clang-tools 8.0.0

DurationSubtractionCheck.cpp
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1 //===--- DurationSubtractionCheck.cpp - clang-tidy ------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "DurationSubtractionCheck.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 DurationSubtractionCheck::registerMatchers(MatchFinder *Finder) {
23 Finder->addMatcher(
24 binaryOperator(
25 hasOperatorName("-"),
26 hasLHS(callExpr(callee(functionDecl(DurationConversionFunction())
27 .bind("function_decl")),
28 hasArgument(0, expr().bind("lhs_arg")))))
29 .bind("binop"),
30 this);
31 }
32
33 void DurationSubtractionCheck::check(const MatchFinder::MatchResult &Result) {
34 const auto *Binop = Result.Nodes.getNodeAs<BinaryOperator>("binop");
35 const auto *FuncDecl = Result.Nodes.getNodeAs<FunctionDecl>("function_decl");
36
37 // Don't try to replace things inside of macro definitions.
38 if (Binop->getExprLoc().isMacroID() || Binop->getExprLoc().isInvalid())
39 return;
40
41 llvm::Optional<DurationScale> Scale = getScaleForInverse(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:15
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:201
Result
llvm::Optional< llvm::Expected< tooling::AtomicChanges > > Result
Definition: ClangdServer.cpp:60
clang::tidy::abseil::getScaleForInverse
llvm::Optional< DurationScale > getScaleForInverse(llvm::StringRef Name)
Given the name of an inverse Duration function (e.g., ToDoubleSeconds), return its DurationScale...
Definition: DurationRewriter.cpp:179
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ChangeNamespace.cpp:18
DurationSubtractionCheck.h