/* ###
 * IP: GHIDRA
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package ghidra.program.flatapi;

import static ghidra.app.plugin.core.clear.ClearOptions.ClearType.*;

import java.io.*;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.stream.Collectors;

import ghidra.app.cmd.comments.SetCommentCmd;
import ghidra.app.cmd.disassemble.DisassembleCommand;
import ghidra.app.cmd.function.CreateFunctionCmd;
import ghidra.app.cmd.function.DeleteFunctionCmd;
import ghidra.app.cmd.label.DeleteLabelCmd;
import ghidra.app.cmd.label.SetLabelPrimaryCmd;
import ghidra.app.plugin.core.analysis.AutoAnalysisManager;
import ghidra.app.plugin.core.clear.ClearCmd;
import ghidra.app.plugin.core.clear.ClearOptions;
import ghidra.app.script.GhidraScript;
import ghidra.features.base.memsearch.bytesource.AddressableByteSource;
import ghidra.features.base.memsearch.bytesource.ProgramByteSource;
import ghidra.features.base.memsearch.gui.SearchSettings;
import ghidra.features.base.memsearch.matcher.*;
import ghidra.features.base.memsearch.searcher.MemoryMatch;
import ghidra.features.base.memsearch.searcher.MemorySearcher;
import ghidra.framework.main.AppInfo;
import ghidra.framework.model.*;
import ghidra.framework.plugintool.PluginTool;
import ghidra.program.model.address.*;
import ghidra.program.model.data.*;
import ghidra.program.model.lang.CompilerSpec;
import ghidra.program.model.lang.Language;
import ghidra.program.model.listing.*;
import ghidra.program.model.mem.*;
import ghidra.program.model.scalar.Scalar;
import ghidra.program.model.symbol.*;
import ghidra.program.model.util.CodeUnitInsertionException;
import ghidra.program.util.AddressEvaluator;
import ghidra.program.util.string.*;
import ghidra.util.ascii.AsciiCharSetRecognizer;
import ghidra.util.datastruct.ListAccumulator;
import ghidra.util.exception.*;
import ghidra.util.task.TaskMonitor;

/**
 * This class is a flattened version of the Program API.
 * <p>
 * NOTE:
 * <ol>
 * 	<li>NO METHODS *SHOULD* EVER BE REMOVED FROM THIS CLASS.</li>
 * 	<li>NO METHOD SIGNATURES *SHOULD* EVER BE CHANGED IN THIS CLASS.</li>
 * </ol>
 * <p>
 * This class is used by GhidraScript.
 * <p>
 * Changing this class will break user scripts.
 */
public class FlatProgramAPI {
	public static final int MAX_REFERENCES_TO = 0x1000;

	protected Program currentProgram;
	protected TaskMonitor monitor;

	private int transactionID = -1;

	/**
	 * Constructs a new flat program API.
	 * It will not be usable until the 'set' method has been called.
	 */
	protected FlatProgramAPI() {
		// empty
	}

	/**
	 * Constructs a new flat program API.
	 * @param program the program
	 */
	public FlatProgramAPI(Program program) {
		this(program, TaskMonitor.DUMMY);
	}

	/**
	 * Constructs a new flat program API.
	 * @param program the program
	 * @param monitor the task monitor
	 */
	public FlatProgramAPI(Program program, TaskMonitor monitor) {
		this.currentProgram = program;
		this.monitor = monitor;
		// ensure that auto-analysis manager has been activated for program
		AutoAnalysisManager.getAnalysisManager(program);
	}

	/**
	 * Sets the current state.
	 * @param program the program
	 * @param monitor the task monitor
	 */
	protected void set(Program program, TaskMonitor monitor) {
		this.currentProgram = program;
		this.monitor = monitor;
	}

	/**
	 * Gets the current program.
	 * @return the program
	 */
	public Program getCurrentProgram() {
		return currentProgram;
	}

	/**
	 * Gets the current task monitor.
	 * @return the task monitor
	 */
	public TaskMonitor getMonitor() {
		return monitor;
	}

	/**
	 * Starts a transaction on the current program.
	 */
	public final void start() {
		if (currentProgram == null) {
			return;
		}
		if (transactionID == -1) {
			transactionID = currentProgram.startTransaction(getClass().getName());
		}
	}

	/**
	 * Ends the transactions on the current program.
	 * @param commit true if changes should be committed
	 */
	public final void end(boolean commit) {
		if (currentProgram == null) {
			return;
		}
		if (transactionID != -1) {
			currentProgram.endTransaction(transactionID, commit);
			transactionID = -1;
		}
	}

	/**
	 * Returns the {@link File} that the program was originally imported from.  It does not 
	 * necessarily still exist on the file system.
	 * <p>
	 * For example, <code>c:\temp\test.exe</code>.
	 * @return the {@link File} that the program was originally imported from
	 */
	public final File getProgramFile() {
		return new File(currentProgram.getExecutablePath());
	}

	/**
	 * Start disassembling at the specified address.
	 * The disassembler will follow code flows.
	 * @param address the address to begin disassembling
	 * @return true if the program was successfully disassembled
	 */
	public final boolean disassemble(Address address) {
		DisassembleCommand cmd = new DisassembleCommand(address, null, true);
		return cmd.applyTo(currentProgram, monitor);
	}

	/**
	 * Starts auto-analysis on the specified program and performs complete analysis
	 * of the entire program.  This is usually only necessary if full analysis was never
	 * performed. This method will block until analysis completes.
	 * @param program the program to analyze
	 * @deprecated the method {@link #analyzeAll} or {@link #analyzeChanges} should be invoked.
	 * These separate methods were created to clarify their true behavior since many times it is
	 * only necessary to analyze changes and not the entire program which can take much
	 * longer and affect more of the program than is necessary.
	 */
	@Deprecated(since = "7.4", forRemoval = true)
	public void analyze(Program program) {
		analyzeAll(program);
	}

	/**
	 * Starts auto-analysis on the specified program and performs complete analysis
	 * of the entire program.  This is usually only necessary if full analysis was never
	 * performed. This method will block until analysis completes.
	 * @param program the program to analyze
	 */
	public void analyzeAll(Program program) {

		AutoAnalysisManager mgr = AutoAnalysisManager.getAnalysisManager(program);

		mgr.initializeOptions();
		mgr.reAnalyzeAll(null);

		analyzeChanges(program);
	}

	/**
	 * Starts auto-analysis if not started and waits for pending analysis to complete.
	 * Only pending analysis on program changes is performed, including changes resulting
	 * from any analysis activity.  This method will block until analysis completes.
	 * NOTE: The auto-analysis manager will only detect program changes once it has been
	 * instantiated for a program (i.e, AutoAnalysisManager.getAnalysisManager(program) ).
	 * This is automatically done for the initial currentProgram, however, if a script is
	 * opening/instantiating its own programs it may be necessary to do this prior to
	 * making changes to the program.
	 * @param program the program to analyze
	 */
	public void analyzeChanges(Program program) {

		AutoAnalysisManager mgr = AutoAnalysisManager.getAnalysisManager(program);

		// analysis will start immediately in background if GUI analysis tool exists
		// and script is not running as analysis worker in background

		PluginTool analysisTool = mgr.getAnalysisTool();
		if (analysisTool == null || analysisTool.threadIsBackgroundTaskThread()) {
			mgr.startAnalysis(monitor, true); // yields to analysis
		}
		else {
			mgr.waitForAnalysis(null, monitor); // waits for all analaysis to complete
		}
	}

	/**
	 * Clears the code unit (instruction or data) defined at the address.
	 * @param address the address to clear the code unit
	 * @throws CancelledException if cancelled
	 */
	public final void clearListing(Address address) throws CancelledException {
		clearListing(address, address);
	}

	/**
	 * Clears the code units (instructions or data) in the specified range.
	 * @param start the start address
	 * @param end   the end address (INCLUSIVE)
	 * @throws CancelledException if cancelled
	 */
	public final void clearListing(Address start, Address end) throws CancelledException {
		currentProgram.getListing().clearCodeUnits(start, end, false, monitor);
	}

	/**
	 * Clears the code units (instructions or data) in the specified set
	 * @param set the set to clear
	 * @throws CancelledException if cancelled
	 */
	public final void clearListing(AddressSetView set) throws CancelledException {
		AddressRangeIterator iter = set.getAddressRanges();
		while (iter.hasNext()) {
			if (monitor.isCancelled()) {
				break;
			}
			AddressRange range = iter.next();
			clearListing(range.getMinAddress(), range.getMaxAddress());
		}
	}

	/**
	 * Clears the listing in the specified address set.
	 * @param set  the address set where to clear
	 * @param code true if code units should be cleared (instructions and defined data)
	 * @param symbols true if symbols should be cleared
	 * @param comments true if comments should be cleared
	 * @param properties true if properties should be cleared
	 * @param functions true if functions should be cleared
	 * @param registers true if registers should be cleared
	 * @param equates true if equates should be cleared
	 * @param userReferences true if user references should be cleared
	 * @param analysisReferences true if analysis references should be cleared
	 * @param importReferences true if import references should be cleared
	 * @param defaultReferences true if default references should be cleared
	 * @param bookmarks true if bookmarks should be cleared
	 * @return true if the address set was successfully cleared
	 */
	public final boolean clearListing(AddressSetView set, boolean code, boolean symbols,
			boolean comments, boolean properties, boolean functions, boolean registers,
			boolean equates, boolean userReferences, boolean analysisReferences,
			boolean importReferences, boolean defaultReferences, boolean bookmarks) {

		return this.clearListing(set, code, code, symbols, comments, properties, functions,
			registers, equates, userReferences, analysisReferences, importReferences,
			defaultReferences, bookmarks);
	}

	/**
	 * Clears the listing in the specified address set.
	 * @param set  the address set where to clear
	 * @param instructions true if instructions should be cleared
	 * @param data true if defined data should be cleared
	 * @param symbols true if symbols should be cleared
	 * @param comments true if comments should be cleared
	 * @param properties true if properties should be cleared
	 * @param functions true if functions should be cleared
	 * @param registers true if registers should be cleared
	 * @param equates true if equates should be cleared
	 * @param userReferences true if user references should be cleared
	 * @param analysisReferences true if analysis references should be cleared
	 * @param importReferences true if import references should be cleared
	 * @param defaultReferences true if default references should be cleared
	 * @param bookmarks true if bookmarks should be cleared
	 * @return true if the address set was successfully cleared
	 */
	public final boolean clearListing(AddressSetView set, boolean instructions, boolean data,
			boolean symbols, boolean comments, boolean properties, boolean functions,
			boolean registers, boolean equates, boolean userReferences, boolean analysisReferences,
			boolean importReferences, boolean defaultReferences, boolean bookmarks) {

		ClearOptions options = new ClearOptions();
		options.setShouldClear(INSTRUCTIONS, instructions);
		options.setShouldClear(DATA, data);
		options.setShouldClear(SYMBOLS, symbols);
		options.setShouldClear(COMMENTS, comments);
		options.setShouldClear(PROPERTIES, properties);
		options.setShouldClear(FUNCTIONS, functions);
		options.setShouldClear(REGISTERS, registers);
		options.setShouldClear(EQUATES, equates);
		options.setShouldClear(USER_REFERENCES, userReferences);
		options.setShouldClear(ANALYSIS_REFERENCES, analysisReferences);
		options.setShouldClear(IMPORT_REFERENCES, importReferences);
		options.setShouldClear(DEFAULT_REFERENCES, defaultReferences);
		options.setShouldClear(BOOKMARKS, bookmarks);

