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PojavLauncherTeam
GitHub Repository: PojavLauncherTeam/openj9
 Path: blob/master/runtime/bcutil/ComparingCursor.hpp
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/*******************************************************************************

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 * Copyright (c) 2001, 2019 IBM Corp. and others

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 *

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 * This program and the accompanying materials are made available under

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 * the terms of the Eclipse Public License 2.0 which accompanies this

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 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/

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 * or the Apache License, Version 2.0 which accompanies this distribution and

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 * is available at https://www.apache.org/licenses/LICENSE-2.0.

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 *

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 * This Source Code may also be made available under the following

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 * Secondary Licenses when the conditions for such availability set

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 * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU

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 * General Public License, version 2 with the GNU Classpath

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 * Exception [1] and GNU General Public License, version 2 with the

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 * OpenJDK Assembly Exception [2].

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 *

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 * [1] https://www.gnu.org/software/classpath/license.html

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 * [2] http://openjdk.java.net/legal/assembly-exception.html

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 *

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 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception

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 *******************************************************************************/

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/*

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 * ComparingCursor.hpp

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 */

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#ifndef COMPARINGCURSOR_HPP_

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#define COMPARINGCURSOR_HPP_

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/* @ddr_namespace: default */

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#include "Cursor.hpp"

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#include "ComparingCursorHelper.hpp"

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class SRPKeyProducer;

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class ClassFileOracle;

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class ComparingCursor : public Cursor

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{

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public:

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	ComparingCursor(J9JavaVM *javaVM, SRPOffsetTable *srpOffsetTable, SRPKeyProducer *srpKeyProducer,

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		ClassFileOracle *classFileOracle, U_8 *romClass, bool romClassIsShared, ROMClassCreationContext * context, bool isComparingLambdaFromSCC);

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	~ComparingCursor();

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	UDATA getCount();

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	void writeU8(U_8 u8Value, DataType dataType);

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	void writeU16(U_16 u16Value, DataType dataType);

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	void writeU32(U_32 u32Value, DataType dataType);

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	void writeU64(U_32 u32ValueHigh, U_32 u32ValueLow, DataType dataType);

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	void writeData(U_8* bytes, UDATA length, DataType dataType);

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	void padToAlignment(UDATA byteAlignment, DataType dataType);

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	void writeSRP(UDATA srpKey, DataType dataType);

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	void writeWSRP(UDATA srpKey, DataType dataType);

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	void mark(UDATA srpKey) { /* do nothing */ }

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	void notifyDebugDataWriteStart();

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	void notifyVariableTableWriteEnd();

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	void notifyDebugDataWriteEnd() { _context->endDebugCompare(); }

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	U_32 peekU32(DataType dataType);

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	void skip(UDATA byteCount, DataType dataType = Cursor::GENERIC);

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	bool isEqual() const { return _isEqual; }

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	bool isComparingLambdaFromSCC() const { return _isComparingLambdaFromSCC; }

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private:

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	J9JavaVM *_javaVM;

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	bool _checkRangeInSharedCache;

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	ClassFileOracle *_classFileOracle;

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	SRPKeyProducer *_srpKeyProducer;

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	U_8 *_romClass;

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	Cursor::Mode _mode;

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	U_8 * _storePointerToVariableInfo;

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	U_8 * _basePointerToVariableInfo;

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	ComparingCursorHelper _mainHelper;

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	ComparingCursorHelper _lineNumberHelper;

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	ComparingCursorHelper _varInfoHelper;

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	bool _isEqual;

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	bool _isComparingLambdaFromSCC;

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	void markUnEqual() { _isEqual = false; }

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	bool isRangeValidForPtr(U_8 *ptr, UDATA length);

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	UDATA getMaximumValidLengthForPtrInSegment(U_8 *ptr);

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	/*Helper verification methods*/

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	bool shouldCheckForEquality(DataType dataType, U_32 u32Value = 0);

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	bool isRangeValid(UDATA length, DataType dataType);

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	bool isRangeValidForUTF8Ptr(J9UTF8 *utf8);

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	/*Methods to get the correct helper (aka counter) for compare*/

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	ComparingCursorHelper * getCountingCursor(DataType dataType);

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};

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#endif /* COMPARINGCURSOR_HPP_ */

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