/[cvs]/stack/stack.h
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revision 1.8 by masse, Sun Mar 10 09:13:36 2002 UTC revision 1.15 by teddy, Sat Mar 16 19:09:54 2002 UTC
# Line 24  Line 24 
24    
25  /* First, define some types. */  /* First, define some types. */
26    
27    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,
37      func,                       /* Function pointer */      func,                       /* Function pointer */
38      symb,      symb,                       /* Symbol */
39      list      tcons                       /* A pair of two values */
40    } type:4;                     /* Type of stack element */    } type:4;                     /* Type of stack element */
41    
42    int gc_garb:1;    union {
43    int gc_protect:1;      struct {
44          unsigned int mark:1;      /* Used internally in the GC */
45          unsigned int protect:1;   /* Protect from GC */
46        } flag;
47        unsigned int no_gc:2;       /* Both flags as one integer */
48      } gc;                         /* Garbage collector stuff */
49    
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 */
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;      float f;                    /* ...or a floating point number */
56    } content;                    /* Stores a pointer or an integer */    } content;                    /* Stores a pointer or an integer */
57    
58  } value;  } value;
59    
60    /* An item (value) on a stack */
61    typedef struct stackitem_struct
62    {
63      value *item;                 /* The value on the stack */
64                                   /* (This is never NULL) */
65      struct stackitem_struct *next; /* Next item */
66    } stackitem;
67    
68    typedef struct cons_struct {    /* A pair of two values */
69      value *car;
70      value *cdr;
71    } cons;
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
75     hashing.) */     hashing.) */
# Line 58  typedef struct symbol_struct { Line 82  typedef struct symbol_struct {
82  /* A type for a hash table for symbols */  /* A type for a hash table for symbols */
83  typedef symbol *hashtbl[HASHTBLSIZE]; /* Hash table declaration */  typedef symbol *hashtbl[HASHTBLSIZE]; /* Hash table declaration */
84    
 /* 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;  
   
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 {
88    stackitem *gc_ref;    value *head;                  /* Head of the stack */
   int gc_limit, gc_count;  
   
   stackitem *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 80  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 103  extern void mangle(environment*); Line 121  extern void mangle(environment*);
121  void push_sym(environment*, const char*);  void push_sym(environment*, const char*);
122  extern void nl();  extern void nl();
123  extern void type(environment*);  extern void type(environment*);
124  void print_h(stackitem*, int);  void print_h(value*, int);
125  extern void print_(environment*);  extern void print_(environment*);
126  extern void print(environment*);  extern void print(environment*);
127  extern void princ_(environment*);  extern void princ_(environment*);
128  extern void princ(environment*);  extern void princ(environment*);
129  void print_st(stackitem*, long);  void print_st(value*, long);
130  extern void printstack(environment*);  extern void printstack(environment*);
131  extern void swap(environment*);  extern void swap(environment*);
132  extern void rot(environment*);  extern void rot(environment*);
# Line 151  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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