Container class for ParamTrial objects. More...

#include <fspec.hh>

Public Member Functions
	ParamActive (bool recoversub)
	Constructor an empty container. More...

void	clear (void)
	Reset to an empty container.

void	registerTrial (const Address &addr, int4 sz)
	Add a new trial to the container. More...

int4	getNumTrials (void) const
	Get the number of trials in this container.

ParamTrial &	getTrial (int4 i)
	Get the i-th trial.

const ParamTrial &	getTrialForInputVarnode (int4 slot) const
	Get trial corresponding to the given input Varnode. More...

int4	whichTrial (const Address &addr, int4 sz) const
	Get the trial overlapping with the given memory range. More...

bool	needsFinalCheck (void) const
	Is a final check required.

void	markNeedsFinalCheck (void)
	Mark that a final check is required.

bool	isRecoverSubcall (void) const
	Are these trials for a call to a sub-function.

bool	isFullyChecked (void) const
	Are all trials checked with no new trials expected.

void	markFullyChecked (void)
	Mark that all trials are checked.

void	setPlaceholderSlot (void)
	Establish a stack placedholder slot.

void	freePlaceholderSlot (void)
	Free the stack placeholder slot. More...

int4	getNumPasses (void) const
	How many trial analysis passes were performed.

int4	getMaxPass (void) const
	What is the maximum number of passes.

void	setMaxPass (int4 val)
	Set the maximum number of passes.

void	finishPass (void)
	Mark that an analysis pass has completed.

void	sortTrials (void)
	Sort the trials in formal parameter order.

void	deleteUnusedTrials (void)
	Remove trials that were found not to be parameters. More...

void	splitTrial (int4 i, int4 sz)
	Split the given trial in two. More...

void	joinTrial (int4 slot, const Address &addr, int4 sz)
	Join adjacent parameter trials. More...

int4	getNumUsed (void) const
	Get number of trials marked as formal parameters. More...

bool	testShrink (int4 i, const Address &addr, int4 sz) const
	Test if the given trial can be shrunk to the given range. More...

void	shrink (int4 i, const Address &addr, int4 sz)
	Shrink the given trial to a new given range. More...

Private Attributes
vector< ParamTrial >	trial
	The list of parameter trials.

int4	slotbase
	Slot where next parameter will go.

int4	stackplaceholder
	Which call input slot holds the stack placeholder.

int4	numpasses
	Number of attempts at evaluating parameters.

int4	maxpass
	Number of passes before we assume we have seen all params.

bool	isfullychecked
	True if all trials are fully examined (and no new trials are expected)

bool	needsfinalcheck
	Should a final pass be made on trials (to take into account control-flow changes)

bool	recoversubcall
	True if this is being used to recover prototypes of a sub-function call.

Detailed Description

Container class for ParamTrial objects.

The parameter analysis algorithms use this class to maintain the collection of parameter trials being actively considered for a given function. It holds the ParamTrial objects and other information about the current state of analysis.

Trials are maintained in two stages, before parameter decisions have been made and after. Before, trials are in input index order relative to the CALL or CALLIND op for a sub-function, or they are in address order for input Varnodes to the active function. After, the trials are put into formal parameter order, as dictated by the PrototypeModel.

Constructor & Destructor Documentation

◆ ParamActive()

ParamActive::ParamActive ( bool recoversub )

Constructor an empty container.

Parameters

recoversub selects whether a sub-function or the active function is being tested

References isfullychecked, maxpass, needsfinalcheck, numpasses, recoversubcall, slotbase, and stackplaceholder.

Member Function Documentation

◆ deleteUnusedTrials()

void ParamActive::deleteUnusedTrials ( void )

Remove trials that were found not to be parameters.

Delete any trial for which isUsed() returns false. This is used in conjunction with setting the active Varnodes on a call, so the slot number is reordered too.

References ParamTrial::isUsed(), ParamTrial::setSlot(), and trial.

Referenced by FuncCallSpecs::buildInputFromTrials(), and FuncCallSpecs::buildOutputFromTrials().

◆ freePlaceholderSlot()

void ParamActive::freePlaceholderSlot ( void )

Free the stack placeholder slot.

