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344 lines
13 KiB
Java
344 lines
13 KiB
Java
/*
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* Copyright (c) 2007, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.tools.javap;
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import java.lang.classfile.constantpool.*;
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import static java.lang.classfile.constantpool.PoolEntry.*;
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/*
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* Write a constant pool entry.
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*
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* <p><b>This is NOT part of any supported API.
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* If you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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public class ConstantWriter extends BasicWriter {
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public static ConstantWriter instance(Context context) {
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ConstantWriter instance = context.get(ConstantWriter.class);
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if (instance == null)
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instance = new ConstantWriter(context);
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return instance;
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}
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protected ConstantWriter(Context context) {
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super(context);
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context.put(ConstantWriter.class, this);
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classWriter = ClassWriter.instance(context);
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options = Options.instance(context);
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}
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protected void writeConstantPool() {
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var constant_pool = classWriter.getClassModel().constantPool();
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writeConstantPool(constant_pool);
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}
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protected void writeConstantPool(ConstantPool constant_pool) {
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println("Constant pool:");
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indent(+1);
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int width = String.valueOf(constant_pool.size()).length() + 1;
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int cpx = 1;
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while (cpx < constant_pool.size()) {
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print(String.format("%" + width + "s", ("#" + cpx)));
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try {
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var cpInfo = constant_pool.entryByIndex(cpx);
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print(String.format(" = %-18s ", cpTagName(cpInfo.tag())));
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switch (cpInfo) {
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case ClassEntry info -> {
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print(() -> "#" + info.name().index());
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tab();
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println(() -> "// " + stringValue(info));
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}
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case AnnotationConstantValueEntry info -> {
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println(() -> stringValue(info));
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}
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case MemberRefEntry info -> {
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print(() -> "#" + info.owner().index() + ".#"
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+ info.nameAndType().index());
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tab();
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println(() -> "// " + stringValue(info));
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}
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case DynamicConstantPoolEntry info -> {
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print(() -> "#" + info.bootstrapMethodIndex() + ":#"
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+ info.nameAndType().index());
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tab();
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println(() -> "// " + stringValue(info));
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}
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case MethodHandleEntry info -> {
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print(() -> info.kind() + ":#" + info.reference().index());
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tab();
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println(() -> "// " + stringValue(info));
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}
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case MethodTypeEntry info -> {
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print(() -> "#" + info.descriptor().index());
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tab();
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println(() -> "// " + stringValue(info));
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}
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case ModuleEntry info -> {
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print(() -> "#" + info.name().index());
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tab();
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println(() -> "// " + stringValue(info));
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}
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case NameAndTypeEntry info -> {
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print(() -> "#" + info.name().index() + ":#" + info.type().index());
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tab();
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println(() -> "// " + stringValue(info));
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}
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case PackageEntry info -> {
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print(() -> "#" + info.name().index());
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tab();
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println("// " + stringValue(info));
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}
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case StringEntry info -> {
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print(() -> "#" + info.utf8().index());
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tab();
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println(() -> "// " + stringValue(info));
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}
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default ->
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throw new IllegalArgumentException("unknown entry: "+ cpInfo);
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}
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cpx += cpInfo.width();
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} catch (IllegalArgumentException e) {
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println(report(e));
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cpx++;
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}
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}
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indent(-1);
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}
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protected void write(int cpx) {
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if (cpx == 0) {
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print("#0");
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return;
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}
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var classModel = classWriter.getClassModel();
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var cpInfo = classModel.constantPool().entryByIndex(cpx);
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var tag = cpInfo.tag();
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if (cpInfo instanceof MemberRefEntry ref) {
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// simplify references within this class
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if (ref.owner().index() == classModel.thisClass().index())
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cpInfo = ref.nameAndType();
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}
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print(tagName(tag) + " " + stringValue(cpInfo));
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}
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String cpTagName(int tag) {
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return switch (tag) {
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case TAG_UTF8 -> "Utf8";
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case TAG_INTEGER -> "Integer";
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case TAG_FLOAT -> "Float";
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case TAG_LONG -> "Long";
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case TAG_DOUBLE -> "Double";
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case TAG_CLASS -> "Class";
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case TAG_STRING -> "String";
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case TAG_FIELDREF -> "Fieldref";
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case TAG_METHOD_HANDLE -> "MethodHandle";
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case TAG_METHOD_TYPE -> "MethodType";
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case TAG_METHODREF -> "Methodref";
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case TAG_INTERFACE_METHODREF -> "InterfaceMethodref";
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case TAG_INVOKE_DYNAMIC -> "InvokeDynamic";
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case TAG_DYNAMIC -> "Dynamic";
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case TAG_NAME_AND_TYPE -> "NameAndType";
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default -> "Unknown";
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};
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}
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String tagName(int tag) {
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return switch (tag) {
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case TAG_UTF8 -> "Utf8";
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case TAG_INTEGER -> "int";
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case TAG_FLOAT -> "float";
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case TAG_LONG -> "long";
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case TAG_DOUBLE -> "double";
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case TAG_CLASS -> "class";
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case TAG_STRING -> "String";
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case TAG_FIELDREF -> "Field";
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case TAG_METHOD_HANDLE -> "MethodHandle";
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case TAG_METHOD_TYPE -> "MethodType";
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case TAG_METHODREF -> "Method";
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case TAG_INTERFACE_METHODREF -> "InterfaceMethod";
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case TAG_INVOKE_DYNAMIC -> "InvokeDynamic";
