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src/share/classes/com/sun/tools/javap/LocalVariableTypeTableWriter.java@2eb010b6cb22 (annotated)

src/share/classes/com/sun/tools/javap/LocalVariableTypeTableWriter.java

Thu, 31 Aug 2017 15:17:03 +0800

author

aoqi

date

Thu, 31 Aug 2017 15:17:03 +0800

changeset 2525

2eb010b6cb22

parent 581

f2fdd52e4e87

parent 0

959103a6100f

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25
aoqi@0	26	package com.sun.tools.javap;
aoqi@0	27
aoqi@0	28	import com.sun.tools.classfile.Attribute;
aoqi@0	29	import com.sun.tools.classfile.Code_attribute;
aoqi@0	30	import com.sun.tools.classfile.ConstantPool;
aoqi@0	31	import com.sun.tools.classfile.ConstantPoolException;
aoqi@0	32	import com.sun.tools.classfile.Descriptor;
aoqi@0	33	import com.sun.tools.classfile.Descriptor.InvalidDescriptor;
aoqi@0	34	import com.sun.tools.classfile.Instruction;
aoqi@0	35	import com.sun.tools.classfile.LocalVariableTypeTable_attribute;
aoqi@0	36	import com.sun.tools.classfile.Signature;
aoqi@0	37	import java.util.ArrayList;
aoqi@0	38	import java.util.HashMap;
aoqi@0	39	import java.util.List;
aoqi@0	40	import java.util.ListIterator;
aoqi@0	41	import java.util.Map;
aoqi@0	42
aoqi@0	43	/**
aoqi@0	44	* Annotate instructions with details about local variables.
aoqi@0	45	*
aoqi@0	46	* <p><b>This is NOT part of any supported API.
aoqi@0	47	* If you write code that depends on this, you do so at your own risk.
aoqi@0	48	* This code and its internal interfaces are subject to change or
aoqi@0	49	* deletion without notice.</b>
aoqi@0	50	*/
aoqi@0	51	public class LocalVariableTypeTableWriter extends InstructionDetailWriter {
aoqi@0	52	public enum NoteKind {
aoqi@0	53	START("start") {
aoqi@0	54	public boolean match(LocalVariableTypeTable_attribute.Entry entry, int pc) {
aoqi@0	55	return (pc == entry.start_pc);
aoqi@0	56	}
aoqi@0	57	},
aoqi@0	58	END("end") {
aoqi@0	59	public boolean match(LocalVariableTypeTable_attribute.Entry entry, int pc) {
aoqi@0	60	return (pc == entry.start_pc + entry.length);
aoqi@0	61	}
aoqi@0	62	};
aoqi@0	63	NoteKind(String text) {
aoqi@0	64	this.text = text;
aoqi@0	65	}
aoqi@0	66	public abstract boolean match(LocalVariableTypeTable_attribute.Entry entry, int pc);
aoqi@0	67	public final String text;
aoqi@0	68	};
aoqi@0	69
aoqi@0	70	static LocalVariableTypeTableWriter instance(Context context) {
aoqi@0	71	LocalVariableTypeTableWriter instance = context.get(LocalVariableTypeTableWriter.class);
aoqi@0	72	if (instance == null)
aoqi@0	73	instance = new LocalVariableTypeTableWriter(context);
aoqi@0	74	return instance;
aoqi@0	75	}
aoqi@0	76
aoqi@0	77	protected LocalVariableTypeTableWriter(Context context) {
aoqi@0	78	super(context);
aoqi@0	79	context.put(LocalVariableTypeTableWriter.class, this);
aoqi@0	80	classWriter = ClassWriter.instance(context);
aoqi@0	81	}
aoqi@0	82
aoqi@0	83	public void reset(Code_attribute attr) {
aoqi@0	84	codeAttr = attr;
