just this, but then it cannot be used
   to redeclare a typedef-name.
   Declspecs have a non-NULL TREE_VALUE, attributes do not.  */

declmods:
          declmods_no_prefix_attr
                { $$ = $1; }
        | attributes
                { $$ = tree_cons ($1, NULL_TREE, NULL_TREE); }
        | declmods declmods_no_prefix_attr
                { $$ = chainon ($2, $1); }
        | declmods attributes
                { $$ = tree_cons ($2, NULL_TREE, $1); }
        ;

declmods_no_prefix_attr:
          TYPE_QUAL
                { $$ = tree_cons (NULL_TREE, $1, NULL_TREE);
                  TREE_STATIC ($$) = 1; }
        | SCSPEC
                { $$ = tree_cons (NULL_TREE, $1, NULL_TREE); }
        | declmods_no_prefix_attr TYPE_QUAL
                { $$ = tree_cons (NULL_TREE, $2, $1);
                  TREE_STATIC ($$) = 1; }
        | declmods_no_prefix_attr SCSPEC
                { if (extra_warnings && TREE_STATIC ($1))
                    warning ("`%s' is not at beginning of declaration",
                             IDENTIFIER_POINTER ($2));
                  $$ = tree_cons (NULL_TREE, $2, $1);
                  TREE_STATIC ($$) = TREE_STATIC ($1); }
        ;


/* Used instead of declspecs where storage classes are not allowed
   (that is, for typenames and structure components).
   Don't accept a typedef-name if anything but a modifier precedes it.  */

typed_typespecs:
          typespec reserved_typespecquals
                { $$ = tree_cons (NULL_TREE, $1, $2); }
        | nonempty_type_quals typespec reserved_typespecquals
                { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
        ;

reserved_typespecquals:  /* empty */
                { $$ = NULL_TREE; }
        | reserved_typespecquals typespecqual_reserved
                { $$ = tree_cons (NULL_TREE, $2, $1); }
        ;

/* A typespec (but not a type qualifier).
   Once we have seen one of these in a declaration,
   if a typedef name appears then it is being redeclared.  */

typespec: TYPESPEC
        | structsp
        | TYPENAME
                { /* For a typedef name, record the meaning, not the name.
                     In case of `foo foo, bar;'.  */
                  $$ = lookup_name ($1); }
ifobjc
        | CLASSNAME protocolrefs
                { $$ = get_static_reference ($1, $2); }
        | OBJECTNAME protocolrefs
                { $$ = get_object_reference ($2); }

/* Make "<SomeProtocol>" equivalent to "id <SomeProtocol>"
   - nisse@lysator.liu.se */
        | non_empty_protocolrefs
                { $$ = get_object_reference ($1); }
end ifobjc
        | TYPEOF '(' expr ')'
                { $$ = TREE_TYPE ($3); }
        | TYPEOF '(' typename ')'
                { $$ = groktypename ($3); }
        ;

/* A typespec that is a reserved word, or a type qualifier.  */

typespecqual_reserved: TYPESPEC
        | TYPE_QUAL
        | structsp
        ;

initdecls:
        initdcl
        | initdecls ',' initdcl
        ;

notype_initdecls:
        notype_initdcl
        | notype_initdecls ',' initdcl
        ;

maybeasm:
          /* empty */
                { $$ = NULL_TREE; }
        | ASM_KEYWORD '(' string ')'
                { if (TREE_CHAIN ($3)) $3 = combine_strings ($3);
                  $$ = $3;
                }
        ;

initdcl:
          declarator maybeasm maybe_attribute '='
                { $<ttype>$ = start_decl ($1, current_declspecs, 1,
                                          $3, prefix_attributes);
                  start_init ($<ttype>$, $2, global_bindings_p ()); }
          init
/* Note how the declaration of the variable is in effect while its init is parsed! */
                { finish_init ();
                  finish_decl ($<ttype>5, $6, $2); }
        | declarator maybeasm maybe_attribute
                { tree d = start_decl ($1, current_declspecs, 0,
                                       $3, prefix_attributes);
                  finish_decl (d, NULL_TREE, $2); 
                }
        ;

notype_initdcl:
          notype_declarator maybeasm maybe_attribute '='
                { $<ttype>$ = start_decl ($1, current_declspecs, 1,
                                          $3, prefix_attributes);
                  start_init ($<ttype>$, $2, global_bindings_p ()); }
          init
/* Note how the declaration of the variable is in effect while its init is parsed! */
                { finish_init ();
                  decl_attributes ($<ttype>5, $3, prefix_attributes);
                  finish_decl ($<ttype>5, $6, $2); }
        | notype_declarator maybeasm maybe_attribute
                { tree d = start_decl ($1, current_declspecs, 0,
                                       $3, prefix_attributes);
                  finish_decl (d, NULL_TREE, $2); }
        ;
/* the * rules are dummies to accept the Apollo extended syntax
   so that the header files compile. */
maybe_attribute:
      /* empty */
                { $$ = NULL_TREE; }
        | attributes
                { $$ = $1; }
        ;
 
attributes:
      attribute
                { $$ = $1; }
        | attributes attribute
                { $$ = chainon ($1, $2); }
        ;

attribute:
      ATTRIBUTE '(' '(' attribute_list ')' ')'
                { $$ = $4; }
        ;

attribute_list:
      attrib
                { $$ = $1; }
        | attribute_list ',' attrib
                { $$ = chainon ($1, $3); }
        ;
 
attrib:
    /* empty */
                { $$ = NULL_TREE; }
        | any_word
                { $$ = build_tree_list ($1, NULL_TREE); }
        | any_word '(' IDENTIFIER ')'
                { $$ = build_tree_list ($1, build_tree_list (NULL_TREE, $3)); }
        | any_word '(' IDENTIFIER ',' nonnull_exprlist ')'
                { $$ = build_tree_list ($1, tree_cons (NULL_TREE, $3, $5)); }
        | any_word '(' exprlist ')'
                { $$ = build_tree_list ($1, $3); }
        ;

/* This still leaves out most reserved keywords,
   shouldn't we include them?  */

any_word:
          identifier
        | SCSPEC
        | TYPESPEC
        | TYPE_QUAL
        ;
\f
/* Initializers.  `init' is the entry point.  */

init:
        expr_no_commas
        | '{'
                { really_start_incremental_init (NULL_TREE); }
          initlist_maybe_comma '}'
                { $$ = pop_init_level (0); }
        | error
                { $$ = error_mark_node; }
        ;

/* `initlist_maybe_comma' is the guts of an initializer in braces.  */
initlist_maybe_comma:
          /* empty */
                { if (pedantic)
                    pedwarn ("ISO C forbids empty initializer braces"); }
        | initlist1 maybecomma
        ;

initlist1:
          initelt
        | initlist1 ',' initelt
        ;

