81 lines
3.1 KiB
C++
81 lines
3.1 KiB
C++
//===--- ShrinkToFitCheck.cpp - clang-tidy---------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "ShrinkToFitCheck.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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#include "llvm/ADT/StringRef.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 modernize {
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void ShrinkToFitCheck::registerMatchers(MatchFinder *Finder) {
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// Swap as a function need not to be considered, because rvalue can not
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// be bound to a non-const reference.
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const auto ShrinkableExpr = mapAnyOf(memberExpr, declRefExpr);
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const auto Shrinkable =
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ShrinkableExpr.with(hasDeclaration(valueDecl().bind("ContainerDecl")));
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const auto BoundShrinkable = ShrinkableExpr.with(
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hasDeclaration(valueDecl(equalsBoundNode("ContainerDecl"))));
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Finder->addMatcher(
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cxxMemberCallExpr(
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callee(cxxMethodDecl(hasName("swap"))),
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hasArgument(
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0, anyOf(Shrinkable, unaryOperator(hasUnaryOperand(Shrinkable)))),
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on(cxxConstructExpr(hasArgument(
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0,
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expr(anyOf(BoundShrinkable,
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unaryOperator(hasUnaryOperand(BoundShrinkable))),
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hasType(hasCanonicalType(hasDeclaration(namedDecl(hasAnyName(
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"std::basic_string", "std::deque", "std::vector"))))))
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.bind("ContainerToShrink")))))
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.bind("CopyAndSwapTrick"),
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this);
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}
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void ShrinkToFitCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *MemberCall =
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Result.Nodes.getNodeAs<CXXMemberCallExpr>("CopyAndSwapTrick");
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const auto *Container = Result.Nodes.getNodeAs<Expr>("ContainerToShrink");
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FixItHint Hint;
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if (!MemberCall->getBeginLoc().isMacroID()) {
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const LangOptions &Opts = getLangOpts();
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std::string ReplacementText;
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if (const auto *UnaryOp = llvm::dyn_cast<UnaryOperator>(Container)) {
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ReplacementText = std::string(
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Lexer::getSourceText(CharSourceRange::getTokenRange(
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UnaryOp->getSubExpr()->getSourceRange()),
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*Result.SourceManager, Opts));
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ReplacementText += "->shrink_to_fit()";
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} else {
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ReplacementText = std::string(Lexer::getSourceText(
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CharSourceRange::getTokenRange(Container->getSourceRange()),
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*Result.SourceManager, Opts));
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ReplacementText += ".shrink_to_fit()";
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}
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Hint = FixItHint::CreateReplacement(MemberCall->getSourceRange(),
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ReplacementText);
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}
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diag(MemberCall->getBeginLoc(), "the shrink_to_fit method should be used "
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"to reduce the capacity of a shrinkable "
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"container")
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<< Hint;
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}
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} // namespace modernize
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} // namespace tidy
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} // namespace clang
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