decompiler  1.0.0
Public Member Functions | Static Private Member Functions | Friends | List of all members
ghidra::RuleLoadVarnode Class Reference

Convert LOAD operations using a constant offset to COPY. More...

Inheritance diagram for ghidra::RuleLoadVarnode:
ghidra::Rule

Public Member Functions

 RuleLoadVarnode (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 AddrSpacecorrectSpacebase (Architecture *glb, Varnode *vn, AddrSpace *spc)
 Return associated space if given Varnode is an active spacebase. More...
 
static AddrSpacevnSpacebase (Architecture *glb, Varnode *vn, uintb &val, AddrSpace *spc)
 Check if given Varnode is spacebase + a constant. More...
 
static AddrSpacecheckSpacebase (Architecture *glb, PcodeOp *op, uintb &offoff)
 Check if STORE or LOAD is off of a spacebase + constant. More...
 

Friends

class RuleStoreVarnode
 

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

Convert LOAD operations using a constant offset to COPY.

The pointer can either be a constant offset into the LOAD's specified address space, or it can be a spacebase register plus an offset, in which case it points into the spacebase register's address space.

Member Function Documentation

◆ applyOp()

int4 ghidra::RuleLoadVarnode::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 ghidra::Rule.

References ghidra::AddrSpace::addressToByte(), ghidra::Varnode::clearSpacebasePlaceholder(), ghidra::CPUI_COPY, ghidra::Funcdata::getArch(), ghidra::Funcdata::getCallSpecs(), ghidra::PcodeOp::getOut(), ghidra::Varnode::getSize(), ghidra::AddrSpace::getWordSize(), ghidra::Varnode::isSpacebasePlaceholder(), ghidra::Varnode::loneDescend(), ghidra::Funcdata::newVarnode(), ghidra::Funcdata::opRemoveInput(), ghidra::Funcdata::opSetInput(), ghidra::Funcdata::opSetOpcode(), and ghidra::FuncCallSpecs::resolveSpacebaseRelative().

◆ checkSpacebase()

AddrSpace * ghidra::RuleLoadVarnode::checkSpacebase ( Architecture glb,
PcodeOp op,
uintb &  offoff 
)
staticprivate

Check if STORE or LOAD is off of a spacebase + constant.

If so return the associated space and pass back the offset

Parameters
glbis the address space manager
opis the STORE or LOAD PcodeOp
offoffis a reference to where the offset should get passed back
Returns
the associated space or NULL

References ghidra::PcodeOp::code(), ghidra::CPUI_SEGMENTOP, ghidra::Varnode::getDef(), ghidra::PcodeOp::getIn(), ghidra::Varnode::getOffset(), ghidra::Varnode::getSpaceFromConst(), ghidra::Varnode::isConstant(), and ghidra::Varnode::isWritten().

Referenced by ghidra::RuleStoreVarnode::applyOp().

◆ clone()

virtual Rule* ghidra::RuleLoadVarnode::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(), and ghidra::AddTreeState::data.

◆ correctSpacebase()

AddrSpace * ghidra::RuleLoadVarnode::correctSpacebase ( Architecture glb,
Varnode vn,
AddrSpace spc 
)
staticprivate

Return associated space if given Varnode is an active spacebase.

The Varnode should be a spacebase register input to the function or a constant, and it should get loaded from the correct space.

Parameters
glbis the address space manager
vnis the given Varnode
spcis the address space being loaded from
Returns
the associated space or NULL if the Varnode is not of the correct form

References ghidra::Varnode::getAddr(), ghidra::AddrSpace::getContain(), ghidra::Varnode::getSize(), ghidra::Architecture::getSpaceBySpacebase(), ghidra::Varnode::isConstant(), ghidra::Varnode::isInput(), and ghidra::Varnode::isSpacebase().

◆ getOpList()

void ghidra::RuleLoadVarnode::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_LOAD.

◆ vnSpacebase()

AddrSpace * ghidra::RuleLoadVarnode::vnSpacebase ( Architecture glb,
Varnode vn,
uintb &  val,
AddrSpace spc 
)
staticprivate

Check if given Varnode is spacebase + a constant.

If it is, pass back the constant and return the associated space

Parameters
glbis the address space manager
vnis the given Varnode
valis the reference for passing back the constant
spcis the space being loaded from
Returns
the associated space or NULL

References ghidra::PcodeOp::code(), ghidra::CPUI_INT_ADD, ghidra::Varnode::getDef(), ghidra::PcodeOp::getIn(), ghidra::Varnode::getOffset(), ghidra::Varnode::isConstant(), and ghidra::Varnode::isWritten().


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