Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/runtime/NativeSignatureIterator.java @ 7353:b5280041f59e
Experiment with soft alignment for branch targets.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sun, 13 Jan 2013 19:32:16 +0100 |
parents | c18cbe5936b8 |
children |
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/* * 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(); } }