RuleConditionalMove Class Reference

Simplify various conditional move situations. More...

Inheritance diagram for RuleConditionalMove:

Classes
class	BoolExpress
	Class for categorizing and rebuilding a boolean expression. More...

Public Member Functions
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...
bool	checkActionBreak (void)
	Check if an action breakpoint is turned on. More...
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 Private Member Functions
static Varnode *	constructNegate (Varnode *vn, PcodeOp *op, Funcdata &data)
	Construct the boolean negation of a given boolean Varnode. 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

Simplify various conditional move situations.

The simplest situation is when the code looks like

if (boolcond)
  res0 = 1;
else
  res1 = 0;
res = ? res0 : res1

which gets simplified to res = zext(boolcond) The other major variation looks like

if (boolcond)
   res0 = boolcond;
else
   res1 = differentcond;
res = ? res0 : res1

which gets simplified to res = boolcond || differentcond

Member Function Documentation

applyOp()

int4 RuleConditionalMove::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 RuleConditionalMove::BoolExpress::constructBool(), constructNegate(), CPUI_BOOL_AND, CPUI_BOOL_NEGATE, CPUI_BOOL_OR, CPUI_CBRANCH, CPUI_COPY, CPUI_INT_ZEXT, RuleConditionalMove::BoolExpress::evaluatePropagation(), RuleConditionalMove::BoolExpress::initialize(), PcodeOp::isBooleanFlip(), Funcdata::newConstant(), Funcdata::opInsertBegin(), Funcdata::opRemoveInput(), Funcdata::opSetInput(), Funcdata::opSetOpcode(), and Funcdata::opUninsert().

clone()

virtual Rule* RuleConditionalMove::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().

constructNegate()

Varnode * RuleConditionalMove::constructNegate ( Varnode *  vn, PcodeOp *  op, Funcdata &  data  )

staticprivate

Construct the boolean negation of a given boolean Varnode.

Parameters

vn	is the given Varnode
op	is the point at which to insert the BOOL_NEGATE op
data	is the function being analyzed

Returns

the output of the new op

References CPUI_BOOL_NEGATE, Funcdata::newOp(), Funcdata::newUniqueOut(), Funcdata::opInsertBefore(), Funcdata::opSetInput(), and Funcdata::opSetOpcode().

Referenced by applyOp().

getOpList()

void RuleConditionalMove::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_MULTIEQUAL.

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

• ruleaction.hh
• ruleaction.cc