varnode.hh File Reference

The Varnode and VarnodeBank classes. More...

#include "pcoderaw.hh"
#include "cover.hh"

Classes
struct	VarnodeCompareLocDef
	Compare two Varnode pointers by location then definition. More...
struct	VarnodeCompareDefLoc
	Compare two Varnode pointers by definition then location. More...
class	Varnode
	A low-level variable or contiguous set of bytes described by an Address and a size. More...
class	VarnodeBank
	A container for Varnode objects from a specific function. More...

Typedefs
typedef set< Varnode *, VarnodeCompareLocDef >	VarnodeLocSet
	A set of Varnodes sorted by location (then by definition)
typedef set< Varnode *, VarnodeCompareDefLoc >	VarnodeDefSet
	A set of Varnodes sorted by definition (then location)

Functions
bool	contiguous_test (Varnode *vn1, Varnode *vn2)
	Test if Varnodes are pieces of a whole. More...
Varnode *	findContiguousWhole (Funcdata &data, Varnode *vn1, Varnode *vn2)
	Retrieve the whole Varnode given pieces. More...

Detailed Description

The Varnode and VarnodeBank classes.

Function Documentation

contiguous_test()

bool contiguous_test	(	Varnode *	vn1,
		Varnode *	vn2
	)

Test if Varnodes are pieces of a whole.

Return true if vn1 contains the high part and vn2 the low part of what was(is) a single value.

Parameters

vn1	is the putative high Varnode
vn2	is the putative low Varnode

Returns

true if they are pieces of a whole

References PcodeOp::code(), CPUI_SUBPIECE, Varnode::getDef(), PcodeOp::getIn(), Varnode::getOffset(), Varnode::getSize(), Varnode::isInput(), and Varnode::isWritten().

Referenced by RuleSegment::applyOp().

findContiguousWhole()

Varnode* findContiguousWhole	(	Funcdata &	data,
		Varnode *	vn1,
		Varnode *	vn2
	)

Retrieve the whole Varnode given pieces.

Assuming vn1,vn2 has passed the contiguous_test(), return the Varnode containing the whole value.

Parameters

data	is the underlying function
vn1	is the high Varnode
vn2	is the low Varnode

Returns

the whole Varnode

References PcodeOp::code(), CPUI_SUBPIECE, Varnode::getDef(), PcodeOp::getIn(), and Varnode::isWritten().

Referenced by RuleSegment::applyOp().