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binutils-gdb/gdb/c-exp.y
Keith Seitz e8269d5fd9 * c-exp.y (qualified_name): Call CHECK_TYPEDEF before deciding 
that a type is not an aggregate type.
2009-09-21 19:23:46 +00:00

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/* YACC parser for C expressions, for GDB.
Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
1998, 1999, 2000, 2003, 2004, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
This file is part of GDB.
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
/* Parse a C expression from text in a string,
and return the result as a struct expression pointer.
That structure contains arithmetic operations in reverse polish,
with constants represented by operations that are followed by special data.
See expression.h for the details of the format.
What is important here is that it can be built up sequentially
during the process of parsing; the lower levels of the tree always
come first in the result.
Note that malloc's and realloc's in this file are transformed to
xmalloc and xrealloc respectively by the same sed command in the
makefile that remaps any other malloc/realloc inserted by the parser
generator. Doing this with #defines and trying to control the interaction
with include files (<malloc.h> and <stdlib.h> for example) just became
too messy, particularly when such includes can be inserted at random
times by the parser generator. */
%{
#include "defs.h"
#include "gdb_string.h"
#include <ctype.h>
#include "expression.h"
#include "value.h"
#include "parser-defs.h"
#include "language.h"
#include "c-lang.h"
#include "bfd.h" /* Required by objfiles.h. */
#include "symfile.h" /* Required by objfiles.h. */
#include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
#include "charset.h"
#include "block.h"
#include "cp-support.h"
#include "dfp.h"
#include "gdb_assert.h"
#include "macroscope.h"
#define parse_type builtin_type (parse_gdbarch)
/* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
as well as gratuitiously global symbol names, so we can have multiple
yacc generated parsers in gdb. Note that these are only the variables
produced by yacc. If other parser generators (bison, byacc, etc) produce
additional global names that conflict at link time, then those parser
generators need to be fixed instead of adding those names to this list. */
#define yymaxdepth c_maxdepth
#define yyparse c_parse_internal
#define yylex c_lex
#define yyerror c_error
#define yylval c_lval
#define yychar c_char
#define yydebug c_debug
#define yypact c_pact
#define yyr1 c_r1
#define yyr2 c_r2
#define yydef c_def
#define yychk c_chk
#define yypgo c_pgo
#define yyact c_act
#define yyexca c_exca
#define yyerrflag c_errflag
#define yynerrs c_nerrs
#define yyps c_ps
#define yypv c_pv
#define yys c_s
#define yy_yys c_yys
#define yystate c_state
#define yytmp c_tmp
#define yyv c_v
#define yy_yyv c_yyv
#define yyval c_val
#define yylloc c_lloc
#define yyreds c_reds /* With YYDEBUG defined */
#define yytoks c_toks /* With YYDEBUG defined */
#define yyname c_name /* With YYDEBUG defined */
#define yyrule c_rule /* With YYDEBUG defined */
#define yylhs c_yylhs
#define yylen c_yylen
#define yydefred c_yydefred
#define yydgoto c_yydgoto
#define yysindex c_yysindex
#define yyrindex c_yyrindex
#define yygindex c_yygindex
#define yytable c_yytable
#define yycheck c_yycheck
#ifndef YYDEBUG
#define YYDEBUG 1 /* Default to yydebug support */
#endif
#define YYFPRINTF parser_fprintf
int yyparse (void);
static int yylex (void);
void yyerror (char *);
%}
/* Although the yacc "value" of an expression is not used,
since the result is stored in the structure being created,
other node types do have values. */
%union
{
LONGEST lval;
struct {
LONGEST val;
struct type *type;
} typed_val_int;
struct {
DOUBLEST dval;
struct type *type;
} typed_val_float;
struct {
gdb_byte val[16];
struct type *type;
} typed_val_decfloat;
struct symbol *sym;
struct type *tval;
struct stoken sval;
struct typed_stoken tsval;
struct ttype tsym;
struct symtoken ssym;
int voidval;
struct block *bval;
enum exp_opcode opcode;
struct internalvar *ivar;
struct stoken_vector svec;
struct type **tvec;
int *ivec;
}
%{
/* YYSTYPE gets defined by %union */
static int parse_number (char *, int, int, YYSTYPE *);
%}
%type <voidval> exp exp1 type_exp start variable qualified_name lcurly
%type <lval> rcurly
%type <tval> type typebase qualified_type
%type <tvec> nonempty_typelist
/* %type <bval> block */
/* Fancy type parsing. */
%type <voidval> func_mod direct_abs_decl abs_decl
%type <tval> ptype
%type <lval> array_mod
%token <typed_val_int> INT
%token <typed_val_float> FLOAT
%token <typed_val_decfloat> DECFLOAT
/* Both NAME and TYPENAME tokens represent symbols in the input,
and both convey their data as strings.
But a TYPENAME is a string that happens to be defined as a typedef
or builtin type name (such as int or char)
and a NAME is any other symbol.
Contexts where this distinction is not important can use the
nonterminal "name", which matches either NAME or TYPENAME. */
%token <tsval> STRING
%token <tsval> CHAR
%token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
%token <voidval> COMPLETE
%token <tsym> TYPENAME
%type <sval> name
%type <svec> string_exp
%type <ssym> name_not_typename
%type <tsym> typename
/* A NAME_OR_INT is a symbol which is not known in the symbol table,
but which would parse as a valid number in the current input radix.
E.g. "c" when input_radix==16. Depending on the parse, it will be
turned into a name or into a number. */
%token <ssym> NAME_OR_INT
%token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
%token TEMPLATE
%token ERROR
/* Special type cases, put in to allow the parser to distinguish different
legal basetypes. */
%token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
%token <voidval> VARIABLE
%token <opcode> ASSIGN_MODIFY
/* C++ */
%token TRUEKEYWORD
%token FALSEKEYWORD
%left ','
%left ABOVE_COMMA
%right '=' ASSIGN_MODIFY
%right '?'
