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revision 1.2 by masse, Sun Feb 17 04:03:57 2002 UTC revision 1.10 by masse, Sun Mar 10 20:08:47 2002 UTC
# Line 1  Line 1 
1    /*
2        stack - an interactive interpreter for a stack-based language
3        Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn
4    
5        This program is free software; you can redistribute it and/or modify
6        it under the terms of the GNU General Public License as published by
7        the Free Software Foundation; either version 2 of the License, or
8        (at your option) any later version.
9    
10        This program is distributed in the hope that it will be useful,
11        but WITHOUT ANY WARRANTY; without even the implied warranty of
12        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13        GNU General Public License for more details.
14    
15        You should have received a copy of the GNU General Public License
16        along with this program; if not, write to the Free Software
17        Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18    
19        Authors: Mats Alritzson <masse@fukt.bth.se>
20                 Teddy Hogeborn <teddy@fukt.bth.se>
21    */
22    
23  #define HASHTBLSIZE 2048  #define HASHTBLSIZE 2048
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 {
32      integer,      integer,
33        tfloat,
34      string,      string,
35      func,                       /* Function pointer */      func,                       /* Function pointer */
36      symb,      symb,
37      list      tcons
38    } type:3;                     /* Type of stack element */    } type:4;                     /* Type of stack element */
39    
40    int gc_garb:1;    union {
41        struct {
42          unsigned int mark:1;
43          unsigned int protect:1;
44        } flag;
45        unsigned int no_gc:2;
46      } 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 val;                    /* ...or an integer */      int i;                      /* ...or an integer */
52        float f;
53    } content;                    /* Stores a pointer or an integer */    } content;                    /* Stores a pointer or an integer */
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 34  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 */
92    char *free_string;            /* Free this string when all input is    char *free_string;            /* Free this string when all input is
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  } environment;  } environment;
# Line 68  extern void toss(environment*); Line 105  extern void toss(environment*);
105  symbol **hash(hashtbl, const char*);  symbol **hash(hashtbl, const char*);
106  value* new_val(environment*);  value* new_val(environment*);
107  void gc_mark(value*);  void gc_mark(value*);
108    void gc_maybe(environment *env);
109  extern void gc_init(environment*);  extern void gc_init(environment*);
110  void push_val(environment*, value*);  void push_val(environment*, value*);
111  void push_int(environment*, int);  void push_int(environment*, int);
112    void push_float(environment*, float);
113  void push_cstring(environment*, const char*);  void push_cstring(environment*, const char*);
114  char *mangle_str(const char*);  char *mangle_str(const char*);
115  extern void mangle(environment*);  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*);
# Line 114  extern void to(environment*); Line 153  extern void to(environment*);
153  extern void readline(environment*);  extern void readline(environment*);
154  extern void sx_72656164(environment*);  extern void sx_72656164(environment*);
155  extern void foreach(environment*);  extern void foreach(environment*);
156    void protect(value*);
157    void unprotect(value*);
158    extern void copying(environment*);
159    extern void warranty(environment*);
160    extern void sx_2a(environment*);
161    extern void sx_2f(environment*);
162    extern void mod(environment*);
163    extern void sx_3c(environment*);
164    extern void sx_3c3d(environment*);
165    extern void sx_3e3d(environment*);
166    extern void sx_646976(environment*);
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