/* expr.h -> header file for expr.c   Copyright (C) 1987-2026 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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA   02110-1301, 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 operatorT{  /* 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,  /* X_add_symbol + X_add_number - the base address of the image.  */  O_symbol_rva,  /* The section index of X_add_symbol.  */  O_secidx,  /* 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_add_number.  */  O_logical_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,  /* (X_add_symbol == X_op_symbol) + X_add_number.  */  O_eq,  /* (X_add_symbol != X_op_symbol) + X_add_number.  */  O_ne,  /* (X_add_symbol < X_op_symbol) + X_add_number.  */  O_lt,  /* (X_add_symbol <= X_op_symbol) + X_add_number.  */  O_le,  /* (X_add_symbol >= X_op_symbol) + X_add_number.  */  O_ge,  /* (X_add_symbol > X_op_symbol) + X_add_number.  */  O_gt,  /* (X_add_symbol && X_op_symbol) + X_add_number.  */  O_logical_and,  /* (X_add_symbol || X_op_symbol) + X_add_number.  */  O_logical_or,  /* X_op_symbol [ X_add_symbol ] */  O_index,  /* machine dependent operators */  O_md1,  O_md2,  O_md3,  O_md4,  O_md5,  O_md6,  O_md7,  O_md8,  O_md9,  O_md10, O_md11, O_md12, O_md13, O_md14, O_md15, O_md16,  O_md17, O_md18, O_md19, O_md20, O_md21, O_md22, O_md23, O_md24,  O_md25, O_md26, O_md27, O_md28, O_md29, O_md30, O_md31, O_md32,  /* this must be the largest value */  O_max} operatorT; typedef struct expressionS{  /* The main symbol.  */  symbolS *X_add_symbol;  /* The second symbol, if needed.  */  symbolS *X_op_symbol;  /* A number to add.  */  offsetT X_add_number;   /* The type of the expression.  */  ENUM_BITFIELD (operatorT) X_op : 8;   /* Non-zero if the expression value should be regarded as unsigned.  This is     only valid for     - O_constant expressions, where 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),     - O_big integer expressions, i.e. when X_add_number is positive.     FIXME: This field is not set very reliably.  */  unsigned int X_unsigned : 1;  /* This is used to implement "word size + 1 bit" arithmetic, so that e.g.     expressions used with .sleb128 directives can use the full range available     for an unsigned word, but can also properly represent all values of a     signed word.  */  unsigned int X_extrabit : 1;   /* Machine dependent field.  */  unsigned short X_md;} expressionS; enum expr_mode{  expr_evaluate,  expr_normal,  expr_defer,  expr_defer_incl_dot,}; #define expr_defer_p(m) ((m) >= expr_defer) /* "result" should be type (expressionS *).  */#define expression(result) expr (0, result, expr_normal)#define expression_and_evaluate(result) expr (0, result, expr_evaluate)#define deferred_expression(result) expr (0, result, expr_defer) /* 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; extern char get_symbol_name (char **);extern char restore_line_pointer (char);extern void expr_begin (void);extern void expr_end (void);extern void expr_set_precedence (void);extern void expr_set_rank (operatorT, operator_rankT);extern void add_to_result (expressionS *, offsetT, int);extern void subtract_from_result (expressionS *, offsetT, int);extern segT expr (int, expressionS *, enum expr_mode);extern unsigned int get_single_number (void);extern symbolS *make_expr_symbol (const expressionS * expressionP);extern int expr_symbol_where (symbolS *, const char **, unsigned int *);extern void current_location (expressionS *, enum expr_mode);extern symbolS *expr_build_uconstant (offsetT);extern symbolS *expr_build_dot (void);extern uint32_t generic_bignum_to_int32 (void);extern uint64_t generic_bignum_to_int64 (void);extern int resolve_expression (expressionS *);extern void resolve_register (expressionS *); extern bool literal_prefix_dollar_hex;