clang-tools 20.0.0git
DurationSubtractionCheck.cpp
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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
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
16using namespace clang::ast_matchers;
17
18namespace clang::tidy::abseil {
19
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
31void 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 =
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
DiagnosticBuilder diag(SourceLocation Loc, StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
Add a diagnostic with the check's name.
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
std::optional< DurationScale > getScaleForDurationInverse(llvm::StringRef Name)
Given the name of an inverse Duration function (e.g., ToDoubleSeconds), return its DurationScale,...
std::string rewriteExprFromNumberToDuration(const ast_matchers::MatchFinder::MatchResult &Result, DurationScale Scale, const Expr *Node)
Assuming Node has type double or int representing a time interval of Scale, return the expression to ...
static constexpr const char FuncDecl[]