expr.h

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#ifndef YASM_EXPR_H
#define YASM_EXPR_H

#ifndef YASM_LIB_DECL
#define YASM_LIB_DECL
#endif

typedef enum yasm_expr__type {
    YASM_EXPR_NONE = 0,     
    YASM_EXPR_REG = 1<<0,   
    YASM_EXPR_INT = 1<<1,   
    YASM_EXPR_SUBST = 1<<2, 
    YASM_EXPR_FLOAT = 1<<3, 
    YASM_EXPR_SYM = 1<<4,   
    YASM_EXPR_PRECBC = 1<<5,
    YASM_EXPR_EXPR = 1<<6   
} yasm_expr__type;

typedef struct yasm_expr__item {
    yasm_expr__type type;   
    union {
        yasm_bytecode *precbc;  
        yasm_symrec *sym;       
        yasm_expr *expn;        
        yasm_intnum *intn;      
        yasm_floatnum *flt;     
        uintptr_t reg;          
        unsigned int subst;     
    } data;
} yasm_expr__item;

struct yasm_expr {
    yasm_expr_op op;    
    unsigned long line; 
    int numterms;       
    yasm_expr__item terms[2];
};

YASM_LIB_DECL
/*@only@*/ yasm_expr *yasm_expr_create
    (yasm_expr_op op, /*@only@*/ yasm_expr__item *a,
     /*@only@*/ /*@null@*/ yasm_expr__item *b, unsigned long line);

YASM_LIB_DECL
/*@only@*/ yasm_expr__item *yasm_expr_precbc(/*@keep@*/ yasm_bytecode *precbc);

YASM_LIB_DECL
/*@only@*/ yasm_expr__item *yasm_expr_sym(/*@keep@*/ yasm_symrec *sym);

YASM_LIB_DECL
/*@only@*/ yasm_expr__item *yasm_expr_expr(/*@keep@*/ yasm_expr *e);

YASM_LIB_DECL
/*@only@*/ yasm_expr__item *yasm_expr_int(/*@keep@*/ yasm_intnum *intn);

YASM_LIB_DECL
/*@only@*/ yasm_expr__item *yasm_expr_float(/*@keep@*/ yasm_floatnum *flt);

YASM_LIB_DECL
/*@only@*/ yasm_expr__item *yasm_expr_reg(uintptr_t reg);

#define yasm_expr_create_tree(l,o,r,i) \
    yasm_expr_create ((o), yasm_expr_expr(l), yasm_expr_expr(r), i)

#define yasm_expr_create_branch(o,r,i) \
    yasm_expr_create ((o), yasm_expr_expr(r), (yasm_expr__item *)NULL, i)

#define yasm_expr_create_ident(r,i) \
    yasm_expr_create (YASM_EXPR_IDENT, (r), (yasm_expr__item *)NULL, i)

yasm_expr *yasm_expr_copy(const yasm_expr *e);
#ifndef YASM_DOXYGEN
#define yasm_expr_copy(e)   yasm_expr__copy_except(e, -1)
#endif

YASM_LIB_DECL
void yasm_expr_destroy(/*@only@*/ /*@null@*/ yasm_expr *e);

YASM_LIB_DECL
int yasm_expr_is_op(const yasm_expr *e, yasm_expr_op op);

typedef /*@only@*/ yasm_expr * (*yasm_expr_xform_func)
    (/*@returned@*/ /*@only@*/ yasm_expr *e, /*@null@*/ void *d);

YASM_LIB_DECL
/*@only@*/ /*@null@*/ yasm_expr *yasm_expr__level_tree
    (/*@returned@*/ /*@only@*/ /*@null@*/ yasm_expr *e, int fold_const,
     int simplify_ident, int simplify_reg_mul, int calc_bc_dist,
     /*@null@*/ yasm_expr_xform_func expr_xform_extra,
     /*@null@*/ void *expr_xform_extra_data);

#define yasm_expr_simplify(e, cbd) \
    yasm_expr__level_tree(e, 1, 1, 1, cbd, NULL, NULL)

YASM_LIB_DECL
/*@only@*/ /*@null@*/ yasm_expr *yasm_expr_extract_deep_segoff(yasm_expr **ep);

YASM_LIB_DECL
/*@only@*/ /*@null@*/ yasm_expr *yasm_expr_extract_segoff(yasm_expr **ep);

YASM_LIB_DECL
/*@only@*/ /*@null@*/ yasm_expr *yasm_expr_extract_wrt(yasm_expr **ep);

YASM_LIB_DECL
/*@dependent@*/ /*@null@*/ yasm_intnum *yasm_expr_get_intnum
    (yasm_expr **ep, int calc_bc_dist);

YASM_LIB_DECL
/*@dependent@*/ /*@null@*/ const yasm_symrec *yasm_expr_get_symrec
    (yasm_expr **ep, int simplify);

YASM_LIB_DECL
/*@dependent@*/ /*@null@*/ const uintptr_t *yasm_expr_get_reg
    (yasm_expr **ep, int simplify);

YASM_LIB_DECL
void yasm_expr_print(/*@null@*/ const yasm_expr *e, FILE *f);

YASM_LIB_DECL
unsigned int yasm_expr_size(const yasm_expr *e);

YASM_LIB_DECL
const char *yasm_expr_segment(const yasm_expr *e);

YASM_LIB_DECL
int yasm_expr__traverse_leaves_in_const
    (const yasm_expr *e, /*@null@*/ void *d,
     int (*func) (/*@null@*/ const yasm_expr__item *ei, /*@null@*/ void *d));

YASM_LIB_DECL
int yasm_expr__traverse_leaves_in
    (yasm_expr *e, /*@null@*/ void *d,
     int (*func) (/*@null@*/ yasm_expr__item *ei, /*@null@*/ void *d));

YASM_LIB_DECL
void yasm_expr__order_terms(yasm_expr *e);

YASM_LIB_DECL
yasm_expr *yasm_expr__copy_except(const yasm_expr *e, int except);

YASM_LIB_DECL
int yasm_expr__contains(const yasm_expr *e, yasm_expr__type t);

YASM_LIB_DECL
int yasm_expr__bc_dist_subst(yasm_expr **ep, void *cbd,
                             void (*callback) (unsigned int subst,
                                               yasm_bytecode *precbc,
                                               yasm_bytecode *precbc2,
                                               void *cbd));

YASM_LIB_DECL
int yasm_expr__subst(yasm_expr *e, unsigned int num_items,
                     const yasm_expr__item *items);

#endif