An internal data-type for holding information about a variable's relative position within a union data-type. More...

#include <type.hh>

Inheritance diagram for ghidra::TypePartialUnion:

Public Member Functions
	TypePartialUnion (const TypePartialUnion &op)
	Construct from another TypePartialUnion.

	TypePartialUnion (TypeUnion contain, int4 off, int4 sz, Datatype strip)
	Constructor.

TypeUnion *	getParentUnion (void) const
	Get the union which this is part of.

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

virtual const TypeField *	findTruncation (int8 off, int4 sz, const PcodeOp *op, int4 slot, int8 &newoff) const
	Find an immediate subfield of this data-type. More...

virtual int4	numDepend (void) const
	Return number of component sub-types.

virtual Datatype *	getDepend (int4 index) const
	Return the i-th component sub-type.

virtual int4	compare (const Datatype &op, int4 level) const
	Order types for propagation. More...

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

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

virtual void	encode (Encoder &encoder) const
	Encode the data-type to a stream. More...

virtual Datatype *	getStripped (void) const
	Get a stripped version of this for formal use in formal declarations. More...

virtual Datatype *	resolveInFlow (PcodeOp *op, int4 slot)
	Tailor data-type propagation based on Varnode use. More...

virtual Datatype *	findResolve (const PcodeOp *op, int4 slot)
	Find a previously resolved sub-type. More...

virtual int4	findCompatibleResolve (Datatype *ct) const
	Find a resolution compatible with the given data-type. More...

virtual const TypeField *	resolveTruncation (int8 off, PcodeOp *op, int4 slot, int8 &newoff)
	Resolve which union field is being used for a given PcodeOp when a truncation is involved. More...

Public Member Functions inherited from ghidra::Datatype
	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.

virtual	~Datatype (void)
	Destructor.

bool	isCoreType (void) const
	Is this a core data-type.

bool	isCharPrint (void) const
	Does this print as a 'char'.

bool	isEnumType (void) const
	Is this an enumerated type.

bool	isPowerOfTwo (void) const
	Is this a flag-based enumeration.

bool	isASCII (void) const
	Does this print as an ASCII 'char'.

bool	isUTF16 (void) const
	Does this print as UTF16 'wchar'.

bool	isUTF32 (void) const
	Does this print as UTF32 'wchar'.

bool	isVariableLength (void) const
	Is this a variable length structure.

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

bool	isOpaqueString (void) const
	Is this an opaquely encoded string.

bool	isPointerRel (void) const
	Is this a TypePointerRel.

bool	isFormalPointerRel (void) const
	Is this a non-ephemeral TypePointerRel.

bool	hasStripped (void) const
	Return true if this has a stripped form.

bool	isIncomplete (void) const
	Is this an incompletely defined data-type.

bool	needsResolution (void) const
	Is this a union or a pointer to union.

uint4	getInheritable (void) const
	Get properties pointers inherit.

uint4	getDisplayFormat (void) const
	Get the display format for constants with this data-type. More...

type_metatype	getMetatype (void) const
	Get the type meta-type.

sub_metatype	getSubMeta (void) const
	Get the sub-metatype.

uint8	getId (void) const
	Get the type id.

int4	getSize (void) const
	Get the type size.

const string &	getName (void) const
	Get the type name.

const string &	getDisplayName (void) const
	Get string to use in display.

Datatype *	getTypedef (void) const
	Get the data-type immediately typedefed by this (or null)

virtual Datatype *	getSubType (int8 off, int8 *newoff) const
	Recover component data-type one-level down. More...

virtual Datatype *	nearestArrayedComponentForward (int8 off, int8 newoff, int8 elSize) const

virtual Datatype *	nearestArrayedComponentBackward (int8 off, int8 newoff, int8 elSize) const

virtual int4	getHoleSize (int4 off) const
	Get number of bytes at the given offset that are padding.

virtual void	printNameBase (ostream &s) const
	Print name as short prefix.

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

int4	typeOrder (const Datatype &op) const
	Order this with -op- datatype.

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

void	encodeRef (Encoder &encoder) const
	Encode a reference of this to a stream. More...

bool	isPieceStructured (void) const
	Does this data-type consist of separate pieces? More...

Protected Attributes
Datatype *	stripped
	The undefined data-type to use if a formal data-type is required.

TypeUnion *	container
	Union data-type containing this partial data-type.

int4	offset
	Offset (in bytes) into the container union.