/* `initelt' is a single element of an initializer.
   It may use braces.  */
initelt:
          designator_list '=' initval
        | designator initval
        | identifier ':'
                { set_init_label ($1); }
          initval
        | initval
        ;

initval:
          '{'
                { push_init_level (0); }
          initlist_maybe_comma '}'
                { process_init_element (pop_init_level (0)); }
        | expr_no_commas
                { process_init_element ($1); }
        | error
        ;

designator_list:
          designator
        | designator_list designator
        ;

designator:
          '.' identifier
                { set_init_label ($2); }
        /* These are for labeled elements.  The syntax for an array element
           initializer conflicts with the syntax for an Objective-C message,
           so don't include these productions in the Objective-C grammar.  */
ifc
        | '[' expr_no_commas ELLIPSIS expr_no_commas ']'
                { set_init_index ($2, $4); }
        | '[' expr_no_commas ']'
                { set_init_index ($2, NULL_TREE); }
end ifc
        ;
\f
nested_function:
          declarator
                { if (pedantic)
                    pedwarn ("ISO C forbids nested functions");

                  push_function_context ();
                  if (! start_function (current_declspecs, $1,
                                        prefix_attributes, NULL_TREE))
                    {
                      pop_function_context ();
                      YYERROR1;
                    }
                  reinit_parse_for_function (); }
           old_style_parm_decls
                { store_parm_decls (); }
/* This used to use compstmt_or_error.
   That caused a bug with input `f(g) int g {}',
   where the use of YYERROR1 above caused an error
   which then was handled by compstmt_or_error.
   There followed a repeated execution of that same rule,
   which called YYERROR1 again, and so on.  */
          compstmt
                { finish_function (1);
                  pop_function_context (); }
        ;

notype_nested_function:
          notype_declarator
                { if (pedantic)
                    pedwarn ("ISO C forbids nested functions");

                  push_function_context ();
                  if (! start_function (current_declspecs, $1,
                                        prefix_attributes, NULL_TREE))
                    {
                      pop_function_context ();
                      YYERROR1;
                    }
                  reinit_parse_for_function (); }
          old_style_parm_decls
                { store_parm_decls (); }
/* This used to use compstmt_or_error.
   That caused a bug with input `f(g) int g {}',
   where the use of YYERROR1 above caused an error
   which then was handled by compstmt_or_error.
   There followed a repeated execution of that same rule,
   which called YYERROR1 again, and so on.  */
          compstmt
                { finish_function (1);
                  pop_function_context (); }
        ;

/* Any kind of declarator (thus, all declarators allowed
   after an explicit typespec).  */

declarator:
          after_type_declarator
        | notype_declarator
        ;

/* A declarator that is allowed only after an explicit typespec.  */

after_type_declarator:
          '(' after_type_declarator ')'
                { $$ = $2; }
        | after_type_declarator '(' parmlist_or_identifiers  %prec '.'
                { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
/*      | after_type_declarator '(' error ')'  %prec '.'
                { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
                  poplevel (0, 0, 0); }  */
        | after_type_declarator '[' expr ']'  %prec '.'
                { $$ = build_nt (ARRAY_REF, $1, $3); }
        | after_type_declarator '[' ']'  %prec '.'
                { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
        | '*' type_quals after_type_declarator  %prec UNARY
                { $$ = make_pointer_declarator ($2, $3); }
        /* ??? Yuck.  setattrs is a quick hack.  We can't use
           prefix_attributes because $1 only applies to this
           declarator.  We assume setspecs has already been done.
           setattrs also avoids 5 reduce/reduce conflicts (otherwise multiple
           attributes could be recognized here or in `attributes').  */
        | attributes setattrs after_type_declarator
                { $$ = $3; }
        | TYPENAME
ifobjc
        | OBJECTNAME
end ifobjc
        ;

/* Kinds of declarator that can appear in a parameter list
   in addition to notype_declarator.  This is like after_type_declarator
   but does not allow a typedef name in parentheses as an identifier
   (because it would conflict with a function with that typedef as arg).  */

parm_declarator:
          parm_declarator '(' parmlist_or_identifiers  %prec '.'
                { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
/*      | parm_declarator '(' error ')'  %prec '.'
                { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
                  poplevel (0, 0, 0); }  */
ifc
        | parm_declarator '[' '*' ']'  %prec '.'
                { $$ = build_nt (ARRAY_REF, $1, NULL_TREE);
                  if (! flag_isoc99)
                    error ("`[*]' in parameter declaration only allowed in ISO C 99");
                }
end ifc
        | parm_declarator '[' expr ']'  %prec '.'
                { $$ = build_nt (ARRAY_REF, $1, $3); }
        | parm_declarator '[' ']'  %prec '.'
                { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
        | '*' type_quals parm_declarator  %prec UNARY
                { $$ = make_pointer_declarator ($2, $3); }
        /* ??? Yuck.  setattrs is a quick hack.  We can't use
           prefix_attributes because $1 only applies to this
           declarator.  We assume setspecs has already been done.
           setattrs also avoids 5 reduce/reduce conflicts (otherwise multiple
           attributes could be recognized here or in `attributes').  */
        | attributes setattrs parm_declarator
                { $$ = $3; }
        | TYPENAME
        ;

/* A declarator allowed whether or not there has been
   an explicit typespec.  These cannot redeclare a typedef-name.  */

notype_declarator:
          notype_declarator '(' parmlist_or_identifiers  %prec '.'
                { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
/*      | notype_declarator '(' error ')'  %prec '.'
                { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
                  poplevel (0, 0, 0); }  */
        | '(' notype_declarator ')'
                { $$ = $2; }
        | '*' type_quals notype_declarator  %prec UNARY
                { $$ = make_pointer_declarator ($2, $3); }
ifc
        | notype_declarator '[' '*' ']'  %prec '.'
                { $$ = build_nt (ARRAY_REF, $1, NULL_TREE);
                  if (! flag_isoc99)
                    error ("`[*]' in parameter declaration only allowed in ISO C 99");
                }
end ifc
        | notype_declarator '[' expr ']'  %prec '.'
                { $$ = build_nt (ARRAY_REF, $1, $3); }
        | notype_declarator '[' ']'  %prec '.'
                { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
        /* ??? Yuck.  setattrs is a quick hack.  We can't use
           prefix_attributes because $1 only applies to this
           declarator.  We assume setspecs has already been done.
           setattrs also avoids 5 reduce/reduce conflicts (otherwise multiple
           attributes could be recognized here or in `attributes').  */
        | attributes setattrs notype_declarator
                { $$ = $3; }
        | IDENTIFIER
        ;

struct_head:
          STRUCT
                { $$ = NULL_TREE; }
        | STRUCT attributes
                { $$ = $2; }
        ;

union_head:
          UNION
                { $$ = NULL_TREE; }
        | UNION attributes
                { $$ = $2; }
        ;

enum_head:
          ENUM
                { $$ = NULL_TREE; }
        | ENUM attributes
                { $$ = $2; }
        ;

