| /* |
| * Copyright (c) 2001, 2004, 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.interpreter; |
| |
| import sun.jvm.hotspot.oops.*; |
| import sun.jvm.hotspot.utilities.*; |
| import sun.jvm.hotspot.runtime.VM; |
| |
| public class Bytecode { |
| Method method; |
| int bci; |
| static final int jintSize = 4; |
| static final String spaces = " "; |
| static final String comma = ", "; |
| |
| Bytecode(Method method, int bci) { |
| this.method = method; |
| this.bci = bci; |
| } |
| |
| // Address computation |
| // NOTE: assumes that the start of the method's bytecodes is 4-byte aligned |
| int alignedOffset(int offset) { |
| return Bits.roundTo(bci + offset, jintSize) - bci; |
| } |
| |
| public int getIndexU1() { return method.getBytecodeOrBPAt(bci() + 1) & 0xFF; } |
| public int getIndexU2(int bc, boolean isWide) { |
| if (can_use_native_byte_order(bc, isWide)) { |
| return method.getNativeShortArg(bci() + (isWide ? 2 : 1)) & 0xFFFF; |
| } |
| return method.getBytecodeShortArg(bci() + (isWide ? 2 : 1)) & 0xFFFF; |
| } |
| public int getIndexU4() { return method.getNativeIntArg(bci() + 1); } |
| public boolean hasIndexU4() { return code() == Bytecodes._invokedynamic; } |
| |
| public int getIndexU1Cpcache() { return method.getBytecodeOrBPAt(bci() + 1) & 0xFF; } |
| public int getIndexU2Cpcache() { return method.getNativeShortArg(bci() + 1) & 0xFFFF; } |
| |
| static boolean can_use_native_byte_order(int bc, boolean is_wide) { |
| return (VM.getVM().isBigEndian() || Bytecodes.native_byte_order(bc /*, is_wide*/)); |
| } |
| |
| int javaSignedWordAt(int offset) { |
| return method.getBytecodeIntArg(bci + offset); |
| } |
| |
| short javaShortAt(int offset) { |
| return method.getBytecodeShortArg(bci + offset); |
| } |
| |
| byte javaByteAt(int offset) { |
| return method.getBytecodeByteArg(bci + offset); |
| } |
| |
| public Method method() { return method; } |
| public int bci() { return bci; } |
| |
| // hotspot byte code |
| public int code() { |
| return Bytecodes.codeAt(method(), bci()); |
| } |
| |
| // jvm byte code |
| public int javaCode() { |
| return Bytecodes.javaCode(code()); |
| } |
| |
| public String getBytecodeName() { |
| return Bytecodes.name(code()); |
| } |
| |
| public String getJavaBytecodeName() { |
| return Bytecodes.name(javaCode()); |
| } |
| |
| public int getLength() { |
| return Bytecodes.lengthAt(method(), bci()); |
| } |
| |
| public int getJavaLength() { |
| return Bytecodes.javaLengthAt(method(), bci()); |
| } |
| |
| public String toString() { |
| StringBuffer buf = new StringBuffer(getJavaBytecodeName()); |
| if (code() != javaCode()) { |
| buf.append(spaces); |
| buf.append('['); |
| buf.append(getBytecodeName()); |
| buf.append(']'); |
| } |
| return buf.toString(); |
| } |
| } |