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c-parse.y
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/* YACC parser for C syntax and for Objective C. -*-c-*-
Copyright (C) 1987, 88, 89, 92, 93, 94, 1995 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. */
%expect 34
/* These are the 23 conflicts you should get in parse.output;
the state numbers may vary if minor changes in the grammar are made.
State 42 contains 1 shift/reduce conflict. (Two ways to parse ATTRIBUTE.)
State 44 contains 1 shift/reduce conflict. (Two ways to recover from error.)
State 103 contains 1 shift/reduce conflict. (Two ways to recover from error.)
State 110 contains 1 shift/reduce conflict. (Two ways to parse ATTRIBUTE.)
State 111 contains 1 shift/reduce conflict. (Two ways to recover from error.)
State 115 contains 1 shift/reduce conflict. (Two ways to recover from error.)
State 132 contains 1 shift/reduce conflict. (See comment at component_decl.)
State 180 contains 1 shift/reduce conflict. (Two ways to parse ATTRIBUTE.)
State 194 contains 2 shift/reduce conflict. (Four ways to parse this.)
State 202 contains 1 shift/reduce conflict. (Two ways to recover from error.)
State 214 contains 1 shift/reduce conflict. (Two ways to recover from error.)
State 220 contains 1 shift/reduce conflict. (Two ways to recover from error.)
State 304 contains 2 shift/reduce conflicts. (Four ways to parse this.)
State 335 contains 2 shift/reduce conflicts. (Four ways to parse this.)
State 347 contains 1 shift/reduce conflict. (Two ways to parse ATTRIBUTES.)
State 352 contains 1 shift/reduce conflict. (Two ways to parse ATTRIBUTES.)
State 383 contains 2 shift/reduce conflicts. (Four ways to parse this.)
State 434 contains 2 shift/reduce conflicts. (Four ways to parse this.) */
%{
#include <stdio.h>
#include <errno.h>
#include <setjmp.h>
#include "config.h"
#include "tree.h"
#include "input.h"
#include "c-lex.h"
#include "c-tree.h"
#include "flags.h"
#ifdef MULTIBYTE_CHARS
#include <stdlib.h>
#include <locale.h>
#endif
/* Since parsers are distinct for each language, put the language string
definition here. */
char *language_string = "GNU C";
#ifndef errno
extern int errno;
#endif
void yyerror ();
/* 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;
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" or "volatile".
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
/* 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 OBJC_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> 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
%type <ttype> compstmt
%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> 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
%{
/* Number of statements (loosely speaking) seen so far. */
static int stmt_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 char *if_stmt_file;
static int if_stmt_line;
/* List of types and structure classes of the current declaration. */
static tree current_declspecs;
static tree prefix_attributes = NULL_TREE;
/* Stack of saved values of current_declspecs and prefix_attributes. */
static tree declspec_stack;
/* 1 if we explained undeclared var errors. */
static int undeclared_variable_notice;
/* 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 ();
%}
%%
program: /* empty */
{ if (pedantic)
pedwarn ("ANSI 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; } extdef
;
extdef:
fndef
| datadef
| 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"); }
;
datadef:
setspecs notype_initdecls ';'
{ if (pedantic)
error ("ANSI 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);
resume_momentary ($1); }
| declmods setspecs notype_initdecls ';'
{ current_declspecs = TREE_VALUE (declspec_stack);
prefix_attributes = TREE_PURPOSE (declspec_stack);
