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370 lines
11 KiB
C++
370 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef _ClassFileReader_H_
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#define _ClassFileReader_H_
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "ConstantPool.h"
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#include "Attributes.h"
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#include "InfoItem.h"
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#include "Pool.h"
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#include "FastHashTable.h"
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#include "StringPool.h"
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#include "FileReader.h"
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class ClassFileReader;
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class FileReader;
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class AttributeHandler;
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class AttributeHandlerCode;
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/* Class access flags */
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#define CR_ACC_PUBLIC 0x0001
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#define CR_ACC_FINAL 0x0010
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#define CR_ACC_SUPER 0x0020
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#define CR_ACC_INTERFACE 0x0200
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#define CR_ACC_ABSTRACT 0x0400
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struct InfoNode {
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const char *sig; /* descriptor for field/method */
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Int32 index; /* Index into field/method table */
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InfoNode(const char *sig, Int32 index) : sig(sig), index(index) { }
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};
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/* Reads and parses a class file */
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class ClassFileReader {
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public:
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ClassFileReader(Pool &p, StringPool &sp, FileReader &fr);
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Uint16 getMinorVersion() const {
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return minorVersion;
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}
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Uint16 getMajorVersion() const {
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return majorVersion;
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}
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Uint16 getAccessFlags() const {
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return accessFlags;
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}
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/* returns a pointer to the class/interface described by the class file */
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ConstantClass *getThisClass() const {
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return (ConstantClass *) constantPool->get(thisClassIndex);
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}
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/* returns an index into the constant pool rather than a pointer to
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* the class itself
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*/
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Uint16 getThisClassIndex() const {
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return thisClassIndex;
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}
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/* returns a pointer to the super-class or nil if there is none */
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ConstantClass *getSuperClass() const {
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return (superClassIndex > 0) ? (ConstantClass *)
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constantPool->get(superClassIndex) : 0;
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}
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/* returns an index into the constant pool table that points to the
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* superclass; index is zero if there is no superclass
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*/
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Uint16 getSuperClassIndex() const {
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return superClassIndex;
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}
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/* Constant pool table */
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const ConstantPool *getConstantPool() const {
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return (const ConstantPool *) constantPool;
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}
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Uint16 getConstantPoolCount() const {
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return (constantPool) ? (Uint16) constantPool->count() : 0;
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}
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/* Interface table */
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const ConstantPool *getInterfaceInfo() const {
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return (const ConstantPool *) interfaceInfo;
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}
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Uint16 getInterfaceCount() const {
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return (interfaceInfo) ? (Uint16) interfaceInfo->count() : 0;
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}
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/* Return an array of all fields in the class. */
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const FieldInfo **getFieldInfo() const {
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return (const FieldInfo **) fieldInfo;
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}
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/* return total number of fields in the field table of the class. */
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Uint16 getFieldCount() const {
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return fieldCount;
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}
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/* Return an array pointing to the public fields of the class.
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* array[i] is an index into the fields array of the class, and points
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* to a FieldInfo structure.
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*/
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const Uint16 *getPublicFields() const {
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return (const Uint16 *) publicFields;
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}
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/* return number of public fields in the class */
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Uint16 getPublicFieldCount() const {
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return publicFieldCount;
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}
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/* return an array of all methods in the class */
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const MethodInfo **getMethodInfo() const {
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return (const MethodInfo **) methodInfo;
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}
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/* return total number of methods in the method table of the class */
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Uint16 getMethodCount() const {
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return methodCount;
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}
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/* Return an array of the public methods of the class. This does not
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* include <init> and <clinit> methods. array[i] is an index into the
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* methods array of the class, and points to a MethodInfo structure
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* located at that index.
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*/
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const Uint16 *getPublicMethods() const {
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return (const Uint16 *) publicMethods;
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}
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/* return number of public methods in the class. */
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Uint16 getPublicMethodCount() const {
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return publicMethodCount;
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}
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/* Return an array of the declared methods of the class. This does not
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* include <init> and <clinit> methods. array[i] is an index into the
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* methods array of the class, and points to a MethodInfo structure
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* located at that index.
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*/
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const Uint16 *getDeclaredMethods() const {
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return (const Uint16 *) declaredMethods;
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}
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/* return number of declared methods in the class. */
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Uint16 getDeclaredMethodCount() const {
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return declaredMethodCount;
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}
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/* return an array of constructors of the class. Constructors are
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* methods with the special name <init>. array[i] is an index into the
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* methods array of the class, and points to a MethodInfo structure
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* located at that index.
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*/
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const Uint16 *getConstructors() const {
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return (const Uint16 *) constructors;
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}
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/* return total number of constructors in the class. */
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Uint16 getConstructorCount() const {
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return constructorCount;
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}
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/* return an array consisting of the public constructors of the class.
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* array[i] is an index into the
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* methods array of the class, and points to a MethodInfo structure
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* located at that index.
