asmeval.h

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#ifndef ASMEVAL_H
#define ASMEVAL_H

enum exprtype {
    EXPR_ADDR,          // e.g. "foo", "seg foo" and "offset foo"
    EXPR_CONST,         // A constant; note that "label1 - label2" -> constant
    EXPR_REG,           // A register
    EXPR_UNDEF,         // undefined type when error occures or result is undefined
    EXPR_EMPTY = EMPTY
};

typedef struct expr_list {
    enum exprtype   type;           // Type of expression
    int_32          value;          // For constant, which may also be the offset
                                    //   to a label
    char            *string;        // for strings only -- NULL otherwise
    int             base_reg;       // position of token for base register
                                    // if type is EXPR_REG, it holds register
    int             idx_reg;        // position of token for index register
    int             label;          // Position of token holding the label
    int             override;       // Position of token holding the override label
                                    //   or register
    int             instr;          // instruction token for label
                                    //
    unsigned        indirect : 1;   // Whether inside [] or not
    unsigned        explicit : 1;   // Whether expression type explicitly given
    unsigned        empty    : 1;
    unsigned        abs      : 1;
    memtype         mem_type;       // Whether expr is BYTE, WORD, DWORD, etc.
    uint_8          scale;          // scaling factor 1, 2, 4, or 8 - 386 code only
    struct asm_sym  *sym;
    struct asm_sym  *mbr;
} expr_list;

extern int          EvalExpr( int, int, int, bool );
extern int          EvalOperand( int *, int, expr_list *, bool );
#if defined( _STANDALONE_ )
extern int          EvalConstant( int, int, int, bool );
#endif

#endif