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; bigint object_id; val_t objectSize;} *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 extern bigint object_id_counter;
  40
  41 /*****************************************************************************
  42  * Types macros (primitive and less primitives) ******************************
  43  *****************************************************************************
  44  *
  45  * ** types are: **
  46  *
  47  * OBJ  (obj_t) : standard object representation (including boxes + NIL)
  48  * Int  (int)   : integers
  49  * Char (car)   : characters
  50  * Bool (int)   : booleans (true or false)
  51  *
  52  * X    (x_t)   : generic representatio of the previous four types
  53  *
  54  * ** macros are: **
  55  *
  56  * int ISX(val_t v)             : true if v is a X
  57  * x_t VAL2X(val_t v)           : convert a val_t to a primitive type (you should check ISX before)
  58  * val_t X2VAL(x_t x)           : convert a type to a val_t
  59  * int XTAG                     : numeric identifier of a type
  60  * int TAG(val_t v)             : return the XTAG (ie TAG(Char2VAL('e')) == CharTag)
  61  *
  62  * classtable_t VAL2VFT(val_t v): the virtual function table of a value
  63  *
  64  * val_t NIT_NULL               : the instance of the None class
  65  *****************************************************************************/
  66
  67 #define TAG(x) ((int)(x) & 3)
  68 #ifndef IntTAG
  69 #       define IntTAG 1
  70 #endif
  71 #define TAG_Int(x) ((val_t)(((x)<<2)|IntTAG))
  72 #define UNTAG_Int(x) ((bigint)(x)>>2)
  73 #ifndef CharTAG
  74 #       define CharTAG 2
  75 #endif
  76 #define TAG_Char(x) ((val_t)((((int)(x))<<2)|CharTAG))
  77 #define UNTAG_Char(x) ((char)((int)(x)>>2))
  78 #ifndef BoolTAG
  79 #       define BoolTAG 3
  80 #endif
  81 #define TAG_Bool(x) ((val_t)(((x)<<2)|BoolTAG))
  82 #define UNTAG_Bool(x) ((int)(x)>>2)
  83 #ifndef OBJTAG
  84 #       define OBJTAG 0
  85 #endif
  86
  87 #define ISOBJ(x) (TAG((x)) == OBJTAG)
  88 #define VAL2OBJ(x) ((obj_t)(x))
  89 #define OBJ2VAL(o) ((val_t)(o))
  90 #define VAL2VFT(x) (ISOBJ(x) ? VAL2OBJ(x)->vft : TAG2VFT[TAG(x)])
  91 /*#define VAL2CID(x) (ISOBJ(x) ? (VAL2OBJ(x)->vft->cid) : (-TAG(x)))*/
  92 #define VAL2CID(x) (VAL2OBJ(x)->vft->cid)
  93
  94 #define NIT_NULL ((val_t)0)
  95 #define ISNULL(x) ((x)==NIT_NULL)
  96
  97 /* Equal comparaison */
  98 /* O = Non nil object ; N = Object or nil ; P = Primitive */
  99 #define OBJ_IS_BOX(x) ((VAL2OBJ(x)->vft->i) < 0)
 100 #define IS_BOX(x) (ISOBJ(x) && OBJ_IS_BOX(x))
 101 #define IS_EQUAL_BOX(x, y) (ISOBJ(y) && (VAL2OBJ(x)[2].vft==VAL2OBJ(y)[2].vft) && (VAL2OBJ(x)->vft==VAL2OBJ(y)->vft))
 102 #define IS_EQUAL_OO(x, y) ((x)==(y) || (IS_BOX(x) && IS_EQUAL_BOX((x), (y))))
 103 #define IS_EQUAL_ON(x, y) ((x)==(y) || (IS_BOX(x) && !ISNULL(y) && IS_EQUAL_BOX((x), (y))))
 104 #define IS_EQUAL_NN(x, y) ((x)==(y) || (!ISNULL(x) && IS_BOX(x) && !ISNULL(y) && IS_EQUAL_BOX((x), (y))))
 105
 106 /* Subclass comparaison */
 107 /* check is e is a subtype of c2 */
 108 /* Warning, only subclasse comparaison is performed, not subtype */
 109 /* e is a val (not nil) */
 110 /* c a class name (eg: Int) */
 111 #define VALISA(e, c) (VAL2VFT(e)[COLOR_ ## c].cid == (cid_t) ID_ ## c)
 112 #define OBJISA(e, c) (VAL2OBJ(e)->vft[COLOR_ ## c].cid == (cid_t) ID_ ## c)
 113
 114 #define VAL_ISA(e, c, i) (VAL2VFT((e))[(c)].cid == (cid_t)(i))
 115
 116 void * alloc(size_t);
 117 extern val_t G_args;
 118 extern val_t G_stdin;
 119 extern val_t G_stdout;
 120 extern val_t G_stderr;
 121 extern val_t G_sys;
 122
 123 extern int glob_argc;
 124 extern char ** glob_argv;
 125
 126 struct trace_t {
 127         struct trace_t *prev; /* previous stack frame */
 128         const char *file; /* source filename */
 129         int line; /* line number */
 130         const char *meth; /* method name */
 131 };
 132 extern struct trace_t *tracehead;
 133 typedef enum {true = (1==1),false = (0==1)} bool;
 134
 135 void nit_exit(int);
 136
 137 #define CALL(r,c) ((VAL2VFT(r)[c].f))
 138 #define ATTR(r,c) (*(val_t*)(VAL2OBJ(r)+c))
 139 #define ATTRS(r,c,o) ((VAL2OBJ(r)+VAL2VFT(r)[c].i)[o].attr)
 140
 141 void prepare_signals(void);
 142 extern classtable_t TAG2VFT[4];
 143
 144 /* This structure is used to store closure.
 145  * Specific closure use a specific fun parameter.
 146  */
 147 struct WBT_ {fun_t fun; val_t *has_broke; val_t broke_value; val_t *variable; struct WBT_ **closurevariable;};
 148 #endif