clang-tools 10.0.0

TimeComparisonCheck.cpp
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1 //===--- TimeComparisonCheck.cpp - clang-tidy
2 //--------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "TimeComparisonCheck.h"
11 #include "DurationRewriter.h"
12 #include "clang/AST/ASTContext.h"
13 #include "clang/ASTMatchers/ASTMatchFinder.h"
14 #include "clang/Tooling/FixIt.h"
15
16 using namespace clang::ast_matchers;
17
18 namespace clang {
19 namespace tidy {
20 namespace abseil {
21
22 void TimeComparisonCheck::registerMatchers(MatchFinder *Finder) {
23 auto Matcher =
24 expr(comparisonOperatorWithCallee(functionDecl(
25 functionDecl(TimeConversionFunction()).bind("function_decl"))))
26 .bind("binop");
27
28 Finder->addMatcher(Matcher, this);
29 }
30
31 void TimeComparisonCheck::check(const MatchFinder::MatchResult &Result) {
32 const auto *Binop = Result.Nodes.getNodeAs<BinaryOperator>("binop");
33
34 llvm::Optional<DurationScale> Scale = getScaleForTimeInverse(
35 Result.Nodes.getNodeAs<FunctionDecl>("function_decl")->getName());
36 if (!Scale)
37 return;
38
39 if (isInMacro(Result, Binop->getLHS()) || isInMacro(Result, Binop->getRHS()))
40 return;
41
42 // In most cases, we'll only need to rewrite one of the sides, but we also
43 // want to handle the case of rewriting both sides. This is much simpler if
44 // we unconditionally try and rewrite both, and let the rewriter determine
45 // if nothing needs to be done.
46 std::string LhsReplacement =
47 rewriteExprFromNumberToTime(Result, *Scale, Binop->getLHS());
48 std::string RhsReplacement =
49 rewriteExprFromNumberToTime(Result, *Scale, Binop->getRHS());
50
51 diag(Binop->getBeginLoc(), "perform comparison in the time domain")
52 << FixItHint::CreateReplacement(Binop->getSourceRange(),
53 (llvm::Twine(LhsReplacement) + " " +
54 Binop->getOpcodeStr() + " " +
55 RhsReplacement)
56 .str());
57 }
58
59 } // namespace abseil
60 } // namespace tidy
61 } // namespace clang
DurationRewriter.h
clang::ast_matchers
Definition: AbseilMatcher.h:14
TimeComparisonCheck.h
clang::tidy::abseil::isInMacro
bool isInMacro(const MatchFinder::MatchResult &Result, const Expr *E)
Definition: DurationRewriter.cpp:305
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27
clang::tidy::abseil::getScaleForTimeInverse
llvm::Optional< DurationScale > getScaleForTimeInverse(llvm::StringRef Name)
Given the name of an inverse Time function (e.g., ToUnixSeconds), return its DurationScale, or None if a match is not found.
Definition: DurationRewriter.cpp:253
clang::tidy::abseil::rewriteExprFromNumberToTime
std::string rewriteExprFromNumberToTime(const ast_matchers::MatchFinder::MatchResult &Result, DurationScale Scale, const Expr *Node)
Assuming Node has a type int representing a time instant of Scale since The Epoch, return the expression to make it a suitable Time.
Definition: DurationRewriter.cpp:287