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*/
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const Uint16 *getPublicConstructors() const {
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return (const Uint16 *) publicConstructors;
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}
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/* return total number of public constructors in the class */
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Uint16 getPublicConstructorCount() const {
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return publicConstructorCount;
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}
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/* Attribute table */
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const AttributeInfoItem **getAttributeInfo() const {
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return (const AttributeInfoItem **) attributeInfo;
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}
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Uint16 getAttributeCount() const {
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return attributeCount;
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}
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/* Look up a constant of type integer, long, float, or double whose
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* offset in the constant pool of the class is index. Returns true on success,
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* false if it couldn't find the field or on error.
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*/
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bool lookupConstant(Uint16 index, ValueKind &vk, Value &value) const;
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/* look up a fieldref, methodref or interfacemethodref with the
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* given name and signature, and return the index in the field/method
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* array of the class that the field/method/interface method occupies.
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* returns true on success, false on failure.
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*/
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bool lookupConstant(const char *name, const char *sig,
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Uint8 type, Uint16 &index) const;
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/* Look up a field based on given name and type descriptor. On success,
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* returns the FieldInfo for the field; on failure, returns NULL
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*/
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const FieldInfo *lookupField(const char *name, const char *type,
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Uint16 &index) const {
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return static_cast<const FieldInfo *>
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(lookupFieldOrMethod(CR_CONSTANT_FIELDREF, name, type, index));
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}
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/* Look up a method based on given name and signature. On success,
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* returns the MethodInfo for the field; on failure, returns NULL.
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* sig can be nil if the method is not overloaded.
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*/
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const MethodInfo *lookupMethod(const char *name, const char *sig,
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Uint16 &index) const {
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return static_cast<const MethodInfo *>
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(lookupFieldOrMethod(CR_CONSTANT_METHODREF, name, sig, index));
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}
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/* Look up a field or method based on given name and type descriptor.
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* On success, returns the InfoItem for the field or method; on failure,
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* returns NULL. type can be either CR_CONSTANT_FIELDREF (look for a field)
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* or CR_CONSTANT_METHODREF (look for a method). Assumption: both name
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* and sig are interned strings. On success, index is set to the
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* index of the matched field or method in the field or method table
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* of the class.
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*/
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const InfoItem *lookupFieldOrMethod(Uint8 type, const char *name,
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const char *sig, Uint16 &index) const;
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#ifdef DEBUG
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void dump() const;
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#endif
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private:
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/* Copies of data read from the class file */
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Uint16 minorVersion, majorVersion;
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Uint16 accessFlags;
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Uint16 thisClassIndex, superClassIndex;
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/* Array of constantpoolCount constant pool items */
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ConstantPool *constantPool;
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/* Array of interfaceCount interface references */
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ConstantPool *interfaceInfo;
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/* Array of fieldCount fields */
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FieldInfo **fieldInfo;
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Uint16 fieldCount;
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/* Array of attributeCount global attributes */
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AttributeInfoItem **attributeInfo;
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Uint16 attributeCount;
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/* Array of methodCount methods */
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MethodInfo **methodInfo;
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Uint16 methodCount;
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/* Array of publicFieldCount public fields. publicFields[i] is an
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* index into the field array (fieldInfo)
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*/
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Uint16 *publicFields;
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Uint16 publicFieldCount;
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/* Array of publicMethodCount public methods. publicMethods[i] is an
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* index into the method array (methodInfo)
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*/
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Uint16 *publicMethods;
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Uint16 publicMethodCount;
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/* Array of declaredMethodCount declared methods. declaredMethods[i] is an
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* index into the method array (methodInfo). A declared method is a public,
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* protected or private method that is not <init> or <clinit>.
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*/
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Uint16 *declaredMethods;
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Uint16 declaredMethodCount;
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/* Array of constructorCount constructors. constructors[i] is an
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* index into the method array (methodInfo)
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*/
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Uint16 *constructors;
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Uint16 constructorCount;
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/* Array of publicConstructorCount public constructors.
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* publicConstructors[i] is an index into the method array (methodInfo)
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*/
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Uint16 *publicConstructors;
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Uint16 publicConstructorCount;
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/* Array of numAttrHandlers handler functions that handle attributes that
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* we know about
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*/
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AttributeHandler **attrHandlers;
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int numAttrHandlers;
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/* Physical size of the attrHandlers array */
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int attrSize;
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/* Pool used to allocate dynamic structures */
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Pool &p;
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/* Pool that holds interned strings */
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StringPool &sp;
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/* Class that reads from the class file */
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FileReader &fr;
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/* Hashtables for fast lookups for fields and methods, indexed by the
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* name of the field/method
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*/
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FastHashTable<InfoNode *> fieldTable, methodTable;
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/* Reads and parses the constant pool section of the class file */
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void readConstantPool();
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/* Reads and parses the interface section of the class file */
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void readInterfaces();
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/* Reads and parses the method section of the class file */
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void readMethods();
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public:
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void readAttributes(AttributeInfoItem **attrInfo,
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Uint32 attrCount);
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private:
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void readFields();
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void readInfoItems(Uint32 count, InfoItem **info, bool field);
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/* Read one attribute from the current position in the file */
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AttributeInfoItem *readAttribute();
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void addAttrHandler(AttributeHandler *handler);
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bool invalidIndex(Uint32 index) {
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return (index < 1 || index >= constantPool->count());
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}
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};
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#endif /* _ClassFileReader_H_ */
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