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function.h
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function.h
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#ifndef FUNCTION_H
#define FUNCTION_H
#include "stack.h"
#include "config.h"
#include "types.h"
#include "context.h"
#include "queue.h"
enum {
PARAM_GLOBAL,
PARAM_NONBLOCK,
PARAM_MAX,
};
/* operator types */
typedef enum {
OP_FUNCTION,
OP_VARIABLE,
OP_FLOW,
OP_EXPRESSION,
/* we don't need OP_MAX because the opcode is only two bits */
} opcode_t;
/* variable types */
typedef enum {
VAR_WORD,
VAR_BUF,
VAR_ARRAY,
VAR_POINTER,
VAR_MAX,
} vartypes_t;
/* expression types */
typedef enum {
EXP_WORD,
EXP_VAR,
EXP_STRING,
EXP_EXCEPTION_VAR,
EXP_ADDRESSOF,
EXP_DEREF,
EXP_BUF_OFFSET,
EXP_ADD,
EXP_SUB,
EXP_MUL_UNSIGN,
EXP_MUL_SIGN,
EXP_DIV_UNSIGN,
EXP_DIV_SIGN,
EXP_AND,
EXP_XOR,
EXP_OR,
EXP_BOOL_AND,
EXP_BOOL_OR,
EXP_NOT,
EXP_BOOL_NOT,
EXP_MOD,
EXP_CALL_STRING,
EXP_CALL_PTR,
EXP_CALL_END,
EXP_CMP_EQ,
EXP_CMP_UNSIGN,
EXP_CMP_SIGN,
EXP_EXT_SIGN,
EXP_DYN_ALLOC, /* allocate a dynamic buffer */
EXP_RECV_DATA,
EXP_ARGS, /* the number of arguments that was received */
EXP_EXP, /* poitner to an expression. used in case of a function call in a function argument */
EXP_MAX,
} expressiontypes_t;
/* flow types */
typedef enum {
FLOW_ASSIGN,
FLOW_ASSIGN_OFFSET,
FLOW_IF,
FLOW_TRY,
FLOW_WHILE,
FLOW_DYN_FREE, /* free a dynamic buffer */
FLOW_SEND_DATA,
/* block terminators */
FLOW_BLOCKEND,
FLOW_THROW,
FLOW_RET,
FLOW_MAX,
} flowtypes_t;
/* function special types */
typedef enum {
FUNC_VARIABLE_ARGUMENT = 1 << 0,
FUNC_EXTERNAL = 1 << 1,
FUNC_MAX = (FUNC_VARIABLE_ARGUMENT | FUNC_EXTERNAL) + 1,
} function_types_t;
/* a function code */
typedef struct {
byte op : 2;
byte min_args : 5;
byte return_exception_value : 1;
word name;
word error_return;
byte function_type;
} bytecode_func_t;
/* a variable code */
typedef struct {
byte op : 2;
byte type : 5;
byte is_arg : 1;
word size;
word init;
byte flags;
} bytecode_var_t;
/* an expression code */
typedef struct {
byte op : 2;
byte type : 6;
word val1;
word val2;
} bytecode_expression_t;
/* a flow code */
typedef struct {
byte op : 2;
byte type : 6;
word val1;
word val2;
word val3;
} bytecode_flow_t;
/* one bytecode structure */
typedef union {
byte op : 2;
bytecode_func_t func;
bytecode_var_t var;
bytecode_expression_t expression;
bytecode_flow_t flow;
} bytecode_t;
/* a function struct */
typedef struct function_st {
list_head_t list;
atomic_t ref_count;
char *name; /* name */
context_t *cont; /* context */
/* a copy of the bytecode of this function */
union {
bytecode_t *code;
byte *raw;
};
word num_minargs; /* minimum number of arguments number */
word num_maxargs; /* maximum number of arguments number */
word num_vars; /* variables number */
word num_opcodes; /* number of opcodes */
struct queue_head to_user;
struct queue_head to_kernel;
word total_args_size; /* the size of memory needed to store the arguments */
word total_vars_size; /* the size of memory needed to store the all the variables (including the arguments) */
word *string_table; /* points to the string table (the offset of every string in the string's section in the bytecode) */
byte func_code[]; /* the function's wrapper */
} function_t;
/* create a function */
int function_create(bytecode_t *code, word len, function_t **func);
/* increasing the refcount by one */
void function_get(function_t *func);
/* decreasing the refcount by one - and freeing if the refcount is zero */
void function_put(function_t *func);
/* defined in context.c : */
/* add a function to a context */
int context_add_function(context_t *cont, function_t *func);
/* remove and delete a function from the context */
void context_free_function(function_t *func);
#endif