		ClearCmd cmd = new ClearCmd(set, options);
		return cmd.applyTo(currentProgram, monitor);
	}

	/**
	 * Create a new memory block.
	 * If the input stream is null, then an uninitialized block will be created.
	 * @param name    the name of the block
	 * @param start   start address of the block
	 * @param input   source of the data used to fill the block.
	 * @param length  the size of the block
	 * @param overlay true will create an overlay, false will not
	 * @return the newly created memory block
	 * @throws Exception if there is any exception
	 */
	public final MemoryBlock createMemoryBlock(String name, Address start, InputStream input,
			long length, boolean overlay) throws Exception {
		if (input == null) {
			return currentProgram.getMemory()
					.createUninitializedBlock(name, start, length, overlay);
		}
		return currentProgram.getMemory()
				.createInitializedBlock(name, start, input, length, monitor, overlay);
	}

	/**
	 * Create a new memory block.
	 * @param name the name of the block
	 * @param start   start address of the block
	 * @param bytes   the bytes of the memory block
	 * @param overlay true will create an overlay, false will not
	 * @return the newly created memory block
	 * @throws Exception if there is any exception
	 */
	public final MemoryBlock createMemoryBlock(String name, Address start, byte[] bytes,
			boolean overlay) throws Exception {
		ByteArrayInputStream input = new ByteArrayInputStream(bytes);
		return currentProgram.getMemory()
				.createInitializedBlock(name, start, input, bytes.length, monitor, overlay);
	}

	/**
	 * Returns the first memory block with the specified name.
	 * NOTE: if more than block exists with the same name, the first
	 * block with that name will be returned.
	 * @param name the name of the requested block
	 * @return the memory block with the specified name
	 */
	public final MemoryBlock getMemoryBlock(String name) {
		return currentProgram.getMemory().getBlock(name);
	}

	/**
	 * Returns the memory block containing the specified address,
	 * or null if no memory block contains the address.
	 * @param address the address
	 * @return the memory block containing the specified address
	 */
	public final MemoryBlock getMemoryBlock(Address address) {
		return currentProgram.getMemory().getBlock(address);
	}

	/**
	 * Returns an array containing all the memory blocks
	 * in the current program.
	 * @return an array containing all the memory blocks
	 */
	public final MemoryBlock[] getMemoryBlocks() {
		return currentProgram.getMemory().getBlocks();
	}

	/**
	 * Remove the memory block.
	 * NOTE: ALL ANNOTATION (disassembly, comments, etc) defined in this
	 * memory block will also be removed!
	 * @param block the block to be removed
	 * @throws Exception if there is any exception
	 */
	public final void removeMemoryBlock(MemoryBlock block) throws Exception {
		currentProgram.getMemory().removeBlock(block, monitor);
	}

	/**
	 * Creates a label at the specified address in the global namespace.
	 * If makePrimary==true, then the new label is made primary.
	 * @param address the address to create the symbol
	 * @param name the name of the symbol
	 * @param makePrimary true if the symbol should be made primary
	 * @return the newly created code or function symbol
	 * @throws Exception if there is any exception
	 */
	public final Symbol createLabel(Address address, String name, boolean makePrimary)
			throws Exception {
		return createLabel(address, name, makePrimary, SourceType.USER_DEFINED);
	}

	/**
	 * Creates a label at the specified address in the global namespace.
	 * If makePrimary==true, then the new label is made primary.
	 * @param address the address to create the symbol
	 * @param name the name of the symbol
	 * @param makePrimary true if the symbol should be made primary
	 * @return the newly created code or function symbol
	 * @throws Exception if there is any exception
	 * @deprecated use {@link #createLabel(Address, String, boolean)} instead.
	 */
	@Deprecated(since = "7.4", forRemoval = true)
	public final Symbol createSymbol(Address address, String name, boolean makePrimary)
			throws Exception {
		return createLabel(address, name, makePrimary);
	}

	/**
	 * Creates a label at the specified address in the global namespace.
	 * If makePrimary==true, then the new label is made primary.
	 * If makeUnique==true, then if the name is a duplicate, the address
	 * will be concatenated to name to make it unique.
	 * @param address the address to create the symbol
	 * @param name the name of the symbol
	 * @param makePrimary true if the symbol should be made primary
	 * @param sourceType the source type.
	 * @return the newly created code or function symbol
	 * @throws Exception if there is any exception
	 */
	public final Symbol createLabel(Address address, String name, boolean makePrimary,
			SourceType sourceType) throws Exception {
		return createLabel(address, name, null, makePrimary, sourceType);
	}

	/**
	 * Creates a label at the specified address in the specified namespace.
	 * If makePrimary==true, then the new label is made primary if permitted.
	 * If makeUnique==true, then if the name is a duplicate, the address
	 * will be concatenated to name to make it unique.
	 * @param address the address to create the symbol
	 * @param name the name of the symbol
	 * @param namespace label's parent namespace
	 * @param makePrimary true if the symbol should be made primary
	 * @param sourceType the source type.
	 * @return the newly created code or function symbol
	 * @throws Exception if there is any exception
	 */
	public final Symbol createLabel(Address address, String name, Namespace namespace,
			boolean makePrimary, SourceType sourceType) throws Exception {
		SymbolTable symbolTable = currentProgram.getSymbolTable();
		Symbol symbol = symbolTable.createLabel(address, name, namespace, sourceType);
		if (makePrimary && !symbol.isPrimary()) {
			SetLabelPrimaryCmd cmd = new SetLabelPrimaryCmd(address, name, namespace);
			if (cmd.applyTo(currentProgram)) {
				symbol = cmd.getSymbol();
			}
		}
		return symbol;
	}

	/**
	 * Creates a label at the specified address in the global namespace.
	 * If makePrimary==true, then the new label is made primary.
	 * If makeUnique==true, then if the name is a duplicate, the address
	 * will be concatenated to name to make it unique.
	 * @param address the address to create the symbol
	 * @param name the name of the symbol
	 * @param makePrimary true if the symbol should be made primary
	 * @param makeUnique ignored
	 * @param sourceType the source type.
	 * @return the newly created code or function symbol
	 * @throws Exception if there is any exception
	 * @deprecated use {@link #createLabel(Address, String, boolean, SourceType)} instead
	 */
	@Deprecated(since = "7.4", forRemoval = true)
	public final Symbol createSymbol(Address address, String name, boolean makePrimary,
			boolean makeUnique, SourceType sourceType) throws Exception {
		return createLabel(address, name, makePrimary, sourceType);
	}

	/**
	 * Adds an entry point at the specified address.
	 * @param address address to create entry point
	 */
	public final void addEntryPoint(Address address) {
		currentProgram.getSymbolTable().addExternalEntryPoint(address);
	}

	/**
	 * Removes the entry point at the specified address.
	 * @param address address of entry point to remove
	 */
	public final void removeEntryPoint(Address address) {
		currentProgram.getSymbolTable().removeExternalEntryPoint(address);
	}

	/**
	 * Deletes the symbol with the specified name at the specified address.
	 * @param address the address of the symbol to delete
	 * @param name the name of the symbol to delete
	 * @return true if the symbol was deleted
	 */
	public final boolean removeSymbol(Address address, String name) {
		DeleteLabelCmd cmd = new DeleteLabelCmd(address, name);
		return cmd.applyTo(currentProgram);
	}

	/**
	 * Sets a PLATE comment at the specified address
	 * @param address the address to set the PLATE comment
	 * @param comment the PLATE comment
	 * @return true if the PLATE comment was successfully set
	 */
	public final boolean setPlateComment(Address address, String comment) {
		SetCommentCmd cmd = new SetCommentCmd(address, CommentType.PLATE, comment);
		return cmd.applyTo(currentProgram);
	}

	/**
	 * Sets a PRE comment at the specified address
	 * @param address the address to set the PRE comment
	 * @param comment the PRE comment
	 * @return true if the PRE comment was successfully set
	 */
	public final boolean setPreComment(Address address, String comment) {
		SetCommentCmd cmd = new SetCommentCmd(address, CommentType.PRE, comment);
		return cmd.applyTo(currentProgram);
	}

	/**
	 * Sets a POST comment at the specified address
	 * @param address the address to set the POST comment
	 * @param comment the POST comment
	 * @return true if the POST comment was successfully set
	 */
	public final boolean setPostComment(Address address, String comment) {
		SetCommentCmd cmd = new SetCommentCmd(address, CommentType.POST, comment);
		return cmd.applyTo(currentProgram);
	}

	/**
	 * Sets an EOL comment at the specified address
	 * @param address the address to set the EOL comment
	 * @param comment the EOL comment
	 * @return true if the EOL comment was successfully set
	 */
	public final boolean setEOLComment(Address address, String comment) {
		SetCommentCmd cmd = new SetCommentCmd(address, CommentType.EOL, comment);
		return cmd.applyTo(currentProgram);
	}

	/**
	 * Sets a repeatable comment at the specified address
	 * @param address the address to set the repeatable comment
	 * @param comment the repeatable comment
	 * @return true if the repeatable comment was successfully set
	 */
	public final boolean setRepeatableComment(Address address, String comment) {
		SetCommentCmd cmd = new SetCommentCmd(address, CommentType.REPEATABLE, comment);
		return cmd.applyTo(currentProgram);
	}

	/**
	 * Returns the PLATE comment at the specified address.  The comment returned is the raw text
	 * of the comment.  Contrastingly, calling {@link GhidraScript#getPlateCommentAsRendered(Address)} will
	 * return the text of the comment as it is rendered in the display.
	 *
	 * @param address the address to get the comment
	 * @return the PLATE comment at the specified address or null
	 * if one does not exist
	 * @see GhidraScript#getPlateCommentAsRendered(Address)
	 */
	public final String getPlateComment(Address address) {
		return currentProgram.getListing().getComment(CommentType.PLATE, address);
	}

	/**
	 * Returns the PRE comment at the specified address.  The comment returned is the raw text
	 * of the comment.  Contrastingly, calling {@link GhidraScript#getPreCommentAsRendered(Address)} will
	 * return the text of the comment as it is rendered in the display.
	 *
	 * @param address the address to get the comment
	 * @return the PRE comment at the specified address or null
	 * if one does not exist
	 * @see GhidraScript#getPreCommentAsRendered(Address)
	 */
	public final String getPreComment(Address address) {
		return currentProgram.getListing().getComment(CommentType.PRE, address);
	}

	/**
	 * Returns the POST comment at the specified address.  The comment returned is the raw text
	 * of the comment.  Contrastingly, calling {@link GhidraScript#getPostCommentAsRendered(Address)} will
	 * return the text of the comment as it is rendered in the display.
	 *
	 * @param address the address to get the comment
	 * @return the POST comment at the specified address or null
	 * if one does not exist
	 * @see GhidraScript#getPostCommentAsRendered(Address)
	 */
	public final String getPostComment(Address address) {
		return currentProgram.getListing().getComment(CommentType.POST, address);
	}

	/**
	 * Returns the EOL comment at the specified address.  The comment returned is the raw text
	 * of the comment.  Contrastingly, calling {@link GhidraScript#getEOLCommentAsRendered(Address)} will
	 * return the text of the comment as it is rendered in the display.
	 * @param address the address to get the comment
	 * @return the EOL comment at the specified address or null
	 * if one does not exist
	 * @see GhidraScript#getEOLCommentAsRendered(Address)
	 */
	public final String getEOLComment(Address address) {
		return currentProgram.getListing().getComment(CommentType.EOL, address);
	}

