InaccurateEraseCheck.cpp
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//===--- InaccurateEraseCheck.cpp - clang-tidy-----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "InaccurateEraseCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Lex/Lexer.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace bugprone {
void InaccurateEraseCheck::registerMatchers(MatchFinder *Finder) {
// Only register the matchers for C++; the functionality currently does not
// provide any benefit to other languages, despite being benign.
if (!getLangOpts().CPlusPlus)
return;
const auto EndCall =
callExpr(
callee(functionDecl(hasAnyName("remove", "remove_if", "unique"))),
hasArgument(
1,
anyOf(cxxConstructExpr(has(ignoringImplicit(
cxxMemberCallExpr(callee(cxxMethodDecl(hasName("end"))))
.bind("end")))),
anything())))
.bind("alg");
const auto DeclInStd = type(hasUnqualifiedDesugaredType(
tagType(hasDeclaration(decl(isInStdNamespace())))));
Finder->addMatcher(
cxxMemberCallExpr(
on(anyOf(hasType(DeclInStd), hasType(pointsTo(DeclInStd)))),
callee(cxxMethodDecl(hasName("erase"))), argumentCountIs(1),
hasArgument(0, has(ignoringImplicit(
anyOf(EndCall, has(ignoringImplicit(EndCall)))))),
unless(isInTemplateInstantiation()))
.bind("erase"),
this);
}
void InaccurateEraseCheck::check(const MatchFinder::MatchResult &Result) {
const auto *MemberCall =
Result.Nodes.getNodeAs<CXXMemberCallExpr>("erase");
const auto *EndExpr =
Result.Nodes.getNodeAs<CXXMemberCallExpr>("end");
const SourceLocation Loc = MemberCall->getBeginLoc();
FixItHint Hint;
if (!Loc.isMacroID() && EndExpr) {
const auto *AlgCall = Result.Nodes.getNodeAs<CallExpr>("alg");
std::string ReplacementText = Lexer::getSourceText(
CharSourceRange::getTokenRange(EndExpr->getSourceRange()),
*Result.SourceManager, getLangOpts());
const SourceLocation EndLoc = Lexer::getLocForEndOfToken(
AlgCall->getEndLoc(), 0, *Result.SourceManager, getLangOpts());
Hint = FixItHint::CreateInsertion(EndLoc, ", " + ReplacementText);
}
diag(Loc, "this call will remove at most one item even when multiple items "
"should be removed")
<< Hint;
}
} // namespace bugprone
} // namespace tidy
} // namespace clang