/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * * ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Rhino code, released * May 6, 1999. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1997-1999 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Roger Lawrence * * Alternatively, the contents of this file may be used under the terms of * the GNU General Public License Version 2 or later (the "GPL"), in which * case the provisions of the GPL are applicable instead of those above. If * you wish to allow use of your version of this file only under the terms of * the GPL and not to allow others to use your version of this file under the * MPL, indicate your decision by deleting the provisions above and replacing * them with the notice and other provisions required by the GPL. If you do * not delete the provisions above, a recipient may use your version of this * file under either the MPL or the GPL. * * ***** END LICENSE BLOCK ***** */ package org.mozilla.classfile; import org.mozilla.javascript.ObjToIntMap; import org.mozilla.javascript.ObjArray; import org.mozilla.javascript.UintMap; import java.io.*; /** * ClassFileWriter * * A ClassFileWriter is used to write a Java class file. Methods are * provided to create fields and methods, and within methods to write * Java bytecodes. * * @author Roger Lawrence */ public class ClassFileWriter { /** * Thrown for cases where the error in generating the class file is * due to a program size constraints rather than a likely bug in the * compiler. */ public static class ClassFileFormatException extends RuntimeException { ClassFileFormatException(String message) { super(message); } } /** * Construct a ClassFileWriter for a class. * * @param className the name of the class to write, including * full package qualification. * @param superClassName the name of the superclass of the class * to write, including full package qualification. * @param sourceFileName the name of the source file to use for * producing debug information, or null if debug information * is not desired */ public ClassFileWriter(String className, String superClassName, String sourceFileName) { generatedClassName = className; itsConstantPool = new ConstantPool(this); itsThisClassIndex = itsConstantPool.addClass(className); itsSuperClassIndex = itsConstantPool.addClass(superClassName); if (sourceFileName != null) itsSourceFileNameIndex = itsConstantPool.addUtf8(sourceFileName); itsFlags = ACC_PUBLIC; } public final String getClassName() { return generatedClassName; } /** * Add an interface implemented by this class. * * This method may be called multiple times for classes that * implement multiple interfaces. * * @param interfaceName a name of an interface implemented * by the class being written, including full package * qualification. */ public void addInterface(String interfaceName) { short interfaceIndex = itsConstantPool.addClass(interfaceName); itsInterfaces.add(new Short(interfaceIndex)); } public static final short ACC_PUBLIC = 0x0001, ACC_PRIVATE = 0x0002, ACC_PROTECTED = 0x0004, ACC_STATIC = 0x0008, ACC_FINAL = 0x0010, ACC_SYNCHRONIZED = 0x0020, ACC_VOLATILE = 0x0040, ACC_TRANSIENT = 0x0080, ACC_NATIVE = 0x0100, ACC_ABSTRACT = 0x0400; /** * Set the class's flags. * * Flags must be a set of the following flags, bitwise or'd * together: * ACC_PUBLIC * ACC_PRIVATE * ACC_PROTECTED * ACC_FINAL * ACC_ABSTRACT * TODO: check that this is the appropriate set * @param flags the set of class flags to set */ public void setFlags(short flags) { itsFlags = flags; } static String getSlashedForm(String name) { return name.replace('.', '/'); } /** * Convert Java class name in dot notation into * "Lname-with-dots-replaced-by-slashes;" form suitable for use as * JVM type signatures. */ public static String classNameToSignature(String name) { int nameLength = name.length(); int colonPos = 1 + nameLength; char[] buf = new char[colonPos + 1]; buf[0] = 'L'; buf[colonPos] = ';'; name.getChars(0, nameLength, buf, 1); for (int i = 1; i != colonPos; ++i) { if (buf[i] == '.') { buf[i] = '/'; } } return new String(buf, 0, colonPos + 1); } /** * Add a field to the class. * * @param fieldName the name of the field * @param type the type of the field using ... * @param flags the attributes of the field, such as ACC_PUBLIC, etc. * bitwise or'd together */ public void addField(String fieldName, String type, short flags) { short fieldNameIndex = itsConstantPool.addUtf8(fieldName); short typeIndex = itsConstantPool.addUtf8(type); itsFields.add(new ClassFileField(fieldNameIndex, typeIndex, flags)); } /** * Add a field to the class. * * @param fieldName the name of the field * @param type the type of the field using ... * @param flags the attributes of the field, such as ACC_PUBLIC, etc. * bitwise or'd together * @param value an initial integral value */ public void addField(String fieldName, String type, short flags, int value) { short fieldNameIndex = itsConstantPool.addUtf8(fieldName); short typeIndex = itsConstantPool.addUtf8(type); ClassFileField field = new ClassFileField(fieldNameIndex, typeIndex, flags); field.setAttributes(itsConstantPool.addUtf8("ConstantValue"), (short)0, (short)0, itsConstantPool.addConstant(value)); itsFields.add(field); } /** * Add a field to the class. * * @param fieldName the name of the field * @param type the type of the field using ... * @param flags the attributes of the field, such as ACC_PUBLIC, etc. * bitwise or'd together * @param value an initial long value */ public void addField(String fieldName, String type, short flags, long value) { short fieldNameIndex = itsConstantPool.addUtf8(fieldName); short typeIndex = itsConstantPool.addUtf8(type); ClassFileField field = new ClassFileField(fieldNameIndex, typeIndex, flags); field.setAttributes(itsConstantPool.addUtf8("ConstantValue"), (short)0, (short)2, itsConstantPool.addConstant(value)); itsFields.add(field); } /** * Add a field to the class. * * @param fieldName the name of the field * @param type the type of the field using ... * @param flags the attributes of the field, such as ACC_PUBLIC, etc. * bitwise or'd together * @param value an initial double value */ public void addField(String fieldName, String type, short flags, double value) { short fieldNameIndex = itsConstantPool.addUtf8(fieldName); short typeIndex = itsConstantPool.addUtf8(type); ClassFileField field = new ClassFileField(fieldNameIndex, typeIndex, flags); field.setAttributes(itsConstantPool.addUtf8("ConstantValue"), (short)0, (short)2, itsConstantPool.addConstant(value)); itsFields.add(field); } /** * Add Information about java variable to use when generating the local * variable table. * * @param name variable name. * @param type variable type as bytecode descriptor string. * @param startPC the starting bytecode PC where this variable is live, * or -1 if it does not have a Java register. * @param register the Java register number of variable * or -1 if it does not have a Java register. */ public void addVariableDescriptor(String name, String type, int startPC, int register) { int nameIndex = itsConstantPool.addUtf8(name); int descriptorIndex = itsConstantPool.addUtf8(type); int [] chunk = { nameIndex, descriptorIndex, startPC, register }; if (itsVarDescriptors == null) { itsVarDescriptors = new ObjArray(); } itsVarDescriptors.add(chunk); } /** * Add a method and begin adding code. * * This method must be called before other methods for adding code, * exception tables, etc. can be invoked. * * @param methodName the name of the method * @param type a string representing the type * @param flags the attributes of the field, such as ACC_PUBLIC, etc. * bitwise or'd together */ public void startMethod(String methodName, String type, short flags) { short methodNameIndex = itsConstantPool.addUtf8(methodName); short typeIndex = itsConstantPool.addUtf8(type); itsCurrentMethod = new ClassFileMethod(methodNameIndex, typeIndex, flags); itsMethods.add(itsCurrentMethod); } /** * Complete generation of the method. * * After this method is called, no more code can be added to the * method begun with startMethod. * * @param maxLocals the maximum number of local variable slots * (a.k.a. Java registers) used by the method */ public void stopMethod(short maxLocals) { if (itsCurrentMethod == null) throw new IllegalStateException("No method to stop"); fixLabelGotos(); itsMaxLocals = maxLocals; int lineNumberTableLength = 0; if (itsLineNumberTable != null) { // 6 bytes for the attribute header // 2 bytes for the line number count // 4 bytes for each entry lineNumberTableLength = 6 + 2 + (itsLineNumberTableTop * 4); } int variableTableLength = 0; if (itsVarDescriptors != null) { // 6 bytes for the attribute header // 2 bytes for the variable count // 10 bytes for each entry variableTableLength = 6 + 2 + (itsVarDescriptors.size() * 10); } int attrLength = 2 + // attribute_name_index 4 + // attribute_length 2 + // max_stack 2 + // max_locals 4 + // code_length itsCodeBufferTop + 2 + // exception_table_length (itsExceptionTableTop * 8) + 2 + // attributes_count lineNumberTableLength + variableTableLength; if (attrLength > 65536) { // See http://java.sun.com/docs/books/jvms/second_edition/html/ClassFile.doc.html, // section 4.10, "The amount of code per non-native, non-abstract // method is limited to 65536 bytes... throw new ClassFileFormatException( "generated bytecode for method exceeds 64K limit."); } byte[] codeAttribute = new byte[attrLength]; int index = 0; int codeAttrIndex = itsConstantPool.addUtf8("Code"); index = putInt16(codeAttrIndex, codeAttribute, index); attrLength -= 6; // discount the attribute header index = putInt32(attrLength, codeAttribute, index); index = putInt16(itsMaxStack, codeAttribute, index); index = putInt16(itsMaxLocals, codeAttribute, index); index = putInt32(itsCodeBufferTop, codeAttribute, index); System.arraycopy(itsCodeBuffer, 0, codeAttribute, index, itsCodeBufferTop); index += itsCodeBufferTop; if (itsExceptionTableTop > 0) { index = putInt16(itsExceptionTableTop, codeAttribute, index); for (int i = 0; i < itsExceptionTableTop; i++) { ExceptionTableEntry ete = itsExceptionTable[i]; short startPC = (short)getLabelPC(ete.itsStartLabel); short endPC = (short)getLabelPC(ete.itsEndLabel); short handlerPC = (short)getLabelPC(ete.itsHandlerLabel); short catchType = ete.itsCatchType; if (startPC == -1) throw new IllegalStateException("start label not defined"); if (endPC == -1) throw new IllegalStateException("end label not defined"); if (handlerPC == -1) throw new IllegalStateException( "handler label not defined"); index = putInt16(startPC, codeAttribute, index); index = putInt16(endPC, codeAttribute, index); index = putInt16(handlerPC, codeAttribute, index); index = putInt16(catchType, codeAttribute, index); } } else { // write 0 as exception table length index = putInt16(0, codeAttribute, index); } int attributeCount = 0; if (itsLineNumberTable != null) attributeCount++; if (itsVarDescriptors != null) attributeCount++; index = putInt16(attributeCount, codeAttribute, index); if (itsLineNumberTable != null) { int lineNumberTableAttrIndex = itsConstantPool.addUtf8("LineNumberTable"); index = putInt16(lineNumberTableAttrIndex, codeAttribute, index); int tableAttrLength = 2 + (itsLineNumberTableTop * 4); index = putInt32(tableAttrLength, codeAttribute, index); index = putInt16(itsLineNumberTableTop, codeAttribute, index); for (int i = 0; i < itsLineNumberTableTop; i++) { index = putInt32(itsLineNumberTable[i], codeAttribute, index); } } if (itsVarDescriptors != null) { int variableTableAttrIndex = itsConstantPool.addUtf8("LocalVariableTable"); index = putInt16(variableTableAttrIndex, codeAttribute, index); int varCount = itsVarDescriptors.size(); int tableAttrLength = 2 + (varCount * 10); index = putInt32(tableAttrLength, codeAttribute, index); index = putInt16(varCount, codeAttribute, index); for (int i = 0; i < varCount; i++) { int[] chunk = (int[])itsVarDescriptors.get(i); int nameIndex = chunk[0]; int descriptorIndex = chunk[1]; int startPC = chunk[2]; int register = chunk[3]; int length = itsCodeBufferTop - startPC; index = putInt16(startPC, codeAttribute, index); index = putInt16(length, codeAttribute, index); index = putInt16(nameIndex, codeAttribute, index); index = putInt16(descriptorIndex, codeAttribute, index); index = putInt16(register, codeAttribute, index); } } itsCurrentMethod.setCodeAttribute(codeAttribute); itsExceptionTable = null; itsExceptionTableTop = 0; itsLineNumberTableTop = 0; itsCodeBufferTop = 0; itsCurrentMethod = null; itsMaxStack = 0; itsStackTop = 0; itsLabelTableTop = 0; itsFixupTableTop = 0; itsVarDescriptors = null; } /** * Add the single-byte opcode to the current method. * * @param theOpCode the opcode of the bytecode */ public void add(int theOpCode) { if (opcodeCount(theOpCode) != 0) throw new IllegalArgumentException("Unexpected operands"); int newStack = itsStackTop + stackChange(theOpCode); if (newStack < 0 || Short.MAX_VALUE < newStack) badStack(newStack); if (DEBUGCODE) System.out.println("Add " + bytecodeStr(theOpCode)); addToCodeBuffer(theOpCode); itsStackTop = (short)newStack; if (newStack > itsMaxStack) itsMaxStack = (short)newStack; if (DEBUGSTACK) { System.out.println("After "+bytecodeStr(theOpCode) +" stack = "+itsStackTop); } } /** * Add a single-operand opcode to the current method. * * @param theOpCode the opcode of the bytecode * @param theOperand the operand of the bytecode */ public void add(int theOpCode, int theOperand) { if (DEBUGCODE) { System.out.println("Add "+bytecodeStr(theOpCode) +", "+Integer.toHexString(theOperand)); } int newStack = itsStackTop + stackChange(theOpCode); if (newStack < 0 || Short.MAX_VALUE < newStack) badStack(newStack); switch (theOpCode) { case ByteCode.GOTO : // fallthru... case ByteCode.IFEQ : case ByteCode.IFNE : case ByteCode.IFLT : case ByteCode.IFGE : case ByteCode.IFGT : case ByteCode.IFLE : case ByteCode.IF_ICMPEQ : case ByteCode.IF_ICMPNE : case ByteCode.IF_ICMPLT : case ByteCode.IF_ICMPGE : case ByteCode.IF_ICMPGT : case ByteCode.IF_ICMPLE : case ByteCode.IF_ACMPEQ : case ByteCode.IF_ACMPNE : case ByteCode.JSR : case ByteCode.IFNULL : case ByteCode.IFNONNULL : { if ((theOperand & 0x80000000) != 0x80000000) { if ((theOperand < 0) || (theOperand > 65535)) throw new IllegalArgumentException( "Bad label for branch"); } int branchPC = itsCodeBufferTop; addToCodeBuffer(theOpCode); if ((theOperand & 0x80000000) != 0x80000000) { // hard displacement addToCodeInt16(theOperand); } else { // a label int targetPC = getLabelPC(theOperand); if (DEBUGLABELS) { int theLabel = theOperand & 0x7FFFFFFF; System.out.println("Fixing branch to " + theLabel + " at " + targetPC + " from " + branchPC); } if (targetPC != -1) { int offset = targetPC - branchPC; addToCodeInt16(offset); } else { addLabelFixup(theOperand, branchPC + 1); addToCodeInt16(0); } } } break; case ByteCode.BIPUSH : if ((byte)theOperand != theOperand) throw new IllegalArgumentException("out of range byte"); addToCodeBuffer(theOpCode); addToCodeBuffer((byte)theOperand); break; case ByteCode.SIPUSH : if ((short)theOperand != theOperand) throw new IllegalArgumentException("out of range short"); addToCodeBuffer(theOpCode); addToCodeInt16(theOperand); break; case ByteCode.NEWARRAY : if (!(0 <= theOperand && theOperand < 256)) throw new IllegalArgumentException("out of range index"); addToCodeBuffer(theOpCode); addToCodeBuffer(theOperand); break; case ByteCode.GETFIELD : case ByteCode.PUTFIELD : if (!(0 <= theOperand && theOperand < 65536)) throw new IllegalArgumentException("out of range field"); addToCodeBuffer(theOpCode); addToCodeInt16(theOperand); break; case ByteCode.LDC : case ByteCode.LDC_W : case ByteCode.LDC2_W : if (!(0 <= theOperand && theOperand < 65536)) throw new IllegalArgumentException("out of range index"); if (theOperand >= 256 || theOpCode == ByteCode.LDC_W || theOpCode == ByteCode.LDC2_W) { if (theOpCode == ByteCode.LDC) { addToCodeBuffer(ByteCode.LDC_W); } else { addToCodeBuffer(theOpCode); } addToCodeInt16(theOperand); } else { addToCodeBuffer(theOpCode); addToCodeBuffer(theOperand); } break; case ByteCode.RET : case ByteCode.ILOAD : case ByteCode.LLOAD : case ByteCode.FLOAD : case ByteCode.DLOAD : case ByteCode.ALOAD : case ByteCode.ISTORE : case ByteCode.LSTORE : case ByteCode.FSTORE : case ByteCode.DSTORE : case ByteCode.ASTORE : if (!(0 <= theOperand && theOperand < 65536)) throw new ClassFileFormatException("out of range variable"); if (theOperand >= 256) { addToCodeBuffer(ByteCode.WIDE); addToCodeBuffer(theOpCode); addToCodeInt16(theOperand); } else { addToCodeBuffer(theOpCode); addToCodeBuffer(theOperand); } break; default : throw new IllegalArgumentException( "Unexpected opcode for 1 operand"); } itsStackTop = (short)newStack; if (newStack > itsMaxStack) itsMaxStack = (short)newStack; if (DEBUGSTACK) { System.out.println("After "+bytecodeStr(theOpCode) +" stack = "+itsStackTop); } } /** * Generate the load constant bytecode for the given integer. * * @param k the constant */ public void addLoadConstant(int k) { switch (k) { case 0: add(ByteCode.ICONST_0); break; case 1: add(ByteCode.ICONST_1); break; case 2: add(ByteCode.ICONST_2); break; case 3: add(ByteCode.ICONST_3); break; case 4: add(ByteCode.ICONST_4); break; case 5: add(ByteCode.ICONST_5); break; default: add(ByteCode.LDC, itsConstantPool.addConstant(k)); break; } } /** * Generate the load constant bytecode for the given long. * * @param k the constant */ public void addLoadConstant(long k) { add(ByteCode.LDC2_W, itsConstantPool.addConstant(k)); } /** * Generate the load constant bytecode for the given float. * * @param k the constant */ public void addLoadConstant(float k) { add(ByteCode.LDC, itsConstantPool.addConstant(k)); } /** * Generate the load constant bytecode for the given double. * * @param k the constant */ public void addLoadConstant(double k) { add(ByteCode.LDC2_W, itsConstantPool.addConstant(k)); } /** * Generate the load constant bytecode for the given string. * * @param k the constant */ public void addLoadConstant(String k) { add(ByteCode.LDC, itsConstantPool.addConstant(k)); } /** * Add the given two-operand bytecode to the current method. * * @param theOpCode the opcode of the bytecode * @param theOperand1 the first operand of the bytecode * @param theOperand2 the second operand of the bytecode */ public void add(int theOpCode, int theOperand1, int theOperand2) { if (DEBUGCODE) { System.out.println("Add "+bytecodeStr(theOpCode) +", "+Integer.toHexString(theOperand1) +", "+Integer.toHexString(theOperand2)); } int newStack = itsStackTop + stackChange(theOpCode); if (newStack < 0 || Short.MAX_VALUE < newStack) badStack(newStack); if (theOpCode == ByteCode.IINC) { if (!(0 <= theOperand1 && theOperand1 < 65536)) throw new ClassFileFormatException("out of range variable"); if (!