structsp:
          struct_head identifier '{'
                { $$ = start_struct (RECORD_TYPE, $2);
                  /* Start scope of tag before parsing components.  */
                }
          component_decl_list '}' maybe_attribute 
                { $$ = finish_struct ($<ttype>4, $5, chainon ($1, $7)); }
        | struct_head '{' component_decl_list '}' maybe_attribute
                { $$ = finish_struct (start_struct (RECORD_TYPE, NULL_TREE),
                                      $3, chainon ($1, $5));
                }
        | struct_head identifier
                { $$ = xref_tag (RECORD_TYPE, $2); }
        | union_head identifier '{'
                { $$ = start_struct (UNION_TYPE, $2); }
          component_decl_list '}' maybe_attribute
                { $$ = finish_struct ($<ttype>4, $5, chainon ($1, $7)); }
        | union_head '{' component_decl_list '}' maybe_attribute
                { $$ = finish_struct (start_struct (UNION_TYPE, NULL_TREE),
                                      $3, chainon ($1, $5));
                }
        | union_head identifier
                { $$ = xref_tag (UNION_TYPE, $2); }
        | enum_head identifier '{'
                { $$ = start_enum ($2); }
          enumlist maybecomma_warn '}' maybe_attribute
                { $$ = finish_enum ($<ttype>4, nreverse ($5),
                                    chainon ($1, $8)); }
        | enum_head '{'
                { $$ = start_enum (NULL_TREE); }
          enumlist maybecomma_warn '}' maybe_attribute
                { $$ = finish_enum ($<ttype>3, nreverse ($4),
                                    chainon ($1, $7)); }
        | enum_head identifier
                { $$ = xref_tag (ENUMERAL_TYPE, $2); }
        ;

maybecomma:
          /* empty */
        | ','
        ;

maybecomma_warn:
          /* empty */
        | ','
                { if (pedantic && ! flag_isoc99)
                    pedwarn ("comma at end of enumerator list"); }
        ;

component_decl_list:
          component_decl_list2
                { $$ = $1; }
        | component_decl_list2 component_decl
                { $$ = chainon ($1, $2);
                  pedwarn ("no semicolon at end of struct or union"); }
        ;

component_decl_list2:   /* empty */
                { $$ = NULL_TREE; }
        | component_decl_list2 component_decl ';'
                { $$ = chainon ($1, $2); }
        | component_decl_list2 ';'
                { if (pedantic)
                    pedwarn ("extra semicolon in struct or union specified"); }
ifobjc
        /* foo(sizeof(struct{ @defs(ClassName)})); */
        | DEFS '(' CLASSNAME ')'
                {
                  tree interface = lookup_interface ($3);

                  if (interface)
                    $$ = get_class_ivars (interface);
                  else
                    {
                      error ("Cannot find interface declaration for `%s'",
                             IDENTIFIER_POINTER ($3));
                      $$ = NULL_TREE;
                    }
                }
end ifobjc
        ;

/* There is a shift-reduce conflict here, because `components' may
   start with a `typename'.  It happens that shifting (the default resolution)
   does the right thing, because it treats the `typename' as part of
   a `typed_typespecs'.

   It is possible that this same technique would allow the distinction
   between `notype_initdecls' and `initdecls' to be eliminated.
   But I am being cautious and not trying it.  */

component_decl:
          typed_typespecs setspecs components
                { $$ = $3;
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | typed_typespecs setspecs save_filename save_lineno maybe_attribute
                {
                  /* Support for unnamed structs or unions as members of 
                     structs or unions (which is [a] useful and [b] supports 
                     MS P-SDK).  */
                  if (pedantic)
                    pedwarn ("ISO C doesn't support unnamed structs/unions");

                  $$ = grokfield($3, $4, NULL, current_declspecs, NULL_TREE);
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack);
                }
    | nonempty_type_quals setspecs components
                { $$ = $3;
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | nonempty_type_quals
                { if (pedantic)
                    pedwarn ("ISO C forbids member declarations with no members");
                  shadow_tag($1);
                  $$ = NULL_TREE; }
        | error
                { $$ = NULL_TREE; }
        | extension component_decl
                { $$ = $2;
                  RESTORE_WARN_FLAGS ($1); }
        ;

components:
          component_declarator
        | components ',' component_declarator
                { $$ = chainon ($1, $3); }
        ;

component_declarator:
          save_filename save_lineno declarator maybe_attribute
                { $$ = grokfield ($1, $2, $3, current_declspecs, NULL_TREE);
                  decl_attributes ($$, $4, prefix_attributes); }
        | save_filename save_lineno
          declarator ':' expr_no_commas maybe_attribute
                { $$ = grokfield ($1, $2, $3, current_declspecs, $5);
                  decl_attributes ($$, $6, prefix_attributes); }
        | save_filename save_lineno ':' expr_no_commas maybe_attribute
                { $$ = grokfield ($1, $2, NULL_TREE, current_declspecs, $4);
                  decl_attributes ($$, $5, prefix_attributes); }
        ;

/* We chain the enumerators in reverse order.
   They are put in forward order where enumlist is used.
   (The order used to be significant, but no longer is so.
   However, we still maintain the order, just to be clean.)  */

enumlist:
          enumerator
        | enumlist ',' enumerator
                { if ($1 == error_mark_node)
                    $$ = $1;
                  else
                    $$ = chainon ($3, $1); }
        | error
                { $$ = error_mark_node; }
        ;


enumerator:
          identifier
                { $$ = build_enumerator ($1, NULL_TREE); }
        | identifier '=' expr_no_commas
                { $$ = build_enumerator ($1, $3); }
        ;

typename:
        typed_typespecs absdcl
                { $$ = build_tree_list ($1, $2); }
        | nonempty_type_quals absdcl
                { $$ = build_tree_list ($1, $2); }
        ;

absdcl:   /* an absolute declarator */
        /* empty */
                { $$ = NULL_TREE; }
        | absdcl1
        ;

nonempty_type_quals:
          TYPE_QUAL
                { $$ = tree_cons (NULL_TREE, $1, NULL_TREE); }
        | nonempty_type_quals TYPE_QUAL
                { $$ = tree_cons (NULL_TREE, $2, $1); }
        ;

type_quals:
          /* empty */
                { $$ = NULL_TREE; }
        | type_quals TYPE_QUAL
                { $$ = tree_cons (NULL_TREE, $2, $1); }
        ;

absdcl1:  /* a nonempty absolute declarator */
          '(' absdcl1 ')'
                { $$ = $2; }
          /* `(typedef)1' is `int'.  */
        | '*' type_quals absdcl1  %prec UNARY
                { $$ = make_pointer_declarator ($2, $3); }
        | '*' type_quals  %prec UNARY
                { $$ = make_pointer_declarator ($2, NULL_TREE); }
        | absdcl1 '(' parmlist  %prec '.'
                { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
        | absdcl1 '[' expr ']'  %prec '.'
                { $$ = build_nt (ARRAY_REF, $1, $3); }
        | absdcl1 '[' ']'  %prec '.'
                { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
        | '(' parmlist  %prec '.'
                { $$ = build_nt (CALL_EXPR, NULL_TREE, $2, NULL_TREE); }
        | '[' expr ']'  %prec '.'
                { $$ = build_nt (ARRAY_REF, NULL_TREE, $2); }
        | '[' ']'  %prec '.'
                { $$ = build_nt (ARRAY_REF, NULL_TREE, NULL_TREE); }
        /* ??? It appears we have to support attributes here, however
           using prefix_attributes is wrong.  */
        | attributes setattrs absdcl1
                { $$ = $3; }
        ;