aoqi@0	85	pcMap = new HashMap<Integer, List<LocalVariableTypeTable_attribute.Entry>>();
aoqi@0	86	LocalVariableTypeTable_attribute lvt =
aoqi@0	87	(LocalVariableTypeTable_attribute) (attr.attributes.get(Attribute.LocalVariableTypeTable));
aoqi@0	88	if (lvt == null)
aoqi@0	89	return;
aoqi@0	90
aoqi@0	91	for (int i = 0; i < lvt.local_variable_table.length; i++) {
aoqi@0	92	LocalVariableTypeTable_attribute.Entry entry = lvt.local_variable_table[i];
aoqi@0	93	put(entry.start_pc, entry);
aoqi@0	94	put(entry.start_pc + entry.length, entry);
aoqi@0	95	}
aoqi@0	96	}
aoqi@0	97
aoqi@0	98	public void writeDetails(Instruction instr) {
aoqi@0	99	int pc = instr.getPC();
aoqi@0	100	writeLocalVariables(pc, NoteKind.END);
aoqi@0	101	writeLocalVariables(pc, NoteKind.START);
aoqi@0	102	}
aoqi@0	103
aoqi@0	104	@Override
aoqi@0	105	public void flush() {
aoqi@0	106	int pc = codeAttr.code_length;
aoqi@0	107	writeLocalVariables(pc, NoteKind.END);
aoqi@0	108	}
aoqi@0	109
aoqi@0	110	public void writeLocalVariables(int pc, NoteKind kind) {
aoqi@0	111	ConstantPool constant_pool = classWriter.getClassFile().constant_pool;
aoqi@0	112	String indent = space(2); // get from Options?
aoqi@0	113	List<LocalVariableTypeTable_attribute.Entry> entries = pcMap.get(pc);
aoqi@0	114	if (entries != null) {
aoqi@0	115	for (ListIterator<LocalVariableTypeTable_attribute.Entry> iter =
aoqi@0	116	entries.listIterator(kind == NoteKind.END ? entries.size() : 0);
aoqi@0	117	kind == NoteKind.END ? iter.hasPrevious() : iter.hasNext() ; ) {
aoqi@0	118	LocalVariableTypeTable_attribute.Entry entry =
aoqi@0	119	kind == NoteKind.END ? iter.previous() : iter.next();
aoqi@0	120	if (kind.match(entry, pc)) {
aoqi@0	121	print(indent);
aoqi@0	122	print(kind.text);
aoqi@0	123	print(" generic local ");
aoqi@0	124	print(entry.index);
aoqi@0	125	print(" // ");
aoqi@0	126	Descriptor d = new Signature(entry.signature_index);
aoqi@0	127	try {
aoqi@0	128	print(d.getFieldType(constant_pool).toString().replace("/", "."));
aoqi@0	129	} catch (InvalidDescriptor e) {
aoqi@0	130	print(report(e));
aoqi@0	131	} catch (ConstantPoolException e) {
aoqi@0	132	print(report(e));
aoqi@0	133	}
aoqi@0	134	print(" ");
aoqi@0	135	try {
aoqi@0	136	print(constant_pool.getUTF8Value(entry.name_index));
aoqi@0	137	} catch (ConstantPoolException e) {
aoqi@0	138	print(report(e));
aoqi@0	139	}
aoqi@0	140	println();
aoqi@0	141	}
aoqi@0	142	}
aoqi@0	143	}
aoqi@0	144	}
aoqi@0	145
aoqi@0	146	private void put(int pc, LocalVariableTypeTable_attribute.Entry entry) {
aoqi@0	147	List<LocalVariableTypeTable_attribute.Entry> list = pcMap.get(pc);
aoqi@0	148	if (list == null) {
aoqi@0	149	list = new ArrayList<LocalVariableTypeTable_attribute.Entry>();
aoqi@0	150	pcMap.put(pc, list);
aoqi@0	151	}
aoqi@0	152	if (!list.contains(entry))
aoqi@0	153	list.add(entry);
aoqi@0	154	}
aoqi@0	155
aoqi@0	156	private ClassWriter classWriter;
aoqi@0	157	private Code_attribute codeAttr;
aoqi@0	158	private Map<Integer, List<LocalVariableTypeTable_attribute.Entry>> pcMap;
aoqi@0	159	}