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revision 1.2 by masse, Sun Feb 17 04:03:57 2002 UTC revision 1.28 by masse, Mon Aug 18 14:39:16 2003 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    #define CAR(X) ((X)->content.c->car)
26    #define CDR(X) ((X)->content.c->cdr)
27    
28    /* printf, sscanf, fgets, fprintf, fopen, perror */
29    #include <stdio.h>
30    /* exit, EXIT_SUCCESS, malloc, free */
31    #include <stdlib.h>
32    /* NULL */
33    #include <stddef.h>
34    /* dlopen, dlsym, dlerror */
35    #include <dlfcn.h>
36    /* strcmp, strcpy, strlen, strcat, strdup */
37    #include <string.h>
38    /* getopt, STDIN_FILENO, STDOUT_FILENO, usleep */
39    #include <unistd.h>
40    /* EX_NOINPUT, EX_USAGE */
41    #include <sysexits.h>
42    /* assert */
43    #include <assert.h>
44    /* waitpid */
45    #include <sys/wait.h>
46    /* va_list, va_start, va_arg, va_end */
47    #include <stdarg.h>
48    /* time */
49    #include <time.h>
50    
51    #ifdef __linux__
52    /* mtrace, muntrace */
53    #include <mcheck.h>
54    /* ioctl */
55    #include <sys/ioctl.h>
56    /* KDMKTONE */
57    #include <linux/kd.h>
58    #endif /* __linux__ */
59    
60    
61    
62  /* First, define some types. */  /* First, define some types. */
63    
64    struct cons_struct;
65    struct symbol_struct;
66    struct environment_struct;
67    
68    /* A type for pointers to external functions */
69    typedef void (*funcp)(struct environment_struct*);
70    /* funcp is a pointer to a void function (environment *) */
71    
72    enum type_enum {
73      unknown,
74      empty,                        /* The empty list */
75      integer,
76      tfloat,
77      string,
78      func,                 /* Function pointer */
79      symb,                 /* Symbol */
80      tcons,                        /* A pair of two values */
81      port                  /* An I/O port */
82    };                      /* Type of stack element */
83    
84    
85  /* A value of some type */  /* A value of some type */
86  typedef struct {  typedef struct {
87    enum {    enum type_enum type:4;
     integer,  
     string,  
     func,                       /* Function pointer */  
     symb,  
     list  
   } type:3;                     /* Type of stack element */  
88    
89    int gc_garb:1;    union {
90        struct {
91          unsigned int mark:1;      /* Used internally in the GC */
92          unsigned int protect:1;   /* Protect from GC */
93        } flag;
94        unsigned int no_gc:2;       /* Both flags as one integer */
95      } gc;                         /* Garbage collector stuff */
96    
97    union {    union {
98      void *ptr;                  /* Pointer to the content */      void *ptr;                  /* Pointer to the content */
99      int val;                    /* ...or an integer */      struct cons_struct *c;      /* ...or a pointer to a cons cell */
100        struct symbol_struct *sym;  /* ...or a pointer to a symbol */
101        FILE *p;                    /* ...or an I/O stream */
102        int i;                      /* ...or an integer */
103        float f;                    /* ...or a floating point number */
104        funcp func;                 /* ...or a function pointer */
105        char *string;               /* ...or a string */
106    } content;                    /* Stores a pointer or an integer */    } content;                    /* Stores a pointer or an integer */
107    
108  } value;  } value;
109    
110    /* An item (value) on a stack */
111    typedef struct stackitem_struct
112    {
113      value *item;                 /* The value on the stack */
114                                   /* (This is never NULL) */
115      struct stackitem_struct *next; /* Next item */
116    } stackitem;
117    
118    typedef struct cons_struct {    /* A pair of two values */
119      value *car;
120      value *cdr;
121    } pair;
122    
123  /* A symbol with a name and possible value */  /* A symbol with a name and possible value */
124  /* (These do not need reference counters, they are kept unique by  /* (These do not need reference counters, they are kept unique by
125     hashing.) */     hashing.) */
# Line 34  typedef struct symbol_struct { Line 132  typedef struct symbol_struct {
132  /* A type for a hash table for symbols */  /* A type for a hash table for symbols */
133  typedef symbol *hashtbl[HASHTBLSIZE]; /* Hash table declaration */  typedef symbol *hashtbl[HASHTBLSIZE]; /* Hash table declaration */
134    
 /* 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;  
   
135  /* An environment; gives access to the stack and a hash table of  /* An environment; gives access to the stack and a hash table of
136     defined symbols */     defined symbols */
137  typedef struct {  typedef struct {
138    stackitem *gc_ref;    value *head;                  /* Head of the stack */
   int gc_limit, gc_count;  
   
   stackitem *head;              /* Head of the stack */  
139    hashtbl symbols;              /* Hash table of all variable bindings */    hashtbl symbols;              /* Hash table of all variable bindings */
140    int err;                      /* Error flag */    int err;                      /* Error flag */
141      char *errsymb;
142    char *in_string;              /* Input pending to be read */    char *in_string;              /* Input pending to be read */
