Convert INT_MULT and shift forms into INT_DIV or INT_SDIV. More...

Inheritance diagram for RuleDivOpt:

Public Member Functions
	RuleDivOpt (const string &g)
	Constructor.

virtual Rule *	clone (const ActionGroupList &grouplist) const
	Clone the Rule. More...

virtual void	getOpList (vector< uint4 > &oplist) const
	List of op codes this rule operates on. More...

virtual int4	applyOp (PcodeOp *op, Funcdata &data)
	Attempt to apply this Rule. More...

Public Member Functions inherited from Rule
	Rule (const string &g, uint4 fl, const string &nm)
	Construct given group, properties name. More...

virtual	~Rule (void)
	Destructor.

const string &	getName (void) const
	Return the name of this Rule.

const string &	getGroup (void) const
	Return the group this Rule belongs to.

uint4	getNumTests (void)
	Get number of attempted applications.

uint4	getNumApply (void)
	Get number of successful applications.

void	setBreak (uint4 tp)
	Set a breakpoint on this Rule.

void	clearBreak (uint4 tp)
	Clear a breakpoint on this Rule.

void	turnOnWarnings (void)
	Enable warnings for this Rule.

void	turnOffWarnings (void)
	Disable warnings for this Rule.

bool	isDisabled (void) const
	Return true if this Rule is disabled.

void	setDisable (void)
	Disable this Rule (within its pool)

void	clearDisable (void)
	Enable this Rule (within its pool)

bool	checkActionBreak (void)
	Check if an action breakpoint is turned on. More...

uint4	getBreakPoint (void) const
	Return breakpoint toggles.

virtual void	reset (Funcdata &data)
	Reset this Rule. More...

virtual void	resetStats (void)
	Reset Rule statistics. More...

virtual void	printStatistics (ostream &s) const
	Print statistics for this Rule. More...

Static Public Member Functions
static PcodeOp *	findSubshift (PcodeOp *op, int4 &n, OpCode &shiftopc)
	Check for shift form of expression. More...

Static Private Member Functions
static uintb	calcDivisor (uintb n, uint8 y, int4 xsize)
	Calculate the divisor. More...

Additional Inherited Members
Public Types inherited from Rule
enum	typeflags { type_disable = 1, rule_debug = 2, warnings_on = 4, warnings_given = 8 }
	Properties associated with a Rule. More...

Detailed Description

Convert INT_MULT and shift forms into INT_DIV or INT_SDIV.

The unsigned and signed variants are:

sub( (zext(V)*c)>>n, 0) => V / (2^n/(c-1))
sub( (sext(V)*c)s>>n, 0) => V s/ (2^n/(c-1))

Member Function Documentation

◆ applyOp()

int4 RuleDivOpt::applyOp	(	PcodeOp *	op,
		Funcdata &	data
	)

virtual

Attempt to apply this Rule.

This method contains the main logic for applying the Rule. It must use a given PcodeOp as the point at which the Rule applies. If it does apply, changes are made directly to the function and 1 (non-zero) is returned, otherwise 0 is returned.

Parameters

op	is the given PcodeOp where the Rule may apply
data	is the function to which to apply

Reimplemented from Rule.

References calcDivisor(), PcodeOp::code(), CPUI_INT_ADD, CPUI_INT_DIV, CPUI_INT_MULT, CPUI_INT_RIGHT, CPUI_INT_SDIV, CPUI_INT_SEXT, CPUI_INT_SRIGHT, CPUI_INT_ZEXT, findSubshift(), PcodeOp::getAddr(), Varnode::getDef(), PcodeOp::getIn(), PcodeOp::getOut(), Varnode::getSize(), Varnode::isConstantExtended(), Varnode::isFree(), Varnode::isWritten(), Funcdata::newConstant(), Funcdata::newOp(), Funcdata::newUniqueOut(), Funcdata::opInsertBefore(), Funcdata::opSetInput(), and Funcdata::opSetOpcode().

◆ calcDivisor()

uintb RuleDivOpt::calcDivisor	(	uintb	n,
		uint8	y,
		int4	xsize
	)

staticprivate

Calculate the divisor.

Given the multiplicative encoding y and the n, the power of 2, Compute:

divisor = 2^n / (y-1)

Do some additional checks on the parameters as an optimized encoding of a divisor.

Parameters

n	is the power of 2
y	is the multiplicative coefficient
xsize	is the maximum power of 2

Returns: the divisor or 0 if the checks fail

References power2Divide().

Referenced by applyOp().

◆ clone()

virtual Rule* RuleDivOpt::clone ( const ActionGroupList & grouplist ) const

inlinevirtual

Clone the Rule.

If this Rule is a member of one of the groups in the grouplist, this returns a clone of the Rule, otherwise NULL is returned.

Parameters

grouplist is the list of groups being cloned

Returns: the cloned Rule or NULL

Implements Rule.

References ActionGroupList::contains(), Rule::getGroup(), and RuleDivOpt().

◆ findSubshift()

PcodeOp * RuleDivOpt::findSubshift	(	PcodeOp *	op,
		int4 &	n,
		OpCode &	shiftopc
	)

static

Check for shift form of expression.

Look for the two forms:

sub(V,c) or
sub(V,c) >> n

Pass back whether a shift was involved and the total truncation in bits: n+c*8

Parameters

op	is the root of the expression
n	is the reference that will hold the total truncation
shiftopc	will hold the shift OpCode if used, CPUI_MAX otherwise

Returns: the SUBPIECE op if present or NULL otherwise

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

Referenced by RuleDivTermAdd::applyOp(), and applyOp().

◆ getOpList()

void RuleDivOpt::getOpList ( vector< uint4 > & oplist ) const

virtual

List of op codes this rule operates on.

Populate the given array with all possible OpCodes this Rule might apply to. By default, this method returns all possible OpCodes

Parameters

oplist is the array to populate

Reimplemented from Rule.

References CPUI_INT_RIGHT, CPUI_INT_SRIGHT, and CPUI_SUBPIECE.

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

ruleaction.hh
ruleaction.cc

Public Member Functions

Static Public Member Functions

Static Private Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ applyOp()

◆ calcDivisor()

◆ clone()

◆ findSubshift()

◆ getOpList()