source: abuse/trunk/src/lisp/lisp.h @ 496

Last change on this file since 496 was 496, checked in by Sam Hocevar, 10 years ago

lisp: implement LObject::Eval.

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File size: 6.8 KB
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1/*
2 *  Abuse - dark 2D side-scrolling platform game
3 *  Copyright (c) 1995 Crack dot Com
4 *  Copyright (c) 2005-2011 Sam Hocevar <sam@hocevar.net>
5 *
6 *  This software was released into the Public Domain. As with most public
7 *  domain software, no warranty is made or implied by Crack dot Com or
8 *  Jonathan Clark.
9 */
10
11#ifndef __LISP_HPP_
12#define __LISP_HPP_
13
14#include <cstdlib>
15#include <stdint.h>
16
17#ifdef L_PROFILE
18#include "timing.h"
19#endif
20
21#define Cell void
22#define MAX_LISP_TOKEN_LEN 200
23enum { PERM_SPACE,
24       TMP_SPACE,
25       USER_SPACE,
26       GC_SPACE };
27
28#define FIXED_TRIG_SIZE 360               // 360 degrees stored in table
29extern int32_t sin_table[FIXED_TRIG_SIZE];   // this should be filled in by external module
30#define TBS 1662                          // atan table granularity
31extern uint16_t atan_table[TBS];
32#define NILP(x) (x==NULL)
33#define DEFINEDP(x) (x!=l_undefined)
34class bFILE;
35extern int current_space;
36extern bFILE *current_print_file;
37
38
39enum { L_BAD_CELL,   // error catching type
40       L_CONS_CELL, L_NUMBER, L_SYMBOL,     L_SYS_FUNCTION, L_USER_FUNCTION,
41       L_STRING, L_CHARACTER, L_C_FUNCTION, L_C_BOOL,       L_L_FUNCTION, L_POINTER,
42       L_OBJECT_VAR, L_1D_ARRAY,
43       L_FIXED_POINT, L_COLLECTED_OBJECT };
44
45typedef uint32_t ltype;    // make sure structures aren't packed differently on various compiler
46                       // and sure that word, etc are word aligned
47
48struct LObject
49{
50    /* Factories */
51    static LObject *Compile(char const *&s);
52
53    /* Methods */
54    LObject *Eval();
55    void Print();
56
57    /* Members */
58    ltype type;
59};
60
61struct LObjectVar : LObject
62{
63    /* Factories */
64    static LObjectVar *Create(int index);
65
66    /* Members */
67    int index;
68};
69
70struct LList : LObject
71{
72    /* Factories */
73    static LList *Create();
74
75    /* Methods */
76    size_t GetLength();
77
78    /* Members */
79    LObject *cdr, *car;
80};
81
82struct LNumber : LObject
83{
84    /* Factories */
85    static LNumber *Create(long num);
86
87    /* Members */
88    long num;
89};
90
91struct LRedirect : LObject
92{
93    /* Members */
94    LObject *ref;
95};
96
97struct LString : LObject
98{
99    /* Factories */
100    static LString *Create(char const *string);
101    static LString *Create(char const *string, int length);
102    static LString *Create(int length);
103
104    /* Methods */
105    char *GetString();
106
107    /* Members */
108private:
109    char str[1]; /* Can be allocated much larger than 1 */
110};
111
112struct LSymbol : LObject
113{
114    /* Factories */
115    static LSymbol *Find(char const *name);
116    static LSymbol *FindOrCreate(char const *name);
117
118    /* Methods */
119    LString *GetName();
120    LObject *GetFunction();
121    LObject *GetValue();
122
123    void SetFunction(LObject *fun);
124    void SetValue(LObject *value);
125    void SetNumber(long num);
126
127    /* Members */
128#ifdef L_PROFILE
129    float time_taken;
130#endif
131    LObject *value;
132    LObject *function;
133    LString *name;
134    LSymbol *left, *right; // tree structure
135
136    /* Static members */
137    static LSymbol *root;
138    static size_t count;
139};
140
141struct LSysFunction : LObject
142{
143    short min_args, max_args;
144    short fun_number;
145};
146
147struct LUserFunction : LObject
148{
149#ifndef NO_LIBS
150    intptr_t alist, blist;      // id for cached blocks
151#else
152    void *arg_list, *block_list;
153#endif
154};
155
156struct LArray : LObject
157{
158    /* Factories */
159    static LArray *Create(size_t len, void *rest);
