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1 : //===--- RAIIObjectsForParser.h - RAII helpers for the parser ---*- 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 : // This file defines and implements the some simple RAII objects that are used
11 : // by the parser to manage bits in recursion.
12 : //
13 : //===----------------------------------------------------------------------===//
14 :
15 : #ifndef LLVM_CLANG_PARSE_RAII_OBJECTS_FOR_PARSER_H
16 : #define LLVM_CLANG_PARSE_RAII_OBJECTS_FOR_PARSER_H
17 :
18 : #include "clang/Parse/ParseDiagnostic.h"
19 :
20 : namespace clang {
21 : // TODO: move ParsingDeclRAIIObject here.
22 : // TODO: move ParsingClassDefinition here.
23 : // TODO: move TentativeParsingAction here.
24 :
25 :
26 : /// ExtensionRAIIObject - This saves the state of extension warnings when
27 : /// constructed and disables them. When destructed, it restores them back to
28 : /// the way they used to be. This is used to handle __extension__ in the
29 : /// parser.
30 : class ExtensionRAIIObject {
31 : void operator=(const ExtensionRAIIObject &); // DO NOT IMPLEMENT
32 : ExtensionRAIIObject(const ExtensionRAIIObject&); // DO NOT IMPLEMENT
33 : Diagnostic &Diags;
34 : public:
35 549: ExtensionRAIIObject(Diagnostic &diags) : Diags(diags) {
36 549: Diags.IncrementAllExtensionsSilenced();
37 549: }
38 :
39 549: ~ExtensionRAIIObject() {
40 549: Diags.DecrementAllExtensionsSilenced();
41 549: }
42 : };
43 :
44 : /// ColonProtectionRAIIObject - This sets the Parser::ColonIsSacred bool and
45 : /// restores it when destroyed. This says that "foo:" should not be
46 : /// considered a possible typo for "foo::" for error recovery purposes.
47 : class ColonProtectionRAIIObject {
48 : Parser &P;
49 : bool OldVal;
50 : public:
51 27424: ColonProtectionRAIIObject(Parser &p, bool Value = true)
52 27424: : P(p), OldVal(P.ColonIsSacred) {
53 27424: P.ColonIsSacred = Value;
54 27424: }
55 :
56 : /// restore - This can be used to restore the state early, before the dtor
57 : /// is run.
58 27724: void restore() {
59 27724: P.ColonIsSacred = OldVal;
60 27724: }
61 :
62 27424: ~ColonProtectionRAIIObject() {
63 27424: restore();
64 27424: }
65 : };
66 :
67 : /// \brief RAII object that makes '>' behave either as an operator
68 : /// or as the closing angle bracket for a template argument list.
69 : class GreaterThanIsOperatorScope {
70 : bool &GreaterThanIsOperator;
71 : bool OldGreaterThanIsOperator;
72 : public:
73 12080: GreaterThanIsOperatorScope(bool >IO, bool Val)
74 12080: : GreaterThanIsOperator(GTIO), OldGreaterThanIsOperator(GTIO) {
75 12080: GreaterThanIsOperator = Val;
76 12080: }
77 :
78 12080: ~GreaterThanIsOperatorScope() {
79 12080: GreaterThanIsOperator = OldGreaterThanIsOperator;
80 12080: }
81 : };
82 :
83 : } // end namespace clang
84 :
85 : #endif
Generated: 2010-02-10 01:31 by zcov