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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 // Sentinel placed in the code for interpreter returns so
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28 // that i2c adapters and osr code can recognize an interpreter
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29 // return address and convert the return to a specialized
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30 // block of code to handle compiedl return values and cleaning
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31 // the fpu stack.
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32 static const int return_sentinel;
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33
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34
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35 static Address::ScaleFactor stackElementScale() {
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36 return TaggedStackInterpreter? Address::times_8 : Address::times_4;
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37 }
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38
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39 // Offset from rsp (which points to the last stack element)
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40 static int expr_offset_in_bytes(int i) { return stackElementSize()*i ; }
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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 // Support for Tagged Stacks
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47
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48 // Stack index relative to tos (which points at value)
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49 static int expr_index_at(int i) {
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50 return stackElementWords() * i;
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51 }
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52
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53 static int expr_tag_index_at(int i) {
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54 assert(TaggedStackInterpreter, "should not call this");
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55 // tag is one word above java stack element
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56 return stackElementWords() * i + 1;
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57 }
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58
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59 // Already negated by c++ interpreter
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60 static int local_index_at(int i) {
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61 assert(i<=0, "local direction already negated");
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62 return stackElementWords() * i + (value_offset_in_bytes()/wordSize);
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63 }
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64
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65 static int local_tag_index_at(int i) {
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66 assert(i<=0, "local direction already negated");
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67 assert(TaggedStackInterpreter, "should not call this");
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68 return stackElementWords() * i + (tag_offset_in_bytes()/wordSize);
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69 }
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