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Dependencies:   mbed

src/vm/frame.h@1:979fdbf19fdf, 2010-07-26 (annotated)

Committer:
dadaista
Date:
Mon Jul 26 15:33:32 2010 +0000
Revision:
1:979fdbf19fdf
Parent:
0:14e5e829dffe 

        

        
Who changed what in which revision?

        

            
                
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/*





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# This file is Copyright 2003, 2006, 2007, 2009 Dean Hall.





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#





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# This file is part of the PyMite VM.





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# The PyMite VM is free software: you can redistribute it and/or modify





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# it under the terms of the GNU GENERAL PUBLIC LICENSE Version 2.





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#





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# The PyMite VM is distributed in the hope that it will be useful,





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# but WITHOUT ANY WARRANTY; without even the implied warranty of





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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.





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# A copy of the GNU GENERAL PUBLIC LICENSE Version 2





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# is seen in the file COPYING in this directory.





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*/





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#ifndef __FRAME_H__





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#define __FRAME_H__





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/**





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 * \file





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 * \brief VM Frame





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 *





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 * VM frame header.





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 */





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/**





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 * The maximum number of local variables a native function can have.





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 * This defines the length of the locals array in the native frame struct.





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 */





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#define NATIVE_MAX_NUM_LOCALS   8





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/**





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 * Block Type





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 *





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 * Numerical values to put in the 'b_type' field of the tPmBlockType struct.





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 */





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typedef enum PmBlockType_e





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{





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    /** Invalid block type */





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    B_INVALID = 0,





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    /** Loop type */





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    B_LOOP,





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    /** Try type */





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    B_TRY





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} PmBlockType_t, *pPmBlockType_t;





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/**





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 * Block





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 *





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 * Extra info for loops and trys (others?)





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 * Frames use linked list of blocks to handle





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 * nested loops and try-catch blocks.





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 */





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typedef struct PmBlock_s





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{





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    /** Obligatory obj descriptor */





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    PmObjDesc_t od;





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    /** Ptr to backup stack ptr */





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    pPmObj_t *b_sp;





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    /** Handler fxn obj */





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    uint8_t const *b_handler;





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    /** Block type */





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    PmBlockType_t b_type:8;





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    /** Next block in stack */





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    struct PmBlock_s *next;





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} PmBlock_t,





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 *pPmBlock_t;





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/**





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 * Frame





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 *





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 * A struct that holds the execution frame of a function, including the stack,





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 * local vars and pointer to the code object.





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 *





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 * This struct doesn't declare the stack.





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 * frame_new() is responsible for allocating the extra memory





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 * at the tail of fo_locals[] to hold both the locals and stack.





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 */





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typedef struct PmFrame_s





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{





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    /** Obligatory obj descriptor */





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    PmObjDesc_t od;





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    /** Ptr to previous frame obj */





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    struct PmFrame_s *fo_back;





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    /** Ptr to fxn obj */





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    pPmFunc_t fo_func;





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    /** Mem space where func's CO comes from */





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    PmMemSpace_t fo_memspace:8;





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    /** Instrxn ptr (pts into memspace) */





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    uint8_t const *fo_ip;





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    /** Linked list of blocks */





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    pPmBlock_t fo_blockstack;





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    /** Local attributes dict (non-fast locals) */





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    pPmDict_t fo_attrs;





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    /** Global attributes dict (pts to root frame's globals */





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    pPmDict_t fo_globals;





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    /** Points to next empty slot in fo_locals (1 past TOS) */





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    pPmObj_t *fo_sp;





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    /** Frame can be an import-frame that handles RETURN differently */





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    uint8_t fo_isImport:1;





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#ifdef HAVE_CLASSES





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    /** Flag to indicate class initailzer frame; handle RETURN differently */





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    uint8_t fo_isInit:1;





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#endif /* HAVE_CLASSES */





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    /** Array of local vars and stack (space appended at alloc) */





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    pPmObj_t fo_locals[1];





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    /* WARNING: Do not put new fields below fo_locals */





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} PmFrame_t,





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 *pPmFrame_t;





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/**





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 * Native Frame





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 *





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 * A struct that holds the execution frame of a native function,





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 * including the args and single stack slot, and pointer to the code object.





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 *





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 * This struct doesn't need an OD because it is only used statically in the





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 * globals struct.  There's only one native frame, the global one.





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 * This happens because a native function is a leaf node





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 * in the call tree (a native func can't call python funcs).





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 */





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typedef struct PmNativeFrame_s





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{





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    /** Object descriptor */





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    PmObjDesc_t od;





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    /** Ptr to previous frame obj */





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    struct PmFrame_s *nf_back;





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    /** Ptr to fxn obj */





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    pPmFunc_t nf_func;





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    /** Single stack slot */





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    pPmObj_t nf_stack;





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    /** Boolean to indicate if the native frame is active */





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    uint8_t nf_active;





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    /** Number of args passed to the native function */





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    uint8_t nf_numlocals;





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    /** Local vars */





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    pPmObj_t nf_locals[NATIVE_MAX_NUM_LOCALS];





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} PmNativeFrame_t,





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 *pPmNativeFrame_t;





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/**





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 * Allocate space for a new frame, fill its fields





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 * with respect to the given function object.





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 * Return pointer to the new frame.





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 *





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 * @param   pfunc ptr to Function object.





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 * @param   r_pobj Return value; the new frame.





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 * @return  Return status.





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 */





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PmReturn_t frame_new(pPmObj_t pfunc, pPmObj_t *r_pobj);





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#endif /* __FRAME_H__ */