mirror of
https://bitbucket.org/librepilot/librepilot.git
synced 2024-11-30 08:24:11 +01:00
1e78cc7a30
git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@2364 ebee16cc-31ac-478f-84a7-5cbb03baadba
375 lines
10 KiB
C
375 lines
10 KiB
C
/*
|
|
# This file is Copyright 2003, 2006, 2007, 2009, 2010 Dean Hall.
|
|
#
|
|
# This file is part of the PyMite VM.
|
|
# The PyMite VM is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU GENERAL PUBLIC LICENSE Version 2.
|
|
#
|
|
# The PyMite VM 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.
|
|
# A copy of the GNU GENERAL PUBLIC LICENSE Version 2
|
|
# is seen in the file COPYING in this directory.
|
|
*/
|
|
|
|
|
|
#ifndef __OBJ_H__
|
|
#define __OBJ_H__
|
|
|
|
|
|
/**
|
|
* \file
|
|
* \brief Object Type
|
|
*
|
|
* Object type header.
|
|
*/
|
|
|
|
|
|
/** Object descriptor field constants */
|
|
#define OD_MARK_SHIFT 14
|
|
#define OD_FREE_SHIFT 15
|
|
#define OD_MARK_BIT (uint16_t)(1 << OD_MARK_SHIFT)
|
|
#define OD_FREE_BIT (uint16_t)(1 << OD_FREE_SHIFT)
|
|
#define OD_SIZE_MASK (uint16_t)(0x01FF)
|
|
#define OD_TYPE_MASK (uint16_t)(0x3E00)
|
|
#define OD_TYPE_SHIFT 9
|
|
|
|
/** Heap descriptor size mask */
|
|
#define HD_SIZE_MASK (uint16_t)(0x3FFF)
|
|
|
|
|
|
/**
|
|
* Gets the free bit of the given object to the given value.
|
|
* If the object is marked free, it is not being used by the VM.
|
|
*/
|
|
#define OBJ_GET_FREE(pobj) \
|
|
((((pPmObj_t)pobj)->od >> OD_FREE_SHIFT) & (uint8_t)1)
|
|
|
|
/**
|
|
* Sets the free bit of the given object to the given value.
|
|
* Setting the free bit means that the object will use the heap descriptor
|
|
* structure instead of the object descriptor structure.
|
|
*/
|
|
#define OBJ_SET_FREE(pobj, free) \
|
|
do \
|
|
{ \
|
|
((pPmObj_t)pobj)->od = ((uint8_t)free) \
|
|
? ((pPmObj_t)pobj)->od | OD_FREE_BIT \
|
|
: ((pPmObj_t)pobj)->od & ~OD_FREE_BIT;\
|
|
} \
|
|
while (0)
|
|
|
|
/*
|
|
* #99: od_size bits are shifted because size is a scaled value
|
|
* True size is always a multiple of 4, so the lower two bits are ignored
|
|
* and two more significant bits are gained.
|
|
*/
|
|
/**
|
|
* Gets the size of the chunk in bytes.
|
|
* Tests whether the object is free as that determines whether the chunk is
|
|
* using an object descriptor or a heap descriptor. Heap descriptors have
|
|
* a larger size field and use a different bit mask than object descriptors.
|
|
*/
|
|
#define OBJ_GET_SIZE(pobj) \
|
|
((((pPmObj_t)pobj)->od & OD_FREE_BIT) \
|
|
? ((((pPmObj_t)pobj)->od & HD_SIZE_MASK) << 2) \
|
|
: ((((pPmObj_t)pobj)->od & OD_SIZE_MASK) << 2))
|
|
|
|
/**
|
|
* Sets the size of the chunk in bytes.
|
|
* Tests whether the object is free as that determines whether the chunk is
|
|
* using an object descriptor or a heap descriptor. Heap descriptors have
|
|
* a larger size field and use a different bit mask than object descriptors.
|
|
*/
|
|
#define OBJ_SET_SIZE(pobj, size) \
|
|
do \
|
|
{ \
|
|
if (((pPmObj_t)pobj)->od & OD_FREE_BIT) \
|
|
{ \
|
|
((pPmObj_t)pobj)->od &= ~HD_SIZE_MASK; \
|
|
((pPmObj_t)pobj)->od |= (((size) >> 2) & HD_SIZE_MASK); \
|
|
} \
|
|
else \
|
|
{ \
|
|
((pPmObj_t)pobj)->od &= ~OD_SIZE_MASK; \
|
|
((pPmObj_t)pobj)->od |= (((size) >> 2) & OD_SIZE_MASK); \
|
|
} \
|
|
} \
|
|
while (0)
|
|
|
|
/**
|
|
* Gets the type of the object
|
|
* This MUST NOT be called on objects that are free.
|
|
*/
|
|
#define OBJ_GET_TYPE(pobj) \
|
|
(((((pPmObj_t)pobj)->od) & OD_TYPE_MASK) >> OD_TYPE_SHIFT)
|
|
|
|
/**
|
|
* Sets the type of the object
|
|
* This MUST NOT be called on objects that are free.
