Finds and instruments individual LLVM IR instructions. More...

#include <IRDynamicChecks.cpp>

Inheritance diagram for Instrumenter:

Collaboration diagram for Instrumenter:

Public Member Functions
	Instrumenter (llvm::Module &module, std::shared_ptr< UtilityFunction > checker_function)
	Constructor. More...

virtual	~Instrumenter ()=default

bool	Inspect (llvm::Function &function)
	Inspect a function to find instructions to instrument. More...

bool	Instrument ()
	Instrument all the instructions found by Inspect() More...

Protected Types
typedef std::vector< llvm::Instruction * >	InstVector

typedef InstVector::iterator	InstIterator

Protected Member Functions
virtual bool	InstrumentInstruction (llvm::Instruction *inst)=0
	Add instrumentation to a single instruction. More...

void	RegisterInstruction (llvm::Instruction &inst)
	Register a single instruction to be instrumented. More...

virtual bool	InspectInstruction (llvm::Instruction &i)
	Determine whether a single instruction is interesting to instrument, and, if so, call RegisterInstruction. More...

virtual bool	InspectBasicBlock (llvm::BasicBlock &bb)
	Scan a basic block to see if any instructions are interesting. More...

virtual bool	InspectFunction (llvm::Function &f)
	Scan a function to see if any instructions are interesting. More...

llvm::FunctionCallee	BuildPointerValidatorFunc (lldb::addr_t start_address)
	Build a function pointer for a function with signature void ()(uint8_t) with a given address. More...

llvm::FunctionCallee	BuildObjectCheckerFunc (lldb::addr_t start_address)
	Build a function pointer for a function with signature void ()(uint8_t, uint8_t*) with a given address. More...

PointerType *	GetI8PtrTy ()

IntegerType *	GetIntptrTy ()

Protected Attributes
InstVector	m_to_instrument
	List of instructions the inspector found. More...

llvm::Module &	m_module
	The module which is being instrumented. More...

std::shared_ptr< UtilityFunction >	m_checker_function
	The dynamic checker function for the process. More...

Private Attributes
PointerType *	m_i8ptr_ty

IntegerType *	m_intptr_ty

Detailed Description

Finds and instruments individual LLVM IR instructions.

When instrumenting LLVM IR, it is frequently desirable to first search for instructions, and then later modify them. This way iterators remain intact, and multiple passes can look at the same code base without treading on each other's toes.

The Instrumenter class implements this functionality. A client first calls Inspect on a function, which populates a list of instructions to be instrumented. Then, later, when all passes' Inspect functions have been called, the client calls Instrument, which adds the desired instrumentation.

A subclass of Instrumenter must override InstrumentInstruction, which is responsible for adding whatever instrumentation is necessary.

A subclass of Instrumenter may override:

InspectInstruction [default: does nothing]
InspectBasicBlock [default: iterates through the instructions in a basic block calling InspectInstruction]
InspectFunction [default: iterates through the basic blocks in a function calling InspectBasicBlock]

Definition at line 133 of file IRDynamicChecks.cpp.

Member Typedef Documentation

◆ InstIterator

typedef InstVector::iterator Instrumenter::InstIterator

protected

Definition at line 298 of file IRDynamicChecks.cpp.

◆ InstVector

typedef std::vector<llvm::Instruction *> Instrumenter::InstVector

protected

Definition at line 297 of file IRDynamicChecks.cpp.

Constructor & Destructor Documentation

◆ Instrumenter()

Instrumenter::Instrumenter	(	llvm::Module &	module,
		std::shared_ptr< UtilityFunction >	checker_function
	)

inline

Constructor.

Parameters

[in] module The module being instrumented.

Definition at line 139 of file IRDynamicChecks.cpp.

◆ ~Instrumenter()

virtual Instrumenter::~Instrumenter ( )

virtualdefault

Member Function Documentation

◆ BuildObjectCheckerFunc()

llvm::FunctionCallee Instrumenter::BuildObjectCheckerFunc ( lldb::addr_t start_address )

inlineprotected

Build a function pointer for a function with signature void (*)(uint8_t*, uint8_t*) with a given address.

Parameters

[in] start_address The address of the function.

Returns: The function pointer, for use in a CallInst.

Definition at line 263 of file IRDynamicChecks.cpp.

◆ BuildPointerValidatorFunc()

llvm::FunctionCallee Instrumenter::BuildPointerValidatorFunc ( lldb::addr_t start_address )

inlineprotected

Build a function pointer for a function with signature void (*)(uint8_t*) with a given address.

Parameters

[in] start_address The address of the function.

