| /* |
| * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.runtime; |
| |
| import sun.jvm.hotspot.oops.*; |
| |
| /** Specialized SignatureIterator: Used for native call purposes */ |
| |
| public abstract class NativeSignatureIterator extends SignatureIterator { |
| private Method method; |
| // [RGV] We need seperate JNI and Java offset values because in 64 bit mode, the argument offsets |
| // are not in sync with the Java stack. For example a long takes up 1 "C" stack entry |
| // but 2 Java stack entries. |
| private int offset; // The java stack offset |
| private int prepended; // number of prepended JNI parameters (1 JNIEnv, plus 1 mirror if static) |
| private int jni_offset; // the current parameter offset, starting with 0 |
| |
| public void doBool () { passInt(); jni_offset++; offset++; } |
| public void doChar () { passInt(); jni_offset++; offset++; } |
| public void doFloat () { |
| if (VM.getVM().isLP64()) { |
| passFloat(); |
| } else { |
| passInt(); |
| } |
| jni_offset++; offset++; |
| } |
| |
| public void doDouble() { |
| if (VM.getVM().isLP64()) { |
| passDouble(); jni_offset++; offset += 2; |
| } else { |
| passDouble(); jni_offset += 2; offset += 2; |
| } |
| } |
| |
| public void doByte () { passInt(); jni_offset++; offset++; } |
| public void doShort () { passInt(); jni_offset++; offset++; } |
| public void doInt () { passInt(); jni_offset++; offset++; } |
| |
| public void doLong () { |
| if (VM.getVM().isLP64()) { |
| passLong(); jni_offset++; offset += 2; |
| } else { |
| passLong(); jni_offset += 2; offset += 2; |
| } |
| } |
| |
| public void doVoid () { throw new RuntimeException("should not reach here"); } |
| public void doObject(int begin, int end) { passObject(); jni_offset++; offset++; } |
| public void doArray (int begin, int end) { passObject(); jni_offset++; offset++; } |
| |
| public Method method() { return method; } |
| public int offset() { return offset; } |
| public int jniOffset() { return jni_offset + prepended; } |
| public boolean isStatic() { return method.isStatic(); } |
| |
| public abstract void passInt(); |
| public abstract void passLong(); |
| public abstract void passObject(); |
| public abstract void passFloat(); |
| public abstract void passDouble(); |
| |
| public NativeSignatureIterator(Method method) { |
| super(method.getSignature()); |
| this.method = method; |
| offset = 0; |
| jni_offset = 0; |
| |
| int JNIEnv_words = 1; |
| int mirror_words = 1; |
| prepended = !isStatic() ? JNIEnv_words : JNIEnv_words + mirror_words; |
| } |
| |
| // iterate() calles the 2 virtual methods according to the following invocation syntax: |
| // |
| // {pass_int | pass_long | pass_object} |
| // |
| // Arguments are handled from left to right (receiver first, if any). |
| // The offset() values refer to the Java stack offsets but are 0 based and increasing. |
| // The java_offset() values count down to 0, and refer to the Java TOS. |
| // The jni_offset() values increase from 1 or 2, and refer to C arguments. |
| public void iterate() { |
| if (!isStatic()) { |
| // handle receiver (not handled by iterate because not in signature) |
| passObject(); jni_offset++; offset++; |
| } |
| iterateParameters(); |
| } |
| } |