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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 public:
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26
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27 // Support for Tagged Stacks
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28
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29 // Stack index relative to tos (which points at value)
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30 static int expr_index_at(int i) {
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31 return stackElementWords() * i;
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32 }
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33
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34 static int expr_tag_index_at(int i) {
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35 assert(TaggedStackInterpreter, "should not call this");
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36 // tag is one word above java stack element
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37 return stackElementWords() * i + 1;
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38 }
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39
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40 static int expr_offset_in_bytes(int i) { return stackElementSize()*i + wordSize; }
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41 static int expr_tag_offset_in_bytes (int i) {
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42 assert(TaggedStackInterpreter, "should not call this");
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43 return expr_offset_in_bytes(i) + wordSize;
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44 }
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45
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46 // Already negated by c++ interpreter
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47 static int local_index_at(int i) {
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48 assert(i<=0, "local direction already negated");
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49 return stackElementWords() * i + (value_offset_in_bytes()/wordSize);
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50 }
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51
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52 static int local_tag_index_at(int i) {
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53 assert(i<=0, "local direction already negated");
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54 assert(TaggedStackInterpreter, "should not call this");
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55 return stackElementWords() * i + (tag_offset_in_bytes()/wordSize);
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56 }
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