clib/nit_common.h

   1 #ifndef NIT_COMMON_H
   2 #define NIT_COMMON_H
   3
   4 /* This file is part of NIT ( http://www.nitlanguage.org ).
   5  *
   6  * Copyright 2006-2009 Jean Privat <jean@pryen.org>
   7  *
   8  * This file is free software, which comes along with NIT.  This software is
   9  * distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  10  * without  even  the implied warranty of  MERCHANTABILITY or  FITNESS FOR A
  11  * PARTICULAR PURPOSE.  You can modify it is you want,  provided this header
  12  * is kept unaltered, and a notification of the changes is added.
  13  * You  are  allowed  to  redistribute it and sell it, alone or is a part of
  14  * another product.
  15  */
  16
  17 #include <stdlib.h>
  18 #include <stdio.h>
  19 #include <string.h>
  20
  21 #ifdef WITH_LIBGC
  22 #include <gc/gc.h>
  23 #define malloc(x) GC_MALLOC((x))
  24 #define calloc(x,y) GC_MALLOC((x)*(y))
  25 #endif
  26
  27
  28
  29 /* *** Types *** */
  30 typedef signed long int bigint; /* standard int value, must be larger that any poiner */
  31 typedef bigint (*fun_t) (bigint);                                       /* generic function pointer */
  32 typedef bigint cid_t;                                   /* class identifier */
  33 typedef bigint val_t;   /* value (everything is a val_t) */
  34 typedef union obj_tu {union classtable_elt_tu * vft; val_t attr;} *obj_t; /* standard object */
  35 typedef union classtable_elt_tu { bigint i; fun_t f; cid_t cid;} classtable_elt_t;      /* classtable element */
  36
  37 typedef classtable_elt_t * classtable_t;                        /* classtable */
  38
  39 /*****************************************************************************
  40  * Types macros (primitive and less primitives) ******************************
  41  *****************************************************************************
  42  *
  43  * ** types are: **
  44  *
  45  * OBJ  (obj_t) : standard object representation (including boxes + NIL)
  46  * Int  (int)   : integers
  47  * Char (car)   : characters
  48  * Bool (int)   : booleans (true or false)
  49  *
  50  * X    (x_t)   : generic representatio of the previous four types
  51  *
  52  * ** macros are: **
  53  *
  54  * int ISX(val_t v)             : true if v is a X
  55  * x_t VAL2X(val_t v)           : convert a val_t to a primitive type (you should check ISX before)
  56  * val_t X2VAL(x_t x)           : convert a type to a val_t
  57  * int XTAG                     : numeric identifier of a type
  58  * int TAG(val_t v)             : return the XTAG (ie TAG(Char2VAL('e')) == CharTag)
  59  *
  60  * classtable_t VAL2VFT(val_t v): the virtual function table of a value
  61  *
  62  * val_t NIT_NULL               : the instance of the None class
  63  *****************************************************************************/
  64
  65 #define TAG(x) ((int)(x) & 3)
  66 #ifndef IntTAG
  67 #       define IntTAG 1
  68 #endif
  69 #define TAG_Int(x) ((val_t)(((x)<<2)|IntTAG))
  70 #define UNTAG_Int(x) ((bigint)(x)>>2)
  71 #ifndef CharTAG
  72 #       define CharTAG 2
  73 #endif
  74 #define TAG_Char(x) ((val_t)((((int)(x))<<2)|CharTAG))
  75 #define UNTAG_Char(x) ((char)((int)(x)>>2))
  76 #ifndef BoolTAG
  77 #       define BoolTAG 3
  78 #endif
  79 #define TAG_Bool(x) ((val_t)(((x)<<2)|BoolTAG))
  80 #define UNTAG_Bool(x) ((int)(x)>>2)
  81 #ifndef OBJTAG
  82 #       define OBJTAG 0
  83 #endif
  84
  85 #define ISOBJ(x) (TAG((x)) == OBJTAG)
  86 #define VAL2OBJ(x) ((obj_t)(x))
  87 #define OBJ2VAL(o) ((val_t)(o))
  88 #define VAL2VFT(x) (ISOBJ(x) ? VAL2OBJ(x)->vft : TAG2VFT[TAG(x)])
  89 /*#define VAL2CID(x) (ISOBJ(x) ? (VAL2OBJ(x)->vft->cid) : (-TAG(x)))*/
  90 #define VAL2CID(x) (VAL2OBJ(x)->vft->cid)
  91
  92 #define NIT_NULL ((val_t)0)
  93 #define ISNULL(x) ((x)==NIT_NULL)
  94
  95 /* Equal comparaison */
  96 /* O = Non nil object ; N = Object or nil ; P = Primitive */
  97 #define OBJ_IS_BOX(x) ((VAL2OBJ(x)->vft->i) < 0)
  98 #define IS_BOX(x) (ISOBJ(x) && OBJ_IS_BOX(x))
  99 #define IS_EQUAL_BOX(x, y) (ISOBJ(y) && (VAL2OBJ(x)[1].vft==VAL2OBJ(y)[1].vft) && (VAL2OBJ(x)->vft==VAL2OBJ(y)->vft))
 100 #define IS_EQUAL_OO(x, y) ((x)==(y) || (IS_BOX(x) && IS_EQUAL_BOX((x), (y))))
 101 #define IS_EQUAL_ON(x, y) ((x)==(y) || (IS_BOX(x) && !ISNULL(y) && IS_EQUAL_BOX((x), (y))))
 102 #define IS_EQUAL_NN(x, y) ((x)==(y) || (!ISNULL(x) && IS_BOX(x) && !ISNULL(y) && IS_EQUAL_BOX((x), (y))))
 103
 104 /* Subclass comparaison */
 105 /* check is e is a subtype of c2 */
 106 /* Warning, only subclasse comparaison is performed, not subtype */
 107 /* e is a val (not nil) */
 108 /* c a class name (eg: Int) */
 109 #define VALISA(e, c) (VAL2VFT(e)[COLOR_ ## c].cid == (cid_t) ID_ ## c)
 110 #define OBJISA(e, c) (VAL2OBJ(e)->vft[COLOR_ ## c].cid == (cid_t) ID_ ## c)
 111
 112 #define VAL_ISA(e, c, i) (VAL2VFT((e))[(c)].cid == (cid_t)(i))
 113
 114 void * alloc(size_t);
 115 extern val_t G_args;
 116 extern val_t G_stdin;
 117 extern val_t G_stdout;
 118 extern val_t G_stderr;
 119 extern val_t G_sys;
 120
 121 extern int glob_argc;
 122 extern char ** glob_argv;
 123
 124 struct trace_t {
 125         struct trace_t *prev; /* previous stack frame */
 126         const char *file; /* source filename */
 127         int line; /* line number */
 128         const char *meth; /* method name */
 129 };
 130 extern struct trace_t *tracehead;
 131 typedef enum {true = (1==1),false = (0==1)} bool;
 132
 133 void nit_exit(int);
 134
 135 #define CALL(r,c) ((VAL2VFT(r)[c].f))
 136 #define ATTR(r,c) (*(val_t*)(VAL2OBJ(r)+c))
 137 #define ATTRS(r,c,o) ((VAL2OBJ(r)+VAL2VFT(r)[c].i)[o].attr)
 138
 139 void prepare_signals(void);
 140 extern classtable_t TAG2VFT[4];
 141
 142 /* This structure is used to store closure.
 143  * Specific closure use a specific fun parameter.
 144  */
 145 struct WBT_ {fun_t fun; val_t *has_broke; val_t broke_value; val_t *variable; struct WBT_ **closurevariable;};
 146 #endif