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1 //===--- DurationSubtractionCheck.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 "DurationSubtractionCheck.h"
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10 #include "DurationRewriter.h"
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11 #include "clang/AST/ASTContext.h"
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12 #include "clang/ASTMatchers/ASTMatchFinder.h"
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13 #include "clang/Tooling/FixIt.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 {
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18 namespace tidy {
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19 namespace abseil {
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20
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21 void DurationSubtractionCheck::registerMatchers(MatchFinder *Finder) {
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22 Finder->addMatcher(
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23 binaryOperator(
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24 hasOperatorName("-"),
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25 hasLHS(callExpr(callee(functionDecl(DurationConversionFunction())
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26 .bind("function_decl")),
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27 hasArgument(0, expr().bind("lhs_arg")))))
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28 .bind("binop"),
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29 this);
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30 }
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31
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32 void DurationSubtractionCheck::check(const MatchFinder::MatchResult &Result) {
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33 const auto *Binop = Result.Nodes.getNodeAs<BinaryOperator>("binop");
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34 const auto *FuncDecl = Result.Nodes.getNodeAs<FunctionDecl>("function_decl");
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35
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36 // Don't try to replace things inside of macro definitions.
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37 if (Binop->getExprLoc().isMacroID() || Binop->getExprLoc().isInvalid())
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38 return;
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39
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40 llvm::Optional<DurationScale> Scale =
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41 getScaleForDurationInverse(FuncDecl->getName());
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42 if (!Scale)
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43 return;
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44
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45 std::string RhsReplacement =
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46 rewriteExprFromNumberToDuration(Result, *Scale, Binop->getRHS());
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47
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48 const Expr *LhsArg = Result.Nodes.getNodeAs<Expr>("lhs_arg");
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49
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50 diag(Binop->getBeginLoc(), "perform subtraction in the duration domain")
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51 << FixItHint::CreateReplacement(
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52 Binop->getSourceRange(),
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53 (llvm::Twine("absl::") + FuncDecl->getName() + "(" +
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54 tooling::fixit::getText(*LhsArg, *Result.Context) + " - " +
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55 RhsReplacement + ")")
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56 .str());
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57 }
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58
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59 } // namespace abseil
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60 } // namespace tidy
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61 } // namespace clang
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