forked from OSchip/llvm-project
82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
//===--- InaccurateEraseCheck.cpp - clang-tidy-----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "InaccurateEraseCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/Lex/Lexer.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace bugprone {
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namespace {
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AST_MATCHER(Decl, isInStdNamespace) { return Node.isInStdNamespace(); }
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}
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void InaccurateEraseCheck::registerMatchers(MatchFinder *Finder) {
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// Only register the matchers for C++; the functionality currently does not
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// provide any benefit to other languages, despite being benign.
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if (!getLangOpts().CPlusPlus)
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return;
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const auto EndCall =
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callExpr(
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callee(functionDecl(hasAnyName("remove", "remove_if", "unique"))),
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hasArgument(
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1,
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anyOf(cxxConstructExpr(has(ignoringImplicit(
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cxxMemberCallExpr(callee(cxxMethodDecl(hasName("end"))))
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.bind("end")))),
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anything())))
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.bind("alg");
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const auto DeclInStd = type(hasUnqualifiedDesugaredType(
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tagType(hasDeclaration(decl(isInStdNamespace())))));
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Finder->addMatcher(
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cxxMemberCallExpr(
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on(anyOf(hasType(DeclInStd), hasType(pointsTo(DeclInStd)))),
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callee(cxxMethodDecl(hasName("erase"))), argumentCountIs(1),
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hasArgument(0, has(ignoringImplicit(
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anyOf(EndCall, has(ignoringImplicit(EndCall)))))),
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unless(isInTemplateInstantiation()))
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.bind("erase"),
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this);
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}
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void InaccurateEraseCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *MemberCall =
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Result.Nodes.getNodeAs<CXXMemberCallExpr>("erase");
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const auto *EndExpr =
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Result.Nodes.getNodeAs<CXXMemberCallExpr>("end");
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const SourceLocation Loc = MemberCall->getLocStart();
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FixItHint Hint;
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if (!Loc.isMacroID() && EndExpr) {
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const auto *AlgCall = Result.Nodes.getNodeAs<CallExpr>("alg");
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std::string ReplacementText = Lexer::getSourceText(
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CharSourceRange::getTokenRange(EndExpr->getSourceRange()),
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*Result.SourceManager, getLangOpts());
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const SourceLocation EndLoc = Lexer::getLocForEndOfToken(
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AlgCall->getLocEnd(), 0, *Result.SourceManager, getLangOpts());
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Hint = FixItHint::CreateInsertion(EndLoc, ", " + ReplacementText);
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}
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diag(Loc, "this call will remove at most one item even when multiple items "
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"should be removed")
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<< Hint;
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}
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} // namespace bugprone
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} // namespace tidy
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} // namespace clang
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