clang-tools 10.0.0

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
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
15 using namespace clang::ast_matchers;
16
17 namespace clang {
18 namespace tidy {
19 namespace abseil {
20
21 void DurationSubtractionCheck::registerMatchers(MatchFinder *Finder) {
22 Finder->addMatcher(
23 binaryOperator(
24 hasOperatorName("-"),
25 hasLHS(callExpr(callee(functionDecl(DurationConversionFunction())
26 .bind("function_decl")),
27 hasArgument(0, expr().bind("lhs_arg")))))
28 .bind("binop"),
29 this);
30 }
31
32 void DurationSubtractionCheck::check(const MatchFinder::MatchResult &Result) {
33 const auto *Binop = Result.Nodes.getNodeAs<BinaryOperator>("binop");
34 const auto *FuncDecl = Result.Nodes.getNodeAs<FunctionDecl>("function_decl");
35
36 // Don't try to replace things inside of macro definitions.
37 if (Binop->getExprLoc().isMacroID() || Binop->getExprLoc().isInvalid())
38 return;
39
40 llvm::Optional<DurationScale> Scale =
41 getScaleForDurationInverse(FuncDecl->getName());
42 if (!Scale)
43 return;
44
45 std::string RhsReplacement =
46 rewriteExprFromNumberToDuration(Result, *Scale, Binop->getRHS());
47
48 const Expr *LhsArg = Result.Nodes.getNodeAs<Expr>("lhs_arg");
49
50 diag(Binop->getBeginLoc(), "perform subtraction in the duration domain")
51 << FixItHint::CreateReplacement(
52 Binop->getSourceRange(),
53 (llvm::Twine("absl::") + FuncDecl->getName() + "(" +
54 tooling::fixit::getText(*LhsArg, *Result.Context) + " - " +
55 RhsReplacement + ")")
56 .str());
57 }
58
59 } // namespace abseil
60 } // namespace tidy
61 } // namespace clang
DurationRewriter.h
clang::ast_matchers
Definition: AbseilMatcher.h:14
clang::tidy::abseil::getScaleForDurationInverse
llvm::Optional< DurationScale > getScaleForDurationInverse(llvm::StringRef Name)
Given the name of an inverse Duration function (e.g., ToDoubleSeconds), return its DurationScale...
Definition: DurationRewriter.cpp:231
clang::tidy::abseil::rewriteExprFromNumberToDuration
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 ...
Definition: DurationRewriter.cpp:269
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27
DurationSubtractionCheck.h