%left OROR
%left ANDAND
%left '|'
%left '^'
%left '&'
%left EQUAL NOTEQUAL
%left '<' '>' LEQ GEQ
%left LSH RSH
%left '@'
%left '+' '-'
%left '*' '/' '%'
%right UNARY INCREMENT DECREMENT
%right ARROW ARROW_STAR '.' DOT_STAR '[' '('
%token <ssym> BLOCKNAME
%token <bval> FILENAME
%type <bval> block
%left COLONCOLON
%%
start : exp1
| type_exp
;
type_exp: type
{ write_exp_elt_opcode(OP_TYPE);
write_exp_elt_type($1);
write_exp_elt_opcode(OP_TYPE);}
;
/* Expressions, including the comma operator. */
exp1 : exp
| exp1 ',' exp
{ write_exp_elt_opcode (BINOP_COMMA); }
;
/* Expressions, not including the comma operator. */
exp : '*' exp %prec UNARY
{ write_exp_elt_opcode (UNOP_IND); }
;
exp : '&' exp %prec UNARY
{ write_exp_elt_opcode (UNOP_ADDR); }
;
exp : '-' exp %prec UNARY
{ write_exp_elt_opcode (UNOP_NEG); }
;
exp : '+' exp %prec UNARY
{ write_exp_elt_opcode (UNOP_PLUS); }
;
exp : '!' exp %prec UNARY
{ write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
;
exp : '~' exp %prec UNARY
{ write_exp_elt_opcode (UNOP_COMPLEMENT); }
;
exp : INCREMENT exp %prec UNARY
{ write_exp_elt_opcode (UNOP_PREINCREMENT); }
;
exp : DECREMENT exp %prec UNARY
{ write_exp_elt_opcode (UNOP_PREDECREMENT); }
;
exp : exp INCREMENT %prec UNARY
{ write_exp_elt_opcode (UNOP_POSTINCREMENT); }
;
exp : exp DECREMENT %prec UNARY
{ write_exp_elt_opcode (UNOP_POSTDECREMENT); }
;
exp : SIZEOF exp %prec UNARY
{ write_exp_elt_opcode (UNOP_SIZEOF); }
;
exp : exp ARROW name
{ write_exp_elt_opcode (STRUCTOP_PTR);
write_exp_string ($3);
write_exp_elt_opcode (STRUCTOP_PTR); }
;
exp : exp ARROW name COMPLETE
{ mark_struct_expression ();
write_exp_elt_opcode (STRUCTOP_PTR);
write_exp_string ($3);
write_exp_elt_opcode (STRUCTOP_PTR); }
;
exp : exp ARROW COMPLETE
{ struct stoken s;
mark_struct_expression ();
write_exp_elt_opcode (STRUCTOP_PTR);
s.ptr = "";
s.length = 0;
write_exp_string (s);
write_exp_elt_opcode (STRUCTOP_PTR); }
;
exp : exp ARROW qualified_name
{ /* exp->type::name becomes exp->*(&type::name) */
/* Note: this doesn't work if name is a
static member! FIXME */
write_exp_elt_opcode (UNOP_ADDR);
write_exp_elt_opcode (STRUCTOP_MPTR); }
;
exp : exp ARROW_STAR exp
{ write_exp_elt_opcode (STRUCTOP_MPTR); }
;
exp : exp '.' name
{ write_exp_elt_opcode (STRUCTOP_STRUCT);
write_exp_string ($3);
write_exp_elt_opcode (STRUCTOP_STRUCT); }
;
exp : exp '.' name COMPLETE
{ mark_struct_expression ();
write_exp_elt_opcode (STRUCTOP_STRUCT);
write_exp_string ($3);
write_exp_elt_opcode (STRUCTOP_STRUCT); }
;
exp : exp '.' COMPLETE
{ struct stoken s;
mark_struct_expression ();
write_exp_elt_opcode (STRUCTOP_STRUCT);
s.ptr = "";
s.length = 0;
write_exp_string (s);
write_exp_elt_opcode (STRUCTOP_STRUCT); }
;
exp : exp '.' qualified_name
{ /* exp.type::name becomes exp.*(&type::name) */
/* Note: this doesn't work if name is a
static member! FIXME */
write_exp_elt_opcode (UNOP_ADDR);
write_exp_elt_opcode (STRUCTOP_MEMBER); }
;
exp : exp DOT_STAR exp
{ write_exp_elt_opcode (STRUCTOP_MEMBER); }
;
exp : exp '[' exp1 ']'
{ write_exp_elt_opcode (BINOP_SUBSCRIPT); }
;
exp : exp '('
/* This is to save the value of arglist_len
being accumulated by an outer function call. */
{ start_arglist (); }
arglist ')' %prec ARROW
{ write_exp_elt_opcode (OP_FUNCALL);
write_exp_elt_longcst ((LONGEST) end_arglist ());
write_exp_elt_opcode (OP_FUNCALL); }
;
lcurly : '{'
{ start_arglist (); }
;
arglist :
;
arglist : exp
{ arglist_len = 1; }
;
arglist : arglist ',' exp %prec ABOVE_COMMA
{ arglist_len++; }
;
rcurly : '}'
{ $$ = end_arglist () - 1; }
;
exp : lcurly arglist rcurly %prec ARROW
{ write_exp_elt_opcode (OP_ARRAY);
write_exp_elt_longcst ((LONGEST) 0);
write_exp_elt_longcst ((LONGEST) $3);
write_exp_elt_opcode (OP_ARRAY); }
;
exp : lcurly type rcurly exp %prec UNARY
{ write_exp_elt_opcode (UNOP_MEMVAL);
write_exp_elt_type ($2);
write_exp_elt_opcode (UNOP_MEMVAL); }
;
exp : '(' type ')' exp %prec UNARY
{ write_exp_elt_opcode (UNOP_CAST);
write_exp_elt_type ($2);
write_exp_elt_opcode (UNOP_CAST); }
;
exp : '(' exp1 ')'
{ }
;
/* Binary operators in order of decreasing precedence. */
exp : exp '@' exp
{ write_exp_elt_opcode (BINOP_REPEAT); }
;
exp : exp '*' exp
{ write_exp_elt_opcode (BINOP_MUL); }
;
exp : exp '/' exp
{ write_exp_elt_opcode (BINOP_DIV); }
;
exp : exp '%' exp
{ write_exp_elt_opcode (BINOP_REM); }
;
exp : exp '+' exp
{ write_exp_elt_opcode (BINOP_ADD); }
;
exp : exp '-' exp
{ write_exp_elt_opcode (BINOP_SUB); }
;
exp : exp LSH exp
{ write_exp_elt_opcode (BINOP_LSH); }
;
exp : exp RSH exp
{ write_exp_elt_opcode (BINOP_RSH); }
;
exp : exp EQUAL exp
{ write_exp_elt_opcode (BINOP_EQUAL); }
;
exp : exp NOTEQUAL exp
{ write_exp_elt_opcode (BINOP_NOTEQUAL); }
;
exp : exp LEQ exp
{ write_exp_elt_opcode (BINOP_LEQ); }
;
exp : exp GEQ exp
{ write_exp_elt_opcode (BINOP_GEQ); }
;
exp : exp '<' exp
{ write_exp_elt_opcode (BINOP_LESS); }
;
exp : exp '>' exp
{ write_exp_elt_opcode (BINOP_GTR); }
;
exp : exp '&' exp
{ write_exp_elt_opcode (BINOP_BITWISE_AND); }
;
exp : exp '^' exp
{ write_exp_elt_opcode (BINOP_BITWISE_XOR); }
;
exp : exp '|' exp
{ write_exp_elt_opcode (BINOP_BITWISE_IOR); }
;
exp : exp ANDAND exp
{ write_exp_elt_opcode (BINOP_LOGICAL_AND); }
;
exp : exp OROR exp
{ write_exp_elt_opcode (BINOP_LOGICAL_OR); }
;
exp : exp '?' exp ':' exp %prec '?'
