decompiler  1.0.0
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ghidra::RuleConditionalMove Class Reference

Simplify various conditional move situations. More...

Inheritance diagram for ghidra::RuleConditionalMove:
ghidra::Rule

Classes

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

Public Member Functions

 RuleConditionalMove (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 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 Private Member Functions

static VarnodeconstructNegate (Varnode *vn, PcodeOp *op, Funcdata &data)
 Construct the boolean negation of a given boolean Varnode. 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

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 ghidra::RuleConditionalMove::applyOp ( PcodeOp op,
Funcdata data 
)
virtual

◆ clone()

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

Implements ghidra::Rule.

References ghidra::ActionGroupList::contains().

◆ constructNegate()

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

Construct the boolean negation of a given boolean Varnode.

Parameters
vnis the given Varnode
opis the point at which to insert the BOOL_NEGATE op
datais the function being analyzed
Returns
the output of the new op

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

◆ getOpList()

void ghidra::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
oplistis the array to populate

Reimplemented from ghidra::Rule.

References ghidra::CPUI_MULTIEQUAL.


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