home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Linux Cubed Series 8: LINUX Games
/
Linux Cubed Series 8 - LINUX Games.iso
/
games
/
muds
/
lpmud312.tar
/
lpmud312
/
exec.h
< prev
next >
Wrap
C/C++ Source or Header
|
1991-12-12
|
6KB
|
144 lines
/*
* A compiled program consists of several data blocks, all allocated
* contiguos in memory to enhance the working set. At the compilation,
* the blocks will be allocated separately, as the final size is
* unknow. When compilation is done, the blocks will be copied into
* the one big area.
*
* There are 5 different blocks of information for each program:
* 1. The program itself. Consists of machine code instructions for a virtual
* stack machine. The size of the program must not be bigger than
* 65535 bytes, as 16 bit pointers are used. Who would ever need a bigger
* program :-)
* 2. Function names. All local functions that has been defined or called,
* with the address of the function in the program. Inherited functions
* will be found here too, with information of how far up the inherit
* chain that the function was defined.
* 3. String table. All strings used in the program. They are all pointers
* into the shared string area. Thus, they are easily found and deallocated
* when the object is destructed.
* 4. Table of variable names. They all point into the shared string table.
* 5. Line number information. A table which tells at what address every
* line belongs to. The table has the same number of entries as the
* programs has source lines. This is used at errors, to find out the
* line number of the error.
* 6. List of inherited objects.
*/
/*
* When an new object inherits from another, all function definitions
* are copied, and all variable definitions.
* Flags below can't explicitly declared. Flags that can be declared,
* are found with TYPE_ below.
*
* When an object is compiled with type testing NAME_STRICT_TYPES, all
* types are saved of the arguments for that function during compilation.
* If the #pragma save_types is specified, then the types are saved even
* after compilation, to be used when the object is inherited.
*/
#define NAME_INHERITED 0x1 /* Defined by inheritance */
#define NAME_UNDEFINED 0x2 /* Not defined yet */
#define NAME_STRICT_TYPES 0x4 /* Compiled with type testing */
#define NAME_HIDDEN 0x8 /* Not visible for inheritance */
#define NAME_PROTOTYPE 0x10 /* Defined by a prototype only */
struct function {
char *name;
unsigned short offset; /* Address of function,
* or inherit table index when inherited. */
unsigned short flags; /* NAME_ . See above. */
unsigned short num_local; /* Number of local variables */
unsigned short num_arg; /* Number of arguments needed.
-1 arguments means function not defined
in this object. Probably inherited */
unsigned short function_index_offset;
/* Used so that it is possible to quickly find this function
* in the inherited program.
*/
unsigned short type; /* Return type of function. See below. */
};
struct variable {
char *name;
unsigned short type; /* Type of variable. See below. TYPE_ */
unsigned short flags; /* Facts found by the compiler. NAME_ */
};
struct inherit {
struct program *prog;
unsigned short function_index_offset;
unsigned short variable_index_offset;
};
struct program {
int ref; /* Reference count */
#ifdef DEBUG
int extra_ref; /* Used to verify ref count */
#endif
char *program; /* The binary instructions */
char *name; /* Name of file that defined prog */
int id_number; /* used to associate information with
this prog block without needing to
increase the reference count */
unsigned short *line_numbers; /* Line number information */
struct function *functions;
char **strings; /* All strings uses by the program */
struct variable *variable_names; /* All variables defined */
struct inherit *inherit; /* List of inherited prgms */
int total_size; /* Sum of all data in this struct */
int heart_beat; /* Index of the heart beat function.
* -1 means no heart beat
*/
/*
* The types of function arguments are saved where 'argument_types'
* points. It can be a variable number of arguments, so allocation
* is done dynamically. To know where first argument is found for
* function 'n' (number of function), use 'type_start[n]'.
* These two arrays will only be allocated if '#pragma save_types' has
* been specified. This #pragma should be specified in files that are
* commonly used for inheritance. There are several lines of code
* that depends on the type length (16 bits) of 'type_start' (sorry !).
*/
unsigned short *argument_types;
#define INDEX_START_NONE 65535
unsigned short *type_start;
/*
* And now some general size information.
*/
unsigned short program_size; /* size of this instruction code */
unsigned short num_functions;
unsigned short num_strings;
unsigned short num_variables;
unsigned short num_inherited;
};
extern struct program *current_prog;
/*
* Types available. The number '0' is valid as any type. These types
* are only used by the compiler, when type checks are enabled. Compare with
* the run-time types, named T_ interpret.h.
*/
#define TYPE_UNKNOWN 0 /* This type must be casted */
#define TYPE_NUMBER 1
#define TYPE_STRING 2
#define TYPE_VOID 3
#define TYPE_OBJECT 4
#define TYPE_ANY 5 /* Will match any type */
/*
* These are or'ed in on top of the basic type.
*/
#define TYPE_MOD_STATIC 0x0100 /* Static function or variable */
#define TYPE_MOD_NO_MASK 0x0200 /* The nomask => not redefineable */
#define TYPE_MOD_POINTER 0x0400 /* Pointer to a basic type */
#define TYPE_MOD_PRIVATE 0x0800 /* Can't be inherited */
#define TYPE_MOD_PROTECTED 0x1000
#define TYPE_MOD_PUBLIC 0x2000 /* Force inherit through private */
#define TYPE_MOD_VARARGS 0x4000 /* Used for type checking */
#define TYPE_MOD_MASK (~(TYPE_MOD_STATIC | TYPE_MOD_NO_MASK |\
TYPE_MOD_PRIVATE | TYPE_MOD_PROTECTED |\
TYPE_MOD_PUBLIC | TYPE_MOD_VARARGS))