(0 <= theOperand2 && theOperand2 < 65536)) throw new ClassFileFormatException("out of range increment"); if (theOperand1 > 255 || theOperand2 < -128 || theOperand2 > 127) { addToCodeBuffer(ByteCode.WIDE); addToCodeBuffer(ByteCode.IINC); addToCodeInt16(theOperand1); addToCodeInt16(theOperand2); } else { addToCodeBuffer(ByteCode.WIDE); addToCodeBuffer(ByteCode.IINC); addToCodeBuffer(theOperand1); addToCodeBuffer(theOperand2); } } else if (theOpCode == ByteCode.MULTIANEWARRAY) { if (!(0 <= theOperand1 && theOperand1 < 65536)) throw new IllegalArgumentException("out of range index"); if (!(0 <= theOperand2 && theOperand2 < 256)) throw new IllegalArgumentException("out of range dimensions"); addToCodeBuffer(ByteCode.MULTIANEWARRAY); addToCodeInt16(theOperand1); addToCodeBuffer(theOperand2); } else { throw new IllegalArgumentException( "Unexpected opcode for 2 operands"); } itsStackTop = (short)newStack; if (newStack > itsMaxStack) itsMaxStack = (short)newStack; if (DEBUGSTACK) { System.out.println("After "+bytecodeStr(theOpCode) +" stack = "+itsStackTop); } } public void add(int theOpCode, String className) { if (DEBUGCODE) { System.out.println("Add "+bytecodeStr(theOpCode) +", "+className); } int newStack = itsStackTop + stackChange(theOpCode); if (newStack < 0 || Short.MAX_VALUE < newStack) badStack(newStack); switch (theOpCode) { case ByteCode.NEW : case ByteCode.ANEWARRAY : case ByteCode.CHECKCAST : case ByteCode.INSTANCEOF : { short classIndex = itsConstantPool.addClass(className); addToCodeBuffer(theOpCode); addToCodeInt16(classIndex); } break; default : throw new IllegalArgumentException( "bad opcode for class reference"); } itsStackTop = (short)newStack; if (newStack > itsMaxStack) itsMaxStack = (short)newStack; if (DEBUGSTACK) { System.out.println("After "+bytecodeStr(theOpCode) +" stack = "+itsStackTop); } } public void add(int theOpCode, String className, String fieldName, String fieldType) { if (DEBUGCODE) { System.out.println("Add "+bytecodeStr(theOpCode) +", "+className+", "+fieldName+", "+fieldType); } int newStack = itsStackTop + stackChange(theOpCode); char fieldTypeChar = fieldType.charAt(0); int fieldSize = (fieldTypeChar == 'J' || fieldTypeChar == 'D') ? 2 : 1; switch (theOpCode) { case ByteCode.GETFIELD : case ByteCode.GETSTATIC : newStack += fieldSize; break; case ByteCode.PUTSTATIC : case ByteCode.PUTFIELD : newStack -= fieldSize; break; default : throw new IllegalArgumentException( "bad opcode for field reference"); } if (newStack < 0 || Short.MAX_VALUE < newStack) badStack(newStack); short fieldRefIndex = itsConstantPool.addFieldRef(className, fieldName, fieldType); addToCodeBuffer(theOpCode); addToCodeInt16(fieldRefIndex); itsStackTop = (short)newStack; if (newStack > itsMaxStack) itsMaxStack = (short)newStack; if (DEBUGSTACK) { System.out.println("After "+bytecodeStr(theOpCode) +" stack = "+itsStackTop); } } public void addInvoke(int theOpCode, String className, String methodName, String methodType) { if (DEBUGCODE) { System.out.println("Add "+bytecodeStr(theOpCode) +", "+className+", "+methodName+", " +methodType); } int parameterInfo = sizeOfParameters(methodType); int parameterCount = parameterInfo >>> 16; int stackDiff = (short)parameterInfo; int newStack = itsStackTop + stackDiff; newStack += stackChange(theOpCode); // adjusts for 'this' if (newStack < 0 || Short.MAX_VALUE < newStack) badStack(newStack); switch (theOpCode) { case ByteCode.INVOKEVIRTUAL : case ByteCode.INVOKESPECIAL : case ByteCode.INVOKESTATIC : case ByteCode.INVOKEINTERFACE : { addToCodeBuffer(theOpCode); if (theOpCode == ByteCode.INVOKEINTERFACE) { short ifMethodRefIndex = itsConstantPool.addInterfaceMethodRef( className, methodName, methodType); addToCodeInt16(ifMethodRefIndex); addToCodeBuffer(parameterCount + 1); addToCodeBuffer(0); } else { short methodRefIndex = itsConstantPool.addMethodRef( className, methodName, methodType); addToCodeInt16(methodRefIndex); } } break; default : throw new IllegalArgumentException( "bad opcode for method reference"); } itsStackTop = (short)newStack; if (newStack > itsMaxStack) itsMaxStack = (short)newStack; if (DEBUGSTACK) { System.out.println("After "+bytecodeStr(theOpCode) +" stack = "+itsStackTop); } } /** * Generate code to load the given integer on stack. * * @param k the constant */ public void addPush(int k) { if ((byte)k == k) { if (k == -1) { add(ByteCode.ICONST_M1); } else if (0 <= k && k <= 5) { add((byte)(ByteCode.ICONST_0 + k)); } else { add(ByteCode.BIPUSH, (byte)k); } } else if ((short)k == k) { add(ByteCode.SIPUSH, (short)k); } else { addLoadConstant(k); } } public void addPush(boolean k) { add(k ? ByteCode.ICONST_1 : ByteCode.ICONST_0); } /** * Generate code to load the given long on stack. * * @param k the constant */ public void addPush(long k) { int ik = (int)k; if (ik == k) { addPush(ik); add(ByteCode.I2L); } else { addLoadConstant(k); } } /** * Generate code to load the given double on stack. * * @param k the constant */ public void addPush(double k) { if (k == 0.0) { // zero add(ByteCode.DCONST_0); if (1.0 / k < 0) { // Negative zero add(ByteCode.DNEG); } } else if (k == 1.0 || k == -1.0) { add(ByteCode.DCONST_1); if (k < 0) { add(ByteCode.DNEG); } } else { addLoadConstant(k); } } /** * Generate the code to leave on stack the given string even if the * string encoding exeeds the class file limit for single string constant * * @param k the constant */ public void addPush(String k) { int length = k.length(); int limit = itsConstantPool.getUtfEncodingLimit(k, 0, length); if (limit == length) { addLoadConstant(k); return; } // Split string into picies fitting the UTF limit and generate code for // StringBuffer sb = new StringBuffer(length); // sb.append(loadConstant(piece_1)); // ... // sb.append(loadConstant(piece_N)); // sb.toString(); final String SB = "java/lang/StringBuffer"; add(ByteCode.NEW, SB); add(ByteCode.DUP); addPush(length); addInvoke(ByteCode.INVOKESPECIAL, SB, "", "(I)V"); int cursor = 0; for (;;) { add(ByteCode.DUP); String s = k.substring(cursor, limit); addLoadConstant(s); addInvoke(ByteCode.INVOKEVIRTUAL, SB, "append", "(Ljava/lang/String;)Ljava/lang/StringBuffer;"); add(ByteCode.POP); if (limit == length) { break; } cursor = limit; limit = itsConstantPool.getUtfEncodingLimit(k, limit, length); } addInvoke(ByteCode.INVOKEVIRTUAL, SB, "toString", "()Ljava/lang/String;"); } /** * Check if k fits limit on string constant size imposed by class file * format. * * @param k the string constant */ public boolean isUnderStringSizeLimit(String k) { return itsConstantPool.isUnderUtfEncodingLimit(k); } /** * Store integer from stack top into the given local. * * @param local number of local register */ public void addIStore(int local) { xop(ByteCode.ISTORE_0, ByteCode.ISTORE, local); } /** * Store long from stack top into the given local. * * @param local number of local register */ public void addLStore(int local) { xop(ByteCode.LSTORE_0, ByteCode.LSTORE, local); } /** * Store float from stack top into the given local. * * @param local number of local register */ public void addFStore(int local) { xop(ByteCode.FSTORE_0, ByteCode.FSTORE, local); } /** * Store double from stack top into the given local. * * @param local number of local register */ public void addDStore(int local) { xop(ByteCode.DSTORE_0, ByteCode.DSTORE, local); } /** * Store object from stack top into the given local. * * @param local number of local register */ public void addAStore(int local) { xop(ByteCode.ASTORE_0, ByteCode.ASTORE, local); } /** * Load integer from the given local into stack. * * @param local number of local register */ public void addILoad(int local) { xop(ByteCode.ILOAD_0, ByteCode.ILOAD, local); } /** * Load long from the given local into stack. * * @param local number of local register */ public void addLLoad(int local) { xop(ByteCode.LLOAD_0, ByteCode.LLOAD, local); } /** * Load float from the given local into stack. * * @param local number of local register */ public void addFLoad(int local) { xop(ByteCode.FLOAD_0, ByteCode.FLOAD, local); } /** * Load double from the given local into stack. * * @param local number of local register */ public void addDLoad(int local) { xop(ByteCode.DLOAD_0, ByteCode.DLOAD, local); } /** * Load object from the given local into stack. * * @param local number of local register */ public void addALoad(int local) { xop(ByteCode.ALOAD_0, ByteCode.ALOAD, local); } /** * Load "this" into stack. */ public void addLoadThis() { add(ByteCode.ALOAD_0); } private void xop(int shortOp, int op, int local) { switch (local) { case 0: add(shortOp); break; case 1: add(shortOp + 1); break; case 2: add(shortOp + 2); break; case 3: add(shortOp + 3); break; default: add(op, local); } } public int addTableSwitch(int low, int high) { if (DEBUGCODE) { System.out.println("Add "+bytecodeStr(ByteCode.TABLESWITCH) +" "+low+" "+high); } if (low > high) throw new ClassFileFormatException("Bad bounds: "+low+' '+ high); int newStack = itsStackTop + stackChange(ByteCode.TABLESWITCH); if (newStack < 0 || Short.MAX_VALUE < newStack) badStack(newStack); int entryCount = high - low + 1; int padSize = 3 & ~itsCodeBufferTop; // == 3 - itsCodeBufferTop % 4 int N = addReservedCodeSpace(1 + padSize + 4 * (1 + 2 + entryCount)); int switchStart = N; itsCodeBuffer[N++] = (byte)ByteCode.TABLESWITCH; while (padSize != 0) { itsCodeBuffer[N++] = 0; --padSize; } N += 4; // skip default offset N = putInt32(low, itsCodeBuffer, N); putInt32(high, itsCodeBuffer, N); itsStackTop = (short)newStack; if (newStack > itsMaxStack) itsMaxStack = (short)newStack; if (DEBUGSTACK) { System.out.println("After "+bytecodeStr(ByteCode.TABLESWITCH) +" stack = "+itsStackTop); } return switchStart; } public final void markTableSwitchDefault(int switchStart) { setTableSwitchJump(switchStart, -1, itsCodeBufferTop); } public final void markTableSwitchCase(int switchStart, int caseIndex) { setTableSwitchJump(switchStart, caseIndex, itsCodeBufferTop); } public final void markTableSwitchCase(int switchStart, int caseIndex, int stackTop) { if (!