//===- lib/MC/MCSymbol.cpp - MCSymbol implementation ----------------------===//

//

//                     The LLVM Compiler Infrastructure

//

// This file is distributed under the University of Illinois Open Source

// License. See LICENSE.TXT for details.

//

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

#include "llvm/MC/MCSymbol.h"

#include "llvm/MC/MCAsmInfo.h"

#include "llvm/MC/MCContext.h"

#include "llvm/MC/MCExpr.h"

#include "llvm/Support/Debug.h"

#include "llvm/Support/ErrorHandling.h"

#include "llvm/Support/raw_ostream.h"

using namespace llvm_ks;

// Only the address of this fragment is ever actually used.

static MCDummyFragment SentinelFragment(nullptr);

// Sentinel value for the absolute pseudo fragment.

MCFragment *MCSymbol::AbsolutePseudoFragment = &SentinelFragment;

void *MCSymbol::operator new(size_t s, const StringMapEntry<bool> *Name,

                             MCContext &Ctx) {

  // We may need more space for a Name to account for alignment.  So allocate

  // space for the storage type and not the name pointer.

  size_t Size = s + (Name ? sizeof(NameEntryStorageTy) : 0);

  // For safety, ensure that the alignment of a pointer is enough for an

  // MCSymbol.  This also ensures we don't need padding between the name and

  // symbol.

  static_assert((unsigned)AlignOf<MCSymbol>::Alignment <=

                AlignOf<NameEntryStorageTy>::Alignment,

                "Bad alignment of MCSymbol");

  void *Storage = Ctx.allocate(Size, alignOf<NameEntryStorageTy>());

  NameEntryStorageTy *Start = static_cast<NameEntryStorageTy*>(Storage);

  NameEntryStorageTy *End = Start + (Name ? 1 : 0);

  return End;

}

void MCSymbol::setVariableValue(const MCExpr *Value, bool &valid) {

  valid = true;

  //assert(!IsUsed && "Cannot set a variable that has already been used.");

  //assert(Value && "Invalid variable value!");

  //assert((SymbolContents == SymContentsUnset ||

  //        SymbolContents == SymContentsVariable) &&

  //       "Cannot give common/offset symbol a variable value");

  if (IsUsed || !Value || (SymbolContents != SymContentsUnset &&

              SymbolContents != SymContentsVariable)) {

      valid = false;

      return;

  }

  this->Value = Value;

  SymbolContents = SymContentsVariable;

  setUndefined();

}

void MCSymbol::print(raw_ostream &OS, const MCAsmInfo *MAI) const {

  // The name for this MCSymbol is required to be a valid target name.  However,

  // some targets support quoting names with funny characters.  If the name

  // contains a funny character, then print it quoted.

  StringRef Name = getName();

  if (!MAI || MAI->isValidUnquotedName(Name)) {

    OS << Name;

    return;

  }

  if (MAI && !MAI->supportsNameQuoting())

    report_fatal_error("Symbol name with unsupported characters");

  OS << '"';

  for (char C : Name) {

    if (C == '\n')

      OS << "\\n";

    else if (C == '"')

      OS << "\\\"";

    else

      OS << C;

  }

  OS << '"';

}

#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)

LLVM_DUMP_METHOD void MCSymbol::dump() const { }

#endif