/* * Copyright © 2016 Keith Packard * * This program 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 2 of the License, or * (at your option) any later version. * * This program 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. */ #ifndef _AO_LISP_H_ #define _AO_LISP_H_ #if !defined(AO_LISP_TEST) && !defined(AO_LISP_MAKE_CONST) #include #define AO_LISP_ALTOS 1 #endif #include #include #include #ifdef AO_LISP_MAKE_CONST #define AO_LISP_POOL_CONST 16384 extern uint8_t ao_lisp_const[AO_LISP_POOL_CONST]; #define _ao_lisp_atom_quote ao_lisp_atom_poly(ao_lisp_atom_intern("quote")) #else #include "ao_lisp_const.h" #endif /* Primitive types */ #define AO_LISP_CONS 0 #define AO_LISP_INT 1 #define AO_LISP_STRING 2 #define AO_LISP_OTHER 3 #define AO_LISP_TYPE_MASK 0x0003 #define AO_LISP_TYPE_SHIFT 2 #define AO_LISP_REF_MASK 0x7ffc #define AO_LISP_CONST 0x8000 /* These have a type value at the start of the struct */ #define AO_LISP_ATOM 4 #define AO_LISP_BUILTIN 5 #define AO_LISP_NUM_TYPE 6 #define AO_LISP_NIL 0 #define AO_LISP_POOL 1024 extern uint8_t ao_lisp_pool[AO_LISP_POOL]; extern uint16_t ao_lisp_top; #define AO_LISP_OOM 0x01 #define AO_LISP_DIVIDE_BY_ZERO 0x02 #define AO_LISP_INVALID 0x04 extern uint8_t ao_lisp_exception; typedef uint16_t ao_poly; static inline int ao_lisp_is_const(ao_poly poly) { return poly & AO_LISP_CONST; } static inline void * ao_lisp_ref(ao_poly poly) { if (poly == AO_LISP_NIL) return NULL; if (poly & AO_LISP_CONST) return (void *) ((ao_lisp_const - 4) + (poly & AO_LISP_REF_MASK)); else return (void *) ((ao_lisp_pool - 4) + (poly & AO_LISP_REF_MASK)); } static inline ao_poly ao_lisp_poly(const void *addr, ao_poly type) { const uint8_t *a = addr; if (addr == NULL) return AO_LISP_NIL; if (ao_lisp_pool <= a && a < ao_lisp_pool + AO_LISP_POOL) return (a - (ao_lisp_pool - 4)) | type; else if (ao_lisp_const <= a && a <= ao_lisp_const + AO_LISP_POOL_CONST) return AO_LISP_CONST | (a - (ao_lisp_const - 4)) | type; else { ao_lisp_exception |= AO_LISP_INVALID; return AO_LISP_NIL; } } #define AO_LISP_POLY(addr, type) (((ao_lisp_pool <= ((uint8_t *) (a)) && \ ((uint8_t *) (a)) < ao_lisp_pool + AO_LISP_POOL) ? \ ((uint8_t *) (a) - (ao_lisp_pool - 4)) : \ (((uint8_t *) (a) - (ao_lisp_const - 4)) | AO_LISP_POOL_CONST)) | \ (type)) struct ao_lisp_type { void (*mark)(void *addr); int (*size)(void *addr); void (*move)(void *addr); }; struct ao_lisp_cons { ao_poly car; ao_poly cdr; }; struct ao_lisp_atom { uint8_t type; uint8_t pad[1]; ao_poly val; ao_poly next; char name[]; }; #define AO_LISP_LAMBDA 0 #define AO_LISP_NLAMBDA 1 #define AO_LISP_MACRO 2 #define AO_LISP_LEXPR 3 struct ao_lisp_builtin { uint8_t type; uint8_t args; uint16_t func; }; enum ao_lisp_builtin_id { builtin_car, builtin_cdr, builtin_cons, builtin_quote, builtin_set, builtin_setq, builtin_print, builtin_plus, builtin_minus, builtin_times, builtin_divide, builtin_mod, builtin_last }; typedef ao_poly (*ao_lisp_func_t)(struct ao_lisp_cons *cons); extern ao_lisp_func_t ao_lisp_builtins[]; static inline ao_lisp_func_t