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 /// Describes how types, statements, expressions, and declarations should be
36 /// This type is intended to be small and suitable for passing by value.
37 /// It is very frequently copied.
38 struct PrintingPolicy {
39 /// Create a default printing policy for the specified language.
40 PrintingPolicy(const LangOptions &LO)
41 : Indentation(2), SuppressSpecifiers(false),
42 SuppressTagKeyword(LO.CPlusPlus), IncludeTagDefinition(false),
43 SuppressScope(false), SuppressUnwrittenScope(false),
44 SuppressInitializers(false), ConstantArraySizeAsWritten(false),
45 AnonymousTagLocations(true), SuppressStrongLifetime(false),
46 SuppressLifetimeQualifiers(false),
47 SuppressTemplateArgsInCXXConstructors(false), Bool(LO.Bool),
48 Restrict(LO.C99), Alignof(LO.CPlusPlus11), UnderscoreAlignof(LO.C11),
49 UseVoidForZeroParams(!LO.CPlusPlus), TerseOutput(false),
50 PolishForDeclaration(false), Half(LO.Half),
51 MSWChar(LO.MicrosoftExt && !LO.WChar), IncludeNewlines(true),
52 MSVCFormatting(false), ConstantsAsWritten(false),
53 SuppressImplicitBase(false), FullyQualifiedName(false),
54 RemapFilePaths(false), PrintCanonicalTypes(false) {}
56 /// Adjust this printing policy for cases where it's known that we're
57 /// printing C++ code (for instance, if AST dumping reaches a C++-only
58 /// construct). This should not be used if a real LangOptions object is
60 void adjustForCPlusPlus() {
61 SuppressTagKeyword = true;
63 UseVoidForZeroParams = false;
66 /// The number of spaces to use to indent each line.
67 unsigned Indentation : 8;
69 /// Whether we should suppress printing of the actual specifiers for
70 /// the given type or declaration.
72 /// This flag is only used when we are printing declarators beyond
73 /// the first declarator within a declaration group. For example, given:
79 /// SuppressSpecifiers will be false when printing the
80 /// declaration for "x", so that we will print "int *x"; it will be
81 /// \c true when we print "y", so that we suppress printing the
82 /// "const int" type specifier and instead only print the "*y".
83 unsigned SuppressSpecifiers : 1;
85 /// Whether type printing should skip printing the tag keyword.
87 /// This is used when printing the inner type of elaborated types,
88 /// (as the tag keyword is part of the elaborated type):
91 /// struct Geometry::Point;
93 unsigned SuppressTagKeyword : 1;
95 /// When true, include the body of a tag definition.
97 /// This is used to place the definition of a struct
98 /// in the middle of another declaration as with:
101 /// typedef struct { int x, y; } Point;
103 unsigned IncludeTagDefinition : 1;
105 /// Suppresses printing of scope specifiers.
106 unsigned SuppressScope : 1;
108 /// Suppress printing parts of scope specifiers that don't need
109 /// to be written, e.g., for inline or anonymous namespaces.
110 unsigned SuppressUnwrittenScope : 1;
112 /// Suppress printing of variable initializers.
114 /// This flag is used when printing the loop variable in a for-range
115 /// statement. For example, given:
118 /// for (auto x : coll)
121 /// SuppressInitializers will be true when printing "auto x", so that the
122 /// internal initializer constructed for x will not be printed.
123 unsigned SuppressInitializers : 1;
125 /// Whether we should print the sizes of constant array expressions as written
128 /// This flag determines whether array types declared as
132 /// char a[] = "A string";
135 /// will be printed as written or as follows:
139 /// char a[9] = "A string";
141 unsigned ConstantArraySizeAsWritten : 1;
143 /// When printing an anonymous tag name, also print the location of that
144 /// entity (e.g., "enum <anonymous at t.h:10:5>"). Otherwise, just prints
145 /// "(anonymous)" for the name.
146 unsigned AnonymousTagLocations : 1;
148 /// When true, suppress printing of the __strong lifetime qualifier in ARC.
149 unsigned SuppressStrongLifetime : 1;
151 /// When true, suppress printing of lifetime qualifier in ARC.
152 unsigned SuppressLifetimeQualifiers : 1;
154 /// When true, suppresses printing template arguments in names of C++
156 unsigned SuppressTemplateArgsInCXXConstructors : 1;
158 /// Whether we can use 'bool' rather than '_Bool' (even if the language
159 /// doesn't actually have 'bool', because, e.g., it is defined as a macro).
162 /// Whether we can use 'restrict' rather than '__restrict'.
163 unsigned Restrict : 1;
165 /// Whether we can use 'alignof' rather than '__alignof'.
166 unsigned Alignof : 1;
168 /// Whether we can use '_Alignof' rather than '__alignof'.
169 unsigned UnderscoreAlignof : 1;
171 /// Whether we should use '(void)' rather than '()' for a function prototype
172 /// with zero parameters.
173 unsigned UseVoidForZeroParams : 1;
175 /// Provide a 'terse' output.
177 /// For example, in this mode we don't print function bodies, class members,
178 /// declarations inside namespaces etc. Effectively, this should print
179 /// only the requested declaration.
180 unsigned TerseOutput : 1;
182 /// When true, do certain refinement needed for producing proper declaration
183 /// tag; such as, do not print attributes attached to the declaration.
185 unsigned PolishForDeclaration : 1;
187 /// When true, print the half-precision floating-point type as 'half'
188 /// instead of '__fp16'
191 /// When true, print the built-in wchar_t type as __wchar_t. For use in
192 /// Microsoft mode when wchar_t is not available.
193 unsigned MSWChar : 1;
195 /// When true, include newlines after statements like "break", etc.
196 unsigned IncludeNewlines : 1;
198 /// Use whitespace and punctuation like MSVC does. In particular, this prints
199 /// anonymous namespaces as `anonymous namespace' and does not insert spaces
200 /// after template arguments.
201 unsigned MSVCFormatting : 1;
203 /// Whether we should print the constant expressions as written in the
206 /// This flag determines whether constants expressions like
213 /// will be printed as written or as follows:
219 unsigned ConstantsAsWritten : 1;
221 /// When true, don't print the implicit 'self' or 'this' expressions.
222 unsigned SuppressImplicitBase : 1;
224 /// When true, print the fully qualified name of function declarations.
225 /// This is the opposite of SuppressScope and thus overrules it.
226 unsigned FullyQualifiedName : 1;
228 /// Whether to apply -fdebug-prefix-map to any file paths.
229 unsigned RemapFilePaths : 1;
231 /// Whether to print types as written or canonically.
232 unsigned PrintCanonicalTypes : 1;
234 /// When RemapFilePaths is true, this function performs the action.
235 std::function<std::string(StringRef)> remapPath;
238 } // end namespace clang