TypeLocBuilder.h

Go to the documentation of this file.

//===--- TypeLocBuilder.h - Type Source Info collector ----------*- 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 TypeLocBuilder, a class for building TypeLocs
//  bottom-up.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_CLANG_LIB_SEMA_TYPELOCBUILDER_H
#define LLVM_CLANG_LIB_SEMA_TYPELOCBUILDER_H
 
#include "clang/AST/ASTContext.h"
#include "clang/AST/TypeLoc.h"
 
namespace clang {
 
class TypeLocBuilder {
  enum { InlineCapacity = 8 * sizeof(SourceLocation) };
 
  /// The underlying location-data buffer.  Data grows from the end
  /// of the buffer backwards.
  char *Buffer;
 
  /// The capacity of the current buffer.
  size_t Capacity;
 
  /// The index of the first occupied byte in the buffer.
  size_t Index;
 
#ifndef NDEBUG
  /// The last type pushed on this builder.
  QualType LastTy;
#endif
 
  /// The inline buffer.
  enum { BufferMaxAlignment = alignof(void *) };
  alignas(BufferMaxAlignment) char InlineBuffer[InlineCapacity];
  unsigned NumBytesAtAlign4;
  bool AtAlign8;
 
public:
  TypeLocBuilder()
      : Buffer(InlineBuffer), Capacity(InlineCapacity), Index(InlineCapacity),
        NumBytesAtAlign4(0), AtAlign8(false) {}
 
  ~TypeLocBuilder() {
    if (Buffer != InlineBuffer)
      delete[] Buffer;
  }
 
  TypeLocBuilder(const TypeLocBuilder &) = delete;