Protected Attributes inherited from ghidra::Datatype
uint8	id
	A unique id for the type (or 0 if an id is not assigned)

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

uint4	flags
	Boolean properties of the type.

string	name
	Name of type.

string	displayName
	Name to display in output.

type_metatype	metatype
	Meta-type - type disregarding size.

sub_metatype	submeta
	Sub-type of of the meta-type, for comparisons.

Datatype *	typedefImm
	The immediate data-type being typedefed by this.

Friends
class	TypeFactory

Additional Inherited Members
Static Public Member Functions inherited from ghidra::Datatype
static uint4	encodeIntegerFormat (const string &val)
	Encode the format attribute from an XML element. More...

static string	decodeIntegerFormat (uint4 val)
	Decode the given format value into an XML attribute string. More...

Protected Types inherited from ghidra::Datatype
enum	{ coretype = 1, chartype = 2, enumtype = 4, poweroftwo = 8, utf16 = 16, utf32 = 32, opaque_string = 64, variable_length = 128, has_stripped = 0x100, is_ptrrel = 0x200, type_incomplete = 0x400, needs_resolution = 0x800, force_format = 0x7000, truncate_bigendian = 0x8000 }
	Boolean properties of datatypes. More...

Protected Member Functions inherited from ghidra::Datatype
void	decodeBasic (Decoder &decoder)
	Recover basic data-type properties. More...

void	encodeBasic (type_metatype meta, Encoder &encoder) const
	Encode basic data-type properties. More...

void	encodeTypedef (Encoder &encoder) const
	Encode this as a typedef element to a stream. More...

void	markComplete (void)
	Mark this data-type as completely defined.

void	setDisplayFormat (uint4 format)
	Set a specific display format. More...

Static Protected Member Functions inherited from ghidra::Datatype
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...

Static Protected Attributes inherited from ghidra::Datatype
static sub_metatype	base2sub [15]

Detailed Description

An internal data-type for holding information about a variable's relative position within a union data-type.

This is a data-type that can be assigned to a Varnode offset into a Symbol, where either the Symbol itself or a sub-field is a TypeUnion. In these cases, we know the Varnode is properly contained within a TypeUnion, but the lack of context prevents us from deciding which field of the TypeUnion applies (and possibly the sub-field of the field).

Member Function Documentation

◆ compare()

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

virtual

Order types for propagation.

Order this with another data-type, in a way suitable for the type propagation algorithm. Bigger 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 from ghidra::Datatype.

References ghidra::Datatype::compare(), ghidra::TypeUnion::compare(), container, ghidra::Datatype::getId(), and offset.

◆ compareDependency()

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

virtual

Compare for storage in tree structure.

Sort data-types for the main TypeFactory container. The sort needs to be based on the data-type structure so that an example data-type, constructed outside the factory, can be used to find the equivalent object inside the factory. This means the comparison should not examine the data-type id. In practice, the comparison only needs to go down one level in the component structure before just comparing component pointers.

Parameters

op	is the data-type to compare with this

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

Reimplemented from ghidra::Datatype.

References container, ghidra::Datatype::getSize(), ghidra::Datatype::getSubMeta(), offset, ghidra::Datatype::size, and ghidra::Datatype::submeta.

◆ encode()

void ghidra::TypePartialUnion::encode ( Encoder & encoder ) const

virtual

Encode the data-type to a stream.

Encode a formal description of the data-type as a <type> element. For composite data-types, the description goes down one level, describing the component types only by reference.

Parameters

encoder is the stream encoder

Reimplemented from ghidra::Datatype.

References ghidra::Encoder::closeElement(), container, ghidra::Datatype::encodeBasic(), ghidra::Datatype::encodeRef(), offset, ghidra::Encoder::openElement(), and ghidra::Encoder::writeSignedInteger().

◆ findCompatibleResolve()

int4 ghidra::TypePartialUnion::findCompatibleResolve ( Datatype * ct ) const

virtual

Find a resolution compatible with the given data-type.

If this data-type has an alternate data-type form that matches the given data-type, return an index indicating this form, otherwise return -1.

Parameters

ct	is the given data-type

Returns: the index of the matching form or -1

Reimplemented from ghidra::Datatype.

References container, and ghidra::TypeUnion::findCompatibleResolve().

◆ findResolve()

Datatype * ghidra::TypePartialUnion::findResolve	(	const PcodeOp *	op,
		int4	slot
	)

virtual

Find a previously resolved sub-type.

This is the constant version of resolveInFlow. If a resulting subtype has already been calculated, for the particular read (slot >= 0) or write (slot == -1), then return it. Otherwise return the original data-type.

