microscheme/scheme-private.h

/*
 * µscheme
 *
 * Copyright (C) 2015 Marc Alexander Lehmann <uscheme@schmorp.de>
 *                 do as you want with this, attribution appreciated.
 */

/* scheme-private.h */

#ifndef SCHEME_PRIVATE_H
#define SCHEME_PRIVATE_H

#include "scheme.h"

/*------------------ Ugly internals -----------------------------------*/

/*------------------ Of interest only to FFI users --------------------*/

# ifdef __cplusplus
extern "C"
{
# endif

enum scheme_port_kind
{
  port_free = 0,
  port_file = 1,
  port_string = 2,
  port_srfi6 = 4,
  port_input = 16,
  port_output = 32,
  port_saw_EOF = 64
};

typedef struct port
{
  unsigned char kind;
  int16_t unget;
  union
  {
    struct
    {
      int file;
      int closeit;
# if SHOW_ERROR_LINE
      int curr_line;
      char *filename;
# endif
    } stdio;
    struct
    {
      char *start;
      char *past_the_end;
      char *curr;
    } string;
  } rep;
} port;

/* cell structure */
struct cell
{
  union
  {
    struct
    {
      char *svalue;
      uint32_t length;
    } string;

    struct {
      struct cell **vvalue;
      uint32_t length;
    } vector;

    intptr_t ivalue;
#if USE_REAL
    double rvalue;
#endif

    port *port;

    foreign_func ff;

    struct
    {
      struct cell *car;
      struct cell *cdr;
    } cons;

  } object;

  uint8_t flag;
};

/* frequently accessed members are near the beginning, reducing codesize esp. on CISC */
struct scheme
{
  /* NIL is the most commonly accessed value */
  struct cell xNIL;           /* special cell representing empty cell */

  /* We use 4 registers. */
  pointer args;               /* register for arguments of function */
  pointer envir;              /* stack register for current environment */
  pointer code;               /* register for current code */
  pointer dump;               /* stack register for next evaluation */

  struct cell xT;             /* special cell representing #t */
  struct cell xF;             /* special cell representing #f */
  struct cell xEOF_OBJ;       /* special cell representing end-of-file object */
  struct cell xsink;          /* when mem. alloc. fails */

  /* arrays for segments */
#ifndef CELL_SEGSIZE
# define CELL_SEGSIZE    128   /* # of cells in one segment */
#endif
#ifndef CELL_NSEGMENT
# define CELL_NSEGMENT   10     /* # of segments for cells */
#endif
  char *alloc_seg[CELL_NSEGMENT];
  pointer cell_seg[CELL_NSEGMENT];
  int cell_segsize[CELL_NSEGMENT];
  int last_cell_seg;

  int interactive_repl;       /* are we in an interactive REPL? */

  pointer oblist;             /* pointer to symbol table */
  pointer global_env;         /* pointer to global environment */
  pointer c_nest;             /* stack for nested calls from C */

  /* global pointers to special symbols */
  pointer LAMBDA;             /* pointer to syntax lambda */
  pointer QUOTE;              /* pointer to syntax quote */

  pointer QQUOTE;             /* pointer to symbol quasiquote */
  pointer UNQUOTE;            /* pointer to symbol unquote */
  pointer UNQUOTESP;          /* pointer to symbol unquote-splicing */
  pointer FEED_TO;            /* => */
  pointer COLON_HOOK;         /* *colon-hook* */
  pointer ERROR_HOOK;         /* *error-hook* */
  pointer SHARP_HOOK;         /* *sharp-hook* */
  pointer COMPILE_HOOK;       /* *compile-hook* */

  pointer free_cell;          /* pointer to top of free cells */
  long fcells;                /* # of free cells */

  /* return code */
  int retcode;
  int tracing;

  pointer inport;
  pointer outport;
  pointer save_inport;
  pointer loadport;

#define MAXFIL 8
  port load_stack[MAXFIL];    /* Stack of open files for port -1 (LOADing) */
  int nesting_stack[MAXFIL];
  int file_i;
  int nesting;

  char gc_verbose;            /* if gc_verbose is not zero, print gc status */
  char no_memory;             /* Whether mem. alloc. has failed */

#define LINESIZE 1024
  char linebuff[LINESIZE];
#define STRBUFFSIZE 256
  char strbuff[STRBUFFSIZE];

  int tmpfp;
  int tok;
  int print_flag;
  pointer value;
  int op;

  void *ext_data;             /* For the benefit of foreign functions */
  long gensym_cnt;

  struct scheme_interface *vptr;
  struct dump_stack_frame *dump_base; /* pointer to base of allocated dump stack */
  int dump_size;                      /* number of frames allocated for dump stack */
};

/* operator code */
enum scheme_opcodes
{
#define OP_DEF(func,name,minarity,maxarity,argtest,op) op,
#include "opdefines.h"
#undef OP_DEF
  OP_MAXDEFINED
};

typedef struct num num;

