clang-tools  8.0.0
DurationFactoryFloatCheck.cpp
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1 //===--- DurationFactoryFloatCheck.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 
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 // Returns `true` if `Range` is inside a macro definition.
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 
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 
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
static bool InsideMacroDefinition(const MatchFinder::MatchResult &Result, SourceRange Range)
llvm::Optional< llvm::Expected< tooling::AtomicChanges > > Result
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
CharSourceRange Range
SourceRange for the file name.
llvm::Optional< std::string > stripFloatCast(const ast_matchers::MatchFinder::MatchResult &Result, const Expr &Node)
Possibly strip a floating point cast expression.
llvm::Optional< std::string > stripFloatLiteralFraction(const MatchFinder::MatchResult &Result, const Expr &Node)