/* at least one statement, the first of which parses without error.  */
/* stmts is used only after decls, so an invalid first statement
   is actually regarded as an invalid decl and part of the decls.  */

stmts:
        lineno_stmt_or_labels
                {
                  if (pedantic && $1)
                    pedwarn ("ISO C forbids label at end of compound statement");
                }
        ;

lineno_stmt_or_labels:
          lineno_stmt_or_label
        | lineno_stmt_or_labels lineno_stmt_or_label
                { $$ = $2; }
        | lineno_stmt_or_labels errstmt
                { $$ = 0; }
        ;

xstmts:
        /* empty */
        | stmts
        ;

errstmt:  error ';'
        ;

pushlevel:  /* empty */
                { emit_line_note (input_filename, lineno);
                  pushlevel (0);
                  clear_last_expr ();
                  expand_start_bindings (0);
ifobjc
                  if (objc_method_context)
                    add_objc_decls ();
end ifobjc
                }
        ;

/* Read zero or more forward-declarations for labels
   that nested functions can jump to.  */
maybe_label_decls:
          /* empty */
        | label_decls
                { if (pedantic)
                    pedwarn ("ISO C forbids label declarations"); }
        ;

label_decls:
          label_decl
        | label_decls label_decl
        ;

label_decl:
          LABEL identifiers_or_typenames ';'
                { tree link;
                  for (link = $2; link; link = TREE_CHAIN (link))
                    {
                      tree label = shadow_label (TREE_VALUE (link));
                      C_DECLARED_LABEL_FLAG (label) = 1;
                      declare_nonlocal_label (label);
                    }
                }
        ;

/* This is the body of a function definition.
   It causes syntax errors to ignore to the next openbrace.  */
compstmt_or_error:
          compstmt
                {}
        | error compstmt
        ;

compstmt_start: '{' { compstmt_count++; }

compstmt_nostart: '}'
                { $$ = convert (void_type_node, integer_zero_node); }
        | pushlevel maybe_label_decls decls xstmts '}'
                { emit_line_note (input_filename, lineno);
                  expand_end_bindings (getdecls (), 1, 0);
                  $$ = poplevel (1, 1, 0); }
        | pushlevel maybe_label_decls error '}'
                { emit_line_note (input_filename, lineno);
                  expand_end_bindings (getdecls (), kept_level_p (), 0);
                  $$ = poplevel (kept_level_p (), 0, 0); }
        | pushlevel maybe_label_decls stmts '}'
                { emit_line_note (input_filename, lineno);
                  expand_end_bindings (getdecls (), kept_level_p (), 0);
                  $$ = poplevel (kept_level_p (), 0, 0); }
        ;

compstmt_primary_start:
        '(' '{'
                { if (current_function_decl == 0)
                    {
                      error ("braced-group within expression allowed only inside a function");
                      YYERROR;
                    }
                  /* We must force a BLOCK for this level
                     so that, if it is not expanded later,
                     there is a way to turn off the entire subtree of blocks
                     that are contained in it.  */
                  keep_next_level ();
                  push_label_level ();
                  $$ = expand_start_stmt_expr ();
                  compstmt_count++;
                }

compstmt: compstmt_start compstmt_nostart
                { $$ = $2; }
        ;

/* Value is number of statements counted as of the closeparen.  */
simple_if:
          if_prefix lineno_labeled_stmt
/* Make sure c_expand_end_cond is run once
   for each call to c_expand_start_cond.
   Otherwise a crash is likely.  */
        | if_prefix error
        ;

if_prefix:
          IF '(' expr ')'
                { emit_line_note ($<filename>-1, $<lineno>0);
                  c_expand_start_cond (truthvalue_conversion ($3), 0, 
                                       compstmt_count);
                  $<itype>$ = stmt_count;
                  if_stmt_file = $<filename>-1;
                  if_stmt_line = $<lineno>0;
                  position_after_white_space (); }
        ;

/* This is a subroutine of stmt.
   It is used twice, once for valid DO statements
   and once for catching errors in parsing the end test.  */
do_stmt_start:
          DO
                { stmt_count++;
                  compstmt_count++;
                  emit_line_note ($<filename>-1, $<lineno>0);
                  /* See comment in `while' alternative, above.  */
                  emit_nop ();
                  expand_start_loop_continue_elsewhere (1);
                  position_after_white_space (); }
          lineno_labeled_stmt WHILE
                { expand_loop_continue_here (); }
        ;

save_filename:
                { $$ = input_filename; }
        ;

save_lineno:
                { $$ = lineno; }
        ;

lineno_labeled_stmt:
          save_filename save_lineno stmt
                { }
/*      | save_filename save_lineno error
                { }
*/
        | save_filename save_lineno label lineno_labeled_stmt
                { }
        ;

lineno_stmt_or_label:
          save_filename save_lineno stmt_or_label
                { $$ = $3; }
        ;

stmt_or_label:
          stmt
                { $$ = 0; }
        | label
                { $$ = 1; }
        ;

