286 lines
8.7 KiB
C
286 lines
8.7 KiB
C
#ifndef _FLISP_H_
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#define _FLISP_H_
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typedef uptrint_t value_t;
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typedef int_t fixnum_t;
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#ifdef BITS64
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#define T_FIXNUM T_INT64
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#else
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#define T_FIXNUM T_INT32
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#endif
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typedef struct {
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value_t car;
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value_t cdr;
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} cons_t;
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typedef struct _symbol_t {
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value_t syntax; // syntax environment entry
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value_t binding; // global value binding
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void *dlcache; // dlsym address
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uint32_t hash;
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// below fields are private
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struct _symbol_t *left;
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struct _symbol_t *right;
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union {
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char name[1];
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void *_pad; // ensure field aligned to pointer size
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};
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} symbol_t;
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#define TAG_NUM 0x0
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//0x1 unused
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#define TAG_BUILTIN 0x2
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#define TAG_VECTOR 0x3
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#define TAG_NUM1 0x4
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#define TAG_CVALUE 0x5
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#define TAG_SYM 0x6
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#define TAG_CONS 0x7
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#define UNBOUND ((value_t)0x1) // an invalid value
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#define TAG_FWD UNBOUND
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#define TAG_CONST ((value_t)-2) // in sym->syntax for constants
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#define tag(x) ((x)&0x7)
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#define ptr(x) ((void*)((x)&(~(value_t)0x7)))
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#define tagptr(p,t) (((value_t)(p)) | (t))
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#define fixnum(x) ((value_t)((x)<<2))
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#define numval(x) (((fixnum_t)(x))>>2)
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#ifdef BITS64
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#define fits_fixnum(x) (((x)>>61) == 0 || (~((x)>>61)) == 0)
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#else
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#define fits_fixnum(x) (((x)>>29) == 0 || (~((x)>>29)) == 0)
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#endif
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#define fits_bits(x,b) (((x)>>(b-1)) == 0 || (~((x)>>(b-1))) == 0)
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#define uintval(x) (((unsigned int)(x))>>3)
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#define builtin(n) tagptr((((int)n)<<3), TAG_BUILTIN)
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#define iscons(x) (tag(x) == TAG_CONS)
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#define issymbol(x) (tag(x) == TAG_SYM)
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#define isfixnum(x) (((x)&3) == TAG_NUM)
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#define bothfixnums(x,y) ((((x)|(y))&3) == TAG_NUM)
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#define isbuiltin(x) ((tag(x) == TAG_BUILTIN) && uintval(x) < N_BUILTINS)
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#define isbuiltinish(x) (tag(x) == TAG_BUILTIN)
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#define isvector(x) (tag(x) == TAG_VECTOR)
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#define iscvalue(x) (tag(x) == TAG_CVALUE)
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#define selfevaluating(x) (tag(x)<6)
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// comparable with ==
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#define eq_comparable(a,b) (!(((a)|(b))&1))
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#define eq_comparablep(a) (!((a)&1))
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// doesn't lead to other values
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#define leafp(a) (((a)&3) != 3)
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#define isforwarded(v) (((value_t*)ptr(v))[0] == TAG_FWD)
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#define forwardloc(v) (((value_t*)ptr(v))[1])
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#define forward(v,to) do { (((value_t*)ptr(v))[0] = TAG_FWD); \
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(((value_t*)ptr(v))[1] = to); } while (0)
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#define vector_size(v) (((size_t*)ptr(v))[0]>>2)
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#define vector_setsize(v,n) (((size_t*)ptr(v))[0] = ((n)<<2))
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#define vector_elt(v,i) (((value_t*)ptr(v))[1+(i)])
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#define vector_grow_amt(x) ((x)<8 ? 4 : 6*((x)>>3))
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// functions ending in _ are unsafe, faster versions
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#define car_(v) (((cons_t*)ptr(v))->car)
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#define cdr_(v) (((cons_t*)ptr(v))->cdr)
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#define car(v) (tocons((v),"car")->car)
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#define cdr(v) (tocons((v),"cdr")->cdr)
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#define set(s, v) (((symbol_t*)ptr(s))->binding = (v))
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#define setc(s, v) do { ((symbol_t*)ptr(s))->syntax = TAG_CONST; \
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((symbol_t*)ptr(s))->binding = (v); } while (0)
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#define isconstant(s) (((symbol_t*)ptr(s))->syntax == TAG_CONST)
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#define symbol_value(s) (((symbol_t*)ptr(s))->binding)
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#define ismanaged(v) ((((unsigned char*)ptr(v)) >= fromspace) && \
