#include "llvm/CodeGen/StackProtector.h"

Inheritance diagram for llvm::StackProtector:

Public Member Functions
	StackProtector ()

void	getAnalysisUsage (AnalysisUsage &AU) const override
	getAnalysisUsage - This function should be overriden by passes that need analysis information to do their job.

bool	shouldEmitSDCheck (const BasicBlock &BB) const

bool	runOnFunction (Function &Fn) override
	runOnFunction - Virtual method overriden by subclasses to do the per-function processing of the pass.

void	copyToMachineFrameInfo (MachineFrameInfo &MFI) const

Public Member Functions inherited from llvm::FunctionPass
	FunctionPass (char &pid)

Pass *	createPrinterPass (raw_ostream &OS, const std::string &Banner) const override
	createPrinterPass - Get a function printer pass.

virtual bool	runOnFunction (Function &F)=0
	runOnFunction - Virtual method overriden by subclasses to do the per-function processing of the pass.

void	assignPassManager (PMStack &PMS, PassManagerType T) override
	Find appropriate Function Pass Manager or Call Graph Pass Manager in the PM Stack and add self into that manager.

PassManagerType	getPotentialPassManagerType () const override
	Return what kind of Pass Manager can manage this pass.

Public Member Functions inherited from llvm::Pass
	Pass (PassKind K, char &pid)

	Pass (const Pass &)=delete

Pass &	operator= (const Pass &)=delete

virtual	~Pass ()

PassKind	getPassKind () const

virtual StringRef	getPassName () const
	getPassName - Return a nice clean name for a pass.

AnalysisID	getPassID () const
	getPassID - Return the PassID number that corresponds to this pass.

virtual bool	doInitialization (Module &)
	doInitialization - Virtual method overridden by subclasses to do any necessary initialization before any pass is run.

virtual bool	doFinalization (Module &)
	doFinalization - Virtual method overriden by subclasses to do any necessary clean up after all passes have run.

virtual void	print (raw_ostream &OS, const Module *M) const
	print - Print out the internal state of the pass.

void	dump () const

virtual Pass *	createPrinterPass (raw_ostream &OS, const std::string &Banner) const =0
	createPrinterPass - Get a Pass appropriate to print the IR this pass operates on (Module, Function or MachineFunction).

virtual void	assignPassManager (PMStack &, PassManagerType)
	Each pass is responsible for assigning a pass manager to itself.

virtual void	preparePassManager (PMStack &)
	Check if available pass managers are suitable for this pass or not.

virtual PassManagerType	getPotentialPassManagerType () const
	Return what kind of Pass Manager can manage this pass.

void	setResolver (AnalysisResolver *AR)

AnalysisResolver *	getResolver () const

virtual void	getAnalysisUsage (AnalysisUsage &) const
	getAnalysisUsage - This function should be overriden by passes that need analysis information to do their job.

virtual void	releaseMemory ()
	releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memory when it is no longer needed.

virtual void *	getAdjustedAnalysisPointer (AnalysisID ID)
	getAdjustedAnalysisPointer - This method is used when a pass implements an analysis interface through multiple inheritance.

virtual ImmutablePass *	getAsImmutablePass ()

virtual PMDataManager *	getAsPMDataManager ()

virtual void	verifyAnalysis () const
	verifyAnalysis() - This member can be implemented by a analysis pass to check state of analysis information.

virtual void	dumpPassStructure (unsigned Offset=0)

template<typename AnalysisType >
AnalysisType *	getAnalysisIfAvailable () const
	getAnalysisIfAvailable<AnalysisType>() - Subclasses use this function to get analysis information that might be around, for example to update it.

bool	mustPreserveAnalysisID (char &AID) const
	mustPreserveAnalysisID - This method serves the same function as getAnalysisIfAvailable, but works if you just have an AnalysisID.

template<typename AnalysisType >
AnalysisType &	getAnalysis () const
	getAnalysis<AnalysisType>() - This function is used by subclasses to get to the analysis information that they claim to use by overriding the getAnalysisUsage function.

