clang  6.0.0svn
OperatorPrecedence.cpp
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1 //===--- OperatorPrecedence.cpp ---------------------------------*- C++ -*-===//
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 /// \file
11 /// \brief Defines and computes precedence levels for binary/ternary operators.
12 ///
13 //===----------------------------------------------------------------------===//
15 
16 namespace clang {
17 
18 prec::Level getBinOpPrecedence(tok::TokenKind Kind, bool GreaterThanIsOperator,
19  bool CPlusPlus11) {
20  switch (Kind) {
21  case tok::greater:
22  // C++ [temp.names]p3:
23  // [...] When parsing a template-argument-list, the first
24  // non-nested > is taken as the ending delimiter rather than a
25  // greater-than operator. [...]
26  if (GreaterThanIsOperator)
27  return prec::Relational;
28  return prec::Unknown;
29 
30  case tok::greatergreater:
31  // C++11 [temp.names]p3:
32  //
33  // [...] Similarly, the first non-nested >> is treated as two
34  // consecutive but distinct > tokens, the first of which is
35  // taken as the end of the template-argument-list and completes
36  // the template-id. [...]
37  if (GreaterThanIsOperator || !CPlusPlus11)
38  return prec::Shift;
39  return prec::Unknown;
40 
41  default: return prec::Unknown;
42  case tok::comma: return prec::Comma;
43  case tok::equal:
44  case tok::starequal:
45  case tok::slashequal:
46  case tok::percentequal:
47  case tok::plusequal:
48  case tok::minusequal:
49  case tok::lesslessequal:
50  case tok::greatergreaterequal:
51  case tok::ampequal:
52  case tok::caretequal:
53  case tok::pipeequal: return prec::Assignment;
54  case tok::question: return prec::Conditional;
55  case tok::pipepipe: return prec::LogicalOr;
56  case tok::caretcaret:
57  case tok::ampamp: return prec::LogicalAnd;
58  case tok::pipe: return prec::InclusiveOr;
59  case tok::caret: return prec::ExclusiveOr;
60  case tok::amp: return prec::And;
61  case tok::exclaimequal:
62  case tok::equalequal: return prec::Equality;
63  case tok::lessequal:
64  case tok::less:
65  case tok::greaterequal: return prec::Relational;
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:25
Dataflow Directional Tag Classes.
prec::Level getBinOpPrecedence(tok::TokenKind Kind, bool GreaterThanIsOperator, bool CPlusPlus11)
Return the precedence of the specified binary operator token.