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//===--- DurationConversionCastCheck.cpp - clang-tidy ---------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "DurationConversionCastCheck.h"
#include "DurationRewriter.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Tooling/FixIt.h"
#include <optional>
using namespace clang::ast_matchers;
namespace clang::tidy::abseil {
void DurationConversionCastCheck::registerMatchers(MatchFinder *Finder) {
auto CallMatcher = ignoringImpCasts(callExpr(
callee(functionDecl(DurationConversionFunction()).bind("func_decl")),
hasArgument(0, expr().bind("arg"))));
Finder->addMatcher(
expr(anyOf(
cxxStaticCastExpr(hasSourceExpression(CallMatcher)).bind("cast_expr"),
cStyleCastExpr(hasSourceExpression(CallMatcher)).bind("cast_expr"),
cxxFunctionalCastExpr(hasSourceExpression(CallMatcher))
.bind("cast_expr"))),
this);
}
void DurationConversionCastCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *MatchedCast =
Result.Nodes.getNodeAs<ExplicitCastExpr>("cast_expr");
if (isInMacro(Result, MatchedCast))
return;
const auto *FuncDecl = Result.Nodes.getNodeAs<FunctionDecl>("func_decl");
const auto *Arg = Result.Nodes.getNodeAs<Expr>("arg");
StringRef ConversionFuncName = FuncDecl->getName();
std::optional<DurationScale> Scale =
getScaleForDurationInverse(ConversionFuncName);
if (!Scale)
return;
// Casting a double to an integer.
if (MatchedCast->getTypeAsWritten()->isIntegerType() &&
ConversionFuncName.contains("Double")) {
llvm::StringRef NewFuncName = getDurationInverseForScale(*Scale).second;
diag(MatchedCast->getBeginLoc(),
"duration should be converted directly to an integer rather than "
"through a type cast")
<< FixItHint::CreateReplacement(
MatchedCast->getSourceRange(),
(llvm::Twine(NewFuncName.substr(2)) + "(" +
tooling::fixit::getText(*Arg, *Result.Context) + ")")
.str());
}
// Casting an integer to a double.
if (MatchedCast->getTypeAsWritten()->isRealFloatingType() &&
ConversionFuncName.contains("Int64")) {
llvm::StringRef NewFuncName = getDurationInverseForScale(*Scale).first;
diag(MatchedCast->getBeginLoc(), "duration should be converted directly to "
"a floating-point number rather than "
"through a type cast")
<< FixItHint::CreateReplacement(
MatchedCast->getSourceRange(),
(llvm::Twine(NewFuncName.substr(2)) + "(" +
tooling::fixit::getText(*Arg, *Result.Context) + ")")
.str());
}
}
} // namespace clang::tidy::abseil
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