1 //===--- DurationSubtractionCheck.cpp - clang-tidy ------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "DurationSubtractionCheck.h"
10 #include "DurationRewriter.h"
11 #include "clang/AST/ASTContext.h"
12 #include "clang/ASTMatchers/ASTMatchFinder.h"
13 #include "clang/Tooling/FixIt.h"
14 #include <optional>
15
16 using namespace clang::ast_matchers;
17
18 namespace clang::tidy::abseil {
19
registerMatchers(MatchFinder * Finder)20 void DurationSubtractionCheck::registerMatchers(MatchFinder *Finder) {
21 Finder->addMatcher(
22 binaryOperator(
23 hasOperatorName("-"),
24 hasLHS(callExpr(callee(functionDecl(DurationConversionFunction())
25 .bind("function_decl")),
26 hasArgument(0, expr().bind("lhs_arg")))))
27 .bind("binop"),
28 this);
29 }
30
check(const MatchFinder::MatchResult & Result)31 void DurationSubtractionCheck::check(const MatchFinder::MatchResult &Result) {
32 const auto *Binop = Result.Nodes.getNodeAs<BinaryOperator>("binop");
33 const auto *FuncDecl = Result.Nodes.getNodeAs<FunctionDecl>("function_decl");
34
35 // Don't try to replace things inside of macro definitions.
36 if (Binop->getExprLoc().isMacroID() || Binop->getExprLoc().isInvalid())
37 return;
38
39 std::optional<DurationScale> Scale =
40 getScaleForDurationInverse(FuncDecl->getName());
41 if (!Scale)
42 return;
43
44 std::string RhsReplacement =
45 rewriteExprFromNumberToDuration(Result, *Scale, Binop->getRHS());
46
47 const Expr *LhsArg = Result.Nodes.getNodeAs<Expr>("lhs_arg");
48
49 diag(Binop->getBeginLoc(), "perform subtraction in the duration domain")
50 << FixItHint::CreateReplacement(
51 Binop->getSourceRange(),
52 (llvm::Twine("absl::") + FuncDecl->getName() + "(" +
53 tooling::fixit::getText(*LhsArg, *Result.Context) + " - " +
54 RhsReplacement + ")")
55 .str());
56 }
57
58 } // namespace clang::tidy::abseil
59