/* Parse a single real statement, not including any labels.  */
stmt:
          compstmt
                { stmt_count++; }
        | expr ';'
                { stmt_count++;
                  emit_line_note ($<filename>-1, $<lineno>0);
/* It appears that this should not be done--that a non-lvalue array
   shouldn't get an error if the value isn't used.
   Section 3.2.2.1 says that an array lvalue gets converted to a pointer
   if it appears as a top-level expression,
   but says nothing about non-lvalue arrays.  */
#if 0
                  /* Call default_conversion to get an error
                     on referring to a register array if pedantic.  */
                  if (TREE_CODE (TREE_TYPE ($1)) == ARRAY_TYPE
                      || TREE_CODE (TREE_TYPE ($1)) == FUNCTION_TYPE)
                    $1 = default_conversion ($1);
#endif
                  expand_expr_stmt ($1); }
        | simple_if ELSE
                { c_expand_start_else ();
                  $<itype>1 = stmt_count;
                  position_after_white_space (); }
          lineno_labeled_stmt
                { c_expand_end_cond ();
                  if (extra_warnings && stmt_count == $<itype>1)
                    warning ("empty body in an else-statement"); }
        | simple_if %prec IF
                { c_expand_end_cond ();
                  /* This warning is here instead of in simple_if, because we
                     do not want a warning if an empty if is followed by an
                     else statement.  Increment stmt_count so we don't
                     give a second error if this is a nested `if'.  */
                  if (extra_warnings && stmt_count++ == $<itype>1)
                    warning_with_file_and_line (if_stmt_file, if_stmt_line,
                                                "empty body in an if-statement"); }
/* Make sure c_expand_end_cond is run once
   for each call to c_expand_start_cond.
   Otherwise a crash is likely.  */
        | simple_if ELSE error
                { c_expand_end_cond (); }
        | WHILE
                { stmt_count++;
                  emit_line_note ($<filename>-1, $<lineno>0);
                  /* The emit_nop used to come before emit_line_note,
                     but that made the nop seem like part of the preceding line.
                     And that was confusing when the preceding line was
                     inside of an if statement and was not really executed.
                     I think it ought to work to put the nop after the line number.
                     We will see.  --rms, July 15, 1991.  */
                  emit_nop (); }
          '(' expr ')'
                { /* Don't start the loop till we have succeeded
                     in parsing the end test.  This is to make sure
                     that we end every loop we start.  */
                  expand_start_loop (1);
                  emit_line_note (input_filename, lineno);
                  expand_exit_loop_if_false (NULL_PTR,
                                             truthvalue_conversion ($4));
                  position_after_white_space (); }
          lineno_labeled_stmt
                { expand_end_loop (); }
        | do_stmt_start
          '(' expr ')' ';'
                { emit_line_note (input_filename, lineno);
                  expand_exit_loop_if_false (NULL_PTR,
                                             truthvalue_conversion ($3));
                  expand_end_loop (); }
/* This rule is needed to make sure we end every loop we start.  */
        | do_stmt_start error
                { expand_end_loop (); }
        | FOR
          '(' xexpr ';'
                { stmt_count++;
                  emit_line_note ($<filename>-1, $<lineno>0);
                  /* See comment in `while' alternative, above.  */
                  emit_nop ();
                  if ($3) c_expand_expr_stmt ($3);
                  /* Next step is to call expand_start_loop_continue_elsewhere,
                     but wait till after we parse the entire for (...).
                     Otherwise, invalid input might cause us to call that
                     fn without calling expand_end_loop.  */
                }
          xexpr ';'
                /* Can't emit now; wait till after expand_start_loop...  */
                { $<lineno>7 = lineno;
                  $<filename>$ = input_filename; }
          xexpr ')'
                { 
                  /* Start the loop.  Doing this after parsing
                     all the expressions ensures we will end the loop.  */
                  expand_start_loop_continue_elsewhere (1);
                  /* Emit the end-test, with a line number.  */
                  emit_line_note ($<filename>8, $<lineno>7);
                  if ($6)
                    expand_exit_loop_if_false (NULL_PTR,
                                               truthvalue_conversion ($6));
                  $<lineno>7 = lineno;
                  $<filename>8 = input_filename;
                  position_after_white_space (); }
          lineno_labeled_stmt
                { /* Emit the increment expression, with a line number.  */
                  emit_line_note ($<filename>8, $<lineno>7);
                  expand_loop_continue_here ();
                  if ($9)
                    c_expand_expr_stmt ($9);
                  expand_end_loop (); }
        | SWITCH '(' expr ')'
                { stmt_count++;
                  emit_line_note ($<filename>-1, $<lineno>0);
                  c_expand_start_case ($3);
                  position_after_white_space (); }
          lineno_labeled_stmt
                { expand_end_case ($3); }
        | BREAK ';'
                { build_break_stmt ();
                  stmt_count++;
                  genrtl_break_stmt (); }
        | CONTINUE ';'
                { build_continue_stmt ();
                  stmt_count++;
                  genrtl_continue_stmt (); }
        | RETURN ';'
                { tree return_stmt = build_return_stmt (NULL_TREE);
                  stmt_count++;
                  genrtl_return_stmt (RETURN_EXPR(return_stmt)); }
        | RETURN expr ';'
                { tree return_stmt = build_return_stmt ($2);
                  stmt_count++;
                  genrtl_return_stmt (RETURN_EXPR(return_stmt)); }
        | ASM_KEYWORD maybe_type_qual '(' expr ')' ';'
                { stmt_count++;
                  emit_line_note ($<filename>-1, $<lineno>0);
                  STRIP_NOPS ($4);
                  if ((TREE_CODE ($4) == ADDR_EXPR
                       && TREE_CODE (TREE_OPERAND ($4, 0)) == STRING_CST)
                      || TREE_CODE ($4) == STRING_CST)
                    expand_asm ($4);
                  else
                    error ("argument of `asm' is not a constant string"); }
        /* This is the case with just output operands.  */
        | ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ')' ';'
                { stmt_count++;
                  emit_line_note ($<filename>-1, $<lineno>0);
                  c_expand_asm_operands ($4, $6, NULL_TREE, NULL_TREE,
                                         $2 == ridpointers[(int)RID_VOLATILE],
                                         input_filename, lineno); }
        /* This is the case with input operands as well.  */
        | ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ':' asm_operands ')' ';'
                { stmt_count++;
                  emit_line_note ($<filename>-1, $<lineno>0);
                  c_expand_asm_operands ($4, $6, $8, NULL_TREE,
                                         $2 == ridpointers[(int)RID_VOLATILE],
                                         input_filename, lineno); }
        /* This is the case with clobbered registers as well.  */
        | ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ':'
          asm_operands ':' asm_clobbers ')' ';'
                { stmt_count++;
                  emit_line_note ($<filename>-1, $<lineno>0);
                  c_expand_asm_operands ($4, $6, $8, $10,
                                         $2 == ridpointers[(int)RID_VOLATILE],
                                         input_filename, lineno); }
        | GOTO identifier ';'
                { tree decl;
                  stmt_count++;
                  emit_line_note ($<filename>-1, $<lineno>0);
                  decl = lookup_label ($2);
                  if (decl != 0)
                    {
                      TREE_USED (decl) = 1;
                      expand_goto (decl);
                    }
                }
        | GOTO '*' expr ';'
                { if (pedantic)
                    pedwarn ("ISO C forbids `goto *expr;'");
                  stmt_count++;
                  emit_line_note ($<filename>-1, $<lineno>0);
                  expand_computed_goto (convert (ptr_type_node, $3)); }
        | ';'
        ;

/* Any kind of label, including jump labels and case labels.
   ANSI C accepts labels only before statements, but we allow them
   also at the end of a compound statement.  */

label:    CASE expr_no_commas ':'
                { tree case_label_tree = build_case_label ($2, NULL_TREE);
                  stmt_count++;
                  genrtl_case_label(CASE_LOW(case_label_tree), CASE_HIGH(case_label_tree));
                  position_after_white_space ();
                }
        | CASE expr_no_commas ELLIPSIS expr_no_commas ':'
                { tree case_label_tree = build_case_label ($2, $4);
                  stmt_count++;
                  genrtl_case_label(CASE_LOW(case_label_tree), CASE_HIGH(case_label_tree));
                  position_after_white_space ();
                }
        | DEFAULT ':'
                { tree case_label_tree = build_case_label (NULL_TREE, NULL_TREE);
                  stmt_count++;
                  genrtl_case_label(CASE_LOW(case_label_tree), CASE_HIGH(case_label_tree));
                  position_after_white_space ();
                }
        | identifier ':' save_filename save_lineno maybe_attribute
                { tree label = define_label ($3, $4, $1);
                  stmt_count++;
                  emit_nop ();
                  if (label)
                    {
                      expand_label (label);
                      decl_attributes (label, $5, NULL_TREE);
                    }
                  position_after_white_space (); }
        ;

/* Either a type-qualifier or nothing.  First thing in an `asm' statement.  */

maybe_type_qual:
        /* empty */
                { emit_line_note (input_filename, lineno);
                  $$ = NULL_TREE; }
        | TYPE_QUAL
                { emit_line_note (input_filename, lineno); }
        ;

xexpr:
        /* empty */
                { $$ = NULL_TREE; }
        | expr
        ;

