/*
* jit-interp.h - Bytecode interpreter for platforms without native support.
*
* Copyright (C) 2004 Southern Storm Software, Pty Ltd.
*
* This file is part of the libjit library.
*
* The libjit library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 2.1 of
* the License, or (at your option) any later version.
*
* The libjit library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with the libjit library. If not, see
* .
*/
#ifndef _JIT_INTERP_H
#define _JIT_INTERP_H
#include "jit-internal.h"
#include "jit-apply-rules.h"
#include "jit-interp-opcode.h"
#ifdef __cplusplus
extern "C" {
#endif
/*
* Structure of a stack item.
*/
typedef union
{
jit_int int_value;
jit_uint uint_value;
jit_long long_value;
jit_ulong ulong_value;
jit_float32 float32_value;
jit_float64 float64_value;
jit_nfloat nfloat_value;
void *ptr_value;
#if JIT_APPLY_MAX_STRUCT_IN_REG != 0
char struct_value[JIT_APPLY_MAX_STRUCT_IN_REG];
#endif
} jit_item;
/*
* Number of items that make up a struct or union value on the stack.
*/
#define JIT_NUM_ITEMS_IN_STRUCT(size) \
(((size) + (sizeof(jit_item) - 1)) / sizeof(jit_item))
/*
* Information that is prefixed to a function that describes
* its interpretation context. The code starts just after this.
*/
typedef struct jit_function_interp *jit_function_interp_t;
struct jit_function_interp
{
/* The function that this structure is associated with */
jit_function_t func;
/* Size of the argument area to allocate, in bytes */
unsigned int args_size;
/* Size of the local stack frame to allocate, in bytes */
unsigned int frame_size;
/* Size of the working stack area of the frame, in items */
unsigned int working_area;
};
/*
* Get the size of the "jit_function_interp" structure, rounded
* up to a multiple of "void *".
*/
#define jit_function_interp_size \
((sizeof(struct jit_function_interp) + sizeof(void *) - 1) & \
~(sizeof(void *) - 1))
/*
* Get the entry point for a function, from its "jit_function_interp_t" block.
*/
#define jit_function_interp_entry_pc(info) \
((void **)(((unsigned char *)(info)) + jit_function_interp_size))
#ifdef __cplusplus
};
#endif
#endif /* _JIT_INTERP_H */