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
9 #include "DurationFactoryFloatCheck.h"
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
16 using namespace clang::ast_matchers;
17
18 namespace clang {
19 namespace tidy {
20 namespace abseil {
21
22 // Returns `true` if `Range` is inside a macro definition.
InsideMacroDefinition(const MatchFinder::MatchResult & Result,SourceRange Range)23 static bool InsideMacroDefinition(const MatchFinder::MatchResult &Result,
24 SourceRange Range) {
25 return !clang::Lexer::makeFileCharRange(
26 clang::CharSourceRange::getCharRange(Range),
27 *Result.SourceManager, Result.Context->getLangOpts())
28 .isValid();
29 }
30
registerMatchers(MatchFinder * Finder)31 void DurationFactoryFloatCheck::registerMatchers(MatchFinder *Finder) {
32 Finder->addMatcher(
33 callExpr(callee(functionDecl(DurationFactoryFunction())),
34 hasArgument(0, anyOf(cxxStaticCastExpr(hasDestinationType(
35 realFloatingPointType())),
36 cStyleCastExpr(hasDestinationType(
37 realFloatingPointType())),
38 cxxFunctionalCastExpr(hasDestinationType(
39 realFloatingPointType())),
40 floatLiteral())))
41 .bind("call"),
42 this);
43 }
44
check(const MatchFinder::MatchResult & Result)45 void DurationFactoryFloatCheck::check(const MatchFinder::MatchResult &Result) {
46 const auto *MatchedCall = Result.Nodes.getNodeAs<CallExpr>("call");
47
48 // Don't try and replace things inside of macro definitions.
49 if (InsideMacroDefinition(Result, MatchedCall->getSourceRange()))
50 return;
51
52 const Expr *Arg = MatchedCall->getArg(0)->IgnoreImpCasts();
53 // Arguments which are macros are ignored.
54 if (Arg->getBeginLoc().isMacroID())
55 return;
56
57 llvm::Optional<std::string> SimpleArg = stripFloatCast(Result, *Arg);
58 if (!SimpleArg)
59 SimpleArg = stripFloatLiteralFraction(Result, *Arg);
60
61 if (SimpleArg) {
62 diag(MatchedCall->getBeginLoc(),
63 (llvm::Twine("use the integer version of absl::") +
64 MatchedCall->getDirectCallee()->getName())
65 .str())
66 << FixItHint::CreateReplacement(Arg->getSourceRange(), *SimpleArg);
67 }
68 }
69
70 } // namespace abseil
71 } // namespace tidy
72 } // namespace clang
73