| 1 | //===--- ShrinkToFitCheck.cpp - clang-tidy---------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "ShrinkToFitCheck.h" |
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| 10 | #include "clang/AST/ASTContext.h" |
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| 11 | #include "clang/ASTMatchers/ASTMatchFinder.h" |
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| 12 | #include "clang/Lex/Lexer.h" |
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| 13 | #include "llvm/ADT/StringRef.h" |
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| 14 | |
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| 15 | using namespace clang::ast_matchers; |
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| 16 | |
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| 17 | namespace clang::tidy::modernize { |
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| 18 | |
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| 19 | void ShrinkToFitCheck::registerMatchers(MatchFinder *Finder) { |
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| 20 | // Swap as a function need not to be considered, because rvalue can not |
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| 21 | // be bound to a non-const reference. |
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| 22 | const auto ShrinkableExpr = mapAnyOf(memberExpr, declRefExpr); |
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| 23 | const auto Shrinkable = |
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| 24 | ShrinkableExpr.with(hasDeclaration(InnerMatcher: valueDecl().bind(ID: "ContainerDecl" ))); |
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| 25 | const auto BoundShrinkable = ShrinkableExpr.with( |
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| 26 | hasDeclaration(InnerMatcher: valueDecl(equalsBoundNode(ID: "ContainerDecl" )))); |
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| 27 | |
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| 28 | Finder->addMatcher( |
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| 29 | NodeMatch: cxxMemberCallExpr( |
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| 30 | callee(InnerMatcher: cxxMethodDecl(hasName(Name: "swap" ))), |
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| 31 | hasArgument( |
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| 32 | N: 0, InnerMatcher: anyOf(Shrinkable, unaryOperator(hasUnaryOperand(InnerMatcher: Shrinkable)))), |
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| 33 | on(InnerMatcher: cxxConstructExpr(hasArgument( |
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| 34 | N: 0, |
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| 35 | InnerMatcher: expr(anyOf(BoundShrinkable, |
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| 36 | unaryOperator(hasUnaryOperand(InnerMatcher: BoundShrinkable))), |
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| 37 | hasType(InnerMatcher: hasCanonicalType(InnerMatcher: hasDeclaration(InnerMatcher: namedDecl(hasAnyName( |
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| 38 | "std::basic_string" , "std::deque" , "std::vector" )))))) |
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| 39 | .bind(ID: "ContainerToShrink" ))))) |
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| 40 | .bind(ID: "CopyAndSwapTrick" ), |
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| 41 | Action: this); |
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| 42 | } |
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| 43 | |
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| 44 | void ShrinkToFitCheck::check(const MatchFinder::MatchResult &Result) { |
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| 45 | const auto *MemberCall = |
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| 46 | Result.Nodes.getNodeAs<CXXMemberCallExpr>(ID: "CopyAndSwapTrick" ); |
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| 47 | const auto *Container = Result.Nodes.getNodeAs<Expr>(ID: "ContainerToShrink" ); |
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| 48 | FixItHint Hint; |
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| 49 | |
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| 50 | if (!MemberCall->getBeginLoc().isMacroID()) { |
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| 51 | const LangOptions &Opts = getLangOpts(); |
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| 52 | std::string ReplacementText; |
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| 53 | if (const auto *UnaryOp = llvm::dyn_cast<UnaryOperator>(Val: Container)) { |
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| 54 | ReplacementText = std::string( |
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| 55 | Lexer::getSourceText(Range: CharSourceRange::getTokenRange( |
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| 56 | UnaryOp->getSubExpr()->getSourceRange()), |
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| 57 | SM: *Result.SourceManager, LangOpts: Opts)); |
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| 58 | ReplacementText += "->shrink_to_fit()" ; |
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| 59 | } else { |
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| 60 | ReplacementText = std::string(Lexer::getSourceText( |
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| 61 | Range: CharSourceRange::getTokenRange(Container->getSourceRange()), |
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| 62 | SM: *Result.SourceManager, LangOpts: Opts)); |
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| 63 | ReplacementText += ".shrink_to_fit()" ; |
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| 64 | } |
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| 65 | |
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| 66 | Hint = FixItHint::CreateReplacement(MemberCall->getSourceRange(), |
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| 67 | ReplacementText); |
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| 68 | } |
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| 69 | |
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| 70 | diag(MemberCall->getBeginLoc(), "the shrink_to_fit method should be used " |
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| 71 | "to reduce the capacity of a shrinkable " |
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| 72 | "container" ) |
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| 73 | << Hint; |
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| 74 | } |
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| 75 | |
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| 76 | } // namespace clang::tidy::modernize |
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| 77 | |
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