//===--- 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