Free up the stack placeholder slot, which may cause trial slots to get adjusted.

References maxpass, slotbase, stackplaceholder, and trial.

Referenced by FuncCallSpecs::clearStackPlaceholderSlot().

◆ getNumUsed()

int4 ParamActive::getNumUsed ( void ) const

Get number of trials marked as formal parameters.

This assumes the trials have been sorted. So used trials are first.

Returns: the number of formally used trials

References trial.

◆ getTrialForInputVarnode()

const ParamTrial & ParamActive::getTrialForInputVarnode ( int4 slot ) const

inline

Get trial corresponding to the given input Varnode.

Return the trial associated with the input Varnode to the associated p-code CALL or CALLIND. We take into account the call address parameter (subtract 1) and if the index occurs after the index holding the stackpointer placeholder, we subtract an additional 1.

Parameters

slot	is the input index of the input Varnode

Returns: the corresponding parameter trial

References stackplaceholder, and trial.

Referenced by Funcdata::checkCallDoubleUse(), FuncCallSpecs::checkInputJoin(), and FuncCallSpecs::doInputJoin().

◆ joinTrial()

void ParamActive::joinTrial	(	int4	slot,
		const Address &	addr,
		int4	sz
	)

Join adjacent parameter trials.

Join the trial at the given slot with the trial in the next slot

Parameters

slot	is the given slot
addr	is the address of the new joined memory range
sz	is the size of the new memory range

References ParamTrial::getSize(), ParamTrial::getSlot(), slotbase, stackplaceholder, and trial.

Referenced by FuncCallSpecs::doInputJoin().

◆ registerTrial()

void ParamActive::registerTrial	(	const Address &	addr,
		int4	sz
	)

Add a new trial to the container.

A ParamTrial object is created and a slot is assigned.

Parameters

addr	is the starting address of the memory range
sz	is the number of bytes in the range

References Address::getSpace(), AddrSpace::getType(), IPTR_SPACEBASE, slotbase, and trial.

Referenced by ActionInputPrototype::apply(), ParamListStandard::buildTrialMap(), FuncCallSpecs::commitNewInputs(), FuncCallSpecs::commitNewOutputs(), ActionFuncLink::funcLinkInput(), Heritage::guardCalls(), and Heritage::guardReturns().

◆ shrink()

void ParamActive::shrink	(	int4	i,
		const Address &	addr,
		int4	sz
	)

inline

Shrink the given trial to a new given range.

Parameters

i	is the index of the given trial
addr	is the new range's starting address
sz	is the new range's size in bytes

References trial.

◆ splitTrial()

void ParamActive::splitTrial	(	int4	i,
		int4	sz
	)

Split the given trial in two.

Split the trial into two trials, where the first piece has the given size.

Parameters

i	is the index of the given trial
sz	is the given size

References slotbase, stackplaceholder, and trial.

Referenced by ActionParamDouble::apply().

◆ testShrink()

bool ParamActive::testShrink	(	int4	i,
		const Address &	addr,
		int4	sz
	)		const

inline

Test if the given trial can be shrunk to the given range.

Parameters

i	is the index of the given trial
addr	is the new address
sz	is the new size

Returns: true if the trial can be shrunk to the new range

References trial.

◆ whichTrial()

int4 ParamActive::whichTrial	(	const Address &	addr,
		int4	sz
	)		const

Get the trial overlapping with the given memory range.

The (index of) the first overlapping trial is returned.

Parameters

addr	is the starting address of the given range
sz	is the number of bytes in the range

Returns: the index of the overlapping trial, or -1 if no trial overlaps

References Address::overlap(), and trial.

Referenced by FuncCallSpecs::collectOutputTrialVarnodes(), and Heritage::guardCalls().

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

fspec.hh
fspec.cc

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ ParamActive()

Member Function Documentation

◆ deleteUnusedTrials()

◆ freePlaceholderSlot()

◆ getNumUsed()

◆ getTrialForInputVarnode()

◆ joinTrial()

◆ registerTrial()

◆ shrink()

◆ splitTrial()

◆ testShrink()

◆ whichTrial()