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/*\ 
||| This file a part of uLPC, and is copyright by Fredrik Hubinette 
||| uLPC is distributed as GPL (General Public License) 
||| See the files COPYING and DISCLAIMER for more information. 
\*/ 
#ifndef EXEC_H 
#define EXEC_H 
 
#include <stdarg.h> 
#include "config.h" 
#include "machine.h" 
#include "types.h" 
 
struct svalue; 
struct module; 
struct object; 
 
/* I need: 
 * a) one type that can point to a callable function. 
 *    (C function, or object->fun) 
 * This can for instance be an svalue. 
 * 
 * b) one type that once the object/program is known can point 
 *    to the C/LPC function body. 
 * 
 * c) A number of flags to send to 'add_simul_efun' to specify side effects 
 *    and such. 
 */ 
 
 
/* 
 * Max program dimensions: 
 * 2^16 functions 
 * 2^16 inherits 
 * 2^16 arguments to lpc functions 
 * 2^32 to efuns and C functions 
 * 2^8 local variables (and arguments) 
 * 2^16 global variables 
 */ 
 
union idptr 
{ 
  void (*c_fun)(INT32); 
  INT32 offset; 
}; 
 
#define IDENTIFIER_LPC_FUNCTION 1 
#define IDENTIFIER_C_FUNCTION 2 
#define IDENTIFIER_FUNCTION 3 
#define IDENTIFIER_VARARGS 4 
 
struct identifier 
{ 
  struct lpc_string *name; 
  struct lpc_string *type; 
  unsigned INT16 flags; /* IDENTIFIER_??? */ 
  unsigned INT16 run_time_type; 
  union idptr func; 
}; 
 
/* 
 * in the bytecode, a function starts with: 
 * char num_args 
 * char num_locals 
 * char code[] 
 */ 
 
#define ID_STATIC    0x01 
#define ID_PRIVATE   0x02 
#define ID_NOMASK    0x04 
#define ID_PUBLIC    0x08 
#define ID_PROTECTED 0x10 
#define ID_VARARGS   0x20 
#define ID_INLINE    0x40 
#define ID_HIDDEN    0x80 /* needed? */ 
#define ID_INHERITED 0x100 
 
struct reference 
{ 
  unsigned INT16 inherit_offset; 
  unsigned INT16 identifier_offset; 
  INT16 flags; /* static, private etc.. */ 
}; 
 
struct inherit 
{ 
  struct program *prog; 
  INT16 inherit_level; /* really needed? */ 
  INT16 identifier_level; 
  INT32 storage_offset; 
}; 
 
struct program 
{ 
  INT32 refs; 
  INT32 id;             /* used to identify program in caches */ 
  INT32 storage_needed; /* storage needed in the object struct */ 
 
  struct program *next; 
  struct program *prev; 
  unsigned char *program; 
  struct lpc_string **strings; 
  struct inherit *inherits; 
  struct reference *identifier_references; 
  struct identifier *identifiers; 
  unsigned INT16 *identifier_index; 
  struct svalue *constants; 
  char *linenumbers; 
  struct module *from_module; 
  void (*init)(char *,struct object *); 
  void (*exit)(char *,struct object *); 
#ifdef DEBUG 
  unsigned INT32 checksum; 
#endif 
 
  SIZE_T total_size; 
  SIZE_T num_linenumbers; 
  SIZE_T program_size; 
  unsigned INT16 num_constants; 
  unsigned INT16 num_strings; 
  unsigned INT16 num_identifiers; 
  unsigned INT16 num_identifier_references; 
  unsigned INT16 num_identifier_indexes; 
  unsigned INT16 num_inherits; 
}; 
 
#define INHERIT_FROM_PTR(P,X) ((P)->inherits + (X)->inherit_offset) 
#define PROG_FROM_PTR(P,X) (INHERIT_FROM_PTR(P,X)->prog) 
#define ID_FROM_PTR(P,X) (PROG_FROM_PTR(P,X)->identifiers+(X)->identifier_offset) 
#define INHERIT_FROM_INT(P,X) INHERIT_FROM_PTR(P,(P)->identifier_references+(X)) 
#define PROG_FROM_INT(P,X) PROG_FROM_PTR(P,(P)->identifier_references+(X)) 
#define ID_FROM_INT(P,X) ID_FROM_PTR(P,(P)->identifier_references+(X)) 
 
#define free_program(p) do{ struct program *_=(p); if(!--_->refs) really_free_program(_); }while(0) 
 
extern struct object fake_object; 
extern struct program fake_program; 
 
/* Prototypes begin here */ 
struct id_hash_entry; 
void setup_fake_program(); 
void start_new_program(); 
void really_free_program(struct program *p); 
void dump_program_desc(struct program *p); 
void toss_current_program(); 
void check_program(struct program *p); 
struct program *end_program(); 
SIZE_T add_storage(SIZE_T size); 
void set_init_callback(void (*init)(char *,struct object *)); 
void set_exit_callback(void (*exit)(char *,struct object *)); 
int low_reference_inherited_identifier(int e,struct lpc_string *name); 
int reference_inherited_identifier(struct lpc_string *super_name, 
                                   struct lpc_string *function_name); 
void rename_last_inherit(struct lpc_string *n); 
void do_inherit(struct program *p,INT32 flags, struct lpc_string *name); 
void simple_do_inherit(struct lpc_string *s, INT32 flags,struct lpc_string *name); 
int isidentifier(struct lpc_string *s); 
int define_variable(struct lpc_string *name, 
                    struct lpc_string *type, 
                    INT32 flags); 
INT32 define_function(struct lpc_string *name, 
                      struct lpc_string *type, 
                      INT16 flags, 
                      INT8 function_flags, 
                      union idptr *func); 
struct ff_hash; 
int find_shared_string_identifier(struct lpc_string *name, 
                                  struct program *prog); 
int find_identifier(char *name,struct program *prog); 
int store_prog_string(struct lpc_string *str); 
int store_constant(struct svalue *foo, int equal); 
void start_line_numbering(void); 
void store_linenumber(void); 
char *get_line(unsigned char *pc,struct program *prog,INT32 *linep); 
void my_yyerror(char *fmt,...); 
void compile(); 
struct program *compile_file(struct lpc_string *file_name); 
struct program *compile_string(struct lpc_string *prog, 
                               struct lpc_string *name); 
struct program *end_c_program(char *name); 
void add_function(char *name,void (*cfun)(INT32),char *type,INT16 flags); 
void check_all_programs(); 
void cleanup_program(); 
void gc_mark_program_as_referenced(struct program *p); 
void gc_check_all_programs(); 
void gc_mark_all_programs(); 
void gc_free_all_unreferenced_programs(); 
/* Prototypes end here */ 
 
 
void my_yyerror(char *fmt,...) ATTRIBUTE((format (printf, 1, 2))); 
 
#endif