A CallDescription is a pattern that can be used to match calls based on the qualified name and the argument/parameter counts. More...

#include "clang/StaticAnalyzer/Core/PathSensitive/CallDescription.h"

Public Types
enum class	Mode { CLibrary , CLibraryMaybeHardened , SimpleFunc , CXXMethod , Unspecified }

Public Member Functions
	CallDescription (Mode MatchAs, ArrayRef< StringRef > QualifiedName, MaybeCount RequiredArgs=std::nullopt, MaybeCount RequiredParams=std::nullopt)
	Constructs a CallDescription object. More...

StringRef	getFunctionName () const
	Get the name of the function that this object matches. More...

auto	begin_qualified_name_parts () const
	Get the qualified name parts in reversed order. More...

auto	end_qualified_name_parts () const

bool	hasQualifiedNameParts () const
	It's false, if and only if we expect a single identifier, such as `getenv`. More...

Friends
class	CallEvent

Matching CallDescriptions against a CallEvent
bool	matchesAny (const CallEvent &Call, const CallDescription &CD1)
	Returns true whether the CallEvent matches on any of the CallDescriptions supplied. More...

template<typename... Ts>
bool	matchesAny (const CallEvent &Call, const CallDescription &CD1, const Ts &...CDs)
	Returns true whether the CallEvent matches on any of the CallDescriptions supplied. More...

bool	matches (const CallEvent &Call) const
	Returns true if the CallEvent is a call to a function that matches the CallDescription. More...

Matching CallDescriptions against a CallExpr
bool	matchesAnyAsWritten (const CallExpr &CE, const CallDescription &CD1)
	Returns true whether the CallExpr matches on any of the CallDescriptions supplied. More...

template<typename... Ts>
bool	matchesAnyAsWritten (const CallExpr &CE, const CallDescription &CD1, const Ts &...CDs)
	Returns true whether the CallExpr matches on any of the CallDescriptions supplied. More...

bool	matchesAsWritten (const CallExpr &CE) const
	Returns true if the CallExpr is a call to a function that matches the CallDescription. More...

Detailed Description

A CallDescription is a pattern that can be used to match calls based on the qualified name and the argument/parameter counts.

Definition at line 32 of file CallDescription.h.

Member Enumeration Documentation

◆ Mode

enum clang::ento::CallDescription::Mode

strong

Enumerator
CLibrary	Match calls to functions from the C standard library. This also recognizes builtin variants whose name is derived by adding "__builtin", "__inline" or similar prefixes or suffixes; but only matches functions than are externally visible and are declared either directly within a TU or in the namespace 'std'. For the exact heuristics, see CheckerContext::isCLibraryFunction().
CLibraryMaybeHardened	An extended version of the `CLibrary` mode that also matches the hardened variants like __FOO_chk() and __builtin__FOO_chk() that take additional arguments compared to the "regular" function FOO(). This is not the default behavior of `CLibrary` because in this case the checker code must be prepared to handle the different parametrization. For the exact heuristics, see CheckerContext::isHardenedVariantOf().
SimpleFunc	Matches "simple" functions that are not methods. (Static methods are methods.)
CXXMethod	Matches a C++ method (may be static, may be virtual, may be an overloaded operator, a constructor or a destructor).
Unspecified	Match any CallEvent that is not an ObjCMethodCall. This should not be used when the checker looks for a concrete function (and knows whether it is a method); but GenericTaintChecker uses this mode to match functions whose name was configured by the user.

Definition at line 34 of file CallDescription.h.

Constructor & Destructor Documentation

◆ CallDescription()

ento::CallDescription::CallDescription	(	Mode	MatchAs,
		ArrayRef< StringRef >	QualifiedName,
		MaybeCount	RequiredArgs = `std::nullopt`,
		MaybeCount	RequiredParams = `std::nullopt`
	)

Constructs a CallDescription object.

Parameters

MatchAs	Specifies the kind of the call that should be matched.
QualifiedName	The list of the name qualifiers of the function that will be matched. The user is allowed to skip any of the qualifiers. For example, {"std", "basic_string", "c_str"} would match both std::basic_string<...>::c_str() and std::__1::basic_string<...>::c_str().
RequiredArgs	The expected number of arguments that are passed to the function. Omit this parameter (or pass std::nullopt) to match every occurrence without checking the argument count in the call.
RequiredParams	The expected number of parameters in the function definition that is called. Omit this parameter to match every occurrence without checking the parameter count in the definition.

Definition at line 38 of file CallDescription.cpp.