{ write_exp_elt_opcode (TERNOP_COND); }
;
exp : exp '=' exp
{ write_exp_elt_opcode (BINOP_ASSIGN); }
;
exp : exp ASSIGN_MODIFY exp
{ write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
write_exp_elt_opcode ($2);
write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
;
exp : INT
{ write_exp_elt_opcode (OP_LONG);
write_exp_elt_type ($1.type);
write_exp_elt_longcst ((LONGEST)($1.val));
write_exp_elt_opcode (OP_LONG); }
;
exp : CHAR
{
struct stoken_vector vec;
vec.len = 1;
vec.tokens = &$1;
write_exp_string_vector ($1.type, &vec);
}
;
exp : NAME_OR_INT
{ YYSTYPE val;
parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
write_exp_elt_opcode (OP_LONG);
write_exp_elt_type (val.typed_val_int.type);
write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
write_exp_elt_opcode (OP_LONG);
}
;
exp : FLOAT
{ write_exp_elt_opcode (OP_DOUBLE);
write_exp_elt_type ($1.type);
write_exp_elt_dblcst ($1.dval);
write_exp_elt_opcode (OP_DOUBLE); }
;
exp : DECFLOAT
{ write_exp_elt_opcode (OP_DECFLOAT);
write_exp_elt_type ($1.type);
write_exp_elt_decfloatcst ($1.val);
write_exp_elt_opcode (OP_DECFLOAT); }
;
exp : variable
;
exp : VARIABLE
/* Already written by write_dollar_variable. */
;
exp : SIZEOF '(' type ')' %prec UNARY
{ write_exp_elt_opcode (OP_LONG);
write_exp_elt_type (parse_type->builtin_int);
CHECK_TYPEDEF ($3);
write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
write_exp_elt_opcode (OP_LONG); }
;
string_exp:
STRING
{
/* We copy the string here, and not in the
lexer, to guarantee that we do not leak a
string. Note that we follow the
NUL-termination convention of the
lexer. */
struct typed_stoken *vec = XNEW (struct typed_stoken);
$$.len = 1;
$$.tokens = vec;
vec->type = $1.type;
vec->length = $1.length;
vec->ptr = malloc ($1.length + 1);
memcpy (vec->ptr, $1.ptr, $1.length + 1);
}
| string_exp STRING
{
/* Note that we NUL-terminate here, but just
for convenience. */
char *p;
++$$.len;
$$.tokens = realloc ($$.tokens,
$$.len * sizeof (struct typed_stoken));
p = malloc ($2.length + 1);
memcpy (p, $2.ptr, $2.length + 1);
$$.tokens[$$.len - 1].type = $2.type;
$$.tokens[$$.len - 1].length = $2.length;
$$.tokens[$$.len - 1].ptr = p;
}
;
exp : string_exp
{
int i;
enum c_string_type type = C_STRING;
for (i = 0; i < $1.len; ++i)
{
switch ($1.tokens[i].type)
{
case C_STRING:
break;
case C_WIDE_STRING:
case C_STRING_16:
case C_STRING_32:
if (type != C_STRING
&& type != $1.tokens[i].type)
error ("Undefined string concatenation.");
type = $1.tokens[i].type;
break;
default:
/* internal error */
internal_error (__FILE__, __LINE__,
"unrecognized type in string concatenation");
}
}
write_exp_string_vector (type, &$1);
for (i = 0; i < $1.len; ++i)
free ($1.tokens[i].ptr);
free ($1.tokens);
}
;
/* C++. */
exp : TRUEKEYWORD
{ write_exp_elt_opcode (OP_LONG);
write_exp_elt_type (parse_type->builtin_bool);
write_exp_elt_longcst ((LONGEST) 1);
write_exp_elt_opcode (OP_LONG); }
;
exp : FALSEKEYWORD
{ write_exp_elt_opcode (OP_LONG);
write_exp_elt_type (parse_type->builtin_bool);
write_exp_elt_longcst ((LONGEST) 0);
write_exp_elt_opcode (OP_LONG); }
;
/* end of C++. */
block : BLOCKNAME
{
if ($1.sym)
$$ = SYMBOL_BLOCK_VALUE ($1.sym);
else
error ("No file or function \"%s\".",
copy_name ($1.stoken));
}
| FILENAME
{
$$ = $1;
}
;
block : block COLONCOLON name
{ struct symbol *tem
= lookup_symbol (copy_name ($3), $1,
VAR_DOMAIN, (int *) NULL);
if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
error ("No function \"%s\" in specified context.",
copy_name ($3));
$$ = SYMBOL_BLOCK_VALUE (tem); }
;
variable: block COLONCOLON name
{ struct symbol *sym;
sym = lookup_symbol (copy_name ($3), $1,
VAR_DOMAIN, (int *) NULL);
if (sym == 0)
error ("No symbol \"%s\" in specified context.",
copy_name ($3));
write_exp_elt_opcode (OP_VAR_VALUE);
/* block_found is set by lookup_symbol. */
write_exp_elt_block (block_found);
write_exp_elt_sym (sym);
write_exp_elt_opcode (OP_VAR_VALUE); }
;
qualified_name: typebase COLONCOLON name
{
struct type *type = $1;
CHECK_TYPEDEF (type);
if (TYPE_CODE (type) != TYPE_CODE_STRUCT
&& TYPE_CODE (type) != TYPE_CODE_UNION
&& TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
error ("`%s' is not defined as an aggregate type.",
TYPE_NAME (type));
write_exp_elt_opcode (OP_SCOPE);
write_exp_elt_type (type);
write_exp_string ($3);
write_exp_elt_opcode (OP_SCOPE);
}
| typebase COLONCOLON '~' name
{
struct type *type = $1;
struct stoken tmp_token;
CHECK_TYPEDEF (type);
if (TYPE_CODE (type) != TYPE_CODE_STRUCT
&& TYPE_CODE (type) != TYPE_CODE_UNION
&& TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
error ("`%s' is not defined as an aggregate type.",
TYPE_NAME (type));
tmp_token.ptr = (char*) alloca ($4.length + 2);
tmp_token.length = $4.length + 1;
tmp_token.ptr[0] = '~';
memcpy (tmp_token.ptr+1, $4.ptr, $4.length);
tmp_token.ptr[tmp_token.length] = 0;
/* Check for valid destructor name. */
destructor_name_p (tmp_token.ptr, type);
write_exp_elt_opcode (OP_SCOPE);
write_exp_elt_type (type);
write_exp_string (tmp_token);
write_exp_elt_opcode (OP_SCOPE);
}
;
variable: qualified_name
| COLONCOLON name
{
char *name = copy_name ($2);
struct symbol *sym;
struct minimal_symbol *msymbol;
sym =
lookup_symbol (name, (const struct block *) NULL,
VAR_DOMAIN, (int *) NULL);
if (sym)
{
write_exp_elt_opcode (OP_VAR_VALUE);
write_exp_elt_block (NULL);
write_exp_elt_sym (sym);
write_exp_elt_opcode (OP_VAR_VALUE);
break;
}
msymbol = lookup_minimal_symbol (name, NULL, NULL);
if (msymbol != NULL)
write_exp_msymbol (msymbol);
else if (!have_full_symbols () && !have_partial_symbols ())
error ("No symbol table is loaded. Use the \"file\" command.");
else
error ("No symbol \"%s\" in current context.", name);
}
;
variable: name_not_typename
{ struct symbol *sym = $1.sym;
if (sym)
{
if (symbol_read_needs_frame (sym))
{
if (innermost_block == 0 ||
contained_in (block_found,
innermost_block))
innermost_block = block_found;
}
write_exp_elt_opcode (OP_VAR_VALUE);
/* We want to use the selected frame, not
another more inner frame which happens to
be in the same block. */
write_exp_elt_block (NULL);
write_exp_elt_sym (sym);
write_exp_elt_opcode (OP_VAR_VALUE);
}
else if ($1.is_a_field_of_this)
{
/* C++: it hangs off of `this'. Must
not inadvertently convert from a method call
to data ref. */
if (innermost_block == 0 ||
contained_in (block_found, innermost_block))
innermost_block = block_found;
write_exp_elt_opcode (OP_THIS);
write_exp_elt_opcode (OP_THIS);
write_exp_elt_opcode (STRUCTOP_PTR);
write_exp_string ($1.stoken);
write_exp_elt_opcode (STRUCTOP_PTR);
}
else
{
struct minimal_symbol *msymbol;
char *arg = copy_name ($1.stoken);
msymbol =
lookup_minimal_symbol (arg, NULL, NULL);
if (msymbol != NULL)
write_exp_msymbol (msymbol);
else if (!have_full_symbols () && !have_partial_symbols ())
error ("No symbol table is loaded. Use the \"file\" command.");
else
error ("No symbol \"%s\" in current context.",
copy_name ($1.stoken));
}
}
;
space_identifier : '@' NAME
{ push_type_address_space (copy_name ($2.stoken));
push_type (tp_space_identifier);
}
;
const_or_volatile: const_or_volatile_noopt
|
;
cv_with_space_id : const_or_volatile space_identifier const_or_volatile
;
const_or_volatile_or_space_identifier_noopt: cv_with_space_id
| const_or_volatile_noopt
;
const_or_volatile_or_space_identifier:
const_or_volatile_or_space_identifier_noopt
|
;
abs_decl: '*'
{ push_type (tp_pointer); $$ = 0; }
| '*' abs_decl
{ push_type (tp_pointer); $$ = $2; }
| '&'
{ push_type (tp_reference); $$ = 0; }
| '&' abs_decl
{ push_type (tp_reference); $$ = $2; }
| direct_abs_decl
;
direct_abs_decl: '(' abs_decl ')'
{ $$ = $2; }
| direct_abs_decl array_mod
{
push_type_int ($2);
push_type (tp_array);
}
| array_mod
{
push_type_int ($1);
push_type (tp_array);
$$ = 0;
}
| direct_abs_decl func_mod
{ push_type (tp_function); }
| func_mod
{ push_type (tp_function); }
;
array_mod: '[' ']'
{ $$ = -1; }
| '[' INT ']'
{ $$ = $2.val; }
;
func_mod: '(' ')'
{ $$ = 0; }
| '(' nonempty_typelist ')'
{ free ($2); $$ = 0; }
;
/* We used to try to recognize pointer to member types here, but
that didn't work (shift/reduce conflicts meant that these rules never
got executed). The problem is that
int (foo::bar::baz::bizzle)
is a function type but
int (foo::bar::baz::bizzle::*)
is a pointer to member type. Stroustrup loses again! */
type : ptype
;
typebase /* Implements (approximately): (type-qualifier)* type-specifier */
: TYPENAME
{ $$ = $1.type; }
| INT_KEYWORD
{ $$ = parse_type->builtin_int; }
| LONG
{ $$ = parse_type->builtin_long; }
| SHORT
{ $$ = parse_type->builtin_short; }
| LONG INT_KEYWORD
{ $$ = parse_type->builtin_long; }
| LONG SIGNED_KEYWORD INT_KEYWORD
{ $$ = parse_type->builtin_long; }
| LONG SIGNED_KEYWORD
{ $$ = parse_type->builtin_long; }
| SIGNED_KEYWORD LONG INT_KEYWORD
{ $$ = parse_type->builtin_long; }
| UNSIGNED LONG INT_KEYWORD
{ $$ = parse_type->builtin_unsigned_long; }
| LONG UNSIGNED INT_KEYWORD
{ $$ = parse_type->builtin_unsigned_long; }
| LONG UNSIGNED
{ $$ = parse_type->builtin_unsigned_long; }
| LONG LONG
{ $$ = parse_type->builtin_long_long; }
| LONG LONG INT_KEYWORD
{ $$ = parse_type->builtin_long_long; }
| LONG LONG SIGNED_KEYWORD INT_KEYWORD
{ $$ = parse_type->builtin_long_long; }
| LONG LONG SIGNED_KEYWORD
{ $$ = parse_type->builtin_long_long; }
| SIGNED_KEYWORD LONG LONG
{ $$ = parse_type->builtin_long_long; }
| SIGNED_KEYWORD LONG LONG INT_KEYWORD
{ $$ = parse_type->builtin_long_long; }
| UNSIGNED LONG LONG
{ $$ = parse_type->builtin_unsigned_long_long; }
| UNSIGNED LONG LONG INT_KEYWORD
{ $$ = parse_type->builtin_unsigned_long_long; }
| LONG LONG UNSIGNED
{ $$ = parse_type->builtin_unsigned_long_long; }
| LONG LONG UNSIGNED INT_KEYWORD
{ $$ = parse_type->builtin_unsigned_long_long; }
| SHORT INT_KEYWORD
{ $$ = parse_type->builtin_short; }
| SHORT SIGNED_KEYWORD INT_KEYWORD
{ $$ = parse_type->builtin_short; }
| SHORT SIGNED_KEYWORD
{ $$ = parse_type->builtin_short; }
| UNSIGNED SHORT INT_KEYWORD
{ $$ = parse_type->builtin_unsigned_short; }
| SHORT UNSIGNED
{ $$ = parse_type->builtin_unsigned_short; }
| SHORT UNSIGNED INT_KEYWORD
{ $$ = parse_type->builtin_unsigned_short; }
| DOUBLE_KEYWORD
{ $$ = parse_type->builtin_double; }
| LONG DOUBLE_KEYWORD
{ $$ = parse_type->builtin_long_double; }
| STRUCT name
{ $$ = lookup_struct (copy_name ($2),
expression_context_block); }
| CLASS name
{ $$ = lookup_struct (copy_name ($2),
expression_context_block); }
| UNION name
{ $$ = lookup_union (copy_name ($2),
expression_context_block); }
| ENUM name
{ $$ = lookup_enum (copy_name ($2),
expression_context_block); }
| UNSIGNED typename
{ $$ = lookup_unsigned_typename (parse_language,
parse_gdbarch,
TYPE_NAME($2.type)); }
| UNSIGNED
{ $$ = parse_type->builtin_unsigned_int; }
| SIGNED_KEYWORD typename
{ $$ = lookup_signed_typename (parse_language,
parse_gdbarch,
TYPE_NAME($2.type)); }
| SIGNED_KEYWORD
{ $$ = parse_type->builtin_int; }
/* It appears that this rule for templates is never
reduced; template recognition happens by lookahead
in the token processing code in yylex. */
| TEMPLATE name '<' type '>'
{ $$ = lookup_template_type(copy_name($2), $4,
expression_context_block);
}
| const_or_volatile_or_space_identifier_noopt typebase
{ $$ = follow_types ($2); }
| typebase const_or_volatile_or_space_identifier_noopt
{ $$ = follow_types ($1); }
| qualified_type
;
/* FIXME: carlton/2003-09-25: This next bit leads to lots of
reduce-reduce conflicts, because the parser doesn't know whether or
not to use qualified_name or qualified_type: the rules are
identical. If the parser is parsing 'A::B::x', then, when it sees
the second '::', it knows that the expression to the left of it has
to be a type, so it uses qualified_type. But if it is parsing just
'A::B', then it doesn't have any way of knowing which rule to use,
so there's a reduce-reduce conflict; it picks qualified_name, since
that occurs earlier in this file than qualified_type.
There's no good way to fix this with the grammar as it stands; as
far as I can tell, some of the problems arise from ambiguities that
GDB introduces ('start' can be either an expression or a type), but
some of it is inherent to the nature of C++ (you want to treat the
input "(FOO)" fairly differently depending on whether FOO is an
expression or a type, and if FOO is a complex expression, this can
be hard to determine at the right time). Fortunately, it works
pretty well in most cases. For example, if you do 'ptype A::B',
where A::B is a nested type, then the parser will mistakenly
misidentify it as an expression; but evaluate_subexp will get
called with 'noside' set to EVAL_AVOID_SIDE_EFFECTS, and everything
will work out anyways. But there are situations where the parser
will get confused: the most common one that I've run into is when
you want to do
print *((A::B *) x)"
where the parser doesn't realize that A::B has to be a type until
it hits the first right paren, at which point it's too late. (The
workaround is to type "print *(('A::B' *) x)" instead.) (And
another solution is to fix our symbol-handling code so that the
user never wants to type something like that in the first place,
because we get all the types right without the user's help!)