declspec_stack = TREE_CHAIN (declspec_stack);
resume_momentary ($2); }
| typed_declspecs setspecs initdecls ';'
{ current_declspecs = TREE_VALUE (declspec_stack);
prefix_attributes = TREE_PURPOSE (declspec_stack);
declspec_stack = TREE_CHAIN (declspec_stack);
resume_momentary ($2); }
| declmods ';'
{ pedwarn ("empty declaration"); }
| typed_declspecs ';'
{ shadow_tag ($1); }
| error ';'
| error '}'
| ';'
{ if (pedantic)
pedwarn ("ANSI C does not allow extra `;' outside of a function"); }
;
fndef:
typed_declspecs setspecs declarator
{ if (! start_function ($1, $3, prefix_attributes,
NULL_TREE, 0))
YYERROR1;
reinit_parse_for_function (); }
xdecls
{ 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);
resume_momentary ($2); }
| typed_declspecs setspecs declarator error
{ current_declspecs = TREE_VALUE (declspec_stack);
prefix_attributes = TREE_PURPOSE (declspec_stack);
declspec_stack = TREE_CHAIN (declspec_stack);
resume_momentary ($2); }
| declmods setspecs notype_declarator
{ if (! start_function ($1, $3, prefix_attributes,
NULL_TREE, 0))
YYERROR1;
reinit_parse_for_function (); }
xdecls
{ 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);
resume_momentary ($2); }
| declmods setspecs notype_declarator error
{ current_declspecs = TREE_VALUE (declspec_stack);
prefix_attributes = TREE_PURPOSE (declspec_stack);
declspec_stack = TREE_CHAIN (declspec_stack);
resume_momentary ($2); }
| setspecs notype_declarator
{ if (! start_function (NULL_TREE, $2,
prefix_attributes, NULL_TREE, 0))
YYERROR1;
reinit_parse_for_function (); }
xdecls
{ 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);
resume_momentary ($1); }
| setspecs notype_declarator error
{ current_declspecs = TREE_VALUE (declspec_stack);
prefix_attributes = TREE_PURPOSE (declspec_stack);
declspec_stack = TREE_CHAIN (declspec_stack);
resume_momentary ($1); }
;
identifier:
IDENTIFIER
| TYPENAME
;
unop: '&'
{ $$ = ADDR_EXPR; }
| '-'
{ $$ = NEGATE_EXPR; }
| '+'
{ $$ = CONVERT_EXPR; }
| PLUSPLUS
{ $$ = 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
{ $$ = build_indirect_ref ($2, "unary *"); }
/* __extension__ turns off -pedantic for following primary. */
| EXTENSION
{ $<itype>1 = pedantic;
pedantic = 0; }
cast_expr %prec UNARY
{ $$ = $3;
pedantic = $<itype>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 ("ANSI 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 ("ANSI C forbids `&...'");
$$ = tree_last (DECL_ARGUMENTS (current_function_decl));
$$ = build_unary_op (ADDR_EXPR, $$, 0);
} }
*/
| SIZEOF unary_expr %prec UNARY
{ if (TREE_CODE ($2) == COMPONENT_REF
&& DECL_BIT_FIELD (TREE_OPERAND ($2, 1)))
error ("`sizeof' applied to a bit-field");
$$ = c_sizeof (TREE_TYPE ($2)); }
| SIZEOF '(' typename ')' %prec HYPERUNARY
{ $$ = c_sizeof (groktypename ($3)); }
| ALIGNOF unary_expr %prec UNARY
{ $$ = c_alignof_expr ($2); }
| ALIGNOF '(' typename ')' %prec HYPERUNARY
{ $$ = c_alignof (groktypename ($3)); }
| REALPART cast_expr %prec UNARY
{ $$ = build_unary_op (REALPART_EXPR, $2, 0); }
| IMAGPART cast_expr %prec UNARY
{ $$ = build_unary_op (IMAGPART_EXPR, $2, 0); }
;
cast_expr:
unary_expr
| '(' typename ')' cast_expr %prec UNARY
{ tree type = groktypename ($2);
$$ = 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
{ char *name;
tree result = pop_init_level (0);
tree type = $2;
finish_init ();
if (pedantic)
pedwarn ("ANSI C 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 = "";
$$ = result;
if (TREE_CODE (type) == ARRAY_TYPE && TYPE_SIZE (type) == 0)
{
int failure = complete_array_type (type, $$, 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 expr_no_commas
{ $$ = parser_build_binary_op (TRUTH_ANDIF_EXPR, $1, $3); }
| expr_no_commas OROR expr_no_commas
{ $$ = parser_build_binary_op (TRUTH_ORIF_EXPR, $1, $3); }