template<typename AnalysisType >
AnalysisType &	getAnalysis (Function &F, bool *Changed=nullptr)
	getAnalysis<AnalysisType>() - This function is used by subclasses to get to the analysis information that they claim to use by overriding the getAnalysisUsage function.

template<typename AnalysisType >
AnalysisType &	getAnalysisID (AnalysisID PI) const

template<typename AnalysisType >
AnalysisType &	getAnalysisID (AnalysisID PI, Function &F, bool *Changed=nullptr)

Static Public Member Functions
static bool	requiresStackProtector (Function F, SSPLayoutMap Layout=nullptr)
	Check whether or not `F` needs a stack protector based upon the stack protector level.

Static Public Member Functions inherited from llvm::Pass
static const PassInfo *	lookupPassInfo (const void *TI)

static const PassInfo *	lookupPassInfo (StringRef Arg)

static Pass *	createPass (AnalysisID ID)

Static Public Attributes
static char	ID = 0

Additional Inherited Members
Protected Member Functions inherited from llvm::FunctionPass
bool	skipFunction (const Function &F) const
	Optional passes call this function to check whether the pass should be skipped.

Detailed Description

Definition at line 34 of file StackProtector.h.

Constructor & Destructor Documentation

◆ StackProtector()

StackProtector::StackProtector ( )

Definition at line 69 of file StackProtector.cpp.

References llvm::PassRegistry::getPassRegistry(), and llvm::initializeStackProtectorPass().

Member Function Documentation

◆ copyToMachineFrameInfo()

void StackProtector::copyToMachineFrameInfo ( MachineFrameInfo & MFI ) const

Definition at line 642 of file StackProtector.cpp.

References E, llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::empty(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::end(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::find(), llvm::MachineFrameInfo::getObjectAllocation(), llvm::MachineFrameInfo::getObjectIndexEnd(), I, llvm::MachineFrameInfo::isDeadObjectIndex(), and llvm::MachineFrameInfo::setObjectSSPLayout().

Referenced by llvm::IRTranslator::runOnMachineFunction().

◆ getAnalysisUsage()

void StackProtector::getAnalysisUsage ( AnalysisUsage & ) const

overridevirtual

getAnalysisUsage - This function should be overriden by passes that need analysis information to do their job.

If a pass specifies that it uses a particular analysis result to this function, it can then use the getAnalysis<AnalysisType>() function, below.

Reimplemented from llvm::Pass.

Definition at line 82 of file StackProtector.cpp.

References llvm::AnalysisUsage::addPreserved(), and llvm::AnalysisUsage::addRequired().

◆ requiresStackProtector()

bool StackProtector::requiresStackProtector	(	Function *	F,
		SSPLayoutMap *	Layout = `nullptr`
	)

static

Check whether or not F needs a stack protector based upon the stack protector level.

Check whether or not this function needs a stack protector based upon the stack protector level.

We use two heuristics: a standard (ssp) and strong (sspstrong). The standard heuristic which will add a guard variable to functions that call alloca with a either a variable size or a size >= SSPBufferSize, functions with character buffers larger than SSPBufferSize, and functions with aggregates containing character buffers larger than SSPBufferSize. The strong heuristic will add a guard variables to functions that call alloca regardless of size, functions with any buffer regardless of type and size, functions with aggregates that contain any buffer regardless of type and size, and functions that contain stack-based variables that have had their address taken.

Definition at line 288 of file StackProtector.cpp.

References llvm::SmallPtrSetImplBase::clear(), ContainsProtectableArray(), DEBUG_TYPE, llvm::OptimizationRemarkEmitter::emit(), F, HasAddressTaken(), I, llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::insert(), llvm::MachineFrameInfo::SSPLK_AddrOf, llvm::MachineFrameInfo::SSPLK_LargeArray, and llvm::MachineFrameInfo::SSPLK_SmallArray.