|
|
*/
|
|
#define OBJ_SET_TYPE(pobj, type) \
|
|
do \
|
|
{ \
|
|
((pPmObj_t)pobj)->od &= ~OD_TYPE_MASK; \
|
|
((pPmObj_t)pobj)->od |= (((type) << OD_TYPE_SHIFT) & OD_TYPE_MASK); \
|
|
} \
|
|
while (0)
|
|
|
|
|
|
/**
|
|
* Object type enum
|
|
*
|
|
* These values go in the od_type fields of the obj descriptor.
|
|
* Be sure these values correspond to those in the image creator
|
|
* tool.
|
|
* The hashable types are grouped together for convenience.
|
|
*
|
|
* WARNING: od_type must be at most 5 bits! (must be < 0x20)
|
|
*/
|
|
typedef enum PmType_e
|
|
{
|
|
OBJ_TYPE_HASHABLE_MIN = 0x00,
|
|
|
|
/** None */
|
|
OBJ_TYPE_NON = 0x00,
|
|
|
|
/** Signed integer */
|
|
OBJ_TYPE_INT = 0x01,
|
|
|
|
/** Floating point 32b */
|
|
OBJ_TYPE_FLT = 0x02,
|
|
|
|
/** String */
|
|
OBJ_TYPE_STR = 0x03,
|
|
|
|
/** Tuple (immutable sequence) */
|
|
OBJ_TYPE_TUP = 0x04,
|
|
|
|
/** Code obj */
|
|
OBJ_TYPE_COB = 0x05,
|
|
|
|
/** Module obj */
|
|
OBJ_TYPE_MOD = 0x06,
|
|
|
|
/** Class obj */
|
|
OBJ_TYPE_CLO = 0x07,
|
|
|
|
/** Function obj (callable) */
|
|
OBJ_TYPE_FXN = 0x08,
|
|
|
|
/** Class instance */
|
|
OBJ_TYPE_CLI = 0x09,
|
|
|
|
/** Code image in static memory */
|
|
OBJ_TYPE_CIM = 0x0A,
|
|
|
|
/** Native function image */
|
|
OBJ_TYPE_NIM = 0x0B,
|
|
|
|
/** Native function object */
|
|
OBJ_TYPE_NOB = 0x0C,
|
|
|
|
/** Thread */
|
|
OBJ_TYPE_THR = 0x0D,
|
|
|
|
/** Boolean object */
|
|
OBJ_TYPE_BOOL = 0x0F,
|
|
|
|
/** Code image object */
|
|
OBJ_TYPE_CIO = 0x10,
|
|
|
|
/** Method object */
|
|
OBJ_TYPE_MTH = 0x11,
|
|
|
|
/* All types after this are not hashable */
|
|
OBJ_TYPE_HASHABLE_MAX = 0x11,
|
|
|
|
/** List (mutable sequence) */
|
|
OBJ_TYPE_LST = 0x12,
|
|
|
|
/** Dictionary (hash table) */
|
|
OBJ_TYPE_DIC = 0x13,
|
|
|
|
#ifdef HAVE_BYTEARRAY
|
|
/** Bytearray (mutable) */
|
|
OBJ_TYPE_BYA = 0x14,
|
|
#endif /* HAVE_BYTEARRAY */
|
|
|
|
/* All types after this are not accessible to the user */
|
|
OBJ_TYPE_ACCESSIBLE_MAX = 0x18,
|
|
|
|
#ifdef HAVE_BYTEARRAY
|
|
/** Bytes (mutable container for Bytearray type) */
|
|
OBJ_TYPE_BYS = 0x18,
|
|
#endif /* HAVE_BYTEARRAY */
|
|
|
|
/** Frame type */
|
|
OBJ_TYPE_FRM = 0x19,
|
|
|
|
/** Block type (for,while,try,etc) */
|
|
OBJ_TYPE_BLK = 0x1A,
|
|
|
|
/** Segment (within a seglist) */
|
|
OBJ_TYPE_SEG = 0x1B,
|
|
|
|
/** Seglist */
|
|
OBJ_TYPE_SGL = 0x1C,
|
|
|
|
/** Sequence iterator */
|
|
OBJ_TYPE_SQI = 0x1D,
|
|
|
|
/** Native frame (there is only one) */
|
|
OBJ_TYPE_NFM = 0x1E,
|
|
} PmType_t, *pPmType_t;
|
|
|
|
|
|
/**
|
|
* Object Descriptor
|
|
*
|
|
* All active PyMite "objects" must have this at the top of their struct.
|
|
* (CodeObj, Frame, Dict, List, Tuple, etc.).
|
|
*
|
|
* The following is a diagram of the object descriptor:
|
|
* \verbatim
|
|
* MSb LSb
|
|
* 7 6 5 4 3 2 1 0
|
|
* pchunk-> +-+-+-+-+-+-+-+-+ S := Size of the chunk (2 LSbs dropped)
|
|
* | S[9:2] | F := Free bit
|
|
* +-+-+---------+-+ M := GC Mark bit
|
|
* |F|M| T |S| T := Object type (PyMite specific)
|
|
* +-+-+---------+-+
|
|
* | object data |
|
|
* ... ...
|
|
* | end data | Theoretical min size == 2
|
|
* +---------------+ Effective min size == 8
|
|
* (due to pmHeapDesc_t)
|
|
* \endverbatim
|
|
* Macros are used to get and set field values.
|
|
* Using macros eliminates declaring bit fields which fails on some compilers.
|
|
*/
|
|
typedef uint16_t PmObjDesc_t,
|
|
*pPmObjDesc_t;
|
|
|
|
/**
|
|
* Object
|
|
*
|
|
* The abstract empty object type for PyMite.
|
|
*/
|
|
typedef struct PmObj_s
|
|
{
|
|
/** Object descriptor */
|
|
PmObjDesc_t od;
|
|
} PmObj_t,
|
|
*pPmObj_t;
|
|
|
|
/** Boolean object */
|
|
typedef struct PmBoolean_s
|
|
{
|
|
/** Object descriptor */
|
|
PmObjDesc_t od;
|
|
|
|
/** Boolean value */
|
|
int32_t val;
|
|
}
|
|
PmBoolean_t, *pPmBoolean_t;
|
|
|
|
|
|
/**
|
|
* Loads an object from an image in memory.
|
|
* Return pointer to object.
|
|
* Leave add pointing one byte past end of obj.
|
|
*
|
|
* The following lists the simple object types
|
|
* and their image structures:
|
|
* -None:
|
|
* -type: int8_t - OBJ_TYPE_NON
|
|
*
|
|
* -Int:
|
|
* -type: int8_t - OBJ_TYPE_INT
|
|
* -value: int32_t - signed integer value
|
|
*
|
|
* -Float:
|
|
* -type: int8_t - OBJ_TYPE_FLOAT
|
|
* -value: float32_t - 32-bit floating point value
|
|
*
|
|
* -Slice (is this allowed in img?):
|
|
* -type: int8_t - OBJ_TYPE_SLICE
|
|
* -index1: int16_t - first index.
|
|
* -index2: int16_t - second index.
|
|
*
|
|
* @param memspace memory space/type
|
|
* @param paddr ptr to ptr to obj
|
|
* return by reference: paddr pts to
|
|
* first byte after obj
|
|
* @param r_pobj Return arg, the loaded object.
|
|
* @return Return status
|
|
*/
|
|
PmReturn_t obj_loadFromImg(PmMemSpace_t memspace,
|
|
uint8_t const **paddr, pPmObj_t *r_pobj);
|
|
|
|
/**
|
|
* Loads a code object from a code image object
|
|
*
|
|
* @param pimg Ptr to a code image object
|
|
* @param r_pobj Return arg, the loaded object
|
|
* @return Returns status
|
|
*/
|
|
PmReturn_t obj_loadFromImgObj(pPmObj_t pimg, pPmObj_t *r_pobj);
|
|
|
|
/**
|
|
* Finds the boolean value of the given object.
|
|
*
|
|
* @param pobj Ptr to object to test.
|
|
* @return Nonzero value if object is False.
|
|
*/
|
|
int8_t obj_isFalse(pPmObj_t pobj);
|
|
|
|
/**
|
|
* Returns the boolean true if the item is in the object
|
|
*
|
|
* @param pobj Ptr to container object
|
|
* @param pitem Ptr to item
|
|
*/
|
|
PmReturn_t obj_isIn(pPmObj_t pobj, pPmObj_t pitem);
|
|
|
|
/**
|
|
* Compares two objects for equality.
|
|
*
|
|
* @param pobj1 Ptr to first object.
|
|
* @param pobj2 Ptr to second object.
|
|
* @return C_SAME if the items are equivalent, C_DIFFER otherwise.
|
|
*/
|
|
int8_t obj_compare(pPmObj_t pobj1, pPmObj_t pobj2);
|
|
|
|
/**
|
|
* Print an object, thereby using objects helpers.
|
|
*
|
|
* @param pobj Ptr to object for printing.
|
|
* @param is_expr_repr Influences the way None and strings are printed.
|
|
* If 0, None is printed, strings are printed.
|
|
* If 1, None is not printed and strings are printed
|
|
* surrounded with single quotes and unprintable
|
|
* characters are escaped.
|
|
* @param is_nested Influences the way None and strings are printed.
|
|
* If 1, None will be printed and strings will be
|
|
* surrounded with single quotes and escaped.
|
|
* This argument overrides the is_expr_repr argument.
|
|
* @return Return status
|
|
*/
|
|
PmReturn_t obj_print(pPmObj_t pobj, uint8_t is_expr_repr, uint8_t is_nested);
|
|
|
|
#ifdef HAVE_BACKTICK
|
|
/**
|
|
* Returns by reference a string object that is the human-readable
|
|
* representation of the object. Used by the backtick operation (UNARY_CONVERT).
|
|
*
|
|
* @param pobj Ptr to object to represent
|
|
* @param r_pstr Return arg, the string object
|
|
* @return Return status
|
|
*/
|
|
PmReturn_t obj_repr(pPmObj_t pobj, pPmObj_t *r_pstr);
|
|
#endif /* HAVE_BACKTICK */
|
|
|
|
#endif /* __OBJ_H__ */
|