| expr_no_commas '?' xexpr ':' expr_no_commas
{ $$ = build_conditional_expr ($1, $3, $5); }
| expr_no_commas '=' expr_no_commas
{ $$ = build_modify_expr ($1, NOP_EXPR, $3);
C_SET_EXP_ORIGINAL_CODE ($$, MODIFY_EXPR); }
| expr_no_commas ASSIGN expr_no_commas
{ $$ = build_modify_expr ($1, $2, $3);
/* This inhibits warnings in truthvalue_conversion. */
C_SET_EXP_ORIGINAL_CODE ($$, ERROR_MARK); }
;
primary:
IDENTIFIER
{
$$ = lastiddecl;
if (!$$ || $$ == error_mark_node)
{
if (yychar == YYEMPTY)
yychar = YYLEX;
if (yychar == '(')
{
{
/* Ordinary implicit function declaration. */
$$ = implicitly_declare ($1);
assemble_external ($$);
TREE_USED ($$) = 1;
}
}
else if (current_function_decl == 0)
{
error ("`%s' undeclared here (not in a function)",
IDENTIFIER_POINTER ($1));
$$ = error_mark_node;
}
else
{
{
if (IDENTIFIER_GLOBAL_VALUE ($1) != error_mark_node
|| IDENTIFIER_ERROR_LOCUS ($1) != current_function_decl)
{
error ("`%s' undeclared (first use this function)",
IDENTIFIER_POINTER ($1));
if (! undeclared_variable_notice)
{
error ("(Each undeclared identifier is reported only once");
error ("for each function it appears in.)");
undeclared_variable_notice = 1;
}
}
$$ = error_mark_node;
/* Prevent repeated error messages. */
IDENTIFIER_GLOBAL_VALUE ($1) = error_mark_node;
IDENTIFIER_ERROR_LOCUS ($1) = current_function_decl;
}
}
}
else if (TREE_TYPE ($$) == error_mark_node)
$$ = error_mark_node;
else if (C_DECL_ANTICIPATED ($$))
{
/* The first time we see a build-in function used,
if it has not been declared. */
C_DECL_ANTICIPATED ($$) = 0;
if (yychar == YYEMPTY)
yychar = YYLEX;
if (yychar == '(')
{
/* Omit the implicit declaration we
would ordinarily do, so we don't lose
the actual built in type.
But print a diagnostic for the mismatch. */
if (TREE_CODE ($$) != FUNCTION_DECL)
error ("`%s' implicitly declared as function",
IDENTIFIER_POINTER (DECL_NAME ($$)));
else if ((TYPE_MODE (TREE_TYPE (TREE_TYPE ($$)))
!= TYPE_MODE (integer_type_node))
&& (TREE_TYPE (TREE_TYPE ($$))
!= void_type_node))
pedwarn ("type mismatch in implicit declaration for built-in function `%s'",
IDENTIFIER_POINTER (DECL_NAME ($$)));
/* If it really returns void, change that to int. */
if (TREE_TYPE (TREE_TYPE ($$)) == void_type_node)
TREE_TYPE ($$)
= build_function_type (integer_type_node,
TYPE_ARG_TYPES (TREE_TYPE ($$)));
}
else
pedwarn ("built-in function `%s' used without declaration",
IDENTIFIER_POINTER (DECL_NAME ($$)));
/* Do what we would ordinarily do when a fn is used. */
assemble_external ($$);
TREE_USED ($$) = 1;
}
else
{
assemble_external ($$);
TREE_USED ($$) = 1;
}
if (TREE_CODE ($$) == CONST_DECL)
{
$$ = DECL_INITIAL ($$);
/* This is to prevent an enum whose value is 0
from being considered a null pointer constant. */
$$ = build1 (NOP_EXPR, TREE_TYPE ($$), $$);
TREE_CONSTANT ($$) = 1;
}
}
| CONSTANT
| string
{ $$ = 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; }
| '('
{ 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_iterator_stack ();
push_label_level ();
$<ttype>$ = expand_start_stmt_expr (); }
compstmt ')'
{ tree rtl_exp;
if (pedantic)
pedwarn ("ANSI C forbids braced-groups within expressions");
pop_iterator_stack ();
pop_label_level ();
rtl_exp = expand_end_stmt_expr ($<ttype>2);
/* The statements have side effects, so the group does. */
TREE_SIDE_EFFECTS (rtl_exp) = 1;
if (TREE_CODE ($3) == BLOCK)
{
/* Make a BIND_EXPR for the BLOCK already made. */
$$ = build (BIND_EXPR, TREE_TYPE (rtl_exp),
NULL_TREE, rtl_exp, $3);
/* Remove the block from the tree at this point.
It gets put back at the proper place
when the BIND_EXPR is expanded. */
delete_block ($3);
}
else
$$ = $3;
}
| primary '(' exprlist ')' %prec '.'
{ $$ = build_function_call ($1, $3); }
| primary '[' expr ']' %prec '.'