Perhaps we could fix this by making the lexer smarter. Some of
this functionality used to be in the lexer, but in a way that
worked even less well than the current solution: that attempt
involved having the parser sometimes handle '::' and having the
lexer sometimes handle it, and without a clear division of
responsibility, it quickly degenerated into a big mess. Probably
the eventual correct solution will give more of a role to the lexer
(ideally via code that is shared between the lexer and
decode_line_1), but I'm not holding my breath waiting for somebody
to get around to cleaning this up... */
qualified_type: typebase COLONCOLON name
{
struct type *type = $1;
struct type *new_type;
char *ncopy = alloca ($3.length + 1);
memcpy (ncopy, $3.ptr, $3.length);
ncopy[$3.length] = '\0';
if (TYPE_CODE (type) != TYPE_CODE_STRUCT
&& TYPE_CODE (type) != TYPE_CODE_UNION
&& TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
error ("`%s' is not defined as an aggregate type.",
TYPE_NAME (type));
new_type = cp_lookup_nested_type (type, ncopy,
expression_context_block);
if (new_type == NULL)
error ("No type \"%s\" within class or namespace \"%s\".",
ncopy, TYPE_NAME (type));
$$ = new_type;
}
;
typename: TYPENAME
| INT_KEYWORD
{
$$.stoken.ptr = "int";
$$.stoken.length = 3;
$$.type = parse_type->builtin_int;
}
| LONG
{
$$.stoken.ptr = "long";
$$.stoken.length = 4;
$$.type = parse_type->builtin_long;
}
| SHORT
{
$$.stoken.ptr = "short";
$$.stoken.length = 5;
$$.type = parse_type->builtin_short;
}
;
nonempty_typelist
: type
{ $$ = (struct type **) malloc (sizeof (struct type *) * 2);
$<ivec>$[0] = 1; /* Number of types in vector */
$$[1] = $1;
}
| nonempty_typelist ',' type
{ int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
$$ = (struct type **) realloc ((char *) $1, len);
$$[$<ivec>$[0]] = $3;
}
;
ptype : typebase
| ptype const_or_volatile_or_space_identifier abs_decl const_or_volatile_or_space_identifier
{ $$ = follow_types ($1); }
;
const_and_volatile: CONST_KEYWORD VOLATILE_KEYWORD
| VOLATILE_KEYWORD CONST_KEYWORD
;
const_or_volatile_noopt: const_and_volatile
{ push_type (tp_const);
push_type (tp_volatile);
}
| CONST_KEYWORD
{ push_type (tp_const); }
| VOLATILE_KEYWORD
{ push_type (tp_volatile); }
;
name : NAME { $$ = $1.stoken; }
| BLOCKNAME { $$ = $1.stoken; }
| TYPENAME { $$ = $1.stoken; }
| NAME_OR_INT { $$ = $1.stoken; }
;
name_not_typename : NAME
| BLOCKNAME
/* These would be useful if name_not_typename was useful, but it is just
a fake for "variable", so these cause reduce/reduce conflicts because
the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
=exp) or just an exp. If name_not_typename was ever used in an lvalue
context where only a name could occur, this might be useful.
| NAME_OR_INT
*/
;
%%
/* Take care of parsing a number (anything that starts with a digit).
Set yylval and return the token type; update lexptr.
LEN is the number of characters in it. */
/*** Needs some error checking for the float case ***/
static int
parse_number (char *p, int len, int parsed_float, YYSTYPE *putithere)
{
/* FIXME: Shouldn't these be unsigned? We don't deal with negative values
here, and we do kind of silly things like cast to unsigned. */
LONGEST n = 0;
LONGEST prevn = 0;
ULONGEST un;
int i = 0;
int c;
int base = input_radix;
int unsigned_p = 0;
/* Number of "L" suffixes encountered. */
int long_p = 0;
/* We have found a "L" or "U" suffix. */
int found_suffix = 0;
ULONGEST high_bit;
struct type *signed_type;
struct type *unsigned_type;
if (parsed_float)
{
/* It's a float since it contains a point or an exponent. */
char *s;
int num; /* number of tokens scanned by scanf */
char saved_char;
/* If it ends at "df", "dd" or "dl", take it as type of decimal floating
point. Return DECFLOAT. */
if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'f')
{
p[len - 2] = '\0';
putithere->typed_val_decfloat.type
= parse_type->builtin_decfloat;
decimal_from_string (putithere->typed_val_decfloat.val, 4,
gdbarch_byte_order (parse_gdbarch), p);
p[len - 2] = 'd';
return DECFLOAT;
}
if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'd')
{
p[len - 2] = '\0';
putithere->typed_val_decfloat.type
= parse_type->builtin_decdouble;
decimal_from_string (putithere->typed_val_decfloat.val, 8,
gdbarch_byte_order (parse_gdbarch), p);
p[len - 2] = 'd';
return DECFLOAT;
}
if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'l')
{
p[len - 2] = '\0';
putithere->typed_val_decfloat.type
= parse_type->builtin_declong;
decimal_from_string (putithere->typed_val_decfloat.val, 16,
gdbarch_byte_order (parse_gdbarch), p);
p[len - 2] = 'd';
return DECFLOAT;
}
s = malloc (len);
saved_char = p[len];
p[len] = 0; /* null-terminate the token */
num = sscanf (p, "%" DOUBLEST_SCAN_FORMAT "%s",
&putithere->typed_val_float.dval, s);
p[len] = saved_char; /* restore the input stream */
if (num == 1)
putithere->typed_val_float.type =
parse_type->builtin_double;
if (num == 2 )
{
/* See if it has any float suffix: 'f' for float, 'l' for long
double. */
if (!strcasecmp (s, "f"))
putithere->typed_val_float.type =
parse_type->builtin_float;
else if (!strcasecmp (s, "l"))
putithere->typed_val_float.type =
parse_type->builtin_long_double;
else
{
free (s);
return ERROR;
}
}
free (s);
return FLOAT;
}
/* Handle base-switching prefixes 0x, 0t, 0d, 0 */
if (p[0] == '0')
switch (p[1])
{
case 'x':
case 'X':
if (len >= 3)
{
p += 2;
base = 16;
len -= 2;
}
break;
case 't':
case 'T':
case 'd':
case 'D':
if (len >= 3)
{
p += 2;
base = 10;
len -= 2;
}
break;
default:
base = 8;
break;
}
while (len-- > 0)
{
c = *p++;
if (c >= 'A' && c <= 'Z')
c += 'a' - 'A';
if (c != 'l' && c != 'u')
n *= base;
if (c >= '0' && c <= '9')
{
if (found_suffix)
return ERROR;
n += i = c - '0';
}
else
{
if (base > 10 && c >= 'a' && c <= 'f')
{
if (found_suffix)
return ERROR;
n += i = c - 'a' + 10;
}
else if (c == 'l')
{
++long_p;
found_suffix = 1;
}
else if (c == 'u')
{
unsigned_p = 1;
found_suffix = 1;
}
else
return ERROR; /* Char not a digit */
}
if (i >= base)
return ERROR; /* Invalid digit in this base */
/* Portably test for overflow (only works for nonzero values, so make
a second check for zero). FIXME: Can't we just make n and prevn
unsigned and avoid this? */
if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
unsigned_p = 1; /* Try something unsigned */
/* Portably test for unsigned overflow.
