| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| /* |
| * Contributor(s): Thomas Ball |
| */ |
| |
| package org.netbeans.modules.classfile; |
| |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| |
| /** |
| * The Code attribute of a method. |
| * |
| * @author Thomas Ball |
| */ |
| public final class Code { |
| private static final boolean debug = false; |
| |
| private int maxStack; |
| private int maxLocals; |
| private byte[] byteCodes; |
| private ExceptionTableEntry[] exceptionTable; |
| private int[] lineNumberTable; |
| private LocalVariableTableEntry[] localVariableTable; |
| private LocalVariableTypeTableEntry[] localVariableTypeTable; |
| private StackMapFrame[] stackMapTable; |
| |
| /** Creates a new Code object */ |
| /* package-private */ Code(DataInputStream in, ConstantPool pool) throws IOException { |
| if (in == null) |
| throw new IllegalArgumentException("input stream not specified"); |
| if (pool == null) |
| throw new IllegalArgumentException("constant pool not specified"); |
| try { |
| loadCode(in, pool); |
| } catch (IndexOutOfBoundsException e) { |
| throw new InvalidClassFileAttributeException("invalid code attribute", e); |
| } |
| } |
| |
| private void loadCode(DataInputStream in, ConstantPool pool) |
| throws IOException { |
| maxStack = in.readUnsignedShort(); |
| maxLocals = in.readUnsignedShort(); |
| int len = in.readInt(); |
| byteCodes = new byte[len]; |
| in.readFully(byteCodes); |
| exceptionTable = ExceptionTableEntry.loadExceptionTable(in, pool); |
| loadCodeAttributes(in, pool); |
| } |
| |
| private void loadCodeAttributes(DataInputStream in, ConstantPool pool) |
| throws IOException { |
| int count = in.readUnsignedShort(); |
| for (int i = 0; i < count; i++) { |
| Object o = pool.get(in.readUnsignedShort()); |
| if (!(o instanceof CPUTF8Info)) |
| throw new InvalidClassFormatException(); |
| CPUTF8Info entry = (CPUTF8Info)o; |
| int len = in.readInt(); |
| String name = entry.getName(); |
| if (name.equals("LineNumberTable")) //NOI18N |
| loadLineNumberTable(in, pool); |
| else if (name.equals("LocalVariableTable")) //NOI18N |
| localVariableTable = |
| LocalVariableTableEntry.loadLocalVariableTable(in, pool); |
| else if (name.equals("LocalVariableTypeTable")) //NOI18N |
| localVariableTypeTable = |
| LocalVariableTypeTableEntry.loadLocalVariableTypeTable(in, pool); |
| else if (name.equals("StackMapTable")) //NOI18N |
| stackMapTable = StackMapFrame.loadStackMapTable(in, pool); |
| else { |
| if (debug) |
| System.out.println("skipped unknown code attribute: " + name); |
| // ignore unknown attribute... |
| int n; |
| while ((n = (int)in.skip(len)) > 0 && n < len) |
| len -= n; |
| } |
| } |
| if (lineNumberTable == null) |
| lineNumberTable = new int[0]; |
| if (localVariableTable == null) |
| localVariableTable = new LocalVariableTableEntry[0]; |
| if (localVariableTypeTable == null) |
| localVariableTypeTable = new LocalVariableTypeTableEntry[0]; |
| if (stackMapTable == null) |
| stackMapTable = new StackMapFrame[0]; |
| } |
| |
| private void loadLineNumberTable(DataInputStream in, ConstantPool pool) throws IOException { |
| int n = in.readUnsignedShort(); |
| lineNumberTable = new int[n * 2]; |
| for (int i = 0; i < n; i++) { |
| lineNumberTable[i * 2] = in.readUnsignedShort(); // start_pc |
| lineNumberTable[i * 2 + 1] = in.readUnsignedShort(); // line_number |
| } |
| } |
| |
| public final int getMaxStack() { |
| return maxStack; |
| } |
| |
| public final int getMaxLocals() { |
| return maxLocals; |
| } |
| |
| public final byte[] getByteCodes() { |
| return byteCodes.clone(); |
| } |
| |
| public final ExceptionTableEntry[] getExceptionTable() { |
| return exceptionTable.clone(); |
| } |
| |
| /** |
| * Returns an array of int pairs consisting of a start_pc and a |
| * line_number. For example, [0] = first pc, [1] = first line, |
| * [2] = second pc, etc. |
| */ |
| public final int[] getLineNumberTable() { |
| return lineNumberTable.clone(); |
| } |
| |
| /** |
| * Returns the local variable table for this code. |
| */ |
| public final LocalVariableTableEntry[] getLocalVariableTable() { |
| return localVariableTable.clone(); |
| } |
| |
| /** |
| * Returns the local variable type table for this code, which |
| * describes the generic reference type for those variables which |
| * are generic. |
| */ |
| public final LocalVariableTypeTableEntry[] getLocalVariableTypeTable() { |
| return localVariableTypeTable.clone(); |
| } |
| |
| /** |
| * Returns the stack map table for this code, which defines the stack frame |
| * information needed by the new classfile verifier in Java 6. |
| */ |
| public final StackMapFrame[] getStackMapTable() { |
| return stackMapTable.clone(); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuffer sb = new StringBuffer("Code: bytes="); |
| sb.append(byteCodes.length); |
| sb.append(", stack="); |
| sb.append(maxStack); |
| sb.append(", locals="); |
| sb.append(maxLocals); |
| return sb.toString(); |
| } |
| } |