clang-tools  7.0.0
IntegerDivisionCheck.cpp
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1 //===--- IntegerDivisionCheck.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 
10 #include "IntegerDivisionCheck.h"
11 #include "clang/AST/ASTContext.h"
12 #include "clang/ASTMatchers/ASTMatchFinder.h"
13 
14 using namespace clang::ast_matchers;
15 
16 namespace clang {
17 namespace tidy {
18 namespace bugprone {
19 
20 void IntegerDivisionCheck::registerMatchers(MatchFinder *Finder) {
21  const auto IntType = hasType(isInteger());
22 
23  const auto BinaryOperators = binaryOperator(anyOf(
24  hasOperatorName("%"), hasOperatorName("<<"), hasOperatorName(">>"),
25  hasOperatorName("<<"), hasOperatorName("^"), hasOperatorName("|"),
26  hasOperatorName("&"), hasOperatorName("||"), hasOperatorName("&&"),
27  hasOperatorName("<"), hasOperatorName(">"), hasOperatorName("<="),
28  hasOperatorName(">="), hasOperatorName("=="), hasOperatorName("!=")));
29 
30  const auto UnaryOperators =
31  unaryOperator(anyOf(hasOperatorName("~"), hasOperatorName("!")));
32 
33  const auto Exceptions =
34  anyOf(BinaryOperators, conditionalOperator(), binaryConditionalOperator(),
35  callExpr(IntType), explicitCastExpr(IntType), UnaryOperators);
36 
37  Finder->addMatcher(
38  binaryOperator(
39  hasOperatorName("/"), hasLHS(expr(IntType)), hasRHS(expr(IntType)),
40  hasAncestor(
41  castExpr(hasCastKind(CK_IntegralToFloating)).bind("FloatCast")),
42  unless(hasAncestor(
43  expr(Exceptions,
44  hasAncestor(castExpr(equalsBoundNode("FloatCast")))))))
45  .bind("IntDiv"),
46  this);
47 }
48 
49 void IntegerDivisionCheck::check(const MatchFinder::MatchResult &Result) {
50  const auto *IntDiv = Result.Nodes.getNodeAs<BinaryOperator>("IntDiv");
51  diag(IntDiv->getLocStart(), "result of integer division used in a floating "
52  "point context; possible loss of precision");
53 }
54 
55 } // namespace bugprone
56 } // namespace tidy
57 } // namespace clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//