cvs/stack/stack.h

/*
    stack - an interactive interpreter for a stack-based language
    Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Authors: Mats Alritzson <masse@fukt.bth.se>
             Teddy Hogeborn <teddy@fukt.bth.se>
*/

#define HASHTBLSIZE 2048

/* First, define some types. */

/* A value of some type */
typedef struct {
  enum {
    integer,
    tfloat,
    string,
    func,                       /* Function pointer */
    symb, 
    list
  } type:4;                     /* Type of stack element */

  union {
    struct {
      unsigned int mark:1;
      unsigned int protect:1;
    } flag;
    unsigned int no_gc:2;
  } gc;

  union {
    void *ptr;                  /* Pointer to the content */
    int i;                      /* ...or an integer */
    float f;
  } content;                    /* Stores a pointer or an integer */

} value;

/* A symbol with a name and possible value */
/* (These do not need reference counters, they are kept unique by
   hashing.) */
typedef struct symbol_struct {
  char *id;                     /* Symbol name */
  value *val;                   /* The value (if any) bound to it */
  struct symbol_struct *next;   /* In case of hashing conflicts, a */
} symbol;                       /* symbol is a kind of stack item. */

/* A type for a hash table for symbols */
typedef symbol *hashtbl[HASHTBLSIZE]; /* Hash table declaration */

/* 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;

/* An environment; gives access to the stack and a hash table of
   defined symbols */
typedef struct {
  stackitem *gc_ref;
  int gc_limit, gc_count;

  stackitem *head;              /* Head of the stack */
  hashtbl symbols;              /* Hash table of all variable bindings */
  int err;                      /* Error flag */
  char *in_string;              /* Input pending to be read */
  char *free_string;            /* Free this string when all input is
                                   read from in_string */
  FILE *inputstream;            /* stdin or a file, most likely */
  int interactive;              /* print prompts, stack, etc */
} environment;

/* A type for pointers to external functions */
typedef void (*funcp)(environment*); /* funcp is a pointer to a void
                                         function (environment *) */