Parameters

op	is the PcodeOp using the Varnode assigned with this data-type
slot	is the slot reading or writing the Varnode

Returns: the resolved subtype or the original data-type

Reimplemented from ghidra::Datatype.

References container, ghidra::Datatype::findResolve(), ghidra::Datatype::getMetatype(), ghidra::Datatype::getSize(), ghidra::Datatype::getSubType(), offset, ghidra::Datatype::size, stripped, and ghidra::TYPE_UNION.

◆ findTruncation()

const TypeField * ghidra::TypePartialUnion::findTruncation	(	int8	off,
		int4	sz,
		const PcodeOp *	op,
		int4	slot,
		int8 &	newoff
	)		const

virtual

Find an immediate subfield of this data-type.

Given a byte range within this data-type, determine the field it is contained in and pass back the renormalized offset. This method applies to TYPE_STRUCT, TYPE_UNION, and TYPE_PARTIALUNION, data-types that have field components. For TYPE_UNION and TYPE_PARTIALUNION, the field may depend on the p-code op extracting or writing the value.

Parameters

off	is the byte offset into this
sz	is the size of the byte range
op	is the PcodeOp reading/writing the data-type
slot	is the index of the Varnode being accessed, -1 for the output, >=0 for an input
newoff	points to the renormalized offset to pass back

Returns: the containing field or NULL if the range is not contained

Reimplemented from ghidra::Datatype.

References container, ghidra::TypeUnion::findTruncation(), and offset.

◆ getStripped()

virtual Datatype* ghidra::TypePartialUnion::getStripped ( void ) const

inlinevirtual

Get a stripped version of this for formal use in formal declarations.

Some data-types are ephemeral, and, in the final decompiler output, get replaced with a formal version that is a stripped down version of the original. This method returns this stripped down version, if it exists, or null otherwise. A non-null return should correspond with hasStripped returning true.

Returns: the stripped version or null

Reimplemented from ghidra::Datatype.

References ghidra::Datatype::findCompatibleResolve(), ghidra::Datatype::findResolve(), ghidra::Datatype::resolveInFlow(), and ghidra::Datatype::resolveTruncation().

◆ printRaw()

void ghidra::TypePartialUnion::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 from ghidra::Datatype.

References container, offset, and ghidra::Datatype::printRaw().

◆ resolveInFlow()

Datatype * ghidra::TypePartialUnion::resolveInFlow	(	PcodeOp *	op,
		int4	slot
	)

virtual

Tailor data-type propagation based on Varnode use.

For certain data-types, particularly union, variables of that data-type are transformed into a subtype depending on the particular use. Each read or write of the variable may use a different subtype. This method returns the particular subtype required based on a specific PcodeOp. A slot index >=0 indicates which operand reads the variable, or if the index is -1, the variable is written.

Parameters

op	is the specific PcodeOp
slot	indicates the input operand, or the output

Returns: the resolved sub-type

Reimplemented from ghidra::Datatype.

References container, ghidra::Datatype::getMetatype(), ghidra::Datatype::getSize(), ghidra::Datatype::getSubType(), offset, ghidra::Datatype::resolveTruncation(), ghidra::Datatype::size, stripped, ghidra::TypeField::type, and ghidra::TYPE_UNION.

◆ resolveTruncation()

const TypeField * ghidra::TypePartialUnion::resolveTruncation	(	int8	offset,
		PcodeOp *	op,
		int4	slot,
		int8 &	newoff
	)

virtual

Resolve which union field is being used for a given PcodeOp when a truncation is involved.

This method applies to the TYPE_UNION and TYPE_PARTIALUNION data-types, when a Varnode is backed by a larger Symbol with a union data-type, or if the Varnode is produced by a CPUI_SUBPIECE where the input Varnode has a union data-type. Scoring is done to compute the best field and the result is cached with the function. The record of the best field is returned or null if there is no appropriate field

Parameters

offset	is the byte offset into the union we are truncating to
op	is either the PcodeOp reading the truncated Varnode or the CPUI_SUBPIECE doing the truncation
slot	is either the input slot of the reading PcodeOp or the artificial SUBPIECE slot: 1
newoff	is used to pass back how much offset is left to resolve

Returns: the field of the union best associated with the truncation or null

Reimplemented from ghidra::Datatype.

References container, offset, and ghidra::TypeUnion::resolveTruncation().

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

type.hh
type.cc

Public Member Functions

Protected Attributes

Friends

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ compare()

◆ compareDependency()

◆ encode()

◆ findCompatibleResolve()

◆ findResolve()

◆ findTruncation()

◆ getStripped()

◆ printRaw()

◆ resolveInFlow()

◆ resolveTruncation()