The base datatype class for the decompiler. More...

#include <type.hh>

Inheritance diagram for Datatype:

[legend]

Public Member Functions
	Datatype (const Datatype &op)
	Construct the base data-type copying low-level properties of another.

	Datatype (int4 s, type_metatype m)
	Construct the base data-type providing size and meta-type.

	Datatype (int4 s, type_metatype m, const string &n)
	Construct the base data-type providing size, meta-type, and name.

bool	hasSameVariableBase (const Datatype *ct) const
	Are these the same variable length data-type. More...

virtual void	printRaw (ostream &s) const
	Print a description of the type to stream. More...

virtual Datatype *	getSubType (uintb off, uintb *newoff) const
	Recover component data-type one-level down. More...

virtual Datatype *	nearestArrayedComponentForward (uintb off, uintb newoff, int4 elSize) const

virtual Datatype *	nearestArrayedComponentBackward (uintb off, uintb newoff, int4 elSize) const

virtual int4	compare (const Datatype &op, int4 level) const
	Compare for functional equivalence. More...

virtual int4	compareDependency (const Datatype &op) const
	Compare for storage in tree structure. More...

virtual Datatype *	clone (void) const =0
	Clone the data-type.

virtual void	saveXml (ostream &s) const
	Serialize the data-type to XML. More...

int4	typeOrderBool (const Datatype &op) const
	Order this with -op-, treating bool data-type as special. More...

void	saveXmlBasic (ostream &s) const
	Save basic data-type properties. More...

void	saveXmlRef (ostream &s) const
	Write an XML reference of this to stream. More...

bool	isPtrsubMatching (uintb offset) const
	Is this data-type suitable as input to a CPUI_PTRSUB op. More...

Protected Types
enum	{ coretype = 1, chartype = 2, enumtype = 4, poweroftwo = 8, utf16 = 16, utf32 = 32, opaque_string = 64, variable_length = 128 }
	Boolean properties of datatypes. More...

Protected Member Functions
void	restoreXmlBasic (const Element *el)
	Recover basic data-type properties. More...

virtual void	restoreXml (const Element *el, TypeFactory &typegrp)
	Restore data-type from XML. More...

Static Protected Member Functions
static uint8	hashName (const string &nm)
	Produce a data-type id by hashing the type name. More...

static uint8	hashSize (uint8 id, int4 size)
	Reversibly hash size into id. More...

Protected Attributes
int4	size
	Size (of variable holding a value of this type)

string	name
	Name of type.

type_metatype	metatype
	Meta-type - type disregarding size.

uint4	flags
	Boolean properties of the type.

uint8	id
	A unique id for the type (or 0 if an id is not assigned)

Friends
class	TypeFactory

struct	DatatypeCompare

Detailed Description

The base datatype class for the decompiler.

Used for symbols, function prototypes, type propagation etc.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

protected

Boolean properties of datatypes.

Enumerator
coretype	This is a basic type which will never be redefined.
chartype	ASCII character data.
enumtype	An enumeration type (as well as an integer)
poweroftwo	An enumeration type where all values are of 2^^n form.
utf16	16-bit wide chars in unicode UTF16
utf32	32-bit wide chars in unicode UTF32
opaque_string	Structure that should be treated as a string.
variable_length	May be other structures with same name different lengths.

Member Function Documentation

◆ compare()

int4 Datatype::compare	(	const Datatype &	op,
		int4	level
	)		const

virtual

Compare for functional equivalence.

0 (equality) means the data-types are functionally equivalent (even if names differ) Smaller types come earlier. More specific types come earlier.

Parameters

op	is the data-type to compare with this
level	is maximum level to descend when recursively comparing

Returns: negative, 0, positive depending on ordering of types

Reimplemented in TypeSpacebase, TypeCode, TypeStruct, TypeEnum, TypeArray, and TypePointer.

◆ compareDependency()

int4 Datatype::compareDependency ( const Datatype & op ) const

virtual

Compare for storage in tree structure.

Ordering of data-types for the main TypeFactory container. Comparison only goes down one-level in the component structure, before just comparing pointers.

Parameters

op	is the data-type to compare with this

Returns: negative, 0, positive depending on ordering of types

Reimplemented in TypeSpacebase, TypeCode, TypeStruct, TypeEnum, TypeArray, and TypePointer.

◆ getSubType()

Datatype * Datatype::getSubType	(	uintb	off,
		uintb *	newoff
	)		const

virtual

Recover component data-type one-level down.

Given an offset into this data-type, return the component data-type at that offset. Also, pass back a "renormalized" offset suitable for recursize getSubType() calls: i.e. if the original offset hits the exact start of the sub-type, 0 is passed back. If there is no valid component data-type at the offset, return NULL and pass back the original offset

Parameters

off	is the offset into this data-type
newoff	is a pointer to the passed-back offset

Returns: a pointer to the component data-type or NULL

Reimplemented in TypeSpacebase, TypeCode, TypeStruct, and TypeArray.

◆ hashName()

uint8 Datatype::hashName ( const string & nm )

staticprotected

Produce a data-type id by hashing the type name.

If a type id is explicitly provided for a data-type, this routine is used to produce an id based on a hash of the name. IDs produced this way will have their sign-bit set to distinguish it from other IDs.