/* These are the operands other than the first string and colon
   in  asm ("addextend %2,%1": "=dm" (x), "0" (y), "g" (*x))  */
asm_operands: /* empty */
                { $$ = NULL_TREE; }
        | nonnull_asm_operands
        ;

nonnull_asm_operands:
          asm_operand
        | nonnull_asm_operands ',' asm_operand
                { $$ = chainon ($1, $3); }
        ;

asm_operand:
          STRING '(' expr ')'
                { $$ = build_tree_list ($1, $3); }
        ;

asm_clobbers:
          string
                { $$ = tree_cons (NULL_TREE, combine_strings ($1), NULL_TREE); }
        | asm_clobbers ',' string
                { $$ = tree_cons (NULL_TREE, combine_strings ($3), $1); }
        ;
\f
/* This is what appears inside the parens in a function declarator.
   Its value is a list of ..._TYPE nodes.  */
parmlist:
                { pushlevel (0);
                  clear_parm_order ();
                  declare_parm_level (0); }
          parmlist_1
                { $$ = $2;
                  parmlist_tags_warning ();
                  poplevel (0, 0, 0); }
        ;

parmlist_1:
          parmlist_2 ')'
        | parms ';'
                { tree parm;
                  if (pedantic)
                    pedwarn ("ISO C forbids forward parameter declarations");
                  /* Mark the forward decls as such.  */
                  for (parm = getdecls (); parm; parm = TREE_CHAIN (parm))
                    TREE_ASM_WRITTEN (parm) = 1;
                  clear_parm_order (); }
          parmlist_1
                { $$ = $4; }
        | error ')'
                { $$ = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE); }
        ;

/* This is what appears inside the parens in a function declarator.
   Is value is represented in the format that grokdeclarator expects.  */
parmlist_2:  /* empty */
                { $$ = get_parm_info (0); }
        | ELLIPSIS
                { $$ = get_parm_info (0);
                  /* Gcc used to allow this as an extension.  However, it does
                     not work for all targets, and thus has been disabled.
                     Also, since func (...) and func () are indistinguishable,
                     it caused problems with the code in expand_builtin which
                     tries to verify that BUILT_IN_NEXT_ARG is being used
                     correctly.  */
                  error ("ISO C requires a named argument before `...'");
                }
        | parms
                { $$ = get_parm_info (1); }
        | parms ',' ELLIPSIS
                { $$ = get_parm_info (0); }
        ;

parms:
        parm
                { push_parm_decl ($1); }
        | parms ',' parm
                { push_parm_decl ($3); }
        ;

/* A single parameter declaration or parameter type name,
   as found in a parmlist.  */
parm:
          typed_declspecs setspecs parm_declarator maybe_attribute
                { $$ = build_tree_list (build_tree_list (current_declspecs,
                                                         $3),
                                        build_tree_list (prefix_attributes,
                                                         $4));
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | typed_declspecs setspecs notype_declarator maybe_attribute
                { $$ = build_tree_list (build_tree_list (current_declspecs,
                                                         $3),
                                        build_tree_list (prefix_attributes,
                                                         $4)); 
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | typed_declspecs setspecs absdcl maybe_attribute
                { $$ = build_tree_list (build_tree_list (current_declspecs,
                                                         $3),
                                        build_tree_list (prefix_attributes,
                                                         $4));
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | declmods setspecs notype_declarator maybe_attribute
                { $$ = build_tree_list (build_tree_list (current_declspecs,
                                                         $3),
                                        build_tree_list (prefix_attributes,
                                                         $4));
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }

        | declmods setspecs absdcl maybe_attribute
                { $$ = build_tree_list (build_tree_list (current_declspecs,
                                                         $3),
                                        build_tree_list (prefix_attributes,
                                                         $4));
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        ;

/* This is used in a function definition
   where either a parmlist or an identifier list is ok.
   Its value is a list of ..._TYPE nodes or a list of identifiers.  */
parmlist_or_identifiers:
                { pushlevel (0);
                  clear_parm_order ();
                  declare_parm_level (1); }
          parmlist_or_identifiers_1
                { $$ = $2;
                  parmlist_tags_warning ();
                  poplevel (0, 0, 0); }
        ;

parmlist_or_identifiers_1:
          parmlist_1
        | identifiers ')'
                { tree t;
                  for (t = $1; t; t = TREE_CHAIN (t))
                    if (TREE_VALUE (t) == NULL_TREE)
                      error ("`...' in old-style identifier list");
                  $$ = tree_cons (NULL_TREE, NULL_TREE, $1); }
        ;

/* A nonempty list of identifiers.  */
identifiers:
        IDENTIFIER
                { $$ = build_tree_list (NULL_TREE, $1); }
        | identifiers ',' IDENTIFIER
                { $$ = chainon ($1, build_tree_list (NULL_TREE, $3)); }
        ;

/* A nonempty list of identifiers, including typenames.  */
identifiers_or_typenames:
        identifier
                { $$ = build_tree_list (NULL_TREE, $1); }
        | identifiers_or_typenames ',' identifier
                { $$ = chainon ($1, build_tree_list (NULL_TREE, $3)); }
        ;

extension:
        EXTENSION
                { $$ = SAVE_WARN_FLAGS();
                  pedantic = 0;
                  warn_pointer_arith = 0; }
        ;
\f
ifobjc
/* Objective-C productions.  */

objcdef:
          classdef
        | classdecl
        | aliasdecl
        | protocoldef
        | methoddef
        | END
                {
                  if (objc_implementation_context)
                    {
                      finish_class (objc_implementation_context);
                      objc_ivar_chain = NULL_TREE;
                      objc_implementation_context = NULL_TREE;
                    }
                  else
                    warning ("`@end' must appear in an implementation context");
                }
        ;

/* A nonempty list of identifiers.  */
identifier_list:
        identifier
                { $$ = build_tree_list (NULL_TREE, $1); }
        | identifier_list ',' identifier
                { $$ = chainon ($1, build_tree_list (NULL_TREE, $3)); }
        ;

classdecl:
          CLASS identifier_list ';'
                {
                  objc_declare_class ($2);
                }

aliasdecl:
          ALIAS identifier identifier ';'
                {
                  objc_declare_alias ($2, $3);
                }

classdef:
          INTERFACE identifier protocolrefs '{'
                {
                  objc_interface_context = objc_ivar_context
                    = start_class (CLASS_INTERFACE_TYPE, $2, NULL_TREE, $3);
                  objc_public_flag = 0;
                }
          ivar_decl_list '}'
                {
                  continue_class (objc_interface_context);
                }
          methodprotolist
          END
                {
                  finish_class (objc_interface_context);
                  objc_interface_context = NULL_TREE;
                }

        | INTERFACE identifier protocolrefs
                {
                  objc_interface_context
                    = start_class (CLASS_INTERFACE_TYPE, $2, NULL_TREE, $3);
                  continue_class (objc_interface_context);
                }
          methodprotolist
          END
                {
                  finish_class (objc_interface_context);
                  objc_interface_context = NULL_TREE;
                }

        | INTERFACE identifier ':' identifier protocolrefs '{'
                {
                  objc_interface_context = objc_ivar_context
                    = start_class (CLASS_INTERFACE_TYPE, $2, $4, $5);
                  objc_public_flag = 0;
                }
          ivar_decl_list '}'
                {
                  continue_class (objc_interface_context);
                }
          methodprotolist
          END
                {
                  finish_class (objc_interface_context);
                  objc_interface_context = NULL_TREE;
                }