	/**
	 * Returns the repeatable comment at the specified address.  The comment returned is the raw text
	 * of the comment.  Contrastingly, calling {@link GhidraScript#getRepeatableCommentAsRendered(Address)} will
	 * return the text of the comment as it is rendered in the display.
	 * @param address the address to get the comment
	 * @return the repeatable comment at the specified address or null
	 * if one does not exist
	 * @see GhidraScript#getRepeatableCommentAsRendered(Address)
	 */
	public final String getRepeatableComment(Address address) {
		return currentProgram.getListing().getComment(CommentType.REPEATABLE, address);
	}

	/**
	 * Finds the first occurrence of the byte
	 * starting from the address. If the start address
	 * is null, then the find will start from the minimum address
	 * of the program.
	 * @param start the address to start searching
	 * @param value the byte to search for
	 * @return the first address where the byte was found
	 */
	public final Address find(Address start, byte value) {
		return find(start, new byte[] { value });
	}

	/**
	 * Finds the first occurrence of the byte array sequence
	 * starting from the address. If the start address
	 * is null, then the find will start from the minimum address
	 * of the program.
	 * @param start the address to start searching
	 * @param values the byte array sequence to search for
	 * @return the first address where the byte was found, or
	 * null if the bytes were not found
	 */
	public final Address find(Address start, byte[] values) {
		if (start == null) {
			start = currentProgram.getMinAddress();
		}
		return currentProgram.getMemory().findBytes(start, values, null, true, monitor);
	}

	/**
	 * Finds the first occurrence of the byte array sequence that matches the given byte regex,
	 * starting from the address. If the start address is null, then the find will start
	 * from the minimum address of the program.
	 * <p>
	 * The {@code byteRegex} may contain special regular expression characters that need to be
	 * escaped accordingly.  The following highlights some example search strings (note the use of 
	 * double backslashes ("\\")):
	 * <pre>
	 *             "\\x80" - A basic search pattern for a byte value of 0x80
	 * "\\x50.{0,10}\\x55" - A regular expression string that searches for the byte 0x50
	 *                       followed by 0-10 occurrences of any byte value, followed
	 *                       by the byte 0x55
	 * </pre>
	 *
	 * @param start the address to start searching.  If null, then the start of the program
	 *        will be used.
	 * @param byteRegex the byte pattern regex for which to search
	 * @return the first address where the byte was found, or null if the bytes were not found
	 * @throws IllegalArgumentException if {@code byteRegex} is not a valid regular expression
	 * @see #findBytes(Address, String, int)
	 */
	public final Address findBytes(Address start, String byteRegex) {
		Address[] matchingAddresses = findBytes(start, byteRegex, 1);
		if (matchingAddresses.length == 0) {
			return null;
		}
		return matchingAddresses[0];
	}

	/**
	 * Finds the first {@code <matchLimit>} occurrences of the byte array sequence that matches
	 * the given byte regex, starting from the address. If the start address is null, then the
	 * find will start from the minimum address of the program.
	 * <p>
	 * The {@code byteRegex} may contain special regular expression characters that need to be
	 * escaped accordingly.  The following highlights some example search strings (note the use of 
	 * double backslashes ("\\")):
	 * <pre>
	 *             "\\x80" - A basic search pattern for a byte value of 0x80
	 * "\\x50.{0,10}\\x55" - A regular expression string that searches for the byte 0x50
	 *                       followed by 0-10 occurrences of any byte value, followed
	 *                       by the byte 0x55
	 * </pre>
	 *
	 * @param start the address to start searching.  If null, then the start of the program
	 *        will be used.
	 * @param byteRegex the byte pattern regex for which to search
	 * @param matchLimit The number of matches to which the search should be restricted
	 * @return the start addresses that contain byte patterns that match the given byte regex
	 * @throws IllegalArgumentException if {@code byteRegex} is not a valid regular expression
	 * @see #findBytes(Address, String)
	 */
	public final Address[] findBytes(Address start, String byteRegex, int matchLimit) {
		return findBytes(start, byteRegex, matchLimit, 1);
	}

	/**
	 * Finds the first {@code <matchLimit>} occurrences of the byte array sequence that matches
	 * the given byte regex, starting from the address. If the start address is null, then the
	 * find will start from the minimum address of the program.
	 * <p>
	 * The {@code byteRegex} may contain special regular expression characters that need to be
	 * escaped accordingly.  The following highlights some example search strings (note the use of 
	 * double backslashes ("\\")):
	 * <pre>
	 *             "\\x80" - A basic search pattern for a byte value of 0x80
	 * "\\x50.{0,10}\\x55" - A regular expression string that searches for the byte 0x50
	 *                       followed by 0-10 occurrences of any byte value, followed
	 *                       by the byte 0x55
	 * </pre>
	 *
	 * @param start the address to start searching.  If null, then the start of the program
	 *        will be used.
	 * @param byteRegex the byte regex pattern for which to search
	 * @param matchLimit The number of matches to which the search should be restricted
	 * @param alignment byte alignment to use for search starts. For example, a value of
	 *    1 searches from every byte.  A value of 2 only matches runs that begin on a even
	 *    address boundary.
	 * @return the start addresses that contain byte patterns that match the given byte regex
	 * @throws IllegalArgumentException if {@code byteRegex} is not a valid regular expression
	 * @see #findBytes(Address, String)
	 */
	public final Address[] findBytes(Address start, String byteRegex, int matchLimit,
			int alignment) {

		if (start == null) {
			start = currentProgram.getMinAddress();
		}

		if (matchLimit <= 0) {
			matchLimit = 500;
		}

		Memory memory = currentProgram.getMemory();
		AddressFactory factory = currentProgram.getAddressFactory();
		AddressSet addressRange = factory.getAddressSet(start, memory.getMaxAddress());

		Address[] bytes = findBytes(addressRange, byteRegex, matchLimit, alignment, false);
		return bytes;
	}

	/**
	 * Finds a byte regex pattern within an addressSet.
	 *
	 * Note: The ranges within the addressSet are NOT treated as a contiguous set when searching
	 * <p>
	 * The {@code byteRegex} may contain special regular expression characters that need to be
	 * escaped accordingly.  The following highlights some example search strings (note the use of 
	 * double backslashes ("\\")):
	 * <pre>
	 *             "\\x80" - A basic search pattern for a byte value of 0x80
	 * "\\x50.{0,10}\\x55" - A regular expression string that searches for the byte 0x50
	 *                       followed by 0-10 occurrences of any byte value, followed
	 *                       by the byte 0x55
	 * </pre>
	 *
	 * @param set the addressSet specifying which addresses to search.
	 * @param byteRegex the byte regex pattern for which to search
	 * @param matchLimit The number of matches to which the search should be restricted
	 * @param alignment byte alignment to use for search starts. For example, a value of
	 *    1 searches from every byte.  A value of 2 only matches runs that begin on a even
	 *    address boundary.
	 * @return the start addresses that contain byte patterns that match the given byteString
	 * @throws IllegalArgumentException if {@code byteRegex} is not a valid regular expression
	 * @see #findBytes(Address, String)
	 */
	public final Address[] findBytes(AddressSetView set, String byteRegex, int matchLimit,
			int alignment) {

		if (matchLimit <= 0) {
			matchLimit = 500;
		}

		SearchSettings settings = new SearchSettings().withAlignment(alignment);
		ByteMatcher<SearchData> matcher = new RegExByteMatcher(byteRegex, settings);
		AddressableByteSource byteSource = new ProgramByteSource(currentProgram);
		Memory memory = currentProgram.getMemory();
		AddressSet intersection = memory.getLoadedAndInitializedAddressSet().intersect(set);

		MemorySearcher<SearchData> searcher =
			new MemorySearcher<>(byteSource, matcher, intersection, matchLimit);
		ListAccumulator<MemoryMatch<SearchData>> accumulator = new ListAccumulator<>();
		searcher.findAll(accumulator, monitor);

		//@formatter:off
		List<Address> addresses =
			accumulator.stream()
                       .map(r -> r.getAddress())
                       .collect(Collectors.toList());
		//@formatter:on
		return addresses.toArray(new Address[addresses.size()]);
	}

	/**
	 * This method has been deprecated, use {@link #findBytes(Address, String, int, int)} instead.
	 * The concept of searching and finding matches that span gaps (address ranges where no memory
	 * blocks have been defined), is no longer supported. If this capability has value to anyone, 
	 * please contact the Ghidra team and let us know.
	 * <P>
	 * Finds a byte regex pattern within an addressSet.
	 *
	 * Note: The ranges within the addressSet are NOT treated as a contiguous set when searching
	 * <p>
	 * The {@code byteRegex} may contain special regular expression characters that need to be
	 * escaped accordingly.  The following highlights some example search strings (note the use of 
	 * double backslashes ("\\")):
	 * <pre>
	 *             "\\x80" - A basic search pattern for a byte value of 0x80
	 * "\\x50.{0,10}\\x55" - A regular expression string that searches for the byte 0x50
	 *                       followed by 0-10 occurrences of any byte value, followed
	 *                       by the byte 0x55
	 * </pre>
	 *
	 * @param set the addressSet specifying which addresses to search.
	 * @param byteRegex the byte regex pattern for which to search
	 * @param matchLimit The number of matches to which the search should be restricted
	 * @param alignment byte alignment to use for search starts. For example, a value of
	 *    1 searches from every byte.  A value of 2 only matches runs that begin on a even
	 *    address boundary.
	 * @param searchAcrossAddressGaps This parameter is no longer supported and its value is
	 * ignored. Previously, if true, match results were allowed to span non-continguous memory
	 * ranges. 
	 * @return the start addresses that contain byte patterns that match the given byte regex
	 * @throws IllegalArgumentException if {@code byteRegex} is not a valid regular expression
	 * @see #findBytes(Address, String)
	 * 
	 * @deprecated see description for details.
	 */
	@Deprecated(since = "11.3", forRemoval = true)
	public final Address[] findBytes(AddressSetView set, String byteRegex, int matchLimit,
			int alignment, boolean searchAcrossAddressGaps) {
		return findBytes(set, byteRegex, matchLimit, alignment);
	}