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(((unsigned char*)ptr(v)) < fromspace+heapsize))
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#define isgensym(x) (issymbol(x) && ismanaged(x))
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extern value_t Stack[];
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extern uint32_t SP;
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#define PUSH(v) (Stack[SP++] = (v))
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#define POP() (Stack[--SP])
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#define POPN(n) (SP-=(n))
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enum {
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// special forms
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F_QUOTE=0, F_COND, F_IF, F_AND, F_OR, F_WHILE, F_LAMBDA,
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F_TRYCATCH, F_SPECIAL_APPLY, F_SETQ, F_PROGN,
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// functions
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F_EQ, F_ATOM, F_NOT, F_SYMBOLP, F_NUMBERP, F_BOUNDP, F_CONSP,
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F_BUILTINP, F_VECTORP, F_FIXNUMP, F_EQUAL,
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F_CONS, F_CAR, F_CDR, F_RPLACA, F_RPLACD,
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F_EVAL, F_EVALSTAR, F_APPLY, F_PROG1, F_RAISE,
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F_ADD, F_SUB, F_MUL, F_DIV, F_LT, F_BNOT, F_BAND, F_BOR, F_BXOR,
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F_VECTOR, F_AREF, F_ASET, F_LENGTH, F_ASSOC, F_COMPARE, F_FOR,
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N_BUILTINS
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};
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#define isspecial(v) (uintval(v) <= (unsigned int)F_PROGN)
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extern value_t NIL, T;
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/* read, eval, print main entry points */
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value_t read_sexpr(ios_t *f);
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void print(ios_t *f, value_t v, int princ);
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value_t toplevel_eval(value_t expr);
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value_t apply(value_t f, value_t l);
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value_t load_file(char *fname);
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/* object model manipulation */
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value_t fl_cons(value_t a, value_t b);
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value_t list2(value_t a, value_t b);
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value_t listn(size_t n, ...);
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value_t symbol(char *str);
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value_t fl_gensym();
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char *symbol_name(value_t v);
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value_t alloc_vector(size_t n, int init);
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size_t llength(value_t v);
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value_t list_nth(value_t l, size_t n);
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value_t compare(value_t a, value_t b); // -1, 0, or 1
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value_t equal(value_t a, value_t b); // T or nil
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uptrint_t hash(value_t a);
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value_t fl_hash(value_t *args, u_int32_t nargs);
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/* safe casts */
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cons_t *tocons(value_t v, char *fname);
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symbol_t *tosymbol(value_t v, char *fname);
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fixnum_t tofixnum(value_t v, char *fname);
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char *tostring(value_t v, char *fname);
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/* error handling */
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void lerror(value_t e, char *format, ...) __attribute__ ((__noreturn__));
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void raise(value_t e) __attribute__ ((__noreturn__));
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void type_error(char *fname, char *expected, value_t got) __attribute__ ((__noreturn__));
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void bounds_error(char *fname, value_t arr, value_t ind) __attribute__ ((__noreturn__));
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extern value_t ArgError, IOError;
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static inline void argcount(char *fname, int nargs, int c)
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{
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if (nargs != c)
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lerror(ArgError,"%s: too %s arguments", fname, nargs<c ? "few":"many");
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}
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/* c interface */
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#define INL_SIZE_NBITS 16
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typedef struct {
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unsigned two:2;
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unsigned unused0:1;
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unsigned numtype:4;
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unsigned inllen:INL_SIZE_NBITS;
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unsigned cstring:1;
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unsigned unused1:4;
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unsigned prim:1;
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unsigned inlined:1;
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unsigned islispfunction:1;
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unsigned autorelease:1;
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#ifdef BITS64
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unsigned pad:32;
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#endif
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} cvflags_t;
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// initial flags have two==0x2 (type tag) and numtype==0xf
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#ifdef BITFIELD_BIG_ENDIAN
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# ifdef BITS64
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# define INITIAL_FLAGS 0x9e00000000000000UL
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# else
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# define INITIAL_FLAGS 0x9e000000
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# endif
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#else
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# ifdef BITS64
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# define INITIAL_FLAGS 0x000000000000007aUL
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# else