FIXME: This check is wrong; for example it doesn't find overflow
on 0x123456789 when LONGEST is 32 bits. */
if (c != 'l' && c != 'u' && n != 0)
{
if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
error ("Numeric constant too large.");
}
prevn = n;
}
/* An integer constant is an int, a long, or a long long. An L
suffix forces it to be long; an LL suffix forces it to be long
long. If not forced to a larger size, it gets the first type of
the above that it fits in. To figure out whether it fits, we
shift it right and see whether anything remains. Note that we
can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
operation, because many compilers will warn about such a shift
(which always produces a zero result). Sometimes gdbarch_int_bit
or gdbarch_long_bit will be that big, sometimes not. To deal with
the case where it is we just always shift the value more than
once, with fewer bits each time. */
un = (ULONGEST)n >> 2;
if (long_p == 0
&& (un >> (gdbarch_int_bit (parse_gdbarch) - 2)) == 0)
{
high_bit = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch) - 1);
/* A large decimal (not hex or octal) constant (between INT_MAX
and UINT_MAX) is a long or unsigned long, according to ANSI,
never an unsigned int, but this code treats it as unsigned
int. This probably should be fixed. GCC gives a warning on
such constants. */
unsigned_type = parse_type->builtin_unsigned_int;
signed_type = parse_type->builtin_int;
}
else if (long_p <= 1
&& (un >> (gdbarch_long_bit (parse_gdbarch) - 2)) == 0)
{
high_bit = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch) - 1);
unsigned_type = parse_type->builtin_unsigned_long;
signed_type = parse_type->builtin_long;
}
else
{
int shift;
if (sizeof (ULONGEST) * HOST_CHAR_BIT
< gdbarch_long_long_bit (parse_gdbarch))
/* A long long does not fit in a LONGEST. */
shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
else
shift = (gdbarch_long_long_bit (parse_gdbarch) - 1);
high_bit = (ULONGEST) 1 << shift;
unsigned_type = parse_type->builtin_unsigned_long_long;
signed_type = parse_type->builtin_long_long;
}
putithere->typed_val_int.val = n;
/* If the high bit of the worked out type is set then this number
has to be unsigned. */
if (unsigned_p || (n & high_bit))
{
putithere->typed_val_int.type = unsigned_type;
}
else
{
putithere->typed_val_int.type = signed_type;
}
return INT;
}
/* Temporary obstack used for holding strings. */
static struct obstack tempbuf;
static int tempbuf_init;
/* Parse a C escape sequence. The initial backslash of the sequence
is at (*PTR)[-1]. *PTR will be updated to point to just after the
last character of the sequence. If OUTPUT is not NULL, the
translated form of the escape sequence will be written there. If
OUTPUT is NULL, no output is written and the call will only affect
*PTR. If an escape sequence is expressed in target bytes, then the
entire sequence will simply be copied to OUTPUT. Return 1 if any
character was emitted, 0 otherwise. */
int
c_parse_escape (char **ptr, struct obstack *output)
{
char *tokptr = *ptr;
int result = 1;
/* Some escape sequences undergo character set conversion. Those we
translate here. */
switch (*tokptr)
{
/* Hex escapes do not undergo character set conversion, so keep
the escape sequence for later. */
case 'x':
if (output)
obstack_grow_str (output, "\\x");
++tokptr;
if (!isxdigit (*tokptr))
error (_("\\x escape without a following hex digit"));
while (isxdigit (*tokptr))
{
if (output)
obstack_1grow (output, *tokptr);
++tokptr;
}
break;
/* Octal escapes do not undergo character set conversion, so
keep the escape sequence for later. */
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
{
int i;
if (output)
obstack_grow_str (output, "\\");
for (i = 0;
i < 3 && isdigit (*tokptr) && *tokptr != '8' && *tokptr != '9';
++i)
{
if (output)
obstack_1grow (output, *tokptr);
++tokptr;
}
}
break;
/* We handle UCNs later. We could handle them here, but that
would mean a spurious error in the case where the UCN could
be converted to the target charset but not the host
charset. */
case 'u':
case 'U':
{
char c = *tokptr;
int i, len = c == 'U' ? 8 : 4;
if (output)
{
obstack_1grow (output, '\\');
obstack_1grow (output, *tokptr);
}
++tokptr;
if (!isxdigit (*tokptr))
error (_("\\%c escape without a following hex digit"), c);
for (i = 0; i < len && isxdigit (*tokptr); ++i)
{
if (output)
obstack_1grow (output, *tokptr);
++tokptr;
}
}
break;
/* We must pass backslash through so that it does not
cause quoting during the second expansion. */
case '\\':
if (output)
obstack_grow_str (output, "\\\\");
++tokptr;
break;
/* Escapes which undergo conversion. */
case 'a':
if (output)
obstack_1grow (output, '\a');
++tokptr;
break;
case 'b':
if (output)
obstack_1grow (output, '\b');
++tokptr;
break;
case 'f':
if (output)
obstack_1grow (output, '\f');
++tokptr;
break;
case 'n':
if (output)
obstack_1grow (output, '\n');
++tokptr;
break;
case 'r':
if (output)
obstack_1grow (output, '\r');
++tokptr;
break;
case 't':
if (output)
obstack_1grow (output, '\t');
++tokptr;
break;
case 'v':
if (output)
obstack_1grow (output, '\v');
++tokptr;
break;
/* GCC extension. */
case 'e':
if (output)
obstack_1grow (output, HOST_ESCAPE_CHAR);
++tokptr;
break;
/* Backslash-newline expands to nothing at all. */
case '\n':
++tokptr;
result = 0;
break;
/* A few escapes just expand to the character itself. */
case '\'':
case '\"':
case '?':
/* GCC extensions. */
case '(':
case '{':
case '[':
case '%':
/* Unrecognized escapes turn into the character itself. */
default:
if (output)
obstack_1grow (output, *tokptr);
++tokptr;
break;
}
*ptr = tokptr;
return result;
}
/* Parse a string or character literal from TOKPTR. The string or
character may be wide or unicode. *OUTPTR is set to just after the
end of the literal in the input string. The resulting token is
stored in VALUE. This returns a token value, either STRING or
CHAR, depending on what was parsed. *HOST_CHARS is set to the
number of host characters in the literal. */
static int
parse_string_or_char (char *tokptr, char **outptr, struct typed_stoken *value,
int *host_chars)
{
int quote, i;
enum c_string_type type;
/* Build the gdb internal form of the input string in tempbuf. Note
that the buffer is null byte terminated *only* for the
convenience of debugging gdb itself and printing the buffer
contents when the buffer contains no embedded nulls. Gdb does
not depend upon the buffer being null byte terminated, it uses
the length string instead. This allows gdb to handle C strings
(as well as strings in other languages) with embedded null
bytes */
if (!tempbuf_init)
tempbuf_init = 1;
else
obstack_free (&tempbuf, NULL);
obstack_init (&tempbuf);
/* Record the string type. */
if (*tokptr == 'L')
{
type = C_WIDE_STRING;
++tokptr;
}
else if (*tokptr == 'u')
{
type = C_STRING_16;
++tokptr;
}
else if (*tokptr == 'U')
{
type = C_STRING_32;
++tokptr;
}
else
type = C_STRING;
/* Skip the quote. */
quote = *tokptr;
if (quote == '\'')
type |= C_CHAR;
++tokptr;
*host_chars = 0;
while (*tokptr)
{
char c = *tokptr;
