/[cvs]/stack/stack.h
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Diff of /stack/stack.h

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revision 1.9 by teddy, Sun Mar 10 10:06:36 2002 UTC revision 1.10 by masse, Sun Mar 10 20:08:47 2002 UTC
# Line 24  Line 24 
24    
25  /* First, define some types. */  /* First, define some types. */
26    
27    struct cons_struct;
28    
29  /* A value of some type */  /* A value of some type */
30  typedef struct {  typedef struct {
31    enum {    enum {
# Line 32  typedef struct { Line 34  typedef struct {
34      string,      string,
35      func,                       /* Function pointer */      func,                       /* Function pointer */
36      symb,      symb,
37      list      tcons
38    } type:4;                     /* Type of stack element */    } type:4;                     /* Type of stack element */
39    
40    union {    union {
# Line 44  typedef struct { Line 46  typedef struct {
46    } gc;    } gc;
47    
48    union {    union {
49        struct cons_struct *c;
50      void *ptr;                  /* Pointer to the content */      void *ptr;                  /* Pointer to the content */
51      int i;                      /* ...or an integer */      int i;                      /* ...or an integer */
52      float f;      float f;
# Line 51  typedef struct { Line 54  typedef struct {
54    
55  } value;  } value;
56    
57    /* An item (value) on a stack */
58    typedef struct stackitem_struct
59    {
60      value *item;                 /* The value on the stack */
61                                   /* (This is never NULL) */
62      struct stackitem_struct *next; /* Next item */
63    } stackitem;
64    
65    typedef struct cons_struct {
66      value *car;
67      value *cdr;
68    } cons;
69    
70  /* A symbol with a name and possible value */  /* A symbol with a name and possible value */
71  /* (These do not need reference counters, they are kept unique by  /* (These do not need reference counters, they are kept unique by
72     hashing.) */     hashing.) */
# Line 63  typedef struct symbol_struct { Line 79  typedef struct symbol_struct {
79  /* A type for a hash table for symbols */  /* A type for a hash table for symbols */
80  typedef symbol *hashtbl[HASHTBLSIZE]; /* Hash table declaration */  typedef symbol *hashtbl[HASHTBLSIZE]; /* Hash table declaration */
81    
 /* An item (value) on a stack */  
 typedef struct stackitem_struct  
 {  
   value *item;                  /* The value on the stack */  
                                 /* (This is never NULL) */  
   struct stackitem_struct *next; /* Next item */  
 } stackitem;  
   
82  /* An environment; gives access to the stack and a hash table of  /* An environment; gives access to the stack and a hash table of
83     defined symbols */     defined symbols */
84  typedef struct {  typedef struct {
85    stackitem *gc_ref;    stackitem *gc_ref;
86    int gc_limit, gc_count;    int gc_limit, gc_count;
87    
88    stackitem *head;              /* Head of the stack */    cons *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 */
91    char *in_string;              /* Input pending to be read */    char *in_string;              /* Input pending to be read */
# Line 108  extern void mangle(environment*); Line 116  extern void mangle(environment*);
116  void push_sym(environment*, const char*);  void push_sym(environment*, const char*);
117  extern void nl();  extern void nl();
118  extern void type(environment*);  extern void type(environment*);
119  void print_h(stackitem*, int);  void print_h(cons*, int);
120  extern void print_(environment*);  extern void print_(environment*);
121  extern void print(environment*);  extern void print(environment*);
122  extern void princ_(environment*);  extern void princ_(environment*);
123  extern void princ(environment*);  extern void princ(environment*);
124  void print_st(stackitem*, long);  void print_st(cons*, long);
125  extern void printstack(environment*);  extern void printstack(environment*);
126  extern void swap(environment*);  extern void swap(environment*);
127  extern void rot(environment*);  extern void rot(environment*);
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