executionstate.hpp

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/* src/vm/jit/executionstate.hpp - execution-state handling

   Copyright (C) 2007, 2008, 2009
   CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO

   This file is part of CACAO.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program 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
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

*/


#ifndef EXECUTIONSTATE_HPP_
#define EXECUTIONSTATE_HPP_ 1

#include <stdint.h>                     // for uint8_t, uint64_t, etc
#include "config.h"
#include "arch.hpp"
#include "md-abi.hpp"
#include "vm/global.hpp"                // for java_handle_t

struct codeinfo;
struct executionstate_t;

/* configuration of native stack slot size ************************************/

#define SIZE_OF_STACKSLOT      8
#define STACK_SLOTS_PER_FLOAT  1
typedef uint64_t stackslot_t;


/* executionstate_t ************************************************************

   An execution-state represents the state of a thread containing all
   registers that are important.  This structure is an internal
   structure similar to mcontext_t.

*******************************************************************************/

struct executionstate_t {
    uint8_t   *pc;                                         /* program counter */
    uint8_t   *sp;                             /* stack pointer within method */
    uint8_t   *pv;                             /* procedure value. NULL means */
                                               /* search the AVL tree         */
    uint8_t   *ra;                          /* return address / link register */

    uintptr_t  intregs[INT_REG_CNT];                       /* register values */

#if defined(__AARCH64__)
    long double fltregs[FLT_REG_CNT]; /* on aarch64 FP registers are 128 bit */
#else
    double     fltregs[FLT_REG_CNT];                       /* register values */
#endif

    codeinfo  *code;                      /* codeinfo corresponding to the pv */
};


/* prototypes *****************************************************************/

void executionstate_pop_stackframe(executionstate_t *es);

void executionstate_unwind_exception(executionstate_t* es, java_handle_t* e);

#if !defined(NDEBUG)
void executionstate_sanity_check(void *context);
void executionstate_println(executionstate_t *es);
#endif

/* Machine and OS dependent functions (code in ARCH_DIR/OS_DIR/md-os.c) */

void md_executionstate_read(executionstate_t *es, void *ucontext);
void md_executionstate_write(executionstate_t *es, void *ucontext);

#endif // EXECUTIONSTATE_HPP_


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