	/**
	 * Finds the first occurrence of 'text' in the program listing.
	 * The search order is defined as:
	 * <ol>
	 * <li>PLATE comments</li>
	 * <li>PRE comments</li>
	 * <li>labels</li>
	 * <li>code unit mnemonics and operands</li>
	 * <li>EOL comments</li>
	 * <li>repeatable comments</li>
	 * <li>POST comments</li>
	 * </ol>
	 * @param text the text to search for
	 * @return the first address where the 'text' was found, or null
	 *  if the text was not found
	 */
	public final Address find(String text) {
		Address addr = null;

		monitor.setMessage("Searching plate comments...");
		addr = findComment(CommentType.PLATE, text);
		if (addr != null) {
			return addr;
		}

		monitor.setMessage("Searching pre comments...");
		addr = findComment(CommentType.PRE, text);
		if (addr != null) {
			return addr;
		}

		monitor.setMessage("Searching labels...");
		SymbolIterator symiter = currentProgram.getSymbolTable().getAllSymbols(true);
		while (symiter.hasNext() && !monitor.isCancelled()) {
			Symbol sym = symiter.next();
			if (currentProgram.getMemory().contains(sym.getAddress())) {
				if (sym.getName().indexOf(text) >= 0) {
					return sym.getAddress();
				}
			}
		}

		monitor.setMessage("Searching code units...");
		CodeUnitIterator cuIter = currentProgram.getListing().getCodeUnits(true);
		while (cuIter.hasNext() && !monitor.isCancelled()) {
			CodeUnit cu = cuIter.next();
			if (cu.getMnemonicString().indexOf(text) >= 0) {
				return cu.getMinAddress();
			}
			if (cu instanceof Instruction) {
				Instruction instr = (Instruction) cu;
				int nOps = instr.getNumOperands();
				for (int i = 0; i < nOps; ++i) {
					Object[] objs = instr.getOpObjects(i);
					for (Object element : objs) {
						String str = element.toString();
						if (str != null && str.indexOf(text) >= 0) {
							return instr.getMinAddress();
						}
					}
				}
			}
			if (cu instanceof Data) {
				Data data = (Data) cu;
				Object obj = data.getValue();
				if (obj != null) {
					String str = obj.toString();
					if (str != null && str.indexOf(text) >= 0) {
						return data.getMinAddress();
					}
				}
			}
		}

		monitor.setMessage("Searching eol comments...");
		addr = findComment(CommentType.EOL, text);
		if (addr != null) {
			return addr;
		}

		monitor.setMessage("Searching repeatable comments...");
		addr = findComment(CommentType.REPEATABLE, text);
		if (addr != null) {
			return addr;
		}

		monitor.setMessage("Searching post comments...");
		addr = findComment(CommentType.POST, text);
		if (addr != null) {
			return addr;
		}

		return null;
	}

	/**
	 * Search for sequences of Ascii strings in program memory.  See {@link AsciiCharSetRecognizer}
	 * to see exactly what chars are considered ASCII for purposes of this search.
	 * @param addressSet The address set to search. Use null to search all memory;
	 * @param minimumStringLength The smallest number of chars in a sequence to be considered a
	 * "string".
	 * @param alignment specifies any alignment requirements for the start of the string.  An
	 * alignment of 1, means the string can start at any address.  An alignment of 2 means the
	 * string must start on an even address and so on.  Only allowed values are 1,2, and 4.
	 * @param requireNullTermination If true, only strings that end in a null will be returned.
	 * @param includeAllCharWidths if true, UTF16 and UTF32 size strings will be included in
	 * addition to UTF8.
	 * @return a list of "FoundString" objects which contain the addresses, length, and type of
	 * possible strings.
	 */
	public List<FoundString> findStrings(AddressSetView addressSet, int minimumStringLength,
			int alignment, boolean requireNullTermination, boolean includeAllCharWidths) {

		final List<FoundString> list = new ArrayList<>();
		FoundStringCallback foundStringCallback = foundString -> list.add(foundString);

		StringSearcher searcher = new StringSearcher(currentProgram, minimumStringLength, alignment,
			includeAllCharWidths, requireNullTermination);

		searcher.search(addressSet, foundStringCallback, true, monitor);

		return list;
	}

	/**
	 * Search for sequences of Pascal Ascii strings in program memory.  See
	 * {@link AsciiCharSetRecognizer} to see exactly what chars are considered ASCII for purposes
	 * of this search.
	 * @param addressSet The address set to search. Use null to search all memory;
	 * @param minimumStringLength The smallest number of chars in a sequence to be considered a
	 * "string".
	 * @param alignment specifies any alignment requirements for the start of the string.  An
	 * alignment of 1, means the string can start at any address.  An alignment of 2 means the
	 * string must start on an even address and so on.  Only allowed values are 1,2, and 4.
	 * @param includePascalUnicode if true, UTF16 size strings will be included in addition to UTF8.
	 * @return a list of "FoundString" objects which contain the addresses, length, and type of
	 * possible strings.
	 */
	public List<FoundString> findPascalStrings(AddressSetView addressSet, int minimumStringLength,
			int alignment, boolean includePascalUnicode) {
		final List<FoundString> list = new ArrayList<>();
		FoundStringCallback foundStringCallback = foundString -> list.add(foundString);

		PascalStringSearcher searcher = new PascalStringSearcher(currentProgram,
			minimumStringLength, alignment, includePascalUnicode);

		searcher.search(addressSet, foundStringCallback, true, monitor);

		return list;
	}

	/**
	 * Creates a function at entry point with the specified name
	 * @param entryPoint the entry point of the function
	 * @param name the name of the function or null for a default function
	 * @return the new function or null if the function was not created
	 */
	public final Function createFunction(Address entryPoint, String name) {
		CreateFunctionCmd cmd = new CreateFunctionCmd(name, entryPoint, null,
			name != null ? SourceType.USER_DEFINED : SourceType.DEFAULT);
		if (cmd.applyTo(currentProgram, monitor)) {
			return currentProgram.getListing().getFunctionAt(entryPoint);
		}
		return null;
	}

	/**
	 * Removes the function from the current program.
	 * @param function the function to remove
	 */
	public final void removeFunction(Function function) {
		removeFunctionAt(function.getEntryPoint());
	}

	/**
	 * Removes the function with the given entry point.
	 * @param entryPoint the entry point of the function to remove
	 */
	public final void removeFunctionAt(Address entryPoint) {
		DeleteFunctionCmd cmd = new DeleteFunctionCmd(entryPoint);
		cmd.applyTo(currentProgram);
	}

	/**
	 * Returns the function with the specified entry point, or
	 * null if no function exists.
	 * @param entryPoint the function entry point address
	 * @return the function with the specified entry point, or
	 * null if no function exists
	 */
	public final Function getFunctionAt(Address entryPoint) {
		return currentProgram.getListing().getFunctionAt(entryPoint);
	}

	/**
	 * Returns the function containing the specified address.
	 * @param address the address
	 * @return the function containing the specified address
	 */
	public final Function getFunctionContaining(Address address) {
		return currentProgram.getListing().getFunctionContaining(address);
	}

	/**
	 * Returns the function defined before the specified function in address order.
	 * @param function the function
	 * @return the function defined before the specified function
	 */
	public final Function getFunctionBefore(Function function) {
		if (function == null) {
			return null;
		}
		Address start = function.getEntryPoint();
		return getFunctionBefore(start);
	}

	/**
	 * Returns the function defined before the specified address.
	 * @param address the address
	 * @return the function defined before the specified address
	 */
	public final Function getFunctionBefore(Address address) {
		FunctionIterator iterator = currentProgram.getListing().getFunctions(address, false);
		// skip over this function.
		// This is weird, but if you have multiple overlay spaces or address spaces,
		// you WILL miss functions by not using the iterator and doing address math yourself.
		if (!iterator.hasNext()) {
			return null;
		}
		Function func = iterator.next();
		// if the function found starts at the start address, go to the next one.
		if (address.equals(func.getEntryPoint())) {
			func = null;
			if (iterator.hasNext()) {
				func = iterator.next();
			}
		}

		return func;
	}

	/**
	 * Returns the function defined after the specified function in address order.
	 * @param function the function
	 * @return the function defined after the specified function
	 */
	public final Function getFunctionAfter(Function function) {
		if (function == null) {
			return null;
		}

		Address start = function.getEntryPoint();

		return getFunctionAfter(start);
	}

	/**
	 * Returns the function defined after the specified address.
	 * @param address the address
	 * @return the function defined after the specified address
	 */
	public final Function getFunctionAfter(Address address) {
		FunctionIterator iterator = currentProgram.getListing().getFunctions(address, true);
		// skip over this function.
		// This is weird, but if you have multiple overlay spaces or address spaces,
		// you WILL miss functions by not using the iterator and doing address math yourself.
		if (!iterator.hasNext()) {
			return null;
		}
		Function func = iterator.next();
		// if the function found starts at the start address, go to the next one.
		if (address.equals(func.getEntryPoint())) {
			func = null;
			if (iterator.hasNext()) {
				func = iterator.next();
			}
		}

		return func;
	}

	/**
	 * Returns the function with the specified name, or
	 * null if no function exists. (Now returns the first one it finds with that name)
	 * @param name the name of the function
	 * @return the function with the specified name, or
	 * null if no function exists
	 * @deprecated this method makes no sense in the new world order where function  names
	 * 			   no longer have to be unique. Use {@link #getGlobalFunctions(String)}
	 * 			   Deprecated in Ghidra 7.4
	 */
	@Deprecated(since = "7.4", forRemoval = true)
	public final Function getFunction(String name) {
		List<Function> globalFunctions = currentProgram.getListing().getGlobalFunctions(name);
		return globalFunctions.isEmpty() ? null : globalFunctions.get(0);
	}

	/**
	 * Returns a list of all functions in the global namespace with the given name.
	 * @param name the name of the function
	 * @return the function with the specified name, or
	 */
	public final List<Function> getGlobalFunctions(String name) {
		return currentProgram.getListing().getGlobalFunctions(name);
	}

	/**
	 * Returns the first function in the current program.
	 * @return the first function in the current program
	 */
	public final Function getFirstFunction() {
		FunctionIterator iterator = currentProgram.getListing().getFunctions(true);
		if (iterator.hasNext()) {
			return iterator.next();
		}
		return null;
	}

	/**
	 * Returns the last function in the current program.
	 * @return the last function in the current program
	 */
	public final Function getLastFunction() {
		FunctionIterator iterator = currentProgram.getListing().getFunctions(false);
		if (iterator.hasNext()) {
			return iterator.next();
		}
		return null;
	}

	/**
	 * Returns the first instruction in the current program.
	 * @return the first instruction in the current program
	 */
	public final Instruction getFirstInstruction() {
		Address address = currentProgram.getMinAddress();
		InstructionIterator iterator = currentProgram.getListing().getInstructions(address, true);
		if (iterator.hasNext()) {
			return iterator.next();
		}
		return null;
	}

	/**
	 * Returns the first instruction in the function.
	 * @param function the function
	 * @return the first instruction in the function
	 */
	public final Instruction getFirstInstruction(Function function) {
		Address address = function.getEntryPoint();
		return getInstructionAt(address);
	}

	/**
	 * Returns the last instruction in the current program.
	 * @return the last instruction in the current program
	 */
	public final Instruction getLastInstruction() {
		Address address = currentProgram.getMaxAddress();
		InstructionIterator iterator = currentProgram.getListing().getInstructions(address, false);
		if (iterator.hasNext()) {
			return iterator.next();
		}
		return null;
	}

	/**
	 * Returns the instruction at the specified address or null if no instruction exists.
	 * @param address the instruction address
	 * @return the instruction at the specified address or null if no instruction exists
	 */
	public final Instruction getInstructionAt(Address address) {
		return currentProgram.getListing().getInstructionAt(address);
	}

	/**
	 * Returns the instruction containing the specified address or null if no instruction exists.
	 * @param address the instruction address
	 * @return the instruction containing the specified address or null if no instruction exists
	 */
	public final Instruction getInstructionContaining(Address address) {
		return currentProgram.getListing().getInstructionContaining(address);
	}

	/**
	 * Returns the instruction defined before the specified instruction or null
	 * if no instruction exists.
	 * The instruction that is returned does not have to be contiguous.
	 * @param instruction the instruction
	 * @return the instruction defined before the specified instruction or null if no instruction exists
	 */
	public final Instruction getInstructionBefore(Instruction instruction) {
		return getInstructionBefore(instruction.getMinAddress());
	}

	/**
	 * Returns the instruction defined before the specified address or null
	 * if no instruction exists.
	 * The instruction that is returned does not have to be contiguous.
	 * @param address the address of the instruction
	 * @return the instruction defined before the specified address or null if no instruction exists
	 */
	public final Instruction getInstructionBefore(Address address) {
		return currentProgram.getListing().getInstructionBefore(address);
	}

	/**
	 * Returns the instruction defined after the specified instruction or null
	 * if no instruction exists.
	 * The instruction that is returned does not have to be contiguous.
	 * @param instruction the instruction
	 * @return the instruction defined after the specified instruction or null if no instruction exists
	 */
	public final Instruction getInstructionAfter(Instruction instruction) {
		return getInstructionAfter(instruction.getMaxAddress());
	}

