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1 /*
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2 * Copyright 2001 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 package sun.jvm.hotspot.runtime;
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26
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27 import sun.jvm.hotspot.oops.*;
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28
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29 /** Specialized SignatureIterator: Used for native call purposes */
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30
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31 public abstract class NativeSignatureIterator extends SignatureIterator {
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32 private Method method;
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33 // [RGV] We need seperate JNI and Java offset values because in 64 bit mode, the argument offsets
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34 // are not in sync with the Java stack. For example a long takes up 1 "C" stack entry
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35 // but 2 Java stack entries.
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36 private int offset; // The java stack offset
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37 private int prepended; // number of prepended JNI parameters (1 JNIEnv, plus 1 mirror if static)
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38 private int jni_offset; // the current parameter offset, starting with 0
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39
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40 public void doBool () { passInt(); jni_offset++; offset++; }
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41 public void doChar () { passInt(); jni_offset++; offset++; }
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42 public void doFloat () {
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43 if (VM.getVM().isLP64()) {
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44 passFloat();
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45 } else {
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46 passInt();
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47 }
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48 jni_offset++; offset++;
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49 }
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50
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51 public void doDouble() {
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52 if (VM.getVM().isLP64()) {
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53 passDouble(); jni_offset++; offset += 2;
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54 } else {
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55 passDouble(); jni_offset += 2; offset += 2;
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56 }
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57 }
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58
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59 public void doByte () { passInt(); jni_offset++; offset++; }
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60 public void doShort () { passInt(); jni_offset++; offset++; }
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61 public void doInt () { passInt(); jni_offset++; offset++; }
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62
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63 public void doLong () {
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64 if (VM.getVM().isLP64()) {
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65 passLong(); jni_offset++; offset += 2;
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66 } else {
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67 passLong(); jni_offset += 2; offset += 2;
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68 }
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69 }
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70
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71 public void doVoid () { throw new RuntimeException("should not reach here"); }
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72 public void doObject(int begin, int end) { passObject(); jni_offset++; offset++; }
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73 public void doArray (int begin, int end) { passObject(); jni_offset++; offset++; }
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74
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75 public Method method() { return method; }
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76 public int offset() { return offset; }
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77 public int jniOffset() { return jni_offset + prepended; }
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78 public boolean isStatic() { return method.isStatic(); }
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79
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80 public abstract void passInt();
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81 public abstract void passLong();
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82 public abstract void passObject();
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83 public abstract void passFloat();
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84 public abstract void passDouble();
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85
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86 public NativeSignatureIterator(Method method) {
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87 super(method.getSignature());
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88 this.method = method;
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89 offset = 0;
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90 jni_offset = 0;
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91
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92 int JNIEnv_words = 1;
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93 int mirror_words = 1;
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94 prepended = !isStatic() ? JNIEnv_words : JNIEnv_words + mirror_words;
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95 }
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96
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97 // iterate() calles the 2 virtual methods according to the following invocation syntax:
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98 //
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99 // {pass_int | pass_long | pass_object}
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100 //
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101 // Arguments are handled from left to right (receiver first, if any).
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102 // The offset() values refer to the Java stack offsets but are 0 based and increasing.
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103 // The java_offset() values count down to 0, and refer to the Java TOS.
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104 // The jni_offset() values increase from 1 or 2, and refer to C arguments.
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105 public void iterate() {
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106 if (!isStatic()) {
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107 // handle receiver (not handled by iterate because not in signature)
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108 passObject(); jni_offset++; offset++;
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109 }
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110 iterateParameters();
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111 }
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112 }
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