| /* |
| * Copyright (c) 2009, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 com.sun.tools.javap; |
| |
| import com.sun.tools.classfile.Attribute; |
| import com.sun.tools.classfile.Code_attribute; |
| import com.sun.tools.classfile.ConstantPool; |
| import com.sun.tools.classfile.ConstantPoolException; |
| import com.sun.tools.classfile.Descriptor; |
| import com.sun.tools.classfile.Descriptor.InvalidDescriptor; |
| import com.sun.tools.classfile.Instruction; |
| import com.sun.tools.classfile.LocalVariableTypeTable_attribute; |
| import com.sun.tools.classfile.Signature; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.ListIterator; |
| import java.util.Map; |
| |
| /** |
| * Annotate instructions with details about local variables. |
| * |
| * <p><b>This is NOT part of any supported API. |
| * If you write code that depends on this, you do so at your own risk. |
| * This code and its internal interfaces are subject to change or |
| * deletion without notice.</b> |
| */ |
| public class LocalVariableTypeTableWriter extends InstructionDetailWriter { |
| public enum NoteKind { |
| START("start") { |
| public boolean match(LocalVariableTypeTable_attribute.Entry entry, int pc) { |
| return (pc == entry.start_pc); |
| } |
| }, |
| END("end") { |
| public boolean match(LocalVariableTypeTable_attribute.Entry entry, int pc) { |
| return (pc == entry.start_pc + entry.length); |
| } |
| }; |
| NoteKind(String text) { |
| this.text = text; |
| } |
| public abstract boolean match(LocalVariableTypeTable_attribute.Entry entry, int pc); |
| public final String text; |
| } |
| |
| static LocalVariableTypeTableWriter instance(Context context) { |
| LocalVariableTypeTableWriter instance = context.get(LocalVariableTypeTableWriter.class); |
| if (instance == null) |
| instance = new LocalVariableTypeTableWriter(context); |
| return instance; |
| } |
| |
| protected LocalVariableTypeTableWriter(Context context) { |
| super(context); |
| context.put(LocalVariableTypeTableWriter.class, this); |
| classWriter = ClassWriter.instance(context); |
| } |
| |
| public void reset(Code_attribute attr) { |
| codeAttr = attr; |
| pcMap = new HashMap<>(); |
| LocalVariableTypeTable_attribute lvt = |
| (LocalVariableTypeTable_attribute) (attr.attributes.get(Attribute.LocalVariableTypeTable)); |
| if (lvt == null) |
| return; |
| |
| for (int i = 0; i < lvt.local_variable_table.length; i++) { |
| LocalVariableTypeTable_attribute.Entry entry = lvt.local_variable_table[i]; |
| put(entry.start_pc, entry); |
| put(entry.start_pc + entry.length, entry); |
| } |
| } |
| |
| public void writeDetails(Instruction instr) { |
| int pc = instr.getPC(); |
| writeLocalVariables(pc, NoteKind.END); |
| writeLocalVariables(pc, NoteKind.START); |
| } |
| |
| @Override |
| public void flush() { |
| int pc = codeAttr.code_length; |
| writeLocalVariables(pc, NoteKind.END); |
| } |
| |
| public void writeLocalVariables(int pc, NoteKind kind) { |
| ConstantPool constant_pool = classWriter.getClassFile().constant_pool; |
| String indent = space(2); // get from Options? |
| List<LocalVariableTypeTable_attribute.Entry> entries = pcMap.get(pc); |
| if (entries != null) { |
| for (ListIterator<LocalVariableTypeTable_attribute.Entry> iter = |
| entries.listIterator(kind == NoteKind.END ? entries.size() : 0); |
| kind == NoteKind.END ? iter.hasPrevious() : iter.hasNext() ; ) { |
| LocalVariableTypeTable_attribute.Entry entry = |
| kind == NoteKind.END ? iter.previous() : iter.next(); |
| if (kind.match(entry, pc)) { |
| print(indent); |
| print(kind.text); |
| print(" generic local "); |
| print(entry.index); |
| print(" // "); |
| Descriptor d = new Signature(entry.signature_index); |
| try { |
| print(d.getFieldType(constant_pool).toString().replace("/", ".")); |
| } catch (InvalidDescriptor e) { |
| print(report(e)); |
| } catch (ConstantPoolException e) { |
| print(report(e)); |
| } |
| print(" "); |
| try { |
| print(constant_pool.getUTF8Value(entry.name_index)); |
| } catch (ConstantPoolException e) { |
| print(report(e)); |
| } |
| println(); |
| } |
| } |
| } |
| } |
| |
| private void put(int pc, LocalVariableTypeTable_attribute.Entry entry) { |
| List<LocalVariableTypeTable_attribute.Entry> list = pcMap.get(pc); |
| if (list == null) { |
| list = new ArrayList<>(); |
| pcMap.put(pc, list); |
| } |
| if (!list.contains(entry)) |
| list.add(entry); |
| } |
| |
| private ClassWriter classWriter; |
| private Code_attribute codeAttr; |
| private Map<Integer, List<LocalVariableTypeTable_attribute.Entry>> pcMap; |
| } |