/[cvs]/stack/stack.h
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revision 1.12 by masse, Tue Mar 12 14:06:05 2002 UTC revision 1.16 by teddy, Sun Mar 17 11:26:35 2002 UTC
# Line 25  Line 25 
25  /* First, define some types. */  /* First, define some types. */
26    
27  struct cons_struct;  struct cons_struct;
28    struct symbol_struct;
29    
30  /* A value of some type */  /* A value of some type */
31  typedef struct {  typedef struct {
32    enum {    enum {
33        empty,                      /* The empty list */
34      integer,      integer,
35      tfloat,      tfloat,
36      string,      string,
# Line 48  typedef struct { Line 50  typedef struct {
50    union {    union {
51      void *ptr;                  /* Pointer to the content */      void *ptr;                  /* Pointer to the content */
52      struct cons_struct *c;      /* ...or a pointer to a cons cell */      struct cons_struct *c;      /* ...or a pointer to a cons cell */
53        struct symbol_struct *sym;  /* ...or a pointer to a symbol */
54      int i;                      /* ...or an integer */      int i;                      /* ...or an integer */
55      float f;                    /* ...or a floating point number */      float f;                    /* ...or a floating point number */
56    } content;                    /* Stores a pointer or an integer */    } content;                    /* Stores a pointer or an integer */
# Line 65  typedef struct stackitem_struct Line 68  typedef struct stackitem_struct
68  typedef struct cons_struct {    /* A pair of two values */  typedef struct cons_struct {    /* A pair of two values */
69    value *car;    value *car;
70    value *cdr;    value *cdr;
71  } cons;  } pair;
72    
73  /* A symbol with a name and possible value */  /* A symbol with a name and possible value */
74  /* (These do not need reference counters, they are kept unique by  /* (These do not need reference counters, they are kept unique by
# Line 82  typedef symbol *hashtbl[HASHTBLSIZE]; /* Line 85  typedef symbol *hashtbl[HASHTBLSIZE]; /*
85  /* An environment; gives access to the stack and a hash table of  /* An environment; gives access to the stack and a hash table of
86     defined symbols */     defined symbols */
87  typedef struct {  typedef struct {
   stackitem *gc_ref;  
   int gc_limit, gc_count;  
   
88    value *head;                  /* Head of the stack */    value *head;                  /* Head of the stack */
89    hashtbl symbols;              /* Hash table of all variable bindings */    hashtbl symbols;              /* Hash table of all variable bindings */
90    int err;                      /* Error flag */    int err;                      /* Error flag */
# Line 93  typedef struct { Line 93  typedef struct {
93                                     read from in_string */                                     read from in_string */
94    FILE *inputstream;            /* stdin or a file, most likely */    FILE *inputstream;            /* stdin or a file, most likely */
95    int interactive;              /* print prompts, stack, etc */    int interactive;              /* print prompts, stack, etc */
96    
97      /* Garbage Collector stuff*/
98      stackitem *gc_ref;            /* Stack of all allocated values */
99      int gc_limit;                 /* Run GC when this much is allocated */
100      int gc_count;                 /* Amount currently allocated */
101  } environment;  } environment;
102    
103  /* A type for pointers to external functions */  /* A type for pointers to external functions */
# Line 164  extern void sx_3c(environment*); Line 169  extern void sx_3c(environment*);
169  extern void sx_3c3d(environment*);  extern void sx_3c3d(environment*);
170  extern void sx_3e3d(environment*);  extern void sx_3e3d(environment*);
171  extern void sx_646976(environment*);  extern void sx_646976(environment*);
172    extern void then(environment*);
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