clang: clang::ento::CheckerDocumentation Class Reference (original) (raw)

This checker documents the callback functions checkers can use to implement the custom handling of the specific events during path exploration as well as reporting bugs. More...

Public Member Functions
void	checkPreStmt (const ReturnStmt *DS, CheckerContext &C) const
	Pre-visit the Statement.

void	checkPostStmt (const DeclStmt *DS, CheckerContext &C) const
	Post-visit the Statement.

void	checkPreObjCMessage (const ObjCMethodCall &M, CheckerContext &C) const
	Pre-visit the Objective C message.

void	checkPostObjCMessage (const ObjCMethodCall &M, CheckerContext &C) const
	Post-visit the Objective C message.

void	checkObjCMessageNil (const ObjCMethodCall &M, CheckerContext &C) const
	Visit an Objective-C message whose receiver is nil.

void	checkPreCall (const CallEvent &Call, CheckerContext &C) const
	Pre-visit an abstract "call" event.

void	checkPostCall (const CallEvent &Call, CheckerContext &C) const
	Post-visit an abstract "call" event.

void	checkBranchCondition (const Stmt *Condition, CheckerContext &Ctx) const
	Pre-visit of the condition statement of a branch (such as IfStmt).

void	checkNewAllocator (const CXXAllocatorCall &, CheckerContext &) const
	Post-visit the C++ operator new's allocation call.

void	checkLocation (SVal Loc, bool IsLoad, const Stmt *S, CheckerContext &) const
	Called on a load from and a store to a location.

void	checkBind (SVal Loc, SVal Val, const Stmt *S, CheckerContext &) const
	Called on binding of a value to a location.

void	checkDeadSymbols (SymbolReaper &SR, CheckerContext &C) const
	Called whenever a symbol becomes dead.

void	checkBeginFunction (CheckerContext &Ctx) const
	Called when the analyzer core starts analyzing a function, regardless of whether it is analyzed at the top level or is inlined.

void	checkEndFunction (const ReturnStmt *RS, CheckerContext &Ctx) const
	Called when the analyzer core reaches the end of a function being analyzed regardless of whether it is analyzed at the top level or is inlined.

void	checkEndAnalysis (ExplodedGraph &G, BugReporter &BR, ExprEngine &Eng) const
	Called after all the paths in the ExplodedGraph reach end of path.

void	checkEndOfTranslationUnit (const TranslationUnitDecl *TU, AnalysisManager &Mgr, BugReporter &BR) const
	Called after analysis of a TranslationUnit is complete.

bool	evalCall (const CallEvent &Call, CheckerContext &C) const
	Evaluates function call.

ProgramStateRef	evalAssume (ProgramStateRef State, SVal Cond, bool Assumption) const
	Handles assumptions on symbolic values.

void	checkLiveSymbols (ProgramStateRef State, SymbolReaper &SR) const
	Allows modifying SymbolReaper object.

ProgramStateRef	checkRegionChanges (ProgramStateRef State, const InvalidatedSymbols Invalidated, ArrayRef< const MemRegion > ExplicitRegions, ArrayRef< const MemRegion * > Regions, const LocationContext LCtx, const CallEvent Call) const
	Called when the contents of one or more regions change.

ProgramStateRef	checkPointerEscape (ProgramStateRef State, const InvalidatedSymbols &Escaped, const CallEvent *Call, PointerEscapeKind Kind) const
	Called when pointers escape.

ProgramStateRef	checkConstPointerEscape (ProgramStateRef State, const InvalidatedSymbols &Escaped, const CallEvent *Call, PointerEscapeKind Kind) const
	Called when const pointers escape.

void	checkEvent (ImplicitNullDerefEvent Event) const
	check::Event

void	checkASTDecl (const FunctionDecl *D, AnalysisManager &Mgr, BugReporter &BR) const
	Check every declaration in the AST.

void	checkASTCodeBody (const Decl *D, AnalysisManager &Mgr, BugReporter &BR) const
	Check every declaration that has a statement body in the AST.

Public Member Functions inherited from clang::ento::CheckerBase
StringRef	getTagDescription () const override

CheckerNameRef	getCheckerName () const

virtual void	printState (raw_ostream &Out, ProgramStateRef State, const char NL, const char Sep) const
	See CheckerManager::runCheckersForPrintState.

