decompiler  1.0.0
Public Member Functions | Static Private Member Functions | List of all members
RuleSLess2Zero Class Reference

Simplify INT_SLESS applied to 0 or -1. More...

Inheritance diagram for RuleSLess2Zero:
Rule

Public Member Functions

 RuleSLess2Zero (const string &g)
 Constructor.
 
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...
 
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 Private Member Functions

static VarnodegetHiBit (PcodeOp *op)
 Get the piece containing the sign-bit. 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 INT_SLESS applied to 0 or -1.

Forms include:

There is a second set of forms where one side of the comparison is built out of a high and low piece, where the high piece determines the sign bit:

Member Function Documentation

int4 RuleSLess2Zero::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.

References calc_mask(), PcodeOp::code(), CPUI_INT_AND, CPUI_INT_EQUAL, CPUI_INT_MULT, CPUI_INT_NEGATE, CPUI_INT_NOTEQUAL, CPUI_PIECE, CPUI_SUBPIECE, Varnode::getDef(), PcodeOp::getIn(), Varnode::getOffset(), Varnode::getSize(), Varnode::isConstant(), Varnode::isFree(), Varnode::isWritten(), Varnode::loneDescend(), Funcdata::newConstant(), Funcdata::opSetInput(), and Funcdata::opSetOpcode().

virtual Rule* RuleSLess2Zero::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.

References ActionGroupList::contains(), and AddTreeState::data.

Varnode * RuleSLess2Zero::getHiBit ( PcodeOp op)
staticprivate

Get the piece containing the sign-bit.

If the given PcodeOp pieces together 2 Varnodes only one of which is determining the high bit, return that Varnode.

Parameters
opis the given PcodeOp
Returns
the Varnode holding the high bit

References calc_mask(), PcodeOp::code(), CPUI_INT_ADD, CPUI_INT_OR, CPUI_INT_XOR, PcodeOp::getIn(), Varnode::getNZMask(), and Varnode::getSize().

void RuleSLess2Zero::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.

References CPUI_INT_SLESS.


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