Commute SUBPIECE operations with earlier operations where possible. More...

Inheritance diagram for ghidra::RuleSubCommute:

Public Member Functions
	RuleSubCommute (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 ghidra::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	clearBreakPoints (void)
	Clear all breakpoints 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 bool	cancelExtensions (PcodeOp longform, PcodeOp subOp, Varnode ext0In, Varnode ext1In, Funcdata &data)
	Eliminate input extensions on given binary PcodeOp. More...

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

Detailed Description

Commute SUBPIECE operations with earlier operations where possible.

A SUBPIECE conmmutes with long and short forms of many operations. We try to push SUBPIECE earlier in the expression trees (preferring short versions of ops over long) in the hopes that the SUBPIECE will run into a constant, a INT_SEXT, or a INT_ZEXT, canceling out

Member Function Documentation

◆ applyOp()

int4 ghidra::RuleSubCommute::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 ghidra::Rule.

References ghidra::calc_mask(), ghidra::PcodeOp::code(), ghidra::CPUI_INT_ADD, ghidra::CPUI_INT_AND, ghidra::CPUI_INT_DIV, ghidra::CPUI_INT_LEFT, ghidra::CPUI_INT_MULT, ghidra::CPUI_INT_NEGATE, ghidra::CPUI_INT_OR, ghidra::CPUI_INT_REM, ghidra::CPUI_INT_SDIV, ghidra::CPUI_INT_SEXT, ghidra::CPUI_INT_SREM, ghidra::CPUI_INT_XOR, ghidra::CPUI_INT_ZEXT, ghidra::CPUI_PIECE, ghidra::CPUI_SUBPIECE, ghidra::PcodeOp::getAddr(), ghidra::Varnode::getDef(), ghidra::PcodeOp::getIn(), ghidra::Varnode::getOffset(), ghidra::PcodeOp::getOut(), ghidra::Varnode::getSize(), ghidra::Varnode::isConstant(), ghidra::Varnode::isPrecisHi(), ghidra::Varnode::isPrecisLo(), ghidra::Varnode::isSpacebase(), ghidra::Varnode::isWritten(), ghidra::Varnode::loneDescend(), ghidra::Funcdata::newConstant(), ghidra::Funcdata::newOp(), ghidra::Funcdata::newUniqueOut(), ghidra::PcodeOp::numInput(), ghidra::Funcdata::opDestroy(), ghidra::Funcdata::opInsertBefore(), ghidra::Funcdata::opSetInput(), ghidra::Funcdata::opSetOpcode(), and ghidra::Funcdata::opSetOutput().

◆ cancelExtensions()

bool ghidra::RuleSubCommute::cancelExtensions	(	PcodeOp *	longform,
		PcodeOp *	subOp,
		Varnode *	ext0In,
		Varnode *	ext1In,
		Funcdata &	data
	)

static

Eliminate input extensions on given binary PcodeOp.

Make some basic checks. Replace the input and output Varnodes with smaller sizes.

Parameters

longform	is the given binary PcodeOp to modify
subOp	is the PcodeOp truncating the output of longform
ext0In	is the first input Varnode before the extension
ext1In	is the second input Varnode before the extension
data	is the function being analyzed