if (c == '\\')
{
++tokptr;
*host_chars += c_parse_escape (&tokptr, &tempbuf);
}
else if (c == quote)
break;
else
{
obstack_1grow (&tempbuf, c);
++tokptr;
/* FIXME: this does the wrong thing with multi-byte host
characters. We could use mbrlen here, but that would
make "set host-charset" a bit less useful. */
++*host_chars;
}
}
if (*tokptr != quote)
{
if (quote == '"')
error ("Unterminated string in expression.");
else
error ("Unmatched single quote.");
}
++tokptr;
value->type = type;
value->ptr = obstack_base (&tempbuf);
value->length = obstack_object_size (&tempbuf);
*outptr = tokptr;
return quote == '"' ? STRING : CHAR;
}
struct token
{
char *operator;
int token;
enum exp_opcode opcode;
int cxx_only;
};
static const struct token tokentab3[] =
{
{">>=", ASSIGN_MODIFY, BINOP_RSH, 0},
{"<<=", ASSIGN_MODIFY, BINOP_LSH, 0},
{"->*", ARROW_STAR, BINOP_END, 1}
};
static const struct token tokentab2[] =
{
{"+=", ASSIGN_MODIFY, BINOP_ADD, 0},
{"-=", ASSIGN_MODIFY, BINOP_SUB, 0},
{"*=", ASSIGN_MODIFY, BINOP_MUL, 0},
{"/=", ASSIGN_MODIFY, BINOP_DIV, 0},
{"%=", ASSIGN_MODIFY, BINOP_REM, 0},
{"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 0},
{"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND, 0},
{"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 0},
{"++", INCREMENT, BINOP_END, 0},
{"--", DECREMENT, BINOP_END, 0},
{"->", ARROW, BINOP_END, 0},
{"&&", ANDAND, BINOP_END, 0},
{"||", OROR, BINOP_END, 0},
/* "::" is *not* only C++: gdb overrides its meaning in several
different ways, e.g., 'filename'::func, function::variable. */
{"::", COLONCOLON, BINOP_END, 0},
{"<<", LSH, BINOP_END, 0},
{">>", RSH, BINOP_END, 0},
{"==", EQUAL, BINOP_END, 0},
{"!=", NOTEQUAL, BINOP_END, 0},
{"<=", LEQ, BINOP_END, 0},
{">=", GEQ, BINOP_END, 0},
{".*", DOT_STAR, BINOP_END, 1}
};
/* Identifier-like tokens. */
static const struct token ident_tokens[] =
{
{"unsigned", UNSIGNED, OP_NULL, 0},
{"template", TEMPLATE, OP_NULL, 1},
{"volatile", VOLATILE_KEYWORD, OP_NULL, 0},
{"struct", STRUCT, OP_NULL, 0},
{"signed", SIGNED_KEYWORD, OP_NULL, 0},
{"sizeof", SIZEOF, OP_NULL, 0},
{"double", DOUBLE_KEYWORD, OP_NULL, 0},
{"false", FALSEKEYWORD, OP_NULL, 1},
{"class", CLASS, OP_NULL, 1},
{"union", UNION, OP_NULL, 0},
{"short", SHORT, OP_NULL, 0},
{"const", CONST_KEYWORD, OP_NULL, 0},
{"enum", ENUM, OP_NULL, 0},
{"long", LONG, OP_NULL, 0},
{"true", TRUEKEYWORD, OP_NULL, 1},
{"int", INT_KEYWORD, OP_NULL, 0},
{"and", ANDAND, BINOP_END, 1},
{"and_eq", ASSIGN_MODIFY, BINOP_BITWISE_AND, 1},
{"bitand", '&', OP_NULL, 1},
{"bitor", '|', OP_NULL, 1},
{"compl", '~', OP_NULL, 1},
{"not", '!', OP_NULL, 1},
{"not_eq", NOTEQUAL, BINOP_END, 1},
{"or", OROR, BINOP_END, 1},
{"or_eq", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 1},
{"xor", '^', OP_NULL, 1},
{"xor_eq", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 1}
};
/* When we find that lexptr (the global var defined in parse.c) is
pointing at a macro invocation, we expand the invocation, and call
scan_macro_expansion to save the old lexptr here and point lexptr
into the expanded text. When we reach the end of that, we call
end_macro_expansion to pop back to the value we saved here. The
macro expansion code promises to return only fully-expanded text,
so we don't need to "push" more than one level.
This is disgusting, of course. It would be cleaner to do all macro
expansion beforehand, and then hand that to lexptr. But we don't
really know where the expression ends. Remember, in a command like
(gdb) break *ADDRESS if CONDITION
we evaluate ADDRESS in the scope of the current frame, but we
evaluate CONDITION in the scope of the breakpoint's location. So
it's simply wrong to try to macro-expand the whole thing at once. */
static char *macro_original_text;
/* We save all intermediate macro expansions on this obstack for the
duration of a single parse. The expansion text may sometimes have
to live past the end of the expansion, due to yacc lookahead.
Rather than try to be clever about saving the data for a single
token, we simply keep it all and delete it after parsing has
completed. */
static struct obstack expansion_obstack;
static void
scan_macro_expansion (char *expansion)
{
char *copy;
/* We'd better not be trying to push the stack twice. */
gdb_assert (! macro_original_text);
/* Copy to the obstack, and then free the intermediate
expansion. */
copy = obstack_copy0 (&expansion_obstack, expansion, strlen (expansion));
xfree (expansion);
/* Save the old lexptr value, so we can return to it when we're done
parsing the expanded text. */
macro_original_text = lexptr;
lexptr = copy;
}
static int
scanning_macro_expansion (void)
{
return macro_original_text != 0;
}
static void
finished_macro_expansion (void)
{
/* There'd better be something to pop back to. */
gdb_assert (macro_original_text);
/* Pop back to the original text. */
lexptr = macro_original_text;
macro_original_text = 0;
}
static void
scan_macro_cleanup (void *dummy)
{
if (macro_original_text)
finished_macro_expansion ();
obstack_free (&expansion_obstack, NULL);
}
/* The scope used for macro expansion. */
static struct macro_scope *expression_macro_scope;
/* This is set if a NAME token appeared at the very end of the input
string, with no whitespace separating the name from the EOF. This
is used only when parsing to do field name completion. */
static int saw_name_at_eof;
/* This is set if the previously-returned token was a structure
operator -- either '.' or ARROW. This is used only when parsing to
do field name completion. */
static int last_was_structop;
/* Read one token, getting characters through lexptr. */
static int
yylex (void)
{
int c;
int namelen;
unsigned int i;
char *tokstart;
int saw_structop = last_was_structop;
char *copy;
last_was_structop = 0;
retry:
/* Check if this is a macro invocation that we need to expand. */
if (! scanning_macro_expansion ())
{
char *expanded = macro_expand_next (&lexptr,
standard_macro_lookup,
expression_macro_scope);
if (expanded)
scan_macro_expansion (expanded);
}
prev_lexptr = lexptr;
tokstart = lexptr;
/* See if it is a special token of length 3. */
for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
if (strncmp (tokstart, tokentab3[i].operator, 3) == 0)
{
if (tokentab3[i].cxx_only
&& parse_language->la_language != language_cplus)
break;
lexptr += 3;
yylval.opcode = tokentab3[i].opcode;
return tokentab3[i].token;
}
/* See if it is a special token of length 2. */
for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
if (strncmp (tokstart, tokentab2[i].operator, 2) == 0)
{
if (tokentab2[i].cxx_only
&& parse_language->la_language != language_cplus)
break;
lexptr += 2;
yylval.opcode = tokentab2[i].opcode;
if (in_parse_field && tokentab2[i].token == ARROW)
last_was_structop = 1;
return tokentab2[i].token;
}
switch (c = *tokstart)
{
case 0:
/* If we were just scanning the result of a macro expansion,
then we need to resume scanning the original text.
If we're parsing for field name completion, and the previous
token allows such completion, return a COMPLETE token.