Parameters

nm	is the type name to be hashed

◆ hashSize()

uint8 Datatype::hashSize	(	uint8	id,
		int4	size
	)

staticprotected

Reversibly hash size into id.

This allows IDs for variable length structures to be uniquefied based on size. A base ID is given and a size of the specific instance. A unique ID is returned. The hashing is reversible by feeding the output ID back into this function with the same size.

Parameters

id	is the given ID to (de)uniquify
size	is the instance size of the structure

Returns: the (de)uniquified id

◆ hasSameVariableBase()

bool Datatype::hasSameVariableBase ( const Datatype * ct ) const

Are these the same variable length data-type.

If this and the other given data-type are both variable length and come from the the same base data-type, return true.

Parameters

ct	is the other given data-type to compare with this

Returns: true if they are the same variable length data-type.

◆ isPtrsubMatching()

bool Datatype::isPtrsubMatching ( uintb offset ) const

Is this data-type suitable as input to a CPUI_PTRSUB op.

A CPUI_PTRSUB must act on a pointer data-type where the given offset addresses a component. Perform this check.

Parameters

offset is the given offset

Returns: true if this is a suitable PTRSUB data-type

◆ nearestArrayedComponentBackward()

Datatype * Datatype::nearestArrayedComponentBackward	(	uintb	off,
		uintb *	newoff,
		int4 *	elSize
	)		const

virtual

Find the first component data-type before the given offset that is (or contains) an array, and pass back the difference between the component's start and the given offset. Return the component data-type or null if no array is found.

Parameters

off	is the given offset into this data-type
newoff	is used to pass back the offset difference
elSize	is used to pass back the array element size

Returns: the component data-type or null

Reimplemented in TypeSpacebase, and TypeStruct.

◆ nearestArrayedComponentForward()

Datatype * Datatype::nearestArrayedComponentForward	(	uintb	off,
		uintb *	newoff,
		int4 *	elSize
	)		const

virtual

Find the first component data-type after the given offset that is (or contains) an array, and pass back the difference between the component's start and the given offset. Return the component data-type or null if no array is found.

Parameters

off	is the given offset into this data-type
newoff	is used to pass back the offset difference
elSize	is used to pass back the array element size

Returns: the component data-type or null

Reimplemented in TypeSpacebase, and TypeStruct.

◆ printRaw()

void Datatype::printRaw ( ostream & s ) const

virtual

Print a description of the type to stream.

Print a raw description of the type to stream. Intended for debugging. Not intended to produce parsable C.

Parameters

s	is the output stream

Reimplemented in TypeCode, TypeArray, and TypePointer.

◆ restoreXml()

void Datatype::restoreXml	(	const Element *	el,
		TypeFactory &	typegrp
	)

protectedvirtual

Restore data-type from XML.

Restore a Datatype object from an XML element

Parameters

el	is the XML element
typegrp	is the underlying TypeFactory that will hold the new object

Reimplemented in TypeCode, TypeStruct, TypeEnum, TypeArray, TypePointer, and TypeUnicode.

◆ restoreXmlBasic()

void Datatype::restoreXmlBasic ( const Element * el )

protected

Recover basic data-type properties.

Restore the basic properties (name,size,id) of a data-type from an XML element Properties are read from the attributes of the element

Parameters

el	is the XML element

◆ saveXml()

void Datatype::saveXml ( ostream & s ) const

virtual

Serialize the data-type to XML.

Write out a formal description of the data-type as an XML <type> tag. For composite data-types, the description goes down one level, describing the component types only by reference.

Parameters

s	is the stream to write to

Reimplemented in TypeSpacebase, TypeCode, TypeStruct, TypeEnum, TypeArray, TypePointer, TypeVoid, TypeUnicode, and TypeChar.

◆ saveXmlBasic()

void Datatype::saveXmlBasic ( ostream & s ) const

Save basic data-type properties.

Write out basic data-type properties (name,size,id) as XML attributes. This routine presumes the initial tag is already written to the stream.

Parameters

s	is the stream to write to

◆ saveXmlRef()

void Datatype::saveXmlRef ( ostream & s ) const

Write an XML reference of this to stream.

Write a simple reference to this data-type as an XML <typeref> tag, which only encodes the name and id.

Parameters

s	is the stream to write to

◆ typeOrderBool()

int4 Datatype::typeOrderBool ( const Datatype & op ) const

inline

Order this with -op-, treating bool data-type as special.

Order data-types, with special handling of the bool data-type. Data-types are compared using the normal ordering, but bool is ordered after all other data-types. A return value of 0 indicates the data-types are the same, -1 indicates that this is prefered (ordered earlier), and 1 indicates this is ordered later.

Parameters

op	is the other data-type to compare with this

Returns: -1, 0, or 1

The documentation for this class was generated from the following files:

type.hh
type.cc

Public Member Functions

Protected Types

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Friends

Detailed Description

Member Enumeration Documentation

◆ anonymous enum

Member Function Documentation

◆ compare()

◆ compareDependency()

◆ getSubType()

◆ hashName()

◆ hashSize()

◆ hasSameVariableBase()

◆ isPtrsubMatching()

◆ nearestArrayedComponentBackward()

◆ nearestArrayedComponentForward()

◆ printRaw()

◆ restoreXml()

◆ restoreXmlBasic()

◆ saveXml()

◆ saveXmlBasic()

◆ saveXmlRef()

◆ typeOrderBool()