Member Function Documentation

◆ begin_qualified_name_parts()

auto clang::ento::CallDescription::begin_qualified_name_parts ( ) const

inline

Get the qualified name parts in reversed order.

E.g. { "std", "vector", "data" } -> "vector", "std"

Definition at line 109 of file CallDescription.h.

◆ end_qualified_name_parts()

auto clang::ento::CallDescription::end_qualified_name_parts ( ) const

inline

Definition at line 112 of file CallDescription.h.

◆ getFunctionName()

StringRef clang::ento::CallDescription::getFunctionName ( ) const

inline

Get the name of the function that this object matches.

Definition at line 105 of file CallDescription.h.

◆ hasQualifiedNameParts()

bool clang::ento::CallDescription::hasQualifiedNameParts ( ) const

inline

It's false, if and only if we expect a single identifier, such as getenv.

It's true for std::swap, or my::detail::container::data.

Definition at line 116 of file CallDescription.h.

◆ matches()

bool ento::CallDescription::matches ( const CallEvent & Call ) const

Returns true if the CallEvent is a call to a function that matches the CallDescription.

Note: This function is not intended to be used to match Obj-C method calls.

Definition at line 51 of file CallDescription.cpp.

References clang::ento::CE_ObjCMessage.

◆ matchesAsWritten()

bool ento::CallDescription::matchesAsWritten ( const CallExpr & CE ) const

Returns true if the CallExpr is a call to a function that matches the CallDescription.

When available, always prefer matching with a CallEvent! This function exists only when that is not available, for example, when only syntactic check is done on a piece of code.

Also, StdLibraryFunctionsChecker::Signature is likely a better candicade for syntactic only matching if you are writing a new checker. This is handy if a CallDescriptionMap is already there.

The function is imprecise because CallEvent may know path sensitive information, such as the precise argument count (see comments for CallEvent::getNumArgs), the called function if it was called through a function pointer, and other information not available syntactically.

Definition at line 63 of file CallDescription.cpp.

References clang::CallExpr::getCalleeDecl(), and clang::CallExpr::getNumArgs().

Friends And Related Function Documentation

◆ CallEvent

friend class CallEvent

friend

Definition at line 72 of file CallDescription.h.

◆ matchesAny [1/2]

bool matchesAny	(	const CallEvent &	Call,
		const CallDescription &	CD1
	)

friend

Returns true whether the CallEvent matches on any of the CallDescriptions supplied.

Note: This function is not intended to be used to match Obj-C method calls.

Definition at line 133 of file CallDescription.h.

◆ matchesAny [2/2]

template<typename... Ts>

bool matchesAny	(	const CallEvent &	Call,
		const CallDescription &	CD1,
		const Ts &...	CDs
	)

friend

Returns true whether the CallEvent matches on any of the CallDescriptions supplied.

Note: This function is not intended to be used to match Obj-C method calls.

Definition at line 139 of file CallDescription.h.

◆ matchesAnyAsWritten [1/2]

bool matchesAnyAsWritten	(	const CallExpr &	CE,
		const CallDescription &	CD1
	)

friend

Returns true whether the CallExpr matches on any of the CallDescriptions supplied.

Note: This function is not intended to be used to match Obj-C method calls.

Definition at line 170 of file CallDescription.h.

◆ matchesAnyAsWritten [2/2]

template<typename... Ts>

bool matchesAnyAsWritten	(	const CallExpr &	CE,
		const CallDescription &	CD1,
		const Ts &...	CDs
	)

friend

Returns true whether the CallExpr matches on any of the CallDescriptions supplied.

Note: This function is not intended to be used to match Obj-C method calls.

Definition at line 177 of file CallDescription.h.

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

include/clang/StaticAnalyzer/Core/PathSensitive/CallDescription.h
lib/StaticAnalyzer/Core/CallDescription.cpp

Public Types

Public Member Functions

Friends

Matching CallDescriptions against a CallEvent

Matching CallDescriptions against a CallExpr

Detailed Description

Member Enumeration Documentation

◆ Mode

Constructor & Destructor Documentation

◆ CallDescription()

Member Function Documentation

◆ begin_qualified_name_parts()

◆ end_qualified_name_parts()

◆ getFunctionName()

◆ hasQualifiedNameParts()

◆ matches()

◆ matchesAsWritten()

Friends And Related Function Documentation

◆ CallEvent

◆ matchesAny [1/2]

◆ matchesAny [2/2]

◆ matchesAnyAsWritten [1/2]

◆ matchesAnyAsWritten [2/2]