path: root/lib/AST/Type.cpp

//===--- Type.cpp - Type representation and manipulation ------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//  This file implements type-related functionality.
//
//===----------------------------------------------------------------------===//

#include "clang/AST/ASTContext.h"
#include "clang/AST/CharUnits.h"
#include "clang/AST/Type.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/Expr.h"
#include "clang/AST/PrettyPrinter.h"
#include "clang/Basic/Specifiers.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
using namespace clang;

bool QualType::isConstant(QualType T, ASTContext &Ctx) {
  if (T.isConstQualified())
    return true;

  if (const ArrayType *AT = Ctx.getAsArrayType(T))
    return AT->getElementType().isConstant(Ctx);

  return false;
}

Type::~Type() { }

unsigned ConstantArrayType::getNumAddressingBits(ASTContext &Context,
                                                 QualType ElementType,
                                               const llvm::APInt &NumElements) {
  llvm::APSInt SizeExtended(NumElements, true);
  unsigned SizeTypeBits = Context.getTypeSize(Context.getSizeType());
  SizeExtended.extend(std::max(SizeTypeBits, SizeExtended.getBitWidth()) * 2);

  uint64_t ElementSize
    = Context.getTypeSizeInChars(ElementType).getQuantity();
  llvm::APSInt TotalSize(llvm::APInt(SizeExtended.getBitWidth(), ElementSize));
  TotalSize *= SizeExtended;  
  
  return TotalSize.