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RulePopcountBoolXor Class Reference

Simplify boolean expressions that are combined through POPCOUNT. More...

Inheritance diagram for RulePopcountBoolXor:
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Collaboration diagram for RulePopcountBoolXor:
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Public Member Functions

virtual Ruleclone (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 Public Member Functions

static VarnodegetBooleanResult (Varnode *vn, int4 bitPos, int4 &constRes)
 Extract boolean Varnode producing bit at given Varnode and position. 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 boolean expressions that are combined through POPCOUNT.

Expressions involving boolean values (b1 and b2) are converted, such as:

Member Function Documentation

◆ applyOp()

int4 RulePopcountBoolXor::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
opis the given PcodeOp where the Rule may apply
datais the function to which to apply

Reimplemented from Rule.

◆ clone()

virtual Rule* RulePopcountBoolXor::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
grouplistis the list of groups being cloned
Returns
the cloned Rule or NULL

Implements Rule.

◆ getBooleanResult()

Varnode * RulePopcountBoolXor::getBooleanResult ( Varnode vn,
int4  bitPos,
int4 &  constRes 
)
static

Extract boolean Varnode producing bit at given Varnode and position.

The boolean value may be shifted, extended and combined with other booleans through a series of operations. We return the Varnode that is the actual result of the boolean operation. If the given Varnode is constant, return null but pass back whether the given bit position is 0 or 1. If no boolean value can be found, return null and pass back -1.

Parameters
vnis the given Varnode containing the extended/shifted boolean
bitPosis the bit position of the desired boolean value
constResis used to pass back a constant boolean result
Returns
the boolean Varnode producing the desired value or null

◆ getOpList()

void RulePopcountBoolXor::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
oplistis the array to populate

Reimplemented from Rule.


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