Returns: The function pointer, for use in a CallInst.

Definition at line 240 of file IRDynamicChecks.cpp.

◆ GetI8PtrTy()

PointerType* Instrumenter::GetI8PtrTy ( )

inlineprotected

Definition at line 279 of file IRDynamicChecks.cpp.

◆ GetIntptrTy()

IntegerType* Instrumenter::GetIntptrTy ( )

inlineprotected

Definition at line 286 of file IRDynamicChecks.cpp.

◆ Inspect()

bool Instrumenter::Inspect ( llvm::Function & function )

inline

Inspect a function to find instructions to instrument.

Parameters

[in] function The function to inspect.

Returns: True on success; false on error.

Definition at line 153 of file IRDynamicChecks.cpp.

Referenced by lldb_private::IRDynamicChecks::runOnModule().

◆ InspectBasicBlock()

virtual bool Instrumenter::InspectBasicBlock ( llvm::BasicBlock & bb )

inlineprotectedvirtual

Scan a basic block to see if any instructions are interesting.

Parameters

[in] bb The basic block to be inspected.

Returns: False if there was an error scanning; true otherwise.

Definition at line 205 of file IRDynamicChecks.cpp.

◆ InspectFunction()

virtual bool Instrumenter::InspectFunction ( llvm::Function & f )

inlineprotectedvirtual

Scan a function to see if any instructions are interesting.

Parameters

[in] f The function to be inspected.

Returns: False if there was an error scanning; true otherwise.

Definition at line 222 of file IRDynamicChecks.cpp.

◆ InspectInstruction()

virtual bool Instrumenter::InspectInstruction ( llvm::Instruction & i )

inlineprotectedvirtual

Determine whether a single instruction is interesting to instrument, and, if so, call RegisterInstruction.

Parameters

[in] i The instruction to be inspected.

Returns: False if there was an error scanning; true otherwise.

Reimplemented in ObjcObjectChecker, and ValidPointerChecker.

Definition at line 196 of file IRDynamicChecks.cpp.

◆ Instrument()

bool Instrumenter::Instrument ( )

inline

Instrument all the instructions found by Inspect()

Returns: True on success; false on error.

Definition at line 159 of file IRDynamicChecks.cpp.

Referenced by lldb_private::IRDynamicChecks::runOnModule().

◆ InstrumentInstruction()

virtual bool Instrumenter::InstrumentInstruction ( llvm::Instruction * inst )

protectedpure virtual

Add instrumentation to a single instruction.

Parameters

[in] inst The instruction to be instrumented.

Returns: True on success; false otherwise.

Implemented in ObjcObjectChecker, and ValidPointerChecker.

◆ RegisterInstruction()

void Instrumenter::RegisterInstruction ( llvm::Instruction & inst )

inlineprotected

Register a single instruction to be instrumented.

Parameters

[in] inst The instruction to be instrumented.

Definition at line 184 of file IRDynamicChecks.cpp.

Member Data Documentation

◆ m_checker_function

std::shared_ptr<UtilityFunction> Instrumenter::m_checker_function

protected

The dynamic checker function for the process.

Definition at line 303 of file IRDynamicChecks.cpp.

◆ m_i8ptr_ty

PointerType* Instrumenter::m_i8ptr_ty

private

Definition at line 306 of file IRDynamicChecks.cpp.

◆ m_intptr_ty

IntegerType* Instrumenter::m_intptr_ty

private

Definition at line 307 of file IRDynamicChecks.cpp.

◆ m_module

llvm::Module& Instrumenter::m_module

protected

The module which is being instrumented.

Definition at line 301 of file IRDynamicChecks.cpp.

◆ m_to_instrument

InstVector Instrumenter::m_to_instrument

protected

List of instructions the inspector found.

Definition at line 300 of file IRDynamicChecks.cpp.

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

IRDynamicChecks.cpp

Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Private Attributes

Detailed Description

Member Typedef Documentation

◆ InstIterator

◆ InstVector

Constructor & Destructor Documentation

◆ Instrumenter()

◆ ~Instrumenter()

Member Function Documentation

◆ BuildObjectCheckerFunc()

◆ BuildPointerValidatorFunc()

◆ GetI8PtrTy()

◆ GetIntptrTy()

◆ Inspect()

◆ InspectBasicBlock()

◆ InspectFunction()

◆ InspectInstruction()

◆ Instrument()

◆ InstrumentInstruction()

◆ RegisterInstruction()

Member Data Documentation

◆ m_checker_function

◆ m_i8ptr_ty

◆ m_intptr_ty

◆ m_module

◆ m_to_instrument