Ghidra Decompiler Analysis Engine
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Simplify boolean expressions that are combined through POPCOUNT. 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 Public Member Functions | |
static Varnode * | getBooleanResult (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... | |
Simplify boolean expressions that are combined through POPCOUNT.
Expressions involving boolean values (b1 and b2) are converted, such as:
popcount((b1 << 6) | (b2 << 2)) & 1 => b1 ^ b2
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inlinevirtual |
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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.
vn | is the given Varnode containing the extended/shifted boolean |
bitPos | is the bit position of the desired boolean value |
constRes | is used to pass back a constant boolean result |
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virtual |