        | INTERFACE identifier ':' identifier protocolrefs
                {
                  objc_interface_context
                    = start_class (CLASS_INTERFACE_TYPE, $2, $4, $5);
                  continue_class (objc_interface_context);
                }
          methodprotolist
          END
                {
                  finish_class (objc_interface_context);
                  objc_interface_context = NULL_TREE;
                }

        | IMPLEMENTATION identifier '{'
                {
                  objc_implementation_context = objc_ivar_context
                    = start_class (CLASS_IMPLEMENTATION_TYPE, $2, NULL_TREE, NULL_TREE);
                  objc_public_flag = 0;
                }
          ivar_decl_list '}'
                {
                  objc_ivar_chain
                    = continue_class (objc_implementation_context);
                }

        | IMPLEMENTATION identifier
                {
                  objc_implementation_context
                    = start_class (CLASS_IMPLEMENTATION_TYPE, $2, NULL_TREE, NULL_TREE);
                  objc_ivar_chain
                    = continue_class (objc_implementation_context);
                }

        | IMPLEMENTATION identifier ':' identifier '{'
                {
                  objc_implementation_context = objc_ivar_context
                    = start_class (CLASS_IMPLEMENTATION_TYPE, $2, $4, NULL_TREE);
                  objc_public_flag = 0;
                }
          ivar_decl_list '}'
                {
                  objc_ivar_chain
                    = continue_class (objc_implementation_context);
                }

        | IMPLEMENTATION identifier ':' identifier
                {
                  objc_implementation_context
                    = start_class (CLASS_IMPLEMENTATION_TYPE, $2, $4, NULL_TREE);
                  objc_ivar_chain
                    = continue_class (objc_implementation_context);
                }

        | INTERFACE identifier '(' identifier ')' protocolrefs
                {
                  objc_interface_context
                    = start_class (CATEGORY_INTERFACE_TYPE, $2, $4, $6);
                  continue_class (objc_interface_context);
                }
          methodprotolist
          END
                {
                  finish_class (objc_interface_context);
                  objc_interface_context = NULL_TREE;
                }

        | IMPLEMENTATION identifier '(' identifier ')'
                {
                  objc_implementation_context
                    = start_class (CATEGORY_IMPLEMENTATION_TYPE, $2, $4, NULL_TREE);
                  objc_ivar_chain
                    = continue_class (objc_implementation_context);
                }
        ;

protocoldef:
          PROTOCOL identifier protocolrefs
                {
                  remember_protocol_qualifiers ();
                  objc_interface_context
                    = start_protocol(PROTOCOL_INTERFACE_TYPE, $2, $3);
                }
          methodprotolist END
                {
                  forget_protocol_qualifiers();
                  finish_protocol(objc_interface_context);
                  objc_interface_context = NULL_TREE;
                }
        ;

protocolrefs:
          /* empty */
                {
                  $$ = NULL_TREE;
                }
        | non_empty_protocolrefs
        ;

non_empty_protocolrefs:
          ARITHCOMPARE identifier_list ARITHCOMPARE
                {
                  if ($1 == LT_EXPR && $3 == GT_EXPR)
                    $$ = $2;
                  else
                    YYERROR1;
                }
        ;

ivar_decl_list:
          ivar_decl_list visibility_spec ivar_decls
        | ivar_decls
        ;

visibility_spec:
          PRIVATE { objc_public_flag = 2; }
        | PROTECTED { objc_public_flag = 0; }
        | PUBLIC { objc_public_flag = 1; }
        ;

ivar_decls:
          /* empty */
                {
                  $$ = NULL_TREE;
                }
        | ivar_decls ivar_decl ';'
        | ivar_decls ';'
                {
                  if (pedantic)
                    pedwarn ("extra semicolon in struct or union specified");
                }
        ;


/* There is a shift-reduce conflict here, because `components' may
   start with a `typename'.  It happens that shifting (the default resolution)
   does the right thing, because it treats the `typename' as part of
   a `typed_typespecs'.

   It is possible that this same technique would allow the distinction
   between `notype_initdecls' and `initdecls' to be eliminated.
   But I am being cautious and not trying it.  */

ivar_decl:
        typed_typespecs setspecs ivars
                { $$ = $3;
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | nonempty_type_quals setspecs ivars
                { $$ = $3;
                  current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | error
                { $$ = NULL_TREE; }
        ;

ivars:
          /* empty */
                { $$ = NULL_TREE; }
        | ivar_declarator
        | ivars ',' ivar_declarator
        ;

ivar_declarator:
          declarator
                {
                  $$ = add_instance_variable (objc_ivar_context,
                                              objc_public_flag,
                                              $1, current_declspecs,
                                              NULL_TREE);
                }
        | declarator ':' expr_no_commas
                {
                  $$ = add_instance_variable (objc_ivar_context,
                                              objc_public_flag,
                                              $1, current_declspecs, $3);
                }
        | ':' expr_no_commas
                {
                  $$ = add_instance_variable (objc_ivar_context,
                                              objc_public_flag,
                                              NULL_TREE,
                                              current_declspecs, $2);
                }
        ;

methoddef:
          '+'
                {
                  remember_protocol_qualifiers ();
                  if (objc_implementation_context)
                    objc_inherit_code = CLASS_METHOD_DECL;
                  else
                    fatal ("method definition not in class context");
                }
          methoddecl
                {
                  forget_protocol_qualifiers ();
                  add_class_method (objc_implementation_context, $3);
                  start_method_def ($3);
                  objc_method_context = $3;
                }
          optarglist
                {
                  continue_method_def ();
                }
          compstmt_or_error
                {
                  finish_method_def ();
                  objc_method_context = NULL_TREE;
                }

        | '-'
                {
                  remember_protocol_qualifiers ();
                  if (objc_implementation_context)
                    objc_inherit_code = INSTANCE_METHOD_DECL;
                  else
                    fatal ("method definition not in class context");
                }
          methoddecl
                {
                  forget_protocol_qualifiers ();
                  add_instance_method (objc_implementation_context, $3);
                  start_method_def ($3);
                  objc_method_context = $3;
                }
          optarglist
                {
                  continue_method_def ();
                }
          compstmt_or_error
                {
                  finish_method_def ();
                  objc_method_context = NULL_TREE;
                }
        ;

/* the reason for the strange actions in this rule
 is so that notype_initdecls when reached via datadef
 can find a valid list of type and sc specs in $0. */

methodprotolist:
          /* empty  */
        | {$<ttype>$ = NULL_TREE; } methodprotolist2
        ;

methodprotolist2:                /* eliminates a shift/reduce conflict */
           methodproto
        |  datadef
        | methodprotolist2 methodproto
        | methodprotolist2 {$<ttype>$ = NULL_TREE; } datadef
        ;

semi_or_error:
          ';'
        | error
        ;

methodproto:
          '+'
                {
                  /* Remember protocol qualifiers in prototypes.  */
                  remember_protocol_qualifiers ();
                  objc_inherit_code = CLASS_METHOD_DECL;
                }
          methoddecl
                {
                  /* Forget protocol qualifiers here.  */
                  forget_protocol_qualifiers ();
                  add_class_method (objc_interface_context, $3);
                }
          semi_or_error

        | '-'
                {
                  /* Remember protocol qualifiers in prototypes.  */
                  remember_protocol_qualifiers ();
                  objc_inherit_code = INSTANCE_METHOD_DECL;
                }
          methoddecl
                {
                  /* Forget protocol qualifiers here.  */
                  forget_protocol_qualifiers ();
                  add_instance_method (objc_interface_context, $3);
                }
          semi_or_error
        ;

methoddecl:
          '(' typename ')' unaryselector
                {
                  $$ = build_method_decl (objc_inherit_code, $2, $4, NULL_TREE);
                }

        | unaryselector
                {
                  $$ = build_method_decl (objc_inherit_code, NULL_TREE, $1, NULL_TREE);
                }

        | '(' typename ')' keywordselector optparmlist
                {
                  $$ = build_method_decl (objc_inherit_code, $2, $4, $5);
                }

        | keywordselector optparmlist
                {
                  $$ = build_method_decl (objc_inherit_code, NULL_TREE, $1, $2);
                }
        ;