#define cons(a,b) xcons(SCHEME_A_ a,b,0)
#define immutable_cons(a,b) xcons(SCHEME_A_ a,b,1)

INTERFACE int is_string (pointer p);
INTERFACE char *string_value (pointer p);
INTERFACE int is_number (pointer p);
INTERFACE num nvalue (pointer p);
INTERFACE int is_integer (pointer p);
INTERFACE int is_real (pointer p);
INTERFACE int is_character (pointer p);
INTERFACE long charvalue (pointer p);
INTERFACE int is_vector (pointer p);

INTERFACE int is_port (pointer p);

INTERFACE int is_pair (pointer p);
INTERFACE pointer pair_car (pointer p);
INTERFACE pointer pair_cdr (pointer p);
INTERFACE void set_car (pointer p, pointer q);
INTERFACE void set_cdr (pointer p, pointer q);

INTERFACE int is_symbol (pointer p);
INTERFACE char *symname (pointer p);
INTERFACE int hasprop (pointer p);

INTERFACE int is_syntax (pointer p);
INTERFACE int is_proc (pointer p);
INTERFACE int is_foreign (pointer p);
INTERFACE char *syntaxname (pointer p);
INTERFACE int is_closure (pointer p);
#ifdef USE_MACRO
INTERFACE int is_macro (pointer p);
#endif
INTERFACE pointer closure_code (pointer p);
INTERFACE pointer closure_env (pointer p);

INTERFACE int is_continuation (pointer p);
INTERFACE int is_promise (pointer p);
INTERFACE int is_environment (pointer p);
INTERFACE int is_immutable (pointer p);
INTERFACE void setimmutable (pointer p);