	/**
	 * Returns the instruction defined after the specified address or null
	 * if no instruction exists.
	 * The instruction that is returned does not have to be contiguous.
	 * @param address the address of the prior instruction
	 * @return the instruction defined after the specified address or null if no instruction exists
	 */
	public final Instruction getInstructionAfter(Address address) {
		return currentProgram.getListing().getInstructionAfter(address);
	}

	/**
	 * Returns the first defined data in the current program.
	 * @return the first defined data in the current program
	 */
	public final Data getFirstData() {
		Address address = currentProgram.getMinAddress();
		DataIterator iterator = currentProgram.getListing().getData(address, true);
		if (iterator.hasNext()) {
			return iterator.next();
		}
		return null;
	}

	/**
	 * Returns the last defined data in the current program.
	 * @return the last defined data in the current program
	 */
	public final Data getLastData() {
		Address address = currentProgram.getMaxAddress();
		DataIterator iterator = currentProgram.getListing().getData(address, false);
		if (iterator.hasNext()) {
			return iterator.next();
		}
		return null;
	}

	/**
	 * Returns the defined data at the specified address or null if no data exists.
	 * @param address the data address
	 * @return the data at the specified address or null if no data exists
	 */
	public final Data getDataAt(Address address) {
		return currentProgram.getListing().getDefinedDataAt(address);
	}

	/**
	 * Returns the defined data containing the specified address or null if no data exists.
	 * @param address the data address
	 * @return the defined data containing the specified address or null if no data exists
	 */
	public final Data getDataContaining(Address address) {
		return currentProgram.getListing().getDefinedDataContaining(address);
	}

	/**
	 * Returns the defined data before the specified data or null if no data exists.
	 * @param data the succeeding data
	 * @return the defined data before the specified data or null if no data exists
	 */
	public final Data getDataBefore(Data data) {
		return getDataBefore(data.getMinAddress());
	}

	/**
	 * Returns the defined data before the specified address or null if no data exists.
	 * @param address the data address
	 * @return the defined data before the specified address or null if no data exists
	 */
	public final Data getDataBefore(Address address) {
		return currentProgram.getListing().getDefinedDataBefore(address);
	}

	/**
	 * Returns the defined data after the specified data or null if no data exists.
	 * @param data preceding data
	 * @return the defined data after the specified data or null if no data exists
	 */
	public final Data getDataAfter(Data data) {
		return getDataAfter(data.getMaxAddress());
	}

	/**
	 * Returns the defined data after the specified address or null if no data exists.
	 * @param address the data address
	 * @return the defined data after the specified address or null if no data exists
	 */
	public final Data getDataAfter(Address address) {
		return currentProgram.getListing().getDefinedDataAfter(address);
	}

	/**
	 * Returns the undefined data at the specified address or null if no undefined data exists.
	 * @param address the undefined data address
	 * @return the undefined data at the specified address or null if no undefined data exists
	 */
	public final Data getUndefinedDataAt(Address address) {
		return currentProgram.getListing().getUndefinedDataAt(address);
	}

	/**
	 * Returns the undefined data before the specified address or null if no undefined data exists.
	 * @param address the undefined data address
	 * @return the undefined data before the specified address or null if no undefined data exists
	 */
	public final Data getUndefinedDataBefore(Address address) {
		return currentProgram.getListing().getUndefinedDataBefore(address, monitor);
	}

	/**
	 * Returns the undefined data after the specified address or null if no undefined data exists.
	 * @param address the undefined data address
	 * @return the undefined data after the specified address or null if no undefined data exists
	 */
	public final Data getUndefinedDataAfter(Address address) {
		return currentProgram.getListing().getUndefinedDataAfter(address, monitor);
	}

	/**
	 * Returns the symbol with the specified address and name, or
	 * null if no symbol exists.
	 * @param address the symbol address
	 * @param name the symbol name
	 * @return the symbol with the specified address and name, or
	 * null if no symbol exists
	 * @deprecated Since the same label name can be at the same address if in a different namespace,
	 * this method is ambiguous. Use {@link #getSymbolAt(Address, String, Namespace)} instead.
	 */
	@Deprecated(since = "7.4", forRemoval = true)
	public final Symbol getSymbolAt(Address address, String name) {
		SymbolIterator symbols = currentProgram.getSymbolTable().getSymbolsAsIterator(address);
		for (Symbol symbol : symbols) {
			if (symbol.getName().equals(name)) {
				return symbol;
			}
		}
		return null;
	}

	/**
	 * Returns the symbol with the specified address, name, and namespace
	 *
	 * @param address the symbol address
	 * @param name the symbol name
	 * @param namespace the parent namespace for the symbol.
	 * @return the symbol with the specified address, name, and namespace, or
	 * null if no symbol exists
	 */
	public final Symbol getSymbolAt(Address address, String name, Namespace namespace) {
		return currentProgram.getSymbolTable().getSymbol(name, address, namespace);
	}

	/**
	 * Returns the next non-default primary symbol defined
	 * after the given symbol.
	 * @param symbol the symbol to use as a starting point
	 * @return the next non-default primary symbol
	 */
	public final Symbol getSymbolAfter(Symbol symbol) {
		return getSymbolAfter(symbol.getAddress());
	}

	/**
	 * Returns the next non-default primary symbol defined
	 * after the given address.
	 * @param address the address to use as a starting point
	 * @return the next non-default primary symbol
	 */
	public final Symbol getSymbolAfter(Address address) {
		SymbolIterator iterator =
			currentProgram.getSymbolTable().getPrimarySymbolIterator(address.add(1), true);
		if (iterator.hasNext()) {
			return iterator.next();
		}
		return null;
	}

	/**
	 * Returns the previous non-default primary symbol defined
	 * before the given symbol.
	 * @param symbol the symbol to use as a starting point
	 * @return the previous non-default primary symbol
	 */
	public final Symbol getSymbolBefore(Symbol symbol) {
		return getSymbolBefore(symbol.getAddress());
	}

	/**
	 * Returns the previous non-default primary symbol defined
	 * after the previous address.
	 * @param address the address to use as a starting point
	 * @return the next non-default primary symbol
	 */
	public final Symbol getSymbolBefore(Address address) {
		SymbolIterator iterator =
			currentProgram.getSymbolTable().getSymbolIterator(address.subtract(1), false);
		if (iterator.hasNext()) {
			return iterator.next();
		}
		return null;
	}

	/**
	 * Returns the PRIMARY symbol at the specified address, or
	 * null if no symbol exists.
	 * @param address the symbol address
	 * @return the PRIMARY symbol at the specified address, or
	 * null if no symbol exists
	 */
	public final Symbol getSymbolAt(Address address) {
		return currentProgram.getSymbolTable().getPrimarySymbol(address);
	}

	/**
	 * Returns the symbol with the given name in the given namespace if there is only one.
	 * Pass <code>null</code> for namespace to indicate the global namespace.
	 * @param name the name of the symbol
	 * @param namespace the parent namespace, or null for global namespace
	 * @return the symbol with the given name in the given namespace
	 * @throws IllegalStateException if there is more than one symbol with that name.
	 * @deprecated use {@link #getSymbols(String, Namespace)}
	 */
	@Deprecated(since = "7.4", forRemoval = true)
	public final Symbol getSymbol(String name, Namespace namespace) {
		List<Symbol> symbols = currentProgram.getSymbolTable().getSymbols(name, namespace);
		if (symbols.size() == 1) {
			return symbols.get(0);
		}
		else if (symbols.size() > 1) {
			throw new IllegalStateException(
				"There are multiple symbols named " + name + " in namespace " + namespace);
		}
		return null;
	}

	/**
	 * Returns a list of all the symbols with the given name in the given namespace.
	 * @param name the name of the symbols to retrieve.
	 * @param namespace the namespace containing the symbols, or null for the global namespace.
	 * @return a list of all the symbols with the given name in the given namespace.
	 */
	public final List<Symbol> getSymbols(String name, Namespace namespace) {
		return currentProgram.getSymbolTable().getSymbols(name, namespace);
	}

	/**
	 * Returns the non-function namespace with the given name contained inside the
	 * specified parent namespace.
	 * Pass <code>null</code> for parent to indicate the global namespace.
	 * @param parent the parent namespace, or null for global namespace
	 * @param namespaceName the requested namespace's name
	 * @return the namespace with the given name or null if not found
	 */
	public final Namespace getNamespace(Namespace parent, String namespaceName) {
		return currentProgram.getSymbolTable().getNamespace(namespaceName, parent);
	}

	/**
		 * Creates a new {@link Namespace} with the given name contained inside the
		 * specified parent namespace.
		 * Pass <code>null</code> for parent to indicate the global namespace.
		 * If a {@link Namespace} or {@link GhidraClass} with the given name already exists, the
		 * existing one will be returned.
		 * @param parent the parent namespace, or null for global namespace
		 * @param namespaceName the requested namespace's name
		 * @return the namespace with the given name
		 * @throws DuplicateNameException if a {@link Library} symbol exists with the given name
		 * @throws InvalidInputException if the name is invalid
		 * @throws IllegalArgumentException if parent Namespace does not correspond to
		 * <code>currerntProgram</code>
		 */
	public final Namespace createNamespace(Namespace parent, String namespaceName)
			throws DuplicateNameException, InvalidInputException {
		SymbolTable symbolTable = currentProgram.getSymbolTable();
		Namespace ns = symbolTable.getNamespace(namespaceName, parent);
		if (ns != null) {
			SymbolType type = ns.getSymbol().getSymbolType();
			if (type == SymbolType.NAMESPACE || type == SymbolType.CLASS) {
				return ns;
			}
		}
		return symbolTable.createNameSpace(parent, namespaceName, SourceType.USER_DEFINED);
	}

	/**
	 * Creates a new {@link GhidraClass} with the given name contained inside the
	 * specified parent namespace.
	 * Pass <code>null</code> for parent to indicate the global namespace.
	 * If a GhidraClass with the given name already exists, the existing one will be returned.
	 * @param parent the parent namespace, or null for global namespace
	 * @param className the requested classes name
	 * @return the GhidraClass with the given name
	 * @throws InvalidInputException if the name is invalid
	 * @throws DuplicateNameException thrown if a {@link Library} or {@link Namespace}
	 * symbol already exists with the given name.
	 * Use {@link SymbolTable#convertNamespaceToClass(Namespace)} for converting an
	 * existing Namespace to a GhidraClass.
	 * @throws IllegalArgumentException if the given parent namespace is not from
	 * the {@link #currentProgram}.
	 * @throws ConcurrentModificationException if the given parent has been deleted
	 * @throws IllegalArgumentException if parent Namespace does not correspond to
	 * <code>currerntProgram</code>
	 * @see SymbolTable#convertNamespaceToClass(Namespace)
	 */
	public final GhidraClass createClass(Namespace parent, String className)
			throws DuplicateNameException, InvalidInputException {
		SymbolTable symbolTable = currentProgram.getSymbolTable();
		Namespace ns = symbolTable.getNamespace(className, parent);
		if (ns != null) {
			SymbolType type = ns.getSymbol().getSymbolType();
			if (type == SymbolType.CLASS) {
				return (GhidraClass) ns;
			}
		}
		return symbolTable.createClass(parent, className, SourceType.USER_DEFINED);
	}

