/*

  This file is part of solidity.

  solidity is free software: you can redistribute it and/or modify

  it under the terms of the GNU General Public License as published by

  the Free Software Foundation, either version 3 of the License, or

  (at your option) any later version.

  solidity is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License

  along with solidity.  If not, see <http://www.gnu.org/licenses/>.

*/

// SPDX-License-Identifier: GPL-3.0

/**

 * Adaptor between AbstractAssembly and libevmasm.

 */

#include <libyul/backends/evm/EthAssemblyAdapter.h>

#include <libyul/backends/evm/AbstractAssembly.h>

#include <libyul/Exceptions.h>

#include <libevmasm/Assembly.h>

#include <libevmasm/AssemblyItem.h>

#include <libevmasm/Instruction.h>

#include <liblangutil/SourceLocation.h>

#include <memory>

#include <functional>

using namespace std;

using namespace solidity;

using namespace solidity::yul;

using namespace solidity::util;

using namespace solidity::langutil;

EthAssemblyAdapter::EthAssemblyAdapter(evmasm::Assembly& _assembly):

  m_assembly(_assembly)

{

}

void EthAssemblyAdapter::setSourceLocation(SourceLocation const& _location)

{

  m_assembly.setSourceLocation(_location);

}

int EthAssemblyAdapter::stackHeight() const

{

  return m_assembly.deposit();

}

void EthAssemblyAdapter::setStackHeight(int height)

{

  m_assembly.setDeposit(height);

}

void EthAssemblyAdapter::appendInstruction(evmasm::Instruction _instruction)

{

  m_assembly.append(_instruction);

}

void EthAssemblyAdapter::appendConstant(u256 const& _constant)

{

  m_assembly.append(_constant);

}

void EthAssemblyAdapter::appendLabel(LabelID _labelId)

{

  m_assembly.append(evmasm::AssemblyItem(evmasm::Tag, _labelId));

}

void EthAssemblyAdapter::appendLabelReference(LabelID _labelId)

{

  m_assembly.append(evmasm::AssemblyItem(evmasm::PushTag, _labelId));

}

size_t EthAssemblyAdapter::newLabelId()

{

  return assemblyTagToIdentifier(m_assembly.newTag());

}

size_t EthAssemblyAdapter::namedLabel(std::string const& _name, size_t _params, size_t _returns, std::optional<size_t> _sourceID)

{

  return assemblyTagToIdentifier(m_assembly.namedTag(_name, _params, _returns, _sourceID));

}

void EthAssemblyAdapter::appendLinkerSymbol(std::string const& _linkerSymbol)

{

  m_assembly.appendLibraryAddress(_linkerSymbol);

}

void EthAssemblyAdapter::appendVerbatim(bytes _data, size_t _arguments, size_t _returnVariables)

{

  m_assembly.appendVerbatim(move(_data), _arguments, _returnVariables);

}

void EthAssemblyAdapter::appendJump(int _stackDiffAfter, JumpType _jumpType)

{

  appendJumpInstruction(evmasm::Instruction::JUMP, _jumpType);

  m_assembly.adjustDeposit(_stackDiffAfter);

}

void EthAssemblyAdapter::appendJumpTo(LabelID _labelId, int _stackDiffAfter, JumpType _jumpType)

{

  appendLabelReference(_labelId);

  appendJump(_stackDiffAfter, _jumpType);

}

void EthAssemblyAdapter::appendJumpToIf(LabelID _labelId, JumpType _jumpType)

{

  appendLabelReference(_labelId);

  appendJumpInstruction(evmasm::Instruction::JUMPI, _jumpType);

}

void EthAssemblyAdapter::appendAssemblySize()

{

  m_assembly.appendProgramSize();

}

pair<shared_ptr<AbstractAssembly>, AbstractAssembly::SubID> EthAssemblyAdapter::createSubAssembly(bool _creation, string _name)

{

  shared_ptr<evmasm::Assembly> assembly{make_shared<evmasm::Assembly>(_creation, std::move(_name))};

  auto sub = m_assembly.newSub(assembly);

  return {make_shared<EthAssemblyAdapter>(*assembly), static_cast<size_t>(sub.data())};

}

void EthAssemblyAdapter::appendDataOffset(vector<AbstractAssembly::SubID> const& _subPath)

{

  if (auto it = m_dataHashBySubId.find(_subPath[0]); it != m_dataHashBySubId.end())

  {

    yulAssert(_subPath.size() == 1, "");

    m_assembly << evmasm::AssemblyItem(evmasm::PushData, it->second);

    return;

  }

  m_assembly.pushSubroutineOffset(m_assembly.encodeSubPath(_subPath));

}

void EthAssemblyAdapter::appendDataSize(vector<AbstractAssembly::SubID> const& _subPath)

{

  if (auto it = m_dataHashBySubId.find(_subPath[0]); it != m_dataHashBySubId.end())

  {

    yulAssert(_subPath.size() == 1, "");

    m_assembly << u256(m_assembly.data(h256(it->second)).size());

    return;

  }

  m_assembly.pushSubroutineSize(m_assembly.encodeSubPath(_subPath));

}

AbstractAssembly::SubID EthAssemblyAdapter::appendData(bytes const& _data)

{

  evmasm::AssemblyItem pushData = m_assembly.newData(_data);

  SubID subID = m_nextDataCounter++;

  m_dataHashBySubId[subID] = pushData.data();

  return subID;

}

void EthAssemblyAdapter::appendToAuxiliaryData(bytes const& _data)

{

  m_assembly.appendToAuxiliaryData(_data);

}

void EthAssemblyAdapter::appendImmutable(std::string const& _identifier)

{

  m_assembly.appendImmutable(_identifier);

}

void EthAssemblyAdapter::appendImmutableAssignment(std::string const& _identifier)

{

  m_assembly.appendImmutableAssignment(_identifier);

}

void EthAssemblyAdapter::markAsInvalid()

{

  m_assembly.markAsInvalid();

}

EthAssemblyAdapter::LabelID EthAssemblyAdapter::assemblyTagToIdentifier(evmasm::AssemblyItem const& _tag)

{

  u256 id = _tag.data();

  yulAssert(id <= std::numeric_limits<LabelID>::max(), "Tag id too large.");

  return LabelID(id);

}

void EthAssemblyAdapter::appendJumpInstruction(evmasm::Instruction _instruction, JumpType _jumpType)

{

  yulAssert(_instruction == evmasm::Instruction::JUMP || _instruction == evmasm::Instruction::JUMPI, "");

  evmasm::AssemblyItem jump(_instruction);

  switch (_jumpType)

  {

  case JumpType::Ordinary:

    yulAssert(jump.getJumpType() == evmasm::AssemblyItem::JumpType::Ordinary, "");

    break;

  case JumpType::IntoFunction:

    jump.setJumpType(evmasm::AssemblyItem::JumpType::IntoFunction);

    break;

  case JumpType::OutOfFunction:

    jump.setJumpType(evmasm::AssemblyItem::JumpType::OutOfFunction);

    break;

  }

  m_assembly.append(std::move(jump));

}