md-abi.cpp

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/* src/vm/jit/i386/md-abi.c - functions for i386 Linux ABI

   Copyright (C) 1996-2013
   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.

*/


#include "config.h"
#include "vm/types.hpp"

#include "vm/jit/i386/md-abi.hpp"

#include "vm/descriptor.hpp"
#include "vm/global.hpp"
#include "vm/method.hpp"

#include "vm/jit/abi.hpp"
#include "vm/jit/code.hpp"


/* register descripton - array ************************************************/

s4 nregdescint[] = {
    REG_RET, REG_RES, REG_RES, REG_TMP, REG_RES, REG_SAV, REG_SAV, REG_SAV,
    REG_END
};

const char *abi_registers_integer_name[] = {
    "eax", "ecx", "edx", "ebx", "esp", "ebp", "esi", "edi"
};

const s4 abi_registers_integer_argument[] = {
    -1,
};

const s4 abi_registers_integer_saved[] = {
    5, /* s0 */
    6, /* s1 */
    7, /* s2 */
};

const s4 abi_registers_integer_temporary[] = {
    3, /* t0 */
};


s4 nregdescfloat[] = {
 /* rounding problems with callee saved registers */
 /* REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_TMP, REG_TMP, REG_RES, REG_RES, */
 /* REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_RES, REG_RES, */
    REG_RES, REG_RES, REG_RES, REG_RES, REG_RES, REG_RES, REG_RES, REG_RES,
    REG_END
};

const s4 abi_registers_float_argument[] = {
    -1,
};

const s4 abi_registers_float_saved[] = {
    -1,
};

const s4 abi_registers_float_temporary[] = {
    -1,
};


/* md_param_alloc **************************************************************

   Allocate Arguments to Stackslots according the Calling Conventions

   --- in
   md->paramcount:           Number of arguments for this method
   md->paramtypes[].type:    Argument types
   
   --- out
   md->params[].inmemory:    Argument spilled on stack
   md->params[].regoff:      Stack offset or rd->arg[int|flt]regs index
   md->memuse:               Stackslots needed for argument spilling
   md->argintreguse:         max number of integer arguments used
   md->argfltreguse:         max number of float arguments used

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

void md_param_alloc(methoddesc *md)
{
    paramdesc *pd;
    int        stacksize;
    int        i;

    pd = md->params;
    stacksize = 0;

    for (i = 0; i < md->paramcount; i++, pd++) {
        pd->inmemory = true;
        pd->index    = stacksize;
        pd->regoff   = stacksize * 8;
        stacksize++;
    }

    md->memuse       = stacksize;
    md->argintreguse = 0;
    md->argfltreguse = 0;
}


/* md_param_alloc_native *******************************************************

   Pre-allocate arguments according the native ABI.

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

void md_param_alloc_native(methoddesc *md)
{
    paramdesc *pd;
    int        stacksize;
    int        i;

    pd = md->params;
    stacksize = 0;

    for (i = 0; i < md->paramcount; i++, pd++) {
        pd->inmemory  = true;
        pd->index     = stacksize;
        pd->regoff    = stacksize * 4;
        stacksize    += IS_2_WORD_TYPE(md->paramtypes[i].type) ? 2 : 1;
    }

    md->memuse       = stacksize;
    md->argintreguse = 0;
    md->argfltreguse = 0;
}


/* md_return_alloc *************************************************************

   No straight forward precoloring of the Java Stackelement containing
   the return value possible for i386, since it uses "reserved"
   registers for return values

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

void md_return_alloc(jitdata *jd, stackelement_t *stackslot)
{
    /* nothing */
}


/*
 * These are local overrides for various environment variables in Emacs.
 * Please do not remove this and leave it at the end of the file, where
 * Emacs will automagically detect them.
 * ---------------------------------------------------------------------
 * Local variables:
 * mode: c++
 * indent-tabs-mode: t
 * c-basic-offset: 4
 * tab-width: 4
 * End:
 * vim:noexpandtab:sw=4:ts=4:
 */