1 /* src/vm/jit/x86_64/md-abi.c - functions for x86_64 Linux ABI
3 Copyright (C) 1996-2005, 2006 R. Grafl, A. Krall, C. Kruegel,
4 C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
5 E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
6 J. Wenninger, Institut f. Computersprachen - TU Wien
8 This file is part of CACAO.
10 This program is free software; you can redistribute it and/or
11 modify it under the terms of the GNU General Public License as
12 published by the Free Software Foundation; either version 2, or (at
13 your option) any later version.
15 This program is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
25 Contact: cacao@cacaojvm.org
27 Authors: Christian Thalinger
31 $Id: md-abi.c 7283 2007-02-04 19:41:14Z pm $
39 #include "vm/jit/s390/md-abi.h"
41 #include "vm/descriptor.h"
42 #include "vm/global.h"
45 /* register descripton array **************************************************/
48 /* r0, itmp1, a0, a1, a2, a3, a4, s0, */
49 REG_TMP, REG_RES, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_SAV,
50 /* s1, s2, s3, s4, itmp2, pv, ra/itmp3, sp */
51 REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_RES, REG_RES, REG_RES, REG_RES,
56 s4 nregdescfloat[] = {
57 REG_ARG, REG_TMP, REG_ARG, REG_TMP, REG_SAV, REG_TMP, REG_SAV, REG_TMP,
58 REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP,
63 /* md_param_alloc **************************************************************
67 *******************************************************************************/
69 void md_param_alloc(methoddesc *md)
77 /* set default values */
83 /* get params field of methoddesc */
87 for (i = 0; i < md->paramcount; i++, pd++) {
88 switch (md->paramtypes[i].type) {
92 if (iarg < INT_ARG_CNT) {
98 pd->regoff = stacksize;
100 if (iarg < INT_ARG_CNT)
108 if (farg < FLT_ARG_CNT) {
109 pd->inmemory = false;
114 pd->regoff = stacksize;
116 if (farg < FLT_ARG_CNT)
124 /* Since XMM0 (==A0) is used for passing return values, this
125 argument register usage has to be regarded, too. */
127 if (IS_FLT_DBL_TYPE(md->returntype.type))
131 /* fill register and stack usage */
133 md->argintreguse = iarg;
134 md->argfltreguse = farg;
135 md->memuse = stacksize;
139 /* md_return_alloc *************************************************************
141 Precolor the Java Stackelement containing the Return Value. Only
142 for float/ double types straight forward possible, since INT_LNG
143 types use "reserved" registers Float/Double values use a00 as
147 jd: jitdata of the current method
148 stackslot: Java Stackslot to contain the Return Value
151 if precoloring was possible:
152 VAR(stackslot->varnum)->flags = PREALLOC
153 ->vv.regoff = [REG_RESULT|REG_FRESULT]
154 rd->arg[flt|int]reguse set to a value according the register usage
156 NOTE: Do not pass a LOCALVAR in stackslot->varnum.
158 *******************************************************************************/
160 void md_return_alloc(jitdata *jd, stackptr stackslot)
166 /* get required compiler data */
173 /* precoloring only straightforward possible with flt/dbl types
174 For Address/Integer/Long REG_RESULT == rax == REG_ITMP1 and so
175 could be destroyed if the return value Stack Slot "lives too
178 if (IS_FLT_DBL_TYPE(md->returntype.type)) {
179 /* In Leafmethods Local Vars holding parameters are precolored
180 to their argument register -> so leafmethods with
181 paramcount > 0 could already use a00! */
183 if (!jd->isleafmethod || (md->paramcount == 0)) {
184 /* Only precolor the stackslot, if it is not a SAVEDVAR
185 <-> has not to survive method invokations */
187 if (!(stackslot->flags & SAVEDVAR)) {
189 VAR(stackslot->varnum)->flags = PREALLOC;
192 if (rd->argfltreguse < 1)
193 rd->argfltreguse = 1;
195 VAR(stackslot->varnum)->vv.regoff = REG_FRESULT;
203 * These are local overrides for various environment variables in Emacs.
204 * Please do not remove this and leave it at the end of the file, where
205 * Emacs will automagically detect them.
206 * ---------------------------------------------------------------------
209 * indent-tabs-mode: t