clang  10.0.0svn
OperatorPrecedence.cpp
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1 //===--- OperatorPrecedence.cpp ---------------------------------*- C++ -*-===//
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 /// \file
10 /// Defines and computes precedence levels for binary/ternary operators.
11 ///
12 //===----------------------------------------------------------------------===//
14 
15 namespace clang {
16 
17 prec::Level getBinOpPrecedence(tok::TokenKind Kind, bool GreaterThanIsOperator,
18  bool CPlusPlus11) {
19  switch (Kind) {
20  case tok::greater:
21  // C++ [temp.names]p3:
22  // [...] When parsing a template-argument-list, the first
23  // non-nested > is taken as the ending delimiter rather than a
24  // greater-than operator. [...]
25  if (GreaterThanIsOperator)
26  return prec::Relational;
27  return prec::Unknown;
28 
29  case tok::greatergreater:
30  // C++11 [temp.names]p3:
31  //
32  // [...] Similarly, the first non-nested >> is treated as two
33  // consecutive but distinct > tokens, the first of which is
34  // taken as the end of the template-argument-list and completes
35  // the template-id. [...]
36  if (GreaterThanIsOperator || !CPlusPlus11)
37  return prec::Shift;
38  return prec::Unknown;
39 
40  default: return prec::Unknown;
41  case tok::comma: return prec::Comma;
42  case tok::equal:
43  case tok::starequal:
44  case tok::slashequal:
45  case tok::percentequal:
46  case tok::plusequal:
47  case tok::minusequal:
48  case tok::lesslessequal:
49  case tok::greatergreaterequal:
50  case tok::ampequal:
51  case tok::caretequal:
52  case tok::pipeequal: return prec::Assignment;
53  case tok::question: return prec::Conditional;
54  case tok::pipepipe: return prec::LogicalOr;
55  case tok::caretcaret:
56  case tok::ampamp: return prec::LogicalAnd;
57  case tok::pipe: return prec::InclusiveOr;
58  case tok::caret: return prec::ExclusiveOr;
59  case tok::amp: return prec::And;
60  case tok::exclaimequal:
61  case tok::equalequal: return prec::Equality;
62  case tok::lessequal:
63  case tok::less:
64  case tok::greaterequal: return prec::Relational;
65  case tok::spaceship: return prec::Spaceship;
66  case tok::lessless: return prec::Shift;
67  case tok::plus:
68  case tok::minus: return prec::Additive;
69  case tok::percent:
70  case tok::slash:
71  case tok::star: return prec::Multiplicative;
72  case tok::periodstar:
73  case tok::arrowstar: return prec::PointerToMember;
74  }
75 }
76 
77 } // namespace clang
Defines and computes precedence levels for binary/ternary operators.
Kind
TokenKind
Provides a simple uniform namespace for tokens from all C languages.
Definition: TokenKinds.h:24
Dataflow Directional Tag Classes.
prec::Level getBinOpPrecedence(tok::TokenKind Kind, bool GreaterThanIsOperator, bool CPlusPlus11)
Return the precedence of the specified binary operator token.