mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-24 01:33:32 +08:00
648acaa0c0
symbol_new, for symbols holding expression values. * expr.h (make_expr_symbol): Move declaration here.
125 lines
4.4 KiB
C
125 lines
4.4 KiB
C
/* expr.h -> header file for expr.c
|
|
Copyright (C) 1987, 1992, 1993 Free Software Foundation, Inc.
|
|
|
|
This file is part of GAS, the GNU Assembler.
|
|
|
|
GAS 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.
|
|
|
|
GAS 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 GAS; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
/*
|
|
* By popular demand, we define a struct to represent an expression.
|
|
* This will no doubt mutate as expressions become baroque.
|
|
*
|
|
* Currently, we support expressions like "foo OP bar + 42". In other
|
|
* words we permit a (possibly undefined) symbol, a (possibly
|
|
* undefined) symbol and the operation used to combine the symbols,
|
|
* and an (absolute) augend. RMS says this is so we can have 1-pass
|
|
* assembly for any compiler emissions, and a 'case' statement might
|
|
* emit 'undefined1 - undefined2'.
|
|
*
|
|
* The type of an expression used to be stored as a segment. That got
|
|
* confusing because it overloaded the concept of a segment. I added
|
|
* an operator field, instead.
|
|
*/
|
|
|
|
/* This is the type of an expression. The operator types are also
|
|
used while parsing an expression.
|
|
|
|
NOTE: This enumeration must match the op_rank array in expr.c. */
|
|
|
|
typedef enum
|
|
{
|
|
/* An illegal expression. */
|
|
O_illegal,
|
|
/* A nonexistent expression. */
|
|
O_absent,
|
|
/* X_add_number (a constant expression). */
|
|
O_constant,
|
|
/* X_add_symbol + X_add_number. */
|
|
O_symbol,
|
|
/* A register (X_add_number is register number). */
|
|
O_register,
|
|
/* A big value. If X_add_number is negative or 0, the value is in
|
|
generic_floating_point_number. Otherwise the value is in
|
|
generic_bignum, and X_add_number is the number of LITTLENUMs in
|
|
the value. */
|
|
O_big,
|
|
/* (- X_add_symbol) + X_add_number. */
|
|
O_uminus,
|
|
/* (~ X_add_symbol) + X_add_number. */
|
|
O_bit_not,
|
|
/* (X_add_symbol * X_op_symbol) + X_add_number. */
|
|
O_multiply,
|
|
/* (X_add_symbol / X_op_symbol) + X_add_number. */
|
|
O_divide,
|
|
/* X_add_symbol % X_op_symbol) + X_add_number. */
|
|
O_modulus,
|
|
/* X_add_symbol << X_op_symbol) + X_add_number. */
|
|
O_left_shift,
|
|
/* X_add_symbol >> X_op_symbol) + X_add_number. */
|
|
O_right_shift,
|
|
/* X_add_symbol | X_op_symbol) + X_add_number. */
|
|
O_bit_inclusive_or,
|
|
/* X_add_symbol |~ X_op_symbol) + X_add_number. */
|
|
O_bit_or_not,
|
|
/* X_add_symbol ^ X_op_symbol) + X_add_number. */
|
|
O_bit_exclusive_or,
|
|
/* X_add_symbol & X_op_symbol) + X_add_number. */
|
|
O_bit_and,
|
|
/* X_add_symbol + X_op_symbol) + X_add_number. */
|
|
O_add,
|
|
/* X_add_symbol - X_op_symbol) + X_add_number. */
|
|
O_subtract
|
|
} operatorT;
|
|
|
|
typedef struct expressionS
|
|
{
|
|
/* The type of the expression. */
|
|
operatorT X_op;
|
|
/* The main symbol. */
|
|
struct symbol *X_add_symbol;
|
|
/* The second symbol, if needed. */
|
|
struct symbol *X_op_symbol;
|
|
/* A number to add. */
|
|
offsetT X_add_number;
|
|
/* Non-zero if X_add_number should be regarded as unsigned. This is
|
|
only valid for O_constant expressions. It is only used when an
|
|
O_constant must be extended into a bignum (i.e., it is not used
|
|
when performing arithmetic on these values).
|
|
FIXME: This field is not set very reliably.
|
|
If we ever need more flags here, we can make them bitfields. */
|
|
int X_unsigned;
|
|
} expressionS;
|
|
|
|
/* "result" should be type (expressionS *). */
|
|
#define expression(result) expr (0, result)
|
|
|
|
/* If an expression is O_big, look here for its value. These common
|
|
data may be clobbered whenever expr() is called. */
|
|
/* Flonums returned here. Big enough to hold most precise flonum. */
|
|
extern FLONUM_TYPE generic_floating_point_number;
|
|
/* Bignums returned here. */
|
|
extern LITTLENUM_TYPE generic_bignum[];
|
|
/* Number of littlenums in above. */
|
|
#define SIZE_OF_LARGE_NUMBER (20)
|
|
|
|
typedef char operator_rankT;
|
|
|
|
char get_symbol_end PARAMS ((void));
|
|
segT expr PARAMS ((int rank, expressionS * resultP));
|
|
unsigned int get_single_number PARAMS ((void));
|
|
symbolS *make_expr_symbol PARAMS ((expressionS * expressionP));
|
|
|
|
/* end of expr.h */
|