lib/nit_common.h

   1 #ifndef NIT_COMMON_H
   2 #define NIT_COMMON_H
   3
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <string.h>
   7
   8 #ifdef WITH_LIBGC
   9 #include <gc/gc.h>
  10 #define malloc(x) GC_MALLOC((x))
  11 #define calloc(x,y) GC_MALLOC((x)*(y))
  12 #endif
  13
  14
  15
  16 /* *** Types *** */
  17 typedef signed long int bigint; /* standard int value, must be larger that any poiner */
  18 typedef bigint (*fun_t) (bigint);                                       /* generic function pointer */
  19 typedef bigint cid_t;                                   /* class identifier */
  20 typedef bigint val_t;   /* value (everything is a val_t) */
  21 typedef union obj_tu {union classtable_elt_tu * vft; val_t attr;} *obj_t; /* standard object */
  22 typedef union classtable_elt_tu { bigint i; fun_t f; cid_t cid;} classtable_elt_t;      /* classtable element */
  23
  24 typedef classtable_elt_t * classtable_t;                        /* classtable */
  25
  26 /*****************************************************************************
  27  * Types macros (primitive and less primitives) ******************************
  28  *****************************************************************************
  29  *
  30  * ** types are: **
  31  *
  32  * OBJ  (obj_t) : standard object representation (including boxes + NIL)
  33  * Int  (int)   : integers
  34  * Char (car)   : characters
  35  * Bool (int)   : booleans (true or false)
  36  *
  37  * X    (x_t)   : generic representatio of the previous four types
  38  *
  39  * ** macros are: **
  40  *
  41  * int ISX(val_t v)             : true if v is a X
  42  * x_t VAL2X(val_t v)           : convert a val_t to a primitive type (you should check ISX before)
  43  * val_t X2VAL(x_t x)           : convert a type to a val_t
  44  * int XTAG                     : numeric identifier of a type
  45  * int TAG(val_t v)             : return the XTAG (ie TAG(Char2VAL('e')) == CharTag)
  46  *
  47  * classtable_t VAL2VFT(val_t v): the virtual function table of a value
  48  *
  49  * val_t NIT_NULL               : the instance of the None class
  50  *****************************************************************************/
  51
  52 #define TAG(x) ((int)(x) & 3)
  53 #ifndef IntTAG
  54 #       define IntTAG 1
  55 #endif
  56 #define TAG_Int(x) ((val_t)(((x)<<2)|IntTAG))
  57 #define UNTAG_Int(x) ((bigint)(x)>>2)
  58 #ifndef CharTAG
  59 #       define CharTAG 2
  60 #endif
  61 #define TAG_Char(x) ((val_t)((((int)(x))<<2)|CharTAG))
  62 #define UNTAG_Char(x) ((char)((int)(x)>>2))
  63 #ifndef BoolTAG
  64 #       define BoolTAG 3
  65 #endif
  66 #define TAG_Bool(x) ((val_t)(((x)<<2)|BoolTAG))
  67 #define UNTAG_Bool(x) ((int)(x)>>2)
  68 #ifndef OBJTAG
  69 #       define OBJTAG 0
  70 #endif
  71
  72 #define ISOBJ(x) (TAG((x)) == OBJTAG)
  73 #define VAL2OBJ(x) ((obj_t)(x))
  74 #define OBJ2VAL(o) ((val_t)(o))
  75 #define VAL2VFT(x) (ISOBJ(x) ? VAL2OBJ(x)->vft : TAG2VFT[TAG(x)])
  76 /*#define VAL2CID(x) (ISOBJ(x) ? (VAL2OBJ(x)->vft->cid) : (-TAG(x)))*/
  77 #define VAL2CID(x) (VAL2OBJ(x)->vft->cid)
  78
  79 #define NIT_NULL ((val_t)0)
  80 #define ISNULL(x) ((x)==NIT_NULL)
  81
  82 /* Equal comparaison */
  83 /* O = Non nil object ; N = Object or nil ; P = Primitive */
  84 #define OBJ_IS_BOX(x) ((VAL2OBJ(x)->vft->i) < 0)
  85 #define IS_BOX(x) (ISOBJ(x) && OBJ_IS_BOX(x))
  86 #define IS_EQUAL_BOX(x, y) (ISOBJ(y) && (VAL2OBJ(x)[1].vft==VAL2OBJ(y)[1].vft) && (VAL2OBJ(x)->vft==VAL2OBJ(y)->vft))
  87 #define IS_EQUAL_OO(x, y) ((x)==(y) || (IS_BOX(x) && IS_EQUAL_BOX((x), (y))))
  88 #define IS_EQUAL_ON(x, y) ((x)==(y) || (IS_BOX(x) && !ISNULL(y) && IS_EQUAL_BOX((x), (y))))
  89 #define IS_EQUAL_NN(x, y) ((x)==(y) || (!ISNULL(x) && IS_BOX(x) && !ISNULL(y) && IS_EQUAL_BOX((x), (y))))
  90
  91 /* Subclass comparaison */
  92 /* check is e is a subtype of c2 */
  93 /* Warning, only subclasse comparaison is performed, not subtype */
  94 /* e is a val (not nil) */
  95 /* c a class name (eg: Int) */
  96 #define VALISA(e, c) (VAL2VFT(e)[COLOR_ ## c].cid == (cid_t) ID_ ## c)
  97 #define OBJISA(e, c) (VAL2OBJ(e)->vft[COLOR_ ## c].cid == (cid_t) ID_ ## c)
  98
  99 #define VAL_ISA(e, c, i) (VAL2VFT((e))[(c)].cid == (cid_t)(i))
 100
 101 void * alloc(size_t);
 102 extern val_t G_args;
 103 extern val_t G_stdin;
 104 extern val_t G_stdout;
 105 extern val_t G_stderr;
 106 extern val_t G_sys;
 107
 108 extern int glob_argc;
 109 extern char ** glob_argv;
 110
 111 struct trace_t {
 112         struct trace_t *prev; /* previous stack frame */
 113         const char *file; /* source filename */
 114         int line; /* line number */
 115         const char *meth; /* method name */
 116 };
 117 extern struct trace_t *tracehead;
 118 typedef enum {true = (1==1),false = (0==1)} bool;
 119
 120 void nit_exit(int);
 121
 122 #define CALL(r,c) ((VAL2VFT(r)[c].f))
 123 #define ATTR(r,c) (*(val_t*)(VAL2OBJ(r)+c))
 124 #define ATTRS(r,c,o) ((VAL2OBJ(r)+VAL2VFT(r)[c].i)[o].attr)
 125
 126 void prepare_signals(void);
 127 extern classtable_t TAG2VFT[4];
 128
 129 /* This structure is used to store closure.
 130  * Specific closure use a specific fun parameter.
 131  */
 132 struct WBT_ {fun_t fun; val_t *has_broke; val_t broke_value; val_t *variable; struct WBT_ **closurevariable;};
 133 #endif