void init_env(environment*);
void printerr(const char*);
extern void toss(environment*);
symbol **hash(hashtbl, const char*);
value* new_val(environment*);
void gc_mark(value*);
void gc_maybe(environment *env);
extern void gc_init(environment*);
void push_val(environment*, value*);
void push_int(environment*, int);
void push_float(environment*, float);
void push_cstring(environment*, const char*);
char *mangle_str(const char*);
extern void mangle(environment*);
void push_sym(environment*, const char*);
extern void nl();
extern void type(environment*);
void print_h(stackitem*, int);
extern void print_(environment*);
extern void print(environment*);
extern void princ_(environment*);
extern void princ(environment*);
void print_st(stackitem*, long);
extern void printstack(environment*);
extern void swap(environment*);
extern void rot(environment*);
extern void rcl(environment*);
extern void eval(environment*);
extern void rev(environment*);
extern void pack(environment*);
extern void expand(environment*);
extern void eq(environment*);
extern void not(environment*);
extern void neq(environment*);
extern void def(environment*);
extern void quit(environment*);
extern void clear(environment*);
extern void words(environment*);
void forget_sym(symbol**);
extern void forget(environment*);
extern void errn(environment*);
extern void sx_2b(environment*);
extern void sx_2d(environment*);
extern void sx_3e(environment*);
value *copy_val(environment*, value*);
extern void sx_647570(environment*);
extern void sx_6966(environment*);
extern void ifelse(environment*);
extern void sx_7768696c65(environment*);
extern void sx_666f72(environment*);
extern void to(environment*);
extern void readline(environment*);
extern void sx_72656164(environment*);
extern void foreach(environment*);
void protect(value*);
void unprotect(value*);
extern void copying(environment*);
extern void warranty(environment*);
extern void sx_2a(environment*);
extern void sx_2f(environment*);
extern void mod(environment*);
extern void sx_3c(environment*);
extern void sx_3c3d(environment*);
extern void sx_3e3d(environment*);
extern void sx_646976(environment*);
1	teddy	1.4	/*
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	teddy	1.1
23			#define HASHTBLSIZE 2048
24
25			/* First, define some types. */
26
27			/* A value of some type */
28			typedef struct {
29			enum {
30			integer,
31	masse	1.5	tfloat,
32	teddy	1.1	string,
33			func, /* Function pointer */
34			symb,
35			list
36	masse	1.5	} type:4; /* Type of stack element */
37	masse	1.2
38	teddy	1.9	union {
39			struct {
40			unsigned int mark:1;
41			unsigned int protect:1;
42			} flag;
43			unsigned int no_gc:2;
44			} gc;
45	teddy	1.1
46			union {
47			void ptr; / Pointer to the content */
48	masse	1.5	int i; /* ...or an integer */
49			float f;
50	teddy	1.1	} content; /* Stores a pointer or an integer */
51
52			} value;
53
54			/* A symbol with a name and possible value */
55			/* (These do not need reference counters, they are kept unique by
56			hashing.) */
57			typedef struct symbol_struct {
58			char id; / Symbol name */
59			value val; / The value (if any) bound to it */
60			struct symbol_struct next; / In case of hashing conflicts, a */
61			} symbol; /* symbol is a kind of stack item. */
62
63			/* A type for a hash table for symbols */
64			typedef symbol hashtbl[HASHTBLSIZE]; / Hash table declaration */
65
66			/* An item (value) on a stack */
67			typedef struct stackitem_struct
68			{
69			value item; / The value on the stack */
70			/* (This is never NULL) */
71			struct stackitem_struct next; / Next item */
72			} stackitem;
73
74			/* An environment; gives access to the stack and a hash table of
75			defined symbols */
76			typedef struct {
77			stackitem *gc_ref;
78			int gc_limit, gc_count;
79
80			stackitem head; / Head of the stack */
81			hashtbl symbols; /* Hash table of all variable bindings */
82			int err; /* Error flag */
83			char in_string; / Input pending to be read */
84			char free_string; / Free this string when all input is
85	teddy	1.4	read from in_string */
86	teddy	1.1	FILE inputstream; / stdin or a file, most likely */
87			int interactive; /* print prompts, stack, etc */
88			} environment;
89
90			/* A type for pointers to external functions */
91	masse	1.2	typedef void (funcp)(environment); /* funcp is a pointer to a void
92	teddy	1.1	function (environment ) /
93
94	masse	1.2	void init_env(environment*);
95			void printerr(const char*);
96			extern void toss(environment*);
97			symbol *hash(hashtbl, const char);
98			value* new_val(environment*);
99			void gc_mark(value*);
100	teddy	1.7	void gc_maybe(environment *env);
101	masse	1.2	extern void gc_init(environment*);
102			void push_val(environment, value);
103			void push_int(environment*, int);
104	masse	1.5	void push_float(environment*, float);
105	masse	1.2	void push_cstring(environment, const char);
106			char mangle_str(const char);
107			extern void mangle(environment*);
108			void push_sym(environment, const char);
109	teddy	1.1	extern void nl();
110	masse	1.2	extern void type(environment*);
111			void print_h(stackitem*, int);
112			extern void print_(environment*);
113			extern void print(environment*);
114			extern void princ_(environment*);
115			extern void princ(environment*);
116			void print_st(stackitem*, long);
117			extern void printstack(environment*);
118			extern void swap(environment*);
119			extern void rot(environment*);
120			extern void rcl(environment*);
121			extern void eval(environment*);
122			extern void rev(environment*);
123			extern void pack(environment*);
124			extern void expand(environment*);
125			extern void eq(environment*);
126			extern void not(environment*);
127			extern void neq(environment*);
128			extern void def(environment*);
129			extern void quit(environment*);
130			extern void clear(environment*);
131			extern void words(environment*);
132			void forget_sym(symbol**);
133			extern void forget(environment*);
134			extern void errn(environment*);
135			extern void sx_2b(environment*);
136			extern void sx_2d(environment*);
137			extern void sx_3e(environment*);
138			value copy_val(environment, value*);
139			extern void sx_647570(environment*);
140			extern void sx_6966(environment*);
141			extern void ifelse(environment*);
142			extern void sx_7768696c65(environment*);
143			extern void sx_666f72(environment*);
144			extern void to(environment*);
145			extern void readline(environment*);
146			extern void sx_72656164(environment*);
147			extern void foreach(environment*);
148	masse	1.8	void protect(value*);
149			void unprotect(value*);
150	masse	1.5	extern void copying(environment*);
151			extern void warranty(environment*);
152			extern void sx_2a(environment*);
153			extern void sx_2f(environment*);
154			extern void mod(environment*);
155			extern void sx_3c(environment*);
156			extern void sx_3c3d(environment*);
157			extern void sx_3e3d(environment*);
158	masse	1.6	extern void sx_646976(environment*);