Find Varnodes with a vectorized lane scheme and attempt to split the lanes. More...

#include <coreaction.hh>

Inheritance diagram for ghidra::ActionLaneDivide:

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

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

virtual int4	apply (Funcdata &data)
	Make a single attempt to apply this Action. More...

Public Member Functions inherited from ghidra::Action
	Action (uint4 f, const string &nm, const string &g)
	Base constructor for an Action. More...

virtual	~Action (void)
	Destructor.

virtual void	printStatistics (ostream &s) const
	Dump statistics to stream. More...

int4	perform (Funcdata &data)
	Perform this action (if necessary) More...

bool	setBreakPoint (uint4 tp, const string &specify)
	Set a breakpoint on this action. More...

virtual void	clearBreakPoints (void)
	Clear all breakpoints set on this Action.

bool	setWarning (bool val, const string &specify)
	Set a warning on this action. More...

bool	disableRule (const string &specify)
	Disable a specific Rule within this. More...

bool	enableRule (const string &specify)
	Enable a specific Rule within this. More...

const string &	getName (void) const
	Get the Action's name.

const string &	getGroup (void) const
	Get the Action's group.

uint4	getStatus (void) const
	Get the current status of this Action.

uint4	getNumTests (void)
	Get the number of times apply() was invoked.

uint4	getNumApply (void)

virtual void	reset (Funcdata &data)
	Reset the Action for a new function. More...

virtual void	resetStats (void)
	Reset all the counts to zero. More...

virtual int4	print (ostream &s, int4 num, int4 depth) const
	Print a description of this Action to stream. More...

virtual void	printState (ostream &s) const
	Print status to stream. More...

virtual Action *	getSubAction (const string &specify)
	Retrieve a specific sub-action by name. More...

virtual Rule *	getSubRule (const string &specify)
	Retrieve a specific sub-rule by name. More...

Private Member Functions
void	collectLaneSizes (Varnode *vn, const LanedRegister &allowedLanes, LanedRegister &checkLanes)
	Examine the PcodeOps using the given Varnode to determine possible lane sizes. More...

bool	processVarnode (Funcdata &data, Varnode *vn, const LanedRegister &lanedRegister, int4 mode)
	Search for a likely lane size and try to divide a single Varnode into these lanes. More...

Additional Inherited Members
Public Types inherited from ghidra::Action
enum	ruleflags { rule_repeatapply = 4, rule_onceperfunc = 8, rule_oneactperfunc = 16, rule_debug = 32, rule_warnings_on = 64, rule_warnings_given = 128 }
	Boolean behavior properties governing this particular Action. More...

enum	statusflags { status_start =1, status_breakstarthit =2, status_repeat =4, status_mid =8, status_end =16, status_actionbreak =32 }
	Boolean properties describing the status of an action. More...

enum	breakflags { break_start = 1, tmpbreak_start = 2, break_action = 4, tmpbreak_action = 8 }
	Break points associated with an Action. More...

Protected Member Functions inherited from ghidra::Action
void	issueWarning (Architecture *glb)
	Warn that this Action has applied. More...

bool	checkStartBreak (void)
	Check start breakpoint. More...

bool	checkActionBreak (void)
	Check action breakpoint. More...

void	turnOnWarnings (void)
	Enable warnings for this Action.

void	turnOffWarnings (void)
	Disable warnings for this Action.

Protected Attributes inherited from ghidra::Action
int4	lcount
	Changes not including last call to apply()

int4	count
	Number of changes made by this action so far.

uint4	status
	Current status.

uint4	breakpoint
	Breakpoint properties.

uint4	flags
	Behavior properties.

uint4	count_tests
	Number of times apply() has been called.

uint4	count_apply
	Number of times apply() made changes.

string	name
	Name of the action.

string	basegroup
	Base group this action belongs to.

Detailed Description

Find Varnodes with a vectorized lane scheme and attempt to split the lanes.

The Architecture lists (vector) registers that may be used to perform parallelized operations on lanes within the register. This action looks for these registers as Varnodes, determines if a particular lane scheme makes sense in terms of the function's data-flow, and then rewrites the data-flow so that the lanes become explicit Varnodes.

Member Function Documentation

◆ apply()

int4 ghidra::ActionLaneDivide::apply ( Funcdata & data )

virtual

Make a single attempt to apply this Action.

This is the main entry point for applying changes to a function that are specific to this Action. The method can inspect whatever it wants to decide if the Action does or does not apply. Changes are indicated by incrementing the count field.

Parameters

data	is the function to inspect/modify

Returns: 0 for a complete application, -1 for a partial completion (due to breakpoint)

Implements ghidra::Action.

References ghidra::Funcdata::beginLaneAccess(), ghidra::Funcdata::beginLoc(), ghidra::Funcdata::clearLanedAccessMap(), ghidra::Funcdata::endLaneAccess(), ghidra::Funcdata::endLoc(), and ghidra::Funcdata::setLanedRegGenerated().

◆ clone()

virtual Action* ghidra::ActionLaneDivide::clone ( const ActionGroupList & grouplist ) const

inlinevirtual

Clone the Action.

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

Parameters

grouplist is the list of groups being cloned

Returns: the cloned Action or NULL

Implements ghidra::Action.

References ghidra::ActionStart::apply(), ghidra::ActionGroupList::contains(), and ghidra::Action::getGroup().

◆ collectLaneSizes()

void ghidra::ActionLaneDivide::collectLaneSizes	(	Varnode *	vn,
		const LanedRegister &	allowedLanes,
		LanedRegister &	checkLanes
	)

private

Examine the PcodeOps using the given Varnode to determine possible lane sizes.

Run through the defining op and any descendant ops of the given Varnode, looking for CPUI_PIECE and CPUI_SUBPIECE. Use these to determine possible lane sizes and register them with the given LanedRegister object.

Parameters

vn	is the given Varnode
allowedLanes	is used to determine if a putative lane size is allowed
checkLanes	collects the possible lane sizes

References ghidra::LanedRegister::addLaneSize(), ghidra::LanedRegister::allowedLane(), ghidra::Varnode::beginDescend(), ghidra::PcodeOp::code(), ghidra::CPUI_PIECE, ghidra::CPUI_SUBPIECE, ghidra::Varnode::endDescend(), ghidra::Varnode::getDef(), ghidra::PcodeOp::getIn(), ghidra::PcodeOp::getOut(), ghidra::Varnode::getSize(), and ghidra::Varnode::isWritten().

◆ processVarnode()

bool ghidra::ActionLaneDivide::processVarnode	(	Funcdata &	data,
		Varnode *	vn,
		const LanedRegister &	lanedRegister,
		int4	mode
	)

private

Search for a likely lane size and try to divide a single Varnode into these lanes.

There are different ways to search for a lane size:

Mode 0: Collect putative lane sizes based on the local ops using the Varnode. Attempt to divide based on each of those lane sizes in turn.

Mode 1: Similar to mode 0, except we allow for SUBPIECE operations that truncate to variables that are smaller than the lane size.

Mode 2: Attempt to divide based on a default lane size.

Parameters

data	is the function being transformed
vn	is the given single Varnode
lanedRegister	is acceptable set of lane sizes for the Varnode
mode	is the lane size search mode (0, 1, or 2)

Returns: true if the Varnode (and its data-flow) was successfully split

References ghidra::LanedRegister::addLaneSize(), ghidra::LanedRegister::begin(), ghidra::LanedRegister::end(), and ghidra::LanedRegister::getWholeSize().

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

coreaction.hh
coreaction.cc

Public Member Functions

Private Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ apply()

◆ clone()

◆ collectLaneSizes()

◆ processVarnode()