1 //===--- PrettyPrinter.h - Classes for aiding with AST printing -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the PrinterHelper interface.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_AST_PRETTYPRINTER_H
15 #define LLVM_CLANG_AST_PRETTYPRINTER_H
17 #include "clang/Basic/LLVM.h"
18 #include "clang/Basic/LangOptions.h"
29 virtual ~PrinterHelper();
30 virtual bool handledStmt(Stmt* E, raw_ostream& OS) = 0;
33 /// \brief Describes how types, statements, expressions, and
34 /// declarations should be printed.
36 /// This type is intended to be small and suitable for passing by value.
37 /// It is very frequently copied.
38 struct PrintingPolicy {
39 /// \brief Create a default printing policy for the specified language.
40 PrintingPolicy(const LangOptions &LO)
41 : Indentation(2), SuppressSpecifiers(false),
42 SuppressTagKeyword(LO.CPlusPlus),
43 IncludeTagDefinition(false), SuppressScope(false),
44 SuppressUnwrittenScope(false), SuppressInitializers(false),
45 ConstantArraySizeAsWritten(false), AnonymousTagLocations(true),
46 SuppressStrongLifetime(false), SuppressLifetimeQualifiers(false),
47 SuppressTemplateArgsInCXXConstructors(false),
48 Bool(LO.Bool), Restrict(LO.C99),
49 Alignof(LO.CPlusPlus11), UnderscoreAlignof(LO.C11),
50 UseVoidForZeroParams(!LO.CPlusPlus),
51 TerseOutput(false), PolishForDeclaration(false),
52 Half(LO.Half), MSWChar(LO.MicrosoftExt && !LO.WChar),
53 IncludeNewlines(true), MSVCFormatting(false) { }
55 /// \brief Adjust this printing policy for cases where it's known that
56 /// we're printing C++ code (for instance, if AST dumping reaches a
57 /// C++-only construct). This should not be used if a real LangOptions
58 /// object is available.
59 void adjustForCPlusPlus() {
60 SuppressTagKeyword = true;
62 UseVoidForZeroParams = false;
65 /// \brief The number of spaces to use to indent each line.
66 unsigned Indentation : 8;
68 /// \brief Whether we should suppress printing of the actual specifiers for
69 /// the given type or declaration.
71 /// This flag is only used when we are printing declarators beyond
72 /// the first declarator within a declaration group. For example, given:
78 /// SuppressSpecifiers will be false when printing the
79 /// declaration for "x", so that we will print "int *x"; it will be
80 /// \c true when we print "y", so that we suppress printing the
81 /// "const int" type specifier and instead only print the "*y".
82 bool SuppressSpecifiers : 1;
84 /// \brief Whether type printing should skip printing the tag keyword.
86 /// This is used when printing the inner type of elaborated types,
87 /// (as the tag keyword is part of the elaborated type):
90 /// struct Geometry::Point;
92 bool SuppressTagKeyword : 1;
94 /// \brief When true, include the body of a tag definition.
96 /// This is used to place the definition of a struct
97 /// in the middle of another declaration as with:
100 /// typedef struct { int x, y; } Point;
102 bool IncludeTagDefinition : 1;
104 /// \brief Suppresses printing of scope specifiers.
105 bool SuppressScope : 1;
107 /// \brief Suppress printing parts of scope specifiers that don't need
108 /// to be written, e.g., for inline or anonymous namespaces.
109 bool SuppressUnwrittenScope : 1;
111 /// \brief Suppress printing of variable initializers.
113 /// This flag is used when printing the loop variable in a for-range
114 /// statement. For example, given:
117 /// for (auto x : coll)
120 /// SuppressInitializers will be true when printing "auto x", so that the
121 /// internal initializer constructed for x will not be printed.
122 bool SuppressInitializers : 1;
124 /// \brief Whether we should print the sizes of constant array expressions
125 /// as written in the sources.
127 /// This flag determines whether array types declared as
131 /// char a[] = "A string";
134 /// will be printed as written or as follows:
138 /// char a[9] = "A string";
140 bool ConstantArraySizeAsWritten : 1;
142 /// \brief When printing an anonymous tag name, also print the location of
143 /// that entity (e.g., "enum <anonymous at t.h:10:5>"). Otherwise, just
144 /// prints "(anonymous)" for the name.
145 bool AnonymousTagLocations : 1;
147 /// \brief When true, suppress printing of the __strong lifetime qualifier in
149 unsigned SuppressStrongLifetime : 1;
151 /// \brief When true, suppress printing of lifetime qualifier in
153 unsigned SuppressLifetimeQualifiers : 1;
155 /// When true, suppresses printing template arguments in names of C++
157 unsigned SuppressTemplateArgsInCXXConstructors : 1;
159 /// \brief Whether we can use 'bool' rather than '_Bool' (even if the language
160 /// doesn't actually have 'bool', because, e.g., it is defined as a macro).
163 /// \brief Whether we can use 'restrict' rather than '__restrict'.
164 unsigned Restrict : 1;
166 /// \brief Whether we can use 'alignof' rather than '__alignof'.
167 unsigned Alignof : 1;
169 /// \brief Whether we can use '_Alignof' rather than '__alignof'.
170 unsigned UnderscoreAlignof : 1;
172 /// \brief Whether we should use '(void)' rather than '()' for a function
173 /// prototype with zero parameters.
174 unsigned UseVoidForZeroParams : 1;
176 /// \brief Provide a 'terse' output.
178 /// For example, in this mode we don't print function bodies, class members,
179 /// declarations inside namespaces etc. Effectively, this should print
180 /// only the requested declaration.
181 unsigned TerseOutput : 1;
183 /// \brief When true, do certain refinement needed for producing proper
184 /// declaration tag; such as, do not print attributes attached to the declaration.
186 unsigned PolishForDeclaration : 1;
188 /// \brief When true, print the half-precision floating-point type as 'half'
189 /// instead of '__fp16'
192 /// \brief When true, print the built-in wchar_t type as __wchar_t. For use in
193 /// Microsoft mode when wchar_t is not available.
194 unsigned MSWChar : 1;
196 /// \brief When true, include newlines after statements like "break", etc.
197 unsigned IncludeNewlines : 1;
199 /// \brief Use whitespace and punctuation like MSVC does. In particular, this
200 /// prints anonymous namespaces as `anonymous namespace' and does not insert
201 /// spaces after template arguments.
202 bool MSVCFormatting : 1;
205 } // end namespace clang