Package ghidra.app.plugin.exceptionhandlers.gcc.datatype

Class AbstractLeb128DataType

java.lang.Object

ghidra.program.model.data.AbstractDataType

ghidra.program.model.data.DataTypeImpl

ghidra.program.model.data.BuiltIn

ghidra.app.plugin.exceptionhandlers.gcc.datatype.AbstractLeb128DataType

All Implemented Interfaces:

BuiltInDataType, DataType, Dynamic, ExtensionPoint

Direct Known Subclasses:

SignedLeb128DataType, UnsignedLeb128DataType

public abstract class AbstractLeb128DataType
extends BuiltIn
implements Dynamic

LEB128 is an integer compression system resulting in variable-length byte sequence. An abstract base class for a little endian base 128 integer data type.

Field Summary

Fields

Modifier and Type	Field	Description
static int	MAX_LEB128_ENCODED_VALUE_LEN	The maximum length in bytes of a leb128 data type.

Fields inherited from class ghidra.program.model.data.DataTypeImpl

defaultSettings

Fields inherited from class ghidra.program.model.data.AbstractDataType

categoryPath, dataMgr, name

Fields inherited from interface ghidra.program.model.data.DataType

CONFLICT_SUFFIX, DEFAULT, NO_LAST_CHANGE_TIME, NO_SOURCE_SYNC_TIME, VOID

Constructor Summary

Constructors

Constructor	Description
AbstractLeb128DataType(java.lang.String name, boolean signed, DataTypeManager dtm)	Base constructor for a little endian based 128 data type.

Method Summary

Modifier and Type	Method	Description
boolean	canSpecifyLength()	Determine if the length may be specified for an instanceof this datatype (e.g., Data, Array, DataTypeComponent, etc.).
protected SettingsDefinition[]	getBuiltInSettingsDefinitions()	Gets a list of all the settingsDefinitions used by this datatype.
java.lang.String	getDescription()	Get a String briefly describing this DataType.
int	getLength()	Get the length (number of 8-bit bytes) of this DataType.
int	getLength(MemBuffer buf, int maxLength)	Compute the length for this data-type which corresponds to the specified memory location.
DataType	getReplacementBaseType()	Returns a suitable replacement base data-type for pointers and arrays when exporting to C code
java.lang.String	getRepresentation(MemBuffer buf, Settings settings, int length)	Get bytes from memory in a printable format for this type.
java.lang.Object	getValue(MemBuffer buf, Settings settings, int length)	Get the data in the form of the appropriate Object for this DataType.

Methods inherited from class ghidra.program.model.data.BuiltIn

addParent, copy, dataTypeDeleted, dataTypeNameChanged, dataTypeReplaced, dataTypeSizeChanged, dependsOn, getCTypeDeclaration, getCTypeDeclaration, getCTypeDeclaration, getCTypeDeclaration, getDecompilerDisplayName, getLastChangeTime, getSettingsDefinitions, getUniversalID, isEquivalent, removeParent, setCategoryPath, setName, setNameAndCategory

Methods inherited from class ghidra.program.model.data.DataTypeImpl

equals, getAlignment, getDefaultSettings, getLastChangeTimeInSourceArchive, getParents, getPathName, getSourceArchive, getValueClass, hashCode, notifyAlignmentChanged, notifyDeleted, notifyNameChanged, notifyParents, notifyReplaced, notifySizeChanged, replaceWith, setDefaultSettings, setDescription, setLastChangeTime, setLastChangeTimeInSourceArchive, setSourceArchive

Methods inherited from class ghidra.program.model.data.AbstractDataType

dataTypeAlignmentChanged, encodeRepresentation, encodeValue, getCategoryPath, getDataOrganization, getDataTypeManager, getDataTypePath, getDefaultAbbreviatedLabelPrefix, getDefaultLabelPrefix, getDefaultLabelPrefix, getDefaultOffcutLabelPrefix, getDisplayName, getDocs, getMnemonic, getName, hasLanguageDependantLength, isDeleted, isEncodable, isNotYetDefined, isZeroLength, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface ghidra.program.model.data.BuiltInDataType

