frame.h

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/*
# This file is Copyright 2003, 2006, 2007, 2009 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 __FRAME_H__
#define __FRAME_H__


#define NATIVE_MAX_NUM_LOCALS   8


typedef enum PmBlockType_e
{
    B_INVALID = 0,

    B_LOOP,

    B_TRY
} PmBlockType_t, *pPmBlockType_t;


typedef struct PmBlock_s
{
    PmObjDesc_t od;

    pPmObj_t *b_sp;

    uint8_t const *b_handler;

    PmBlockType_t b_type:8;

    struct PmBlock_s *next;
} PmBlock_t,
 *pPmBlock_t;


typedef struct PmFrame_s
{
    PmObjDesc_t od;

    struct PmFrame_s *fo_back;

    pPmFunc_t fo_func;

    PmMemSpace_t fo_memspace:8;

    uint8_t const *fo_ip;

    pPmBlock_t fo_blockstack;

    pPmDict_t fo_attrs;

    pPmDict_t fo_globals;

    pPmObj_t *fo_sp;

    uint8_t fo_isImport:1;

#ifdef HAVE_CLASSES

    uint8_t fo_isInit:1;
#endif /* HAVE_CLASSES */

    pPmObj_t fo_locals[1];
    /* WARNING: Do not put new fields below fo_locals */
} PmFrame_t,
 *pPmFrame_t;


typedef struct PmNativeFrame_s
{
    PmObjDesc_t od;

    struct PmFrame_s *nf_back;

    pPmFunc_t nf_func;

    pPmObj_t nf_stack;

    uint8_t nf_active;

    uint8_t nf_numlocals;

    pPmObj_t nf_locals[NATIVE_MAX_NUM_LOCALS];
} PmNativeFrame_t,
 *pPmNativeFrame_t;


PmReturn_t frame_new(pPmObj_t pfunc, pPmObj_t *r_pobj);

#endif /* __FRAME_H__ */