PrettyPrinter.h revision 1bfb00dabf83d8c8b95b7276b4c0ae3fd64832c8 
1//===--- PrettyPrinter.h - Classes for aiding with AST printing -*- 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 the PrinterHelper interface.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_AST_PRETTY_PRINTER_H
15#define LLVM_CLANG_AST_PRETTY_PRINTER_H
16
17#include "clang/Basic/LangOptions.h"
18#include "clang/Basic/LLVM.h"
19
20namespace clang {
21
22class Stmt;
23class TagDecl;
24class LangOptions;
25
26class PrinterHelper {
27public:
28  virtual ~PrinterHelper();
29  virtual bool handledStmt(Stmt* E, raw_ostream& OS) = 0;
30};
31
32/// \brief Describes how types, statements, expressions, and
33/// declarations should be printed.
34struct PrintingPolicy {
35  /// \brief Create a default printing policy for C.
36  PrintingPolicy(const LangOptions &LO)
37    : LangOpts(LO), Indentation(2), SuppressSpecifiers(false),
38      SuppressTagKeyword(false), SuppressTag(false), SuppressScope(false),
39      SuppressUnwrittenScope(false), SuppressInitializers(false),
40      ConstantArraySizeAsWritten(false), AnonymousTagLocations(true),
41      SuppressStrongLifetime(false), Bool(LO.Bool),
42      TerseOutput(false), SuppressAttributes(false),
43      DumpSourceManager(0) { }
44
45  /// \brief What language we're printing.
46  LangOptions LangOpts;
47
48  /// \brief The number of spaces to use to indent each line.
49  unsigned Indentation : 8;
50
51  /// \brief Whether we should suppress printing of the actual specifiers for
52  /// the given type or declaration.
53  ///
54  /// This flag is only used when we are printing declarators beyond
55  /// the first declarator within a declaration group. For example, given:
56  ///
57  /// \code
58  /// const int *x, *y;
59  /// \endcode
60  ///
61  /// SuppressSpecifiers will be false when printing the
62  /// declaration for "x", so that we will print "int *x"; it will be
63  /// \c true when we print "y", so that we suppress printing the
64  /// "const int" type specifier and instead only print the "*y".
65  bool SuppressSpecifiers : 1;
66
67  /// \brief Whether type printing should skip printing the tag keyword.
68  ///
69  /// This is used when printing the inner type of elaborated types,
70  /// (as the tag keyword is part of the elaborated type):
71  ///
72  /// \code
73  /// struct Geometry::Point;
74  /// \endcode
75  bool SuppressTagKeyword : 1;
76
77  /// \brief Whether type printing should skip printing the actual tag type.
78  ///
79  /// This is used when the caller needs to print a tag definition in front
80  /// of the type, as in constructs like the following:
81  ///
82  /// \code
83  /// typedef struct { int x, y; } Point;
84  /// \endcode
85  bool SuppressTag : 1;
86
87  /// \brief Suppresses printing of scope specifiers.
88  bool SuppressScope : 1;
89
90  /// \brief Suppress printing parts of scope specifiers that don't need
91  /// to be written, e.g., for inline or anonymous namespaces.
92  bool SuppressUnwrittenScope : 1;
93
94  /// \brief Suppress printing of variable initializers.
95  ///
96  /// This flag is used when printing the loop variable in a for-range
97  /// statement. For example, given:
98  ///
99  /// \code
100  /// for (auto x : coll)
101  /// \endcode
102  ///
103  /// SuppressInitializers will be true when printing "auto x", so that the
104  /// internal initializer constructed for x will not be printed.
105  bool SuppressInitializers : 1;
106
107  /// \brief Whether we should print the sizes of constant array expressions
108  /// as written in the sources.
109  ///
110  /// This flag is determines whether arrays types declared as
111  ///
112  /// \code
113  /// int a[4+10*10];
114  /// char a[] = "A string";
115  /// \endcode
116  ///
117  /// will be printed as written or as follows:
118  ///
119  /// \code
120  /// int a[104];
121  /// char a[9] = "A string";
122  /// \endcode
123  bool ConstantArraySizeAsWritten : 1;
124
125  /// \brief When printing an anonymous tag name, also print the location of
126  /// that entity (e.g., "enum <anonymous at t.h:10:5>"). Otherwise, just
127  /// prints "<anonymous>" for the name.
128  bool AnonymousTagLocations : 1;
129
130  /// \brief When true, suppress printing of the __strong lifetime qualifier in
131  /// ARC.
132  unsigned SuppressStrongLifetime : 1;
133
134  /// \brief Whether we can use 'bool' rather than '_Bool', even if the language
135  /// doesn't actually have 'bool' (because, e.g., it is defined as a macro).
136  unsigned Bool : 1;
137
138  /// \brief Provide a 'terse' output.
139  ///
140  /// For example, in this mode we don't print function bodies, class members,
141  /// declarations inside namespaces etc.  Effectively, this should print
142  /// only the requested declaration.
143  unsigned TerseOutput : 1;
144
145  /// \brief When true, do not print attributes attached to the declaration.
146  ///
147  unsigned SuppressAttributes : 1;
148
149  /// \brief If we are "dumping" rather than "pretty-printing", this points to
150  /// a SourceManager which will be used to dump SourceLocations. Dumping
151  /// involves printing the internal details of the AST and pretty-printing
152  /// involves printing something similar to source code.
153  SourceManager *DumpSourceManager;
154};
155
156} // end namespace clang
157
158#endif
159