160
161    /* Methods */
162    inline LObject **GetData() { return data; }
163    LObject *Get(int x);
164
165    /* Members */
166    size_t len;
167
168private:
169    LObject *data[1]; /* Can be allocated much larger than 1 */
170};
171
172struct LChar : LObject
173{
174    /* Factories */
175    static LChar *Create(uint16_t ch);
176
177    /* Members */
178    uint16_t ch;
179};
180
181struct LPointer : LObject
182{
183    /* Factories */
184    static LPointer *Create(void *addr);
185
186    /* Members */
187    void *addr;
188};
189
190struct LFixedPoint : LObject
191{
192    /* Factories */
193    static LFixedPoint *Create(int32_t x);
194
195    /* Members */
196    int32_t x;
197};
198
199static inline LObject *&CAR(void *x) { return ((LList *)x)->car; }
200static inline LObject *&CDR(void *x) { return ((LList *)x)->cdr; }
201static inline ltype item_type(void *x) { if (x) return *(ltype *)x; return L_CONS_CELL; }
202
203void perm_space();
204void tmp_space();
205void use_user_space(void *addr, long size);
206void *lpointer_value(void *lpointer);
207int32_t lnumber_value(void *lnumber);
208unsigned short lcharacter_value(void *c);
209long lfixed_point_value(void *c);
210void *lisp_atom(void *i);
211LObject *lcdr(void *c);
212LObject *lcar(void *c);
213void *lisp_eq(void *n1, void *n2);
214void *lisp_equal(void *n1, void *n2);
215void *eval_block(void *list);
216void *eval_function(LSymbol *sym, void *arg_list);
217void *eval_user_fun(LSymbol *sym, void *arg_list);
218void *assoc(void *item, void *list);
219void resize_tmp(int new_size);
220void resize_perm(int new_size);
221
222void push_onto_list(void *object, void *&list);
223LSymbol *add_c_object(void *symbol, int index);
224LSymbol *add_c_function(char const *name, short min_args, short max_args, short number);
225LSymbol *add_c_bool_fun(char const *name, short min_args, short max_args, short number);
226LSymbol *add_lisp_function(char const *name, short min_args, short max_args, short number);
227int read_ltoken(char *&s, char *buffer);
228void print_trace_stack(int max_levels);
229
230
231LSysFunction *new_lisp_sys_function(int min_args, int max_args, int fun_number);
232LSysFunction *new_lisp_c_function(int min_args, int max_args, int fun_number);
233LSysFunction *new_lisp_c_bool(int min_args, int max_args, int fun_number);
234
235#ifdef NO_LIBS
236LUserFunction *new_lisp_user_function(void *arg_list, void *block_list);
237#else
238LUserFunction *new_lisp_user_function(intptr_t arg_list, intptr_t block_list);
239#endif
240
241LSysFunction *new_user_lisp_function(int min_args, int max_args, int fun_number);
242
243int end_of_program(char *s);
244void clear_tmp();
245void lisp_init(long perm_size, long tmp_size);
246void lisp_uninit();
247
248extern uint8_t *space[4], *free_space[4];
249extern int space_size[4];
250void *nth(int num, void *list);
251int32_t lisp_atan2(int32_t dy, int32_t dx);
252int32_t lisp_sin(int32_t x);
253int32_t lisp_cos(int32_t x);
254void restore_heap(void *val, int heap);
255void *mark_heap(int heap);
256
257extern "C" {
258void lbreak(const char *format, ...);
259} ;
260
261extern void clisp_init();                      // external initalizer call by lisp_init()
262extern long c_caller(long number, void *arg);  // exten c function switches on number
263extern void *l_caller(long number, void *arg);  // exten lisp function switches on number
264
265extern void *l_obj_get(long number);  // exten lisp function switches on number
266extern void l_obj_set(long number, void *arg);  // exten lisp function switches on number
267extern void l_obj_print(long number);  // exten lisp function switches on number
268
269// FIXME: get rid of this later
270static inline void *symbol_value(void *sym) { return ((LSymbol *)sym)->GetValue(); }
271static inline char *lstring_value(void *str) { return ((LString *)str)->GetString(); }
272
273#include "lisp_opt.h"
274
275#endif
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