/* "optarglist" assumes that start_method_def has already been called...
   if it is not, the "xdecls" will not be placed in the proper scope */

optarglist:
          /* empty */
        | ';' myxdecls
        ;

/* to get around the following situation: "int foo (int a) int b; {}" that
   is synthesized when parsing "- a:a b:b; id c; id d; { ... }" */

myxdecls:
          /* empty */
        | mydecls
        ;

mydecls:
        mydecl
        | errstmt
        | mydecls mydecl
        | mydecl errstmt
        ;

mydecl:
        typed_declspecs setspecs myparms ';'
                { current_declspecs = TREE_VALUE (declspec_stack);
                  prefix_attributes = TREE_PURPOSE (declspec_stack);
                  declspec_stack = TREE_CHAIN (declspec_stack); }
        | typed_declspecs ';'
                { shadow_tag ($1); }
        | declmods ';'
                { pedwarn ("empty declaration"); }
        ;

myparms:
        myparm
                { push_parm_decl ($1); }
        | myparms ',' myparm
                { push_parm_decl ($3); }
        ;

/* A single parameter declaration or parameter type name,
   as found in a parmlist. DOES NOT ALLOW AN INITIALIZER OR ASMSPEC */

myparm:
          parm_declarator maybe_attribute
                { $$ = build_tree_list (build_tree_list (current_declspecs,
                                                         $1),
                                        build_tree_list (prefix_attributes,
                                                         $2)); }
        | notype_declarator maybe_attribute
                { $$ = build_tree_list (build_tree_list (current_declspecs,
                                                         $1),
                                        build_tree_list (prefix_attributes,
                                                         $2)); }
        | absdcl maybe_attribute
                { $$ = build_tree_list (build_tree_list (current_declspecs,
                                                         $1),
                                        build_tree_list (prefix_attributes,
                                                         $2)); }
        ;

optparmlist:
          /* empty */
                {
                  $$ = NULL_TREE;
                }
        | ',' ELLIPSIS
                {
                  /* oh what a kludge! */
                  $$ = objc_ellipsis_node;
                }
        | ','
                {
                  pushlevel (0);
                }
          parmlist_2
                {
                  /* returns a tree list node generated by get_parm_info */
                  $$ = $3;
                  poplevel (0, 0, 0);
                }
        ;

unaryselector:
          selector
        ;

keywordselector:
          keyworddecl

        | keywordselector keyworddecl
                {
                  $$ = chainon ($1, $2);
                }
        ;

selector:
          IDENTIFIER
        | TYPENAME
        | OBJECTNAME
        | reservedwords
        ;

reservedwords:
          ENUM { $$ = get_identifier (token_buffer); }
        | STRUCT { $$ = get_identifier (token_buffer); }
        | UNION { $$ = get_identifier (token_buffer); }
        | IF { $$ = get_identifier (token_buffer); }
        | ELSE { $$ = get_identifier (token_buffer); }
        | WHILE { $$ = get_identifier (token_buffer); }
        | DO { $$ = get_identifier (token_buffer); }
        | FOR { $$ = get_identifier (token_buffer); }
        | SWITCH { $$ = get_identifier (token_buffer); }
        | CASE { $$ = get_identifier (token_buffer); }
        | DEFAULT { $$ = get_identifier (token_buffer); }
        | BREAK { $$ = get_identifier (token_buffer); }
        | CONTINUE { $$ = get_identifier (token_buffer); }
        | RETURN  { $$ = get_identifier (token_buffer); }
        | GOTO { $$ = get_identifier (token_buffer); }
        | ASM_KEYWORD { $$ = get_identifier (token_buffer); }
        | SIZEOF { $$ = get_identifier (token_buffer); }
        | TYPEOF { $$ = get_identifier (token_buffer); }
        | ALIGNOF { $$ = get_identifier (token_buffer); }
        | TYPESPEC | TYPE_QUAL
        ;

keyworddecl:
          selector ':' '(' typename ')' identifier
                {
                  $$ = build_keyword_decl ($1, $4, $6);
                }

        | selector ':' identifier
                {
                  $$ = build_keyword_decl ($1, NULL_TREE, $3);
                }

        | ':' '(' typename ')' identifier
                {
                  $$ = build_keyword_decl (NULL_TREE, $3, $5);
                }

        | ':' identifier
                {
                  $$ = build_keyword_decl (NULL_TREE, NULL_TREE, $2);
                }
        ;

messageargs:
          selector
        | keywordarglist
        ;

keywordarglist:
          keywordarg
        | keywordarglist keywordarg
                {
                  $$ = chainon ($1, $2);
                }
        ;


keywordexpr:
          nonnull_exprlist
                {
                  if (TREE_CHAIN ($1) == NULL_TREE)
                    /* just return the expr., remove a level of indirection */
                    $$ = TREE_VALUE ($1);
                  else
                    /* we have a comma expr., we will collapse later */
                    $$ = $1;
                }
        ;

keywordarg:
          selector ':' keywordexpr
                {
                  $$ = build_tree_list ($1, $3);
                }
        | ':' keywordexpr
                {
                  $$ = build_tree_list (NULL_TREE, $2);
                }
        ;

receiver:
          expr
        | CLASSNAME
                {
                  $$ = get_class_reference ($1);
                }
        ;

objcmessageexpr:
          '['
                { objc_receiver_context = 1; }
          receiver
                { objc_receiver_context = 0; }
          messageargs ']'
                {
                  $$ = build_tree_list ($3, $5);
                }
        ;

selectorarg:
          selector
        | keywordnamelist
        ;

keywordnamelist:
          keywordname
        | keywordnamelist keywordname
                {
                  $$ = chainon ($1, $2);
                }
        ;

keywordname:
          selector ':'
                {
                  $$ = build_tree_list ($1, NULL_TREE);
                }
        | ':'
                {
                  $$ = build_tree_list (NULL_TREE, NULL_TREE);
                }
        ;

objcselectorexpr:
          SELECTOR '(' selectorarg ')'
                {
                  $$ = $3;
                }
        ;

objcprotocolexpr:
          PROTOCOL '(' identifier ')'
                {
                  $$ = $3;
                }
        ;

/* extension to support C-structures in the archiver */

objcencodeexpr:
          ENCODE '(' typename ')'
                {
                  $$ = groktypename ($3);
                }
        ;

end ifobjc
%%