forked from OSchip/llvm-project
71 lines
2.6 KiB
C++
71 lines
2.6 KiB
C++
//===- RedundantStringInitCheck.cpp - clang-tidy ----------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "RedundantStringInitCheck.h"
|
|
#include "../utils/Matchers.h"
|
|
#include "clang/ASTMatchers/ASTMatchers.h"
|
|
|
|
using namespace clang::ast_matchers;
|
|
using namespace clang::tidy::matchers;
|
|
|
|
namespace clang {
|
|
namespace tidy {
|
|
namespace readability {
|
|
|
|
void RedundantStringInitCheck::registerMatchers(MatchFinder *Finder) {
|
|
if (!getLangOpts().CPlusPlus)
|
|
return;
|
|
|
|
// Match string constructor.
|
|
const auto StringConstructorExpr = expr(anyOf(
|
|
cxxConstructExpr(argumentCountIs(1),
|
|
hasDeclaration(cxxMethodDecl(hasName("basic_string")))),
|
|
// If present, the second argument is the alloc object which must not
|
|
// be present explicitly.
|
|
cxxConstructExpr(argumentCountIs(2),
|
|
hasDeclaration(cxxMethodDecl(hasName("basic_string"))),
|
|
hasArgument(1, cxxDefaultArgExpr()))));
|
|
|
|
// Match a string constructor expression with an empty string literal.
|
|
const auto EmptyStringCtorExpr = cxxConstructExpr(
|
|
StringConstructorExpr,
|
|
hasArgument(0, ignoringParenImpCasts(stringLiteral(hasSize(0)))));
|
|
|
|
const auto EmptyStringCtorExprWithTemporaries =
|
|
cxxConstructExpr(StringConstructorExpr,
|
|
hasArgument(0, ignoringImplicit(EmptyStringCtorExpr)));
|
|
|
|
// Match a variable declaration with an empty string literal as initializer.
|
|
// Examples:
|
|
// string foo = "";
|
|
// string bar("");
|
|
Finder->addMatcher(
|
|
namedDecl(
|
|
varDecl(hasType(cxxRecordDecl(hasName("basic_string"))),
|
|
hasInitializer(expr(ignoringImplicit(anyOf(
|
|
EmptyStringCtorExpr,
|
|
EmptyStringCtorExprWithTemporaries)))
|
|
.bind("expr"))),
|
|
unless(parmVarDecl()))
|
|
.bind("decl"),
|
|
this);
|
|
}
|
|
|
|
void RedundantStringInitCheck::check(const MatchFinder::MatchResult &Result) {
|
|
const auto *CtorExpr = Result.Nodes.getNodeAs<Expr>("expr");
|
|
const auto *Decl = Result.Nodes.getNodeAs<NamedDecl>("decl");
|
|
diag(CtorExpr->getExprLoc(), "redundant string initialization")
|
|
<< FixItHint::CreateReplacement(CtorExpr->getSourceRange(),
|
|
Decl->getName());
|
|
}
|
|
|
|
} // namespace readability
|
|
} // namespace tidy
|
|
} // namespace clang
|