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case TAG_DYNAMIC -> "Dynamic";
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case TAG_NAME_AND_TYPE -> "NameAndType";
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default -> "(unknown tag " + tag + ")";
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};
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}
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String booleanValue(PoolEntry info) {
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if (info instanceof IntegerEntry ie) {
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switch (ie.intValue()) {
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case 0: return "false";
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case 1: return "true";
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}
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}
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return "#" + info.index();
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}
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String booleanValue(int constant_pool_index) {
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var info = classWriter.getClassModel().constantPool()
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.entryByIndex(constant_pool_index);
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if (info instanceof IntegerEntry ie) {
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switch (ie.intValue()) {
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case 0: return "false";
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case 1: return "true";
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}
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}
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return "#" + constant_pool_index;
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}
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String charValue(PoolEntry info) {
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if (info instanceof IntegerEntry ie) {
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int value = ie.intValue();
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return String.valueOf((char) value);
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} else {
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return "#" + info.index();
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}
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}
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String charValue(int constant_pool_index) {
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var info = classWriter.getClassModel().constantPool()
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.entryByIndex(constant_pool_index);
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if (info instanceof IntegerEntry ie) {
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int value = ie.intValue();
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return String.valueOf((char) value);
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} else {
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return "#" + constant_pool_index;
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}
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}
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String stringValue(int constant_pool_index) {
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return stringValue(classWriter.getClassModel().constantPool()
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.entryByIndex(constant_pool_index));
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}
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String stringValue(PoolEntry cpInfo) {
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return switch (cpInfo) {
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case ClassEntry info -> checkName(info.asInternalName());
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case DoubleEntry info -> info.doubleValue() + "d";
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case MemberRefEntry info -> checkName(info.owner().asInternalName())
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+ '.' + stringValue(info.nameAndType());
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case FloatEntry info -> info.floatValue()+ "f";
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case IntegerEntry info -> String.valueOf(info.intValue());
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case DynamicConstantPoolEntry info -> "#" + info.bootstrapMethodIndex()
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+ ":" + stringValue(info.nameAndType());
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case LongEntry info -> info.longValue()+ "l";
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case ModuleEntry info -> checkName(info.name().stringValue());
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case NameAndTypeEntry info -> checkName(info.name().stringValue())
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+ ':' + info.type().stringValue();
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case PackageEntry info -> checkName(info.name().stringValue());
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case MethodHandleEntry info -> {
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String kind = switch (info.asSymbol().kind()) {
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case STATIC, INTERFACE_STATIC -> "REF_invokeStatic";
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case VIRTUAL -> "REF_invokeVirtual";
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case INTERFACE_VIRTUAL -> "REF_invokeInterface";
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case SPECIAL, INTERFACE_SPECIAL -> "REF_invokeSpecial";
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case CONSTRUCTOR -> "REF_newInvokeSpecial";
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case GETTER -> "REF_getField";
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case SETTER -> "REF_putField";
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case STATIC_GETTER -> "REF_getStatic";
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case STATIC_SETTER -> "REF_putStatic";
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};
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yield kind + " " + stringValue(info.reference());
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}
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case MethodTypeEntry info -> info.descriptor().stringValue();
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case StringEntry info -> stringValue(info.utf8());
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case Utf8Entry info -> {
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StringBuilder sb = new StringBuilder();
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for (char c : info.stringValue().toCharArray()) {
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sb.append(switch (c) {
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case '\t' -> "\\t";
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case '\n' -> "\\n";
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case '\r' -> "\\r";
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case '\b' -> "\\b";
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case '\f' -> "\\f";
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case '\"' -> "\\\"";
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case '\'' -> "\\\'";
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case '\\' -> "\\\\";
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default -> Character.isISOControl(c)
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? String.format("\\u%04x", (int) c) : c;
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});
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}
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yield sb.toString();
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}
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default -> throw new IllegalArgumentException("unknown " + cpInfo);
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};
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}
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/* If name is a valid binary name, return it; otherwise quote it. */
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private static String checkName(String name) {
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if (name == null)
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return "null";
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int len = name.length();
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if (len == 0)
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return "\"\"";
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int cc = '/';
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int cp;
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for (int k = 0; k < len; k += Character.charCount(cp)) {
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cp = name.codePointAt(k);
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if ((cc == '/' && !Character.isJavaIdentifierStart(cp))
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|| (cp != '/' && !Character.isJavaIdentifierPart(cp))) {
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return "\"" + addEscapes(name) + "\"";
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}
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cc = cp;
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}
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return name;
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}
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/* If name requires escapes, put them in, so it can be a string body. */
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private static String addEscapes(String name) {
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String esc = "\\\"\n\t";
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String rep = "\\\"nt";
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StringBuilder buf = null;
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int nextk = 0;
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int len = name.length();
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for (int k = 0; k < len; k++) {
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char cp = name.charAt(k);
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int n = esc.indexOf(cp);
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if (n >= 0) {
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if (buf == null)
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buf = new StringBuilder(len * 2);
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if (nextk < k)
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buf.append(name, nextk, k);
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buf.append('\\');
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buf.append(rep.charAt(n));
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nextk = k+1;
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}
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}
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if (buf == null)
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return name;
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if (nextk < len)
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buf.append(name, nextk, len);
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return buf.toString();
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}
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private final ClassWriter classWriter;
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private final Options options;
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}
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