{ $$ = build_array_ref ($1, $3); }
| primary '.' identifier
{
$$ = build_component_ref ($1, $3);
}
| primary POINTSAT identifier
{
tree expr = build_indirect_ref ($1, "->");
$$ = build_component_ref (expr, $3);
}
| primary PLUSPLUS
{ $$ = build_unary_op (POSTINCREMENT_EXPR, $1, 0); }
| primary MINUSMINUS
{ $$ = build_unary_op (POSTDECREMENT_EXPR, $1, 0); }
;
/* Produces a STRING_CST with perhaps more STRING_CSTs chained onto it. */
string:
STRING
| string STRING
{ $$ = chainon ($1, $2); }
;
xdecls:
/* empty */
| datadecls
| datadecls ELLIPSIS
/* ... is used here to indicate a varargs function. */
{ c_mark_varargs ();
if (pedantic)
pedwarn ("ANSI C does not permit use of `varargs.h'"); }
;
/* The following are analogous to lineno_decl, decls and decl
except that they do not allow nested functions.
They are used for old-style parm decls. */
lineno_datadecl:
save_filename save_lineno datadecl
{ }
;
datadecls:
lineno_datadecl
| errstmt
| datadecls lineno_datadecl
| lineno_datadecl errstmt
;
datadecl:
typed_declspecs setspecs initdecls ';'
{ current_declspecs = TREE_VALUE (declspec_stack);
prefix_attributes = TREE_PURPOSE (declspec_stack);
declspec_stack = TREE_CHAIN (declspec_stack);
resume_momentary ($2); }
| declmods setspecs notype_initdecls ';'
{ current_declspecs = TREE_VALUE (declspec_stack);
prefix_attributes = TREE_PURPOSE (declspec_stack);
declspec_stack = TREE_CHAIN (declspec_stack);
resume_momentary ($2); }
| typed_declspecs ';'
{ shadow_tag_warned ($1, 1);
pedwarn ("empty declaration"); }
| declmods ';'
{ pedwarn ("empty declaration"); }
;
/* This combination which saves a lineno before a decl
is the normal thing to use, rather than decl itself.
This is to avoid shift/reduce conflicts in contexts
where statement labels are allowed. */
lineno_decl:
save_filename save_lineno decl
{ }
;
decls:
lineno_decl
| errstmt
| decls lineno_decl
| lineno_decl errstmt
;
/* records the type and storage class specs to use for processing
the declarators that follow.
Maintains a stack of outer-level values of current_declspecs,
for the sake of parm declarations nested in function declarators. */
setspecs: /* empty */
{ $$ = suspend_momentary ();
pending_xref_error ();
declspec_stack = tree_cons (prefix_attributes,
current_declspecs,
declspec_stack);
current_declspecs = $<ttype>0;
prefix_attributes = NULL_TREE; }
;
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);
resume_momentary ($2); }
| declmods setspecs notype_initdecls ';'
{ current_declspecs = TREE_VALUE (declspec_stack);
prefix_attributes = TREE_PURPOSE (declspec_stack);
declspec_stack = TREE_CHAIN (declspec_stack);
resume_momentary ($2); }
| typed_declspecs setspecs nested_function
{ current_declspecs = TREE_VALUE (declspec_stack);
prefix_attributes = TREE_PURPOSE (declspec_stack);
declspec_stack = TREE_CHAIN (declspec_stack);
resume_momentary ($2); }
| declmods setspecs notype_nested_function
{ current_declspecs = TREE_VALUE (declspec_stack);
prefix_attributes = TREE_PURPOSE (declspec_stack);
declspec_stack = TREE_CHAIN (declspec_stack);
resume_momentary ($2); }
| typed_declspecs ';'
{ shadow_tag ($1); }
| declmods ';'
{ pedwarn ("empty declaration"); }
;
/* 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. */
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));
$$ = tree_cons (NULL_TREE, $2, $1); }
;
/* List of just storage classes and type modifiers.
A declaration can start with just this, but then it cannot be used
to redeclare a typedef-name. */
declmods:
TYPE_QUAL
{ $$ = tree_cons (NULL_TREE, $1, NULL_TREE);
TREE_STATIC ($$) = 1; }
| SCSPEC
{ $$ = tree_cons (NULL_TREE, $1, NULL_TREE); }
| declmods TYPE_QUAL
{ $$ = tree_cons (NULL_TREE, $2, $1);
TREE_STATIC ($$) = 1; }
| declmods 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;'. */
$$ = lookup_name ($1); }
| TYPEOF '(' expr ')'
{ $$ = 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
;
/* Initializers. `init' is the entry point. */
init: