Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===--- PrettyPrinter.h - Classes for aiding with AST printing -*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

//  This file defines helper types for AST pretty-printing.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_AST_PRETTYPRINTER_H

#define LLVM_CLANG_AST_PRETTYPRINTER_H

#include "clang/Basic/LLVM.h"

#include "clang/Basic/LangOptions.h"

namespace clang {

class DeclContext;

class LangOptions;

class Stmt;

class PrinterHelper {

public:

  virtual ~PrinterHelper();

  virtual bool handledStmt(Stmt* E, raw_ostream& OS) = 0;

};

/// Callbacks to use to customize the behavior of the pretty-printer.

class PrintingCallbacks {

protected:

  ~PrintingCallbacks() = default;

public:

  /// Remap a path to a form suitable for printing.

  virtual std::string remapPath(StringRef Path) const {

    return std::string(Path);

  }

  /// When printing type to be inserted into code in specific context, this

  /// callback can be used to avoid printing the redundant part of the

  /// qualifier. For example, when inserting code inside namespace foo, we

  /// should print bar::SomeType instead of foo::bar::SomeType.

  /// To do this, shouldPrintScope should return true on "foo" NamespaceDecl.

  /// The printing stops at the first isScopeVisible() == true, so there will

  /// be no calls with outer scopes.

  virtual bool isScopeVisible(const DeclContext *DC) const { return false; }

};

/// Describes how types, statements, expressions, and declarations should be

/// printed.

///

/// This type is intended to be small and suitable for passing by value.

/// It is very frequently copied.

struct PrintingPolicy {

  /// Create a default printing policy for the specified language.

  PrintingPolicy(const LangOptions &LO)

      : Indentation(2), SuppressSpecifiers(false),

        SuppressTagKeyword(LO.CPlusPlus), IncludeTagDefinition(false),

        SuppressScope(false), SuppressUnwrittenScope(false),

        SuppressInlineNamespace(true), SuppressInitializers(false),

        ConstantArraySizeAsWritten(false), AnonymousTagLocations(true),

        SuppressStrongLifetime(false), SuppressLifetimeQualifiers(false),

        SuppressTemplateArgsInCXXConstructors(false),

        SuppressDefaultTemplateArgs(true), Bool(LO.Bool),

        Nullptr(LO.CPlusPlus11 || LO.C2x), NullptrTypeInNamespace(LO.CPlusPlus),

        Restrict(LO.C99), Alignof(LO.CPlusPlus11),

        UnderscoreAlignof(LO.C11), UseVoidForZeroParams(!LO.CPlusPlus),

        SplitTemplateClosers(!LO.CPlusPlus11), TerseOutput(false),

        PolishForDeclaration(false), Half(LO.Half),

        MSWChar(LO.MicrosoftExt && !LO.WChar), IncludeNewlines(true),

        MSVCFormatting(false), ConstantsAsWritten(false),

        SuppressImplicitBase(false), FullyQualifiedName(false),

        PrintCanonicalTypes(false), PrintInjectedClassNameWithArguments(true),

        UsePreferredNames(true), AlwaysIncludeTypeForTemplateArgument(false),

        CleanUglifiedParameters(false), EntireContentsOfLargeArray(true),

        UseEnumerators(true) {}

  /// Adjust this printing policy for cases where it's known that we're

  /// printing C++ code (for instance, if AST dumping reaches a C++-only

  /// construct). This should not be used if a real LangOptions object is

  /// available.

  void adjustForCPlusPlus() {

    SuppressTagKeyword = true;

    Bool = true;

    UseVoidForZeroParams = false;

  }

  /// The number of spaces to use to indent each line.

  unsigned Indentation : 8;

  /// Whether we should suppress printing of the actual specifiers for

  /// the given type or declaration.

  ///

  /// This flag is only used when we are printing declarators beyond

  /// the first declarator within a declaration group. For example, given:

  ///

  /// \code

  /// const int *x, *y;

  /// \endcode

  ///

  /// SuppressSpecifiers will be false when printing the

  /// declaration for "x", so that we will print "int *x"; it will be

  /// \c true when we print "y", so that we suppress printing the

  /// "const int" type specifier and instead only print the "*y".

  unsigned SuppressSpecifiers : 1;

  /// Whether type printing should skip printing the tag keyword.

  ///

  /// This is used when printing the inner type of elaborated types,

  /// (as the tag keyword is part of the elaborated type):

  ///

  /// \code

  /// struct Geometry::Point;

  /// \endcode

  unsigned SuppressTagKeyword : 1;

  /// When true, include the body of a tag definition.

  ///

  /// This is used to place the definition of a struct

  /// in the middle of another declaration as with:

  ///

  /// \code

  /// typedef struct { int x, y; } Point;

  /// \endcode

  unsigned IncludeTagDefinition : 1;

  /// Suppresses printing of scope specifiers.

  unsigned SuppressScope : 1;

  /// Suppress printing parts of scope specifiers that are never

  /// written, e.g., for anonymous namespaces.

  unsigned SuppressUnwrittenScope : 1;

  /// Suppress printing parts of scope specifiers that correspond

  /// to inline namespaces, where the name is unambiguous with the specifier

  /// removed.

  unsigned SuppressInlineNamespace : 1;

  /// Suppress printing of variable initializers.

  ///

  /// This flag is used when printing the loop variable in a for-range

  /// statement. For example, given:

  ///

  /// \code

  /// for (auto x : coll)

  /// \endcode

  ///

  /// SuppressInitializers will be true when printing "auto x", so that the

  /// internal initializer constructed for x will not be printed.

  unsigned SuppressInitializers : 1;

  /// Whether we should print the sizes of constant array expressions as written

  /// in the sources.

  ///

  /// This flag determines whether array types declared as

  ///

  /// \code

  /// int a[4+10*10];

  /// char a[] = "A string";

  /// \endcode

  ///

  /// will be printed as written or as follows:

  ///

  /// \code

  /// int a[104];

  /// char a[9] = "A string";

  /// \endcode

  unsigned ConstantArraySizeAsWritten : 1;

  /// When printing an anonymous tag name, also print the location of that

  /// entity (e.g., "enum <anonymous at t.h:10:5>"). Otherwise, just prints

  /// "(anonymous)" for the name.

  unsigned AnonymousTagLocations : 1;

  /// When true, suppress printing of the __strong lifetime qualifier in ARC.

  unsigned SuppressStrongLifetime : 1;

  /// When true, suppress printing of lifetime qualifier in ARC.

  unsigned SuppressLifetimeQualifiers : 1;

  /// When true, suppresses printing template arguments in names of C++

  /// constructors.

  unsigned SuppressTemplateArgsInCXXConstructors : 1;

  /// When true, attempt to suppress template arguments that match the default

  /// argument for the parameter.

  unsigned SuppressDefaultTemplateArgs : 1;

  /// Whether we can use 'bool' rather than '_Bool' (even if the language

  /// doesn't actually have 'bool', because, e.g., it is defined as a macro).

  unsigned Bool : 1;

  /// Whether we should use 'nullptr' rather than '0' as a null pointer

  /// constant.

  unsigned Nullptr : 1;

  /// Whether 'nullptr_t' is in namespace 'std' or not.

  unsigned NullptrTypeInNamespace : 1;

  /// Whether we can use 'restrict' rather than '__restrict'.

  unsigned Restrict : 1;

  /// Whether we can use 'alignof' rather than '__alignof'.

  unsigned Alignof : 1;

  /// Whether we can use '_Alignof' rather than '__alignof'.

  unsigned UnderscoreAlignof : 1;

  /// Whether we should use '(void)' rather than '()' for a function prototype

  /// with zero parameters.

  unsigned UseVoidForZeroParams : 1;

  /// Whether nested templates must be closed like 'a\<b\<c\> \>' rather than

  /// 'a\<b\<c\>\>'.

  unsigned SplitTemplateClosers : 1;

  /// Provide a 'terse' output.

  ///

  /// For example, in this mode we don't print function bodies, class members,

  /// declarations inside namespaces etc.  Effectively, this should print

  /// only the requested declaration.

  unsigned TerseOutput : 1;

  /// When true, do certain refinement needed for producing proper declaration

  /// tag; such as, do not print attributes attached to the declaration.

  ///

  unsigned PolishForDeclaration : 1;

  /// When true, print the half-precision floating-point type as 'half'

  /// instead of '__fp16'

  unsigned Half : 1;

  /// When true, print the built-in wchar_t type as __wchar_t. For use in

  /// Microsoft mode when wchar_t is not available.

  unsigned MSWChar : 1;

  /// When true, include newlines after statements like "break", etc.

  unsigned IncludeNewlines : 1;

  /// Use whitespace and punctuation like MSVC does. In particular, this prints

  /// anonymous namespaces as `anonymous namespace' and does not insert spaces

  /// after template arguments.

  unsigned MSVCFormatting : 1;

  /// Whether we should print the constant expressions as written in the

  /// sources.

  ///

  /// This flag determines whether constants expressions like

  ///

  /// \code

  /// 0x10

  /// 2.5e3

  /// \endcode

  ///

  /// will be printed as written or as follows:

  ///

  /// \code

  /// 0x10

  /// 2.5e3

  /// \endcode

  unsigned ConstantsAsWritten : 1;

  /// When true, don't print the implicit 'self' or 'this' expressions.

  unsigned SuppressImplicitBase : 1;

  /// When true, print the fully qualified name of function declarations.

  /// This is the opposite of SuppressScope and thus overrules it.

  unsigned FullyQualifiedName : 1;

  /// Whether to print types as written or canonically.

  unsigned PrintCanonicalTypes : 1;

  /// Whether to print an InjectedClassNameType with template arguments or as

  /// written. When a template argument is unnamed, printing it results in

  /// invalid C++ code.

  unsigned PrintInjectedClassNameWithArguments : 1;

  /// Whether to use C++ template preferred_name attributes when printing

  /// templates.

  unsigned UsePreferredNames : 1;

  /// Whether to use type suffixes (eg: 1U) on integral non-type template

  /// parameters.

  unsigned AlwaysIncludeTypeForTemplateArgument : 1;

  /// Whether to strip underscores when printing reserved parameter names.

  /// e.g. std::vector<class _Tp> becomes std::vector<class Tp>.

  /// This only affects parameter names, and so describes a compatible API.

  unsigned CleanUglifiedParameters : 1;

  /// Whether to print the entire array initializers, especially on non-type

  /// template parameters, no matter how many elements there are.

  unsigned EntireContentsOfLargeArray : 1;

  /// Whether to print enumerator non-type template parameters with a matching

  /// enumerator name or via cast of an integer.

  unsigned UseEnumerators : 1;

  /// Callbacks to use to allow the behavior of printing to be customized.

  const PrintingCallbacks *Callbacks = nullptr;

};

} // end namespace clang

#endif