PrettyPrinter.h revision 651f13cea278ec967336033dd032faef0e9fc2ec 
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/LLVM.h"
18#include "clang/Basic/LangOptions.h"
19
20namespace clang {
21
22class LangOptions;
23class SourceManager;
24class Stmt;
25class TagDecl;
26
27class PrinterHelper {
28public:
29  virtual ~PrinterHelper();
30  virtual bool handledStmt(Stmt* E, raw_ostream& OS) = 0;
31};
32
33/// \brief Describes how types, statements, expressions, and
34/// declarations should be printed.
35struct PrintingPolicy {
36  /// \brief Create a default printing policy for C.
37  PrintingPolicy(const LangOptions &LO)
38    : LangOpts(LO), Indentation(2), SuppressSpecifiers(false),
39      SuppressTagKeyword(false), SuppressTag(false), SuppressScope(false),
40      SuppressUnwrittenScope(false), SuppressInitializers(false),
41      ConstantArraySizeAsWritten(false), AnonymousTagLocations(true),
42      SuppressStrongLifetime(false), SuppressLifetimeQualifiers(false),
43      Bool(LO.Bool), TerseOutput(false), PolishForDeclaration(false),
44      Half(LO.Half), MSWChar(LO.MicrosoftExt && !LO.WChar),
45      IncludeNewlines(true) { }
46
47  /// \brief What language we're printing.
48  LangOptions LangOpts;
49
50  /// \brief The number of spaces to use to indent each line.
51  unsigned Indentation : 8;
52
53  /// \brief Whether we should suppress printing of the actual specifiers for
54  /// the given type or declaration.
55  ///
56  /// This flag is only used when we are printing declarators beyond
57  /// the first declarator within a declaration group. For example, given:
58  ///
59  /// \code
60  /// const int *x, *y;
61  /// \endcode
62  ///
63  /// SuppressSpecifiers will be false when printing the
64  /// declaration for "x", so that we will print "int *x"; it will be
65  /// \c true when we print "y", so that we suppress printing the
66  /// "const int" type specifier and instead only print the "*y".
67  bool SuppressSpecifiers : 1;
68
69  /// \brief Whether type printing should skip printing the tag keyword.
70  ///
71  /// This is used when printing the inner type of elaborated types,
72  /// (as the tag keyword is part of the elaborated type):
73  ///
74  /// \code
75  /// struct Geometry::Point;
76  /// \endcode
77  bool SuppressTagKeyword : 1;
78
79  /// \brief Whether type printing should skip printing the actual tag type.
80  ///
81  /// This is used when the caller needs to print a tag definition in front
82  /// of the type, as in constructs like the following:
83  ///
84  /// \code
85  /// typedef struct { int x, y; } Point;
86  /// \endcode
87  bool SuppressTag : 1;
88
89  /// \brief Suppresses printing of scope specifiers.
90  bool SuppressScope : 1;
91
92  /// \brief Suppress printing parts of scope specifiers that don't need
93  /// to be written, e.g., for inline or anonymous namespaces.
94  bool SuppressUnwrittenScope : 1;
95
96  /// \brief Suppress printing of variable initializers.
97  ///
98  /// This flag is used when printing the loop variable in a for-range
99  /// statement. For example, given:
100  ///
101  /// \code
102  /// for (auto x : coll)
103  /// \endcode
104  ///
105  /// SuppressInitializers will be true when printing "auto x", so that the
106  /// internal initializer constructed for x will not be printed.
107  bool SuppressInitializers : 1;
108
109  /// \brief Whether we should print the sizes of constant array expressions
110  /// as written in the sources.
111  ///
112  /// This flag is determines whether arrays types declared as
113  ///
114  /// \code
115  /// int a[4+10*10];
116  /// char a[] = "A string";
117  /// \endcode
118  ///
119  /// will be printed as written or as follows:
120  ///
121  /// \code
122  /// int a[104];
123  /// char a[9] = "A string";
124  /// \endcode
125  bool ConstantArraySizeAsWritten : 1;
126
127  /// \brief When printing an anonymous tag name, also print the location of
128  /// that entity (e.g., "enum <anonymous at t.h:10:5>"). Otherwise, just
129  /// prints "(anonymous)" for the name.
130  bool AnonymousTagLocations : 1;
131
132  /// \brief When true, suppress printing of the __strong lifetime qualifier in
133  /// ARC.
134  unsigned SuppressStrongLifetime : 1;
135
136  /// \brief When true, suppress printing of lifetime qualifier in
137  /// ARC.
138  unsigned SuppressLifetimeQualifiers : 1;
139
140  /// \brief Whether we can use 'bool' rather than '_Bool', even if the language
141  /// doesn't actually have 'bool' (because, e.g., it is defined as a macro).
142  unsigned Bool : 1;
143
144  /// \brief Provide a 'terse' output.
145  ///
146  /// For example, in this mode we don't print function bodies, class members,
147  /// declarations inside namespaces etc.  Effectively, this should print
148  /// only the requested declaration.
149  unsigned TerseOutput : 1;
150
151  /// \brief When true, do certain refinement needed for producing proper
152  /// declaration tag; such as, do not print attributes attached to the declaration.
153  ///
154  unsigned PolishForDeclaration : 1;
155
156  /// \brief When true, print the half-precision floating-point type as 'half'
157  /// instead of '__fp16'
158  unsigned Half : 1;
159
160  /// \brief When true, print the built-in wchar_t type as __wchar_t. For use in
161  /// Microsoft mode when wchar_t is not available.
162  unsigned MSWChar : 1;
163
164  /// \brief When true, include newlines after statements like "break", etc.
165  unsigned IncludeNewlines : 1;
166};
167
168} // end namespace clang
169
170#endif
171