lldb_private::IRDynamicChecks Class Reference

"lldb/Expression/IRDynamicChecks.h" Adds dynamic checks to a user-entered expression to reduce its likelihood of crashing More...

#include <IRDynamicChecks.h>

Inheritance diagram for lldb_private::IRDynamicChecks:

Public Member Functions
	IRDynamicChecks (ClangDynamicCheckerFunctions &checker_functions, const char *func_name="$__lldb_expr")
	Constructor.
	~IRDynamicChecks () override
	Destructor.
bool	runOnModule (llvm::Module &M) override
	Run this IR transformer on a single module.
void	assignPassManager (llvm::PMStack &PMS, llvm::PassManagerType T=llvm::PMT_ModulePassManager) override
	Interface stub.
llvm::PassManagerType	getPotentialPassManagerType () const override
	Returns PMT_ModulePassManager.

Private Member Functions
bool	FindDataLoads (llvm::Module &M, llvm::BasicBlock &BB)
	A basic block-level pass to find all pointer dereferences and validate them before use.

Private Attributes
std::string	m_func_name
	The name of the function to add checks to.
ClangDynamicCheckerFunctions &	m_checker_functions
	The checker functions for the process.

Detailed Description

"lldb/Expression/IRDynamicChecks.h" Adds dynamic checks to a user-entered expression to reduce its likelihood of crashing

When an IR function is executed in the target process, it may cause crashes or hangs by dereferencing NULL pointers, trying to call Objective-C methods on objects that do not respond to them, and so forth.

IRDynamicChecks adds calls to the functions in DynamicCheckerFunctions to appropriate locations in an expression's IR.

Definition at line 70 of file IRDynamicChecks.h.

Constructor & Destructor Documentation

IRDynamicChecks()

IRDynamicChecks::IRDynamicChecks	(	ClangDynamicCheckerFunctions &	checker_functions,
		const char *	func_name = "$__lldb_expr"
	)

Constructor.

Parameters

[in]	checker_functions	The checker functions for the target process.
[in]	func_name	The name of the function to prepare for execution in the target.

Definition at line 513 of file IRDynamicChecks.cpp.

~IRDynamicChecks()

IRDynamicChecks::~IRDynamicChecks ( )

overridedefault

Destructor.

Member Function Documentation

assignPassManager()

void IRDynamicChecks::assignPassManager ( llvm::PMStack &  PMS, llvm::PassManagerType  T = llvm::PMT_ModulePassManager  )

override

Interface stub.

Definition at line 565 of file IRDynamicChecks.cpp.

FindDataLoads()

bool lldb_private::IRDynamicChecks::FindDataLoads ( llvm::Module &  M, llvm::BasicBlock &  BB  )

private

A basic block-level pass to find all pointer dereferences and validate them before use.

The top-level pass implementation

Parameters

[in]	M	The module currently being processed.
[in]	BB	The basic block currently being processed.

Returns

True on success; false otherwise

getPotentialPassManagerType()

PassManagerType IRDynamicChecks::getPotentialPassManagerType ( ) const

override

Returns PMT_ModulePassManager.

Definition at line 567 of file IRDynamicChecks.cpp.

runOnModule()

bool IRDynamicChecks::runOnModule ( llvm::Module &  M )

override

Run this IR transformer on a single module.

Parameters

[in]

M

The module to run on. This module is searched for the function $__lldb_expr, and that function is passed to the passes one by one.

Returns

True on success; false otherwise

Definition at line 520 of file IRDynamicChecks.cpp.

References lldb_private::Expressions, lldb_private::GetLog(), lldb_private::Log::GetVerbose(), Instrumenter::Inspect(), Instrumenter::Instrument(), LLDB_LOGF, m_checker_functions, m_func_name, lldb_private::ClangDynamicCheckerFunctions::m_objc_object_check, and lldb_private::ClangDynamicCheckerFunctions::m_valid_pointer_check.

Referenced by lldb_private::ClangExpressionParser::PrepareForExecution().

Member Data Documentation

m_checker_functions

ClangDynamicCheckerFunctions& lldb_private::IRDynamicChecks::m_checker_functions

private

The checker functions for the process.

Definition at line 122 of file IRDynamicChecks.h.

Referenced by runOnModule().

m_func_name

std::string lldb_private::IRDynamicChecks::m_func_name

private

The name of the function to add checks to.

Definition at line 120 of file IRDynamicChecks.h.

Referenced by runOnModule().

---

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

• IRDynamicChecks.h
• IRDynamicChecks.cpp