Public Member Functions inherited from clang::ProgramPointTag
	ProgramPointTag (void *tagKind=nullptr)

virtual	~ProgramPointTag ()

virtual StringRef	getTagDescription () const =0

const void *	getTagKind () const
	Used to implement 'isKind' in subclasses.

Additional Inherited Members
Static Public Member Functions inherited from clang::ento::Checker< check::ASTCodeBody, check::ASTDecl< FunctionDecl >, check::BeginFunction, check::Bind, check::BranchCondition, check::ConstPointerEscape, check::DeadSymbols, check::EndAnalysis, check::EndFunction, check::EndOfTranslationUnit, check::Event< ImplicitNullDerefEvent >, check::LiveSymbols, check::Location, check::NewAllocator, check::ObjCMessageNil, check::PointerEscape, check::PostCall, check::PostObjCMessage, check::PostStmt< DeclStmt >, check::PreCall, check::PreObjCMessage, check::PreStmt< ReturnStmt >, check::RegionChanges, eval::Assume, eval::Call >
static void	_register (CHECKER *checker, CheckerManager &mgr)

Static Public Member Functions inherited from clang::ento::check::ASTCodeBody
template<typename CHECKER >
static void	_register (CHECKER *checker, CheckerManager &mgr)

This checker documents the callback functions checkers can use to implement the custom handling of the specific events during path exploration as well as reporting bugs.

Most of the callbacks are targeted at path-sensitive checking.

◆ checkASTCodeBody()

Check every declaration that has a statement body in the AST.

As AST traversal callback, which should only be used when the checker is not path sensitive. It will be called for every Declaration in the AST.

Definition at line 335 of file CheckerDocumentation.cpp.

◆ checkASTDecl()

Check every declaration in the AST.

An AST traversal callback, which should only be used when the checker is not path sensitive. It will be called for every Declaration in the AST and can be specialized to only be called on subclasses of Decl, for example, FunctionDecl.

check::ASTDecl

Definition at line 327 of file CheckerDocumentation.cpp.

◆ checkBeginFunction()

void clang::ento::CheckerDocumentation::checkBeginFunction ( CheckerContext & Ctx) const	inline

◆ checkBind()

Called on binding of a value to a location.

Parameters

Loc	The value of the location (pointer).
Val	The value which will be stored at the location Loc.
S	The bind is performed while processing the statement S.

check::Bind

Definition at line 167 of file CheckerDocumentation.cpp.

◆ checkBranchCondition()

void clang::ento::CheckerDocumentation::checkBranchCondition ( const Stmt * Condition, CheckerContext & Ctx ) const	inline

◆ checkConstPointerEscape()

◆ checkDeadSymbols()

Called whenever a symbol becomes dead.

This callback should be used by the checkers to aggressively clean up/reduce the checker state, which is important for reducing the overall memory usage. Specifically, if a checker keeps symbol specific information in the state, it can and should be dropped after the symbol becomes dead. In addition, reporting a bug as soon as the checker becomes dead leads to more precise diagnostics. (For example, one should report that a malloced variable is not freed right after it goes out of scope.)

Parameters

SR	The SymbolReaper object can be queried to determine which symbols are dead.

check::DeadSymbols

Definition at line 183 of file CheckerDocumentation.cpp.

◆ checkEndAnalysis()

Called after all the paths in the ExplodedGraph reach end of path.

the symbolic execution graph is fully explored.

This callback should be used in cases when a checker needs to have a global view of the information generated on all paths. For example, to compare execution summary/result several paths. See IdempotentOperationChecker for a usage example.

check::EndAnalysis

Definition at line 208 of file CheckerDocumentation.cpp.

◆ checkEndFunction()

◆ checkEndOfTranslationUnit()

◆ checkEvent()

◆ checkLiveSymbols()

◆ checkLocation()

Called on a load from and a store to a location.

The method will be called each time a location (pointer) value is accessed.

Parameters

Loc	The value of the location (pointer).
IsLoad	The flag specifying if the location is a store or a load.
S	The load is performed while processing the statement.

check::Location

Definition at line 157 of file CheckerDocumentation.cpp.

◆ checkNewAllocator()

Post-visit the C++ operator new's allocation call.

Execution of C++ operator new consists of the following phases: (1) call default or overridden operator new() to allocate memory (2) cast the return value of operator new() from void pointer type to class pointer type, (3) assuming that the value is non-null, call the object's constructor over this pointer, (4) declare that the value of the new-expression is this pointer. This callback is called between steps (2) and (3). Post-call for the allocator is called after step (1). Pre-statement for the new-expression is called on step (4) when the value of the expression is evaluated.