	/**
	 * Creates a fragment in the root folder of the default program tree.
	 * @param fragmentName the name of the fragment
	 * @param start the start address
	 * @param end the end address (NOT INCLUSIVE)
	 * @return the newly created fragment
	 * @throws DuplicateNameException if the given fragment name already exists
	 * @throws NotFoundException if any address in the fragment would be outside of the program
	 * @deprecated This method is deprecated because it did not allow you to include the
	 * largest possible address.  Instead use the one that takes a start address and a length.
	 */
	@Deprecated(since = "7.4", forRemoval = true)
	public final ProgramFragment createFragment(String fragmentName, Address start, Address end)
			throws DuplicateNameException, NotFoundException {
		ProgramModule module = currentProgram.getListing().getDefaultRootModule();
		return createFragment(module, fragmentName, start, end);
	}

	/**
	 * Creates a fragment in the root folder of the default program tree.
	 * @param fragmentName the name of the fragment
	 * @param start the start address
	 * @param length the length of the fragment
	 * @return the newly created fragment
	 * @throws DuplicateNameException if the given fragment name already exists
	 * @throws NotFoundException if any address in the fragment would be outside of the program
	 */
	public final ProgramFragment createFragment(String fragmentName, Address start, long length)
			throws DuplicateNameException, NotFoundException {
		ProgramModule module = currentProgram.getListing().getDefaultRootModule();
		return createFragment(module, fragmentName, start, length);
	}

	/**
	 * Creates a fragment in the given folder of the default program tree.
	 * @param module the parent module (or folder)
	 * @param fragmentName the name of the fragment
	 * @param start the start address
	 * @param end the end address (NOT INCLUSIVE)
	 * @return the newly created fragment
	 * @throws DuplicateNameException if the given fragment name already exists
	 * @throws NotFoundException if any address in the fragment would be outside of the program
	 * @deprecated This method is deprecated because it did not allow you to include the
	 * largest possible address.  Instead use the one that takes a start address and a length.
	 */
	@Deprecated(since = "7.4", forRemoval = true)
	public final ProgramFragment createFragment(ProgramModule module, String fragmentName,
			Address start, Address end) throws DuplicateNameException, NotFoundException {
		ProgramFragment fragment = getFragment(module, fragmentName);
		if (fragment == null) {
			fragment = module.createFragment(fragmentName);
		}
		fragment.move(start, end.subtract(1));
		return fragment;
	}

	/**
	 * Creates a fragment in the given folder of the default program tree.
	 * @param module the parent module (or folder)
	 * @param fragmentName the name of the fragment
	 * @param start the start address
	 * @param length the length of the fragment
	 * @return the newly created fragment
	 * @throws DuplicateNameException if the given fragment name already exists
	 * @throws NotFoundException if any address in the fragment would be outside of the program
	 */
	public final ProgramFragment createFragment(ProgramModule module, String fragmentName,
			Address start, long length) throws DuplicateNameException, NotFoundException {
		ProgramFragment fragment = getFragment(module, fragmentName);
		if (fragment == null) {
			fragment = module.createFragment(fragmentName);
		}
		fragment.move(start, start.add(length - 1));
		return fragment;
	}

	/**
	 * Returns the fragment with the specified name
	 * defined in the given module.
	 * @param module the parent module
	 * @param fragmentName the fragment name
	 * @return the fragment or null if one does not exist
	 */
	public final ProgramFragment getFragment(ProgramModule module, String fragmentName) {
		Group[] groups = module.getChildren();
		for (Group group : groups) {
			if (group.getName().equals(fragmentName)) {
				return (ProgramFragment) group;
			}
		}
		return null;
	}

	/**
	 * Creates a new mutable address set.
	 * @return a new mutable address set
	 */
	public final AddressSet createAddressSet() {
		return new AddressSet();
	}

	public final AddressFactory getAddressFactory() {
		if (currentProgram != null) {
			return currentProgram.getAddressFactory();
		}
		return null;
	}

	/**
	 * Searches through the datatype manager of the current program and
	 * returns an array of datatypes that match the specified name.
	 * The datatype manager supports datatypes of the same name in different categories.
	 * A zero-length array indicates that no datatypes with the specified name exist.
	 * @param name the name of the desired datatype
	 * @return an array of datatypes that match the specified name
	 */
	public final DataType[] getDataTypes(String name) {
		ArrayList<DataType> list = new ArrayList<>();
		currentProgram.getDataTypeManager().findDataTypes(name, list);
		DataType[] dtarr = new DataType[list.size()];
		list.toArray(dtarr);
		return dtarr;
	}

	/**
	 * Creates a new defined Data object at the given address.
	 * @param address the address at which to create a new Data object.
	 * @param datatype the Data Type that describes the type of Data object to create.
	 * @return the newly created Data object
	 * @throws CodeUnitInsertionException if a conflicting code unit already exists
	 */
	public final Data createData(Address address, DataType datatype)
			throws CodeUnitInsertionException {
		Listing listing = currentProgram.getListing();
		Data d = listing.getDefinedDataAt(address);
		if (d != null) {
			if (d.getDataType().isEquivalent(datatype)) {
				return d;
			}
			throw new CodeUnitInsertionException("Data conflict at address " + address);
		}
		return listing.createData(address, datatype);
	}

	/**
	 * Creates a byte datatype at the given address.
	 * @param address the address to create the byte
	 * @return the newly created Data object
	 * @throws Exception if there is any exception
	 */
	public final Data createByte(Address address) throws Exception {
		return createData(address, new ByteDataType());
	}

	/**
	 * Creates a word datatype at the given address.
	 * @param address the address to create the word
	 * @return the newly created Data object
	 * @throws Exception if there is any exception
	 */
	public final Data createWord(Address address) throws Exception {
		return createData(address, new WordDataType());
	}

	/**
	 * Creates a dword datatype at the given address.
	 * @param address the address to create the dword
	 * @return the newly created Data object
	 * @throws Exception if there is any exception
	 */
	public final Data createDWord(Address address) throws Exception {
		return createData(address, new DWordDataType());
	}

	/**
	 * Creates a list of dword datatypes starting at the given address.
	 * @param start the start address to create the dwords
	 * @param count the number of dwords to create
	 * @throws Exception if there is any exception
	 */
	public final void createDwords(Address start, int count) throws Exception {
		for (int i = 0; i < count; ++i) {
			Address address = start.add(i * DWordDataType.dataType.getLength());
			createDWord(address);
		}
	}

	/**
	 * Creates a qword datatype at the given address.
	 * @param address the address to create the qword
	 * @return the newly created Data object
	 * @throws Exception if there is any exception
	 */
	public final Data createQWord(Address address) throws Exception {
		return createData(address, new QWordDataType());
	}

	/**
	 * Creates a float datatype at the given address.
	 * @param address the address to create the float
	 * @return the newly created Data object
	 * @throws Exception if there is any exception
	 */
	public final Data createFloat(Address address) throws Exception {
		return createData(address, new FloatDataType());
	}

	/**
	 * Creates a double datatype at the given address.
	 * @param address the address to create the double
	 * @return the newly created Data object
	 * @throws Exception if there is any exception
	 */
	public final Data createDouble(Address address) throws Exception {
		return createData(address, new DoubleDataType());
	}

	/**
	 * Creates a char datatype at the given address.
	 * @param address the address to create the char
	 * @return the newly created Data object
	 * @throws Exception if there is any exception
	 */
	public final Data createChar(Address address) throws Exception {
		return createData(address, new CharDataType());
	}

	/**
	 * Creates a null terminated ascii string starting
	 * at the specified address.
	 * @param address the address to create the string
	 * @return the newly created Data object
	 * @throws Exception if there is any exception
	 */
	public final Data createAsciiString(Address address) throws Exception {
		return createData(address, new TerminatedStringDataType());
	}

	/**
	 * Create an ASCII string at the specified address.
	 * @param address the address
	 * @param length length of string (a value of 0 or negative will force use
	 * of dynamic null terminated string)
	 * @return string data created
	 * @throws CodeUnitInsertionException if there is a data conflict
	 */
	public final Data createAsciiString(Address address, int length)
			throws CodeUnitInsertionException {
		Listing listing = currentProgram.getListing();
		DataType dt = StringDataType.dataType;
		if (length <= 0) {
			dt = TerminatedStringDataType.dataType;
			length = -1;
		}
		Data d = listing.getDefinedDataAt(address);
		if (d != null) {
			if (d.getDataType().isEquivalent(dt) || (length > 0 && length != d.getLength())) {
				throw new CodeUnitInsertionException("Data conflict at address " + address);
			}
		}
		else {
			d = listing.createData(address, dt, length);
		}
		return d;
	}

	/**
	 * Creates a null terminated unicode string starting at the specified address.
	 * @param address the address to create the string
	 * @return the newly created Data object
	 * @throws Exception if there is any exception
	 */
	public final Data createUnicodeString(Address address) throws Exception {
		return createData(address, new TerminatedUnicodeDataType());
	}

	/**
	 * Removes the given data from the current program.
	 * @param data the data to remove
	 * @throws Exception if there is any exception
	 */
	public final void removeData(Data data) throws Exception {
		clearListing(data.getMinAddress(), data.getMaxAddress());
	}

	/**
	 * Removes the data containing the given address from the current program.
	 * @param address the address to remove data
	 * @throws Exception if there is any exception
	 */
	public final void removeDataAt(Address address) throws Exception {
		Data data = getDataContaining(address);
		if (data != null) {
			removeData(data);
		}
	}

	/**
	 * Removes the given instruction from the current program.
	 * @param instruction the instruction to remove
	 * @throws Exception if there is any exception
	 */
	public final void removeInstruction(Instruction instruction) throws Exception {
		clearListing(instruction.getMinAddress(), instruction.getMaxAddress());
	}

	/**
	 * Removes the instruction containing the given address from the current program.
	 * @param address the address to remove instruction
	 * @throws Exception if there is any exception
	 */
	public final void removeInstructionAt(Address address) throws Exception {
		Instruction instruction = getInstructionContaining(address);
		if (instruction != null) {
			removeInstruction(instruction);
		}
	}

	/**
	 * Adds a cross reference (XREF).
	 * @param from     the source address of the reference
	 * @param to       the destination address of the reference
	 * @param opIndex  the operand index (-1 indicates the mnemonic)
	 * @param type     the flow type
	 * @return the newly created reference
	 * @see ghidra.program.model.symbol.FlowType
	 * @see ghidra.program.model.symbol.Reference
	 */
	public final Reference addInstructionXref(Address from, Address to, int opIndex,
			FlowType type) {
		return currentProgram.getReferenceManager()
				.addMemoryReference(from, to, type, SourceType.USER_DEFINED, opIndex);
	}

	/**
	 * Returns a new address with the specified offset in the default address space.
	 * @param offset the offset for the new address
	 * @return a new address with the specified offset in the default address space
	 */
	public final Address toAddr(int offset) {
		return toAddr(Integer.toUnsignedLong(offset));
	}

	/**
	 * Returns a new address with the specified offset in the default address space.
	 * @param offset the offset for the new address
	 * @return a new address with the specified offset in the default address space
	 */
	public final Address toAddr(long offset) {
		return currentProgram.getAddressFactory().getDefaultAddressSpace().getAddress(offset);
	}

	/**
	 * Returns a new address inside the specified program as indicated by the string.
	 * @param addressString string representation of the address desired
	 * @return the address. Otherwise, return null if the string fails to evaluate
	 * to a legitimate address
	 */
	public final Address toAddr(String addressString) {
		return AddressEvaluator.evaluate(currentProgram, addressString);
	}