(0 <= stackTop && stackTop <= itsMaxStack)) throw new IllegalArgumentException("Bad stack index: "+stackTop); itsStackTop = (short)stackTop; setTableSwitchJump(switchStart, caseIndex, itsCodeBufferTop); } public void setTableSwitchJump(int switchStart, int caseIndex, int jumpTarget) { if (!(0 <= jumpTarget && jumpTarget <= itsCodeBufferTop)) throw new IllegalArgumentException("Bad jump target: "+jumpTarget); if (!(caseIndex >= -1)) throw new IllegalArgumentException("Bad case index: "+caseIndex); int padSize = 3 & ~switchStart; // == 3 - switchStart % 4 int caseOffset; if (caseIndex < 0) { // default label caseOffset = switchStart + 1 + padSize; } else { caseOffset = switchStart + 1 + padSize + 4 * (3 + caseIndex); } if (!(0 <= switchStart && switchStart <= itsCodeBufferTop - 4 * 4 - padSize - 1)) { throw new IllegalArgumentException( switchStart+" is outside a possible range of tableswitch" +" in already generated code"); } if ((0xFF & itsCodeBuffer[switchStart]) != ByteCode.TABLESWITCH) { throw new IllegalArgumentException( switchStart+" is not offset of tableswitch statement"); } if (!(0 <= caseOffset && caseOffset + 4 <= itsCodeBufferTop)) { // caseIndex >= -1 does not guarantee that caseOffset >= 0 due // to a possible overflow. throw new ClassFileFormatException( "Too big case index: "+caseIndex); } // ALERT: perhaps check against case bounds? putInt32(jumpTarget - switchStart, itsCodeBuffer, caseOffset); } public int acquireLabel() { int top = itsLabelTableTop; if (itsLabelTable == null || top == itsLabelTable.length) { if (itsLabelTable == null) { itsLabelTable = new int[MIN_LABEL_TABLE_SIZE]; }else { int[] tmp = new int[itsLabelTable.length * 2]; System.arraycopy(itsLabelTable, 0, tmp, 0, top); itsLabelTable = tmp; } } itsLabelTableTop = top + 1; itsLabelTable[top] = -1; return top | 0x80000000; } public void markLabel(int label) { if (!(label < 0)) throw new IllegalArgumentException("Bad label, no biscuit"); label &= 0x7FFFFFFF; if (label > itsLabelTableTop) throw new IllegalArgumentException("Bad label"); if (itsLabelTable[label] != -1) { throw new IllegalStateException("Can only mark label once"); } itsLabelTable[label] = itsCodeBufferTop; } public void markLabel(int label, short stackTop) { markLabel(label); itsStackTop = stackTop; } public void markHandler(int theLabel) { itsStackTop = 1; markLabel(theLabel); } private int getLabelPC(int label) { if (!(label < 0)) throw new IllegalArgumentException("Bad label, no biscuit"); label &= 0x7FFFFFFF; if (!(label < itsLabelTableTop)) throw new IllegalArgumentException("Bad label"); return itsLabelTable[label]; } private void addLabelFixup(int label, int fixupSite) { if (!(label < 0)) throw new IllegalArgumentException("Bad label, no biscuit"); label &= 0x7FFFFFFF; if (!(label < itsLabelTableTop)) throw new IllegalArgumentException("Bad label"); int top = itsFixupTableTop; if (itsFixupTable == null || top == itsFixupTable.length) { if (itsFixupTable == null) { itsFixupTable = new long[MIN_FIXUP_TABLE_SIZE]; }else { long[] tmp = new long[itsFixupTable.length * 2]; System.arraycopy(itsFixupTable, 0, tmp, 0, top); itsFixupTable = tmp; } } itsFixupTableTop = top + 1; itsFixupTable[top] = ((long)label << 32) | fixupSite; } private void fixLabelGotos() { byte[] codeBuffer = itsCodeBuffer; for (int i = 0; i < itsFixupTableTop; i++) { long fixup = itsFixupTable[i]; int label = (int)(fixup >> 32); int fixupSite = (int)fixup; int pc = itsLabelTable[label]; if (pc == -1) { // Unlocated label throw new RuntimeException(); } // -1 to get delta from instruction start int offset = pc - (fixupSite - 1); if ((short)offset != offset) { throw new ClassFileFormatException ("Program too complex: too big jump offset"); } codeBuffer[fixupSite] = (byte)(offset >> 8); codeBuffer[fixupSite + 1] = (byte)offset; } itsFixupTableTop = 0; } /** * Get the current offset into the code of the current method. * * @return an integer representing the offset */ public int getCurrentCodeOffset() { return itsCodeBufferTop; } public short getStackTop() { return itsStackTop; } public void setStackTop(short n) { itsStackTop = n; } public void adjustStackTop(int delta) { int newStack = itsStackTop + delta; if (newStack < 0 || Short.MAX_VALUE < newStack) badStack(newStack); itsStackTop = (short)newStack; if (newStack > itsMaxStack) itsMaxStack = (short)newStack; if (DEBUGSTACK) { System.out.println("After "+"adjustStackTop("+delta+")" +" stack = "+itsStackTop); } } private void addToCodeBuffer(int b) { int N = addReservedCodeSpace(1); itsCodeBuffer[N] = (byte)b; } private void addToCodeInt16(int value) { int N = addReservedCodeSpace(2); putInt16(value, itsCodeBuffer, N); } private int addReservedCodeSpace(int size) { if (itsCurrentMethod == null) throw new IllegalArgumentException("No method to add to"); int oldTop = itsCodeBufferTop; int newTop = oldTop + size; if (newTop > itsCodeBuffer.length) { int newSize = itsCodeBuffer.length * 2; if (newTop > newSize) { newSize = newTop; } byte[] tmp = new byte[newSize]; System.arraycopy(itsCodeBuffer, 0, tmp, 0, oldTop); itsCodeBuffer = tmp; } itsCodeBufferTop = newTop; return oldTop; } public void addExceptionHandler(int startLabel, int endLabel, int handlerLabel, String catchClassName) { if ((startLabel & 0x80000000) != 0x80000000) throw new IllegalArgumentException("Bad startLabel"); if ((endLabel & 0x80000000) != 0x80000000) throw new IllegalArgumentException("Bad endLabel"); if ((handlerLabel & 0x80000000) != 0x80000000) throw new IllegalArgumentException("Bad handlerLabel"); /* * If catchClassName is null, use 0 for the catch_type_index; which * means catch everything. (Even when the verifier has let you throw * something other than a Throwable.) */ short catch_type_index = (catchClassName == null) ? 0 : itsConstantPool.addClass(catchClassName); ExceptionTableEntry newEntry = new ExceptionTableEntry( startLabel, endLabel, handlerLabel, catch_type_index); int N = itsExceptionTableTop; if (N == 0) { itsExceptionTable = new ExceptionTableEntry[ExceptionTableSize]; } else if (N == itsExceptionTable.length) { ExceptionTableEntry[] tmp = new ExceptionTableEntry[N * 2]; System.arraycopy(itsExceptionTable, 0, tmp, 0, N); itsExceptionTable = tmp; } itsExceptionTable[N] = newEntry; itsExceptionTableTop = N + 1; } public void addLineNumberEntry(short lineNumber) { if (itsCurrentMethod == null) throw new IllegalArgumentException("No method to stop"); int N = itsLineNumberTableTop; if (N == 0) { itsLineNumberTable = new int[LineNumberTableSize]; } else if (N == itsLineNumberTable.length) { int[] tmp = new int[N * 2]; System.arraycopy(itsLineNumberTable, 0, tmp, 0, N); itsLineNumberTable = tmp; } itsLineNumberTable[N] = (itsCodeBufferTop << 16) + lineNumber; itsLineNumberTableTop = N + 1; } /** * Write the class file to the OutputStream. * * @param oStream the stream to write to * @throws IOException if writing to the stream produces an exception */ public void write(OutputStream oStream) throws IOException { byte[] array = toByteArray(); oStream.write(array); } private int getWriteSize() { int size = 0; if (itsSourceFileNameIndex != 0) { itsConstantPool.addUtf8("SourceFile"); } size += 8; //writeLong(FileHeaderConstant); size += itsConstantPool.getWriteSize(); size += 2; //writeShort(itsFlags); size += 2; //writeShort(itsThisClassIndex); size += 2; //writeShort(itsSuperClassIndex); size += 2; //writeShort(itsInterfaces.size()); size += 2 * itsInterfaces.size(); size += 2; //writeShort(itsFields.size()); for (int i = 0; i < itsFields.size(); i++) { size += ((ClassFileField)(itsFields.get(i))).getWriteSize(); } size += 2; //writeShort(itsMethods.size()); for (int i = 0; i < itsMethods.size(); i++) { size += ((ClassFileMethod)(itsMethods.get(i))).getWriteSize(); } if (itsSourceFileNameIndex != 0) { size += 2; //writeShort(1); attributes count size += 2; //writeShort(sourceFileAttributeNameIndex); size += 4; //writeInt(2); size += 2; //writeShort(itsSourceFileNameIndex); }else { size += 2; //out.writeShort(0); no attributes } return size; } /** * Get the class file as array of bytesto the OutputStream. */ public byte[] toByteArray() { int dataSize = getWriteSize(); byte[] data = new byte[dataSize]; int offset = 0; short sourceFileAttributeNameIndex = 0; if (itsSourceFileNameIndex != 0) { sourceFileAttributeNameIndex = itsConstantPool.addUtf8( "SourceFile"); } offset = putInt64(FileHeaderConstant, data, offset); offset = itsConstantPool.write(data, offset); offset = putInt16(itsFlags, data, offset); offset = putInt16(itsThisClassIndex, data, offset); offset = putInt16(itsSuperClassIndex, data, offset); offset = putInt16(itsInterfaces.size(), data, offset); for (int i = 0; i < itsInterfaces.size(); i++) { int interfaceIndex = ((Short)(itsInterfaces.get(i))).shortValue(); offset = putInt16(interfaceIndex, data, offset); } offset = putInt16(itsFields.size(), data, offset); for (int i = 0; i < itsFields.size(); i++) { ClassFileField field = (ClassFileField)itsFields.get(i); offset = field.write(data, offset); } offset = putInt16(itsMethods.size(), data, offset); for (int i = 0; i < itsMethods.size(); i++) { ClassFileMethod method = (ClassFileMethod)itsMethods.get(i); offset = method.write(data, offset); } if (itsSourceFileNameIndex != 0) { offset = putInt16(1, data, offset); // attributes count offset = putInt16(sourceFileAttributeNameIndex, data, offset); offset = putInt32(2, data, offset); offset = putInt16(itsSourceFileNameIndex, data, offset); } else { offset = putInt16(0, data, offset); // no attributes } if (offset != dataSize) { // Check getWriteSize is consistent with write! throw new RuntimeException(); } return data; } static int putInt64(long value, byte[] array, int offset) { offset = putInt32((int)(value >>> 32), array, offset); return putInt32((int)value, array, offset); } private static void badStack(int value) { String s; if (value < 0) { s = "Stack underflow: "+value; } else { s = "Too big stack: "+value; } throw new IllegalStateException(s); } /* Really weird. Returns an int with # parameters in hi 16 bits, and stack difference removal of parameters from stack and pushing the result (it does not take into account removal of this in case of non-static methods). If Java really supported references we wouldn't have to be this perverted. */ private static int sizeOfParameters(String pString) { int length = pString.length(); int rightParenthesis = pString.lastIndexOf(')'); if (3 <= length /* minimal signature takes at least 3 chars: ()V */ && pString.charAt(0) == '(' && 1 <= rightParenthesis && rightParenthesis + 1 < length) { boolean ok = true; int index = 1; int stackDiff = 0; int count = 0; stringLoop: while (index != rightParenthesis) { switch (pString.charAt(index)) { default: ok = false; break stringLoop; case 'J' : case 'D' : --stackDiff; // fall thru case 'B' : case 'S' : case 'C' : case 'I' : case 'Z' : case 'F' : --stackDiff; ++count; ++index; continue; case '[' : ++index; int c = pString.charAt(index); while (c == '[') { ++index; c = pString.charAt(index); } switch (c) { default: ok = false; break stringLoop; case 'J' : case 'D' : case 'B' : case 'S' : case 'C' : case 'I' : case 'Z' : case 'F' : --stackDiff; ++count; ++index; continue; case 'L': // fall thru } // fall thru case 'L' : { --stackDiff; ++count; ++index; int semicolon = pString.indexOf(';', index); if (!(index + 1 <= semicolon && semicolon < rightParenthesis)) { ok = false; break stringLoop; } index = semicolon + 1; continue; } } } if (ok) { switch (pString.charAt(rightParenthesis + 1)) { default: ok = false; break; case 'J' : case 'D' : ++stackDiff; // fall thru case 'B' : case 'S' : case 'C' : case 'I' : case 'Z' : case 'F' : case 'L' : case '[' : ++stackDiff; // fall thru case 'V' : break; } if (ok) { return ((count << 16) | (0xFFFF & stackDiff)); } } } throw new IllegalArgumentException( "Bad parameter signature: "+pString); } static int putInt16(int value, byte[] array, int offset) { array[offset + 0] = (byte)(value >>> 8); array[offset + 1] = (byte)value; return offset + 2; } static int putInt32(int value, byte[] array, int offset) { array[offset + 0] = (byte)(value >>> 24); array[offset + 1] = (byte)(value >>> 16); array[offset + 2] = (byte)(value >>> 8); array[offset + 3] = (byte)value; return offset + 4; } /** * Number of operands accompanying the opcode. */ static int opcodeCount(int opcode) { switch (opcode) { case ByteCode.AALOAD: case ByteCode.AASTORE: case ByteCode.ACONST_NULL: case ByteCode.ALOAD_0: case ByteCode.ALOAD_1: case ByteCode.ALOAD_2: case ByteCode.ALOAD_3: case ByteCode.ARETURN: case ByteCode.ARRAYLENGTH: case ByteCode.ASTORE_0: case ByteCode.ASTORE_1: case ByteCode.ASTORE_2: case ByteCode.ASTORE_3: case ByteCode.ATHROW: case ByteCode.BALOAD: case ByteCode.BASTORE: case ByteCode.BREAKPOINT: case ByteCode.CALOAD: case ByteCode.CASTORE: case ByteCode.D2F: case ByteCode.D2I: case ByteCode.D2L: case ByteCode.DADD: case ByteCode.DALOAD: case ByteCode.DASTORE: case ByteCode.DCMPG: case ByteCode.DCMPL: case ByteCode.DCONST_0: case ByteCode.DCONST_1: case ByteCode.DDIV: case ByteCode.DLOAD_0: case ByteCode.DLOAD_1: case ByteCode.DLOAD_2: case ByteCode.DLOAD_3: case ByteCode.DMUL: case ByteCode.DNEG: case ByteCode.DREM: case ByteCode.DRETURN: case ByteCode.DSTORE_0: case ByteCode.DSTORE_1: case ByteCode.DSTORE_2: case ByteCode.DSTORE_3: case ByteCode.DSUB: case ByteCode.DUP: case ByteCode.DUP2: case ByteCode.DUP2_X1: case ByteCode.DUP2_X2: case ByteCode.DUP_X1: case ByteCode.DUP_X2: case ByteCode.F2D: case ByteCode.F2I: case ByteCode.F2L: case ByteCode.FADD: case ByteCode.FALOAD: case ByteCode.FASTORE: case ByteCode.FCMPG: case ByteCode.FCMPL: case ByteCode.FCONST_0: case ByteCode.FCONST_1: case ByteCode.FCONST_2: case ByteCode.FDIV: case ByteCode.FLOAD_0: case ByteCode.FLOAD_1: case ByteCode.FLOAD_2: case ByteCode.FLOAD_3: case ByteCode.FMUL: case ByteCode.FNEG: case ByteCode.FREM: case ByteCode.FRETURN: case ByteCode.FSTORE_0: case ByteCode.FSTORE_1: case ByteCode.FSTORE_2: case ByteCode.FSTORE_3: case ByteCode.FSUB: case ByteCode.I2B: case ByteCode.I2C: case ByteCode.I2D: case ByteCode.I2F: case ByteCode.I2L: case ByteCode.I2S: case ByteCode.IADD: case ByteCode.IALOAD: case ByteCode.IAND: case ByteCode.IASTORE: case ByteCode.ICONST_0: case ByteCode.ICONST_1: case ByteCode.ICONST_2: case ByteCode.ICONST_3: case ByteCode.ICONST_4: case ByteCode.ICONST_5: case ByteCode.ICONST_M1: case ByteCode.IDIV: case ByteCode.ILOAD_0: case ByteCode.ILOAD_1: case ByteCode.ILOAD_2: case ByteCode.ILOAD_3: case ByteCode.IMPDEP1: case ByteCode.IMPDEP2: case ByteCode.IMUL: case ByteCode.INEG: case ByteCode.IOR: case ByteCode.IREM: case ByteCode.IRETURN: case ByteCode.ISHL: case ByteCode.ISHR: case ByteCode.ISTORE_0: case ByteCode.ISTORE_1: case ByteCode.ISTORE_2: case ByteCode.ISTORE_3: case ByteCode.ISUB: case ByteCode.IUSHR: case ByteCode.IXOR: case ByteCode.L2D: case ByteCode.L2F: case ByteCode.L2I: case ByteCode.LADD: case ByteCode.LALOAD: case ByteCode.LAND: case ByteCode.LASTORE: case ByteCode.LCMP: case ByteCode.LCONST_0: case ByteCode.LCONST_1: case ByteCode.LDIV: case ByteCode.LLOAD_0: case ByteCode.LLOAD_1: case ByteCode.LLOAD_2: case ByteCode.LLOAD_3: case ByteCode.LMUL: case ByteCode.LNEG: case ByteCode.LOR: case ByteCode.LREM: case ByteCode.LRETURN: case ByteCode.LSHL: case ByteCode.LSHR: case ByteCode.LSTORE_0: case ByteCode.LSTORE_1: case ByteCode.LSTORE_2: case ByteCode.LSTORE_3: case ByteCode.LSUB: case ByteCode.LUSHR: case ByteCode.LXOR: case ByteCode.MONITORENTER: case ByteCode.MONITOREXIT: case ByteCode.NOP: case ByteCode.POP: case ByteCode.POP2: case ByteCode.RETURN: case ByteCode.SALOAD: case ByteCode.SASTORE: case ByteCode.SWAP: case ByteCode.WIDE: return 0; case ByteCode.ALOAD: case ByteCode.ANEWARRAY: case ByteCode.ASTORE: case ByteCode.BIPUSH: case ByteCode.CHECKCAST: case ByteCode.DLOAD: case ByteCode.DSTORE: case ByteCode.FLOAD: case ByteCode.FSTORE: case ByteCode.GETFIELD: case ByteCode.GETSTATIC: case ByteCode.GOTO: case ByteCode.GOTO_W: case ByteCode.IFEQ: case ByteCode.IFGE: case ByteCode.IFGT: case ByteCode.IFLE: case ByteCode.IFLT: case ByteCode.IFNE: case ByteCode.IFNONNULL: case ByteCode.IFNULL: case ByteCode.IF_ACMPEQ: case ByteCode.IF_ACMPNE: case ByteCode.IF_ICMPEQ: case ByteCode.IF_ICMPGE: case ByteCode.IF_ICMPGT: case ByteCode.IF_ICMPLE: case ByteCode.IF_ICMPLT: case ByteCode.IF_ICMPNE: case ByteCode.ILOAD: case ByteCode.INSTANCEOF: case ByteCode.INVOKEINTERFACE: case ByteCode.INVOKESPECIAL: case ByteCode.INVOKESTATIC: case ByteCode.INVOKEVIRTUAL: case ByteCode.ISTORE: case ByteCode.JSR: case ByteCode.JSR_W: case ByteCode.LDC: case ByteCode.LDC2_W: case ByteCode.LDC_W: case ByteCode.LLOAD: case ByteCode.LSTORE: case ByteCode.NEW: case ByteCode.NEWARRAY: case ByteCode.PUTFIELD: case ByteCode.PUTSTATIC: case ByteCode.RET: case ByteCode.SIPUSH: return 1; case ByteCode.IINC: case ByteCode.MULTIANEWARRAY: return 2; case ByteCode.LOOKUPSWITCH: case ByteCode.TABLESWITCH: return -1; } throw new IllegalArgumentException("Bad opcode: "+opcode); } /** * The effect on the operand stack of a given opcode. */ static int stackChange(int opcode) { // For INVOKE... accounts only for popping this (unless static), // ignoring parameters and return type switch (opcode) { case ByteCode.DASTORE: case ByteCode.LASTORE: return -4; case ByteCode.AASTORE: case ByteCode.BASTORE: case ByteCode.CASTORE: case ByteCode.DCMPG: case ByteCode.DCMPL: case ByteCode.FASTORE: case ByteCode.IASTORE: case ByteCode.LCMP: case ByteCode.SASTORE: return -3; case ByteCode.DADD: case ByteCode.DDIV: case ByteCode.DMUL: case ByteCode.DREM: case ByteCode.DRETURN: case ByteCode.DSTORE: case ByteCode.DSTORE_0: case ByteCode.DSTORE_1: case ByteCode.DSTORE_2: case ByteCode.DSTORE_3: case ByteCode.DSUB: case ByteCode.IF_ACMPEQ: case ByteCode.IF_ACMPNE: case ByteCode.IF_ICMPEQ: case ByteCode.IF_ICMPGE: case ByteCode.IF_ICMPGT: case ByteCode.IF_ICMPLE: case ByteCode.IF_ICMPLT: case ByteCode.IF_ICMPNE: case ByteCode.LADD: case ByteCode.LAND: case ByteCode.LDIV: case ByteCode.LMUL: case ByteCode.LOR: case ByteCode.LREM: case ByteCode.LRETURN: case ByteCode.LSTORE: case ByteCode.LSTORE_0: case ByteCode.LSTORE_1: case ByteCode.LSTORE_2: case ByteCode.LSTORE_3: case ByteCode.LSUB: case ByteCode.LXOR: case ByteCode.POP2: return -2; case ByteCode.AALOAD: case ByteCode.ARETURN: case ByteCode.ASTORE: case ByteCode.ASTORE_0: case ByteCode.ASTORE_1: case ByteCode.ASTORE_2: case ByteCode.ASTORE_3: case ByteCode.ATHROW: case ByteCode.BALOAD: case ByteCode.CALOAD: case ByteCode.D2F: case ByteCode.D2I: case ByteCode.FADD: case ByteCode.FALOAD: case ByteCode.FCMPG: case ByteCode.FCMPL: case ByteCode.FDIV: case ByteCode.FMUL: case ByteCode.FREM: case ByteCode.FRETURN: case ByteCode.FSTORE: case ByteCode.FSTORE_0: case ByteCode.FSTORE_1: case ByteCode.FSTORE_2: case ByteCode.FSTORE_3: case ByteCode.FSUB: case ByteCode.GETFIELD: case ByteCode.IADD: case ByteCode.IALOAD: case ByteCode.IAND: case ByteCode.IDIV: case ByteCode.IFEQ: case ByteCode.IFGE: case ByteCode.IFGT: case ByteCode.IFLE: case ByteCode.IFLT: case ByteCode.IFNE: case ByteCode.IFNONNULL: case ByteCode.IFNULL: case ByteCode.IMUL: case ByteCode.INVOKEINTERFACE: // case ByteCode.INVOKESPECIAL: // but needs to account for case ByteCode.INVOKEVIRTUAL: // pops 'this' (unless static) case ByteCode.IOR: case ByteCode.IREM: case ByteCode.IRETURN: case ByteCode.ISHL: case ByteCode.ISHR: case ByteCode.ISTORE: case ByteCode.ISTORE_0: case ByteCode.ISTORE_1: case ByteCode.ISTORE_2: case ByteCode.ISTORE_3: case ByteCode.ISUB: case ByteCode.IUSHR: case ByteCode.IXOR: case ByteCode.L2F: case ByteCode.L2I: case ByteCode.LOOKUPSWITCH: case ByteCode.LSHL: case ByteCode.LSHR: case ByteCode.LUSHR: case ByteCode.MONITORENTER: case ByteCode.MONITOREXIT: case ByteCode.POP: case ByteCode.PUTFIELD: case ByteCode.SALOAD: case ByteCode.TABLESWITCH: return -1; case ByteCode.ANEWARRAY: case ByteCode.ARRAYLENGTH: case ByteCode.BREAKPOINT: case ByteCode.CHECKCAST: case ByteCode.D2L: case ByteCode.DALOAD: case ByteCode.DNEG: case ByteCode.F2I: case ByteCode.FNEG: case ByteCode.GETSTATIC: case ByteCode.GOTO: case ByteCode.GOTO_W: case ByteCode.I2B: case ByteCode.I2C: case ByteCode.I2F: case ByteCode.I2S: case ByteCode.IINC: case ByteCode.IMPDEP1: case ByteCode.IMPDEP2: case ByteCode.INEG: case ByteCode.INSTANCEOF: case ByteCode.INVOKESTATIC: case ByteCode.L2D: case ByteCode.LALOAD: case ByteCode.LNEG: case ByteCode.NEWARRAY: case ByteCode.NOP: case ByteCode.PUTSTATIC: case ByteCode.RET: case ByteCode.RETURN: case ByteCode.SWAP: case ByteCode.WIDE: return 0; case ByteCode.ACONST_NULL: case ByteCode.ALOAD: case ByteCode.ALOAD_0: case ByteCode.ALOAD_1: case ByteCode.ALOAD_2: case ByteCode.ALOAD_3: case ByteCode.BIPUSH: case ByteCode.DUP: case ByteCode.DUP_X1: case ByteCode.DUP_X2: case ByteCode.F2D: case ByteCode.F2L: case ByteCode.FCONST_0: case ByteCode.FCONST_1: case ByteCode.FCONST_2: case ByteCode.FLOAD: case ByteCode.FLOAD_0: case ByteCode.FLOAD_1: case ByteCode.FLOAD_2: case ByteCode.FLOAD_3: case ByteCode.I2D: case ByteCode.I2L: case ByteCode.ICONST_0: case ByteCode.ICONST_1: case ByteCode.ICONST_2: case ByteCode.ICONST_3: case ByteCode.ICONST_4: case ByteCode.ICONST_5: case ByteCode.ICONST_M1: case ByteCode.ILOAD: case ByteCode.ILOAD_0: case ByteCode.ILOAD_1: case ByteCode.ILOAD_2: case ByteCode.ILOAD_3: case ByteCode.JSR: case ByteCode.JSR_W: case ByteCode.LDC: case ByteCode.LDC_W: case ByteCode.MULTIANEWARRAY: case ByteCode.NEW: case ByteCode.SIPUSH: return 1; case ByteCode.DCONST_0: case ByteCode.DCONST_1: case ByteCode.DLOAD: case ByteCode.DLOAD_0: case ByteCode.DLOAD_1: case ByteCode.DLOAD_2: case ByteCode.DLOAD_3: case ByteCode.DUP2: case ByteCode.DUP2_X1: case ByteCode.DUP2_X2: case ByteCode.LCONST_0: case ByteCode.LCONST_1: case ByteCode.LDC2_W: case ByteCode.LLOAD: case ByteCode.LLOAD_0: case ByteCode.LLOAD_1: case ByteCode.LLOAD_2: case ByteCode.LLOAD_3: return 2; } throw new IllegalArgumentException("Bad opcode: "+opcode); } /* * Number of bytes of operands generated after the opcode. * Not in use currently. */ /* int extra(int opcode) { switch (opcode) { case ByteCode.AALOAD: case ByteCode.AASTORE: case ByteCode.ACONST_NULL: case ByteCode.ALOAD_0: case ByteCode.ALOAD_1: case ByteCode.ALOAD_2: case ByteCode.ALOAD_3: case ByteCode.ARETURN: case ByteCode.ARRAYLENGTH: case ByteCode.ASTORE_0: case ByteCode.ASTORE_1: case ByteCode.ASTORE_2: case ByteCode.ASTORE_3: case ByteCode.ATHROW: case ByteCode.BALOAD: case ByteCode.BASTORE: case ByteCode.BREAKPOINT: case ByteCode.CALOAD: case ByteCode.CASTORE: case ByteCode.D2F: case ByteCode.D2I: case ByteCode.D2L: case ByteCode.DADD: case ByteCode.DALOAD: case ByteCode.DASTORE: case ByteCode.DCMPG: case ByteCode.DCMPL: case ByteCode.DCONST_0: case ByteCode.DCONST_1: case ByteCode.DDIV: case ByteCode.DLOAD_0: case ByteCode.DLOAD_1: case ByteCode.DLOAD_2: case ByteCode.DLOAD_3: case ByteCode.DMUL: case ByteCode.DNEG: case ByteCode.DREM: case ByteCode.DRETURN: case ByteCode.DSTORE_0: case ByteCode.DSTORE_1: case ByteCode.DSTORE_2: case ByteCode.DSTORE_3: case ByteCode.DSUB: case ByteCode.DUP2: case ByteCode.DUP2_X1: case ByteCode.DUP2_X2: case ByteCode.DUP: case ByteCode.DUP_X1: case ByteCode.DUP_X2: case ByteCode.F2D: case ByteCode.F2I: case ByteCode.F2L: case ByteCode.FADD: case ByteCode.FALOAD: case ByteCode.FASTORE: case ByteCode.FCMPG: case ByteCode.FCMPL: case ByteCode.FCONST_0: case ByteCode.FCONST_1: case ByteCode.FCONST_2: case ByteCode.FDIV: case ByteCode.FLOAD_0: case ByteCode.FLOAD_1: case ByteCode.FLOAD_2: case ByteCode.FLOAD_3: case ByteCode.FMUL: case ByteCode.FNEG: case ByteCode.FREM: case ByteCode.FRETURN: case ByteCode.FSTORE_0: case ByteCode.FSTORE_1: case ByteCode.FSTORE_2: case ByteCode.FSTORE_3: case ByteCode.FSUB: case ByteCode.I2B: case ByteCode.I2C: case ByteCode.I2D: case ByteCode.I2F: case ByteCode.I2L: case ByteCode.I2S: case ByteCode.IADD: case ByteCode.IALOAD: case ByteCode.IAND: case ByteCode.IASTORE: case ByteCode.ICONST_0: case ByteCode.ICONST_1: case ByteCode.ICONST_2: case ByteCode.ICONST_3: case ByteCode.ICONST_4: case ByteCode.ICONST_5: case ByteCode.ICONST_M1: case ByteCode.IDIV: case ByteCode.ILOAD_0: case ByteCode.ILOAD_1: case ByteCode.ILOAD_2: case ByteCode.ILOAD_3: case ByteCode.IMPDEP1: case ByteCode.IMPDEP2: case ByteCode.IMUL: case ByteCode.INEG: case ByteCode.IOR: case ByteCode.IREM: case ByteCode.IRETURN: case ByteCode.ISHL: case ByteCode.ISHR: case ByteCode.ISTORE_0: case ByteCode.ISTORE_1: case ByteCode.ISTORE_2: case ByteCode.ISTORE_3: case ByteCode.ISUB: case ByteCode.IUSHR: case ByteCode.IXOR: case ByteCode.L2D: case ByteCode.L2F: case ByteCode.L2I: case ByteCode.LADD: case ByteCode.LALOAD: case ByteCode.LAND: case ByteCode.LASTORE: case ByteCode.LCMP: case ByteCode.LCONST_0: case ByteCode.LCONST_1: case ByteCode.LDIV: case ByteCode.LLOAD_0: case ByteCode.LLOAD_1: case ByteCode.LLOAD_2: case ByteCode.LLOAD_3: case ByteCode.LMUL: case ByteCode.LNEG: case ByteCode.LOR: case ByteCode.LREM: case ByteCode.LRETURN: case ByteCode.LSHL: case ByteCode.LSHR: case ByteCode.LSTORE_0: case ByteCode.LSTORE_1: case ByteCode.LSTORE_2: case ByteCode.LSTORE_3: case ByteCode.LSUB: case ByteCode.LUSHR: case ByteCode.LXOR: case ByteCode.MONITORENTER: case ByteCode.MONITOREXIT: case ByteCode.NOP: case ByteCode.POP2: case ByteCode.POP: case ByteCode.RETURN: case ByteCode.SALOAD: case ByteCode.SASTORE: case ByteCode.SWAP: case ByteCode.WIDE: return 0; case ByteCode.ALOAD: case ByteCode.ASTORE: case ByteCode.BIPUSH: case ByteCode.DLOAD: case ByteCode.DSTORE: case ByteCode.FLOAD: case ByteCode.FSTORE: case ByteCode.ILOAD: case ByteCode.ISTORE: case ByteCode.LDC: case ByteCode.LLOAD: case ByteCode.LSTORE: case ByteCode.NEWARRAY: case ByteCode.RET: return 1; case ByteCode.ANEWARRAY: case ByteCode.CHECKCAST: case ByteCode.GETFIELD: case ByteCode.GETSTATIC: case ByteCode.GOTO: case ByteCode.IFEQ: case ByteCode.IFGE: case ByteCode.IFGT: case ByteCode.IFLE: case ByteCode.IFLT: case ByteCode.IFNE: case ByteCode.IFNONNULL: case ByteCode.IFNULL: case ByteCode.IF_ACMPEQ: case ByteCode.IF_ACMPNE: case ByteCode.IF_ICMPEQ: case ByteCode.IF_ICMPGE: case ByteCode.IF_ICMPGT: case ByteCode.IF_ICMPLE: case ByteCode.IF_ICMPLT: case ByteCode.IF_ICMPNE: case ByteCode.IINC: case ByteCode.INSTANCEOF: case ByteCode.INVOKEINTERFACE: case ByteCode.INVOKESPECIAL: case ByteCode.INVOKESTATIC: case ByteCode.INVOKEVIRTUAL: case ByteCode.JSR: case ByteCode.LDC2_W: case ByteCode.LDC_W: case ByteCode.NEW: case ByteCode.PUTFIELD: case ByteCode.PUTSTATIC: case ByteCode.SIPUSH: return 2; case ByteCode.MULTIANEWARRAY: return 3; case ByteCode.GOTO_W: case ByteCode.JSR_W: return 4; case ByteCode.LOOKUPSWITCH: // depends on alignment case ByteCode.TABLESWITCH: // depends on alignment return -1; } throw new IllegalArgumentException("Bad opcode: "+opcode); } */ private static String bytecodeStr(int code) { if (DEBUGSTACK || DEBUGCODE) { switch (code) { case ByteCode.NOP: return "nop"; case ByteCode.ACONST_NULL: return "aconst_null"; case ByteCode.ICONST_M1: return "iconst_m1"; case ByteCode.ICONST_0: return "iconst_0"; case ByteCode.ICONST_1: return "iconst_1"; case ByteCode.ICONST_2: return "iconst_2"; case ByteCode.ICONST_3: return "iconst_3"; case ByteCode.ICONST_4: return "iconst_4"; case ByteCode.ICONST_5: return "iconst_5"; case ByteCode.LCONST_0: return "lconst_0"; case ByteCode.LCONST_1: return "lconst_1"; case ByteCode.FCONST_0: return "fconst_0"; case ByteCode.FCONST_1: return "fconst_1"; case ByteCode.FCONST_2: return "fconst_2"; case ByteCode.DCONST_0: return "dconst_0"; case ByteCode.DCONST_1: return "dconst_1"; case ByteCode.BIPUSH: return "bipush"; case ByteCode.SIPUSH: return "sipush"; case ByteCode.LDC: return "ldc"; case ByteCode.LDC_W: return "ldc_w"; case ByteCode.LDC2_W: return "ldc2_w"; case ByteCode.ILOAD: return "iload"; case ByteCode.LLOAD: return "lload"; case ByteCode.FLOAD: return "fload"; case ByteCode.DLOAD: return "dload"; case ByteCode.ALOAD: return "aload"; case ByteCode.ILOAD_0: return "iload_0"; case ByteCode.ILOAD_1: return "iload_1"; case ByteCode.ILOAD_2: return "iload_2"; case ByteCode.ILOAD_3: return "iload_3"; case ByteCode.LLOAD_0: return "lload_0"; case ByteCode.LLOAD_1: return "lload_1"; case ByteCode.LLOAD_2: return "lload_2"; case ByteCode.LLOAD_3: return "lload_3"; case ByteCode.FLOAD_0: return "fload_0"; case ByteCode.FLOAD_1: return "fload_1"; case ByteCode.FLOAD_2: return "fload_2"; case ByteCode.FLOAD_3: return "fload_3"; case ByteCode.DLOAD_0: return "dload_0"; case ByteCode.DLOAD_1: return "dload_1"; case ByteCode.DLOAD_2: return "dload_2"; case ByteCode.DLOAD_3: return "dload_3"; case ByteCode.ALOAD_0: return "aload_0"; case ByteCode.ALOAD_1: return "aload_1"; case ByteCode.ALOAD_2: return "aload_2"; case ByteCode.ALOAD_3: return "aload_3"; case ByteCode.IALOAD: return "iaload"; case ByteCode.LALOAD: return "laload"; case ByteCode.FALOAD: return "faload"; case ByteCode.DALOAD: return "daload"; case ByteCode.AALOAD: return "aaload"; case ByteCode.BALOAD: return "baload"; case ByteCode.CALOAD: return "caload"; case ByteCode.SALOAD: return "saload"; case ByteCode.ISTORE: return "istore"; case ByteCode.LSTORE: return "lstore"; case ByteCode.FSTORE: return "fstore"; case ByteCode.DSTORE: return "dstore"; case ByteCode.ASTORE: return "astore"; case ByteCode.ISTORE_0: return "istore_0"; case ByteCode.ISTORE_1: return "istore_1"; case ByteCode.ISTORE_2: return "istore_2"; case ByteCode.ISTORE_3: return "istore_3"; case ByteCode.LSTORE_0: return "lstore_0"; case ByteCode.LSTORE_1: return "lstore_1"; case ByteCode.LSTORE_2: return "lstore_2"; case ByteCode.LSTORE_3: return "lstore_3"; case ByteCode.FSTORE_0: return "fstore_0"; case ByteCode.FSTORE_1: return "fstore_1"; case ByteCode.FSTORE_2: return "fstore_2"; case ByteCode.FSTORE_3: return "fstore_3"; case ByteCode.DSTORE_0: return "dstore_0"; case ByteCode.DSTORE_1: return "dstore_1"; case ByteCode.DSTORE_2: return "dstore_2"; case ByteCode.DSTORE_3: return "dstore_3"; case ByteCode.ASTORE_0: return "astore_0"; case ByteCode.ASTORE_1: return "astore_1"; case ByteCode.ASTORE_2: return "astore_2"; case ByteCode.ASTORE_3: return "astore_3"; case ByteCode.IASTORE: return "iastore"; case ByteCode.LASTORE: return "lastore"; case ByteCode.FASTORE: return "fastore"; case ByteCode.DASTORE: return "dastore"; case ByteCode.AASTORE: return "aastore"; case ByteCode.BASTORE: return "bastore"; case ByteCode.CASTORE: return "castore"; case ByteCode.SASTORE: return "sastore"; case ByteCode.POP: return "pop"; case ByteCode.POP2: return "pop2"; case ByteCode.DUP: return "dup"; case ByteCode.DUP_X1: return "dup_x1"; case ByteCode.DUP_X2: return "dup_x2"; case ByteCode.DUP2: return "dup2"; case ByteCode.DUP2_X1: return "dup2_x1"; case ByteCode.DUP2_X2: return "dup2_x2"; case ByteCode.SWAP: return "swap"; case ByteCode.IADD: return "iadd"; case ByteCode.LADD: return "ladd"; case ByteCode.FADD: return "fadd"; case ByteCode.DADD: return "dadd"; case ByteCode.ISUB: return "isub"; case ByteCode.LSUB: return "lsub"; case ByteCode.FSUB: return "fsub"; case ByteCode.DSUB: return "dsub"; case ByteCode.IMUL: return "imul"; case ByteCode.LMUL: return "lmul"; case ByteCode.FMUL: return "fmul"; case ByteCode.DMUL: return "dmul"; case ByteCode.IDIV: return "idiv"; case ByteCode.LDIV: return "ldiv"; case ByteCode.FDIV: return "fdiv"; case ByteCode.DDIV: return "ddiv"; case ByteCode.IREM: return "irem"; case ByteCode.LREM: return "lrem"; case ByteCode.FREM: return "frem"; case ByteCode.DREM: return "drem"; case ByteCode.INEG: return "ineg"; case ByteCode.LNEG: return "lneg"; case ByteCode.FNEG: return "fneg"; case ByteCode.DNEG: return "dneg"; case ByteCode.ISHL: return "ishl"; case ByteCode.LSHL: return "lshl"; case ByteCode.ISHR: return "ishr"; case ByteCode.LSHR: return "lshr"; case ByteCode.IUSHR: return "iushr"; case ByteCode.LUSHR: return "lushr"; case ByteCode.IAND: return "iand"; case ByteCode.LAND: return "land"; case ByteCode.IOR: return "ior"; case ByteCode.LOR: return "lor"; case ByteCode.IXOR: return "ixor"; case ByteCode.LXOR: return "lxor"; case ByteCode.IINC: return "iinc"; case ByteCode.I2L: return "i2l"; case ByteCode.I2F: return "i2f"; case ByteCode.I2D: return "i2d"; case ByteCode.L2I: return "l2i"; case ByteCode.L2F: return "l2f"; case ByteCode.L2D: return "l2d"; case ByteCode.F2I: return "f2i"; case ByteCode.F2L: return "f2l"; case ByteCode.F2D: return "f2d"; case ByteCode.D2I: return "d2i"; case ByteCode.D2L: return "d2l"; case ByteCode.D2F: return "d2f"; case ByteCode.I2B: return "i2b"; case ByteCode.I2C: return "i2c"; case ByteCode.I2S: return "i2s"; case ByteCode.LCMP: return "lcmp"; case ByteCode.FCMPL: return "fcmpl"; case ByteCode.FCMPG: return "fcmpg"; case ByteCode.DCMPL: return "dcmpl"; case ByteCode.DCMPG: return "dcmpg"; case ByteCode.IFEQ: return "ifeq"; case ByteCode.IFNE: return "ifne"; case ByteCode.IFLT: return "iflt"; case ByteCode.IFGE: return "ifge"; case ByteCode.IFGT: return "ifgt"; case ByteCode.IFLE: return "ifle"; case ByteCode.IF_ICMPEQ: return "if_icmpeq"; case ByteCode.IF_ICMPNE: return "if_icmpne"; case ByteCode.IF_ICMPLT: return "if_icmplt"; case ByteCode.IF_ICMPGE: return "if_icmpge"; case ByteCode.IF_ICMPGT: return "if_icmpgt"; case ByteCode.IF_ICMPLE: return "if_icmple"; case ByteCode.IF_ACMPEQ: return "if_acmpeq"; case ByteCode.IF_ACMPNE: return "if_acmpne"; case ByteCode.GOTO: return "goto"; case ByteCode.JSR: return "jsr"; case ByteCode.RET: return "ret"; case ByteCode.TABLESWITCH: return "tableswitch"; case ByteCode.LOOKUPSWITCH: return "lookupswitch"; case ByteCode.IRETURN: return "ireturn"; case ByteCode.LRETURN: return "lreturn"; case ByteCode.FRETURN: return "freturn"; case ByteCode.DRETURN: return "dreturn"; case ByteCode.ARETURN: return "areturn"; case ByteCode.RETURN: return "return"; case ByteCode.GETSTATIC: return "getstatic"; case ByteCode.PUTSTATIC: return "putstatic"; case ByteCode.GETFIELD: return "getfield"; case ByteCode.PUTFIELD: return "putfield"; case ByteCode.INVOKEVIRTUAL: return "invokevirtual"; case ByteCode.INVOKESPECIAL: return "invokespecial"; case ByteCode.INVOKESTATIC: return "invokestatic"; case ByteCode.INVOKEINTERFACE: return "invokeinterface"; case ByteCode.NEW: return "new"; case ByteCode.NEWARRAY: return "newarray"; case ByteCode.ANEWARRAY: return "anewarray"; case ByteCode.ARRAYLENGTH: return "arraylength"; case ByteCode.ATHROW: return "athrow"; case ByteCode.CHECKCAST: return "checkcast"; case ByteCode.INSTANCEOF: return "instanceof"; case ByteCode.MONITORENTER: return "monitorenter"; case ByteCode.MONITOREXIT: return "monitorexit"; case ByteCode.WIDE: return "wide"; case ByteCode.MULTIANEWARRAY: return "multianewarray"; case ByteCode.IFNULL: return "ifnull"; case ByteCode.IFNONNULL: return "ifnonnull"; case ByteCode.GOTO_W: return "goto_w"; case ByteCode.JSR_W: return "jsr_w"; case ByteCode.BREAKPOINT: return "breakpoint"; case ByteCode.IMPDEP1: return "impdep1"; case ByteCode.IMPDEP2: return "impdep2"; } } return ""; } final char[] getCharBuffer(int minimalSize) { if (minimalSize > tmpCharBuffer.length) { int newSize = tmpCharBuffer.length * 2; if (minimalSize > newSize) { newSize = minimalSize; } tmpCharBuffer = new char[newSize]; } return tmpCharBuffer; } private static final int LineNumberTableSize = 16; private static final int ExceptionTableSize = 4; private final static long FileHeaderConstant = 0xCAFEBABE0003002DL; // Set DEBUG flags to true to get better checking and progress info. private static final boolean DEBUGSTACK = false; private static final boolean DEBUGLABELS = false; private static final boolean DEBUGCODE = false; private String generatedClassName; private ExceptionTableEntry itsExceptionTable[]; private int itsExceptionTableTop; private int itsLineNumberTable[]; // pack start_pc & line_number together private int itsLineNumberTableTop; private byte[] itsCodeBuffer = new byte[256]; private int itsCodeBufferTop; private ConstantPool itsConstantPool; private ClassFileMethod itsCurrentMethod; private short itsStackTop; private short itsMaxStack; private short itsMaxLocals; private ObjArray itsMethods = new ObjArray(); private ObjArray itsFields = new ObjArray(); private ObjArray itsInterfaces = new ObjArray(); private short itsFlags; private short itsThisClassIndex; private short itsSuperClassIndex; private short itsSourceFileNameIndex; private static final int MIN_LABEL_TABLE_SIZE = 32; private int[] itsLabelTable; private int itsLabelTableTop; // itsFixupTable[i] = (label_index << 32) | fixup_site private static final int MIN_FIXUP_TABLE_SIZE = 40; private long[] itsFixupTable; private int itsFixupTableTop; private ObjArray itsVarDescriptors; private char[] tmpCharBuffer = new char[64]; } final class ExceptionTableEntry { ExceptionTableEntry(int startLabel, int endLabel, int handlerLabel, short catchType) { itsStartLabel = startLabel; itsEndLabel = endLabel; itsHandlerLabel = handlerLabel; itsCatchType = catchType; } int itsStartLabel; int itsEndLabel; int itsHandlerLabel; short itsCatchType; } final class ClassFileField { ClassFileField(short nameIndex, short typeIndex, short flags) { itsNameIndex = nameIndex; itsTypeIndex = typeIndex; itsFlags = flags; itsHasAttributes = false; } void setAttributes(short attr1, short attr2, short attr3, int index) { itsHasAttributes = true; itsAttr1 = attr1; itsAttr2 = attr2; itsAttr3 = attr3; itsIndex = index; } int write(byte[] data, int offset) { offset = ClassFileWriter.putInt16(itsFlags, data, offset); offset = ClassFileWriter.putInt16(itsNameIndex, data, offset); offset = ClassFileWriter.putInt16(itsTypeIndex, data, offset); if (!itsHasAttributes) { // write 0 attributes offset = ClassFileWriter.putInt16(0, data, offset); } else { offset = ClassFileWriter.putInt16(1, data, offset); offset = ClassFileWriter.putInt16(itsAttr1, data, offset); offset = ClassFileWriter.putInt16(itsAttr2, data, offset); offset = ClassFileWriter.putInt16(itsAttr3, data, offset); offset = ClassFileWriter.putInt16(itsIndex, data, offset); } return offset; } int getWriteSize() { int size = 2 * 3; if (!itsHasAttributes) { size += 2; } else { size += 2 + 2 * 4; } return size; } private short itsNameIndex; private short itsTypeIndex; private short itsFlags; private boolean itsHasAttributes; private short itsAttr1, itsAttr2, itsAttr3; private int itsIndex; } final class ClassFileMethod { ClassFileMethod(short nameIndex, short typeIndex, short flags) { itsNameIndex = nameIndex; itsTypeIndex = typeIndex; itsFlags = flags; } void setCodeAttribute(byte codeAttribute[]) { itsCodeAttribute = codeAttribute; } int write(byte[] data, int offset) { offset = ClassFileWriter.putInt16(itsFlags, data, offset); offset = ClassFileWriter.putInt16(itsNameIndex, data, offset); offset = ClassFileWriter.putInt16(itsTypeIndex, data, offset); // Code attribute only offset = ClassFileWriter.putInt16(1, data, offset); System.arraycopy(itsCodeAttribute, 0, data, offset, itsCodeAttribute.length); offset += itsCodeAttribute.length; return offset; } int getWriteSize() { return 2 * 4 + itsCodeAttribute.length; } private short itsNameIndex; private short itsTypeIndex; private short itsFlags; private byte[] itsCodeAttribute; } final class ConstantPool { ConstantPool(ClassFileWriter cfw) { this.cfw = cfw; itsTopIndex = 1; // the zero'th entry is reserved itsPool = new byte[ConstantPoolSize]; itsTop = 0; } private static final int ConstantPoolSize = 256; private static final byte CONSTANT_Class = 7, CONSTANT_Fieldref = 9, CONSTANT_Methodref = 10, CONSTANT_InterfaceMethodref = 11, CONSTANT_String = 8, CONSTANT_Integer = 3, CONSTANT_Float = 4, CONSTANT_Long = 5, CONSTANT_Double = 6, CONSTANT_NameAndType = 12, CONSTANT_Utf8 = 1; int write(byte[] data, int offset) { offset = ClassFileWriter.putInt16((short)itsTopIndex, data, offset); System.arraycopy(itsPool, 0, data, offset, itsTop); offset += itsTop; return offset; } int getWriteSize() { return 2 + itsTop; } int addConstant(int k) { ensure(5); itsPool[itsTop++] = CONSTANT_Integer; itsTop = ClassFileWriter.putInt32(k, itsPool, itsTop); return (short)(itsTopIndex++); } int addConstant(long k) { ensure(9); itsPool[itsTop++] = CONSTANT_Long; itsTop = ClassFileWriter.putInt64(k, itsPool, itsTop); int index = itsTopIndex; itsTopIndex += 2; return index; } int addConstant(float k) { ensure(5); itsPool[itsTop++] = CONSTANT_Float; int bits = Float.floatToIntBits(k); itsTop = ClassFileWriter.putInt32(bits, itsPool, itsTop); return itsTopIndex++; } int addConstant(double k) { ensure(9); itsPool[itsTop++] = CONSTANT_Double; long bits = Double.doubleToLongBits(k); itsTop = ClassFileWriter.putInt64(bits, itsPool, itsTop); int index = itsTopIndex; itsTopIndex += 2; return index; } int addConstant(String k) { int utf8Index = 0xFFFF & addUtf8(k); int theIndex = itsStringConstHash.getInt(utf8Index, -1); if (theIndex == -1) { theIndex = itsTopIndex++; ensure(3); itsPool[itsTop++] = CONSTANT_String; itsTop = ClassFileWriter.putInt16(utf8Index, itsPool, itsTop); itsStringConstHash.put(utf8Index, theIndex); } return theIndex; } boolean isUnderUtfEncodingLimit(String s) { int strLen = s.length(); if (strLen * 3 <= MAX_UTF_ENCODING_SIZE) { return true; } else if (strLen > MAX_UTF_ENCODING_SIZE) { return false; } return strLen == getUtfEncodingLimit(s, 0, strLen); } /** * Get maximum i such that start <= i <= end and * s.substring(start, i) fits JVM UTF string encoding limit. */ int getUtfEncodingLimit(String s, int start, int end) { if ((end - start) * 3 <= MAX_UTF_ENCODING_SIZE) { return end; } int limit = MAX_UTF_ENCODING_SIZE; for (int i = start; i != end; i++) { int c = s.charAt(i); if (0 != c && c <= 0x7F) { --limit; } else if (c < 0x7FF) { limit -= 2; } else { limit -= 3; } if (limit < 0) { return i; } } return end; } short addUtf8(String k) { int theIndex = itsUtf8Hash.get(k, -1); if (theIndex == -1) { int strLen = k.length(); boolean tooBigString; if (strLen > MAX_UTF_ENCODING_SIZE) { tooBigString = true; } else { tooBigString = false; // Ask for worst case scenario buffer when each char takes 3 // bytes ensure(1 + 2 + strLen * 3); int top = itsTop; itsPool[top++] = CONSTANT_Utf8; top += 2; // skip length char[] chars = cfw.getCharBuffer(strLen); k.getChars(0, strLen, chars, 0); for (int i = 0; i != strLen; i++) { int c = chars[i]; if (c != 0 && c <= 0x7F) { itsPool[top++] = (byte)c; } else if (c > 0x7FF) { itsPool[top++] = (byte)(0xE0 | (c >> 12)); itsPool[top++] = (byte)(0x80 | ((c >> 6) & 0x3F)); itsPool[top++] = (byte)(0x80 | (c & 0x3F)); } else { itsPool[top++] = (byte)(0xC0 | (c >> 6)); itsPool[top++] = (byte)(0x80 | (c & 0x3F)); } } int utfLen = top - (itsTop + 1 + 2); if (utfLen > MAX_UTF_ENCODING_SIZE) { tooBigString = true; } else { // Write back length itsPool[itsTop + 1] = (byte)(utfLen >>> 8); itsPool[itsTop + 2] = (byte)utfLen; itsTop = top; theIndex = itsTopIndex++; itsUtf8Hash.put(k, theIndex); } } if (tooBigString) { throw new IllegalArgumentException("Too big string"); } } return (short)theIndex; } private short addNameAndType(String name, String type) { short nameIndex = addUtf8(name); short typeIndex = addUtf8(type); ensure(5); itsPool[itsTop++] = CONSTANT_NameAndType; itsTop = ClassFileWriter.putInt16(nameIndex, itsPool, itsTop); itsTop = ClassFileWriter.putInt16(typeIndex, itsPool, itsTop); return (short)(itsTopIndex++); } short addClass(String className) { int theIndex = itsClassHash.get(className, -1); if (theIndex == -1) { String slashed = className; if (className.indexOf('.') > 0) { slashed = ClassFileWriter.getSlashedForm(className); theIndex = itsClassHash.get(slashed, -1); if (theIndex != -1) { itsClassHash.put(className, theIndex); } } if (theIndex == -1) { int utf8Index = addUtf8(slashed); ensure(3); itsPool[itsTop++] = CONSTANT_Class; itsTop = ClassFileWriter.putInt16(utf8Index, itsPool, itsTop); theIndex = itsTopIndex++; itsClassHash.put(slashed, theIndex); if (className != slashed) { itsClassHash.put(className, theIndex); } } } return (short)theIndex; } short addFieldRef(String className, String fieldName, String fieldType) { FieldOrMethodRef ref = new FieldOrMethodRef(className, fieldName, fieldType); int theIndex = itsFieldRefHash.get(ref, -1); if (theIndex == -1) { short ntIndex = addNameAndType(fieldName, fieldType); short classIndex = addClass(className); ensure(5); itsPool[itsTop++] = CONSTANT_Fieldref; itsTop = ClassFileWriter.putInt16(classIndex, itsPool, itsTop); itsTop = ClassFileWriter.putInt16(ntIndex, itsPool, itsTop); theIndex = itsTopIndex++; itsFieldRefHash.put(ref, theIndex); } return (short)theIndex; } short addMethodRef(String className, String methodName, String methodType) { FieldOrMethodRef ref = new FieldOrMethodRef(className, methodName, methodType); int theIndex = itsMethodRefHash.get(ref, -1); if (theIndex == -1) { short ntIndex = addNameAndType(methodName, methodType); short classIndex = addClass(className); ensure(5); itsPool[itsTop++] = CONSTANT_Methodref; itsTop = ClassFileWriter.putInt16(classIndex, itsPool, itsTop); itsTop = ClassFileWriter.putInt16(ntIndex, itsPool, itsTop); theIndex = itsTopIndex++; itsMethodRefHash.put(ref, theIndex); } return (short)theIndex; } short addInterfaceMethodRef(String className, String methodName, String methodType) { short ntIndex = addNameAndType(methodName, methodType); short classIndex = addClass(className); ensure(5); itsPool[itsTop++] = CONSTANT_InterfaceMethodref; itsTop = ClassFileWriter.putInt16(classIndex, itsPool, itsTop); itsTop = ClassFileWriter.putInt16(ntIndex, itsPool, itsTop); return (short)(itsTopIndex++); } void ensure(int howMuch) { if (itsTop + howMuch > itsPool.length) { int newCapacity = itsPool.length * 2; if (itsTop + howMuch > newCapacity) { newCapacity = itsTop + howMuch; } byte[] tmp = new byte[newCapacity]; System.arraycopy(itsPool, 0, tmp, 0, itsTop); itsPool = tmp; } } private ClassFileWriter cfw; private static final int MAX_UTF_ENCODING_SIZE = 65535; private UintMap itsStringConstHash = new UintMap(); private ObjToIntMap itsUtf8Hash = new ObjToIntMap(); private ObjToIntMap itsFieldRefHash = new ObjToIntMap(); private ObjToIntMap itsMethodRefHash = new ObjToIntMap(); private ObjToIntMap itsClassHash = new ObjToIntMap(); private int itsTop; private int itsTopIndex; private byte itsPool[]; } final class FieldOrMethodRef { FieldOrMethodRef(String className, String name, String type) { this.className = className; this.name = name; this.type = type; } public boolean equals(Object obj) { if (!(obj instanceof FieldOrMethodRef)) { return false; } FieldOrMethodRef x = (FieldOrMethodRef)obj; return className.equals(x.className) && name.equals(x.name) && type.equals(x.type); } public int hashCode() { if (hashCode == -1) { int h1 = className.hashCode(); int h2 = name.hashCode(); int h3 = type.hashCode(); hashCode = h1 ^ h2 ^ h3; } return hashCode; } private String className; private String name; private String type; private int hashCode = -1; }