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[/] [openrisc/] [trunk/] [gnu-stable/] [binutils-2.20.1/] [gas/] [expr.h] - Blame information for rev 818

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1 205 julius
/* expr.h -> header file for expr.c
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   Copyright 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
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   2002, 2003, 2005, 2007, 2009 Free Software Foundation, Inc.
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   This file is part of GAS, the GNU Assembler.
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   GAS is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3, or (at your option)
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   any later version.
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   GAS is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with GAS; see the file COPYING.  If not, write to the Free
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   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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   02110-1301, USA.  */
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/*
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 * By popular demand, we define a struct to represent an expression.
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 * This will no doubt mutate as expressions become baroque.
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 *
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 * Currently, we support expressions like "foo OP bar + 42".  In other
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 * words we permit a (possibly undefined) symbol, a (possibly
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 * undefined) symbol and the operation used to combine the symbols,
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 * and an (absolute) augend.  RMS says this is so we can have 1-pass
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 * assembly for any compiler emissions, and a 'case' statement might
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 * emit 'undefined1 - undefined2'.
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 *
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 * The type of an expression used to be stored as a segment.  That got
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 * confusing because it overloaded the concept of a segment.  I added
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 * an operator field, instead.
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 */
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/* This is the type of an expression.  The operator types are also
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   used while parsing an expression.
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   NOTE: This enumeration must match the op_rank array in expr.c.  */
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typedef enum {
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  /* An illegal expression.  */
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  O_illegal,
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  /* A nonexistent expression.  */
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  O_absent,
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  /* X_add_number (a constant expression).  */
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  O_constant,
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  /* X_add_symbol + X_add_number.  */
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  O_symbol,
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  /* X_add_symbol + X_add_number - the base address of the image.  */
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  O_symbol_rva,
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  /* A register (X_add_number is register number).  */
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  O_register,
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  /* A big value.  If X_add_number is negative or 0, the value is in
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     generic_floating_point_number.  Otherwise the value is in
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     generic_bignum, and X_add_number is the number of LITTLENUMs in
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     the value.  */
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  O_big,
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  /* (- X_add_symbol) + X_add_number.  */
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  O_uminus,
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  /* (~ X_add_symbol) + X_add_number.  */
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  O_bit_not,
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  /* (! X_add_symbol) + X_add_number.  */
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  O_logical_not,
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  /* (X_add_symbol * X_op_symbol) + X_add_number.  */
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  O_multiply,
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  /* (X_add_symbol / X_op_symbol) + X_add_number.  */
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  O_divide,
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  /* (X_add_symbol % X_op_symbol) + X_add_number.  */
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  O_modulus,
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  /* (X_add_symbol << X_op_symbol) + X_add_number.  */
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  O_left_shift,
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  /* (X_add_symbol >> X_op_symbol) + X_add_number.  */
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  O_right_shift,
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  /* (X_add_symbol | X_op_symbol) + X_add_number.  */
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  O_bit_inclusive_or,
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  /* (X_add_symbol |~ X_op_symbol) + X_add_number.  */
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  O_bit_or_not,
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  /* (X_add_symbol ^ X_op_symbol) + X_add_number.  */
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  O_bit_exclusive_or,
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  /* (X_add_symbol & X_op_symbol) + X_add_number.  */
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  O_bit_and,
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  /* (X_add_symbol + X_op_symbol) + X_add_number.  */
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  O_add,
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  /* (X_add_symbol - X_op_symbol) + X_add_number.  */
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  O_subtract,
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  /* (X_add_symbol == X_op_symbol) + X_add_number.  */
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  O_eq,
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  /* (X_add_symbol != X_op_symbol) + X_add_number.  */
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  O_ne,
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  /* (X_add_symbol < X_op_symbol) + X_add_number.  */
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  O_lt,
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  /* (X_add_symbol <= X_op_symbol) + X_add_number.  */
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  O_le,
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  /* (X_add_symbol >= X_op_symbol) + X_add_number.  */
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  O_ge,
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  /* (X_add_symbol > X_op_symbol) + X_add_number.  */
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  O_gt,
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  /* (X_add_symbol && X_op_symbol) + X_add_number.  */
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  O_logical_and,
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  /* (X_add_symbol || X_op_symbol) + X_add_number.  */
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  O_logical_or,
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  /* X_op_symbol [ X_add_symbol ] */
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  O_index,
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  /* machine dependent operators */
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  O_md1,  O_md2,  O_md3,  O_md4,  O_md5,  O_md6,  O_md7,  O_md8,
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  O_md9,  O_md10, O_md11, O_md12, O_md13, O_md14, O_md15, O_md16,
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  O_md17, O_md18, O_md19, O_md20, O_md21, O_md22, O_md23, O_md24,
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  O_md25, O_md26, O_md27, O_md28, O_md29, O_md30, O_md31, O_md32,
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  /* this must be the largest value */
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  O_max
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} operatorT;
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typedef struct expressionS {
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  /* The main symbol.  */
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  symbolS *X_add_symbol;
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  /* The second symbol, if needed.  */
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  symbolS *X_op_symbol;
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  /* A number to add.  */
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  offsetT X_add_number;
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  /* The type of the expression.  We can't assume that an arbitrary
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     compiler can handle a bitfield of enum type.  FIXME: We could
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     check this using autoconf.  */
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#ifdef __GNUC__
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  operatorT X_op : 8;
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#else
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  unsigned char X_op;
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#endif
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  /* Non-zero if X_add_number should be regarded as unsigned.  This is
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     only valid for O_constant expressions.  It is only used when an
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     O_constant must be extended into a bignum (i.e., it is not used
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     when performing arithmetic on these values).
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     FIXME: This field is not set very reliably.  */
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  unsigned int X_unsigned : 1;
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  /* 7 additional bits can be defined if needed.  */
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  /* Machine dependent field */
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  unsigned short X_md;
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} expressionS;
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enum expr_mode
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{
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  expr_evaluate,
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  expr_normal,
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  expr_defer
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};
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/* "result" should be type (expressionS *).  */
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#define expression(result) expr (0, result, expr_normal)
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#define expression_and_evaluate(result) expr (0, result, expr_evaluate)
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#define deferred_expression(result) expr (0, result, expr_defer)
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/* If an expression is O_big, look here for its value. These common
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   data may be clobbered whenever expr() is called.  */
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/* Flonums returned here.  Big enough to hold most precise flonum.  */
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extern FLONUM_TYPE generic_floating_point_number;
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/* Bignums returned here.  */
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extern LITTLENUM_TYPE generic_bignum[];
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/* Number of littlenums in above.  */
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#define SIZE_OF_LARGE_NUMBER (20)
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typedef char operator_rankT;
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extern char get_symbol_end (void);
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extern void expr_begin (void);
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extern void expr_set_precedence (void);
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extern void expr_set_rank (operatorT, operator_rankT);
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extern segT expr (int, expressionS *, enum expr_mode);
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extern unsigned int get_single_number (void);
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extern symbolS *make_expr_symbol (expressionS * expressionP);
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extern int expr_symbol_where (symbolS *, char **, unsigned int *);
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extern symbolS *expr_build_uconstant (offsetT);
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extern symbolS *expr_build_dot (void);
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int resolve_expression (expressionS *);

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