	/**
	 * Returns the signed 'byte' value at the specified address in memory.
	 * @param address the address
	 * @return the signed 'byte' value at the specified address in memory
	 * @throws MemoryAccessException if the memory is not readable
	 */
	public final byte getByte(Address address) throws MemoryAccessException {
		return currentProgram.getMemory().getByte(address);
	}

	/**
	 * Reads length number of signed bytes starting at the specified address.
	 * Note: this could be inefficient if length is large
	 * @param address the address to start reading
	 * @param length the number of bytes to read
	 * @return an array of signed bytes
	 * @throws MemoryAccessException if memory does not exist or is uninitialized
	 * @see ghidra.program.model.mem.Memory
	 */
	public final byte[] getBytes(Address address, int length) throws MemoryAccessException {
		byte[] bytes = new byte[length];
		currentProgram.getMemory().getBytes(address, bytes);
		return bytes;
	}

	/**
	 * Sets the 'byte' value at the specified address.
	 * @param address the address to set the 'byte'
	 * @param value the value to set
	 * @throws MemoryAccessException if memory does not exist or is uninitialized
	 */
	public final void setByte(Address address, byte value) throws MemoryAccessException {
		currentProgram.getMemory().setByte(address, value);
	}

	/**
	 * Sets the 'byte' values starting at the specified address.
	 * @param address the address to set the bytes
	 * @param values the values to set
	 * @throws MemoryAccessException if memory does not exist or is uninitialized
	 */
	public final void setBytes(Address address, byte[] values) throws MemoryAccessException {
		currentProgram.getMemory().setBytes(address, values);
	}

	/**
	 * Returns the 'short' value at the specified address in memory.
	 * @param address the address
	 * @return the 'short' value at the specified address in memory
	 * @throws MemoryAccessException if the memory is not readable
	 */
	public final short getShort(Address address) throws MemoryAccessException {
		return currentProgram.getMemory().getShort(address);
	}

	/**
	 * Sets the 'short' value at the specified address.
	 * @param address the address to set the 'short'
	 * @param value the value to set
	 * @throws MemoryAccessException if memory does not exist or is uninitialized
	 */
	public final void setShort(Address address, short value) throws MemoryAccessException {
		currentProgram.getMemory().setShort(address, value);
	}

	/**
	 * Returns the 'integer' value at the specified address in memory.
	 * @param address the address
	 * @return the 'integer' value at the specified address in memory
	 * @throws MemoryAccessException if the memory is not readable
	 */
	public final int getInt(Address address) throws MemoryAccessException {
		return currentProgram.getMemory().getInt(address);
	}

	/**
	 * Sets the 'integer' value at the specified address.
	 * @param address the address to set the 'integer'
	 * @param value the value to set
	 * @throws MemoryAccessException if memory does not exist or is uninitialized
	 */
	public final void setInt(Address address, int value) throws MemoryAccessException {
		currentProgram.getMemory().setInt(address, value);
	}

	/**
	 * Returns the 'long' value at the specified address in memory.
	 * @param address the address
	 * @return the 'long' value at the specified address in memory
	 * @throws MemoryAccessException if the memory is not readable
	 */
	public final long getLong(Address address) throws MemoryAccessException {
		return currentProgram.getMemory().getLong(address);
	}

	/**
	 * Sets the 'long' value at the specified address.
	 * @param address the address to set the 'long'
	 * @param value the value to set
	 * @throws MemoryAccessException if memory does not exist or is uninitialized
	 */
	public final void setLong(Address address, long value) throws MemoryAccessException {
		currentProgram.getMemory().setLong(address, value);
	}

	/**
	 * Returns the 'float' value at the specified address in memory.
	 * @param address the address
	 * @return the 'float' value at the specified address in memory
	 * @throws MemoryAccessException if the memory is not readable
	 */
	public final float getFloat(Address address) throws MemoryAccessException {
		int bits = currentProgram.getMemory().getInt(address);
		return Float.intBitsToFloat(bits);
	}

	/**
	 * Sets the 'float' value at the specified address.
	 * @param address the address to set the 'float'
	 * @param value the value to set
	 * @throws MemoryAccessException if memory does not exist or is uninitialized
	 */
	public final void setFloat(Address address, float value) throws MemoryAccessException {
		int bits = Float.floatToIntBits(value);
		currentProgram.getMemory().setInt(address, bits);
	}

	/**
	 * Returns the 'double' value at the specified address in memory.
	 * @param address the address
	 * @return the 'double' value at the specified address in memory
	 * @throws MemoryAccessException if the memory is not readable
	 */
	public final double getDouble(Address address) throws MemoryAccessException {
		long bits = currentProgram.getMemory().getLong(address);
		return Double.longBitsToDouble(bits);
	}

	/**
	 * Sets the 'double' value at the specified address.
	 * @param address the address to set the 'double'
	 * @param value the value to set
	 * @throws MemoryAccessException if memory does not exist or is uninitialized
	 */
	public final void setDouble(Address address, double value) throws MemoryAccessException {
		long bits = Double.doubleToLongBits(value);
		currentProgram.getMemory().setLong(address, bits);
	}

	/**
	 * Returns an array of the references FROM the given address.
	 * @param address the from address of the references
	 * @return an array of the references FROM the given address
	 */
	public final Reference[] getReferencesFrom(Address address) {
		return currentProgram.getReferenceManager().getReferencesFrom(address);
	}

	/**
	 * Returns an array of the references TO the given address.
	 * Note: If more than 4096 references exists to this address,
	 * only the first 4096 will be returned.
	 * If you need to access all the references, please
	 * refer to the method <code>ReferenceManager::getReferencesTo(Address)</code>.
	 * @param address the from address of the references
	 * @return an array of the references TO the given address
	 */
	public final Reference[] getReferencesTo(Address address) {
		int count = currentProgram.getReferenceManager().getReferenceCountTo(address);
		if (count > MAX_REFERENCES_TO) {
			count = MAX_REFERENCES_TO;
		}
		int index = 0;
		Reference[] references = new Reference[count];
		ReferenceIterator iterator = currentProgram.getReferenceManager().getReferencesTo(address);
		while (iterator.hasNext()) {
			monitor.setMessage("Loading references to " + address + ": " + index + " of " + count);
			if (monitor.isCancelled() || index == MAX_REFERENCES_TO) {
				break;
			}
			references[index++] = iterator.next();
		}
		return references;
	}

	/**
	 * Returns the reference from the instruction to the given address.
	 * @param instruction the instruction
	 * @param toAddress the destination address
	 * @return the reference from the instruction to the given address
	 */
	public final Reference getReference(Instruction instruction, Address toAddress) {
		Reference[] references =
			currentProgram.getReferenceManager().getReferencesFrom(instruction.getMinAddress());
		for (Reference reference : references) {
			if (reference.getToAddress().equals(toAddress)) {
				return reference;
			}
		}
		return null;
	}

	/**
	 * Returns the reference from the data to the given address.
	 * @param data the data
	 * @param toAddress the destination address
	 * @return the reference from the data to the given address
	 */
	public final Reference getReference(Data data, Address toAddress) {
		Reference[] references =
			currentProgram.getReferenceManager().getReferencesFrom(data.getMinAddress());
		for (Reference reference : references) {
			if (reference.getToAddress().equals(toAddress)) {
				return reference;
			}
		}
		return null;
	}

	/**
	 * Creates a memory reference from the given instruction.
	 * @param instruction the instruction
	 * @param operandIndex the operand index on the instruction
	 * @param toAddress the TO address
	 * @param flowType the flow type of the reference
	 * @return the newly created memory reference
	 */
	public final Reference createMemoryReference(Instruction instruction, int operandIndex,
			Address toAddress, RefType flowType) {
		ReferenceManager referenceManager = currentProgram.getReferenceManager();
		Reference ref = referenceManager.addMemoryReference(instruction.getMinAddress(), toAddress,
			flowType, SourceType.USER_DEFINED, operandIndex);
		return ref;
	}

	/**
	 * Creates a memory reference from the given data.
	 * @param data the data
	 * @param toAddress the TO address
	 * @param dataRefType the type of the reference
	 * @return the newly created memory reference
	 */
	public final Reference createMemoryReference(Data data, Address toAddress,
			RefType dataRefType) {
		ReferenceManager referenceManager = currentProgram.getReferenceManager();
		Reference ref = referenceManager.addMemoryReference(data.getMinAddress(), toAddress,
			dataRefType, SourceType.USER_DEFINED, 0);
		return ref;
	}

	/**
	 * Creates an external reference from the given instruction.
	 * For instructions with flow, the FlowType will be assumed, otherwise
	 * {@link RefType#DATA} will be assumed.  To specify the appropriate
	 * RefType use the alternate form of this method.
	 * @param instruction the instruction
	 * @param operandIndex the operand index on the instruction
	 * @param libraryName the name of the library being referred
	 * @param externalLabel the name of function in the library being referred
	 * @param externalAddr the address of the function in the library being referred
	 * @return the newly created external reference
	 * @throws Exception if an exception occurs
	 */
	public final Reference createExternalReference(Instruction instruction, int operandIndex,
			String libraryName, String externalLabel, Address externalAddr) throws Exception {

		// Use inferred reference type
		RefType refType = RefType.DATA;
		FlowType flowType = instruction.getFlowType();
		if (flowType.isComputed()) {
			if (flowType.isCall()) {
				refType = RefType.COMPUTED_CALL;
			}
			else if (flowType.isJump()) {
				refType = RefType.COMPUTED_JUMP;
			}
		}
		else if (flowType.isCall()) {
			refType = RefType.UNCONDITIONAL_CALL;
		}
		else if (flowType.isJump()) {
			refType = RefType.UNCONDITIONAL_JUMP;
		}

		return createExternalReference(instruction, operandIndex, libraryName, externalLabel,
			externalAddr, refType);
	}

	/**
	 * Creates an external reference from the given instruction.
	 * @param instruction the instruction
	 * @param operandIndex the operand index on the instruction
	 * @param libraryName the name of the library being referred
	 * @param externalLabel the name of function in the library being referred
	 * @param externalAddr the address of the function in the library being referred
	 * @param refType the appropriate external reference type (e.g., DATA, COMPUTED_CALL, etc.)
	 * @return the newly created external reference
	 * @throws Exception if an exception occurs
	 */
	public final Reference createExternalReference(Instruction instruction, int operandIndex,
			String libraryName, String externalLabel, Address externalAddr, RefType refType)
			throws Exception {
		ReferenceManager referenceManager = currentProgram.getReferenceManager();
		Reference reference =
			referenceManager.addExternalReference(instruction.getMinAddress(), libraryName,
				externalLabel, externalAddr, SourceType.USER_DEFINED, operandIndex, refType);
		return reference;
	}

	/**
	 * Creates an external reference from the given data.  The reference type {@link RefType#DATA}
	 * will be used.
	 * @param data the data
	 * @param libraryName the name of the library being referred
	 * @param externalLabel the name of function in the library being referred
	 * @param externalAddr the address of the function in the library being referred
	 * @return the newly created external reference
	 * @throws Exception if an exception occurs
	 */
	public final Reference createExternalReference(Data data, String libraryName,
			String externalLabel, Address externalAddr) throws Exception {
		ReferenceManager referenceManager = currentProgram.getReferenceManager();
		Reference reference = referenceManager.addExternalReference(data.getMinAddress(),
			libraryName, externalLabel, externalAddr, SourceType.USER_DEFINED, 0, RefType.DATA);
		return reference;
	}

