clang-tools 20.0.0git
DurationConversionCastCheck.cpp
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1//===--- DurationConversionCastCheck.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 auto CallMatcher = ignoringImpCasts(callExpr(
22 callee(functionDecl(DurationConversionFunction()).bind("func_decl")),
23 hasArgument(0, expr().bind("arg"))));
24
25 Finder->addMatcher(
26 expr(anyOf(
27 cxxStaticCastExpr(hasSourceExpression(CallMatcher)).bind("cast_expr"),
28 cStyleCastExpr(hasSourceExpression(CallMatcher)).bind("cast_expr"),
29 cxxFunctionalCastExpr(hasSourceExpression(CallMatcher))
30 .bind("cast_expr"))),
31 this);
32}
33
35 const MatchFinder::MatchResult &Result) {
36 const auto *MatchedCast =
37 Result.Nodes.getNodeAs<ExplicitCastExpr>("cast_expr");
38
39 if (isInMacro(Result, MatchedCast))
40 return;
41
42 const auto *FuncDecl = Result.Nodes.getNodeAs<FunctionDecl>("func_decl");
43 const auto *Arg = Result.Nodes.getNodeAs<Expr>("arg");
44 StringRef ConversionFuncName = FuncDecl->getName();
45
46 std::optional<DurationScale> Scale =
47 getScaleForDurationInverse(ConversionFuncName);
48 if (!Scale)
49 return;
50
51 // Casting a double to an integer.
52 if (MatchedCast->getTypeAsWritten()->isIntegerType() &&
53 ConversionFuncName.contains("Double")) {
54 llvm::StringRef NewFuncName = getDurationInverseForScale(*Scale).second;
55
56 diag(MatchedCast->getBeginLoc(),
57 "duration should be converted directly to an integer rather than "
58 "through a type cast")
59 << FixItHint::CreateReplacement(
60 MatchedCast->getSourceRange(),
61 (llvm::Twine(NewFuncName.substr(2)) + "(" +
62 tooling::fixit::getText(*Arg, *Result.Context) + ")")
63 .str());
64 }
65
66 // Casting an integer to a double.
67 if (MatchedCast->getTypeAsWritten()->isRealFloatingType() &&
68 ConversionFuncName.contains("Int64")) {
69 llvm::StringRef NewFuncName = getDurationInverseForScale(*Scale).first;
70
71 diag(MatchedCast->getBeginLoc(), "duration should be converted directly to "
72 "a floating-point number rather than "
73 "through a type cast")
74 << FixItHint::CreateReplacement(
75 MatchedCast->getSourceRange(),
76 (llvm::Twine(NewFuncName.substr(2)) + "(" +
77 tooling::fixit::getText(*Arg, *Result.Context) + ")")
78 .str());
79 }
80}
81
82} // namespace clang::tidy::abseil
DiagnosticBuilder diag(SourceLocation Loc, StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
Add a diagnostic with the check's name.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.
const std::pair< llvm::StringRef, llvm::StringRef > & getDurationInverseForScale(DurationScale Scale)
Given a Scale return the fully qualified inverse functions for it.
std::optional< DurationScale > getScaleForDurationInverse(llvm::StringRef Name)
Given the name of an inverse Duration function (e.g., ToDoubleSeconds), return its DurationScale,...
bool isInMacro(const MatchFinder::MatchResult &Result, const Expr *E)
static constexpr const char FuncDecl[]