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/* |
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stack - an interactive interpreter for a stack-based language |
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Copyright (C) 2002 Mats Alritzson and Teddy Hogeborn |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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|
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Authors: Mats Alritzson <masse@fukt.bth.se> |
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Teddy Hogeborn <teddy@fukt.bth.se> |
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*/ |
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|
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#define HASHTBLSIZE 2048 |
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|
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/* First, define some types. */ |
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|
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struct cons_struct; |
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struct symbol_struct; |
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|
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/* A value of some type */ |
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typedef struct { |
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enum { |
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empty, /* The empty list */ |
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integer, |
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tfloat, |
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string, |
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func, /* Function pointer */ |
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symb, /* Symbol */ |
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tcons /* A pair of two values */ |
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} type:4; /* Type of stack element */ |
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|
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union { |
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struct { |
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unsigned int mark:1; /* Used internally in the GC */ |
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unsigned int protect:1; /* Protect from GC */ |
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} flag; |
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unsigned int no_gc:2; /* Both flags as one integer */ |
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} gc; /* Garbage collector stuff */ |
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|
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union { |
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void *ptr; /* Pointer to the content */ |
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struct cons_struct *c; /* ...or a pointer to a cons cell */ |
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struct symbol_struct *sym; /* ...or a pointer to a symbol */ |
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int i; /* ...or an integer */ |
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float f; /* ...or a floating point number */ |
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} content; /* Stores a pointer or an integer */ |
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|
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} value; |
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|
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/* An item (value) on a stack */ |
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typedef struct stackitem_struct |
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{ |
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value *item; /* The value on the stack */ |
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/* (This is never NULL) */ |
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struct stackitem_struct *next; /* Next item */ |
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} stackitem; |
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|
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typedef struct cons_struct { /* A pair of two values */ |
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value *car; |
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value *cdr; |
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} cons; |
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|
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/* A symbol with a name and possible value */ |
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/* (These do not need reference counters, they are kept unique by |
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hashing.) */ |
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typedef struct symbol_struct { |
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char *id; /* Symbol name */ |
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value *val; /* The value (if any) bound to it */ |
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struct symbol_struct *next; /* In case of hashing conflicts, a */ |
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} symbol; /* symbol is a kind of stack item. */ |
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|
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/* A type for a hash table for symbols */ |
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typedef symbol *hashtbl[HASHTBLSIZE]; /* Hash table declaration */ |
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|
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/* An environment; gives access to the stack and a hash table of |
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defined symbols */ |
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typedef struct { |
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value *head; /* Head of the stack */ |
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hashtbl symbols; /* Hash table of all variable bindings */ |
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int err; /* Error flag */ |
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char *in_string; /* Input pending to be read */ |
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char *free_string; /* Free this string when all input is |
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read from in_string */ |
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FILE *inputstream; /* stdin or a file, most likely */ |
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int interactive; /* print prompts, stack, etc */ |
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|
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/* Garbage Collector stuff*/ |
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stackitem *gc_ref; /* Stack of all allocated values */ |
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int gc_limit; /* Run GC when this much is allocated */ |
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int gc_count; /* Amount currently allocated */ |
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} environment; |
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|
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/* A type for pointers to external functions */ |
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typedef void (*funcp)(environment*); /* funcp is a pointer to a void |
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function (environment *) */ |
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|
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void init_env(environment*); |
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void printerr(const char*); |
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extern void toss(environment*); |
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symbol **hash(hashtbl, const char*); |
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value* new_val(environment*); |
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void gc_mark(value*); |
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void gc_maybe(environment *env); |
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extern void gc_init(environment*); |
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void push_val(environment*, value*); |
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void push_int(environment*, int); |
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void push_float(environment*, float); |
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void push_cstring(environment*, const char*); |
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char *mangle_str(const char*); |
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extern void mangle(environment*); |
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void push_sym(environment*, const char*); |
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extern void nl(); |
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extern void type(environment*); |
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void print_h(value*, int); |
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extern void print_(environment*); |
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extern void print(environment*); |
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extern void princ_(environment*); |
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extern void princ(environment*); |
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void print_st(value*, long); |
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extern void printstack(environment*); |
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extern void swap(environment*); |
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extern void rot(environment*); |
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extern void rcl(environment*); |
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extern void eval(environment*); |
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extern void rev(environment*); |
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extern void pack(environment*); |
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extern void expand(environment*); |
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extern void eq(environment*); |
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extern void not(environment*); |
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extern void neq(environment*); |
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extern void def(environment*); |
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extern void quit(environment*); |
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extern void clear(environment*); |
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extern void words(environment*); |
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void forget_sym(symbol**); |
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extern void forget(environment*); |
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extern void errn(environment*); |
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extern void sx_2b(environment*); |
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extern void sx_2d(environment*); |
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extern void sx_3e(environment*); |
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value *copy_val(environment*, value*); |
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extern void sx_647570(environment*); |
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extern void sx_6966(environment*); |
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extern void ifelse(environment*); |
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extern void sx_7768696c65(environment*); |
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extern void sx_666f72(environment*); |
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extern void to(environment*); |
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extern void readline(environment*); |
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extern void sx_72656164(environment*); |
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extern void foreach(environment*); |
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void protect(value*); |
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void unprotect(value*); |
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extern void copying(environment*); |
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extern void warranty(environment*); |
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extern void sx_2a(environment*); |
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extern void sx_2f(environment*); |
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extern void mod(environment*); |
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extern void sx_3c(environment*); |
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extern void sx_3c3d(environment*); |
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extern void sx_3e3d(environment*); |
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extern void sx_646976(environment*); |
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extern void then(environment*); |
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