+/* 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,
+ /* X_add_symbol + X_add_number - the base address of the image. */
+ O_symbol_rva,
+ /* 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. We can't assume that an arbitrary
+ compiler can handle a bitfield of enum type. FIXME: We could
+ check this using autoconf. */
+#ifdef __GNUC__
+ operatorT X_op : 8;
+#else
+ unsigned char X_op;
+#endif
+
+ /* 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. */
+ 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;
+
+ /* 7 additional bits can be defined if needed. */
+
+ /* Machine dependent field */
+ unsigned short X_md;
+} expressionS;
+
+enum expr_mode