getCTypeDeclaration

Methods inherited from interface ghidra.program.model.data.DataType

addParent, clone, copy, dataTypeAlignmentChanged, dataTypeDeleted, dataTypeNameChanged, dataTypeReplaced, dataTypeSizeChanged, dependsOn, encodeRepresentation, encodeValue, getAlignment, getCategoryPath, getDataOrganization, getDataTypeManager, getDataTypePath, getDefaultAbbreviatedLabelPrefix, getDefaultLabelPrefix, getDefaultLabelPrefix, getDefaultOffcutLabelPrefix, getDefaultSettings, getDisplayName, getDocs, getLastChangeTime, getLastChangeTimeInSourceArchive, getMnemonic, getName, getParents, getPathName, getSettingsDefinitions, getSourceArchive, getUniversalID, getValueClass, hasLanguageDependantLength, isDeleted, isEncodable, isEquivalent, isNotYetDefined, isZeroLength, removeParent, replaceWith, setCategoryPath, setDefaultSettings, setDescription, setLastChangeTime, setLastChangeTimeInSourceArchive, setName, setNameAndCategory, setSourceArchive

Field Detail

MAX_LEB128_ENCODED_VALUE_LEN

public static final int MAX_LEB128_ENCODED_VALUE_LEN

The maximum length in bytes of a leb128 data type.

See Also:

Constant Field Values

Constructor Detail

AbstractLeb128DataType

public AbstractLeb128DataType(java.lang.String name,
                              boolean signed,
                              DataTypeManager dtm)

Base constructor for a little endian based 128 data type.

Parameters:

name - name of the leb128 data type that extends this class.

signed - true if it is signed. false if unsigned.

dtm - the data type manager to associate with this data type.

Method Detail

getBuiltInSettingsDefinitions

protected SettingsDefinition[] getBuiltInSettingsDefinitions()

Description copied from class: BuiltIn

Gets a list of all the settingsDefinitions used by this datatype.

Overrides:

getBuiltInSettingsDefinitions in class BuiltIn

Returns:

a list of the settingsDefinitions used by this datatype.

getDescription

public java.lang.String getDescription()

Description copied from interface: DataType

Get a String briefly describing this DataType.

Specified by:

getDescription in interface DataType

Returns:

a one-liner describing this DataType.

getLength

public int getLength()

Description copied from interface: DataType

Get the length (number of 8-bit bytes) of this DataType.

NOTE: No datatype should ever return 0, even if DataType.isZeroLength(), and only Dynamic datatypes should return -1. If DataType.isZeroLength() is true a length of 1 should be returned. Where a zero-length datatype can be handled (e.g., Composite) the DataType.isZeroLength() method should be used.

Specified by:

getLength in interface DataType

Returns:

the length of this DataType

getLength

public int getLength(MemBuffer buf,
                     int maxLength)

Description copied from interface: Dynamic

Compute the length for this data-type which corresponds to the specified memory location.

Specified by:

getLength in interface Dynamic

Parameters:

buf - memory location

maxLength - maximum number of bytes to consume in computing length, or -1 for unspecified.

Returns:

data length or -1 if it could not be determined. Returned length may exceed maxLength if data-type does not supported constrained lengths.

getValue

public java.lang.Object getValue(MemBuffer buf,
                                 Settings settings,
                                 int length)

Description copied from interface: DataType

Get the data in the form of the appropriate Object for this DataType.

For instance if the datatype is an AddressDT, return an Address object. a Byte, return a Scalar* (maybe this should be a Byte) a Float, return a Float

Specified by:

getValue in interface DataType

Parameters:

buf - the data buffer.

settings - the settings to use.

length - the number of bytes to get the value from.

Returns:

the data Object.

getRepresentation

public java.lang.String getRepresentation(MemBuffer buf,
                                          Settings settings,
                                          int length)

Description copied from interface: DataType

Get bytes from memory in a printable format for this type.

Specified by:

getRepresentation in interface DataType

Parameters:

buf - the data.

settings - the settings to use for the representation.

length - the number of bytes to represent.

Returns:

the representation of the data in this format, never null.

getReplacementBaseType

public DataType getReplacementBaseType()

Description copied from interface: Dynamic

Returns a suitable replacement base data-type for pointers and arrays when exporting to C code

Specified by:

getReplacementBaseType in interface Dynamic

Returns:

suitable base data-type for this Dynamic data-type

canSpecifyLength

public boolean canSpecifyLength()

Description copied from interface: Dynamic

Determine if the length may be specified for an instanceof this datatype (e.g., Data, Array, DataTypeComponent, etc.).

Specified by:

canSpecifyLength in interface Dynamic

Returns:

true if a user-specified length can be used, else false