Otherwise, we were already scanning the original text, and
we're really done. */
if (scanning_macro_expansion ())
{
finished_macro_expansion ();
goto retry;
}
else if (saw_name_at_eof)
{
saw_name_at_eof = 0;
return COMPLETE;
}
else if (saw_structop)
return COMPLETE;
else
return 0;
case ' ':
case '\t':
case '\n':
lexptr++;
goto retry;
case '[':
case '(':
paren_depth++;
lexptr++;
return c;
case ']':
case ')':
if (paren_depth == 0)
return 0;
paren_depth--;
lexptr++;
return c;
case ',':
if (comma_terminates
&& paren_depth == 0
&& ! scanning_macro_expansion ())
return 0;
lexptr++;
return c;
case '.':
/* Might be a floating point number. */
if (lexptr[1] < '0' || lexptr[1] > '9')
{
if (in_parse_field)
last_was_structop = 1;
goto symbol; /* Nope, must be a symbol. */
}
/* FALL THRU into number case. */
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
{
/* It's a number. */
int got_dot = 0, got_e = 0, toktype;
char *p = tokstart;
int hex = input_radix > 10;
if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
{
p += 2;
hex = 1;
}
else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
{
p += 2;
hex = 0;
}
for (;; ++p)
{
/* This test includes !hex because 'e' is a valid hex digit
and thus does not indicate a floating point number when
the radix is hex. */
if (!hex && !got_e && (*p == 'e' || *p == 'E'))
got_dot = got_e = 1;
/* This test does not include !hex, because a '.' always indicates
a decimal floating point number regardless of the radix. */
else if (!got_dot && *p == '.')
got_dot = 1;
else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
&& (*p == '-' || *p == '+'))
/* This is the sign of the exponent, not the end of the
number. */
continue;
/* We will take any letters or digits. parse_number will
complain if past the radix, or if L or U are not final. */
else if ((*p < '0' || *p > '9')
&& ((*p < 'a' || *p > 'z')
&& (*p < 'A' || *p > 'Z')))
break;
}
toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
if (toktype == ERROR)
{
char *err_copy = (char *) alloca (p - tokstart + 1);
memcpy (err_copy, tokstart, p - tokstart);
err_copy[p - tokstart] = 0;
error ("Invalid number \"%s\".", err_copy);
}
lexptr = p;
return toktype;
}
case '+':
case '-':
case '*':
case '/':
case '%':
case '|':
case '&':
case '^':
case '~':
case '!':
case '@':
case '<':
case '>':
case '?':
case ':':
case '=':
case '{':
case '}':
symbol:
lexptr++;
return c;
case 'L':
case 'u':
case 'U':
if (tokstart[1] != '"' && tokstart[1] != '\'')
break;
/* Fall through. */
case '\'':
case '"':
{
int host_len;
int result = parse_string_or_char (tokstart, &lexptr, &yylval.tsval,
&host_len);
if (result == CHAR)
{
if (host_len == 0)
error ("Empty character constant.");
else if (host_len > 2 && c == '\'')
{
++tokstart;
namelen = lexptr - tokstart - 1;
goto tryname;
}
else if (host_len > 1)
error ("Invalid character constant.");
}
return result;
}
}
if (!(c == '_' || c == '$'
|| (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
/* We must have come across a bad character (e.g. ';'). */
error ("Invalid character '%c' in expression.", c);
/* It's a name. See how long it is. */
namelen = 0;
for (c = tokstart[namelen];
(c == '_' || c == '$' || (c >= '0' && c <= '9')
|| (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
{
/* Template parameter lists are part of the name.
FIXME: This mishandles `print $a<4&&$a>3'. */
if (c == '<')
{
/* Scan ahead to get rest of the template specification. Note
that we look ahead only when the '<' adjoins non-whitespace
characters; for comparison expressions, e.g. "a < b > c",
there must be spaces before the '<', etc. */
char * p = find_template_name_end (tokstart + namelen);
if (p)
namelen = p - tokstart;
break;
}
c = tokstart[++namelen];
}
/* The token "if" terminates the expression and is NOT removed from
the input stream. It doesn't count if it appears in the
expansion of a macro. */
if (namelen == 2
&& tokstart[0] == 'i'
&& tokstart[1] == 'f'
&& ! scanning_macro_expansion ())
{
return 0;
}
lexptr += namelen;
tryname:
yylval.sval.ptr = tokstart;
yylval.sval.length = namelen;
/* Catch specific keywords. */
copy = copy_name (yylval.sval);
for (i = 0; i < sizeof ident_tokens / sizeof ident_tokens[0]; i++)
if (strcmp (copy, ident_tokens[i].operator) == 0)
{
if (ident_tokens[i].cxx_only
&& parse_language->la_language != language_cplus)
break;
/* It is ok to always set this, even though we don't always
strictly need to. */
yylval.opcode = ident_tokens[i].opcode;
return ident_tokens[i].token;
}
if (*tokstart == '$')
{
write_dollar_variable (yylval.sval);
return VARIABLE;
}
/* Use token-type BLOCKNAME for symbols that happen to be defined as
functions or symtabs. If this is not so, then ...
Use token-type TYPENAME for symbols that happen to be defined
currently as names of types; NAME for other symbols.
The caller is not constrained to care about the distinction. */
{
struct symbol *sym;
int is_a_field_of_this = 0;
int hextype;
sym = lookup_symbol (copy, expression_context_block,
VAR_DOMAIN,
parse_language->la_language == language_cplus
? &is_a_field_of_this : (int *) NULL);
/* Call lookup_symtab, not lookup_partial_symtab, in case there are
no psymtabs (coff, xcoff, or some future change to blow away the
psymtabs once once symbols are read). */
if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
{
yylval.ssym.sym = sym;
yylval.ssym.is_a_field_of_this = is_a_field_of_this;
return BLOCKNAME;
}
else if (!sym)
{ /* See if it's a file name. */
struct symtab *symtab;
symtab = lookup_symtab (copy);
if (symtab)
{
yylval.bval = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), STATIC_BLOCK);
return FILENAME;
}
}
if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
{
/* NOTE: carlton/2003-09-25: There used to be code here to
handle nested types. It didn't work very well. See the
comment before qualified_type for more info. */
yylval.tsym.type = SYMBOL_TYPE (sym);
return TYPENAME;
}
yylval.tsym.type
= language_lookup_primitive_type_by_name (parse_language,
parse_gdbarch, copy);
if (yylval.tsym.type != NULL)
return TYPENAME;
/* Input names that aren't symbols but ARE valid hex numbers,
when the input radix permits them, can be names or numbers
depending on the parse. Note we support radixes > 16 here. */
if (!sym &&
((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10) ||
(tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
{
YYSTYPE newlval; /* Its value is ignored. */
hextype = parse_number (tokstart, namelen, 0, &newlval);
if (hextype == INT)
{
yylval.ssym.sym = sym;
yylval.ssym.is_a_field_of_this = is_a_field_of_this;
return NAME_OR_INT;
}
}
/* Any other kind of symbol */
yylval.ssym.sym = sym;
yylval.ssym.is_a_field_of_this = is_a_field_of_this;
if (in_parse_field && *lexptr == '\0')
saw_name_at_eof = 1;
return NAME;
}
}
int
c_parse (void)
{
int result;
struct cleanup *back_to = make_cleanup (free_current_contents,
&expression_macro_scope);
/* Set up the scope for macro expansion. */
expression_macro_scope = NULL;
if (expression_context_block)
expression_macro_scope
= sal_macro_scope (find_pc_line (expression_context_pc, 0));
else
expression_macro_scope = default_macro_scope ();
if (! expression_macro_scope)
expression_macro_scope = user_macro_scope ();
/* Initialize macro expansion code. */
obstack_init (&expansion_obstack);
gdb_assert (! macro_original_text);
make_cleanup (scan_macro_cleanup, 0);
/* Initialize some state used by the lexer. */
last_was_structop = 0;
saw_name_at_eof = 0;
result = yyparse ();
do_cleanups (back_to);
return result;
}
void
yyerror (char *msg)
{
if (prev_lexptr)
lexptr = prev_lexptr;
error ("A %s in expression, near `%s'.", (msg ? msg : "error"), lexptr);
}
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