ao_lisp_func(struct ao_lisp_builtin *b) { return ao_lisp_builtins[b->func]; } static inline void * ao_lisp_poly_other(ao_poly poly) { return ao_lisp_ref(poly); } static inline ao_poly ao_lisp_other_poly(const void *other) { return ao_lisp_poly(other, AO_LISP_OTHER); } static inline int ao_lisp_mem_round(int size) { return (size + 3) & ~3; } #define AO_LISP_OTHER_POLY(other) ((ao_poly)(other) + AO_LISP_OTHER) static inline int ao_lisp_poly_type(ao_poly poly) { int type = poly & 3; if (type == AO_LISP_OTHER) return *((uint8_t *) ao_lisp_poly_other(poly)); return type; } static inline struct ao_lisp_cons * ao_lisp_poly_cons(ao_poly poly) { return ao_lisp_ref(poly); } static inline ao_poly ao_lisp_cons_poly(struct ao_lisp_cons *cons) { return ao_lisp_poly(cons, AO_LISP_CONS); } static inline int ao_lisp_poly_int(ao_poly poly) { return (int) poly >> AO_LISP_TYPE_SHIFT; } static inline ao_poly ao_lisp_int_poly(int i) { return ((ao_poly) i << 2) + AO_LISP_INT; } static inline char * ao_lisp_poly_string(ao_poly poly) { return ao_lisp_ref(poly); } static inline ao_poly ao_lisp_string_poly(char *s) { return ao_lisp_poly(s, AO_LISP_STRING); } static inline struct ao_lisp_atom * ao_lisp_poly_atom(ao_poly poly) { return ao_lisp_ref(poly); } static inline ao_poly ao_lisp_atom_poly(struct ao_lisp_atom *a) { return ao_lisp_poly(a, AO_LISP_OTHER); } static inline struct ao_lisp_builtin * ao_lisp_poly_builtin(ao_poly poly) { return ao_lisp_ref(poly); } static inline ao_poly ao_lisp_builtin_poly(struct ao_lisp_builtin *b) { return ao_lisp_poly(b, AO_LISP_OTHER); } /* memory functions */ void ao_lisp_mark(const struct ao_lisp_type *type, void *addr); /* returns 1 if the object was already marked */ int ao_lisp_mark_memory(void *addr, int size); void * ao_lisp_move(const struct ao_lisp_type *type, void *addr); /* returns NULL if the object was already moved */ void * ao_lisp_move_memory(void *addr, int size); void * ao_lisp_alloc(int size); int ao_lisp_root_add(const struct ao_lisp_type *type, void *addr); void ao_lisp_root_clear(void *addr); /* cons */ extern const struct ao_lisp_type ao_lisp_cons_type; struct ao_lisp_cons * ao_lisp_cons_cons(ao_poly car, struct ao_lisp_cons *cdr); void ao_lisp_cons_print(ao_poly); /* string */ extern const struct ao_lisp_type ao_lisp_string_type; char * ao_lisp_string_new(int len); char * ao_lisp_string_copy(char *a); char * ao_lisp_string_cat(char *a, char *b); void ao_lisp_string_print(ao_poly s); /* atom */ extern const struct ao_lisp_type ao_lisp_atom_type; extern struct ao_lisp_atom *ao_lisp_atoms; void ao_lisp_atom_init(void); void ao_lisp_atom_print(ao_poly a); struct ao_lisp_atom * ao_lisp_atom_intern(char *name); /* int */ void ao_lisp_int_print(ao_poly i); /* prim */ ao_poly ao_lisp_poly_print(ao_poly p); void ao_lisp_poly_mark(ao_poly p); ao_poly ao_lisp_poly_move(ao_poly p); /* eval */ ao_poly ao_lisp_eval(ao_poly p); /* builtin */ void ao_lisp_builtin_print(ao_poly b); /* read */ ao_poly ao_lisp_read(void); /* rep */ ao_poly ao_lisp_read_eval_print(void); #endif /* _AO_LISP_H_ */