Definition at line 146 of file CheckerDocumentation.cpp.

◆ checkObjCMessageNil()

Visit an Objective-C message whose receiver is nil.

This will be called when the analyzer core processes a method call whose receiver is definitely nil. In this case, check{Pre/Post}ObjCMessage and check{Pre/Post}Call will not be called.

check::ObjCMessageNil

Definition at line 112 of file CheckerDocumentation.cpp.

◆ checkPointerEscape()

Called when pointers escape.

This notifies the checkers about pointer escape, which occurs whenever the analyzer cannot track the symbol any more. For example, as a result of assigning a pointer into a global or when it's passed to a function call the analyzer cannot model.

Parameters

State	The state at the point of escape.
Escaped	The list of escaped symbols.
Call	The corresponding CallEvent, if the symbols escape as parameters to the given call.
Kind	How the symbols have escaped.

Returns

Checkers can modify the state by returning a new state.

Definition at line 298 of file CheckerDocumentation.cpp.

◆ checkPostCall()

◆ checkPostObjCMessage()

◆ checkPostStmt()

Post-visit the Statement.

The method will be called after the analyzer core processes the statement. The notification is performed for every explored CFGElement, which does not include the control flow statements such as IfStmt. The callback can be specialized to be called with any subclass of Stmt.

check::PostStmt

Definition at line 339 of file CheckerDocumentation.cpp.

◆ checkPreCall()

Pre-visit an abstract "call" event.

This is used for checkers that want to check arguments or attributed behavior for functions and methods no matter how they are being invoked.

Note that this includes ALL cross-body invocations, so if you want to limit your checks to, say, function calls, you should test for that at the beginning of your callback function.

check::PreCall

Definition at line 124 of file CheckerDocumentation.cpp.

◆ checkPreObjCMessage()

Pre-visit the Objective C message.

This will be called before the analyzer core processes the method call. This is called for any action which produces an Objective-C message send, including explicit message syntax and property access.

check::PreObjCMessage

Definition at line 97 of file CheckerDocumentation.cpp.

◆ checkPreStmt()

Pre-visit the Statement.

The method will be called before the analyzer core processes the statement. The notification is performed for every explored CFGElement, which does not include the control flow statements such as IfStmt. The callback can be specialized to be called with any subclass of Stmt.

See checkBranchCondition() callback for performing custom processing of the branching statements.

check::PreStmt

Definition at line 78 of file CheckerDocumentation.cpp.

◆ checkRegionChanges()

Called when the contents of one or more regions change.

This can occur in many different ways: an explicit bind, a blanket invalidation of the region contents, or by passing a region to a function call whose behavior the analyzer cannot model perfectly.

Parameters

State	The current program state.
Invalidated	A set of all symbols potentially touched by the change.
ExplicitRegions	The regions explicitly requested for invalidation. For a function call, this would be the arguments. For a bind, this would be the region being bound to.
Regions	The transitive closure of regions accessible from, ExplicitRegions, i.e. all regions that may have been touched by this change. For a simple bind, this list will be the same as ExplicitRegions, since a bind does not affect the contents of anything accessible through the base region.
LCtx	LocationContext that is useful for getting various contextual info, like callstack, CFG etc.
Call	The opaque call triggering this invalidation. Will be 0 if the change was not triggered by a call.

check::RegionChanges

Definition at line 276 of file CheckerDocumentation.cpp.

◆ evalAssume()

Handles assumptions on symbolic values.

This method is called when a symbolic expression is assumed to be true or false. For example, the assumptions are performed when evaluating a condition at a branch. The callback allows checkers track the assumptions performed on the symbols of interest and change the state accordingly.

eval::Assume

Definition at line 242 of file CheckerDocumentation.cpp.

◆ evalCall()

Evaluates function call.

The analysis core treats all function calls in the same way. However, some functions have special meaning, which should be reflected in the program state. This callback allows a checker to provide domain specific knowledge about the particular functions it knows about.

Returns

true if the call has been successfully evaluated and false otherwise. Note, that only one checker can evaluate a call. If more than one checker claims that they can evaluate the same call the first one wins.

eval::Call

Definition at line 232 of file CheckerDocumentation.cpp.

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

lib/StaticAnalyzer/Checkers/CheckerDocumentation.cpp