#ifdef __cplusplus
}
#endif

#endif

/*
Local variables:
c-file-style: "k&r"
End:
*/
Revision:	1.6
Committed:	Sat Nov 28 05:12:53 2015 UTC (8 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.5:	+7 -4 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.4	/*
2			* µscheme
3			*
4			* Copyright (C) 2015 Marc Alexander Lehmann <uscheme@schmorp.de>
5			* do as you want with this, attribution appreciated.
6			*/
7	root	1.1
8			/* scheme-private.h */
9
10			#ifndef SCHEME_PRIVATE_H
11	root	1.2	#define SCHEME_PRIVATE_H
12	root	1.1
13	root	1.2	#include "scheme.h"
14
15	root	1.1	/------------------ Ugly internals -----------------------------------/
16
17			/------------------ Of interest only to FFI users --------------------/
18
19			# ifdef __cplusplus
20			extern "C"
21			{
22			# endif
23
24			enum scheme_port_kind
25			{
26			port_free = 0,
27			port_file = 1,
28			port_string = 2,
29			port_srfi6 = 4,
30			port_input = 16,
31			port_output = 32,
32			port_saw_EOF = 64
33			};
34
35			typedef struct port
36			{
37			unsigned char kind;
38			int16_t unget;
39			union
40			{
41			struct
42			{
43			int file;
44			int closeit;
45			# if SHOW_ERROR_LINE
46			int curr_line;
47			char *filename;
48			# endif
49			} stdio;
50			struct
51			{
52			char *start;
53			char *past_the_end;
54			char *curr;
55			} string;
56			} rep;
57			} port;
58
59			/* cell structure */
60			struct cell
61			{
62			union
63			{
64			struct
65			{
66			char *svalue;
67	root	1.3	uint32_t length;
68	root	1.1	} string;
69
70	root	1.3	struct {
71			struct cell **vvalue;
72			uint32_t length;
73			} vector;
74
75	root	1.6	intptr_t ivalue;
76			#if USE_REAL
77			double rvalue;
78			#endif
79	root	1.1
80			port *port;
81
82			foreign_func ff;
83
84			struct
85			{
86			struct cell *car;
87			struct cell *cdr;
88			} cons;
89
90			} object;
91
92	root	1.3	uint8_t flag;
93	root	1.1	};
94
95			/* frequently accessed members are near the beginning, reducing codesize esp. on CISC */
96			struct scheme
97			{
98			/* NIL is the most commonly accessed value */
99			struct cell xNIL; /* special cell representing empty cell */
100
101			/* We use 4 registers. */
102			pointer args; /* register for arguments of function */
103			pointer envir; /* stack register for current environment */
104			pointer code; /* register for current code */
105			pointer dump; /* stack register for next evaluation */
106
107			struct cell xT; /* special cell representing #t */
108			struct cell xF; /* special cell representing #f */
109			struct cell xEOF_OBJ; /* special cell representing end-of-file object */
110			struct cell xsink; /* when mem. alloc. fails */
111
112			/* arrays for segments */
113			#ifndef CELL_SEGSIZE
114			# define CELL_SEGSIZE 128 /* # of cells in one segment */
115			#endif
116			#ifndef CELL_NSEGMENT
117			# define CELL_NSEGMENT 10 /* # of segments for cells */
118			#endif
119			char *alloc_seg[CELL_NSEGMENT];
120			pointer cell_seg[CELL_NSEGMENT];
121			int cell_segsize[CELL_NSEGMENT];
122			int last_cell_seg;
123
124			int interactive_repl; /* are we in an interactive REPL? */
125
126			pointer oblist; /* pointer to symbol table */
127			pointer global_env; /* pointer to global environment */
128			pointer c_nest; /* stack for nested calls from C */
129
130			/* global pointers to special symbols */
131			pointer LAMBDA; /* pointer to syntax lambda */
132			pointer QUOTE; /* pointer to syntax quote */
133
134			pointer QQUOTE; /* pointer to symbol quasiquote */
135			pointer UNQUOTE; /* pointer to symbol unquote */
136			pointer UNQUOTESP; /* pointer to symbol unquote-splicing */
137			pointer FEED_TO; /* => */
138			pointer COLON_HOOK; /* colon-hook */
139			pointer ERROR_HOOK; /* error-hook */
140			pointer SHARP_HOOK; /* sharp-hook */
141			pointer COMPILE_HOOK; /* compile-hook */
142
143			pointer free_cell; /* pointer to top of free cells */
144			long fcells; /* # of free cells */
145
146			/* return code */
147			int retcode;
148			int tracing;
149
150			pointer inport;
151			pointer outport;
152			pointer save_inport;
153			pointer loadport;
154
155	root	1.6	#define MAXFIL 8
156	root	1.1	port load_stack[MAXFIL]; /* Stack of open files for port -1 (LOADing) */
157			int nesting_stack[MAXFIL];
158			int file_i;
159			int nesting;
160
161			char gc_verbose; /* if gc_verbose is not zero, print gc status */
162			char no_memory; /* Whether mem. alloc. has failed */
163
164	root	1.5	#define LINESIZE 1024
165	root	1.1	char linebuff[LINESIZE];
166	root	1.5	#define STRBUFFSIZE 256
167	root	1.1	char strbuff[STRBUFFSIZE];
168
169			int tmpfp;
170			int tok;
171			int print_flag;
172			pointer value;
173			int op;
174
175			void ext_data; / For the benefit of foreign functions */
176			long gensym_cnt;
177
178			struct scheme_interface *vptr;
179			struct dump_stack_frame dump_base; / pointer to base of allocated dump stack */
180			int dump_size; /* number of frames allocated for dump stack */
181			};
182
183			/* operator code */
184			enum scheme_opcodes
185			{
186	root	1.5	#define OP_DEF(func,name,minarity,maxarity,argtest,op) op,
187			#include "opdefines.h"
188			#undef OP_DEF
189	root	1.1	OP_MAXDEFINED
190			};
191
192	root	1.6	typedef struct num num;
193
194	root	1.5	#define cons(a,b) xcons(SCHEME_A_ a,b,0)
195			#define immutable_cons(a,b) xcons(SCHEME_A_ a,b,1)
196	root	1.1
197			INTERFACE int is_string (pointer p);
198			INTERFACE char *string_value (pointer p);
199			INTERFACE int is_number (pointer p);
200			INTERFACE num nvalue (pointer p);
201			INTERFACE int is_integer (pointer p);
202			INTERFACE int is_real (pointer p);
203			INTERFACE int is_character (pointer p);
204			INTERFACE long charvalue (pointer p);
205			INTERFACE int is_vector (pointer p);
206
207			INTERFACE int is_port (pointer p);
208
209			INTERFACE int is_pair (pointer p);
210			INTERFACE pointer pair_car (pointer p);
211			INTERFACE pointer pair_cdr (pointer p);
212			INTERFACE void set_car (pointer p, pointer q);
213			INTERFACE void set_cdr (pointer p, pointer q);
214
215			INTERFACE int is_symbol (pointer p);
216			INTERFACE char *symname (pointer p);
217			INTERFACE int hasprop (pointer p);
218
219			INTERFACE int is_syntax (pointer p);
220			INTERFACE int is_proc (pointer p);
221			INTERFACE int is_foreign (pointer p);
222			INTERFACE char *syntaxname (pointer p);
223			INTERFACE int is_closure (pointer p);
224	root	1.5	#ifdef USE_MACRO
225	root	1.1	INTERFACE int is_macro (pointer p);
226	root	1.5	#endif
227	root	1.1	INTERFACE pointer closure_code (pointer p);
228			INTERFACE pointer closure_env (pointer p);
229
230			INTERFACE int is_continuation (pointer p);
231			INTERFACE int is_promise (pointer p);
232			INTERFACE int is_environment (pointer p);
233			INTERFACE int is_immutable (pointer p);
234			INTERFACE void setimmutable (pointer p);
235
236	root	1.2	#ifdef __cplusplus
237	root	1.1	}
238	root	1.2	#endif
239	root	1.1
240			#endif
241
242			/*
243			Local variables:
244			c-file-style: "k&r"
245			End:
246			*/