143    char *free_string;            /* Free this string when all input is    char *free_string;            /* Free this string when all input is
144                                     read from in_string */                                     read from in_string */
145    FILE *inputstream;            /* stdin or a file, most likely */    FILE *inputstream;            /* stdin or a file, most likely */
146    int interactive;              /* print prompts, stack, etc */    int interactive;              /* print prompts, stack, etc */
147    
148      /* Garbage Collector stuff*/
149      stackitem *gc_ref;            /* Stack of all allocated values */
150      int gc_limit;                 /* Run GC when this much is allocated */
151      int gc_count;                 /* Amount currently allocated */
152  } environment;  } environment;
153    
 /* A type for pointers to external functions */  
 typedef void (*funcp)(environment*); /* funcp is a pointer to a void  
                                          function (environment *) */  
154    
155  void init_env(environment*);  void init_env(environment*);
156  void printerr(const char*);  void printerr(environment*);
157  extern void toss(environment*);  extern void toss(environment*);
158  symbol **hash(hashtbl, const char*);  symbol **hash(hashtbl, const char*);
159  value* new_val(environment*);  value* new_val(environment*);
160  void gc_mark(value*);  void gc_mark(value*);
161    void gc_maybe(environment*);
162  extern void gc_init(environment*);  extern void gc_init(environment*);
163    void protect(value*);
164    void unprotect(value*);
165  void push_val(environment*, value*);  void push_val(environment*, value*);
166  void push_int(environment*, int);  void push_int(environment*, int);
167    void push_float(environment*, float);
168  void push_cstring(environment*, const char*);  void push_cstring(environment*, const char*);
169  char *mangle_str(const char*);  char *mangle_str(const char*);
170  extern void mangle(environment*);  extern void mangle(environment*);
171  void push_sym(environment*, const char*);  void push_sym(environment*, const char*);
172  extern void nl();  extern void nl(environment*);
173    extern void nlport(environment*);
174  extern void type(environment*);  extern void type(environment*);
175  void print_h(stackitem*, int);  void print_val(environment *, value*, int, stackitem*, FILE*);
176  extern void print_(environment*);  extern void print_(environment*);
177  extern void print(environment*);  extern void print(environment*);
178  extern void princ_(environment*);  extern void princ_(environment*);
179  extern void princ(environment*);  extern void princ(environment*);
180  void print_st(stackitem*, long);  extern void printport_(environment*);
181    extern void printport(environment*);
182    extern void princport_(environment*);
183    extern void princport(environment*);
184    void print_st(environment*, value*, long);
185  extern void printstack(environment*);  extern void printstack(environment*);
186  extern void swap(environment*);  extern void swap(environment*);
187  extern void rot(environment*);  extern void rot(environment*);
# Line 104  extern void errn(environment*); Line 203  extern void errn(environment*);
203  extern void sx_2b(environment*);  extern void sx_2b(environment*);
204  extern void sx_2d(environment*);  extern void sx_2d(environment*);
205  extern void sx_3e(environment*);  extern void sx_3e(environment*);
206    extern void sx_3c(environment*);
207    extern void sx_3c3d(environment*);
208    extern void sx_3e3d(environment*);
209  value *copy_val(environment*, value*);  value *copy_val(environment*, value*);
210  extern void sx_647570(environment*);  extern void sx_647570(environment*);
211  extern void sx_6966(environment*);  extern void sx_6966(environment*);
212  extern void ifelse(environment*);  extern void ifelse(environment*);
213    extern void sx_656c7365(environment*);
214    extern void then(environment*);
215  extern void sx_7768696c65(environment*);  extern void sx_7768696c65(environment*);
216  extern void sx_666f72(environment*);  extern void sx_666f72(environment*);
217    extern void foreach(environment*);
218  extern void to(environment*);  extern void to(environment*);
219  extern void readline(environment*);  extern void readline(environment*);
220    extern void readlineport(environment*);
221    void readlinestream(environment*, FILE*);
222  extern void sx_72656164(environment*);  extern void sx_72656164(environment*);
223  extern void foreach(environment*);  extern void readport(environment*);
224    void readstream(environment*, FILE*);
225    extern void beep(environment*);
226    extern void sx_77616974(environment*);
227    extern void copying(environment*);
228    extern void warranty(environment*);
229    extern void sx_2a(environment*);
230    extern void sx_2f(environment*);
231    extern void mod(environment*);
232    extern void sx_646976(environment*);
233    extern void setcar(environment*);
234    extern void setcdr(environment*);
235    extern void car(environment*);
236    extern void cdr(environment*);
237    extern void cons(environment*);
238    extern void assq(environment*);
239    void assocgen(environment*, funcp);
240    extern void sx_646f(environment *);
241    extern void sx_6f70656e(environment*);
242    extern void sx_636c6f7365(environment*);
243    int check_args(environment*, int, ...);
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