clang::tidy::llvm_check::PreferIsaOrDynCastInConditionalsCheck Class Reference

Looks at conditionals and finds and replaces cases of cast<>, which will assert rather than return a null pointer, and dyn_cast<> where the return value is not captured. More...

#include <PreferIsaOrDynCastInConditionalsCheck.h>

Inheritance diagram for clang::tidy::llvm_check::PreferIsaOrDynCastInConditionalsCheck:

Public Member Functions
	PreferIsaOrDynCastInConditionalsCheck (StringRef Name, ClangTidyContext *Context)
bool	isLanguageVersionSupported (const LangOptions &LangOpts) const override
	Override this to disable registering matchers and PP callbacks if an invalid language version is being used.
void	registerMatchers (ast_matchers::MatchFinder *Finder) override
	Override this to register AST matchers with Finder.
void	check (const ast_matchers::MatchFinder::MatchResult &Result) override
	ClangTidyChecks that register ASTMatchers should do the actual work in here.
Public Member Functions inherited from clang::tidy::ClangTidyCheck
	ClangTidyCheck (StringRef CheckName, ClangTidyContext *Context)
	Initializes the check with CheckName and Context.
virtual bool	isLanguageVersionSupported (const LangOptions &LangOpts) const
	Override this to disable registering matchers and PP callbacks if an invalid language version is being used.
virtual void	registerPPCallbacks (const SourceManager &SM, Preprocessor *PP, Preprocessor *ModuleExpanderPP)
	Override this to register PPCallbacks in the preprocessor.
virtual void	registerMatchers (ast_matchers::MatchFinder *Finder)
	Override this to register AST matchers with Finder.
virtual void	check (const ast_matchers::MatchFinder::MatchResult &Result)
	ClangTidyChecks that register ASTMatchers should do the actual work in here.
DiagnosticBuilder	diag (SourceLocation Loc, StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
	Add a diagnostic with the check's name.
DiagnosticBuilder	diag (StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
	Add a diagnostic with the check's name.
DiagnosticBuilder	configurationDiag (StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning) const
	Adds a diagnostic to report errors in the check's configuration.
virtual void	storeOptions (ClangTidyOptions::OptionMap &Options)
	Should store all options supported by this check with their current values or default values for options that haven't been overridden.

Additional Inherited Members
Protected Member Functions inherited from clang::tidy::ClangTidyCheck
StringRef	getCurrentMainFile () const
	Returns the main file name of the current translation unit.
const LangOptions &	getLangOpts () const
	Returns the language options from the context.
bool	areDiagsSelfContained () const
	Returns true when the check is run in a use case when only 1 fix will be applied at a time.
StringRef	getID () const override
Protected Attributes inherited from clang::tidy::ClangTidyCheck
OptionsView	Options

Detailed Description

Looks at conditionals and finds and replaces cases of cast<>, which will assert rather than return a null pointer, and dyn_cast<> where the return value is not captured.

Additionally, finds and replaces cases that match the pattern var && isa<X>(var), where var is evaluated twice.

Finds cases like these:

if (auto x = cast<X>(y)) {}
// is replaced by:
if (auto x = dyn_cast<X>(y)) {}
 
if (cast<X>(y)) {}
// is replaced by:
if (isa<X>(y)) {}
 
if (dyn_cast<X>(y)) {}
// is replaced by:
if (isa<X>(y)) {}
 
if (var && isa<T>(var)) {}
// is replaced by:
if (isa_and_nonnull<T>(var.foo())) {}

// Other cases are ignored, e.g.:

if (auto f = cast<Z>(y)->foo()) {}
if (cast<Z>(y)->foo()) {}
if (X.cast(y)) {}

For the user-facing documentation see: http://clang.llvm.org/extra/clang-tidy/checks/llvm/prefer-isa-or-dyn-cast-in-conditionals.html

Definition at line 49 of file PreferIsaOrDynCastInConditionalsCheck.h.

Constructor & Destructor Documentation

PreferIsaOrDynCastInConditionalsCheck()

clang::tidy::llvm_check::PreferIsaOrDynCastInConditionalsCheck::PreferIsaOrDynCastInConditionalsCheck ( StringRef  Name, ClangTidyContext *  Context  )

inline

Definition at line 51 of file PreferIsaOrDynCastInConditionalsCheck.h.

Member Function Documentation

check()

void clang::tidy::llvm_check::PreferIsaOrDynCastInConditionalsCheck::check ( const ast_matchers::MatchFinder::MatchResult &  Result )

overridevirtual

ClangTidyChecks that register ASTMatchers should do the actual work in here.

Reimplemented from clang::tidy::ClangTidyCheck.

Definition at line 65 of file PreferIsaOrDynCastInConditionalsCheck.cpp.

References clang::tidy::ClangTidyCheck::diag(), and clang::tidy::ClangTidyCheck::getLangOpts().

isLanguageVersionSupported()

bool clang::tidy::llvm_check::PreferIsaOrDynCastInConditionalsCheck::isLanguageVersionSupported ( const LangOptions &  LangOpts ) const

inlineoverridevirtual

Override this to disable registering matchers and PP callbacks if an invalid language version is being used.

For example if a check is examining overloaded functions then this should be overridden to return false when the CPlusPlus flag is not set in LangOpts.

Reimplemented from clang::tidy::ClangTidyCheck.

Definition at line 54 of file PreferIsaOrDynCastInConditionalsCheck.h.

registerMatchers()

void clang::tidy::llvm_check::PreferIsaOrDynCastInConditionalsCheck::registerMatchers ( ast_matchers::MatchFinder *  Finder )

overridevirtual

Override this to register AST matchers with Finder.

This should be used by clang-tidy checks that analyze code properties that dependent on AST knowledge.

You can register as many matchers as necessary with Finder. Usually, "this" will be used as callback, but you can also specify other callback classes. Thereby, different matchers can trigger different callbacks.

This will only be executed if the function isLanguageVersionSupported returns true.

If you need to merge information between the different matchers, you can store these as members of the derived class. However, note that all matches occur in the order of the AST traversal.

Reimplemented from clang::tidy::ClangTidyCheck.

Definition at line 24 of file PreferIsaOrDynCastInConditionalsCheck.cpp.

References Condition.

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

• PreferIsaOrDynCastInConditionalsCheck.h
• PreferIsaOrDynCastInConditionalsCheck.cpp