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# define INITIAL_FLAGS 0x0000007a
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# endif
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#endif
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typedef struct {
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void (*print)(value_t self, ios_t *f, int princ);
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void (*relocate)(value_t old, value_t new);
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void (*finalize)(value_t self);
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void (*print_traverse)(value_t self);
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} cvtable_t;
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typedef struct {
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union {
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cvflags_t flags;
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unsigned long flagbits;
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};
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value_t type;
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value_t deps;
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//cvtable_t *vtable;
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// fields below are absent in inline-allocated values
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void *data;
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size_t len; // length of *data in bytes
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} cvalue_t;
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#define CVALUE_NWORDS 5
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#define CVALUE_NWORDS_INL 3
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typedef struct {
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union {
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cvflags_t flags;
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unsigned long flagbits;
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};
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value_t type;
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void *data;
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} cprim_t;
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#define CPRIM_NWORDS 3
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#define CPRIM_NWORDS_INL 2
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#define cv_len(c) ((c)->flags.inlined ? (c)->flags.inllen : (c)->len)
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#define cv_type(c) ((c)->type)
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#define cv_numtype(c) ((c)->flags.numtype)
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#define valid_numtype(v) ((v) < N_NUMTYPES)
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/* C type names corresponding to cvalues type names */
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typedef unsigned long ulong;
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typedef unsigned int uint;
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typedef unsigned char uchar;
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typedef char char_t;
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typedef long long_t;
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typedef unsigned long ulong_t;
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typedef double double_t;
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typedef float float_t;
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typedef value_t (*guestfunc_t)(value_t*, uint32_t);
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extern value_t int8sym, uint8sym, int16sym, uint16sym, int32sym, uint32sym;
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extern value_t int64sym, uint64sym, shortsym, ushortsym;
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extern value_t intsym, uintsym, longsym, ulongsym, charsym, ucharsym, wcharsym;
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extern value_t structsym, arraysym, enumsym, cfunctionsym, voidsym, pointersym;
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extern value_t stringtypesym, wcstringtypesym, emptystringsym;
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extern value_t unionsym, floatsym, doublesym, lispvaluesym;
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value_t cvalue(value_t type, size_t sz);
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size_t ctype_sizeof(value_t type, int *palign);
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void *cvalue_data(value_t v);
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void *cv_data(cvalue_t *cv);
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value_t cvalue_copy(value_t v);
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value_t cvalue_from_data(value_t type, void *data, size_t sz);
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value_t cvalue_from_ref(value_t type, void *ptr, size_t sz, value_t parent);
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value_t guestfunc(guestfunc_t f);
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size_t cvalue_arraylen(value_t v);
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value_t size_wrap(size_t sz);
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size_t toulong(value_t n, char *fname);
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value_t cvalue_string(size_t sz);
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value_t cvalue_static_cstring(char *str);
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value_t string_from_cstr(char *str);
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int isstring(value_t v);
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int isnumber(value_t v);
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value_t cvalue_compare(value_t a, value_t b);
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value_t cvalue_char(value_t *args, uint32_t nargs);
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value_t cvalue_wchar(value_t *args, uint32_t nargs);
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value_t mk_double(double_t n);
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value_t mk_float(float_t n);
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value_t mk_uint32(uint32_t n);
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value_t mk_uint64(uint64_t n);
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value_t return_from_uint64(uint64_t Uaccum);
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value_t return_from_int64(int64_t Saccum);
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value_t char_from_code(uint32_t code);
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typedef struct {
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char *name;
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guestfunc_t fptr;
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} builtinspec_t;
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void assign_global_builtins(builtinspec_t *b);
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#endif
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