Perform Common Sub-expression Elimination on CPUI_MULTIEQUAL ops. More...

#include <coreaction.hh>

Inheritance diagram for ActionMultiCse:

Public Member Functions
	ActionMultiCse (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 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 void	saveXml (ostream &s) const
	Save specifics of this action to stream.

virtual void	restoreXml (const Element el, Funcdata fd)
	Load specifics of action from XML.

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
bool	processBlock (Funcdata &data, BlockBasic *bl)
	Search a block for equivalent CPUI_MULTIEQUAL. More...

Static Private Member Functions
static bool	preferredOutput (Varnode out1, Varnode out2)
	Which of two outputs is preferred. More...

static PcodeOp *	findMatch (BlockBasic bl, PcodeOp target, Varnode *in)
	Find match to CPUI_MULTIEQUAL. More...

Additional Inherited Members
Public Types inherited from 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 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 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

Perform Common Sub-expression Elimination on CPUI_MULTIEQUAL ops.

Member Function Documentation

int4 ActionMultiCse::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 Action.

References Funcdata::getBasicBlocks(), and BlockGraph::getSize().

virtual Action* ActionMultiCse::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 Action.

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

PcodeOp * ActionMultiCse::findMatch	(	BlockBasic *	bl,
		PcodeOp *	target,
		Varnode *	in
	)

staticprivate

Find match to CPUI_MULTIEQUAL.

Find any matching CPUI_MULTIEQUAL that occurs before target that has in as an input. Then test to see if the target and the recovered op are functionally equivalent.

Parameters

bl	is the parent block
target	is the given target CPUI_MULTIEQUAL
in	is the specific input Varnode

References BlockBasic::beginOp(), PcodeOp::code(), CPUI_COPY, functionalEqualityLevel(), Varnode::getDef(), PcodeOp::getIn(), Varnode::isWritten(), and PcodeOp::numInput().

bool ActionMultiCse::preferredOutput	(	Varnode *	out1,
		Varnode *	out2
	)

staticprivate

Which of two outputs is preferred.

We are substituting either -out1- for -out2- OR -out2- for -out1- Return true if we prefer substituting -out2- for -out1-

Parameters

out1	is one output
out2	is the other output

Returns: preference

References Varnode::beginDescend(), PcodeOp::code(), CPUI_RETURN, Varnode::endDescend(), Varnode::getSpace(), AddrSpace::getType(), IPTR_INTERNAL, and Varnode::isAddrTied().

bool ActionMultiCse::processBlock	(	Funcdata &	data,
		BlockBasic *	bl
	)

private

Search a block for equivalent CPUI_MULTIEQUAL.

Search for pairs of CPUI_MULTIEQUAL ops in bl that share an input. If the pairs found are functionally equivalent, delete one of the two.

Parameters

data	is the function owning the block
bl	is the specific basic block return true if a CPUI_MULTIEQUAL was (successfully) deleted

References BlockBasic::beginOp(), PcodeOp::code(), CPUI_COPY, CPUI_MULTIEQUAL, BlockBasic::endOp(), Varnode::getDef(), PcodeOp::getIn(), PcodeOp::getOut(), Varnode::isMark(), Varnode::isWritten(), PcodeOp::numInput(), Funcdata::opDestroy(), and Funcdata::totalReplace().

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

coreaction.hh
coreaction.cc

Public Member Functions

Private Member Functions

Static Private Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation