src/c/builtins.c

   1 /* <Built-in procedures> */
   2
   3 /* Creates a closure and adds it to the top-level
   4    @param name (string) the name of the built-in procedure
   5    @param code (void*) the address of the built-in procedure (label address)
   6 */
   7 #define CREATE_BUILTIN_CLOS(name,code) \
   8     r_res = (int)getSymbol((name),topLevel); /* create a hash bucket */ \
   9     ((SymbolEntry*)r_res)->sob = makeSchemeClosure(NULL,(code)); \
  10     ASSERT_ALWAYS( ((SymbolEntry*)r_res)->sob!=NULL,"" ); \
  11     ((SymbolEntry*)r_res)->isDefined = 1;
  12
  13 /* The stack when in a built-in precedure (there is no fp):
  14   sp -> |      |
  15         | ret  |  - return address
  16         | env  |  - points to the enviroment vector
  17         | n    |  - number of arguments
  18         | A0   |  - argument 0
  19         | A1   |  - argument 1
  20         | ...  |  - ...
  21         | An-1 |  - argument n-1
  22
  23    Macros for built-in procedures:
  24 */
  25 #define BI_ST_ARG(n) (stack[sp-4-(n)])
  26 #define BI_ST_ARG_COUNT() (stack[sp-3])
  27 #define BI_RETURN() goto *pop()
  28
  29     goto Lstart; /* skip all definitions */
  30
  31 Lcar:
  32     ASSERT_ALWAYS( BI_ST_ARG_COUNT()==1,MSG_ERR_ARGCOUNT(1) );
  33     r[0] = BI_ST_ARG(0);
  34     ASSERT_ALWAYS( IS_SOB_PAIR(r[0]), MSG_ERR_NOTPAIR );
  35     r_res = (int)SOB_PAIR_CAR(r[0]);
  36     BI_RETURN();
  37
  38 Lcdr:
  39     ASSERT_ALWAYS( BI_ST_ARG_COUNT()==1,MSG_ERR_ARGCOUNT(1) );
  40     r[0] = BI_ST_ARG(0);
  41     ASSERT_ALWAYS( IS_SOB_PAIR(r[0]), MSG_ERR_NOTPAIR );
  42     r_res = (int)SOB_PAIR_CDR(r[0]);
  43     BI_RETURN();
  44
  45 Lsymbol:
  46     ASSERT_ALWAYS( BI_ST_ARG_COUNT()==1,MSG_ERR_ARGCOUNT(1) );
  47     r[0] = BI_ST_ARG(0);
  48     if ( IS_SOB_SYMBOL(r[0]) ) goto Lsymbol_true;
  49     r_res = (int)&sc_false;
  50     BI_RETURN();
  51 Lsymbol_true:
  52     r_res = (int)&sc_true;
  53     BI_RETURN();
  54
  55 Lset_car:
  56     ASSERT_ALWAYS( BI_ST_ARG_COUNT()==2,MSG_ERR_ARGCOUNT(2) );
  57     r[0] = BI_ST_ARG(0);
  58     r[1] = BI_ST_ARG(1);
  59     ASSERT_ALWAYS( IS_SOB_PAIR(r[0]), MSG_ERR_NOTPAIR );
  60     SOB_PAIR_CAR(r[0]) = (SchemeObject*)r[1];
  61     r_res = r[1];
  62     BI_RETURN();
  63
  64 Lmake_vector:
  65     ASSERT_ALWAYS( BI_ST_ARG_COUNT()>=1,MSG_ERR_ARGCOUNT(1) );
  66     r[0] = BI_ST_ARG(0);
  67     ASSERT_ALWAYS(IS_SOB_INT((SchemeObject*)r[0]), "");
  68     r[0] = SOB_INT_VALUE(r[0]);
  69     r_res = (int)makeSchemeVectorInit(r[0],&sc_void);
  70     /* initialize vector elements
  71     for (int i=1; i<BI_ST_ARG_COUNT(); ++i)
