clang-tools 20.0.0git
DurationFactoryFloatCheck.cpp
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1//===--- DurationFactoryFloatCheck.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/Lex/Lexer.h"
14#include "clang/Tooling/FixIt.h"
15#include <optional>
16
17using namespace clang::ast_matchers;
18
19namespace clang::tidy::abseil {
20
21// Returns `true` if `Range` is inside a macro definition.
22static bool insideMacroDefinition(const MatchFinder::MatchResult &Result,
23 SourceRange Range) {
24 return !clang::Lexer::makeFileCharRange(
25 clang::CharSourceRange::getCharRange(Range),
26 *Result.SourceManager, Result.Context->getLangOpts())
27 .isValid();
28}
29
31 Finder->addMatcher(
32 callExpr(callee(functionDecl(DurationFactoryFunction())),
33 hasArgument(0, anyOf(cxxStaticCastExpr(hasDestinationType(
34 realFloatingPointType())),
35 cStyleCastExpr(hasDestinationType(
36 realFloatingPointType())),
37 cxxFunctionalCastExpr(hasDestinationType(
38 realFloatingPointType())),
39 floatLiteral())))
40 .bind("call"),
41 this);
42}
43
44void DurationFactoryFloatCheck::check(const MatchFinder::MatchResult &Result) {
45 const auto *MatchedCall = Result.Nodes.getNodeAs<CallExpr>("call");
46
47 // Don't try and replace things inside of macro definitions.
48 if (insideMacroDefinition(Result, MatchedCall->getSourceRange()))
49 return;
50
51 const Expr *Arg = MatchedCall->getArg(0)->IgnoreImpCasts();
52 // Arguments which are macros are ignored.
53 if (Arg->getBeginLoc().isMacroID())
54 return;
55
56 std::optional<std::string> SimpleArg = stripFloatCast(Result, *Arg);
57 if (!SimpleArg)
58 SimpleArg = stripFloatLiteralFraction(Result, *Arg);
59
60 if (SimpleArg) {
61 diag(MatchedCall->getBeginLoc(), "use the integer version of absl::%0")
62 << MatchedCall->getDirectCallee()->getName()
63 << FixItHint::CreateReplacement(Arg->getSourceRange(), *SimpleArg);
64 }
65}
66
67} // namespace clang::tidy::abseil
CharSourceRange Range
SourceRange for the file name.
DiagnosticBuilder diag(SourceLocation Loc, StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
Add a diagnostic with the check's name.
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
std::optional< std::string > stripFloatCast(const ast_matchers::MatchFinder::MatchResult &Result, const Expr &Node)
Possibly strip a floating point cast expression.
std::optional< std::string > stripFloatLiteralFraction(const MatchFinder::MatchResult &Result, const Expr &Node)
static bool insideMacroDefinition(const MatchFinder::MatchResult &Result, SourceRange Range)