	/**
	 * Create a stack reference from the given instruction
	 * @param instruction the instruction
	 * @param operandIndex the operand index on the instruction
	 * @param stackOffset the stack offset of the reference
	 * @param isWrite true if the reference is WRITE access or false if the
	 * reference is READ access
	 * @return the newly created stack reference
	 */
	public final Reference createStackReference(Instruction instruction, int operandIndex,
			int stackOffset, boolean isWrite) {
		ReferenceManager referenceManager = currentProgram.getReferenceManager();
		RefType type = isWrite ? RefType.WRITE : RefType.READ;
		Reference ref = referenceManager.addStackReference(instruction.getMinAddress(),
			operandIndex, stackOffset, type, SourceType.USER_DEFINED);
		return ref;
	}

	/**
	 * Removes the given reference.
	 * @param reference the reference to remove
	 */
	public final void removeReference(Reference reference) {
		currentProgram.getReferenceManager().delete(reference);
	}

	/**
	 * Sets the given reference as primary.
	 * @param reference the reference to mark as primary
	 */
	public final void setReferencePrimary(Reference reference) {
		currentProgram.getReferenceManager().setPrimary(reference, true);
	}

	/**
	 * Sets the given reference as primary.
	 * @param reference the reference
	 * @param primary true if primary, false not primary
	 */
	public final void setReferencePrimary(Reference reference, boolean primary) {
		currentProgram.getReferenceManager().setPrimary(reference, primary);
	}

	/**
	 * Creates a new equate on the scalar value
	 * at the operand index of the instruction.
	 * @param instruction the instruction
	 * @param operandIndex the operand index on the instruction
	 * @param equateName the name of the equate
	 * @return the newly created equate
	 * @throws Exception if a scalar does not exist of the specified
	 * operand index of the instruction
	 */
	public final Equate createEquate(Instruction instruction, int operandIndex, String equateName)
			throws Exception {
		Object[] operandObject = instruction.getOpObjects(operandIndex);
		for (Object object : operandObject) {
			if (object instanceof Scalar) {
				Scalar scalar = (Scalar) object;
				long scalarValue = scalar.getUnsignedValue();
				Equate equate =
					currentProgram.getEquateTable().createEquate(equateName, scalarValue);
				equate.addReference(instruction.getMinAddress(), operandIndex);
				return equate;
			}
		}
		throw new InvalidInputException(
			"Unable to create equate on non-scalar instruction operand at " +
				instruction.getMinAddress());
	}

	/**
	 * Creates a new equate on the scalar value
	 * at the value of the data.
	 * @param data the data
	 * @param equateName the name of the equate
	 * @return the newly created equate
	 * @throws InvalidInputException if a scalar does not exist on the data
	 * @throws Exception if there is any exception
	 */
	public final Equate createEquate(Data data, String equateName) throws Exception {
		Object value = data.getValue();
		if (value instanceof Scalar) {
			Scalar scalar = (Scalar) value;
			long scalarValue = scalar.getUnsignedValue();
			Equate equate = currentProgram.getEquateTable().createEquate(equateName, scalarValue);
			equate.addReference(data.getMinAddress(), 0);
			return equate;
		}
		throw new InvalidInputException(
			"Unable to create equate on non-scalar value at " + data.getMinAddress());
	}

	/**
	 * Returns the equate defined at the operand index of the instruction with the given value.
	 * @param instruction the instruction
	 * @param operandIndex the operand index
	 * @param value scalar equate value
	 * @return the equate defined at the operand index of the instruction
	 */
	public final Equate getEquate(Instruction instruction, int operandIndex, long value) {
		return currentProgram.getEquateTable()
				.getEquate(instruction.getMinAddress(), operandIndex, value);
	}

	/**
	 * Returns the equates defined at the operand index of the instruction.
	 * @param instruction the instruction
	 * @param operandIndex the operand index
	 * @return the equate defined at the operand index of the instruction
	 */
	public final List<Equate> getEquates(Instruction instruction, int operandIndex) {
		return currentProgram.getEquateTable()
				.getEquates(instruction.getMinAddress(), operandIndex);
	}

	/**
	 * Returns the equate defined on the data.
	 * @param data the data
	 * @return the equate defined on the data
	 */
	public final Equate getEquate(Data data) {
		Object obj = data.getValue();
		if (obj instanceof Scalar) {
			return currentProgram.getEquateTable()
					.getEquate(data.getMinAddress(), 0, ((Scalar) obj).getValue());
		}
		return null;
	}

	/**
	 * Removes the equate defined at the operand index of the instruction with the given value.
	 * @param instruction the instruction
	 * @param operandIndex the operand index
	 * @param value scalar value corresponding to equate
	 */
	public final void removeEquate(Instruction instruction, int operandIndex, long value) {
		Address address = instruction.getMinAddress();
		Equate equate = currentProgram.getEquateTable().getEquate(address, operandIndex, value);
		equate.removeReference(address, operandIndex);
		if (equate.getReferenceCount() == 0) {
			currentProgram.getEquateTable().removeEquate(equate.getName());
		}
	}

	/**
	 * Removes the equates defined at the operand index of the instruction.
	 * @param instruction the instruction
	 * @param operandIndex the operand index
	 */
	public final void removeEquates(Instruction instruction, int operandIndex) {
		Address address = instruction.getMinAddress();
		List<Equate> equates = currentProgram.getEquateTable().getEquates(address, operandIndex);
		for (Equate equate : equates) {
			equate.removeReference(address, operandIndex);
			if (equate.getReferenceCount() == 0) {
				if (equate.getReferenceCount() == 0) {
					currentProgram.getEquateTable().removeEquate(equate.getName());
				}
			}
		}
	}

	/**
	 * Removes the equate defined on the data.
	 * @param data the data
	 */
	public final void removeEquate(Data data) {
		Address address = data.getMinAddress();
		List<Equate> equates = currentProgram.getEquateTable().getEquates(address, 0);
		for (Equate equate : equates) {
			equate.removeReference(address, 0);
			if (equate.getReferenceCount() == 0) {
				if (equate.getReferenceCount() == 0) {
					currentProgram.getEquateTable().removeEquate(equate.getName());
				}
			}
		}
	}

	/**
	 * Creates a <code>NOTE</code> bookmark at the specified address
	 * <br>
	 * NOTE: if a <code>NOTE</code> bookmark already exists at the address, it will be replaced.
	 * This is intentional and is done to match the behavior of setting bookmarks from the UI.
	 * 
	 * @param address  the address to create the bookmark
	 * @param category the bookmark category (it may be null)
	 * @param note  the bookmark text
	 * @return the newly created bookmark
	 */
	public final Bookmark createBookmark(Address address, String category, String note) {

		// enforce one bookmark per address, as this is what the UI does
		Bookmark[] existingBookmarks = getBookmarks(address);
		if (existingBookmarks != null && existingBookmarks.length > 0) {
			existingBookmarks[0].set(category, note);
			return existingBookmarks[0];
		}

		BookmarkManager bkm = currentProgram.getBookmarkManager();
		return bkm.setBookmark(address, BookmarkType.NOTE, category, note);
	}

	/**
	 * Returns all of the NOTE bookmarks defined at the specified address
	 * @param address the address to retrieve the bookmark
	 * @return the bookmarks at the specified address
	 */
	public final Bookmark[] getBookmarks(Address address) {
		return currentProgram.getBookmarkManager().getBookmarks(address, BookmarkType.NOTE);
	}

	/**
	 * Removes the specified bookmark.
	 * @param bookmark the bookmark to remove
	 */
	public final void removeBookmark(Bookmark bookmark) {
		currentProgram.getBookmarkManager().removeBookmark(bookmark);
	}

	/**
	 * Opens an existing File Data Type Archive.
	 * <p>
	 * <B>NOTE:</B> If archive has an assigned architecture, issues may arise due to a revised or
	 * missing {@link Language}/{@link CompilerSpec} which will result in a warning but not
	 * prevent the archive from being opened.  Such a warning condition will be logged and may 
	 * result in missing or stale information for existing datatypes which have architecture related
	 * data.  In some case it may be appropriate to 
	 * {@link FileDataTypeManager#getWarning() check for warnings} on the returned archive
	 * object prior to its use.
	 * 
	 * @param archiveFile the archive file to open
	 * @param readOnly should file be opened read only
	 * @return the data type manager
	 * @throws Exception if there is any exception
	 */
	public final FileDataTypeManager openDataTypeArchive(File archiveFile, boolean readOnly)
			throws Exception {
		return FileDataTypeManager.openFileArchive(archiveFile, !readOnly);
	}

	/**
	 * Saves the changes to the specified program.
	 * If the program does not already exist in the current project
	 * then it will be saved into the root folder.
	 * If a program already exists with the specified
	 * name, then a time stamp will be appended to the name to make it unique.
	 * @param program the program to save
	 * @throws Exception if there is any exception
	 */
	public void saveProgram(Program program) throws Exception {
		saveProgram(program, null);
	}

	/**
	 * Saves changes to the specified program.
	 * <p>
	 * If the program does not already exist in the current project
	 * then it will be saved into a project folder path specified by the path parameter.
	 * <p>
	 * If path is NULL, the program will be saved into the root folder.  If parts of the path are
	 * missing, they will be created if possible.
	 * <p>
	 * If a program already exists with the specified name, then a time stamp will be appended
	 * to the name to make it unique.
	 * 
	 * @param program the program to save
	 * @param path list of string path elements (starting at the root of the project) that specify
	 * the project folder to save the program info.  Example: { "folder1", "subfolder2",
	 * "final_folder" }
	 * @throws Exception if there is any exception
	 */
	public void saveProgram(Program program, List<String> path) throws Exception {
		if (program == null) {
			return;
		}
		if (program.getDomainFile().isInWritableProject()) {
			if (program == currentProgram) {
				end(true);
			}
			try {
				program.save(getClass().getName(), monitor);
			}
			finally {
				if (program == currentProgram) {
					start();
				}
			}
			return;
		}
		DomainFolder folder = getProjectRootFolder();
		if (path != null) {
			for (String folderName : path) {
				if (folderName == null || folderName.isEmpty()) {
					continue;
				}
				DomainFolder existingFolder = folder.getFolder(folderName);
				if (existingFolder == null) {
					folder = folder.createFolder(folderName);
				}
				else {
					folder = existingFolder;
				}
			}
		}
		if (program == currentProgram) {
			end(true);//end the current open transaction, so that we can save...
		}
		try {
			folder.createFile(program.getName(), program, monitor);
		}
		catch (DuplicateFileException e) {
			SimpleDateFormat formatter = new SimpleDateFormat("dd.MMM.yyyy_HH.mm.ss");
			String time = formatter.format(new Date());
			folder.createFile(program.getName() + "_" + time, program, monitor);
		}
		finally {
			if (program == currentProgram) {
				start();//start a new transaction, now that save is done...
			}
		}
		monitor.setCancelEnabled(true);
		folder.setActive();//makes the data tree expand to show new file!
	}

	/**
	 * This method looks up the current project and returns
	 * the root domain folder.
	 * @return the root domain folder of the current project
	 */
	public DomainFolder getProjectRootFolder() {
		Project project = AppInfo.getActiveProject();
		ProjectData projectData = project.getProjectData();
		DomainFolder folder = projectData.getRootFolder();
		return folder;
	}

	private Address findComment(CommentType type, String text) {
		Listing listing = currentProgram.getListing();
		Memory memory = currentProgram.getMemory();
		AddressIterator iter = listing.getCommentAddressIterator(type, memory, true);
		while (iter.hasNext() && !monitor.isCancelled()) {
			Address addr = iter.next();
			String plate = listing.getComment(type, addr);
			if (plate.indexOf(text) >= 0) {
				return addr;
			}
		}
		return null;
	}
}