  72         SOB_VECTOR_SET(r_res,i,BI_ST_ARG(i));
  73     */
  74     BI_RETURN();
  75
  76 Lvector_set:
  77     ASSERT_ALWAYS( BI_ST_ARG_COUNT()==3,MSG_ERR_ARGCOUNT(3) );
  78     r[0] = BI_ST_ARG(0);
  79     ASSERT_ALWAYS(IS_SOB_VECTOR((SchemeObject*)r[0]), "");
  80     r[1] = BI_ST_ARG(1);
  81     ASSERT_ALWAYS(IS_SOB_INT((SchemeObject*)r[1]), "");
  82     r[1] = SOB_INT_VALUE((SchemeObject*)r[1]);
  83     r[2] = BI_ST_ARG(2);
  84     SOB_VECTOR_SET((SchemeObject*)r[0],r[1],(SchemeObject*)r[2]);
  85     r_res = (int)&sc_void;
  86     BI_RETURN();
  87
  88 Lvector_ref:
  89     ASSERT_ALWAYS( BI_ST_ARG_COUNT()==2,MSG_ERR_ARGCOUNT(2) );
  90     r[0] = BI_ST_ARG(0);
  91     ASSERT_ALWAYS(IS_SOB_VECTOR((SchemeObject*)r[0]), "");
  92     r[1] = BI_ST_ARG(1);
  93     ASSERT_ALWAYS(IS_SOB_INT((SchemeObject*)r[1]), "");
  94     r[1] = SOB_INT_VALUE((SchemeObject*)r[1]);
  95     r_res = (int)SOB_VECTOR_REF((SchemeObject*)r[0],r[1]);
  96     BI_RETURN();
  97
  98 LbinaryEQ:
  99     ASSERT_ALWAYS( BI_ST_ARG_COUNT()==2,MSG_ERR_ARGCOUNT(2) );
 100     r[0] = BI_ST_ARG(0);
 101     ASSERT_ALWAYS(IS_SOB_INT((SchemeObject*)r[0]), "");
 102     r[0] = SOB_INT_VALUE((SchemeObject*)r[0]);
 103     r[1] = BI_ST_ARG(1);
 104     ASSERT_ALWAYS(IS_SOB_INT((SchemeObject*)r[1]), "");
 105     r[1] = SOB_INT_VALUE((SchemeObject*)r[1]);
 106     if (r[0] != r[1]) goto LbinaryEQ_false;
 107     r_res = (int)&sc_true;
 108     BI_RETURN();
 109 LbinaryEQ_false:
 110     r_res = (int)&sc_false;
 111     BI_RETURN();
 112
 113 LbinaryADD:
 114     ASSERT_ALWAYS( BI_ST_ARG_COUNT()==2,MSG_ERR_ARGCOUNT(2) );
 115     r[0] = BI_ST_ARG(0);
 116     ASSERT_ALWAYS(IS_SOB_INT((SchemeObject*)r[0]), "");
 117     r[0] = SOB_INT_VALUE((SchemeObject*)r[0]);
 118     r[1] = BI_ST_ARG(1);
 119     ASSERT_ALWAYS(IS_SOB_INT((SchemeObject*)r[1]), "");
 120     r[1] = SOB_INT_VALUE((SchemeObject*)r[1]);
 121     r_res = r[0] + r[1];
 122     r_res = (int)makeSchemeInt( r_res );
 123     BI_RETURN();
 124
 125 Lstart:
 126     /* create closures for the free variables of the built-in procedures */
 127     CREATE_BUILTIN_CLOS("car",&&Lcar);
 128     CREATE_BUILTIN_CLOS("cdr",&&Lcdr);
 129     CREATE_BUILTIN_CLOS("symbol?",&&Lsymbol);
 130     CREATE_BUILTIN_CLOS("set-car!",&&Lset_car);
 131     CREATE_BUILTIN_CLOS("make-vector",&&Lmake_vector);
 132     CREATE_BUILTIN_CLOS("vector-set!",&&Lvector_set);
 133     CREATE_BUILTIN_CLOS("vector-ref",&&Lvector_ref);
 134     CREATE_BUILTIN_CLOS("binary=?",&&LbinaryEQ);
 135     CREATE_BUILTIN_CLOS("binary-add",&&LbinaryADD);
 136
 137 /* </Built-in procedures> */